# RL0603A390K

**RUILON Shenzhen Ruilongyuan Elec** · Varistors · 0603

RL0603A390K from RUILON Shenzhen Ruilongyuan Elec, in a 0603. 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 | First end termination of the bidirectional, symmetrical varistor (RL0603A390K: varistor voltage 36~45 V at 1 mA, max 25 VAC / 30 VDC), interchangeable with the other terminal. |
| 2 | 2 | passive | Second end termination of the bidirectional, symmetrical varistor (RL0603A390K: max clamping voltage 99 V at 8/20 µs, 1 A), interchangeable with the other terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RUILON Shenzhen Ruilongyuan Elec |
| Package | 0603 |
| 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 | 36 |  | 45 | V |  | 2 |
| Varistor voltage tolerance (code K) |  | -10 |  | 10 | % | Varistor voltage tolerance K: ±10% | 1 |
| Max. allowable voltage AC |  |  |  | 25 | V |  | 2 |
| Max. allowable voltage DC |  |  |  | 30 | V |  | 2 |
| Max. energy |  |  |  | 0.3 | J | 10/1000μs | 2 |
| Clamping voltage | VC |  |  | 99 | V | 8/20μs | 2 |
| Withstanding surge current | I |  |  | 30 | 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 to85ºC,30min.cycle,5 cycles | 2 |
| Varistor voltage change, full load voltage |  | -10 |  | 10 | % | Working Voltage,85ºC,1000 hrs | 2 |
| Response time |  |  |  | 1 | ns | <1ns | 2 |
| Operating temperature range |  | -55 |  | 125 | ℃ |  | 1 |
| Storage temperature |  | 5 |  | 40 | ℃ |  | 2 |
| Storage relative humidity |  |  |  | 65 | %RH |  | 2 |
| Storage time |  |  |  | 12 | months | Taping package, 12 months max | 2 |
| Heat shock during soldering |  |  |  | 100 | °C | Heat shock in soldering process | 3 |
| Soldering gun tip temperature |  |  |  | 280 | °C | Soldering gun under 30W, within 3 seconds | 3 |
| Reflow peak temperature (Pb-free) | TP |  | 260 |  | °C | Printed as 260 +0/-5°C | 3 |

## CAD (KiCad official)

- Symbol: `RL0603A390K`
- Footprint: `Resistor_SMD:R_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `rl0603a390k-etched.step` / `rl0603a390k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rl0603a390k.step` / `rl0603a390k.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/8590905707984068608) (4 pp, sha256 `57dffee942a9641e`, 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/rl0603a390k-datasheet.pdf)