LM2931
Public Made by Adomby adom
TI automotive low-dropout regulator, TO-220. 100 mA, load-dump and reverse-battery protected, low quiescent. Datasheet-verified.
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markdownLM2931
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2931.step/lm2931.glbare 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).