# RL1210A101K

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

RL1210A101K 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 | Terminal 1 of the bidirectional, symmetrical multilayer varistor (V1mA 90~110V, max allowable 53Vac / 75Vdc for RL1210A101K); interchangeable with terminal 2. |
| 2 | 2 | passive | Terminal 2 of the bidirectional, symmetrical multilayer varistor (V1mA 90~110V, max allowable 53Vac / 75Vdc for RL1210A101K); interchangeable with terminal 1. |

## 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 | 90 |  | 110 | V |  | 2 |
| Varistor voltage tolerance (K) |  | -10 |  | 10 | % | Tolerance letter K = ±10% | 1 |
| Max. allowable voltage (AC) | VAC |  |  | 53 | V |  | 2 |
| Max. allowable voltage (DC) | VDC |  |  | 75 | V |  | 2 |
| Max. energy |  |  |  | 1 | J | 10/1000μs | 2 |
| Max. clamping voltage | VC |  |  | 176 | V | 8/20μs, IP = 5 A | 2 |
| Withstanding surge current | I |  |  | 300 | A | 8/20μs | 2 |
| Operating temperature range |  | -55 |  | 125 | ℃ |  | 1 |
| Storage temperature range |  | 5 |  | 40 | ℃ | Storage | 3 |
| Response time |  |  |  | 1 | ns | Printed as <1 ns | 1 |
| Varistor voltage change, bias humidity | VV / VV | -10 |  | 10 | % | 90%RH, 40ºC, working voltage, 1000 hrs | 3 |
| Varistor voltage change, thermal shock | VV / VV | -10 |  | 10 | % | -40ºC to 85ºC, 30 min cycle, 5 cycles | 3 |
| Varistor voltage change, full load | VV / VV | -10 |  | 10 | % | Working voltage, 85ºC, 1000 hrs | 3 |

## CAD (KiCad official)

- Symbol: `RL1210A101K`
- Footprint: `Resistor_SMD:R_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `rl1210a101k-etched.step` / `rl1210a101k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rl1210a101k.step` / `rl1210a101k.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [RUILON Shenzhen Ruilongyuan Elec datasheet](docs/rl1210a101k-datasheet.pdf) (5 pp, sha256 `484c6911b489b2f4`, 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/rl1210a101k-datasheet.pdf)