component
SMCJ54A
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Littelfuse TVS, DO-214AB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SMCJ54A
Littelfuse · TVS · DO-214AB
SMCJ54A from Littelfuse, in a 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 end marked by the color band on the unidirectional SMCJ54A (VR 54.0 V, VBR 60.0-66.3 V at 1 mA, VC 87.1 V at 17.3 A Ipp). |
| 2 | A | passive | Anode, the end opposite the cathode band; the unidirectional SMCJ54A conducts in forward direction with VF below 3.5 V at 100 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Reverse Stand-off Voltage | VR | 54 | V | 2 | |||
| Breakdown Voltage | VBR | 60 | 66.3 | V | @ IT = 1 mA | 2 | |
| Test Current | IT | 1 | mA | 2 | |||
| Maximum Clamping Voltage | VC | 87.1 | V | @ Ipp = 17.3 A | 2 | ||
| Maximum Peak Pulse Current | Ipp | 17.3 | A | 2 | |||
| Maximum Reverse Leakage | IR | 1 | µA | @ VR | 2 | ||
| Peak Pulse Power Dissipation | PPPM | 1500 | W | TA=25ºC, 10/1000µs waveform | 1 | ||
| Power Dissipation on Infinite Heat Sink | PD | 6.5 | W | TL=50°C | 1 | ||
| Peak Forward Surge Current | IFSM | 200 | A | 8.3ms single half sine wave, unidirectional only | 1 | ||
| Maximum Instantaneous Forward Voltage | VF | 3.5 | V | at 100A, unidirectional only; 3.5 single die / 5.0 stacked-die | 1 | ||
| Operating Temperature Range | TJ | -65 | 150 | °C | 1 | ||
| Storage Temperature Range | TSTG | -65 | 175 | °C | 1 | ||
| Typical Thermal Resistance Junction to Lead | RθJL | 15 | °C/W | 1 | |||
| Typical Thermal Resistance Junction to Ambient | RθJA | 75 | °C/W | 1 | |||
| Breakdown Voltage Temperature Coefficient | αT | 0.1 | % | typical value | 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 | copper | 2. Mounted on copper pad area of 0.31x0.31” (8.0 x 8.0mm) to each terminal. | 1 |
CAD (KiCad official)
- Symbol:
SMCJ54A - Footprint:
Diode_SMD:D_SMC - 3D model: DO-214AB (KiCad packages3D, STEP)
- 3D model files:
smcj54a-etched.step/smcj54a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smcj54a.step/smcj54a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (6 pp, sha256
6e610db955ed8763, 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).
# SMCJ54A
**Littelfuse** · TVS · DO-214AB
SMCJ54A from Littelfuse, in a 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 end marked by the color band on the unidirectional SMCJ54A (VR 54.0 V, VBR 60.0-66.3 V at 1 mA, VC 87.1 V at 17.3 A Ipp). |
| 2 | A | passive | Anode, the end opposite the cathode band; the unidirectional SMCJ54A conducts in forward direction with VF below 3.5 V at 100 A. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Reverse Stand-off Voltage | VR | | 54 | | V | | 2 |
| Breakdown Voltage | VBR | 60 | | 66.3 | V | @ IT = 1 mA | 2 |
| Test Current | IT | | 1 | | mA | | 2 |
| Maximum Clamping Voltage | VC | | | 87.1 | V | @ Ipp = 17.3 A | 2 |
| Maximum Peak Pulse Current | Ipp | | | 17.3 | A | | 2 |
| Maximum Reverse Leakage | IR | | | 1 | µA | @ VR | 2 |
| Peak Pulse Power Dissipation | PPPM | | | 1500 | W | TA=25ºC, 10/1000µs waveform | 1 |
| Power Dissipation on Infinite Heat Sink | PD | | | 6.5 | W | TL=50°C | 1 |
| Peak Forward Surge Current | IFSM | | | 200 | A | 8.3ms single half sine wave, unidirectional only | 1 |
| Maximum Instantaneous Forward Voltage | VF | | | 3.5 | V | at 100A, unidirectional only; 3.5 single die / 5.0 stacked-die | 1 |
| Operating Temperature Range | TJ | -65 | | 150 | °C | | 1 |
| Storage Temperature Range | TSTG | -65 | | 175 | °C | | 1 |
| Typical Thermal Resistance Junction to Lead | RθJL | | 15 | | °C/W | | 1 |
| Typical Thermal Resistance Junction to Ambient | RθJA | | 75 | | °C/W | | 1 |
| Breakdown Voltage Temperature Coefficient | αT | | 0.1 | | % | typical value | 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 | copper | | 2. Mounted on copper pad area of 0.31x0.31” (8.0 x 8.0mm) to each terminal. | 1 |
## CAD (KiCad official)
- Symbol: `SMCJ54A`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: DO-214AB (KiCad packages3D, STEP)
- 3D model files: `smcj54a-etched.step` / `smcj54a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smcj54a.step` / `smcj54a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Littelfuse datasheet](docs/smcj54a-datasheet.pdf) (6 pp, sha256 `6e610db955ed8763`, 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/smcj54a-datasheet.pdf)