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Texas Instruments LM7812SX/NOPB — Analog & Data Acquisition

LM7812SX/NOPB – 12V 1.5A Positive Fixed Regulator, TO-263

MPNLM7812SX/NOPB
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Texas Instruments LM7812SX/NOPB, positive fixed linear regulator, 12 V output, 1.5 A, TO-263-4 D²Pak surface-mount package, 72 dB PSRR at 120 Hz.

$1.9700Ref. price · indicative, final on quote
Texas Instruments LM7812SX/NOPB datasheet (PDF)
PackagingTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM7812SX/NOPB specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input35V
Voltage dropout2V @ 1A
Voltage - output (Min (Fixed))12V
Output current1.5A
Current - quiescent8 mA
Operating temperature0°C~125°C
PSRR72dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
Protection featuresOver Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

12 V fixed rail, 1.5 A continuous — surface-mount 7812

The LM7812SX/NOPB is a positive fixed-output linear regulator delivering 12 V at up to 1.5 A from a maximum input of 35 V. The 72 dB PSRR at 120 Hz means it cleans up rectified mains ripple well enough for sensitive analog loads without a post-filter.

Dropout headroom and quiescent current

Maximum dropout is 2 V at 1 A load — the input rail must stay above 14 V to maintain regulation at full current. Quiescent current runs 8 mA, which is typical for a 1.5 A linear regulator and factors into standby power on always-on rails.

Active lifecycle, surface-mount package

Frequently asked questions

Is LM7812SX/NOPB a direct replacement for the through-hole LM7812CT?

Electrically yes — same 12 V fixed output, 1.5 A rating, same protection features. The difference is the package: LM7812CT is TO-220 through-hole; LM7812SX/NOPB is TO-263 surface-mount. The tab on both carries the output voltage, but the TO-263 footprint is different and requires a reflow profile, not a solder iron.

Does LM7812SX/NOPB include overcurrent and thermal protection?

Yes — the datasheet lists over-temperature shutdown and short-circuit current limiting as built-in protection features. No external sense resistor or crowbar needed.