component

LM2931

Public Made by Adom

by adom

TI automotive low-dropout regulator, TO-220. 100 mA, load-dump and reverse-battery protected, low quiescent. Datasheet-verified.

componentpowerldolinear-regulatorautomotiveto-220texas-instruments
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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
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docs lm2931: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
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LM2931

Texas Instruments · LDO regulator · TO-220

Low-dropout regulator built to survive an automotive supply: it withstands load-dump transients to 60 V and a reverse-battery connection, and it holds regulation with less than 0.6 V of input-to-output headroom. The quiescent current stays low even near dropout, so it suits always-on car electronics running off the battery directly. It delivers 100 mA at a fixed 3.3 V (this option) or 5 V. A rugged linear regulator for 12 V automotive and industrial rails.

Pinout

Pin Name Type Function
1 IN power_in Unregulated input, operating range up to 26 V (survives 50 V load dump on LM2931-N, 60 V on LM2931A/C). A 0.1 µF bypass is required if the regulator is remote from the supply filter.
2 GND power_in Device ground / return. In TO-220 and DDPAK/TO-263, the tab is electrically connected to GND.
3 OUT power_out Regulated output. Delivers fixed 3.3 V or 5 V (±3.8% for A grade) at up to 100 mA. Requires ≥100 µF low-ESR output capacitor for stability.

Key specifications

Parameter Value
Type Low-dropout regulator (automotive)
Output current 100 mA
Dropout < 0.6 V
Transient survival Load dump to 60 V, reverse battery to -50 V
Quiescent current Low (~0.4 mA)
Output 3.3 V (fixed option)
Package TO-220

Ordering variants

Same part, different packaging or reel option.

  • LM2931T-3.3 (TO-220)
  • LM2931AT-5.0 (TO-220)
  • LM2931D (SOIC-8)

CAD (KiCad official)

  • Symbol: Regulator_Linear2:LM2931-3.3_TO220 (KiCad official)
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220 (KiCad packages3D, STEP)
  • 3D model files: lm2931-etched.step / lm2931-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2931.step / lm2931.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (35 pp, sha256 45c959192188b8f1, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF