SMM BEL | Alldatasheet
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Technical content
SMMD Sept.,2010 Catalog Number Ampere Rating Typical Cold Resistance Volt-drop @100% In Melting I²t @10 In Maximum Power (ohm) (Volt) max. (A²Sec) min. Dissipation (W) SMM 20 20A 0.0025 0.09 270 1.8 SMM 25 25A 0.0019 0.08 420 2.0 SMM 30 30A 0.0013 0.07 1000 2.1
Electrical Characteristics
100% 4 hrs N/A 200% N/A 60 sec Approvals Safety Agency Approvals Physical Specification Materials Soldering Guidelines Ceramic Body / Matte Tin Plated Brass Caps Reflow Conditions Recommended: 240° C, 30 sec. max. Marking Pb-Free Process Compatibility: 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). Mechanical Dimensions 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° C to +125° 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° C to +85° C Max. 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. When soldered to test boards using IR reflow in accordance with JEDEC J-STD-020 (260° C, 40 sec. max.), SMM samples exhibited DCR change of +10% to -20% from initial values. Subsequent tests showed all samples complied with the stated electrical characteristics on this data sheet. On fuse: "bel", "Current Rating" in black Amp range / I.R. ability @ Volt Blow Time Testing Current 20A - 30A / 100A@ 250V AC resistive 150A@125V AC resistive 300A@ 65V DC resistive Recognized File No. E20624 Consult manufacturer for other ratings 'On label: " bel ", " SMM ", Current Rating , Voltage Rating , Interrupting Rating , Safety Logo and " "," "(China RoHS compliant) 2,000 fuses in 13 inches dia. reel, 16mm wide tape, 8mm pitch, per EIA Standard 481 Type SMM Square Ceramic Surface Mount Medium Blow Fuse
3812 Size
2.0±0.2mm (0.08''±0.008'') 3.8mm (0.15") 5.6mm (0.22") 9.8±0.2mm (0.39''±0.008'') 3.1±0.1mm (0.12''±0.004'') 3.1±0.1mm (0.12''±0.004'') 4.1mm (0.16")
SMMC Sept.,2010 Mechanical Dimensions Type SMM Square Ceramic Surface Mount Medium Blow Fuse SMM - TIME CURRENT CHARACTERISTIC CURVE 0.01 0.1 100 1000 10000 100000 10 100 1000 CURRENT IN AMPERES TIME IN SECONDS 20A 25A 30A