component

SMAJ28AJ

Public Made by Adom

by adom

WeEn Semiconductors ESD And Surge Protection (TVS/ESD), SMA. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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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SMAJ28AJ

WeEn Semiconductors · ESD And Surge Protection (TVS/ESD) · SMA

SMAJ28AJ from WeEn Semiconductors, in a SMA. 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 K passive Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2 A passive Anode.

Key specifications

Parameter Value
Manufacturer WeEn Semiconductors
Package SMA
Category Circuit 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) VBR 31.33 V IT = 1 mA 2
Breakdown voltage (max) VBR 34.16 V IT = 1 mA 2
Max. clamping voltage VC 45.4 V @ Ipp = 8.8 A 2
Max. peak pulse current Ipp 8.8 A 2
Maximum reverse leakage IR 1 μA @ VR = 28 V 2
Peak pulse power PPPM 400 W 10/1000 μs waveform, IEC 61643-321 [1] 1
Steady state power dissipation PM(AV) 3.3 W steady state, infinite heatsink, Ta = 50 °C 1
Peak forward surge current IFSM 60 A tp = 8.3 ms; single half sine-wave pulse; duty cycle = 4 pulses per minute maximum; unidirectional units only 1
Forward on-state voltage VF 3.5 V IF = 35 A; unidirectional units only 1
Storage temperature range Tstg -65 150 °C 1
Operating temperature range Tj -65 150 °C 1

CAD (KiCad official)

  • Symbol: SMAJ28AJ
  • Footprint: Diode_SMD:D_SMA
  • 3D model: SMA (KiCad packages3D, STEP)
  • 3D model files: smaj28aj-etched.step / smaj28aj-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smaj28aj.step / smaj28aj.glb are the bare package body.

Provenance

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

  • Datasheet: WeEn Semiconductors datasheet (7 pp, sha256 17c388c201e50792, retrieved 2026-10-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band 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