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Texas Instruments ATL431AIDBZR — Analog & Data Acquisition

ATL431AIDBZR adjustable shunt regulator, 100 mA, ±1%

MPNATL431AIDBZR
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Texas Instruments ATL431AIDBZR adjustable shunt voltage reference, 100 mA output, ±1% tolerance, 48 ppm/°C drift, 2.5 V fixed reference, SOT-23-3 package, -40°C to 85°C.

$0.5100Ref. price · indicative, final on quote
Texas Instruments ATL431AIDBZR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

ATL431AIDBZR specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.5V
Output current100 mA
Current - cathode35 µA
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±1%
CaseTO-236-3, SC-59, SOT-23-3
Temperature coefficient48ppm/°C

Product details

Shunt reference that doesn't starve the feedback loop

It sinks up to 100 mA — enough to drive the LED in a PC817 optocoupler and still hold regulation across load steps. The minimum cathode current to stay in regulation is 35 µA, so you can bias it from a high-impedance divider without wasting power. The reference voltage is 2.5 V with a ±1% tolerance, and the output can be programmed up to 36 V with two resistors.

Housed in a SOT-23-3 package, the ATL431AIDBZR fits tight layouts on a 24 V industrial PSU or a 12 V automotive ECU board. The shunt architecture means no external compensation capacitor — just the resistor divider and the output capacitor for noise filtering. Surface-mount assembly in the SOT-23-3 footprint is standard; the small pad area means the thermal rise at 100 mA continuous output is manageable with basic copper pour.

Frequently asked questions

Is the ATL431AIDBZR the same as the TL431?

No, but it is a direct functional replacement with a lower minimum cathode current. The classic TL431 needs about 1 mA to regulate; the ATL431 needs only 35 µA, making it a better fit for low-power bias circuits where every microamp counts. The pinout and basic application circuit are identical — same SOT-23-3 footprint, same resistor-divider programming.

What is the cathode current range for the ATL431AIDBZR?

The minimum cathode current to maintain regulation is 35 µA, and the maximum continuous cathode current is 100 mA. The shunt must always see at least 35 µA through the cathode to keep the reference stable; below that the output voltage drifts.