L7809CD2T-TR from STMicroelectronics, in a TO-263-2. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	INPUT	power_in	Unregulated DC input (V_I). Maximum 35 V for output voltages 5-18 V. Recommend a 0.33 uF ceramic bypass capacitor placed close to the pin to suppress high-frequency oscillations. For a 9 V output, V_I must be at least ~11.5 V (accounting for ~2 V dropout at 1 A).
2	GND	power_in	Common ground for input and output. Electrically connected to the exposed tab of the D2PAK package, which also serves as the primary thermal path to the PCB copper plane (R_thJC = 3 C/W).
3	OUTPUT	power_out	Regulated +9 V DC output (V_O). Typical accuracy 2% (A-version) or 4% (standard C). Deliver up to 1 A continuous (1.5 A peak) with adequate heat-sinking. A 0.1 uF output capacitor is recommended to improve transient response.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	TO-263-2
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

L7809CD2T-TR
L7809CD2T-TRCV
L7809CD2T-TRCP
L7809CD2T-TRCDT-TR
L7809CD2T-TRCDT

CAD (KiCad official)

Symbol: L7809CD2T-TR
Footprint: Package_TO_SOT_SMD:TO-263-2
3D model: TO-263-2 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`l7809cd2t-tr.step`	108 KB	You want the bare part, or you mark your own boards.
`l7809cd2t-tr-etched.step`	2.0 MB	You want the part with `L7809CD2T-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 502 faces against 79 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: STMicroelectronics datasheet (58 pp, sha256 48a781601decc4e4, 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