component
SMBJ18AQ
Public Made by Adomby adom
Yangzhou Yangjie Elec Tech ESD And Surge Protection (TVS/ESD), DO-214AA(SMB). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SMBJ18AQ
Yangzhou Yangjie Elec Tech · ESD And Surge Protection (TVS/ESD) · DO-214AA(SMB)
SMBJ18AQ from Yangzhou Yangjie Elec Tech, in a DO-214AA(SMB). 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, the end marked with the band on the uni-directional SMBJ18AQ (VRWM 18.0 V, VBR 20.00-22.10 V at 1 mA, VC 29.2 V at 20.6 A). |
| 2 | A | passive | Anode terminal, the unbanded end of the uni-directional SMBJ18AQ, which has no marking on this end. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | DO-214AA(SMB) |
| 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 | 20 | 22.1 | V | @ IT = 1 mA | 2 | |
| Test current | IT | 1 | mA | Pulse test: tp≤50ms | 2 | ||
| Maximum reverse leakage | IR | 1 | μA | @ VRWM | 2 | ||
| Working peak reverse voltage | VRWM | 18 | V | 2 | |||
| Maximum reverse surge current | IPP | 20.6 | A | Surge current waveform per Fig.3 and derated per Fig.2 | 2 | ||
| Maximum clamping voltage | Vc | 29.2 | V | @ IPP | 2 | ||
| Maximum instantaneous forward voltage | VF | 3.5 | V | at 50A for unidirectional only | 1 | ||
| Peak pulse power dissipation | PPPM | 600 | W | with a 10/1000us waveform | 1 | ||
| Power dissipation | PD | 5 | W | on infinite heat sink at TL=75℃ | 1 | ||
| Peak forward surge current | IFSM | 100 | A | 8.3 ms single half sine-wave unidirectional only | 1 | ||
| Operating junction temperature | TJ | -55 | 175 | ℃ | 1 | ||
| Storage temperature range | TSTG | -55 | 175 | ℃ | 1 | ||
| Thermal resistance junction to lead | RθJL | 20 | ℃/W | junction to lead | 3 | ||
| Thermal resistance junction to ambient | RθJCA | 100 | ℃/W | junction to Ambient | 3 |
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 |
|---|---|---|---|---|
| housing | black | 4. Body color: Black | 3 | |
| contacts | tin | ● Terminals: Matte tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |
CAD (KiCad official)
- Symbol:
SMBJ18AQ - Footprint:
Diode_SMD:D_SMB - 3D model: DO-214AA(SMB) (KiCad packages3D, STEP)
- 3D model files:
smbj18aq-etched.step/smbj18aq-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smbj18aq.step/smbj18aq.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Yangzhou Yangjie Elec Tech datasheet (6 pp, sha256
c01aa656ef4102c3, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).
# SMBJ18AQ
**Yangzhou Yangjie Elec Tech** · ESD And Surge Protection (TVS/ESD) · DO-214AA(SMB)
SMBJ18AQ from Yangzhou Yangjie Elec Tech, in a DO-214AA(SMB). 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, the end marked with the band on the uni-directional SMBJ18AQ (VRWM 18.0 V, VBR 20.00-22.10 V at 1 mA, VC 29.2 V at 20.6 A). |
| 2 | A | passive | Anode terminal, the unbanded end of the uni-directional SMBJ18AQ, which has no marking on this end. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | DO-214AA(SMB) |
| 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 | 20 | | 22.1 | V | @ IT = 1 mA | 2 |
| Test current | IT | | 1 | | mA | Pulse test: tp≤50ms | 2 |
| Maximum reverse leakage | IR | | | 1 | μA | @ VRWM | 2 |
| Working peak reverse voltage | VRWM | | 18 | | V | | 2 |
| Maximum reverse surge current | IPP | | | 20.6 | A | Surge current waveform per Fig.3 and derated per Fig.2 | 2 |
| Maximum clamping voltage | Vc | | | 29.2 | V | @ IPP | 2 |
| Maximum instantaneous forward voltage | VF | | | 3.5 | V | at 50A for unidirectional only | 1 |
| Peak pulse power dissipation | PPPM | | | 600 | W | with a 10/1000us waveform | 1 |
| Power dissipation | PD | | | 5 | W | on infinite heat sink at TL=75℃ | 1 |
| Peak forward surge current | IFSM | | | 100 | A | 8.3 ms single half sine-wave unidirectional only | 1 |
| Operating junction temperature | TJ | -55 | | 175 | ℃ | | 1 |
| Storage temperature range | TSTG | -55 | | 175 | ℃ | | 1 |
| Thermal resistance junction to lead | RθJL | | 20 | | ℃/W | junction to lead | 3 |
| Thermal resistance junction to ambient | RθJCA | | 100 | | ℃/W | junction to Ambient | 3 |
## 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 |
|---|---|---|---|---|
| housing | | black | 4. Body color: Black | 3 |
| contacts | | tin | ● Terminals: Matte tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |
## CAD (KiCad official)
- Symbol: `SMBJ18AQ`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: DO-214AA(SMB) (KiCad packages3D, STEP)
- 3D model files: `smbj18aq-etched.step` / `smbj18aq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smbj18aq.step` / `smbj18aq.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](docs/smbj18aq-datasheet.pdf) (6 pp, sha256 `c01aa656ef4102c3`, 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](docs/smbj18aq-datasheet.pdf)