LM2576HVS-3.3 from UMW, in a TO-263-5. 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	VIN	power_in	Unregulated DC input supply. Operating range 4.5 V to 60 V for the HV version (absolute max 63 V). Requires a low-ESR input bypass capacitor to ground.
2	Output	output	Switching output from the internal 3 A power switch. Connects to the external catch diode (e.g. 1N5822) and to the LC filter (typ. 100 µH inductor, 1000 µF output cap) that produces the regulated 3.3 V rail.
3	GND	power_in	Device ground and return for the input/output capacitors. Also serves as the thermal path via the TO-263 tab.
4	Feedback	input	Output voltage feedback input to the internal error amplifier. On the fixed 3.3 V version, tie directly to the regulated output node; the internal divider sets Vout = 3.3 V (±4% over line/load).
5	ON/OFF	input	Active-low TTL shutdown input. Low or floating enables the regulator; drive high (up to VIN, min -0.3 V) to place the device in low-power standby (~50 µA typ.).

Key specifications

Parameter	Value
Manufacturer	UMW
Package	TO-263-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

LM2576HVS-3.3S
LM2576HVS-3.3
LM2576HVS-3.3T

CAD (KiCad official)

Symbol: LM2576HVS-3.3
Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
3D model: TO-263-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm2576hvs-3-3.step`	180 KB	You want the bare part, or you mark your own boards.
`lm2576hvs-3-3-etched.step`	2.2 MB	You want the part with `LM2576HVS-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: 575 faces against 135 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 (18 pp, sha256 10275fb18a78ad8b, 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