component
SMAJ18CA-TR
Public Made by Adomby adom
STMicroelectronics ESD And Surge Protection (TVS/ESD), SMA(DO-214AC). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
main
SMAJ18CA-TR
STMicroelectronics · ESD And Surge Protection (TVS/ESD) · SMA(DO-214AC)
SMAJ18CA-TR from STMicroelectronics, in a SMA(DO-214AC). 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SMA(DO-214AC) |
| 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 (bidirectional, 18 V stand-off) | VBR | 18 | 20 | 21.1 | V | @ IR = 1 mA; pulse test tp < 50 ms | 3 |
| Leakage current at VRM, 25 °C | IRM | 0.2 | µA | @ VRM, 25 °C | 3 | ||
| Leakage current at VRM, 85 °C | IRM | 1 | µA | @ VRM, 85 °C | 3 | ||
| Clamping voltage, 10/1000 µs surge | VCL | 29.2 | V | @ IPP = 13.7 A, 10/1000 µs | 3 | ||
| Dynamic resistance, 10/1000 µs surge | RD | 0.514 | Ω | 10/1000 µs | 3 | ||
| Clamping voltage, 8/20 µs surge | VCL | 39.3 | V | @ IPP = 59 A, 8/20 µs | 3 | ||
| Dynamic resistance, 8/20 µs surge | RD | 0.291 | Ω | 8/20 µs | 3 | ||
| Peak pulse power dissipation | PPP | 400 | W | 10/1000 µs, Tj initial = Tamb | 2 | ||
| Storage temperature range | Tstg | -65 | 150 | °C | 2 | ||
| Operating junction temperature range | Tj | -55 | 150 | °C | 2 | ||
| Maximum lead temperature for soldering | TL | 260 | °C | during 10 s | 2 | ||
| Voltage temperature coefficient | αT | 9.2 | 10-4/°C | 3 | |||
| Thermal resistance, junction to leads | Rth(j-l) | 30 | °C/W | 2 | |||
| Thermal resistance, junction to ambient | Rth(j-a) | 120 | °C/W | on printed circuit on recommended pad layout | 2 |
CAD (KiCad official)
- Symbol:
SMAJ18CA-TR - Footprint:
Diode_SMD:D_SMA - 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files:
smaj18ca-tr-etched.step/smaj18ca-tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smaj18ca-tr.step/smaj18ca-tr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (10 pp, sha256
4bb181453198810d, retrieved 2026-10-14, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band 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).
# SMAJ18CA-TR
**STMicroelectronics** · ESD And Surge Protection (TVS/ESD) · SMA(DO-214AC)
SMAJ18CA-TR from STMicroelectronics, in a SMA(DO-214AC). 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SMA(DO-214AC) |
| 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 (bidirectional, 18 V stand-off) | VBR | 18 | 20 | 21.1 | V | @ IR = 1 mA; pulse test tp < 50 ms | 3 |
| Leakage current at VRM, 25 °C | IRM | | | 0.2 | µA | @ VRM, 25 °C | 3 |
| Leakage current at VRM, 85 °C | IRM | | | 1 | µA | @ VRM, 85 °C | 3 |
| Clamping voltage, 10/1000 µs surge | VCL | | | 29.2 | V | @ IPP = 13.7 A, 10/1000 µs | 3 |
| Dynamic resistance, 10/1000 µs surge | RD | | | 0.514 | Ω | 10/1000 µs | 3 |
| Clamping voltage, 8/20 µs surge | VCL | | | 39.3 | V | @ IPP = 59 A, 8/20 µs | 3 |
| Dynamic resistance, 8/20 µs surge | RD | | | 0.291 | Ω | 8/20 µs | 3 |
| Peak pulse power dissipation | PPP | | | 400 | W | 10/1000 µs, Tj initial = Tamb | 2 |
| Storage temperature range | Tstg | -65 | | 150 | °C | | 2 |
| Operating junction temperature range | Tj | -55 | | 150 | °C | | 2 |
| Maximum lead temperature for soldering | TL | | | 260 | °C | during 10 s | 2 |
| Voltage temperature coefficient | αT | | 9.2 | | 10-4/°C | | 3 |
| Thermal resistance, junction to leads | Rth(j-l) | | 30 | | °C/W | | 2 |
| Thermal resistance, junction to ambient | Rth(j-a) | | 120 | | °C/W | on printed circuit on recommended pad layout | 2 |
## CAD (KiCad official)
- Symbol: `SMAJ18CA-TR`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `smaj18ca-tr-etched.step` / `smaj18ca-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smaj18ca-tr.step` / `smaj18ca-tr.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588902667766124544) (10 pp, sha256 `4bb181453198810d`, retrieved 2026-10-14, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/smaj18ca-tr-datasheet.pdf)