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Texas Instruments TL431BIDBZR — Analog & Data Acquisition

TL431BIDBZR Adjustable Shunt Reference, ±0.5%, SOT-23-3

MPNTL431BIDBZR
Active

Texas Instruments TL431 series, TL431BIDBZR, adjustable shunt voltage reference, output 2.495V min to 36V max, ±0.5% tolerance, 100 mA output, SOT-23-3, -40°C to 85°C.

$0.4500Ref. price · indicative, final on quote
Texas Instruments TL431BIDBZR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TL431BIDBZR 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±0.5%
CaseTO-236-3, SC-59, SOT-23-3

Product details

Adjustable shunt reference with B-grade precision

The B-grade tolerance of ±0.5% puts it a step above the standard 1% grade — useful when the feedback divider in a power supply or the reference input of an ADC needs tighter accuracy without moving to a fixed-voltage part. It sinks up to 100 mA and requires a minimum of 700 µA cathode current to stay in regulation. That 700 µA floor sets the bias resistor value — for a given supply rail, R = (Vin - Vref) / 0.0007, and the resistor must also handle the load current when the reference is off.

SOT-23-3 — small, reworkable, widely stocked

The SOT-23-3 package (also known as TO-236-3 or SC-59) is a three-lead surface-mount footprint roughly 2.9 mm × 1.3 mm. It hand-solders cleanly with a fine-tip iron and lifts clean under hot air — no hidden thermal pad, no risk of tombstoning if the pad geometry is balanced.

Frequently asked questions

What is the difference between TL431BIDBZR and TL431AIDBZR?

The primary difference is the initial tolerance: TL431BIDBZR is ±0.5%, while TL431AIDBZR is ±1%. Both share the same SOT-23-3 package, pinout, output voltage range, and 100 mA sink capability. The B-grade is the tighter-tolerance variant for applications that need better reference accuracy.

What is the cathode current for TL431BIDBZR?

The minimum cathode current required to maintain regulation is 700 µA. The device can sink up to 100 mA of continuous output current.

Is TL431BIDBZR RoHS compliant?

Texas Instruments lists this part as RoHS-compliant and lead-free per its standard green material declaration.