component

LM2576S-12

Public Made by Adom

by adom

HGSEMI DC-DC Converters, TO-263-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs lm2576s-12: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STE… · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
lm2576s-12-etched.fit.json lm2576s-12: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm2576s-12-etched.glb lm2576s-12: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STE… · Ray
lm2576s-12-etched.step lm2576s-12: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STE… · Ray
lm2576s-12.glb fix footprint: TO-263-2 -> TO-263-5_TabPin6 (pad_count, 5 pins) · Ray
lm2576s-12.kicad_mod fix footprint: TO-263-2 -> TO-263-5_TabPin6 (pad_count, 5 pins) · Ray
lm2576s-12.kicad_sym add symbol pin "6" for the exposed thermal pad: the footprint carries the pad and the symbol had none, so it reached no… · Ray
lm2576s-12.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
lm2576s-12.step fix footprint: TO-263-2 -> TO-263-5_TabPin6 (pad_count, 5 pins) · Ray
package.json Publish 0.2.0 · Ray
pads.json add symbol pin "6" for the exposed thermal pad: the footprint carries the pad and the symbol had none, so it reached no… · Ray
page.json lm2576s-12: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STE… · Ray
README.md lm2576s-12: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

LM2576S-12

HGSEMI · DC-DC Converters · TO-263-5

LM2576S-12 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 Unregulated DC input supply. Operating range 15V-40V for LM2576 (up to 60V for LM2576HV). Bypass with a low-ESR 100µF electrolytic close to the pin.
2 Output power_out Switching output from the internal 3A NPN power switch. Connect to the catch Schottky diode (e.g. 1N5822) cathode and the LC output filter (typ. 100µH + 1000µF) that produces the regulated 12V rail.
3 Ground power_in Device power ground / signal return. Electrically common with the exposed TAB (tab is GND) - solder both to the ground plane for the thermal path.
4 Feedback input Regulation feedback input to the internal error amplifier. For the fixed 12V version, tie directly to the +12V output node; the internal divider sets the 1.23V bandgap reference for regulation. Bias current ~50nA (500nA max).
5 ON/OFF input Active-low TTL-compatible shutdown input. Logic LOW (VIL ≤ 1.0V) or grounded = regulator ON; logic HIGH (VIH ≥ 2.2V, up to VIN) = shutdown (~50µA standby current). Do not leave floating; tie to GND for always-on operation.
TAB GND passive Exposed metal tab, internally connected to pin 3 (Ground). Provides the primary thermal path (RθJC(bot) ≈ 0.4°C/W); solder to a copper ground pour sized for the required θJA.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package TO-263-5
Category PMIC
Pins 6

Ordering variants

Same part, different packaging or reel option.

  • LM2576S-12/TR
  • LM2576HVS-12/TR
  • LM2576T-12
  • LM2576HVT-12
  • LM2576TB-12
  • LM2576M-12/TR
  • LM2576ME-12/TR
  • LM2576DQ4-12/TR

CAD (KiCad official)

  • Symbol: LM2576S-12
  • Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
  • 3D model: TO-263-5 (KiCad packages3D, STEP)
  • 3D model files: lm2576s-12-etched.step / lm2576s-12-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2576s-12.step / lm2576s-12.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm2576s-12.step 180 KB You want the bare part, or you mark your own boards.
lm2576s-12-etched.step 1.9 MB You want the part with LM2576S-12 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 501 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 (14 pp, sha256 eddc94f04fe787be, 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