Fuse Mounting Accessories Page 121 Fuse & Mounting Accessories

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/03/17 Radial Lead Fuses MICRO > Very Fast-Acting Fuse > 272/273/274/278/279 Series Average Time Current Curves 100 10 1 0.1 0.01 0.001 1 10 100 0.01 0.1 0.005 1/64 A 1/100 A 1/200 A 1/32 A 1/16 A 1/8 A 1/4 A 1/2 A 3/4 A 1 A 1 1/2 A 2 A 3 A 4 A 5 A TIME IN SECONDS CURRENT IN AMPERES Temperature Re-rating Curve Soldering Parameters - Wave Soldering Dwell Time 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 Time (Seconds) Temperature (C) - Measured on bottom side of board Cooling Time Preheat Time Wave Parameter Lead-Free Recommendation Preheat: (Depends on Flux Activation Temperature) (Typical Industry Recommendation) Temperature Minimum: 100 C Temperature Maximum: 150 C Preheat Time: 60-180 seconds Solder Pot Temperature: 260 C Maximum Solder Dwell Time: 2-5 seconds Recommended Hand-Solder Parameters: Solder Iron Temperature: 350 C +/- 5C Heating Time: 5 seconds max. Note: These devices are not recommended for IR or Convection Reflow process. Recommended Process Parameters: Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation.

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