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Texas Instruments LM2940SX-8.0/NOPB — Analog & Data Acquisition

LM2940SX-8.0/NOPB 8V 1A LDO Regulator, TO-263

MPNLM2940SX-8.0/NOPB
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Texas Instruments LM2940SX-8.0/NOPB, positive fixed 8V output LDO voltage regulator, 1A output, 1V dropout max, PSRR 66dB at 120Hz, -40°C to 125°C, DDPAK/TO-263-3 package, surface mount.

$2.5000Ref. price · indicative, final on quote
Texas Instruments LM2940SX-8.0/NOPB datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM2940SX-8.0/NOPB specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input26V
Voltage dropout1V @ 1A
Voltage - output (Min (Fixed))8V
Output current1A
Current - supply15 mA
Current - quiescent10 mA
Operating temperature-40°C~125°C
PSRR66dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
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

8 V fixed output, 1 A capability — what the dropout means for your rail

The Texas Instruments LM2940SX-8.0/NOPB is a positive fixed-output LDO regulator delivering 8 V at up to 1 A. The maximum dropout voltage is 1 V at full load, so the input rail must stay above 9 V to maintain regulation — a 9 V or 12 V bus is the typical upstream choice. The 66 dB PSRR at 120 Hz tells you this part attenuates full-wave rectified ripple by a factor of 2000, which matters when the regulator sits after a bulk capacitor on a 50/60 Hz rectifier stage.

Industrial temperature grade and protection set

The protection block includes over-current, over-temperature, reverse polarity, and short-circuit — all on-chip, no external clamp diode needed for the reverse condition.

Package and thermal: DDPAK/TO-263-3

The DDPAK/TO-263-3 surface-mount package (3 leads plus exposed tab) is the same footprint as D²Pak.

The base product number LM2940 covers a family of fixed-output voltages; the -8.0/NOPB suffix identifies the 8 V variant in lead-free (NOPB) finish.

Frequently asked questions

What is the difference between LM2940SX-8.0/NOPB and other LM2940 variants?

The LM2940 family shares the same 1 A capability, dropout, and protection features across fixed output voltages. The -8.0/NOPB suffix selects the 8 V output and lead-free finish. Other variants offer 5 V, 10 V, 12 V, and 15 V outputs — the package and pinout are identical, so a board laid out for one voltage can accept another by changing the regulator only.

What is the PSRR of LM2940SX-8.0/NOPB?

PSRR is 66 dB at 120 Hz, which corresponds to a ripple attenuation of roughly 2000:1 at the full-wave rectifier fundamental frequency.