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What is TL431?

This electronic component, produced by the manufacturer "STMicroelectronics", performs the same function as "PROGRAMMABLE VOLTAGE REFERENCE".


TL431 Datasheet PDF - STMicroelectronics

Part Number TL431
Description PROGRAMMABLE VOLTAGE REFERENCE
Manufacturers STMicroelectronics 
Logo STMicroelectronics Logo 

The TL431 is programmable shuntvoltage references with guaranteed temperaturestability over the entire operating temperaturerange.

With the use of an external voltage divider, a TL431 can regulate voltages ranging from 2.5 to 36 V, at currents up 100 mA.

TL431 can be used as a voltage detector by connecting a voltage divider between the input voltage and reference terminal. When the input voltage exceeds the reference voltage, the TL431 turns on and conducts current, indicating that the input voltage has reached a certain threshold. This application is commonly used for overvoltage protection and battery voltage monitoring.


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TL431
TL432
Programmable voltage reference
Features
Adjustable output voltage: 2.5 to 36 V
Sink current capability: 1 to 100 mA
Typical output impedance: 0.22 Ω
1% and 2% voltage precision
Automotive temp. range - 40 °C to +125 °C
Applications
Power supply
Industrial
Automotive
Description
The TL431 and TL432 are programmable shunt
voltage references with guaranteed temperature
stability over the entire operating temperature
range. The device temperature range is extended
for the automotive version from -40 °C up to
+125 °C. The output voltage can be set to any
value between 2.5 and 36 V with two external
resistors. The TL431 and TL432 operate with a
wide current range from 1 to 100 mA with a typical
dynamic impedance of 0.22 Ω.
Datasheet production data
Z
TO-92
(Plastic package)
L
SOT23-3
L
SOT23-5
C
SOT323-6
D
SO-8
(Batwing plastic micropackage)
December 2012
This is information on a product in full production.
Doc ID 4467 Rev 11
1/21
www.st.com
21

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TL431 equivalent
TL431, TL432
3 Electrical characteristics
Electrical characteristics
Table 3.
Symbol
TL431C (Tamb = 25° C unless otherwise specified)
Parameter
TL431C
Min. Typ. Max.
TL431AC
Min. Typ. Max.
Unit
Reference input voltage
Vref VKA = Vref, Ik = 10 mA, Tamb = 25° C
Tmin Tamb Tmax
2.44 2.495 2.55 2.47 2.495 2.52 V
2.423
2.567 2.453
2.537
ΔVref
Reference input voltage deviation over temperature
range (1)
VKA = Vref, Ik = 10 mA, Tmin Tamb Tmax
3 17
mV
3 15
Ratio of change in reference input voltage to change
Δ----V---r--e---f
ΔVka
in cathode to anode voltage
Ik = 10 mA - ΔVKA = 10 V to Vref
ΔVKA = 36 V to 10 V
-2.7 -1.4
-2 -1
-2.7 -1.4
-2 -1
mV/V
Reference input current
Iref
Ik = 10 mA, R1 = 10 kΩ, R2 =
Tamb = 25° C
Tmin Tamb Tmax
1.8 4
5.2
1.8 4
5.2
µA
Reference input current deviation over temperature
range
ΔIref Ik = 10 mA, R1 = 10 kΩ, R2 =
Tmin Tamb Tmax
0.4 1.2
0.4 1.2
µA
Minimum cathode current for regulation
Imin VKA = Vref
0.5 1
mA
0.5 0.6
Ioff
ZKA
Off-state cathode current
Dynamic impedance (2)
VKA = Vref, Δ Ik = 1 to 100 mA, f 1 kHZ
2.6 1000
0.22 0.5
2.6 1000 nA
Ω
0.22 0.5
1. See definition of Section 3.1: Reference input voltage deviation over temperature range.
2. The dynamic impedance is defined as |ZKA| = Δ-----V----K----A--
ΔIk
Doc ID 4467 Rev 11
5/21


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TL431 Datasheet


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