Obsolete — sourcing the 1206SFF175F/63-2 on the spot market
Littelfuse has marked the 1206SFF175F/63-2 as obsolete. No official successor order code is listed, so the only channel is independent surplus and excess inventory. This is a last-time-buy situation: once the remaining stock in the distribution pipeline and on broker shelves is gone, the part is gone. Any BOM that still carries this line item needs a confirmed source now.
1.75 A fast-blow in a 1206 footprint — what the ratings mean
Rated 1.75 A continuous at 63 VDC, this is a fast-blow fuse — it opens quickly on overcurrent, not on sustained low-level overloads. The 50 A breaking capacity at the rated voltage means it can safely interrupt a fault current up to that level without rupturing the ceramic body. The 0.045 melting I²t is the energy needed to clear the element. For a 1.75 A rail, this is a low I²t value — the fuse responds fast to short-circuit pulses, which matters when protecting a sensitive load that cannot ride through a long arc. DC cold resistance is 0.1 Ohms. At 1.75 A, the resistive voltage drop is 175 mV — negligible for a 63 V rail but worth checking if the load is a low-voltage sensor that sees the fuse drop as a supply sag.
1206 footprint and surface-mount integration
Standard 1206 (3216 metric) chip footprint, surface-mount. Tape & Reel and Cut Tape packaging — the reel quantity is standard for the SFF series. The UL recognition covers the fuse's safety performance in the end equipment.