RT9193-33GB from Richtek Tech, in a SOT-23-5. 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	VIN	power_in	Power input voltage. Recommended operating range 2.5V to 5.5V (6V absolute max). Bypass with a 1uF X7R capacitor to GND close to the pin.
2	GND	power_in	Ground return for the regulator. Provides the reference for VIN, VOUT and the internal reference.
3	EN	input	Chip Enable (active-high, TTL-logic). Input range 0V to 5.5V; VIH >= 1.2V to enable, VIL <= 0.4V for shutdown. This pin is high impedance - add a ~100 kOhm pull-down to GND when the drive signal may float.
4	BP	passive	Reference noise bypass. May be left floating; for lowest output noise (typ 100 uVrms), connect a 22nF capacitor from BP to GND.
5	VOUT	power_out	Regulated output voltage (3.3V for the -33 option), 300mA max. Requires only a 1uF X7R output capacitor for stability; low-ESR ceramics acceptable.

Key specifications

Parameter	Value
Manufacturer	Richtek Tech
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

RT9193-33GBB
RT9193-33GBU5
RT9193-33GBJ5
RT9193-33GBQW
RT9193-33GBF

CAD (KiCad official)

Symbol: RT9193-33GB
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rt9193-33gb.step`	85 KB	You want the bare part, or you mark your own boards.
`rt9193-33gb-etched.step`	2.4 MB	You want the part with `RT9193-33GB` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 566 faces against 102 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: Richtek Tech datasheet (14 pp, sha256 bf255aae29036038, 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