component

L7809 9 V Linear Regulator

Public Unreviewed

by Ray

Fixed 9 V positive-voltage linear regulator, up to 1.5 A, in the L78xx (7800) series.

regulatorlinearfixedpositivepmicstto-220
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗

Symbol & Footprint

Schematic Symbol

Open full view ↗

PCB Footprint

Open full view ↗
Contents

README

markdown

L7809

STMicroelectronics · Linear Regulator (LDO) · TO-220

The L7809 is a three-terminal fixed positive-voltage regulator from ST's L78xx (7800) series, delivering a stable 9 V output at up to 1.5 A with adequate heat sinking. It is the classic linear regulator for powering logic and analog rails from a higher unregulated supply, needing only input and output capacitors.

Pinout

Pin Name Type Function
1 INPUT power_in Unregulated DC input. Absolute maximum 35 V (for VO = 5-18 V variants). Requires a 0.33 µF bypass capacitor close to the pin.
2 GROUND power_in Common ground reference. Also connected internally to the mounting tab on TO-220/TO-220FP and to the exposed pad on DPAK/D²PAK.
3 OUTPUT power_out Regulated +9 V output, up to 1.5 A with adequate heatsinking. Requires a 0.1 µF output capacitor for stability.

Key specifications

Parameter Value
Type Fixed positive linear regulator
Output voltage 9 V
Output current Up to 1.5 A (with heatsink)
Dropout voltage 2 V typ
Package TO-220 (3-lead)
Operating temperature 0 C to 125 C (junction)

Ordering variants

Same part, different packaging or reel option.

  • L7809CV
  • L7809CP
  • L7809CDT
  • L7809CDT-TR
  • L7809CD2T
  • L7809CD2T-TR

CAD (KiCad official)

  • Symbol: l7809.kicad_sym
  • Footprint: l7809.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 (55 pp, sha256 ccba643d1b7ced87, 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