LM2594M-5.0 from HGSEMI, in a SOP-8. 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	NC	unconnected	No connection. Leave floating or tie to ground plane per layout preference; not internally bonded.
2	NC	unconnected	No connection. Leave floating or tie to ground plane per layout preference; not internally bonded.
3	NC	unconnected	No connection. Leave floating or tie to ground plane per layout preference; not internally bonded.
4	Feedback	input	Feedback pin (FB). Senses the output voltage through an external resistor divider and regulates it against the internal 1.23 V reference. On fixed-output versions (5.0V variant) this pin ties directly to the regulated output node.
5	ON/OFF	input	Enable / shutdown input with hysteresis. Drive low (< 0.8 V) to enable the regulator, drive high (> 1.4 V) to shut down. Absolute max 25 V. Floating defaults low (enabled). Input leakage 0.2-15 µA depending on state.
6	GND	power_in	Ground return for the device. Must be placed outside the Schottky-diode-to-output-capacitor ground path to prevent switching-current spikes from inducing voltage noise into the LM2594(HV).
7	VIN	power_in	Supply voltage input. Operates from 4.5 V to 40 V DC (4.5 V to 60 V for the HV variant). Bypass VIN to GND with a suitably large low-ESR capacitor (e.g., 470 µF/35 V for a 12 V input) to eliminate input-line noise.
8	Output	output	Power switch output pin (SW). Internal NPN switch node that supplies power to the external inductor / Schottky catch diode / output capacitor network. Saturation voltage ~1.2 V at 1.5 A load. Rated for 1.5 A continuous.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

LM2594M-5.0

CAD (KiCad official)

Symbol: LM2594M-5.0
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm2594m-5-0.step`	122 KB	You want the bare part, or you mark your own boards.
`lm2594m-5-0-etched.step`	2.0 MB	You want the part with `LM2594M-5.0` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 506 faces against 147 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: HGSEMI datasheet (17 pp, sha256 b4935ffaa609c227, 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