# RL0805A391K

**RUILON Shenzhen Ruilongyuan Elec** · Varistors · 0805

RL0805A391K from RUILON Shenzhen Ruilongyuan Elec, in a 0805. 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 end terminal of the bidirectional, symmetrical multilayer varistor (non-polarized); RL0805A391K has varistor voltage 351~429V at 1mA, max 250VAC / 320VDC. |
| 2 | 2 | passive | Other end terminal of the bidirectional, symmetrical multilayer varistor (non-polarized); max clamping voltage 675V at 10A (8/20μs), 2A peak current, 0.1J max energy. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RUILON Shenzhen Ruilongyuan Elec |
| Package | 0805 |
| 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 | V1mA | 351 |  | 429 | V |  | 2 |
| Varistor voltage tolerance (K suffix) |  | -10 |  | 10 | % | K = ±10% | 1 |
| Max. allowable voltage (AC) | VAC |  |  | 250 | V |  | 2 |
| Max. allowable voltage (DC) | VDC |  |  | 320 | V |  | 2 |
| Max. energy |  |  |  | 0.1 | J | 10/1000μs | 2 |
| Max. clamping voltage | VC |  |  | 675 | V | 8/20μs, IP = 2 A | 2 |
| Withstanding surge current | I |  |  | 10 | A | 8/20μs | 2 |
| Bias humidity varistor voltage change | VV/VV | -10 |  | 10 | % | 90%RH, 40ºC, working voltage, 1000 hrs | 2 |
| Thermal shock varistor voltage change | VV/VV | -10 |  | 10 | % | -40ºC to 85ºC, 30 min cycle, 5 cycles | 2 |
| Full load varistor voltage change | VV/VV | -10 |  | 10 | % | Working voltage, 85ºC, 1000 hrs | 2 |
| Response time |  |  |  | 1 | ns |  | 2 |
| Operating temperature range |  | -55 |  | 125 | ℃ |  | 1 |
| Storage temperature range |  | 5 |  | 40 | ℃ | Storage condition | 2 |
| Storage relative humidity |  |  |  | 65 | % | Storage condition | 2 |

## CAD (KiCad official)

- Symbol: `RL0805A391K`
- Footprint: `Resistor_SMD:R_0805_2012Metric`
- 3D model: 0805 (KiCad packages3D, STEP)
- 3D model files: `rl0805a391k-etched.step` / `rl0805a391k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rl0805a391k.step` / `rl0805a391k.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [RUILON Shenzhen Ruilongyuan Elec datasheet](docs/rl0805a391k-datasheet.pdf) (4 pp, sha256 `bdb2791a3d6b9dbb`, retrieved 2026-10-17, 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/rl0805a391k-datasheet.pdf)