TL431 2% Accuracy Adjustable Precision Shunt Regulator | TI.com

TL431 (ACTIVE)

2% Accuracy Adjustable Precision Shunt Regulator

2% Accuracy Adjustable Precision Shunt Regulator - TL431
 

Recommended alternative parts

  • ATL431  -  30X lower Ik (35uA max), as well as improved stability
  • TL431LI  -  The TL431LI adjustable shunt reference offers optimized reference current
  • 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

Different accuracy grades available

This device is available in 3 accuracy grades :

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. 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)
Iz for Regulation (Min) (uA)
Iout/Iz (Max) (mA)
Package Group
TL431 ATL431 ATL432 LM431 LMV431 TL431A TL431A-Q1 TL431B TL432 TL432A TL432A-Q1 TL432B TL432B-Q1 TLVH431 TLVH431A TLVH431B TLVH432 TLVH432A TLVH432B
Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable    
2.495     2.5     2.5     2.5     1.24     2.495     2.495     2.495     N/A     2.495     2.495     2.495     N/A     N/A     N/A     N/A     N/A     N/A     N/A    
2.495     2.5     2.5     2.5     1.24     2.495     2.495     2.495     2.495     2.495     2.495     2.495     2.495     1.24     1.24     1.24     1.24     1.24     1.24    
36     36     36     36     30     36     36     36     36     36     36     36     36     18     18     18     18     18     18    
2     0.5
1    
0.5
1    
0.5
1
2    
1.5     1     1     0.5     2     1     1     0.5     0.5     1.5     1     0.5     1.5     1     0.5    
92     92     92     97     129
138    
92     92     92     92     92     92     92     92     138     138     138     138     138     138    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Automotive     Catalog     Catalog     Catalog     Automotive     Catalog     Automotive     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125
-40 to 85
0 to 70    
-40 to 125
-40 to 85    
-40 to 125     -40 to 85
0 to 70    
-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