# RL1210A240K

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

RL1210A240K 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 | Terminal 1 | passive | One end termination of the bidirectional, symmetrical varistor, rated 18 VDC / 14 VAC maximum with 21.6~27 V varistor voltage at 1 mA and 59 V maximum clamping at 5 A (8/20μs). |
| 2 | Terminal 2 | passive | Other end termination of the bidirectional, symmetrical varistor (interchangeable with terminal 1), withstanding 250 A surge current (8/20μs) and 0.8 J energy (10/1000μs). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RUILON Shenzhen Ruilongyuan Elec |
| 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 |
|---|---|---|---|---|---|---|---|
| Varistor voltage (V1mA) | V1mA | 21.6 |  | 27 | V |  | 2 |
| Varistor voltage tolerance |  | -10 |  | 10 | % | Varistor voltage tolerance code K | 1 |
| Max. allowable voltage (AC) | VAC |  |  | 14 | V |  | 2 |
| Max. allowable voltage (DC) | VDC |  |  | 18 | V |  | 2 |
| Max. clamping voltage | VC |  |  | 59 | V | 8/20μs | 2 |
| Max. peak current | IP |  |  | 5 | A |  | 2 |
| Max. energy |  |  |  | 0.8 | J | 10/1000μs | 2 |
| Withstanding surge current | I |  |  | 250 | 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 voltage |  | -10 |  | 10 | % | Working Voltage,85ºC,1000 hrs | 2 |
| Response time |  |  |  | 1 | ns |  | 2 |
| Operating temperature range |  | -55 |  | 125 | ºC |  | 1 |
| Storage temperature range |  | 5 |  | 40 | ºC | Storage | 2 |
| Storage relative humidity |  |  |  | 65 | % | Storage | 2 |
| Storage time |  |  |  | 12 | months | Taping package storage condition | 2 |
| Heat shock temperature limit |  |  |  | 100 | °C | During soldering process | 3 |
| Soldering gun tip temperature |  |  |  | 280 | °C | Soldering gun under 30W, within 3 seconds | 3 |

## CAD (KiCad official)

- Symbol: `RL1210A240K`
- Footprint: `Resistor_SMD:R_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `rl1210a240k-etched.step` / `rl1210a240k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rl1210a240k.step` / `rl1210a240k.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/8590912678233645056) (4 pp, sha256 `e8cd1faffba96262`, 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/rl1210a240k-datasheet.pdf)