H8118A33M5R 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 pin. Drive high (VSH >= 0.75 V) for normal step-up operation; drive low (VSL1 <= 0.3 V) to shut the converter down (ISSS < 1 uA). Absolute max VSS-0.3 V to VSS+8 V.
2	VOUT	power_out	Regulated boost output voltage pin (3.3V for the '33' option, factory-set between 2.1 V and 5.5 V in 0.1 V steps). Also serves as the internal feedback sense node and supplies the IC. Connect the output capacitor (e.g. 47 uF tantalum) from this pin to GND.
3	NC	unconnected	No connection. Leave floating or tie to GND per PCB layout preference.
4	GND	power_in	Ground / VSS reference for the IC. All input and output capacitors return here.
5	LX	power_out	Switching node - external inductor connection. Connect the boost inductor (typ. 47 uH) from the input supply to this pin. Internal synchronous MOSFET switches this node; peak current is limited to ~1000 mA. Absolute max 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.

H8118A33M5R
H8118A33M5RM5G
H8118A33M5RPR
H8118A33M5RPG

CAD (KiCad official)

Symbol: H8118A33M5R
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

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