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L7905 Negative Voltage Regulator

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by Ray

Fixed -5 V negative-voltage linear regulator, up to 1.5 A, in the L79xx series.

regulatorlinearnegativefixedpmicstto-220
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L7905

STMicroelectronics · Linear Regulator (LDO) · TO-220

The L7905 is a three-terminal fixed negative-voltage regulator from ST's L79xx series, delivering a stable -5 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 / reference ground for both input and output. The output voltage is regulated with respect to this pin.
2 IN power_in Unregulated negative supply input. Accepts DC input voltage down to -35 V (abs. max). A 2.2 µF input capacitor (CI) to GND is recommended to reject line transients. In the TO-220 / TO-220FP / D²PAK packages the mounting tab is internally connected to this pin.
3 OUT power_out Regulated negative output. Delivers a fixed -5 V (typ.) with respect to GND at up to 1.5 A when adequately heat-sunk. A 1 µF output capacitor (CO) to GND is required for stability.

Key specifications

Parameter Value
Type Fixed negative linear regulator
Output voltage -5 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.

  • L7905CV
  • L7905ACV
  • L7905CP
  • L7905ACP
  • L7905CD2T
  • L7905ACD2T

CAD (KiCad official)

  • Symbol: l7905.kicad_sym
  • Footprint: l7905.kicad_mod
  • 3D model: TO-220 body from KiCad Package_TO_SOT_THT/TO-220-3_Vertical.

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