SE431 Datasheet PDF - Seaward

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SE431
Seaward

Part Number SE431
Description ADJUSTABLE PRECISION SHUNT REGULATOR
Page 8 Pages


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SEAWARD
ELECTRONICS
Adjustable Precision
Shunt Regulator
SE431
Description
The SE431 is a low voltage three terminal
adjustable shunt regulator with a guaranteed thermal
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stability over applicable temperature ranges. The output
voltage can be set to any value between VREF
(approximately 2.5 V) to 18V with two external resistors.
This device has a typical output impedance of 0.2.
Active output circuitry provides a very sharp turn on
characteristic, making this device excellent replacement
for Zener diodes in many applications.
The SE431 is characterized for operation from 0oC
to 105oC, and five package options (SOT-23-3, SOT-23-5,
SOP-8, TO-92 and SOT-89) allow the designer the
opportunity to select the proper package for their
applications.
Features
¾ Low voltage operation (2.5V)
¾ Adjustable output voltage V0 = VREF to 18V
¾ Wide operating current range 120µA to 100mA
¾ Low dynamic output impedance 0.2(Typ.).
¾ Trimmed bandgap design up to + 0.5%.
¾ ESD rating is 5.5KV(Per MIL-STD-883D).
¾ Available in Lead Free Packages.
Application
¾ Linear Regulators
¾ Adjustable Supplies
¾ Switching Power Supplies
¾ Battery Operated Computers
¾ Instrumentation
¾ Computer Disk Drives
Block Diagram
Cathode
Ref
+
-
Symbol Diagram
Cathode
Vref Ref
Anode
Anode
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 1



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SEAWARD
ELECTRONICS
Adjustable Precision
Shunt Regulator
SE431
Marking Information
Package Marking
Production Year Code
Production Week Code Lead-Free Package
SOT-23-3
www.datasheet4u.comSE431W
SC59-3L
SOT-23-3
S431W
(SE431S)
Starting with S, a bar on top of S is for production
year 2001, and underlined S is for year 2002.
The next character is marked on top for 2003, and
underlined for 2004. The naming pattern continues
A-Z: 1-26
a-z: 27-52
Lead-free package is
indicated by a dot on
top of the week code.
SOT-23-5L SE431W with consecutive characters for later years.
SOP-8
SOT-89
TO-92
SE431
YYWW
SE431
YYWW
SE431
YYWW
YY is the year of production. 04 means the
product is manufactured in year of 2004.
WW is the week of
production. 26 means the
product is manufactured in
the 26th week.
Lead-free package is
indicated by LF after
YYWW.
Pin Configuration
SOT-23-3
SOT-23-3L (SC59-3L)
SOT-23-3
(Order as SE431S)
SOT-23-5L
SOP-8
TO-92
(Top View)
SOT-89
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© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 2



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SEAWARD
ELECTRONICS
Adjustable Precision
Shunt Regulator
SE431
Absolute Maximum Ratings
Parameter
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Cathode Voltage
Continuous Cathode Current
Reference Current
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance
Lead Temperature (Soldering) 10 seconds
Symbol
VKA
I KA
I REF
TJ
TSTG
θ JA
TLEAD
Maximum
18
150
10
150
-65 to 150
120 (SOT-89)
230 (SOT-23-3)
230 (SOT-23-5L)
150 (SOP-8)
220 (TO-92)
260
Units
V
mA
mA
°C
°C
°C/W
°C
Electrical Characteristics
PARAMETER
SYMBOL
0.5%
Reference Voltage
1%
2%
Deviation of reference voltage over
full temperature range
Ratio of change in reference
voltage to the change in cathode
voltage
VREF
VI(dev)
VREF
________
VKA
Reference current
IREF
Deviation of Reference current
over full temperature range
Minimum cathode current for
regulation
Off-state cathode current
II(dev)
IMIN
IOFF
Dynamic impedance
ZKA
TEST
CIRCUIT
TEST CONDITIONS
1 VKA = VREF, IKA = 10mA
VKA = VREF, IKA = 10mA
1
TA = 0°C to 105°C
IKA = 10mA,
2
VKA = 10 V - VREF
IKA = 10mA,
2
R1=10k, R2 =
IKA = 10mA, R1=10k,
2
R2 = , TA = 0°C to 105°C
1 VKA = VREF
3 VKA = 18V, VREF = 0
IKA = 1mA to 100mA, VKA =
1
VREF, f 1kHZ
MIN
2483
2470
2445
--
--
--
--
--
--
--
TYP
2495
2495
2495
4
-1.4
2
0.4
0.2
0.1
0.2
MAX UNIT
2507
2520
2545
mV
25 mV
-2.7 mV/V
4 µA
1.2 µA
1 mA
1 µA
0.7
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 3



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SEAWARD
ELECTRONICS
Adjustable Precision
Shunt Regulator
SE431
Typical Performance Characteristics
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150
125
100
75
50
25
0
-25
-50
-75
-100
-2
CATHODE CURRENT
Vs.
CATHODE VOLTAGE
VKA = Vref
TA = 25oC
-1 0 1 2
Cathode Voltage (V)
3
CATHODE CURRENT
Vs.
CATHODE VOLTAGE
800
V KA = V ref
TA = 25oC
600
400
200
0
- 200
-1
01 2
Cathode Voltage (V)
3
REFERENCE VOLTAGE
Vs.
JUNCTION TEMPERATURE
2520
2515
2510
VKA =Vref
IKA =10mA
2505
2500
2495
2490
2485
2480
- 60 - 40 - 20 0 20 40 60 80 100 120
Junction Temperature ( oC)
REFERENCE INPUT CURRENT
Vs.
JUNCTION TEMPERATURE
3
R1 = 10k
2. 5 R2 =
IKA =10mA
2
1. 5
1
0. 5
0
- 20 0 20 40 60 80 100 120
Junction Temperature ( oC)
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 4



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