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Contents

Pinout
Key specifications
Electrical characteristics
Materials and finish
CAD (KiCad official)
Provenance

README

markdown

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