component
SMF51A
Public Made by Adomby adom
DOWO ESD And Surge Protection (TVS/ESD), SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SMF51A
DOWO · ESD And Surge Protection (TVS/ESD) · SOD-123
SMF51A from DOWO, in a SOD-123. 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 (SMF51A), the end marked by the color band, with 51.0 V working peak reverse voltage VRWM and 56.70 to 62.70 V breakdown at 1 mA. |
| 2 | A | passive | Anode of the unidirectional TVS (SMF51A), the end opposite the color band, rated for 200 W peak pulse power (10/1000 µs) and 82.4 V maximum clamping voltage at 2.43 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | DOWO |
| Package | SOD-123 |
| 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 (min/max) | VBR | 56.7 | 62.7 | V | @IT 1 mA | 3 | |
| Maximum reverse leakage current | IR | 1 | uA | @VRWM 51.0 V | 3 | ||
| Maximum reverse surge current | IPP | 2.43 | A | 3 | |||
| Maximum clamping voltage | VC | 82.4 | V | @IPP | 3 | ||
| Peak forward surge current, 8.3 ms single half sine-wave, unidirectional only | IFSM | 20 | A | 8.3 ms single half sine-wave, unidirectional only | 1 | ||
| Maximum instantaneous forward voltage, unidirectional only | VF | 3.5 | V | at 25 A, unidirectional only | 1 | ||
| Operating junction and storage temperature range | TJ, TSTG | -55 | 150 | °C | 1 | ||
| Power dissipation on infinite heatsink | PD | 0.4 | W | infinite heatsink at TL = 75 °C | 1 | ||
| Peak power dissipation with 10/1000 µs waveform | PPP | 200 | W | 10/1000 µs waveform | 1 | ||
| Peak power dissipation with 8/20 µs waveform | PPP | 1000 | W | 8/20 µs waveform | 1 |
CAD (KiCad official)
- Symbol:
SMF51A - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
smf51a-etched.step/smf51a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smf51a.step/smf51a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: DOWO datasheet (3 pp, sha256
8810f72b21736510, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).
# SMF51A
**DOWO** · ESD And Surge Protection (TVS/ESD) · SOD-123
SMF51A from DOWO, in a SOD-123. 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 (SMF51A), the end marked by the color band, with 51.0 V working peak reverse voltage VRWM and 56.70 to 62.70 V breakdown at 1 mA. |
| 2 | A | passive | Anode of the unidirectional TVS (SMF51A), the end opposite the color band, rated for 200 W peak pulse power (10/1000 µs) and 82.4 V maximum clamping voltage at 2.43 A. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | DOWO |
| Package | SOD-123 |
| 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 (min/max) | VBR | 56.7 | | 62.7 | V | @IT 1 mA | 3 |
| Maximum reverse leakage current | IR | | | 1 | uA | @VRWM 51.0 V | 3 |
| Maximum reverse surge current | IPP | | | 2.43 | A | | 3 |
| Maximum clamping voltage | VC | | | 82.4 | V | @IPP | 3 |
| Peak forward surge current, 8.3 ms single half sine-wave, unidirectional only | IFSM | | | 20 | A | 8.3 ms single half sine-wave, unidirectional only | 1 |
| Maximum instantaneous forward voltage, unidirectional only | VF | | | 3.5 | V | at 25 A, unidirectional only | 1 |
| Operating junction and storage temperature range | TJ, TSTG | -55 | | 150 | °C | | 1 |
| Power dissipation on infinite heatsink | PD | | | 0.4 | W | infinite heatsink at TL = 75 °C | 1 |
| Peak power dissipation with 10/1000 µs waveform | PPP | | | 200 | W | 10/1000 µs waveform | 1 |
| Peak power dissipation with 8/20 µs waveform | PPP | | | 1000 | W | 8/20 µs waveform | 1 |
## CAD (KiCad official)
- Symbol: `SMF51A`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `smf51a-etched.step` / `smf51a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smf51a.step` / `smf51a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [DOWO datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590225504571072512) (3 pp, sha256 `8810f72b21736510`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/smf51a-datasheet.pdf)