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Texas Instruments ATL431LIAQDBZR — Analog & Data Acquisition

Texas Instruments ATL431LIAQDBZR Shunt Voltage Reference

MPNATL431LIAQDBZR
Active

Texas Instruments ATL431LIAQDBZR, adjustable shunt voltage reference, 2.5V to 36V output, ±1% tolerance, 100 µA cathode current, SOT-23-3 package, -40°C to 125°C operating temperature.

$0.6500Ref. price · indicative, final on quote
Texas Instruments ATL431LIAQDBZR datasheet (PDF)
PackagingTO-236-3, SC-59, SOT-23-3
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

ATL431LIAQDBZR 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±1%
CaseTO-236-3, SC-59, SOT-23-3

Product details

Adjustable shunt reference for precision bias and regulation

The output is adjustable from a 2.5V minimum to a 36V maximum via two external resistors. That 36V ceiling covers 24V industrial rails and 12V automotive buses with headroom. The 100 µA cathode current is the minimum needed to keep the reference in regulation — below that the output drifts. In practice, bias the cathode with a resistor to a supply that delivers at least 100 µA at the programmed output voltage, plus whatever load current the shunt sinks. The 15 mA maximum output current handles driving an optocoupler LED or biasing a small-signal transistor without a buffer.

The base product number ATL431 spans multiple tolerance and temperature grades, so if a tighter bin is needed later the footprint stays the same.

Frequently asked questions

Is ATL431LIAQDBZR obsolete or active?

It is active. Texas Instruments lists the product status as Active with no discontinuation notice. It can be sourced for both new and existing designs.

What is the cathode current for ATL431LIAQDBZR?

The minimum cathode current is 100 µA. The device can sink up to 15 mA output current.

Does ATL431LIAQDBZR replace TL431?

The ATL431 is a newer, low-Iknee variant of the classic TL431 architecture. It is pin-compatible and functionally equivalent in most shunt reference circuits, but the lower minimum cathode current (100 µA vs typically 1 mA for TL431) allows operation in lower-power bias loops. Verify the compensation network if the TL431 design used the standard stability model.