Adjustable Precision Shunt Regulator - TL431

TL431 (ACTIVE)

Adjustable Precision Shunt Regulator

Recommended alternative parts

  • ATL431  -  30X lower Ik (35uA max), as well as improved stability
  • TLV431  -  Vout (12V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages, Vref=1.24, 2% trim accuracy
  • TLVH431  -  Wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages
  • LM4040A25  -  Similar functionality with lower operating current

Description

The TL431 and TL432 devices are three-terminal adjustable shunt regulators, 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 (see ). These devices have a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TL432 device has exactly the same functionality and electrical specifications as the TL431 device, but has different pinouts for the DBV, DBZ, and PK packages.

Both the TL431 and TL432 devices are offered in three grades, with initial tolerances (at 25°C) of 0.5%, 1%, and 2%, for the B, A, and standard grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xxC devices are characterized for operation from 0°C to 70°C, the TL43xxI devices are characterized for operation from –40°C to 85°C, and the TL43xxQ devices are characterized for operation from –40°C to 125°C.

Features

  • Reference Voltage Tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
    • 2% (Standard Grade)
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to 125°C
  • Typical Temperature Drift (TL431B)
    • 6 mV (C Temp)
    • 14 mV (I Temp, Q Temp)
  • Low Output Noise
  • 0.2-Ω Typical Output Impedance
  • Sink-Current Capability: 1 mA to 100 mA

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Parametrics Compare all products in Shunt Voltage Reference

 
Reference Voltage
VO (V)
VO Adj (Min) (V)
VO Adj (Max) (V)
Initial Accuracy (Max) (%)
Temp Coeff (Max) (ppm/ degree C)
Rating
Operating Temperature Range (C)
Min Iz for Regulation (uA)
Iout/Iz (Max) (mA)
Package Group
TL431 TL431A TL431A-Q1 TL431B TL432 TL432A TL432A-Q1 TL432B TL432B-Q1
Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable    
2.495     2.495     2.495     2.495       2.495     2.495     2.495      
2.495     2.495     2.495     2.495     2.495     2.495     2.495     2.495     2.495    
36     36     36     36     36     36     36     36     36    
2     1     1     0.5     2     1     1     0.5     0.5    
92     92     92     92     92     92     92     92     92    
Catalog     Catalog     Automotive     Catalog     Catalog     Catalog     Automotive     Catalog     Automotive    
-40 to 125
-40 to 85
0 to 70    
-40 to 125
-40 to 85
0 to 70    
-40 to 125     -40 to 125
-40 to 85
0 to 70    
-40 to 125
-40 to 85
0 to 70    
-40 to 125
-40 to 85
0 to 70    
-40 to 125     -40 to 125
-40 to 85
0 to 70    
-40 to 125    
400     400     400     400     400     400     400     400     400    
100     100     100     100     100     100     100     100     100    
PDIP
SC70
SO
SOIC
TO-92
SOT-23
SOT-89
TSSOP
WAFERSALE    
PDIP
SC70
SO
SOT-23
SOT-89
TO-92
SOIC
TSSOP    
SOT-23     SC70
SO
SOIC
PDIP
SOT-23
SOT-89
TO-92
TSSOP    
SOT-23
SOT-89    
SOT-23
SOT-89    
SOT-23     SOT-23
SOT-89    
SOT-23