component

SMBJ28A-Q

Public Made by Adom

by adom

BOURNS TVS, SMB(DO-214AA). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SMBJ28A-Q

BOURNS · TVS · SMB(DO-214AA)

SMBJ28A-Q from BOURNS, in a SMB(DO-214AA). 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 terminal, marked by the cathode band on the unidirectional SMBJ28A-Q (VRWM 28 V, VBR 31.1-34.4 V at 1 mA, max clamping 45.4 V at 13.3 A, 10/1000 µs).
2 A passive Anode terminal, the unmarked end opposite the cathode band of the unidirectional SMBJ28A-Q.

Key specifications

Parameter Value
Manufacturer BOURNS
Package SMB(DO-214AA)
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 31.1 34.4 V @ IT = 1.0 mA, TA = 25 °C 2
Test Current IT 1 mA breakdown voltage test current 2
Working Peak Reverse Voltage VRWM 28 V 2
Maximum Reverse Leakage IR 1 µA @ VRWM 2
Maximum Clamping Voltage (10/1000 µs) Vc 45.4 V @ Ipp (10/1000 µs) 2
Maximum Peak Pulse Current (10/1000 µs) Ipp 13.3 A 10/1000 µs 2
Maximum Clamping Voltage (8/20 µs) Vc 59 V @ Ipp (8/20 µs) 2
Maximum Peak Pulse Current (8/20 µs) Ipp 66.5 A 8/20 µs 2
Breakdown Voltage Tolerance -5 5 % Suffix A denotes 5 % tolerance unidirectional device 2
Minimum Peak Pulse Power Dissipation PPK 600 Watts TP = 1 ms (Note 1,2) 1
Peak Forward Surge Current IFSM 100 Amps 8.3 ms single half sine wave superimposed on rated load (JEDEC method) (Note 3) 1
Operating Temperature Range TJ -55 150 °C 1
Storage Temperature Range TSTG -55 150 °C 1

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts copper 2. Mounted on 5.0 mm2 (0.03 mm thick) copper pads to each terminal. 1

CAD (KiCad official)

  • Symbol: SMBJ28A-Q
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
  • 3D model files: smbj28a-q-etched.step / smbj28a-q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smbj28a-q.step / smbj28a-q.glb are the bare package body.

Provenance

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

  • Datasheet: BOURNS datasheet (6 pp, sha256 fd33918f2c178a02, retrieved 2026-10-23, 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