Product Summary

The TL431 is a three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V, with two external resistors. The TL431 has a typical output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic, making the TL431 excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies.

Parametrics

TL431 absolute maximum ratings: (1)Cathode voltage, VKA: 37V; (2)Continuous cathode current range, IKA: -100mA to 150mA; (3)Reference input current range: -50μA to 10mA; (4)Operating virtual junction temperature, TJ: 150℃; (5)Storage temperature range, Tstg: -65℃ to 150℃.

Features

TL431 features: (1)Operation From -40℃ to 125℃; (2)Reference Voltage Tolerance at 25℃: 0.5% B Grade; 1% A Grade; 2% Standard Grade; (3) Low Output Noise; (4)0.2-Ω Typical Output Impedance; (5) Sink-Current Capability 1mA to 100mA; (6) Adjustable Output Voltage Vref to 36V.

Diagrams

TL431 block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
TL431ACDBVRG4
TL431ACDBVRG4
Texas Instruments
Voltage & Current References Adjustable Precision Shunt Regulator
Data Sheet
0-1: $0.28
1-25: $0.18
25-100: $0.15
100-250: $0.12
TL431ACDG
TL431ACDG
ON Semiconductor
Voltage & Current References 2.5-36V ADJ 1-100mA
Data Sheet
0-1: $0.20
1-25: $0.17
25-100: $0.12
100-500: $0.10
TL431ACLPRA
TL431ACLPRA
ON Semiconductor
Voltage & Current References 2.5-36V ADJ 1-100mA
Data Sheet
Negotiable 
TL431ACDR2
TL431ACDR2
ON Semiconductor
Voltage & Current References 2.5-36V ADJ 1-100mA
Data Sheet
Negotiable 
TL431AILPM
TL431AILPM
Texas Instruments
Voltage & Current References Adjustable Precision Shunt Regulator
Data Sheet
0-1: $0.32
1-25: $0.21
25-100: $0.17
100-250: $0.14
TL431ACPK
TL431ACPK
Texas Instruments
Voltage & Current References Adjustable Precision Shunt Regulator
Data Sheet
0-1: $0.36
1-25: $0.24
25-100: $0.19
100-250: $0.16
TL431ACLPREG
TL431ACLPREG
ON Semiconductor
Voltage & Current References 2.5-36V ADJ 1-100mA
Data Sheet
0-1: $0.49
1-25: $0.40
25-100: $0.33
100-500: $0.26
TL431AILP
TL431AILP
Texas Instruments
Voltage & Current References Adj Shunt
Data Sheet
0-1: $0.27
1-25: $0.19
25-100: $0.16
100-250: $0.13