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SMD1812P125TF

Public Made by Adom

by adom

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

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SMD1812P125TF

RUILON Shenzhen Ruilongyuan Elec · Resettable Fuses · 1812

SMD1812P125TF 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 resettable PTC fuse, which is non-polarized and interchangeable with the other terminal; Ihold 1.25 A, Itrip 2.5 A, Vmax 16 VDC, Imax 8 A.
2 2 passive Other terminal of the resettable PTC fuse, which is non-polarized and interchangeable with the other terminal; Ihold 1.25 A, Itrip 2.5 A, Vmax 16 VDC, Imax 8 A.

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
Hold current (maximum current without tripping, 25°C still air) Ihold 1.25 A 25°C still air 2
Trip current (minimum current at which device always trips, 25°C still air) Itrip 2.5 A 25°C still air 2
Maximum operating voltage Vmax 16 VDC at rated current Imax 2
Maximum fault current Imax 35 A at rated voltage Vmax 2
Maximum time to trip Tmax 0.4 s at 8 A 2
Power dissipation in tripped state Pd 0.8 W tripped state, 25°C still air, at rated voltage 2
Minimum resistance prior to tripping at 25°C Rimin 0.05 Ω 25°C 2
Maximum resistance one hour post reflow R1max 0.14 Ω measured one hour post reflow 2
Resistance change, passive aging 5 % +85℃, 1000 hrs; printed ±5% typical 1
Resistance change, humidity aging 5 % +85℃, 85%R.H., 168 hours; printed ±5% typical 1
Resistance change, thermal shock 33 % +85℃ to -40℃, 20 times; printed ±33% typical 1
Ambient operating temperature Ta -40 85 °C ambient operating conditions 1
Maximum surface temperature in tripped state 125 °C device in tripped state 1

CAD (KiCad official)

  • Symbol: SMD1812P125TF
  • Footprint: Fuse:Fuse_1812_4532Metric
  • 3D model: 1812, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9 mm nominal 1806 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
  • 3D model files: smd1812p125tf-etched.step / smd1812p125tf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smd1812p125tf.step / smd1812p125tf.glb are the bare package body.

Provenance

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

  • Datasheet: RUILON Shenzhen Ruilongyuan Elec datasheet (8 pp, sha256 17f9c523d0f567cd, 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