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Texas Instruments LM2940T-12.0 — Analog & Data Acquisition

LM2940T-12.0 12V 1A LDO Regulator, TO-220, NRND

MPNLM2940T-12.0
NRND

Texas Instruments LM2940T-12.0, fixed 12V output LDO regulator, 1A, 1V dropout max, 66 dB PSRR at 120 Hz, TO-220-3, -40°C to 125°C.

$2.7000Ref. price · indicative, final on quote
Texas Instruments LM2940T-12.0 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM2940T-12.0 specifications
ParameterValue
Output typeFixed
MountingThrough Hole
Voltage - input26V
Voltage dropout1V @ 1A
Voltage - output (Min (Fixed))12V
Output current1A
Current - supply15 mA
Current - quiescent10 mA
Operating temperature-40°C~125°C
PSRR66dB (120Hz)
PackageTube
CaseTO-220-3
Protection featuresOver Current, Over Temperature, Reverse Polarity, Short Circuit
Number of regulators1
Output configurationPositive

Product details

The LM2940T-12.0: The 1 V maximum dropout at full load means the input rail must stay above 13 V to maintain regulation — a 13.8 V nominal supply (common in automotive and industrial systems) leaves 0.8 V of headroom, which is tight but workable if the input is well-filtered.

The 66 dB PSRR at 120 Hz attenuates ripple from a full-wave rectified mains supply.

Protection suite and temperature range

Built-in protection covers over-current, over-temperature, reverse polarity, and short-circuit — the reverse polarity clamp is especially useful in battery-powered or vehicle applications where the input can be accidentally reversed.

Frequently asked questions

Is LM2940T-12.0 obsolete or NRND?

Existing BOM lines can still be filled, but new designs should look for an alternative.

What is the replacement for LM2940T-12.0?

For a pin-compatible substitute, look at other TO-220-3 fixed 12 V LDOs in the same current class — confirm the dropout voltage and PSRR match your design margin before substituting.