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Texas Instruments TL431AIDBZR — Analog & Data Acquisition

TL431AIDBZR Texas Instruments Shunt Reference, ±1%, SOT-23-3

MPNTL431AIDBZR
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Texas Instruments TL431AIDBZR, adjustable shunt voltage reference, ±1% tolerance, 2.495 V min output, 100 mA cathode current, SOT-23-3 surface-mount package, -40°C to 85°C.

$0.09574Ref. price · indicative, final on quote
Texas Instruments TL431AIDBZR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TL431AIDBZR specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Output current100 mA
Current - cathode700 µA
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±1%
CaseTO-236-3, SC-59, SOT-23-3

Product details

What the TL431AIDBZR does in a supply or error-amplifier loop

It acts as a precision programmable Zener — the reference voltage at the REF pin sets the output threshold, and the cathode sinks current to regulate the loop. With a ±1% tolerance on the internal reference, this grade suits applications where tighter accuracy matters — think isolated flyback feedback, linear regulator error amplifiers, or precision over-voltage detection. The 100 mA cathode current rating is enough to drive an optocoupler LED directly in a secondary-side feedback loop.

Package and footprint — SOT-23-3 assembly notes

The part comes in a SOT-23-3 package (also referred to as TO-236-3 or SC-59). It is a three-lead surface-mount package.

Frequently asked questions

What is the exact specification of TL431AIDBZR?

The TL431AIDBZR is an adjustable shunt voltage reference with a ±1% tolerance. Its output voltage range is 2.495 V minimum to 36 V maximum. It can sink up to 100 mA at the cathode, with a minimum cathode current of 700 µA. It comes in a SOT-23-3 surface-mount package.

Is TL431AIDBZR a good replacement for TL431AIDBZT?

The TL431AIDBZR and TL431AIDBZT share the same base product number TL431 and the same ±1% tolerance. The difference is the package suffix: DBZR is Tape & Reel, DBZT is typically cut tape. Electrically they are identical. The DBZR variant is the reeled version for automated pick-and-place; the DBZT is the cut-tape option for smaller quantities. As long as the package (SOT-23-3) and pinout match, the DBZR is a direct replacement for the DBZT.