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Texas Instruments ATL431LIBQDBZR — Analog & Data Acquisition

ATL431LIBQDBZR Shunt Reference, ±0.5% Tolerance, SOT-23-3

MPNATL431LIBQDBZR
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Texas Instruments ATL431LIBQDBZR adjustable shunt voltage reference, ±0.5% tolerance, 2.5 V to 36 V output, 100 µA min cathode current, SOT-23-3 package, -40°C to 125°C.

$0.5500Ref. price · indicative, final on quote
Texas Instruments ATL431LIBQDBZR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

ATL431LIBQDBZR specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.5V
Output current15 mA
Current - cathode100 µA
Operating temperature-40°C~125°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±0.5%
CaseTO-236-3, SC-59, SOT-23-3

Product details

Precision shunt reference for tight-regulation loops

The Texas Instruments ATL431LIBQDBZR is an adjustable shunt voltage reference in a SOT-23-3 package, offering a ±0.5% tolerance that tightens the feedback window in power supplies and data converters compared to the generic 1% TL431-class parts. Output voltage is adjustable from 2.5 V up to 36 V via two external resistors, covering the common reference rails for 3.3 V, 5 V, 12 V, and 24 V systems.

Low cathode current for battery-budget designs

The minimum cathode current of 100 µA allows the reference to operate with minimal bias overhead, which matters in always-on sensor nodes or portable instruments where every microamp counts. Maximum output current is 15 mA, so the ATL431LIBQDBZR can directly drive an optocoupler LED or a small load without an external buffer.

Frequently asked questions

Is ATL431LIBQDBZR a direct replacement for TL431?

The ATL431LIBQDBZR is pin-compatible with the standard TL431 in the SOT-23-3 footprint and shares the same adjustable shunt topology, but its ±0.5% tolerance and 100 µA minimum cathode current are tighter than the typical TL431's 1% tolerance and 400 µA minimum. Check the feedback resistor divider and bias current in your circuit before substituting.

What is the minimum cathode current for ATL431LIBQDBZR?

The minimum cathode current is 100 µA, which is the lowest bias current required to maintain regulation. This allows the reference to operate with very low quiescent overhead.

Is ATL431LIBQDBZR RoHS compliant and lead-free?

The ATL431LIBQDBZR is listed with a Tape & Reel / Cut Tape package option that is RoHS-compliant and lead-free per TI's standard green packaging. No separate RoHS certificate is needed for BOM compliance.