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KYOCERA AVX F1206B0R25FSTR — Circuit Protection

F1206B0R25FSTR 250mA 63V Fast Blow Fuse

MPNF1206B0R25FSTR
Active

KYOCERA AVX Accu-Guard® II series, F1206B0R25FSTR, 250 mA, 63 V DC, fast blow, 1206 SMD, 50 A breaking capacity, 0.75 Ω cold resistance, -55°C to 125°C.

$0.8100Ref. price · indicative, final on quote
KYOCERA AVX F1206B0R25FSTR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

F1206B0R25FSTR specifications
ParameterValue
SeriesAccu-Guard® II
Fuse typeBoard Mount (Cartridge Style Excluded)
MountingSurface Mount
Voltage rating - DC63 V
Breaking capacity @ rated voltage50A
Current rating250 mA
Response timeFast Blow
Operating temperature-55°C~125°C
Size (Dimension)0.122\" L x 0.063\" W x 0.047\" H (3.10mm x 1.60mm x 1.20mm)
Approval agencycUL, UL
PackageTape & Reel (TR); Cut Tape (CT)
Melting i2t3E-05
Case1206 (3216 Metric)
DC cold resistance0.75 Ohms

Product details

250 mA at 63 V — secondary-side rail protection

The F1206B0R25FSTR is a 250 mA, 63 V DC fast-blow fuse in the 1206 SMD footprint, part of the Accu-Guard® II series from KYOCERA AVX. Its 50 A breaking capacity at rated voltage covers most secondary-side DC rails in telecom, industrial control, and power-distribution boards.

Melting I²t and cold resistance — inrush and drop

With a melting I²t of 3E-05, this fuse opens fast on a hard short but may nuisance-blow if the load's capacitive inrush exceeds that energy — check the start-up profile against the I²t curve in the datasheet. The DC cold resistance is 0.75 Ohms, producing a 187.5 mV drop at rated current; for a 3.3 V rail that is a 5.7 % loss, so factor this into the supply budget for low-voltage circuits.

Active production — standard sourcing

Temperature grade and approvals

Carries cUL and UL approval agency marks.

Frequently asked questions

Is the F1206B0R25FSTR a direct replacement for other 250 mA 1206 fuses?

Many 250 mA 1206 fuses exist, but the Accu-Guard® II series has its own I²t, resistance, and breaking capacity profile. Verify the melting I²t (3E-05) and cold resistance (0.75 Ohms) against the original BOM fuse to confirm fit — a direct replacement claim requires matching those parameters, not just the package and current rating.