component
SMAJ12A-JSM
Public Made by Adomby 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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SMAJ12A-JSM
JSMSEMI · ESD And Surge Protection (TVS/ESD) · SMA
SMAJ12A-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 400W TVS diode; connect to the positive line being protected (reverse standoff voltage VRWM 12V for SMAJ12A). |
| 2 | Anode | passive | Anode of the unidirectional 400W TVS diode; connect to ground/return 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 | 13.3 | 14.7 | V | @ IT | 2 | |
| Test current | IT | 1 | mA | 2 | |||
| Reverse standoff voltage | VRWM | 12 | V | 2 | |||
| Max reverse leakage | IR_MAX | 1 | µA | @ VRWM | 2 | ||
| Max peak pulse current | IPP_MAX | 20.1 | A | 10/1000μs waveform | 2 | ||
| Max clamping voltage | VC_MAX | 19.9 | V | @ IPP | 2 | ||
| Peak power dissipation | PPPM | 400 | W | 10/1000μs waveform, TA = 25°C | 1 | ||
| Thermal resistance junction to ambient | RθJA | 70 | °C/W | Device mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad area | 1 | ||
| Thermal resistance junction to case | RθJC | 25 | °C/W | Device mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad area | 1 | ||
| Thermal resistance junction to lead | RθJL | 30 | °C/W | Device mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad area | 1 | ||
| Operating junction and storage temperature range | TJ, TSTG | -55 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
SMAJ12A-JSM - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
smaj12a-jsm-etched.step/smaj12a-jsm-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smaj12a-jsm.step/smaj12a-jsm.glbare 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, 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).
# SMAJ12A-JSM
**JSMSEMI** · ESD And Surge Protection (TVS/ESD) · SMA
SMAJ12A-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 400W TVS diode; connect to the positive line being protected (reverse standoff voltage VRWM 12V for SMAJ12A). |
| 2 | Anode | passive | Anode of the unidirectional 400W TVS diode; connect to ground/return 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 | 13.3 | | 14.7 | V | @ IT | 2 |
| Test current | IT | | 1 | | mA | | 2 |
| Reverse standoff voltage | VRWM | | 12 | | V | | 2 |
| Max reverse leakage | IR_MAX | | | 1 | µA | @ VRWM | 2 |
| Max peak pulse current | IPP_MAX | | | 20.1 | A | 10/1000μs waveform | 2 |
| Max clamping voltage | VC_MAX | | | 19.9 | V | @ IPP | 2 |
| Peak power dissipation | PPPM | 400 | | | W | 10/1000μs waveform, TA = 25°C | 1 |
| Thermal resistance junction to ambient | RθJA | | 70 | | °C/W | Device mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad area | 1 |
| Thermal resistance junction to case | RθJC | | 25 | | °C/W | Device mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad area | 1 |
| Thermal resistance junction to lead | RθJL | | 30 | | °C/W | Device mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad area | 1 |
| Operating junction and storage temperature range | TJ, TSTG | -55 | | 150 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `SMAJ12A-JSM`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `smaj12a-jsm-etched.step` / `smaj12a-jsm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smaj12a-jsm.step` / `smaj12a-jsm.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [JSMSEMI datasheet](docs/smaj12a-jsm-datasheet.pdf) (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](docs/smaj12a-jsm-datasheet.pdf)