KF50BD-TR from STMicroelectronics, in a SOIC-8-150mil. 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	VOUT	power_out	Regulated 5 V output. Requires a 2.2 µF (min) bypass capacitor with ESR 0.1 to 10 Ω for stability. Delivers up to 500 mA with internal current and thermal limiting.
2	GND	power_in	Ground return. Tie to system ground plane; used together with the other GND pins for heat conduction on SO-8.
3	GND	power_in	Ground return. Tie to system ground plane; used together with the other GND pins for heat conduction on SO-8.
4	NC	unconnected	No internal connection. Leave floating or tie to ground.
5	INHIBIT	input	TTL-compatible shutdown control input. Logic high (>= 2 V) enables the regulator (ON mode); logic low (<= 0.8 V) puts the device in standby (OFF mode, ~50 µA quiescent). Input current ~10 µA at VC = 6 V.
6	GND	power_in	Ground return. Tie to system ground plane; used together with the other GND pins for heat conduction on SO-8.
7	GND	power_in	Ground return. Tie to system ground plane; used together with the other GND pins for heat conduction on SO-8.
8	VIN	power_in	Unregulated DC input, absolute max -0.5 to 20 V; operating input up to 20 V. Recommend a 0.1 µF input decoupling capacitor. For the 5 V variant, minimum VI for 500 mA regulation is ~6.3 V (VO + dropout).

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOIC-8-150mil
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

KF50BD-TR
KF50BD-TRBDT-TR

CAD (KiCad official)

Symbol: KF50BD-TR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8-150mil (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`kf50bd-tr.step`	122 KB	You want the bare part, or you mark your own boards.
`kf50bd-tr-etched.step`	1.8 MB	You want the part with `KF50BD-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 450 faces against 147 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 (21 pp, sha256 a683c58723f09c6f, 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