451 LITTELFUSE | Alldatasheet
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www.littelfuse.com Subminiature Surface Mount NANO2® FUSE Very Fast-Acting 451/453 Series The Nano2 SMF Fuse is a very small, square surface mount fuse that is also available in a surface mount holder. ELECTRICAL CHARACTERISTICS: % of Ampere Ampere Opening Rating Rating Time 100% 1/16 –15 4 hours, Minimum 200% 1/16–10 5 seconds, Maximum 12–15 20 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. INTERRUPTING RATINGS: 1/16 – 8A 50 amperes at 125 VAC/VDC 300 amperes at 32 VDC 10A 35 amperes at 125 VAC/50 amperes at 125 VDC 300 amperes at 32 VDC 12A – 15A 50 amperes at 65 VAC/VDC 300 amperes at 24 VDC 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). Salt Spray: MIL-STD-202, Method 101, Test Condition B. Insulation Resistance (After Opening): MIL-STD-202, Method 302, Test Condition A, (10,000 ohms minimum). Resistance to Soldering Heat: MIL-STD-202, Method 210, Test Condition B (10 sec. at 260°C). Thermal Shock: MIL-STD-202, Method 107, Test Condition B (–65 to 125°C). Moisture Resistance: MIL-STD-202, Method 106, High Humidity (90-98 RH), Heat (65°C). 100 0.1 0.01 0.001 1/16A 1/8A 1/4A 3/8A 1/2A 3/4A 1 1/2A 2 1/2A 3 1/2A 10A 12A 15A 0.05 0.1 1 10 100 1000 TIME IN SECONDS CURRENT IN AMPERES Average Time Current Curves F 7 A 6.86 (.270") 3.15 (.124") 2.95 (.116")1.96 (.077") 2.69 (.106") 2.69 (.106") 1.45 (.057") 6.10 (.240") Recommended pad layout Tin-Lead Silver Nominal Nominal Plated Plated Ampere Voltage Resistance Melting I 2t Catalog # Catalog # Rating Rating Cold Ohms A 2 Sec. – R451.062 0.062 125 5.50 0.00019 – R451.080 0.080 125 4.05 0.00033 – R451.100 0.100 125 3.10 0.00138 – R451.125 0.125 125 1.70 0.00286 R451 004. 0453 004. 4 125 0.0160 3.152 R451 005. 0453 005. 5 125 0.0125 5.566 R451 007. 0453 007. 7 125 0.0090 10.32 R451 008. 0453 008. 8 125 0.0077 20.23 R451 010. 0453 010. 10 125 0.0056 26.46 R451 012. 0453 012. 12 65 0.0049 47.97 R451 015. 0453 015. 15 65 0.0037 97.82 PHYSICAL SPECIFICATIONS: Materials: Body: Ceramic Terminations: Tin-Lead Alloy or Silver Plated Caps. Soldering Parameters: Wave Solder — 260°C, 10 seconds maximum Reflow Solder — 260°C, 30 seconds maximum Solderability: MIL-STD-202, Method 208. PACKAGING SPECIFICATIONS:12mm Tape and Reel per EIA- RS481-1 (IEC 286, part 3); 1,000 per reel, add packaging suffix, MR; 5,000 per reel, add packaging suffix NR. PATENTED ® ® Refer to pg. 271 for SMF Omni-Blok® Holder, Series 154 000.