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| Type SMM Square Ceramic Surface Mount Medium Blow Fuse SMMD Sept.,2010 Catalog Ampere Typical Cold Volt-drop Number Rating Resistance @100% In (ohm) SMM 20 SMM 25 SMM 30 20A 25A 30A 0.0025 0.0019 0.0013 Melting It @10In 3812 Size RoHS6 Compliant Pb Maximum Power Dissipation (W) 1.8 2.0 2.1 (Volt) max. (ASec) min. 0.09 0.08 0.07 270 420 1000 Consult manufacturer for other ratings Electrical Characteristics Testing Current 100% 200% Blow Time Minimum 4 hrs N/A Maximum N/A 60 sec Approvals Safety Agency Approvals Recognized File No. E20624 Amp range / I.R. ability @ Volt 20A - 30A / 100A@ 250V AC resistive 150A@125V AC resistive 300A@ 65V DC resistive Physical Specification Materials Ceramic Body / Matte Tin Plated Brass Caps Marking On fuse: "bel", "Current Rating" in black 'On label: "bel", "SMM", Current Rating, Voltage Rating, Interrupting Rating, Safety Logo and " "," "(China RoHS compliant) Soldering Guidelines Reflow Conditions Recommended: 240 30 sec. max. C, Pb-Free Process Compatibility: When soldered to test boards using IR reflow in accordance with JEDEC J-STD-020 (260 40 sec. max.), SMM samples exhibited DCR change of C, +10% to -20% from initial values. Subsequent tests showed all samples complied with the stated electrical characteristics on this data sheet. NOT Recommended for Wave solder / Direct immersion / Hand Solder Packaging Environmental Specification Shock Resistance MIL-STD-202G, Method 213B, Test Condition I (100 G's peak for 6 milliseconds). Vibration Resistance MIL-STD-202G, Method 201A (10-55 Hz, 0.06 inch, total excursion). Salt Spray Resistance MIL-STD-202G, Method 101E, Test condition B (48 hrs). Thermal Shock Resistance MIL-STD-202G, Method 107G, Test Condition B (-65 to +125 C C) Insulation Resistance: MIL-STD-202G, Method 302, Test Condition A (After Opening) 10,000 ohms minimum Solderability: MIL-STD-202G, Method 208H Soldering Heat Resistance: MIL-STD-202G, Method 210F Operating Temperature -55 to +85 Max. C C 2,000 fuses in 13 inches dia. reel, 16mm wide tape, 8mm pitch, per EIA Standard 481 Mechanical Dimensions 3.10.1mm (0.12''0.004'') 3.10.1mm (0.12''0.004'') 9.80.2mm (0.39''0.008'') 3.8mm (0.15") 4.1mm (0.16") 2.00.2mm (0.08''0.008'') 5.6mm (0.22") NOTES: - TEST CONDITIONS For all SMM data, as well as UL Component investigation, all tests were conducted with fuse samples soldered on a PCB (1.6mm thick) test board with copper traces measuring 0.1 mm nominal thickness (3 oz.clad), 10mm wide and 100 mm overall length. - UL Condition of Acceptability - the following information is contained in the UL Component Recognition for SMM Fuse Series: The maximum temperature recorded in open air was 100 oC in a 21 oC ambient (79 oC rise). Consideration should be given to checking operating temperatures in end-use application with regard to thermal index of surrounding materials and components. (Maximum temperature recorded at 80% of rating (24A) for the SMM30 rating was 69 C (48 C rise). CAUTION: - MINIMUM FUSING POINT : The SMM Series fuses are NOT intended to be operated at currents between 100% and 200% of ampere rating. Prolonged operation at currents in this range may result in overheating of the fuse and/or desoldering of the fuse caps from the PCB pad. Type SMM Square Ceramic Surface Mount Medium Blow Fuse 3812 Size RoHS6 Compliant Pb SMMC Sept.,2010 SMM - TIME CURRENT CHARACTERISTIC CURVE 20A 25A 30A 100000 10000 1000 100 TIME IN SECONDS 10 1 0.1 0.01 10 100 1000 CURRENT IN AMPERES |
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