# VCAS121018J390RP

**Kyocera AVX** · Varistors · 1210

VCAS121018J390RP from Kyocera AVX, in a 1210. 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 | 1 | passive | One Ni/Sn plated termination of the bi-directional varistor, rated 18 Vdc / 13 Vac working voltage, 25.5 V ±10% typical breakdown at 1 mA and 42 V max clamping at 5 A. |
| 2 | 2 | passive | Second Ni/Sn plated termination of the bi-directional varistor (interchangeable with the other terminal), rated 500 A peak (8x20 µs), 1.6 J transient energy (10x1000 µs) and 3 J load dump energy. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Kyocera AVX |
| Package | 1210 |
| 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 |
|---|---|---|---|---|---|---|---|
| DC working voltage (max) | VW(DC) |  |  | 18 | Vdc |  | 2 |
| AC working voltage (max) | VW(AC) |  |  | 13 | Vac |  | 2 |
| Maximum leakage current at working voltage | IL |  |  | 10 | μA | at the working voltage | 2 |
| Load dump energy rating | ELD |  |  | 3 | J |  | 2 |
| Transient energy rating | ET |  |  | 1.6 | J | 10x1000μS | 2 |
| Peak current rating | IP |  |  | 500 | A | 8x20μS | 2 |
| Power dissipation (max) | PDiss. |  |  | 0.03 | W |  | 2 |
| Operating temperature range |  | -55 |  | 125 | °C |  | 1 |
| Breakdown voltage tolerance | VB | -10 |  | 10 | % |  | 2 |
| Typical breakdown voltage | VB |  | 25.5 |  | V | @ 1mADC | 2 |
| Clamping voltage | VC |  | 42 |  | V | @ IVC 5 A | 2 |
| Typical capacitance | Cap |  | 3100 |  | pF | @ frequency K as printed, 0.5 VRMS | 2 |
| Jump start voltage | VJump |  | 27.5 |  | V |  | 2 |

## CAD (KiCad official)

- Symbol: `VCAS121018J390RP`
- Footprint: `Resistor_SMD:R_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `vcas121018j390rp-etched.step` / `vcas121018j390rp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `vcas121018j390rp.step` / `vcas121018j390rp.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Kyocera AVX datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588906739537727488) (10 pp, sha256 `a98e18cf89c257ed`, 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/vcas121018j390rp-datasheet.pdf)