SMM20

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 I²t @10In 3812 Size RoHS6 Compliant Pb Maximum Power Dissipation (W) 1.8 2.0 2.1 (Volt) max. (A²Sec) 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 3.1±0.1mm (0.12''±0.004'') 3.1±0.1mm (0.12''±0.004'') 9.8±0.2mm (0.39''±0.008'') 3.8mm (0.15") 4.1mm (0.16") 2.0±0.2mm (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