component

1206L400SLWR

Public Made by Adom

by adom

Littelfuse Resettable Fuses, 1206. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.

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1206L400SLWR

Littelfuse · Resettable Fuses · 1206

1206L400SLWR 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 Terminal 1 of an unpolarised fuse; either orientation.
2 2 passive Terminal 2 of an unpolarised fuse; either orientation.

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 (Rmin) Rmin 0.001 Ω 2
Maximum resistance after trip (R1max) R1max 0.016 Ω 2
Maximum voltage (V max) V max 6 Vdc 2
Maximum interrupt current (I max) I max 50 A 2
Maximum time-to-trip current 20 A Time-to-trip time 2.00 s 2
Hold current I hold 4 A 2
Trip current I trip 8 A 2
Power dissipation (typical) P d typ. 0.8 W 2
Passive aging resistance change -10 10 % Passive aging +85°C, 1000 hours; typical resistance change 6
Humidity aging resistance change -15 15 % Humidity aging +85°C, 85% R.H., 100 hours; typical resistance change 6
Thermal shock resistance change -30 % MIL-STD-202 Method 107, +85°C/-40°C, 20 times; typical resistance change 6
Operating temperature range -40 85 °C 6
Maximum device surface temperature in tripped state 125 °C Tripped state 6
Peak / classification temperature (TP) TP -5 260 0 °C Pb-free assembly; printed as 260 +0/-5 °C 6
Average ramp-up rate (TS(max) to TP) 3 °C/second Pb-free assembly 6
Ramp-down rate 6 °C/second Pb-free assembly 6
Time 25°C to peak temperature (TP) 8 minutes Pb-free assembly 6
Preheat temperature Ts 150 200 °C Pb-free assembly, Ts(min) to Ts(max) 6
Preheat time ts 60 180 seconds Pb-free assembly, time from Ts(min) to Ts(max) 6
Time maintained above liquidus temperature tL 60 150 seconds Pb-free assembly, above TL = 217 °C 6
Liquidus temperature TL 217 °C Pb-free assembly 6
Time within 5°C of actual peak temperature tp 20 40 seconds Pb-free assembly 6

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 6

CAD (KiCad official)

  • Symbol: 1206L400SLWR
  • Footprint: Fuse:Fuse_1206_3216Metric
  • 3D model: 1206 (KiCad packages3D, STEP)
  • 3D model files: 1206l400slwr-etched.step / 1206l400slwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1206l400slwr.step / 1206l400slwr.glb are the bare package body.

Provenance

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

  • Datasheet: Littelfuse datasheet (13 pp, sha256 8812672c2cc1e8cf, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary two-terminal convention (convention), consensus off (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