Fuse Mounting Accessories Page 194 Fuse & Mounting Accessories

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/03/17 Axial Lead & Cartridge Fuses PICO ll > Very Fast-Acting Fuse > 251/253 Series Average Time Current Curves Soldering Parameters 100 10 1 0.1 0.01 0.001 .062A 0.05 0.1 1 10 100 1000 .125A .250A .375A .500A .750A .630A 1A 1.5A 2A 2.5A 3A 3.5A 4A 5A 7A 10A 12A 15A TIME IN SECONDS CURRENT IN AMPERES 1.25A Recommended Hand Soldering Parameters: Solder Iron Temperature: 350C +/- 5C Heating Time: 5 seconds max. Note: These devices are not recommended for IR or Convection Reflow process Recommended Process Parameters: Note: 1. Re-rating depicted in this curve is in addition to the standard derating of 25% for continuous operation. Temperature Re-rating Curve Wave Parameter Lead-Free Recommendation for 251 Series only Preheat: (Depends on Flux Activation Temperature) (Typical Industry Recommendation) Temperature Minimum: 100C Temperature Maximum: 150C Preheat Time: 60-180 seconds Solder Pot Temperature: 260C Maximum Solder Dwell Time: 2-5 seconds

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