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5KP78A-B
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Littelfuse ESD And Surge Protection (TVS/ESD), P600. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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5KP78A-B
Littelfuse · ESD And Surge Protection (TVS/ESD) · P600
5KP78A-B from Littelfuse, in a P600. 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 | Cathode | passive | Cathode terminal of the uni-directional TVS, marked by the color band on the P600 body; the color band denotes the cathode (uni-directional products only). |
| 2 | Anode | passive | Anode terminal of the uni-directional TVS, the lead opposite the cathode band; the datasheet specifies forward voltage VF of 3.5 V (single die) and 5.0 V (stacked die) at 100 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | P600 |
| 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 | 95.8 | V | @ IT = 5 mA | 2 | |
| Maximum clamping voltage | VC | 126 | V | @ IPP = 40.5 A | 2 | ||
| Maximum peak pulse current | IPP | 40.5 | A | 2 | |||
| Maximum reverse leakage current | IR | 2 | µA | @ VR = 78.0 V | 2 | ||
| Peak pulse power dissipation | PPPM | 5 | kW | 10/1000 µs test waveform (Note 1) | 1 | ||
| Peak forward surge current | IFSM | 400 | A | 8.3 ms single half sine wave, unidirectional only (Note 2) | 1 | ||
| Steady state power dissipation | PD | 8 | W | on infinite heat sink at TL = 75 ºC | 1 | ||
| Operating junction and storage temperature range | TJ, TSTG | -55 | 175 | °C | 1 | ||
| Thermal resistance junction to lead | RθJL | 8 | °C/W | typical | 1 | ||
| Thermal resistance junction to ambient | RθJA | 40 | °C/W | typical | 1 | ||
| VBR temperature coefficient | αT | 0.1 | % | typical; VBR @ TJ = VBR@25°C x (1+αT x (TJ - 25)) | 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 | 1 |
CAD (KiCad official)
- Symbol:
5KP78A-B - Footprint:
Diode_THT:D_P600_R-6_P20.00mm_Horizontal - 3D model: P600 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (6 pp, sha256
a0c9c30e73a4d50e, retrieved 2026-10-16, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).
# 5KP78A-B
**Littelfuse** · ESD And Surge Protection (TVS/ESD) · P600
5KP78A-B from Littelfuse, in a P600. 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 | Cathode | passive | Cathode terminal of the uni-directional TVS, marked by the color band on the P600 body; the color band denotes the cathode (uni-directional products only). |
| 2 | Anode | passive | Anode terminal of the uni-directional TVS, the lead opposite the cathode band; the datasheet specifies forward voltage VF of 3.5 V (single die) and 5.0 V (stacked die) at 100 A. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | P600 |
| 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 | | 95.8 | V | @ IT = 5 mA | 2 |
| Maximum clamping voltage | VC | | | 126 | V | @ IPP = 40.5 A | 2 |
| Maximum peak pulse current | IPP | | | 40.5 | A | | 2 |
| Maximum reverse leakage current | IR | | | 2 | µA | @ VR = 78.0 V | 2 |
| Peak pulse power dissipation | PPPM | | | 5 | kW | 10/1000 µs test waveform (Note 1) | 1 |
| Peak forward surge current | IFSM | | | 400 | A | 8.3 ms single half sine wave, unidirectional only (Note 2) | 1 |
| Steady state power dissipation | PD | | | 8 | W | on infinite heat sink at TL = 75 ºC | 1 |
| Operating junction and storage temperature range | TJ, TSTG | -55 | | 175 | °C | | 1 |
| Thermal resistance junction to lead | RθJL | | 8 | | °C/W | typical | 1 |
| Thermal resistance junction to ambient | RθJA | | 40 | | °C/W | typical | 1 |
| VBR temperature coefficient | αT | | 0.1 | | % | typical; VBR @ TJ = VBR@25°C x (1+αT x (TJ - 25)) | 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 | 1 |
## CAD (KiCad official)
- Symbol: `5KP78A-B`
- Footprint: `Diode_THT:D_P600_R-6_P20.00mm_Horizontal`
- 3D model: P600 (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589852568970571776) (6 pp, sha256 `a0c9c30e73a4d50e`, retrieved 2026-10-16, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/5kp78a-b-datasheet.pdf)