Texas Instruments LM431ACM3/NOPB adjustable shunt voltage reference, ±2.2% tolerance, 100 mA output, 2.495V–37 V, 50 ppm/°C, SOT-23-3, 0°C–70°C.
| Parameter | Value |
|---|---|
| Output type | Adjustable |
| Mounting | Surface Mount |
| Reference type | Shunt |
| Voltage - output | 37 V |
| Voltage - output (Min (Fixed)) | 2.495V |
| Output current | 100 mA |
| Current - cathode | 1 mA |
| Operating temperature | 0°C ~ 70°C (TA) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Tolerance | ±2.2% |
| Case | TO-236-3, SC-59, SOT-23-3 |
| Temperature coefficient | 50ppm/°C Typical |
The LM431ACM3/NOPB is a three-terminal adjustable shunt voltage reference from Texas Instruments. It sets a stable voltage between 2.495 V (min) and 37 V (max) using two external resistors. Output current is rated to 100 mA, and the minimum cathode current for regulation is 1 mA — the load and bias budget for the shunt leg.
It is ROHS3 compliant.
Yes — the LM431ACM3/NOPB is functionally equivalent to the industry-standard TL431 adjustable shunt reference. It shares the same three-terminal topology, 2.495 V reference, and adjustable output to 37 V. The ±2.2% tolerance and 50 ppm/°C drift are within the typical TL431 datasheet range. Verify the SOT-23-3 pinout matches your board layout before committing the BOM.