component

1206L050YR

Public Made by Adom

by adom

Littelfuse Resettable Fuses, 1206. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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1206L050YR

Littelfuse · Resettable Fuses · 1206

1206L050YR from Littelfuse, in a 1206. 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 of two interchangeable solder-plated copper end terminals of the resettable PTC; the 1206L050 is rated 0.50 A hold, 1.00 A trip, 6 Vdc max, 100 A max fault current.
2 2 passive Second interchangeable solder-plated copper end terminal of the resettable PTC (non-polarized); the 1206L050 has 0.10 ohm min and 0.150 ohm R1max resistance, with 0.70 ohm listed as the maximum resistance after trip or reflow.

Key specifications

Parameter Value
Manufacturer Littelfuse
Package 1206
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
Minimum resistance in initial (un-soldered) state R min 0.15 Ω Initial un-soldered state 1
Maximum resistance at 20°C after trip or reflow R 1max 0.7 Ω 20°C, measured one hour after tripping or reflow soldering of 260°C for 20 sec 1
Hold current I hold 0.5 A 20°C still air; maximum current device passes without tripping 1
Trip current I trip 1 A 20°C still air; minimum current at which device trips 1
Maximum voltage V max 6 Vdc Maximum voltage device withstands without damage at rated current (I max) 1
Maximum fault current I max 100 A Maximum fault current device withstands without damage at rated voltage (Vmax) 1
Maximum time to trip 0.1 s At 8.00 A 1
Hold current vs ambient temperature I hold 0.71 A Ambient -40°C 2
Hold current vs ambient temperature I hold 0.64 A Ambient -20°C 2
Hold current vs ambient temperature I hold 0.57 A Ambient 0°C 2
Hold current vs ambient temperature I hold 0.5 A Ambient 20°C 2
Hold current vs ambient temperature I hold 0.42 A Ambient 40°C 2
Hold current vs ambient temperature I hold 0.39 A Ambient 50°C 2
Hold current vs ambient temperature I hold 0.35 A Ambient 60°C 2
Hold current vs ambient temperature I hold 0.31 A Ambient 70°C 2
Hold current vs ambient temperature I hold 0.25 A Ambient 85°C 2
Passive aging resistance change -5 5 % Passive aging +85°C, 1000 hours; typical resistance change 3
Humidity aging resistance change -5 5 % Humidity aging +85°C, 85% R.H., 1000 hours; typical resistance change 3
Operating/storage temperature -40 85 °C Operating/storage 3
Maximum device surface temperature in tripped state 125 °C Tripped state 3
Preheat temperature Ts 150 200 °C Pb-free reflow preheat 3
Preheat time ts 60 180 s Pb-free reflow, preheat from Ts(min) to Ts(max) 3
Time above liquidus tL 60 150 s Pb-free reflow, above TL 217°C 3
Time within 5°C of peak temperature tp 20 40 s Pb-free reflow 3
Average ramp-up rate (TS(max) to TP) 3 °C/second Pb-free reflow, maximum 3
Ramp-down rate 6 °C/second Pb-free reflow, maximum 3
Time 25°C to peak temperature 8 minutes Pb-free reflow, maximum 3
Power dissipated in tripped state Pd 0.6 W Tripped state, 20°C still air 1
Trip-time reference temperature liquidus TL 217 °C Pb-free reflow, time maintained above TL 3
Thermal shock resistance change -30 % MIL-STD-202 Method 107, +85°C/-40°C 20 times; typical resistance change 3

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts Copper Terminal Material Solder-Plated Copper (Solder Material: 3

CAD (KiCad official)

  • Symbol: 1206L050YR
  • Footprint: Fuse:Fuse_1206_3216Metric
  • 3D model: 1206 (KiCad packages3D, STEP)
  • 3D model files: 1206l050yr-etched.step / 1206l050yr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1206l050yr.step / 1206l050yr.glb are the bare package body.

Provenance

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

  • Datasheet: Littelfuse datasheet (6 pp, sha256 e7684db822499dee, 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