component

SMF78CA

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Liown Electrostatic And Surge Protection (TVS/ESD), SOD-123FL. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.

componenttvs-fuse-board level protectionsmf78cafactory-2.0.0extractor-text

Verified SMF78CA

by Ray · last 4 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

4 Nov 2026RayPublished by the parts factory: tier lcsc, 2 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: SMF78CA · SOD-123FL · 2 pins
  • ✓copper: 2 copper pads, none touching another net
  • ✓datasheet: unpolarised two-terminal part: pins 1 and 2 by library convention, no names to check
  • ✓distributor: lcsc C53278404, digikey 2721-SMF78CATR-ND, mouser 576-SMF78CA
  • ✓family: D_SOD-123F
  • ✓files: 6 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-yduiiprv/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 1 records
  • ✓package_fit: height and body within the datasheet's package drawing (datasheet p.5)
  • ✓pads: 2 pins = 2 pads
  • ✓pose: 1 STEP(s) Z-up, seated, centred
  • ✓symbol: 2 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ smf78ca.kicad_sym✓ smf78ca.kicad_mod✓ smf78ca.step
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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 5d ago
viewers smf78ca: viewers · Ray 5d ago
package.json Publish 0.1.0 · Ray 5d ago
page.json Set visibility: public · Ray 5d ago
README.md Publish 0.1.0 · Ray 5d ago
smf78ca-hero.glb Publish 0.1.0 · Ray 5d ago
smf78ca-hero.overlay.json Publish 0.1.0 · Ray 5d ago
smf78ca.glb Publish 0.1.0 · Ray 5d ago
smf78ca.kicad_mod Publish 0.1.0 · Ray 5d ago
smf78ca.kicad_sym Publish 0.1.0 · Ray 5d ago
smf78ca.lbr Publish 0.1.0 · Ray 5d ago
smf78ca.step Publish 0.1.0 · Ray 5d ago
verification.json Verified: Published by the parts factory: tier lcsc, 2 pins · Ray 5d ago

SMF78CA

Liown · Electrostatic And Surge Protection (TVS/ESD) · SOD-123FL

SMF78CA from Liown, in a SOD-123FL. 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 1 passive Terminal 1 of an unpolarised fuse; either orientation.
2 2 passive Terminal 2 of an unpolarised fuse; either orientation.

Key specifications

Parameter Value
Manufacturer Liown
Package SOD-123FL
Category TVS/Fuse/Board Level Protection
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Breakdown voltage (min), bidirectional SMF78CA VB 86.7 V @ IT = 1 mA 2
Breakdown voltage (max), bidirectional SMF78CA VB 95.8 V @ IT = 1 mA 2
Maximum clamping voltage, bidirectional SMF78CA VC 126 V @ IPP = 1.6 A 2
Reverse leakage current, bidirectional SMF78CA IR 1 µA @ VR = 78 V 2
Peak pulse power dissipation, 10/1000 µs waveform PPPM 200 W 10/1000μs waveform (Note1, Note2, Fig.1) 1
Peak pulse power, 8/20 µs waveform PPPM 1000 W tp=8/20μs waveform 1
Steady state power dissipation PM(AV) 1 W TL=75℃ (Fig.5) 1
Peak forward surge current IFSM 20 A 8.3ms single half sine-wave superimposed on rated load, (JEDEC Method) (Note3, Fig.6) 1
Operating junction and storage temperature range TJ、TSTG -55 150 ℃ 1
Typical thermal resistance, junction to lead RθJL 100 ℃/W 1
Typical thermal resistance, junction to ambient RθJA 220 ℃/W 1

CAD (KiCad official)

  • Symbol: SMF78CA
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123FL (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Liown datasheet (6 pp, sha256 1a9bdebdaaf8c693, retrieved 2026-11-04, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary two-terminal convention (convention), consensus off (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