RT9013-18GB 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	Supply input. Operating range 2.2 V to 5.5 V (6 V absolute max). Bypass with a 1 uF ceramic (X7R) capacitor to GND close to the pin for stability.
2	GND	power_in	Common ground return for the regulator. Serves as the reference for VOUT and EN thresholds.
3	EN	input	Enable input, active high. VIH >= 1.6 V turns the regulator on; VIL <= 0.6 V (or EN = 0 V) puts the device in shutdown (typ 0.7 uA). Do not leave floating; tie high or drive with a logic signal. Absolute max 6 V.
4	NC	unconnected	No internal connection. May be left floating or tied to GND.
5	VOUT	power_out	Regulated output. Fixed 1.8 V for RT9013-18 option, +/-2% accuracy at 10 mA load, 500 mA maximum. Requires only a 1 uF ceramic (X7R) output capacitor for stability.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

RT9013-18GBB
RT9013-18GBU5
RT9013-18GBY
RT9013-18GBQW

CAD (KiCad official)

Symbol: RT9013-18GB
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
`rt9013-18gb.step`	85 KB	You want the bare part, or you mark your own boards.
`rt9013-18gb-etched.step`	2.2 MB	You want the part with `RT9013-18GB` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 539 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 (13 pp, sha256 15023cfb98e4146e, 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