# RL1206A300K

**RUILON Shenzhen Ruilongyuan Elec** · Varistors · 1206

RL1206A300K from RUILON Shenzhen Ruilongyuan Elec, in a 1206. 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 of two interchangeable end terminations (WB 0.50±0.20 mm) of the bidirectional multilayer varistor; the RL1206A300K has 28.8~36 V varistor voltage at 1 mA, 24 VDC / 18 VAC maximum allowable voltage, and 79 V maximum clamping at 100 A (8/20μs). |
| 2 | 2 | passive | Second interchangeable end termination of the bidirectional, symmetrical varistor; the recommended pad layout uses two pads with a 2.0 mm gap (K) and a 4.0 mm overall span (J). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RUILON Shenzhen Ruilongyuan Elec |
| Package | 1206 |
| 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 |
|---|---|---|---|---|---|---|---|
| Varistor voltage tolerance (part code K) |  | -10 |  | 10 | % | Standard Tolerance K: ±10% | 1 |
| Varistor voltage | V1mA | 28.8 |  | 36 | V |  | 2 |
| Max. allowable AC voltage | VAC |  |  | 18 | V |  | 2 |
| Max. allowable DC voltage | VDC |  |  | 24 | V |  | 2 |
| Max. energy |  |  |  | 0.5 | J | 10/1000μs | 2 |
| Max. clamping voltage | VC |  |  | 79 | V | 8/20μs, IP(A) = 5 | 2 |
| Withstanding surge current | I |  |  | 100 | A | 8/20μs | 2 |
| Varistor voltage change, bias humidity |  | -10 |  | 10 | % | 90%RH, 40ºC, Working Voltage, 1000 hrs | 2 |
| Varistor voltage change, thermal shock |  | -10 |  | 10 | % | -40ºC to 85ºC, 30min cycle, 5 cycles | 2 |
| Varistor voltage change, full load |  | -10 |  | 10 | % | Working Voltage, 85ºC, 1000 hrs | 2 |
| Operating temperature range |  | -55 |  | 125 | ℃ |  | 1 |
| Storage temperature range |  | 5 |  | 40 | ºC | Storage condition, taping package | 3 |

## CAD (KiCad official)

- Symbol: `RL1206A300K`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `rl1206a300k-etched.step` / `rl1206a300k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rl1206a300k.step` / `rl1206a300k.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/8590918743151362049) (4 pp, sha256 `d28fdd03e354ca9c`, 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/rl1206a300k-datasheet.pdf)