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R251.750 Datasheet(PDF) 1 Page - Littelfuse |
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R251.750 Datasheet(HTML) 1 Page - Littelfuse |
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1 / 1 page Subminiature Axial Lead and Cartridge Fuses PICO® II Very Fast-Acting Fuse 251/253 280 www .littelfuse .com The PICO® II very fast-acting fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. ELECTRICAL CHARACTERISTICS: % of Ampere Ampere Opening Rating Rating Time 100% 1/16 –15 4 hours, Minimum 1/16 –7 1 second, Maximum 200% 10 3 seconds, Maximum 12 –15 10 seconds, Maximum AGENCY APPROVALS: Recognized under the Components Program of Underwriters Laboratories and Certified by CSA. Approved by METI from 1 through 5 amperes. AGENCY FILE NUMBERS: UL E10480, CSA LR 29862. REFERENCE TO MIL SPEC: Available in FM10 on QPL for MIL-PRF-23419. To order, change 251 to 253 as shown below. INTERRUPTING RATINGS: 300 amperes at rated voltage VDC. 50 amperes at rated voltage VAC. ENVIRONMENTAL SPECIFICATIONS: Operating Temperature: –55°C to 125°C. Shock: MIL-STD-202, Method 213, Test Condition I (100 G’s peak for 6 milliseconds). Vibration: MIL-STD-202, Method 201 (10–55 Hz); Method 204, Test Condition C (55–2000 Hz at 10 G’s Peak). Moisture Resistance: MIL-STD-202, Method 106. PHYSICAL SPECIFICATIONS: Materials: Encapsulated, Epoxy-Coated Body; Solder Coated Copper Wire Leads. Flammability Rating: UL 94V0 Soldering Parameters: Wave Solder — 260°C, 10 seconds maximum. Solderability: MIL-STD-202, Method 208. Lead Pull Force: MIL-STD-202, Method 211, Test Condition A (will withstand a 7 lb. axial pull test). PACKAGING SPECIFICATIONS: Tape and Reel per EIA-296; T1: 2.062" (52.4mm) taped spacing; 5,000 per reel. Option: Radial Lead Version; 0.4" lead spacing; to order, change 251 to 252. PATENTED ORDERING INFORMATION: 100 10 1 0.1 0.01 0.001 0.05 0.1 1 10 100 1000 CURRENT IN AMPERES Std. Type Mil. Type Nominal Nominal Catalog Catalog Ampere Voltage Resistance Melting I2t Number Number Rating Rating Cold Ohms A2 Sec. R251.062 R253.062 1/16 125 7.0 0.000113 R251.125 R253.125 1/8 125 1.70 0.00174 R251.250 R253.250 1/4 125 0.665 0.0116 R251.375 R253.375 3/8 125 0.395 0.0296 R251.500 R253.500 1/2 125 0.280 0.0598 R251.750 R253.750 3/4 125 0.175 0.153 R251 001 R253 001 1 125 0.128 0.256 R251 01.5 R253 01.5 11/2 125 0.0823 0.587 R251 002 R253 002 2 125 0.0473 0.405 R251 02.5 21/2 125 0.0360 0.721 R251 003 R253 003 3 125 0.0290 1.19 R251 03.5 31/2 125 0.0240 1.58 R251 004 R253 004 4 125 0.0204 2.45 R251 005 R253 005 5 125 0.0155 4.14 R251 007 R253 007 7 125 0.0105 10.4 R251 010 R253 010 10 125 0.00705 25.5 R251 012 12 32 0.0055 45.2 R251 015 R253 015 15 32 0.00446 68.8 Average Time Current Curves F L 1 A 38.1 (1.5") 38.1 (1.5") 7.11 (.280") REF. EPOXY COATING 0.64 (.025") DIA. 2.41 (.095") DIA. REF. NOTE: .025" diameter for 1/16 –10A, .032" diameter for 12 –15A. Note: Higher Ampere Ratings Available. Contact Technical Assistance for Details ® ® QPL Next Previous |
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