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Texas Instruments LM2940S-10 — Analog & Data Acquisition

LM2940S-10 1A Fixed 10V LDO Regulator, TO-263, NRND

MPNLM2940S-10
NRND

Texas Instruments LM2940S-10, 1A fixed 10V positive LDO voltage regulator, 63dB PSRR at 120Hz, 26V max input, 1V dropout at 1A, -40°C to 125°C, TO-263-4 (D²Pak), surface mount.

$3.2300Ref. price · indicative, final on quote
Texas Instruments LM2940S-10 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM2940S-10 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input26V
Voltage dropout1V @ 1A
Voltage - output (Min (Fixed))10V
Output current1A
Current - supply15 mA
Current - quiescent10 mA
Operating temperature-40°C~125°C
PSRR63dB (120Hz)
PackageTube
CaseTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
Protection featuresOver Current, Over Temperature, Reverse Polarity, Short Circuit
Number of regulators1
Output configurationPositive

Product details

1 A fixed 10 V LDO — what it delivers

It accepts an input up to 26 V and delivers the regulated 10 V rail with a maximum dropout of 1 V at full load.

63 dB PSRR — why it matters for the rail

The 63 dB PSRR at 120 Hz means the regulator attenuates full-wave-rectified ripple by a factor of roughly 1400. For a 10 V rail feeding an op-amp or ADC reference, that rejection keeps the ripple off the signal ground.

On-chip protection covers over-current, over-temperature, reverse polarity, and short-circuit conditions — the regulator survives a miswired bench or a load fault without external clamp diodes.

The LM2940S-10 carries a Not Recommended for New Designs (NRND) status. It is not yet discontinued, but Texas Instruments has flagged it for eventual phase-out. New designs should migrate to the recommended successor within the LM2940 family — the exact pin-compatible replacement is the LM2940S-10/NOPB, which shares the same footprint, output voltage, and current rating.

Frequently asked questions

Is the LM2940S-10 obsolete or end-of-life?

The LM2940S-10 carries a Not Recommended for New Designs (NRND) status — it is not yet discontinued, but Texas Instruments has flagged it for eventual phase-out. Existing production runs can still be supported, but new designs should use the recommended replacement.

What is the recommended replacement for the LM2940S-10?

The pin-compatible replacement is the LM2940S-10/NOPB. It shares the same TO-263-4 package, fixed 10 V output, and 1 A current rating, and is fully recommended for new designs.

Is the LM2940S-10 compatible with my existing LM2940 design?

Yes — the LM2940S-10 is a standard member of the LM2940 family. It is pin-compatible with other fixed-output LM2940 variants in the same TO-263 package. The base product number LM2940 covers the entire series, so a board laid out for any TO-263 LM2940 will accept this part.