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RL1812A391K

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by adom

RUILON Shenzhen Ruilongyuan Elec Varistors, 1812. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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RL1812A391K

RUILON Shenzhen Ruilongyuan Elec · Varistors · 1812

RL1812A391K from RUILON Shenzhen Ruilongyuan Elec, in a 1812. 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 terminal of the bidirectional, symmetrical varistor (WB 0.60±0.25 mm end termination); for RL1812A391K the varistor voltage is 351~429 V at 1 mA, with max allowable voltage 250 VAC / 320 VDC.
2 2 passive Second terminal of the bidirectional, symmetrical varistor, interchangeable with the other terminal; for RL1812A391K the varistor voltage is 351~429 V at 1 mA, with max allowable voltage 250 VAC / 320 VDC.

Key specifications

Parameter Value
Manufacturer RUILON Shenzhen Ruilongyuan Elec
Package 1812
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 351 429 V 2
Max allowable voltage (AC) VAC 250 V 2
Max allowable voltage (DC) VDC 320 V 2
Max energy 2.3 J 10/1000μs 2
Max clamping voltage VC 675 V 8/20μs, IP = 10 A 2
Withstanding surge current I 400 A 8/20μs 2
Tolerance (K code) -10 10 % Standard tolerance K: ±10% 1
Varistor voltage change after bias humidity VV/VV -10 10 % 90%RH, 40ºC, working voltage, 1000 hrs 3
Varistor voltage change after thermal shock VV/VV -10 10 % -40ºC to 85ºC, 30 min cycle, 5 cycles 3
Varistor voltage change after full load VV/VV -10 10 % Working voltage, 85ºC, 1000 hrs 3
Response time 1 ns <1ns as printed 3
Operating temperature range -55 125 ℃ 1
Storage temperature range 5 40 ℃ Storage; relative humidity up to 65% 3

CAD (KiCad official)

  • Symbol: RL1812A391K
  • Footprint: Resistor_SMD:R_1812_4532Metric
  • 3D model: 1812 (KiCad packages3D, STEP)
  • 3D model files: rl1812a391k-etched.step / rl1812a391k-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); rl1812a391k.step / rl1812a391k.glb are the bare package body.

Provenance

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

  • Datasheet: RUILON Shenzhen Ruilongyuan Elec datasheet (5 pp, sha256 61703208a13c9353, retrieved 2026-10-19, 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