EOL-Last Buy Date is June 30, 2019 Not recommended for new applications. Please see 0678L Type SMM Square Ceramic Surface Mount Medium Blow Fuse SMM Series 3912 Size RoHS 2 Compliant Features - Medium Blow - Surface mount high current fuse - Current rating from 10A to 30A - Wide operating temperature range from -55 to 125 - Tape & Reel for auto-insert SMD process - Compatible with reflow process - Halogen Free - Lead Free Applications - Voltage regulator module - PC server - Office electronic equipment - Industrial equipment - Medical equipment LEAD FREE = - POE, POE+ HALOGEN FREE = - Power supply - DC-DC Converter Electrical Characteristics (UL/CSA/STD.248-14) Safety Agency Approvals Blow Time Testing Safety Safety Agency Voltage Rating Ampere Range / Volt Current Agency Certificate (V) I.R. ability* Minimum Maximum 100% 4 Hrs. N/A 10A-30A/250V 100A AC 200% N/A 60 Sec 10A-30A/250VAC 1 25V 150A AC E20624 72 VDC 72V 130A DC 65V 300A DC *I.R.= Interrupting Rating = Short Circuit Rating(Amps) Physical Specifications Body : Ceramic Materials Terminations : Matte Tin plated Brass Caps On Fuse : be,Current Ratin in black color. On Label : Marking be,SM,Current Ratin,Voltage Ratin,Interrupting Ratin, Appropriate Safety Logo and , (China RoHS compliant). Specifications subject to change without notice belfuse.com/circuit-protection EOL-Last Buy Date is June 30, 2019 Not recommended for new applications. Please see 0678L 2 / 4 Type SMM Environmental Specifications MIL-STD-202G, Method 213B, Test Condition 1 Shock Resistance (100 G s peak for 6 milliseconds Sawtooth waveform) 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). MIL-STD-202G, Method 302, Test Condition A Insulation Resistance (After Opening) 10,000 ohms minimum. Solderability MIL-STD-202G, Method 208H Resistance to solder Heat MIL-STD-202G, Method 210F MIL-STD-202G, Method 107G, Test Condition B Thermal Shock (-65 to +125). Operating Temperature -55 to +125 Moisture Sensitivity Level 1 ( Peak Temperature at 240 for 30 seconds max ) Electrical Specifications Agency Nominal Nominal Melting IT Nominal Approvals Voltage and Catalog Ampere Cold Volt-drop 10 In Power Interrupting Rating Resistance 100% In Number (ASec) Dissipation Ratings (ohms) (Volt) max. Min. (W) SMM 10 10A 0.0056 0.18 50 1.8 Y See Table of Safety SMM 15 15A 0.0036 0.12 110 1.8 Y Approvals on Page 1 SMM 20 20A 0.0025 0.09 for Voltage and 270 1.8 Y associated SMM 25 25A 0.0019 0.08 420 2.0 Y Interrupting Ratings SMM 30 30A 0.0013 0.07 1000 2.1 Y Consult manufacturer for other ratings Soldering Guidelines Reflow Conditions Recommended 240, 30 sec. max. When soldered to test boards using IR reflow in accordance with above 240 , SMM samples exhibited DCR change of + 10% to - 20% from initial values, the fuse may emit solder. Subsequent tests showed all samples complied with the stated electrical characteristics on this data sheet. 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 0.1mm nominal thickness (3 oz. clad), 10mm wide and 100mm 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 in a 21 ambient (79 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 SMM 30 rating was 69 (48 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 0peration at currents in this range may result in overheating of the fuse and/or desoldering of the fuse caps from the PCB pad . Specifications subject to change without notice Bel Fuse Inc. +1 201.432.0463 206 Van Vorst Street Bel.US.CS belf.com Jersey City, NJ 07302 USA belfuse.com/circuit-protection 2019 Bel Fuse, Inc. Rev. SMM Jun2019