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LM1086S-3.3

Public Unreviewed

by Ray

HGSEMI LM1086S 3 3 TR Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-263-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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LM1086S-3.3

HGSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-3

LM1086S-3.3 from HGSEMI, in a TO-263-3. 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 GND power_in Ground reference for the regulator. On the fixed-output LM1086-3.3 variant this pin is the device ground return (labeled GND/ADJ in the datasheet; on the adjustable version the same pin becomes the ADJ feedback input).
2 VOUT power_out Regulated 3.3V output. Delivers up to 1.5A of load current. Requires a bypass capacitor (typically 22uF tantalum) at the output for stability.
3 VIN power_in Unregulated input supply. Recommended input voltage up to 15V (absolute maximum 20V). For the 3.3V variant, VIN must be at least ~4.75V for full-load regulation. A 10uF input bypass capacitor is recommended.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package TO-263-3
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LM1086S-3.3/TR
  • LM1086S-5.0/TR
  • LM1086T-3.3
  • LM1086MDT-3.3/TR
  • LM1086MDT-5.0/TR

The extractor listed these alongside LM1086S-3.3, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LM1086S-ADJ/TR
  • LM1086T-ADJ
  • LM1086T-5.0
  • LM1086MDT-ADJ/TR

CAD (KiCad official)

  • Symbol: LM1086S-3.3
  • Footprint: Package_TO_SOT_SMD:TO-263-2
  • 3D model: TO-263-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm1086s-3-3.step 108 KB You want the bare part, or you mark your own boards.
lm1086s-3-3-etched.step 2.0 MB You want the part with LM1086S-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: 508 faces against 79 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 (10 pp, sha256 dfb3a1beb0eaf5a6, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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