SSP9461 from Shanghai Siproin Microelectronics, in a SOP-8-EP. 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	Input supply pin (4.5V to 60V, absolute max 62V). Powers all internal control circuits and the high-side MOSFET. Requires a decoupling capacitor to ground placed close to the pin to reduce switching spikes.
2	NC	unconnected	No connection. Leave floating or tie to ground per PCB layout preference.
3	EN	input	Enable input. Pull below the enable-off threshold (Venf ≈ 1.0V) to disable the converter; pull above the enable-on threshold (Venr ≈ 1.35V) to enable. Connect a 100kΩ resistor to VIN for automatic turn-on. EN input current is ~3.1μA at 2V and ~0.1μA at 0V.
4	FB	input	Feedback input to the internal error amplifier (reference 0.812V typ). Set the output voltage via a resistor divider from VOUT to FB. When FB drops below ~250mV (short-circuit), the reentry circuit reduces the switching frequency (~150kHz) for reliable current-limit protection.
5	NC	unconnected	No connection. Leave floating or tie to ground per PCB layout preference.
6	GND	power_in	Ground return for the IC. Should be connected as close as possible to the output capacitor return and avoid high-current switching paths. The ESOP-8 exposed thermal pad should be tied to this ground for improved heat dissipation.
7	BST	power_out	Bootstrap capacitor pin. Provides the floating positive supply for the internal high-side MOSFET gate driver. Connect a bypass capacitor (typ 100nF) between BST and SW. Absolute max BST-to-SW voltage is 6.0V.
8	SW	output	Switch node, drain of the internal high-side power MOSFET (1Ω RDS(on)). Connects to the external inductor and to a low-VF Schottky freewheeling diode to ground. Absolute max range −0.3V to VIN(MAX)+0.3V.

Key specifications

Parameter	Value
Manufacturer	Shanghai Siproin Microelectronics
Package	SOP-8-EP
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

SSP9461

CAD (KiCad official)

Symbol: SSP9461
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
3D model: SOP-8-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ssp9461.step`	193 KB	You want the bare part, or you mark your own boards.
`ssp9461-etched.step`	1.6 MB	You want the part with `SSP9461` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 382 faces against 63 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 (8 pp, sha256 555ed7ce759feb01, 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