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Texas Instruments LM431BCM3X/NOPB — Analog & Data Acquisition

TI LM431BCM3X/NOPB Adjustable Shunt Reference, ±1%, SOT-23-3

MPNLM431BCM3X/NOPB
End of Life

Texas Instruments LM431BCM3X/NOPB adjustable shunt voltage reference, ±1% tolerance, 2.495V to 37V output, 100 mA output current, SOT-23-3 surface-mount package, 0°C to 70°C operating temperature.

$0.89Ref. price · indicative, final on quote
Texas Instruments LM431BCM3X/NOPB 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

LM431BCM3X/NOPB specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output37 V
Voltage - output (Min (Fixed))2.495V
Output current100 mA
Current - cathode1 mA
Operating temperature0°C ~ 70°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±1%
CaseTO-236-3, SC-59, SOT-23-3
Temperature coefficient50ppm/°C Typical

Product details

Output range and current — sizing the feedback divider

The adjustable output from 2.495 V to 37 V means this part replaces fixed-voltage zener diodes across a wide range of rail voltages. The 100 mA output current is high for a shunt reference in a SOT-23 — enough to drive an optocoupler LED plus a bias resistor in a feedback loop, or to pull down a slow logic line. Minimum cathode current is 1 mA; design the bias resistor to keep at least that flowing at the lowest input voltage and highest load.

Package and procurement options

The Cut Tape option suits prototype builds and small-batch repairs without committing to a full reel.

Frequently asked questions

What is the LM431BCM3X/NOPB tolerance?

±1% initial tolerance.

What are alternatives to LM431BCM3X/NOPB?

The LM4132AMF-4.1/NOPB is a series reference with fixed 4.096 V output, ±0.05% tolerance, and a wider -40°C to 125°C range, but it is a different topology (series vs shunt) and cannot be adjusted. For a pin-compatible shunt alternative, look at other LM431 grade variants in SOT-23-3.