component
SMF78A
Public Made by Adomby adom
FOSAN ESD And Surge Protection (TVS/ESD), SOD-123FL. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
main
SMF78A
FOSAN · ESD And Surge Protection (TVS/ESD) · SOD-123FL
SMF78A from FOSAN, in a SOD-123FL. 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 | FOSAN |
| Package | SOD-123FL |
| 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 | 86.7 | 99.7 | V | IT=1 mA, TA=25℃ | 2 | |
| Reverse Stand-off Working Voltage | VRWM | 78 | V | TA=25℃ | 2 | ||
| Clamping Voltage | VC | 126 | V | IPP=1.59 A | 2 | ||
| Peak Pulse Current | IPP | 1.59 | A | TA=25℃ | 2 | ||
| Reverse Leakage Current | IR | 1 | µA | @VRWM | 2 | ||
| Peak Power Dissipation | PPK | 200 | W | 1 | |||
| Junction/Storage Temperature | TJ,Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal Resistance Junction-Ambient | RθJA | 125 | ℃/W | 1 |
CAD (KiCad official)
- Symbol:
SMF78A - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files:
smf78a-etched.step/smf78a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smf78a.step/smf78a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: FOSAN datasheet (4 pp, sha256
361a736b995ddeab, retrieved 2026-10-22, 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).
# SMF78A
**FOSAN** · ESD And Surge Protection (TVS/ESD) · SOD-123FL
SMF78A from FOSAN, in a SOD-123FL. 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 | FOSAN |
| Package | SOD-123FL |
| 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 | 86.7 | | 99.7 | V | IT=1 mA, TA=25℃ | 2 |
| Reverse Stand-off Working Voltage | VRWM | | 78 | | V | TA=25℃ | 2 |
| Clamping Voltage | VC | | | 126 | V | IPP=1.59 A | 2 |
| Peak Pulse Current | IPP | | | 1.59 | A | TA=25℃ | 2 |
| Reverse Leakage Current | IR | | | 1 | µA | @VRWM | 2 |
| Peak Power Dissipation | PPK | | | 200 | W | | 1 |
| Junction/Storage Temperature | TJ,Tstg | -55 | | 150 | ℃ | | 1 |
| Thermal Resistance Junction-Ambient | RθJA | | | 125 | ℃/W | | 1 |
## CAD (KiCad official)
- Symbol: `SMF78A`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files: `smf78a-etched.step` / `smf78a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smf78a.step` / `smf78a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [FOSAN datasheet](docs/smf78a-datasheet.pdf) (4 pp, sha256 `361a736b995ddeab`, retrieved 2026-10-22, 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/smf78a-datasheet.pdf)