Next Previous Axial Lead and Cartridge Fuses Subminiature PICO® II Very Fast-Acting Fuse 251/253 ® QPL ® 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 Rating 100% 200% Ampere Rating 1/16 –15 1/16 –7 10 12 –15 Opening Time 4 hours, Minimum 1 second, Maximum 3 seconds, Maximum 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. 38.1 (1.5") LF INTERRUPTING RATINGS: 300 amperes at rated voltage VDC. 50 amperes at rated voltage VAC. 0.64 (.025") DIA. 38.1 (1.5") 1A 2.41 (.095") DIA. REF. EPOXY COATING 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. 7.11 (.280") REF. NOTE: .025" diameter for 1/16 –10A, .032" diameter for 12 –15A. 1/4A 3/8A 1/2A 3/4A 1A 1 1/2A 2A 2 1/2A 3A 3 1/2A 4A 5A 7A 10A 12A 15A 100 Wire Leads. 1/8A PHYSICAL SPECIFICATIONS: Materials: Encapsulated, Epoxy-Coated Body; Solder Coated Copper 1/16A Average Time Current Curves 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 10 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: Std. Type Catalog Number R251.062 R251.125 R251.250 R251.375 R251.500 R251.750 R251 001 R251 01.5 R251 002 R251 02.5 R251 003 R251 03.5 R251 004 R251 005 R251 007 R251 010 R251 012 R251 015 Mil. Type Catalog Number R253.062 R253.125 R253.250 R253.375 R253.500 R253.750 R253 001 R253 01.5 R253 002 R253 003 R253 004 R253 005 R253 007 R253 010 R253 015 Ampere Rating 1/16 1/8 1/4 3/8 1/2 3/4 1 11/2 2 21/2 3 31/2 4 5 7 10 12 15 Voltage Rating 125 125 125 125 125 125 125 125 125 125 125 125 125 125 125 125 32 32 Nominal Resistance Cold Ohms 7.0 1.70 0.665 0.395 0.280 0.175 0.128 0.0823 0.0473 0.0360 0.0290 0.0240 0.0204 0.0155 0.0105 0.00705 0.0055 0.00446 Nominal Melting I 2t A2 Sec. 0.000113 0.00174 0.0116 0.0296 0.0598 0.153 0.256 0.587 0.405 0.721 1.19 1.58 2.45 4.14 10.4 25.5 45.2 68.8 TIME IN SECONDS withstand a 7 lb. axial pull test). 1 0.1 0.01 0.001 0.05 0.1 Note: Higher Ampere Ratings Available. Contact Technical Assistance for Details 280 w w w. l i t t e l f u s e . c o m 1 10 100 CURRENT IN AMPERES 1000