component
SMDJ18A
Public Made by Adomby adom
Brightking Elec (TAIWAN) TVS, SMC(DO-214AB). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SMDJ18A
Brightking Elec (TAIWAN) · TVS · SMC(DO-214AB)
SMDJ18A from Brightking Elec (TAIWAN), in a SMC(DO-214AB). 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 of the unidirectional TVS (marked by the color band), which is connected to the positive side of the circuit being protected; the SMDJ18A has VRWM 18.0V, VBR 20.00~22.10V at 1mA and VC 29.2V at 102.7A. |
| 2 | A | passive | Anode of the unidirectional TVS, which is connected to the return/ground side of the circuit; it conducts forward like a diode with IFSM 300A (8.3ms half sine-wave). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Brightking Elec (TAIWAN) |
| Package | SMC(DO-214AB) |
| 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=1mA, TA=25℃ | 2 | |
| Reverse Stand-Off Voltage | VRWM | 18 | V | TA=25℃ | 2 | ||
| Maximum Clamping Voltage | VC | 29.2 | V | @IPP=102.7A, TA=25℃ | 2 | ||
| Peak Pulse Current | IPP | 102.7 | A | 10/1000μs waveform | 2 | ||
| Reverse Leakage | IR | 2 | μA | @VRWM, TA=25℃ | 2 | ||
| Test Current | IT | 1 | mA | TA=25℃ | 2 | ||
| Peak pulse power dissipation | PPPM | 3000 | Watts | 10/1000μs waveform (Note1, Note2, Fig.1) | 1 | ||
| Steady state power dissipation | PM(AV) | 6.5 | Watts | TA=50℃ (Fig.5) | 1 | ||
| Peak forward surge current | IFSM | 300 | Amps | 8.3ms single half sine-wave superimposed on rated load, JEDEC Method (Note3, Fig.6) | 1 | ||
| Operating junction and storage temperature range | TJ,TSTG | -55 | 150 | ℃ | 1 | ||
| Thermal resistance junction to lead | RθJL | 15 | ℃/W | Typical | 1 | ||
| Thermal resistance junction to ambient | RθJA | 75 | ℃/W | Typical | 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 8.0mm×8.0mm copper pads to each terminal. | 1 |
CAD (KiCad official)
- Symbol:
SMDJ18A - Footprint:
Diode_SMD:D_SMC - 3D model: SMC(DO-214AB) (KiCad packages3D, STEP)
- 3D model files:
smdj18a-etched.step/smdj18a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smdj18a.step/smdj18a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Brightking Elec (TAIWAN) datasheet (6 pp, sha256
ca25bd05b5281e29, 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).
# SMDJ18A
**Brightking Elec (TAIWAN)** · TVS · SMC(DO-214AB)
SMDJ18A from Brightking Elec (TAIWAN), in a SMC(DO-214AB). 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 of the unidirectional TVS (marked by the color band), which is connected to the positive side of the circuit being protected; the SMDJ18A has VRWM 18.0V, VBR 20.00~22.10V at 1mA and VC 29.2V at 102.7A. |
| 2 | A | passive | Anode of the unidirectional TVS, which is connected to the return/ground side of the circuit; it conducts forward like a diode with IFSM 300A (8.3ms half sine-wave). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Brightking Elec (TAIWAN) |
| Package | SMC(DO-214AB) |
| 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=1mA, TA=25℃ | 2 |
| Reverse Stand-Off Voltage | VRWM | | 18 | | V | TA=25℃ | 2 |
| Maximum Clamping Voltage | VC | | | 29.2 | V | @IPP=102.7A, TA=25℃ | 2 |
| Peak Pulse Current | IPP | | | 102.7 | A | 10/1000μs waveform | 2 |
| Reverse Leakage | IR | | | 2 | μA | @VRWM, TA=25℃ | 2 |
| Test Current | IT | | 1 | | mA | TA=25℃ | 2 |
| Peak pulse power dissipation | PPPM | 3000 | | | Watts | 10/1000μs waveform (Note1, Note2, Fig.1) | 1 |
| Steady state power dissipation | PM(AV) | | | 6.5 | Watts | TA=50℃ (Fig.5) | 1 |
| Peak forward surge current | IFSM | | | 300 | Amps | 8.3ms single half sine-wave superimposed on rated load, JEDEC Method (Note3, Fig.6) | 1 |
| Operating junction and storage temperature range | TJ,TSTG | -55 | | 150 | ℃ | | 1 |
| Thermal resistance junction to lead | RθJL | | 15 | | ℃/W | Typical | 1 |
| Thermal resistance junction to ambient | RθJA | | 75 | | ℃/W | Typical | 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 8.0mm×8.0mm copper pads to each terminal. | 1 |
## CAD (KiCad official)
- Symbol: `SMDJ18A`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: SMC(DO-214AB) (KiCad packages3D, STEP)
- 3D model files: `smdj18a-etched.step` / `smdj18a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smdj18a.step` / `smdj18a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Brightking Elec (TAIWAN) datasheet](docs/smdj18a-datasheet.pdf) (6 pp, sha256 `ca25bd05b5281e29`, 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/smdj18a-datasheet.pdf)