GS431B/TL431A/TL431
Preliminary
Vishay
formerly General Semiconductor
Adjustable Precision Shunt Regulators
SO-8
SOT-23
SOT-89
TO-92
8
7
3
6
5
1
1
1
2
2
3
3
2
4
LP Suffix
S Suffix
U Suffix
X Suffix
1
2
3
Features
Description
• Programmable Output Voltage to 30V
The GS431B/TL431A/TL431 are 3-terminal adjustable
precision shunt regulators with guaranteed temperature
stability over the applicable extended commercial
temperature range. The output voltage may be set at any
level greater than 2.495V (VREF) up to 30V merely by
selecting two external resistors that act as a voltage divider
network.These devices have a typical output impedance of
0.08Ω. Active output circuitry provides very sharp turn-on
characteristics, making these devices excellent improved
replacements for zener diodes in many applications.
• Precision Reference Voltage
GS431B: 2.495V ±0.5%
TL431A: 2.495V ±1.0%
TL431:
2.495V ±1.6%
• Sink Current Capability: 200mA.
• Minimum Cathode Current for Regulation: 250µA
• Equivalent Full-Range Temperature Coefficient:
50 ppm/°C
• Fast Turn-On Response
The precise ±0.5% reference voltage tolerance of the
GS431B makes it possible in many applications to avoid
the use of a variable resistor, consequently saving cost and
eliminating drift and reliability problems associated with it.
• Low Dynamic Output Impedance: 0.08Ω
• Low Output Noise
Symbol
Applications
CATHODE (C)
• Voltage Monitor
• Delay Timer
• Constant-Current Source/Sink
• High-Current Shunt Regulator
• Crow Bar
REF (R)
• Over-Voltage/Under-Voltage Protection
ANODE (A)
Mechanical Data
Case: SO-8, SOT-23, SOT-89, TO-92
High temperature soldering guaranteed:
260°C/10 seconds at terminals
Block Diagram
REF (R)
CATHODE (C)
+
Case outlines are on the back pages
-
2.495V
ANODE (A)
Document Number 74806
1-Jul-02
www.vishay.com
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