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TL1431

ACTIVE

Precision adjustable (programmable) shunt reference

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TL431 ACTIVE Adjustable precision shunt regulator For cost optimized designs
TLA431 ACTIVE All-capacitor stable precision programmable reference with KRA pin layout Improved to all load cap stability, improved temperature drift, decreased minimum cathode current

TL1431

ACTIVE
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Product details

Rating Automotive, Catalog VO (V) 2.5 Initial accuracy (max) (%) 0.4 Iz for regulation (min) (µA) 450 VO adj (min) (V) 2.5 VO adj (max) (V) 36 Reference voltage (V) adjustable Temp coeff (max) (ppm/°C) 114 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 150
Rating Automotive, Catalog VO (V) 2.5 Initial accuracy (max) (%) 0.4 Iz for regulation (min) (µA) 450 VO adj (min) (V) 2.5 VO adj (max) (V) 36 Reference voltage (V) adjustable Temp coeff (max) (ppm/°C) 114 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 150
SOIC (D) 8 29.4 mm² 4.9 x 6 TO-92 (LP) 3 19.136 mm² 5.2 x 3.68 TSSOP (PW) 8 19.2 mm² 3 x 6.4
  • 0.4% Initial Voltage Tolerance
  • 0.2Ω Typical Output Impedance
  • Fast Turnon (500ns)
  • Sink Current Capability (1mA to 100mA)
  • Low Reference Current (REF)
  • Adjustable Output Voltage (VI(ref) to 36V)
  • 0.4% Initial Voltage Tolerance
  • 0.2Ω Typical Output Impedance
  • Fast Turnon (500ns)
  • Sink Current Capability (1mA to 100mA)
  • Low Reference Current (REF)
  • Adjustable Output Voltage (VI(ref) to 36V)

The TL1431 device is a precision programmable reference with specified thermal stability over automotive, commercial, and military temperature ranges. The output voltage can be set to any value between VI(ref) (approximately 2.5V) and 36V with two external resistors (see Figure 8-3). This device has a typical output impedance of 0.2Ω. Active output circuitry provides a sharp turnon characteristic, making the device an excellent replacement for Zener diodes and other types of references in applications such as onboard regulation, adjustable power supplies, and switching power supplies.

The TL1431C is characterized for operation over the commercial temperature range of 0°C to 70°C. The TL1431Q is characterized for operation over the full automotive temperature range of –40°C to 125°C. The TL1431M is characterized for operation over the full military temperature range of –55°C to 125°C.

The TL1431 device is a precision programmable reference with specified thermal stability over automotive, commercial, and military temperature ranges. The output voltage can be set to any value between VI(ref) (approximately 2.5V) and 36V with two external resistors (see Figure 8-3). This device has a typical output impedance of 0.2Ω. Active output circuitry provides a sharp turnon characteristic, making the device an excellent replacement for Zener diodes and other types of references in applications such as onboard regulation, adjustable power supplies, and switching power supplies.

The TL1431C is characterized for operation over the commercial temperature range of 0°C to 70°C. The TL1431Q is characterized for operation over the full automotive temperature range of –40°C to 125°C. The TL1431M is characterized for operation over the full military temperature range of –55°C to 125°C.
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Technical documentation

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Type Title Date
* Data sheet TL1431 Precision Programmable Reference datasheet (Rev. O) PDF | HTML 30 Oct 2025
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note Setting the shunt voltage on an adjustable shunt regulator 01 Sep 2011

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Supported products & hardware

Products
Shunt voltage references
  • TL1431 — Precision adjustable (programmable) shunt reference
  • TL431 — Adjustable precision shunt regulator
  • TL432 — Adjustable precision shunt regulator (reverse pinout)
  • TLV431 — 1.5% accuracy, low-voltage, adjustable precision shunt regulator
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SOIC (D) 8 Ultra Librarian
TO-92 (LP) 3 Ultra Librarian
TSSOP (PW) 8 Ultra Librarian
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