AP2181 (Diodes)
1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH
Description
The AP2181 and AP2191 are integrated high-side power switches
optimized for Universal Serial Bus (USB) and other hot-swap
applications. The family of devices complies with USB 2.0 and is
available with both polarities of Enable input. They offer current and
thermal limiting and short circuit protection as well as controlled rise
time and under-voltage lockout functionality. A 7ms deglitch capability
on the open-drain Flag output prevents false over-current reporting
and does not require any external components.
All devices are available in SO-8, MSOP-8EP, SOT25 and
U-DFN2018-6 packages.
Pin Assignments
GND 1
( Top View )
8 NC
IN 2
7 OUT
IN 3
6 OUT
EN 4
SO-8
5 FLG
Features
Single USB Port Power Switches
Over-Current and Thermal Protection
2.1A Accurate Current Limiting
Reverse Current Blocking
95mOn-Resistance
Input Voltage Range: 2.7V – 5.5V
0.6ms Typical Rise Time
Very Low Shutdown Current: 1µA (max)
Fault Report (FLG) with Blanking Time (7ms typ)
ESD Protection: 4kV HBM, 300V MM
Active Low (AP2181) or Active High (AP2191) Enable
Ambient Temperature Range: -40°C to +85°C
SOT25, SO-8, MSOP-8EP (Exposed Pad), and U-DFN2018-6:
Available in “Green” Molding Compound (No Br, Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
UL Recognized, File Number E322375
IEC60950-1 CB Scheme Certified
Applications
Consumer Electronics – LCD TVs & Monitors, Game Machines
Communications – Set-Top-Boxes, GPS Systems,
Smartphones
Computing – Laptops, Desktops, Servers, Printers, Docking
Stations, HUBs
( Top View )
GND 1
6 OUT
IN 2
5 OUT
EN 3
4 FLG
U-DFN2018-6
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AP2181/ AP2191
Document number: DS31563 Rev. 8 - 2
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AP2181 (Diodes)
1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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Typical Applications Circuit
AP2191 Enable Active High
Power Supply
2.7V to 5.5V
IN OUT
10k 10uF 0.1uF
ON
OFF
FLG
EN GND
AP2181/ AP2191
Load
0.1uF
120uF
Available Options
Part Number
AP2181
AP2191
Channel
1
1
Enable Pin (EN)
Active Low
Active High
Current Limit
(typ)
2.1A
2.1A
Recommended Maximum Continuous
Load Current
1.5A
1.5A
Pin Descriptions
Pin
Name
GND
IN
EN
FLG
OUT
NC
SO-8
1
2, 3
4
5
6, 7
8
Exposed tab
-
Pin Number
MSOP-8EP SOT25
12
2, 3 5
44
53
6, 7 1
8 N/A
Exposed tab
-
U-DFN2018-6
Function
1 Ground
2 Voltage input pin (all IN pins must be tied together externally)
3 Enable input, active low (AP2181) or active high (AP2191)
4
Over-current and over-temperature fault report.
Open-drain flag is active low when triggered
5, 6 Voltage output pin (all OUT pins must be tied together externally)
N/A
No internal connection.
Recommend tie to OUT pins
Exposed pad.
Exposed tab It should be connected to GND and thermal mass for enhanced thermal
impedance. It should not be used as electrical ground conduction path.
AP2181/ AP2191
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AP2181 (Diodes)
1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
Functional Block Diagram
IN
UVLO
EN
AP2181, AP2191
Current
Sense
Driver
Current
Limit
Thermal
Sense
Deglitch
OUT
FLG
GND
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD MM
VIN
VOUT
VEN , VFLG
ILOAD
TJ(MAX)
TST
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
for MSOP-8EP, SOT25 Packages
Machine Model ESD Protection
for U-DFN2018-6, SO-8 Packages
Input Voltage
Output Voltage
Enable Voltage
Maximum Continuous Load Current
Maximum Junction Temperature
Storage Temperature Range (Note 4)
Ratings
4
400
300
6.5
VIN +0.3
6.5
Internal Limited
+150
-65 to +150
Units
kV
V
V
V
V
V
A
°C
°C
Caution:
Note:
Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling
and transporting these devices
4. UL Recognized Rating from -30°C to +70°C (Diodes qualified TST from -65°C to +150°C).
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VIN
IOUT
TA
VIH
VIL
Input Voltage
Parameter
Output Current
Operating Ambient Temperature
High-Level Input Voltage on EN or EN
Low-Level Input Voltage on EN or EN
Min
2.7
0
-40
2.0
0
Max
5.5
1.5
+85
VIN
0.8
Units
V
A
°C
V
V
AP2181/ AP2191
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AP2181 (Diodes)
1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
Electrical Characteristics (@TA = +25°C, VIN = +5V, unless otherwise specified.)
Symbol
Parameter
VUVLO Input UVLO
ISHDN Input Shutdown Current
IQ Input Quiescent Current
ILEAK Input Leakage Current
IREV Reverse Leakage Current
RDS(ON) Switch On-Resistance
ISHORT
ILIMIT
ITrig
VIL
VIH
ISINK
TD(ON)
TR
TD(OFF)
TF
RFLG
TBlank
TSHDN
THYS
Short-Circuit Current Limit
Over-Load Current Limit
Current Limiting Trigger Threshold
EN Input Logic Low Voltage
EN Input Logic High Voltage
EN Input Leakage
Output Turn-On Delay Time
Output Turn-On Rise Time
Output Turn-Off Delay Time
Output Turn-Off Fall Time
FLG Output FET On-Resistance
FLG Blanking Time
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
θJA
Thermal Resistance Junction-to-
Ambient
Test Conditions
RLOAD = 1k
Disabled, IOUT = 0
Enabled, IOUT = 0
Disabled, OUT grounded
Disabled, VIN = 0V, VOUT = 5V, IREV at VIN
VIN = 5V,
IOUT= 1.5A
SOT25, MSOP-8EP, SO-8
TA = +25°C U-DFN2018-6
-40°C TA +85°C
VIN = 3.3V,
IOUT= 1.5A
TA = +25°C
-40°C TA +85°C
Enabled into short circuit, CL = 100µF
VIN = 5V, VOUT = 4.5V, CL = 120µF, -40°C TA +85°C
Output Current Slew Rate (<100A/s) , CL = 100µF
VIN = 2.7V to 5.5V
VIN = 2.7V to 5.5V
VEN = 5V
CL = 1µF, RLOAD = 10
CL = 1µF, RLOAD = 10
CL = 1µF, RLOAD = 10
CL = 1µF, RLOAD = 10
IFLG = 10mA, CL = 100µF
CIN = 10µF, CL = 100µF
Enabled, RLOAD = 1k
SO-8 (Note 5)
MSOP-8EP (Note 6)
SOT25 (Note 7)
U-DFN2018-6 (Note 8)
Min Typ Max Unit
1.6 1.9 2.5
V
— 0.5 1 µA
— 45 70 µA
— — 1 µA
— 1 — µA
— 95 115
— 90 110
— — 140 m
— 120 140
— — 170
— 2.0 —
A
1.6 2.1 2.6
A
— 2.6 —
A
— — 0.8 V
2 —— V
— — 1 µA
— 0.05 —
ms
— 0.6 1.5 ms
— 0.01 —
ms
— 0.05 0.1 ms
— 20 40
4 7 15 ms
— +140 —
°C
— +25 —
°C
— 110 — °C/W
— 60 — °C/W
— 157 — °C/W
— 70 — °C/W
Notes:
5. Test condition for SO-8: Device mounted on FR-4, 2oz copper, with minimum recommended pad layout.
6. Test condition for MSOP-8EP: Device mounted on 2” x 2” FR-4 substrate PC board, 2oz copper, with minimum recommended pad on top layer and
thermal vias to bottom layer ground plane.
7. Test condition for SOT25: Device mounted on FR-4, 2oz copper, with minimum recommended pad layout.
8. Test condition for U-DFN2018-6: Device mounted on FR-4 2-layer board, 2oz copper, with minimum recommended pad on top layer and 3 vias to bottom
layer 1.0”x1.4” ground plane.
AP2181/ AP2191
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AP2181 (Diodes)
1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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Typical Performance Characteristics
AP2181/ AP2191
VEN
VOUT
50%
50%
VEN
50%
50%
TR
TD(ON)
90%
10%
TD(OFF)
TF
90%
10%
VOUT
TR
TD(ON)
90%
10%
TD(OFF)
TF
90%
10%
Figure 1 Voltage Waveforms: AP2181 (left), AP2191 (right)
All Enable Plots are for AP2191 Active High
Turn-On Delay and Rise Time
Turn-Off Delay and Fall Time
Ven
5V/div
Vout
2V/div
Ven
5V/div
400µs/div
CL = 1µF
TA = +25°C
RL = 5
Vout
2V/div
Turn-On Delay and Rise Time
CL = 1µF
TA = +25°C
RL = 5
400µs/div
Turn-Off Delay and Fall Time
Ven
5V/div
Vout
2V/div
400µs/div
Ven
5V/div
CL = 100µF
TA = +25°C
RL = 5
Vout
2V/div
400µs/div
CL = 100µF
TA = +25°C
RL = 5
AP2181/ AP2191
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AP2181 (Diodes)
1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
Typical Performance Characteristics (continued)
Short Circuit Current,
Device Enabled Into Short
Ven
5V/div
Ven
5V/div
CL = 100uF
Inrush Current
CL = 470uF
VIN = 5V
TA = +25°C
RL = 3.3
Iout
500mA/div
VIN = 5V
TA = +25°C
CL = 100µF
500µs/div
Vflag
2V/div
0.6 Load Connected to Enabled Device
VIN = 5V
TA = +25°C
CL = 100µF
Iout
1A/div
Vflag
5V/div
Iout
500mA/div
Ven
5V/div
Vin
5V/div
2ms/div
Power On
TA = +25°C
CL = 68µF
RL = 3.3
1ms/div
Iout
500mA/div
CL = 220uF
1ms/div
Short Circuit with Blanking Time and Recovery
Vout
5V/div
VIN = 5V
TA = +25°C
CL = 100µF
Vflag
5V/div
Iout
2A/div
20ms/div
UVLO Increasing
Vin
2V/div
Iout
500mA/div
1ms/div
TA = +25°C
CL = 68µF
RL = 3.3
AP2181/ AP2191
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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Typical Performance Characteristics (cont.)
UVLO Decreasing
Vin
2V/div
TA = +25°C
CL = 68µF
RL = 3.3
Iout
500mA/div
10ms/div
Turn-On Time vs Input Voltage
850
750
650
550
450
CL = 1µF
350 RL =10
TA = +25°C
250
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Input Voltage (V)
Rise Time vs Input Voltage
650
600
550
500
450
CL = 1µF
400
RL = 10
350 TA = +25°C
300
2 2.5 3 3.5 4 4.5 5 5.5 6
Input Voltage (V)
AP2181/ AP2191
45
40
35
30
25
20
15
10
5
0
0
Current Limit Response vs Peak Current
VIN = 5V
TA = +25°C
2 4 6 8 10 12
Peak Current (A)
Turn-Off Time vs Input Voltage
55
50 CL = 1µF
RL = 10
45
TA = +25°C
40
35
30
25
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Input Voltage (V)
Fall Time vs Input Voltage
25
24
23
22
21 CL = 1µF
RL = 10
20 TA = +25°C
19
2 2.5 3 3.5 4 4.5 5 5.5 6
Input Voltage (V)
AP2181/ AP2191
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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Typical Performance Characteristics (cont.)
Supply Current, Output Enabled vs Ambient Temperature
52
Vin = 5.0V
47
Vin = 5.5V
42
37
Vin = 2.7V
32
Vin = 3.3V
27
-60 -40 -20 0 20 40 60
Ambient Temperature (°C)
80 100
Static Drain-Source On-State Resistance vs Ambient
Temperature
180
170
160
150
140
130
120
110
100
90
80
-60
Vin = 2.7V
Vin = 3.3V
Vin = 5V
-40 -20 0 20 40 60
Ambient Temperature (°C)
80
100
Undervoltage Lockout vs Ambient Temperature
2.15
2.10
UVLO Rising
2.05
2.00
UVLO Falling
1.95
1.90
-60 -40 -20 0 20 40 60 80 100
Ambient Temperature (°C)
AP2181/ AP2191
Supply Current, Output Disabled vs Ambient Temperature
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-60
Vin = 5.5V
Vin = 5.0V
Vin = 3.3V
Vin = 2.7V
-40 -20
0
20 40 60
Ambient Temperature (°C)
80
100
Short-Circuit Output Current vs Ambient Temperature
2.60
CL = 100uF
2.50
Vin = 2.7V
2.40
Vin = 3.3V
Vin = 5.0V
2.30
2.20
2.10
Vin = 5.5V
2.00
-60 -40 -20 0 20 40 60 80 100
Ambient Temperature (°C)
3.24
3.22
3.20
3.18
3.16
3.14
3.12
3.10
3.08
2.8
Threshold Trip Current vs Input Voltage
TA = +25°C
CL = 68µF
3.3 3.8 4.3 4.8 5.3
Input Voltage (V)
AP2181/ AP2191
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
Application Information
Power Supply Considerations
A 0.01-µF to 0.1-µF X7R or X5R ceramic bypass capacitor between IN and GND, close to the device, is recommended. Placing a high-value
electrolytic capacitor on the input (10-µF minimum) and output pin(s) is recommended when the output load is heavy. This precaution reduces
power-supply transients that may cause ringing on the input. Additionally, bypassing the output with a 0.01-µF to 0.1-µF ceramic capacitor improves
the immunity of the device to short-circuit transients.
Over-Current and Short Circuit Protection
An internal sensing FET is employed to check for over-current conditions. Unlike current-sense resistors, sense FETs do not increase the series
resistance of the current path. When an overcurrent condition is detected, the device maintains a constant output current and reduces the output
voltage accordingly. Complete shutdown occurs only if the fault stays long enough to activate thermal limiting.
Three possible overload conditions can occur. In the first condition, the output has been shorted to GND before the device is enabled or before VIN
has been applied. The AP2181/AP2191 senses the short circuit and immediately clamps output current to a certain safe level namely ILIMIT.
In the second condition, an output short or an overload occurs while the device is enabled. At the instance the overload occurs, higher current may
flow for a very short period of time before the current limit function can react. After the current limit function has tripped (reached the over-current
trip threshold), the device switches into current limiting mode and the current is clamped at ILIMIT.
In the third condition, the load has been gradually increased beyond the recommended operating current. The current is permitted to rise until the
current-limit threshold (ITRIG) is reached or until the thermal limit of the device is exceeded. The AP2181/AP2191 is capable of delivering current up
to the current-limit threshold without damaging the device. Once the threshold has been reached, the device switches into its current limiting mode
and is set at ILIMIT.
Note that when the output has been shorted to GND at extremely low temperature (< -30°C), a minimum 120-µF electrolytic capacitor on the output
pin is recommended. A correct capacitor type with capacitor voltage rating and temperature characteristics must be properly chosen so that
capacitance value does not drop too low at the extremely low temperature operation. A recommended capacitor should have temperature
characteristics of less than 10% variation of capacitance change when operated at extremely low temp. Our recommended aluminum electrolytic
capacitor type is Panasonic FC series.
FLG Response
When an over-current or over-temperature shutdown condition is encountered, the FLG open-drain output goes active low after a nominal 7-ms
deglitch timeout. The FLG output remains low until both over-current and over-temperature conditions are removed. Connecting a heavy capacitive
load to the output of the device can cause a momentary over-current condition, which does not trigger the FLG due to the 7-ms deglitch timeout.
The AP2181/AP2191 is designed to eliminate false over-current reporting without the need of external components to remove unwanted pulses.
Power Dissipation and Junction Temperature
The low on-resistance of the internal MOSFET allows the small surface-mount packages to pass large current. Using the maximum operating
ambient temperature (TA) and RDS(ON), the power dissipation can be calculated by:
PD = RDS(ON)× I2
Finally, calculate the junction temperature:
TJ = PD x RθJA + TA
Where:
TA = Ambient temperature °C
RθJA = Thermal resistance
PD = Total power dissipation
Thermal Protection
Thermal protection prevents the IC from damage when heavy-overload or short-circuit faults are present for extended periods of time. The
AP2181/AP2191 implements a thermal sensing to monitor the operating junction temperature of the power distribution switch. Once the die
temperature rises to approximately 140°C due to excessive power dissipation in an over-current or short-circuit condition the internal thermal sense
circuitry turns the power switch off, thus preventing the power switch from damage. Hysteresis is built into the thermal sense circuit allowing the
device to cool down approximately 25°C before the switch turns back on. The switch continues to cycle in this manner until the load fault or input
power is removed. The FLG open-drain output is asserted when an over-temperature shutdown or over-current occurs with 7-ms deglitch.
AP2181/ AP2191
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
Application Information (continued)
Under-Voltage Lockout (UVLO)
The under-voltage lockout function (UVLO) keeps the internal power switch from being turned on until the power supply has reached at least 1.9V,
even if the switch is enabled. Whenever the input voltage falls below approximately 1.9V, the power switch is quickly turned off. This facilitates the
design of hot-insertion systems where it is not possible to turn off the power switch before input power is removed.
Host/Self-Powered HUBs
Hosts and self-powered hubs (SPH) have a local power supply that powers the embedded functions and the downstream ports (see Figure 2). This
power supply must provide from 5.25V to 4.75V to the board side of the downstream connection under both full-load and no-load conditions. Hosts
and SPHs are required to have current-limit protection and must report over-current conditions to the USB controller. Typical SPHs are desktop
PCs, monitors, printers, and stand-alone hubs.
Figure 2 Typical One-Port USB Host / Self-Powered Hub
Generic Hot-Plug Applications
In many applications it may be necessary to remove modules or pc boards while the main unit is still operating. These are considered hot-plug
applications. Such implementations require the control of current surges seen by the main power supply and the card being inserted. The most
effective way to control these surges is to limit and slowly ramp the current and voltage being applied to the card, similar to the way in which a
power supply normally turns on. Due to the controlled rise times and fall times of the AP2181/AP2191, these devices can be used to provide a
softer start-up to devices being hot-plugged into a powered system. The UVLO feature of the AP2181/AP2191 also ensures that the switch is off
after the card has been removed, and that the switch is off during the next insertion.
By placing the AP2181/AP2191 between the VCC input and the rest of the circuitry, the input power reaches these devices first after insertion. The
typical rise time of the switch is approximately 1ms, providing a slow voltage ramp at the output of the device. This implementation controls system
surge current and provides a hot-plugging mechanism for any device.
Dual-Purpose Port Applications
AP2181/AP2191 is not recommended for use in dual-purpose port applications in which a single port is used for data communication between the
host and peripheral devices while simultaneously maintaining a charge to the battery of the peripheral device. An example of a non-recommended
application is a shared HDMI/MHL (Mobile High-definition Link) port that allows streaming video between an HDTV or set-top box and a
smartphone or tablet while maintaining a charge to the smartphone or tablet battery. If a voltage is maintained across the output of the
AP2181/AP2191 when the output is disabled and the Vin of the device is subsequently ramped up, an overstress condition to the AP2181/AP2191
may result.
AP2181/ AP2191
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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Ordering Information
AP2181/ AP2191
Part Number
AP21X1WG-7
AP21X1SG-13
AP21X1MPG-13
AP21X1FMG-7
Package Code
W
S
MP
FM
Packaging
SOT25
SO-8
MSOP-8EP
U-DFN2018-6
7”/13” Tape and Reel
Quantity
Part Number Suffix
3,000/Tape & Reel
-7
2,500/Tape & Reel
-13
2,500/Tape & Reel
-13
3,000/Tape & Reel
-7
Marking Information
(1) SO-8
(2) MSOP-8EP
Logo
Part Number
8 : Active Low
9 : Active High
( Top view )
8765
AP21X X
YY WW X X
1 234
1 : 1 Channel
G : Green
YY : Year : 08, 09,10~
WW : Week : 01~52; 52
represents 52 and 53 week
X : Internal Code
Logo
Part Number
8 : Active Low
9 : Active High
( Top view )
87 65
YWXE
AP21X X
12 34
A~Z : Green
MSOP-8L-EP
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
1 : 1 Channel
AP2181/ AP2191
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
Marking Information (continued)
(3) SOT25
( Top View )
54
XX Y W X
123
XX : Identification code
Y : Year 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Device
AP2181W
AP2191W
Package type
SOT25
SOT25
Identification Code
HX
HY
(4) U-DFN2018-6
Device
AP2181FM
AP2191FM
Package type
U-DFN2018-6
U-DFN2018-6
Identification Code
HX
HY
AP2181/ AP2191
Document number: DS31563 Rev. 8 - 2
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AP2181 (Diodes)
1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version.
(1) Package Type: SO-8
AP2181/ AP2191
e
D
b
E1 E
A1
L
Detail ‘A’
Gauge Plane
Seating Plane
A2 A A3
h
45°
7°~9°
Detail ‘A’
(2) Package Type: MSOP-8EP
D
x
y
1e
A1
A
D
E E2
8Xb
A3
A2
D1 4X10°
Gauge Plane
Seating Plane
4X10°
L
E3 Detail C
c
E1
See Detail C
SO-8
Dim Min Max
A - 1.75
A1 0.10 0.20
A2 1.30 1.50
A3 0.15 0.25
b 0.3 0.5
D 4.85 4.95
E 5.90 6.10
E1 3.85 3.95
e 1.27 Typ
h - 0.35
L 0.62 0.82
θ 0° 8°
All Dimensions in mm
MSOP-8EP
Dim Min Max Typ
A - 1.10 -
A1 0.05 0.15 0.10
A2 0.75 0.95 0.86
A3 0.29 0.49 0.39
b 0.22 0.38 0.30
c 0.08 0.23 0.15
D 2.90 3.10 3.00
D1 1.60 2.00 1.80
E 4.70 5.10 4.90
E1 2.90 3.10 3.00
E2 1.30 1.70 1.50
E3 2.85 3.05 2.95
e - - 0.65
L 0.40 0.80 0.60
a 0° 8° 4°
x - - 0.750
y - - 0.750
All Dimensions in mm
AP2181/ AP2191
Document number: DS31563 Rev. 8 - 2
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version.
(3) Package Type: SOT25
A
BC
H
K
N
JDL
M
SOT25
Dim Min Max Typ
A 0.35 0.50 0.38
B 1.50 1.70 1.60
C 2.70 3.00 2.80
D   0.95
H 2.90 3.10 3.00
J 0.013 0.10 0.05
K 1.00 1.30 1.10
L 0.35 0.55 0.40
M 0.10 0.20 0.15
N 0.70 0.80 0.75
α 0° 8°
All Dimensions in mm
(4) Package Type: U-DFN2018-6
A
A1
Pin#1 ID
D
D2
A3
SEATING PLANE
L
E E2
z
eb
U-DFN2018-6
Dim Min Max Typ
A 0.545 0.605 0.575
A1 0 0.05 0.02
A3   0.13
b 0.15 0.25 0.20
D 1.750 1.875 1.80
D2 1.30 1.50 1.40
e   0.50
E 1.95 2.075 2.00
E2 0.90 1.10 1.00
L 0.20 0.30 0.25
z   0.30
All Dimensions in mm
AP2181/ AP2191
Document number: DS31563 Rev. 8 - 2
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
(1) Package Type: SO-8
X
C2
Y
C1
Dimensions
X
Y
C1
C2
Value (in mm)
0.60
1.55
5.4
1.27
(2) Package Type: MSOP-8EP
X
C
GY
Y2
X1
Y1
Dimensions
C
G
X
X1
Y
Y1
Y2
Value
(in mm)
0.650
0.450
0.450
2.000
1.350
1.700
5.300
(3) Package Type: SOT25
C2 C2
ZG
Y
X
C1
Dimensions
Z
G
X
Y
C1
C2
Value (in mm)
3.20
1.60
0.55
0.80
2.40
0.95
AP2181/ AP2191
Document number: DS31563 Rev. 8 - 2
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AP2181/ AP2191
Suggested Pad Layout (continued)
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
(4) Package Type: U-DFN2018-6
X
C
Y
Dimensions Value (in mm)
C 0.50
G 0.20
Y1 X 0.25
X1 1.60
Y 0.35
G Y1 1.20
Taping Orientation
For U-DFN2018-6
X1
Notes: 9. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf.
AP2181/ AP2191
Document number: DS31563 Rev. 8 - 2
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1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

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AP2181/ AP2191
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2015, Diodes Incorporated
www.diodes.com
AP2181/ AP2191
Document number: DS31563 Rev. 8 - 2
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AP2181.pdf
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