LM2674M-3.3 from UMW, 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	CB	passive	Boost capacitance terminal. External bootstrap capacitor (typ. 10 nF / 103 50 V) connects between CB and VSW to develop the gate drive rail needed to fully enhance the internal high-side switch.
2	NC	unconnected	Empty port. No internal connection; leave floating or tie to a non-conducting net.
3	NC	unconnected	Empty port. No internal connection; leave floating or tie to a non-conducting net.
4	FB	input	Feedback control terminal. Senses the regulated output; for the fixed 3.3 V version this pin is tied directly to VOUT. Absolute rating: -0.3 V to VIN.
5	ON/OFF	input	Enable terminal with hysteresis: High = ON, Low = OFF. TTL-compatible shutdown input. VON(ON) min 1.5 V, VON(OFF) max 0.8 V; absolute range -0.3 V to 6 V. Shutdown current typ. 100 µA.
6	GND	power_in	Power supply ground terminal. Common return for the input supply, control circuitry, and internal power switch.
7	VIN	power_in	Positive terminal of power supply. Operating input voltage range 7 V-40 V, absolute maximum 45 V. Bypass locally with a 100 µF (typ.) input capacitor.
8	VSW	power_out	Power switch output terminal (SW). Connects to the external inductor and catch diode of the buck power stage. Absolute range -1 V to VIN.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LM2674M-3.3

CAD (KiCad official)

Symbol: LM2674M-3.3
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
`lm2674m-3-3.step`	122 KB	You want the bare part, or you mark your own boards.
`lm2674m-3-3-etched.step`	2.0 MB	You want the part with `LM2674M-3.3` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 496 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: UMW datasheet (14 pp, sha256 8da892f0ae83409e, 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