TL431_432 Datasheet, PDF (1/14 Pages) Diodes Incorporated – ADJUSTABLE PRECISION SHUNT REGULATOR

TL431/TL432
ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The TL431 and TL432 are three terminal adjustable shunt
regulators offering excellent temperature stability and output
current handling capability up to 100mA. The output voltage
may be set to any chosen voltage between 2.5 and 36 volts
by selection of two external divider resistors.
The devices can be used as a replacement for zener diodes
in many applications requiring an improvement in zener
performance. Diodes’ TL431 has the same electrical
specifications as the industry standard ‘431 and is available
in 2 grades with initial tolerances of 1% and 0.5% for the
A and B grades respectively.
Features
• Temperature range -40 to 125ºC
• Reference Voltage Tolerance at 25°C
• TL431A: 2.495V ± 1.0%.
• TL431B: 2.495V ± 0.5%
• Low Output Noise
• 0.2Ω Typical Output Impedance
• Sink Current Capability: 1mA to 100mA
• Adjustable Output Voltage: V_REF to 36V
• SOT23 and SOT25: Available in “Green” Molding
Compound (No Br, Sb) and Lead Free Finish/ RoHS
Compliant (Note 1)
Applications
• Opto-Coupler Linearisers
• Shunt Regulators
• Improved Zener
• Variable Reference
Pin Assignments
TL431
(Top View)
3 REF
ANODE 1
2 CATHODE
SOT23
(Top View )
NC 1
5 ANODE
NC 2
CATHODE 3
4 REF
SOT25
TL432
(Top View)
3 CATHODE
ANODE 1
2 REF
SOT23
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
TL431/432
Document number: DS35050 Rev. 2 - 2
1 of 14
www.diodes.com
September 2010
© Diodes Incorporated