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Texas Instruments LM431BCM3-NS — Discrete Semiconductors
Texas Instruments

LM431BCM3-NS Adjustable Shunt Voltage Reference, ±1%

MPNLM431BCM3-NS
End of Life

National Semiconductor LM431BCM3-NS adjustable shunt voltage reference, ±1% tolerance, 2.495V min / 37V max output, 100 mA cathode current, SOT-23-3 surface mount, 0°C to 70°C operating temperature.

$0.8Ref. price · indicative, final on quote
LM431BCM3-NS datasheet
PackagingTO-236-3, SC-59, SOT-23-3
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

LM431BCM3-NS Technical Specifications
ParameterValue
Output typeAdjustable
Mounting typeSurface Mount
Reference typeShunt
Voltage - output37 V
Voltage - output (Min (Fixed))2.495V
Current - output100 mA
Current - cathode1 mA
Operating temperature0°C ~ 70°C (TA)
PackageBulk
Tolerance±1%
CaseTO-236-3, SC-59, SOT-23-3
Temperature coefficient50ppm/°C Typical

Product details

Shunt reference for commercial bias and regulation

The LM431BCM3-NS from National Semiconductor is a three-terminal adjustable shunt voltage reference in a SOT-23-3 surface-mount package. It delivers a programmable output from 2.495 V up to 37 V with ±1% initial tolerance, sinking up to 100 mA through the cathode. The part requires a minimum cathode current of 1 mA to maintain regulation and is specified over the 0°C to 70°C commercial temperature range. Typical applications include precision shunt regulators, series-pass voltage references, current limiters, and error amplifiers in power supplies and bias circuits for indoor, temperature-controlled equipment.

Cathode current and load driving

The 100 mA maximum cathode current defines load sinking capability. The 1 mA minimum cathode current sets a floor on the bias resistor value.

Package and mounting

Supplied in SOT-23-3 (TO-236-3 / SC-59) surface-mount package. The small footprint suits dense PCB layouts but limits thermal dissipation.

Lifecycle and compliance

Product status is Active per the manufacturer. The part is marked as RoHS non-compliant, which means it contains lead (Pb) and is not exempt for most new EU-market products. Check your regional RoHS exemption status before specifying.

Frequently asked questions

What is the difference between the LM431BCM3 and LM431BCM3-NS?

The suffix '-NS' typically indicates a non-standard packaging or marking variant from National Semiconductor. Electrically, the LM431BCM3-NS shares the same shunt reference core with ±1% tolerance, 2.495 V to 37 V output range, and 100 mA cathode current. The primary difference is the shipping medium — the '-NS' variant is supplied in Bulk rather than the standard tape-and-reel. Verify the exact order code against your BOM line; the electrical characteristics are identical.