# RL1210A390K

**RUILON Shenzhen Ruilongyuan Elec** · Varistors · 1210

RL1210A390K from RUILON Shenzhen Ruilongyuan Elec, 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 | Bidirectional, symmetrical varistor terminal (varistor voltage 36~45V at 1mA, max 30VDC allowable, interchangeable with pin 2). |
| 2 | 2 | passive | Bidirectional, symmetrical varistor terminal (varistor voltage 36~45V at 1mA, max 30VDC allowable, interchangeable with pin 1). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RUILON Shenzhen Ruilongyuan Elec |
| Package | 1210 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `RL1210A390K`
- Footprint: `Resistor_SMD:R_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `rl1210a390k-etched.step` / `rl1210a390k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rl1210a390k.step` / `rl1210a390k.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [RUILON Shenzhen Ruilongyuan Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590909291111407616) (4 pp, sha256 `e8cd1faffba96262`, retrieved 2026-10-09, 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/rl1210a390k-datasheet.pdf)