LM2576S-5.0 from HGSEMI, 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	Input supply voltage. Operating range 4.5V to 40V for LM2576 (up to 60V for LM2576HV). Absolute maximum 45V (63V HV). Bypass with a suitable input capacitor close to this pin.
2	Output	output	Switching output from the internal 3A power switch. Connects to the external catch diode (e.g. 1N5822) and the smoothing inductor (typ. 100µH). Steady-state output voltage may swing down to -1V relative to GND.
3	GND	power_in	Device ground reference for the internal regulator, oscillator, error amplifier, and power switch return.
4	Feedback	input	Output voltage feedback input to the internal error amplifier. On fixed-voltage versions (like the -5.0), tie directly to the regulated output node so the internal divider senses VOUT (internal 1.23V band-gap reference).
5	ON/OFF	input	TTL-compatible active-low shutdown input. Low or floating enables the regulator; drive high to enter low-power standby mode (~50µA typ). Input range -0.3V to +VIN.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LM2576S-5.0S
LM2576S-5.0T

CAD (KiCad official)

Symbol: LM2576S-5.0
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
`lm2576s-5-0.step`	180 KB	You want the bare part, or you mark your own boards.
`lm2576s-5-0-etched.step`	2.0 MB	You want the part with `LM2576S-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: 536 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: HGSEMI 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