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SMPC33A-M3

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Vishay Intertech ESD And Surge Protection (TVS/ESD), TO-277A. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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SMPC33A-M3

Vishay Intertech · ESD And Surge Protection (TVS/ESD) · TO-277A

SMPC33A-M3 from Vishay Intertech, in a TO-277A. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Cathode 1 passive Cathode-side terminal 1 of the SMPC33A transient voltage suppressor, per the pinout drawing for the SMPCxxA variant; the datasheet states the cathode band marks the cathode end and that electrical characteristics apply only when two identical-polarity terminals are connected.
2 Anode Cathode 2 passive Terminal 2 is labelled 'Anode Cathode 2' in the pinout drawing, so its polarity is not stated unambiguously in the text and it should be confirmed against the drawing or manufacturer before layout.
3 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Vishay Intertech
Package TO-277A
Category Circuit Protection
Pins 3

CAD (KiCad official)

  • Symbol: SMPC33A-M3
  • Footprint: Package_TO_SOT_SMD:TO-277A
  • 3D model: TO-277A (KiCad packages3D, STEP)
  • 3D model files: smpc33a-m3-etched.step / smpc33a-m3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smpc33a-m3.step / smpc33a-m3.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Vishay Intertech datasheet (6 pp, sha256 632200d8d69aa343, retrieved 2026-10-12, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF