H8118A50M5R from Shanghai Siproin Microelectronics, 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	EN	input	Chip-enable / shutdown input. Drive high (VSH >= 0.75 V) for normal step-up operation; drive low (VSL1 <= 0.3 V) to stop switching and enter shutdown (ISSS <= 1.0 uA at VEN=0V). Absolute max VSS-0.3 V to VSS+8 V; leakage +/-0.1 uA.
2	VOUT	power_out	Regulated boost output pin. Delivers the factory-programmed output voltage (2.1-5.5 V in 0.1 V steps, +/-2% accuracy) to the external output capacitor. Also serves as the feedback sense node for the internal error amplifier. Absolute max VSS-0.3 V to VSS+8 V.
3	NC	unconnected	No connection. Leave floating or tie to a stationary net; not internally bonded.
4	GND	power_in	Device ground / VSS return. All voltages are referenced to this pin.
5	LX	passive	Switching node for the external boost inductor. Connect the inductor between VIN and LX. Internal MOSFET switches this node; peak current is limited to ILX = 1000 mA and an over-voltage protection turns the FET off when VLX exceeds the absolute maximum (VSS-0.3 V to VSS+8 V).

Key specifications

Parameter	Value
Manufacturer	Shanghai Siproin Microelectronics
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

H8118A50M5R
H8118A50M5RM5G
H8118A50M5RPR
H8118A50M5RPG

CAD (KiCad official)

Symbol: H8118A50M5R
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
`h8118a50m5r.step`	85 KB	You want the bare part, or you mark your own boards.
`h8118a50m5r-etched.step`	2.2 MB	You want the part with `H8118A50M5R` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 541 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: Shanghai Siproin Microelectronics datasheet (6 pp, sha256 b86cbaa950a423ac, retrieved 2026-08-17, tier: lcsc)
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