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Texas Instruments LM2940S-9.0 — Analog & Data Acquisition

LM2940S-9.0 9V 1A LDO Regulator, TO-263, PSRR 64dB

MPNLM2940S-9.0
Obsolete

Texas Instruments LM2940S-9.0, fixed 9V positive LDO regulator, 1A output, 1V max dropout, PSRR 64dB at 120Hz, -40°C to 125°C, TO-263-3 DDPAK, tube.

Texas Instruments LM2940S-9.0 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM2940S-9.0 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input26V
Voltage dropout1V @ 1A
Voltage - output (Min (Fixed))9V
Output current1A
Current - supply15 mA
Current - quiescent10 mA
Operating temperature-40°C~125°C
PSRR64dB (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

9 V fixed LDO in a TO-263 DDPAK

The LM2940S-9.0: It comes in a TO-263-3 (DDPAK) surface-mount package with a tab for heat sinking. The 64 dB PSRR at 120 Hz makes it a clean choice for post-switcher rails feeding analog or audio loads.

Dropout and protection — real-world margin

Maximum dropout is 1 V at 1 A, so the input rail needs at least 10 V to maintain regulation at full load. The 15 mA maximum supply current and 10 mA quiescent current are modest for a 1 A LDO, but not ultra-low-power — factor them into standby budgets. Built-in protection covers over-current, over-temperature, reverse polarity, and short circuit — no external clamp diodes or crowbar circuits needed for basic fault tolerance.

The LM2940S-9.0 is listed as obsolete.

Frequently asked questions

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