030801.5UR

Special Application Fuses Intrinsically Safe > Surface Mount > 308 Series 308 Series 30V Intrinsically Safe Fuse Pb RoHS Description The 308 Series offers a range of surface mountable encapsulated fuses certified as intrinsically safe components that can be used in hazardous locations. Ideal for use in oil, gas, mine, chemical, pharmaceutical and process industries, the 308 Series surface mountable fuse was designed to limit the energy and temperature generated during its operation. The fuse design and its encapsulant are suitable for use in intrinsically safe apparatus and associated apparatus for peak voltage not exceeding 30V. Features • Surface Mountable • Suitable for use in Class I, Groups A, B, C and • Encapsulated and sealed D; Class II, Groups E, (0.7mm minimum) F and G; Class III and • Designed for operation in Class I, Zone 0, AEx ia IIC a range of hazardous area Hazardous Locations. applications requiring • Suitable for use in Gas, 30V peak Zone 0 Hazardous • RoHS-compliant and leadLocations per IEC and EN free 60079 Series • Fully compatible with lead-free solder alloys and higher temperature profiles associated with lead-free assembly Agency Approvals Agency Agency File Number Ampere Rating DEMKO 15 ATEX 1439U (II 1 G Ex ia IIC) 0.250A – 1.5A E358130 0.250A – 1.5A IECEx UL 15.0011U (Ex ia IIC) 0.250A – 1.5A Reference Standards Certification Standards ATEX EN 60079-0, EN 60079-11 IECEx IEC 60079-0, IEC 60079-11 UL 913, UL 60079-0, UL 60079-11 CAN/CSA C22.2 No. 157, CAN/CSA C22.2 No. 60079-0, CAN/CSA C22.2 No. 60079-11 UL cUL Electrical Characteristics for Series % of Ampere Rating Opening Time 100% 4 Hours, Minimum 250%* 120 Seconds, Maximum 350%** 60 Seconds, Maximum Applications • Testing, measuring or processing electronic and electrical equipment • Motor controllers • Communication handsets/ two-way radios • Process control and automation • Sensors • Lighting • Flow/gas meters * Applicable to 750mA - 1.5A ** Applicable to 250mA - 1.5A Electrical Specifications by Items Catalog Number Ampere Rating (A) Amp Code Interrupting Rating Nominal Melting 2 I t (A2 Sec.) Minimum Cold Resistance at -20°C (Ohms) Minimum Cold Resistance at -40°C (Ohms) Nominal Cold Resistance at 25°C (Ohms) Agency Approvals 308.25 0.25 0.25 0.004 1.856 1.821 2.29 X X X 308.375 0.375 0.375 0.01 1.022 1.006 1.33 X X X 308.5 0.5 0.5 0.022 0.712 0.676 0.908 X X X 308.75 0.75 0.75 0.048 0.52 0.511 0.665 X X X 308001.0 1.0 1.0 0.1 0.226 0.216 0.42 X X X 3081.25 1.25 1.25 0.22 0.24 0.236 0.318 X X X 30801.5 1.5 1.5 0.333 0.182 0.144 0.209 X X X 50A@24VAC 50A@30VDC Notes: 1. The fuse must be mounted so that creepage and clearance distances aren’t impaired in any way. 2. The fuse is suitable for use in intrinsically safe equipment and associated apparatus for voltage not exceeding 30V peak. 3. Maximum surface temperature rise at 170% rated current: 250-375mA = 23°C, 500mA = 35°C, 750mA = 53°C, 1A = 38°C, 1.25-1.50A = 96°C. 4. Minimum Cold Resistance at -30°C is available upon request. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/14/20 Special Application Fuses Intrinsically Safe > Surface Mount > 308 Series 1.5A 0.750A 1.25A 1.00A 0.250A 140 0.375A Average Time Current Curves 0.500A Temperature Rerating Curve 100.000 PERCENT OF RATING 120 100 80 10.000 60 -85 -65 -45 -25 -5 15 35 55 75 95 115 135 Time in Seconds 40 155 TEMPERATURE (ºC) 1.000 Notes: 1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for continuous operation. Example: For continuous operation at 55°C, the fuse should be rerated as follows: I = (0.80)(0.90)IRAT = (0.72)IRAT 0.100 2. The temperature rerating curve represents the nominal conditions. For questions about temperature rerating curve, please consult Littelfuse technical support for assistance. 0.010 0.001 0.01 0.1 1 10 100 Current in Ampers Soldering Parameters Pre Heat Pb – Free assembly - Temperature Min (Ts(min)) 150°C - Temperature Max (Ts(max)) 200°C - Time (Min to Max) (ts) 60 – 180 secs Average ramp up rate (Liquidus Temp (TL) to peak 3°C/second max. TS(max) to TL - Ramp-up Rate 3°C/second max. Reflow - Temperature (TL) (Liquidus) 217°C - Temperature (tL) 60 – 150 seconds Peak Temperature (TP) 260+0/–5 °C Time within 5°C of actual peak Temperature (tp) 30 Sec Max Ramp-down Rate 6°C/second max. Time 25°C to peak Temperature (TP) 8 minutes max. Do not exceed - tP TP Critical Zone TL to TP Ramp-up Temperature Reflow Condition TL T S(max) tL Ramp-down T S(min) Preheat tS 25 time to peak temperature (t 25ºC to peak) Time © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/14/20 Special Application Fuses Intrinsically Safe > Surface Mount > 308 Series Part Marking System Dimensions (mm) Marking Code Amp Code D 0.250 GATE 3.65 +0.14 - 0.15 SEE MARKING CODE 5.40 +0.14 - 0.02 3.80 +0.14 - 0.15 E 0.375 F 0.500 G 0.750 H 001.0 J 1.25 K 01.5 2.04 [REF] 0. 20 MIN +0.50 2.20 -0.20 RECOMMENDED PCB LAND PATTERN 2.34 2.45 2.0 Part Numbering System Product Characteristics 0308 001. U R Ambient Temperature 1 2 Polyamide 6T/66 CTI 100 volts minimum Continuous Operating Temperature: 140°C -40°C to +70°C Terminations Tin-Plated Silver-Plated Copper Thermal Shock Withstands 100 cycles of -55°C to 125°C Vibration MIL-STD-202, Method 201 Mechanical Shock MIL-STD-202, Method 213, Condition A Moisture Resistance MIL-STD-202, Method 106 Salt Spray Resistance to Soldering Heat MIL-STD-202, Method 101, Condition B Molding Material Series Amp Code Refer to Electrical Specifications table Quantity Code U = 500 pcs Packaging code R = Tape and Reel MIL-STD-202, Method 210, Condition K Notes: 1. Any use of the 308 Series fuse outside of the ambient temperature range specified in the table is subject to additional investigation. 2. Specified ambient temperature range is for intrinsic safety certification. Packaging Packaging Option 12mm Tape and Reel Packaging Specification EIA 481-1 Quantity 500 Quantity and Packaging Code UR Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 10/14/20