component
SMBJ18A-Q
Public Made by Adomby adom
BOURNS TVS, SMB(DO-214AA). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownSMBJ18A-Q
BOURNS · TVS · SMB(DO-214AA)
SMBJ18A-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 | 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 | BOURNS |
| Package | SMB(DO-214AA) |
| 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 |
|---|---|---|---|---|---|---|---|
| Minimum Peak Pulse Power Dissipation | PPK | 600 | Watts | TP = 1 ms, TA = 25 °C | 1 | ||
| Peak Forward Surge Current | IFSM | 100 | Amps | 8.3 ms single half sine wave superimposed on rated load (JEDEC method) | 1 | ||
| Operating Temperature Range | TJ | -55 | 150 | °C | 1 | ||
| Storage Temperature Range | TSTG | -55 | 150 | °C | 1 | ||
| Breakdown Voltage | VBR | 20 | 22.1 | V | @ IT = 1.0 mA, TA = 25 °C | 2 | |
| Working Peak Reverse Voltage | VRWM | 18 | V | TA = 25 °C | 2 | ||
| Maximum Reverse Leakage | IR | 1 | μA | @ VRWM = 18 V | 2 | ||
| Maximum Clamping Voltage (10/1000 µs) | Vc | 29.2 | V | @ Ipp (10/1000 µs) = 20.6 A | 2 | ||
| Maximum Peak Pulse Current (10/1000 µs) | Ipp | 20.6 | A | 10/1000 µs | 2 | ||
| Maximum Clamping Voltage (8/20 µs) | Vc | 38 | V | @ Ipp (8/20 µs) = 103.0 A | 2 | ||
| Maximum Peak Pulse Current (8/20 µs) | Ipp | 103 | A | 8/20 µs | 2 | ||
| Breakdown Voltage Tolerance | -5 | 5 | % | Suffix A = 5 % tolerance unidirectional device | 4 |
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:
SMBJ18A-Q - Footprint:
Diode_SMD:D_SMB - 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
- 3D model files:
smbj18a-q-etched.step/smbj18a-q-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smbj18a-q.step/smbj18a-q.glbare 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, primarytwo-terminal convention(convention), consensusoff(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).