AH920 (Diodes)
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Description
The AH920 is a Hall-effect latch designed in mixed signal CMOS
technology. It is quite suitable for use in automotive, industrial and
consumer applications.
Superior high-temperature performance is made possible through
dynamic offset cancellation, which reduces the residual offset voltage
normally caused by device over-molding, temperature dependencies,
and thermal stress. The device integrates a voltage regulator, Hall-
voltage generator, small-signal amplifier, chopper stabilization, schmitt
trigger, and open-drain output.
An on-board regulator permits operation with supply voltage from
3.5V to 20V.
The AH920 is available in TO-92S-3 and SOT-23-3 packages, which
are optimized for most applications.
AH920
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
Pin Assignments
(Front View)
3 OUT
2 GND
1 VCC
TO-92S-3 (Z3 Package)
(Top View)
GND
3
Features
Wide Operating Voltage Range from 3.5V to 20V
Symmetrical Switch Points
Chopper-stabilized Amplifier Stage
Superior Temperature Stability
Open-drain Output
Compact Size
ESD Rating: 6000V (Human Body Model)
Typical Applications Circuit
VCC1
RL
Output
CL
0.1mF
VCC2
1
VCC
2
OUT
SOT-23-3 (N Package)
Applications
Brushless DC Motor Commutation
Brushless DC Fan
Solid-state Switch
Revolution Counting
Speed Detection
High Sensitivity and Unconnected Switch
Output
RL
VCC
CL
0.1mF
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Pin Descriptions
Pin Number
TO-92S-3
SOT-23-3
11
23
32
A Product Line of
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AH920
Pin Name
VCC
GND
OUT
Supply voltage
Ground pin
Output Pin
Function
Functional Block Diagram
VCC
1 (1)
Reference Voltage
Hall Sense
Chopper
Switch
AMP
A (B)
A for TO-92S-3
B for SOT-23-3
2 (3)
GND
OUT
3 (2)
AH920
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AH920 (Diodes)
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Absolute Maximum Ratings (Note 1)
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AH920
Symbol
VCC
ICC
IOUT
PD
TA
TSTG
TJ (Max)
ESD
Parameter
Supply Voltage
Supply Current (Fault)
Output Current (Continuous)
Power Dissipation
Operation Temperature
Storage Temperature
Maximum Junction Temperature
ESD (Human Body Model)
Value
20
5
25
TO-92S-3
400
SOT-23-3
230
-50 to +150
-65 to +150
+165
6000
Unit
V
mA
mA
mW
ºC
ºC
ºC
V
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
VCC
TA
Parameter
Supply Voltage
Operating Ambient Temperature
Min
Max
Unit
3.5 20 V
-40
+125
ºC
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Electrical Characteristics (@VCC =12V, TA =+25°C, unless otherwise specified.)
AH920
Symbol
VCC
ICC
VSAT
ILEAKAGE
tRISING
tFALLING
Parameter
Supply Voltage
Supply Current
Saturation Voltage
Output Leakage Current
Output Rising Time
Output Falling Time
Conditions
Operating
VCC=12V, B<BRP
VCC=12V, B>BOP
IOUT=20mA, B>BOP
VOUT=20V, B<BRP
RL=1kΩ,CL=20pF
RL=1kΩ,CL=20pF
Min Typ Max Unit
3.5 12 20 V
3.0 5.0 mA
3.0 5.0 mA
185 500 mV
0.1 10 μA
0.4 2 μs
0.4 2 μs
Magnetic Characteristics (@VCC=12V, TA=+25°C, unless otherwise specified.)
Symbol
BOP
BRP
BHYS
Parameter
Operating Point
Releasing Point
Hysteresis
Min
5
-40
Typ
22
-22
45
Max
40
-5
High
VOUT
VCC
Vd
BHYS
VSAT BRP
N
0
BOP
S
Low
For TO-92S-3
VOUT
VCC
Vd High
BHYS
Low
BRP
BOP
VSAT
N 0S
For SOT-23-3
Unit
Gauss
Gauss
Gauss
Figure 1. Magnetic Flux Density of AH920
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Magnetic Characteristics (Cont.)
South Pole
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AH920
North Pole
Output=Low (For TO-92S-3)
South Pole
Output=High (For TO-92S-3)
North Pole
Output=High (For SOT-23-3)
Output=Low (For SOT-23-3)
Figure 2. Output Status vs. Magnetic Pole
Package Type
TO-92S-3
SOT-23-3
Parameter
South Pole
North Pole
South Pole
North Pole
Test Condition
BBOP
BBRP
BBOP
BBRP
Table 1. Output Status vs. Magnetic Pole
Output
Low
High
High
Low
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Magnetic Characteristics (Cont.)
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AH920
10k
AH920
DC
GND
V
Figure 3. Magnetic Thresholds
Note 2: BOP is determined by putting the device under magnetic field swept from BRP (Min) to BOP (Max) until the output is switched on.
Note 3: BRP is determined by putting the device under magnetic field swept from BOP (Max) to BRP (Min) until the output is switched off.
Test Circuit and Test Conditions
VCC1
RL
Output
AH920
Document number: DS36768 Rev. 2 - 2
CL
20pF
VCC2
Figure 4. Test Circuit of AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Test Circuit and Test Conditions (Cont.)
A Product Line of
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AH920
ICC
A
DC
AH920
GND
Output
Figure 5. Test Condition of AH920 (Supply Current)
Note 4: Output initial status is low when powering on.
Note 5: The supply current ICC represents the average supply current. The output is open during measurement.
Note 6: The device is put under the magnetic field: B<BRP.
DC
3.5/20V
AH920
Output
GND
20mA
V VSAT
Figure 6. Test Condition of AH920 (Output Saturation Voltage)
Note 7: The output saturation voltage VSAT is measured at VCC=3.5V and VCC=20V.
Note 8: The device is put under the magnetic field: B>BOP.
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Test Circuit and Test Conditions (Cont.)
A Product Line of
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AH920
AH920
IOFF
A
DC
12V
GND
DC
20V
Figure 7. Test Condition of AH920 (Output Leakage Current)
Note 9: The device is put under the magnetic field: B<BRP.
Typical Performance Characteristics
ICC vs. VCC
4.0
3.5
3.0
2.5
2.0
1.5
1.0 T =25OC
A
4 6 8 10 12 14 16 18 20
V (V)
CC
ICC vs. TA
4.0 V =5V
CC
V =12V
CC
3.5
3.0
2.5
2.0
1.5
-25 0 25 50 75 100 125
T (OC)
A
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Typical Performance Characteristics (Cont.)
50
40
30
20
10
0
-10
-20
5
BOP/BRP/BHYS vs. VCC
B
OP
B
RP
B
HYS
T =25OC
A
10 15
V (V)
CC
20
180
160
140
120
100
80
60
40
20
0
0
VSAT vs. IOUT
T =25OC
A
V =12V
CC
5 10 15 20 25
I (mA)
OUT
A Product Line of
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AH920
40
30
20
10
0
-10
-20
-25
BOP/BRP/BHYS vs. TA
B
OP
B
RP
B
HYS
V =12V
CC
0 25 50 75 100 125
T (OC)
A
240
220
200
180
160
140
120
100
-25
VSAT vs. TA
V =5V
CC
V =12V
CC
0 25 50 75 100 125
T (OC)
A
450
400
350
300
250
200
150
100
50
0
0
PD vs. TA
SOT-23-3
TO-92S-3
25 50 75 100 125 150
T (OC)
A
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Ordering Information
A Product Line of
Diodes Incorporated
AH920
AH920 XX XX - XX
Product Name
Package
Z3 : TO-92S-3
N : SOT-23-3
Packing
TR : Tape & Reel
Blank : Bulk
RoHS/Green
G1 : Green
Package
TO-92S-3
SOT-23-3
Temperature Range
-40 to 125°C
-40 to 125°C
Part Number
AH920Z3-G1
AH920NTR-G1
Marking ID
920
GS7
Packing Type
Bulk
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Package Outline Dimensions (All dimensions in mm(inch).)
(1) Package Type: TO-92S-3
440.750(0.030)
46TYP
1.420(0.056)
1.620(0.064)
1.850(0.073)
2.150(0.085)
Package Sensor Location
0.380(0.015)
0.550(0.022)
3.850(0.152)
4.150(0.163)
1.200(0.047)
1.500(0.059)
2.900(0.114)
3.310(0.130)
1.600(0.063)
TYP
0.360(0.014)
0.480(0.019)
1.270(0.050)
TYP
A Product Line of
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AH920
14.000(0.551)
15.500(0.610)
0.360(0.014)
0.510(0.020)
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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Package Outline Dimensions (All dimensions in mm(inch). Cont.)
(2) Package Type: SOT-23-3
2. 820(0. 111)
3. 100(0. 122)
1. 230(0.048)
1. 530(0.060)
A Product Line of
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AH920
0. 100(0. 004)
0. 200(0. 008)
Package Sensor
Location
0. 950(0. 037)
TYP
1. 800(0. 071)
2. 000(0. 079)
0. 200(0. 008)
0. 770(0. 030)
1. 070(0. 042)
0. 300(0. 012)
0. 500(0. 020)
0
8
0. 000(0. 000)
0. 150(0. 006)
0. 900(0. 035)
1. 300(0. 051)
AH920
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HIGH SENSITIVITY CMOS HALL-EFFECT LATCH

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A Product Line of
Diodes Incorporated
AH920
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
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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
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representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2013, Diodes Incorporated
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AH920
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