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Littelfuse Inc. 1206SFS250F/32-2 — Circuit Protection

1206SFS250F/32-2 Littelfuse SFS Fuse, 2.5A 32V Slow Blow

MPN1206SFS250F/32-2
Obsolete

Littelfuse Inc. SFS series, Board Mount Surface Mount Fuse, 1206 (3216 Metric), 2.5 A, 32 V DC, Slow Blow, 50 A Breaking Capacity @ Rated Voltage.

$0.9000Ref. price · indicative, final on quote
Littelfuse Inc. 1206SFS250F/32-2 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

1206SFS250F/32-2 specifications
ParameterValue
SeriesSFS
Fuse typeBoard Mount (Cartridge Style Excluded)
MountingSurface Mount
Voltage rating - DC32 V
Breaking capacity @ rated voltage50A
Current rating2.5 A
Response timeSlow Blow
Operating temperature-55°C ~ 125°C
Size (Dimension)0.126\" L x 0.063\" W x 0.038\" H (3.20mm x 1.60mm x 0.97mm)
Approval agencyUL
PackageTape & Reel (TR) Cut Tape (CT)
Melting i2t0.9
Case1206 (3216 Metric)
DC cold resistance0.065 Ohms

Product details

2.5 A slow blow in a 1206 footprint

The Littelfuse 1206SFS250F/32-2 is a 2.5 A, 32 V DC surface-mount fuse from the SFS series, packaged in a standard 1206 (3216 metric) chip format. Its slow-blow characteristic means it tolerates brief inrush currents without nuisance opening — the element absorbs energy up to the 0.9 melting I²t rating before the fuse clears. Rated breaking capacity is 50 A at 32 V DC, sufficient for interrupting low-energy DC faults typical in battery-powered or secondary-side circuits. The 0.065 ohm DC cold resistance keeps voltage drop low at rated current — about 160 mV at 2.5 A.

Obsolete — sourcing through surplus channels

Littelfuse has marked the 1206SFS250F/32-2 as obsolete. No official successor part number is recorded. For new designs, a functionally equivalent 2.5 A, 32 V slow-blow 1206 fuse from the same or another manufacturer should be evaluated. The SFS series is the family; no pin-compatible drop-in replacement is documented by Littelfuse.

Board-level deployment context

UL recognized — the approval covers the fuse construction for use in UL 248-14 supplemental fuse applications. The slow-blow response suits circuits with capacitive inrush, motor start, or hot-plug events where a fast-acting fuse would open on the transient.

Frequently asked questions

What is the breaking capacity of this fuse?

50 A at 32 V DC. This is the maximum fault current the fuse can safely interrupt at the rated voltage. For DC circuits, the breaking capacity is a critical safety parameter — a fault exceeding this value may not clear cleanly.

What does the slow-blow response time mean for my circuit?

The slow-blow (time-delay) characteristic allows brief overcurrent pulses — such as capacitor charging current or motor inrush — to pass without opening. The 0.9 I²t melting integral quantifies the energy needed to melt the element; a transient below this threshold leaves the fuse intact.