component

L7912 Negative Voltage Regulator

Public Made by Adom

by adom

Fixed -12 V negative-voltage linear regulator, up to 1.5 A, in the L79xx series.

regulatorlinearnegativefixedpmicstto-220
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3D Model

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Schematic Symbol

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Datasheet

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Contents

README

markdown

L7912

STMicroelectronics · Linear Regulator (LDO) · TO-220

The L7912 is a three-terminal fixed negative-voltage regulator from ST's L79xx series, delivering a stable -12 V output at up to 1.5 A with adequate heat sinking. It pairs with a positive 78xx regulator to build split (dual-rail) supplies for op-amps and analog circuits, and needs only input and output capacitors.

Pinout

Pin Name Type Function
1 GND power_in Common / ground reference for the regulator. For negative regulators this is the 0 V node; the output produces a -12 V rail with respect to this pin.
2 IN power_in Unregulated negative input voltage (VI). Must be more negative than the output by at least the dropout voltage (~1.1 V typ). Absolute maximum -35 V. Requires a 2.2 µF input capacitor (CI) close to the pin per the recommended test circuit.
3 OUT power_out Regulated -12 V output (VO), up to 1.5 A with adequate heat sinking. Tolerance is 2% (AC version) or 4% (C version) at 25 °C. Requires a 1 µF output capacitor (CO) for stability per the recommended test circuit.

Key specifications

Parameter Value
Type Fixed negative linear regulator
Output voltage -12 V
Output current Up to 1.5 A (with heatsink)
Line/load regulation Internally set
Package TO-220 (3-lead)
Operating temperature 0 C to 125 C (junction)

Ordering variants

Same part, different packaging or reel option.

  • L7912CV
  • L7912ACV
  • L7912CP
  • L7912ACP
  • L7912D2T
  • L7912CD2T

CAD (KiCad official)

  • Symbol: l7912.kicad_sym
  • Footprint: l7912.kicad_mod
  • 3D model: TO-220 body from KiCad Package_TO_SOT_THT/TO-220-3_Vertical.
  • 3D model files: l7912-etched.step / l7912-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); l7912.step / l7912.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (29 pp, sha256 6bdb1e0a1c61a10d, 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