component
SMCJ78A
Public Made by Adomby adom
hongjiacheng ESD And Surge Protection (TVS/ESD), SMC(DO-214AB). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
main
SMCJ78A
hongjiacheng · ESD And Surge Protection (TVS/ESD) · SMC(DO-214AB)
SMCJ78A from hongjiacheng, 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| 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 (unidirectional) | VBR | 86.7 | 95.8 | V | @IT 1 mA, SMCJ78A | 3 | |
| Maximum clamping voltage | VC | 126 | V | @IPP 11.9 A, 10/1000µs waveform | 3 | ||
| Reverse leakage current | IR | 1 | µA | @VRWM 78 V | 3 | ||
| Reverse stand-off voltage | VRWM | 78 | V | Unidirectional SMCJ78A | 3 | ||
| Peak pulse current | IPP | 11.9 | A | 10/1000µs waveform (Note 1, Fig.3), value from SMCJ78A row | 3 | ||
| Peak pulse power dissipation | PPPM | 1500 | W | 10/1000µs waveform (Fig.1) (Note 1), (Note 2) | 1 | ||
| Power dissipation on infinite heat sink | PM(AV) | 6.5 | W | Infinite heat sink at TL=75°C | 1 | ||
| Peak forward surge current | IFSM | 200 | A | 8.3ms single half sine wave (Note 3) | 1 | ||
| Maximum instantaneous forward voltage | VF | 3.5 | V | At 25A, unidirectional only (Note 4: VF<3.5V for VBR<200V) | 1 | ||
| Operating junction and storage temperature range | TJ, TSTG | -55 | 150 | ℃ | 1 | ||
| Typical maximum temperature coefficient of VBR | ΔVBR | 0.1 | % | ΔVBR = 0.1% × VBR@25℃ × ΔT (typical maximum) | 1 | ||
| Typical thermal resistance junction to lead | RθJ-L | 15 | ℃/W | 1 | |||
| Typical thermal resistance junction to ambient | RθJ-A | 75 | ℃/W | Mounted on 5.0mm x 5.0mm copper pads to each terminal (Note 2) | 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 | tin | •Matte tin lead-free Plated •Halogen free and RoHS compliant | 1 |
CAD (KiCad official)
- Symbol:
SMCJ78A - Footprint:
Diode_SMD:D_SMC - 3D model: SMC(DO-214AB) (KiCad packages3D, STEP)
- 3D model files:
smcj78a-etched.step/smcj78a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smcj78a.step/smcj78a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: hongjiacheng datasheet (5 pp, sha256
5cbe7c34174b4905, retrieved 2026-10-21, 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).
# SMCJ78A
**hongjiacheng** · ESD And Surge Protection (TVS/ESD) · SMC(DO-214AB)
SMCJ78A from hongjiacheng, 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| 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 (unidirectional) | VBR | 86.7 | | 95.8 | V | @IT 1 mA, SMCJ78A | 3 |
| Maximum clamping voltage | VC | | | 126 | V | @IPP 11.9 A, 10/1000µs waveform | 3 |
| Reverse leakage current | IR | | | 1 | µA | @VRWM 78 V | 3 |
| Reverse stand-off voltage | VRWM | | | 78 | V | Unidirectional SMCJ78A | 3 |
| Peak pulse current | IPP | | | 11.9 | A | 10/1000µs waveform (Note 1, Fig.3), value from SMCJ78A row | 3 |
| Peak pulse power dissipation | PPPM | | | 1500 | W | 10/1000µs waveform (Fig.1) (Note 1), (Note 2) | 1 |
| Power dissipation on infinite heat sink | PM(AV) | | | 6.5 | W | Infinite heat sink at TL=75°C | 1 |
| Peak forward surge current | IFSM | | | 200 | A | 8.3ms single half sine wave (Note 3) | 1 |
| Maximum instantaneous forward voltage | VF | | | 3.5 | V | At 25A, unidirectional only (Note 4: VF<3.5V for VBR<200V) | 1 |
| Operating junction and storage temperature range | TJ, TSTG | -55 | | 150 | ℃ | | 1 |
| Typical maximum temperature coefficient of VBR | ΔVBR | | | 0.1 | % | ΔVBR = 0.1% × VBR@25℃ × ΔT (typical maximum) | 1 |
| Typical thermal resistance junction to lead | RθJ-L | | 15 | | ℃/W | | 1 |
| Typical thermal resistance junction to ambient | RθJ-A | | 75 | | ℃/W | Mounted on 5.0mm x 5.0mm copper pads to each terminal (Note 2) | 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 | | tin | •Matte tin lead-free Plated •Halogen free and RoHS compliant | 1 |
## CAD (KiCad official)
- Symbol: `SMCJ78A`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: SMC(DO-214AB) (KiCad packages3D, STEP)
- 3D model files: `smcj78a-etched.step` / `smcj78a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smcj78a.step` / `smcj78a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [hongjiacheng datasheet](docs/smcj78a-datasheet.pdf) (5 pp, sha256 `5cbe7c34174b4905`, retrieved 2026-10-21, 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/smcj78a-datasheet.pdf)