component

SMAJ28A-JSM

Public Made by Adom

by adom

JSMSEMI ESD And Surge Protection (TVS/ESD), SMA. 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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SMAJ28A-JSM

JSMSEMI · ESD And Surge Protection (TVS/ESD) · SMA

SMAJ28A-JSM from JSMSEMI, 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 Cathode passive Cathode of the unidirectional TVS diode; connect to the protected line, which is positive relative to the anode (SMAJ28A: VRWM 28 V, VBR 31.1-34.4 V at 1 mA, VC max 45.4 V).
2 Anode passive Anode of the unidirectional TVS diode; connect to ground or the return side of the protected line.

Key specifications

Parameter Value
Manufacturer JSMSEMI
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 VBR 31.3 34.4 V @ IT = 1 mA 2
Reverse standoff voltage VRWM 28 V 2
Max clamping voltage VC_MAX 45.4 V @ IPP = 8.8 A 2
Max peak pulse current IPP_MAX 8.8 A 2
Test current IT 1 mA 2
Peak power dissipation PPPM 400 W 10/1000μs waveform, TA = 25°C 1
Thermal resistance junction to ambient RθJA 70 °C/W Mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad 1
Thermal resistance junction to case RθJC 25 °C/W Mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad 1
Thermal resistance junction to lead RθJL 30 °C/W Mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad 1
Operating junction and storage temperature range TJ, TSTG -55 150 °C 1

CAD (KiCad official)

  • Symbol: SMAJ28A-JSM
  • Footprint: Diode_SMD:D_SMA
  • 3D model: SMA (KiCad packages3D, STEP)
  • 3D model files: smaj28a-jsm-etched.step / smaj28a-jsm-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smaj28a-jsm.step / smaj28a-jsm.glb are the bare package body.

Provenance

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

  • Datasheet: JSMSEMI datasheet (5 pp, sha256 070cf4c2f9c4dec1, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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