SSP7903P30JR from Shanghai Siproin Microelectronics, in a TO-252. 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	Unregulated positive supply input. Absolute maximum 40 V (min -0.3 V); minimum operating input 2.2 V. Bypass to GND with a 10 µF (typ. 2.2 µF-4.7 µF) capacitor placed close to the pin.
2	GND	power_in	Ground reference for the regulator. In the TO-252 package this pin is electrically tied to the exposed heat-slug tab; use a single-point ground return to keep load-regulation error low. Quiescent current 1.6 µA typ.
3	VOUT	power_out	Regulated positive output. Fixed voltage set by ordering suffix ①② (3.0 V for the -30 variant); tolerance ±2%, dropout 20 mV @ 10 mA (1000 mV @ 1 A), max continuous output current 1 A, current-limit typ. 1.8 A, short-circuit current typ. 120 mA. Requires a 10 µF (typ. 2.2 µF-4.7 µF) output capacitor.

Key specifications

Parameter	Value
Manufacturer	Shanghai Siproin Microelectronics
Package	TO-252
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

SSP7903P30JRJ
SSP7903P30JRP
SSP7903P30JRPB
SSP7903P30JRF
SSP7903P30JRFB

CAD (KiCad official)

Symbol: SSP7903P30JR
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Shanghai Siproin Microelectronics datasheet (11 pp, sha256 d1763cb71baebbea, 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