Surface Mount Fuses NANO2® > Very Fast-Acting Fuse > 451/453 Series 451/453 Series Fuse RoHS PS E Description The Nano2® SMF Fuse is a very small, Wire-in-Air (WIA) square shape surface mount fuse that was designed for secondary side circuit over-current protection applications. These fuses are designed for PCB using surface mount technology. Features • Very fast-acting • UL Listed and Recognized to UL/CSA/ • Small size NMX UL 248-1 and UL/ • Wide range of current CSA/NMX UL 248-14 Agency Approvals rating available (see Agency Approvals) (0.062A to 20A) • Conforms to DENAN’s Agency Agency File Number Ampere Range • Wide operating Appendix 3 E10480 6.3A - 20A temperature range • Conforms to EN 60127-1 29862 0.062A - 15A • RoHS compliant and and EN 60127-7 1A, 1.25A, 2A, 2.5A, Halogen Free J50446731 3.15A, 4A, 5A, 7A, 8A, 10A, 12A, 20A NBK030205-E10480A 1A-1.6A Applications PS NBK030205-E10480B 2A-5A E NBK101105-E184655 6.3A - 10A • Notebook PC • Storage system E10480 0.062A - 5A • LCD/PDP TV • Telecom system 1A, 1.25A, 2A, 2.5A, NA 3.15A, 4A, 5A, 7A, 8A, • LCD monitor • Wireless basestation 10A, 12A, 20A • LCD/PDP panel • White goods • LCD backlight inverter • Game console Electrical Characteristics for Series • Portable DVD player • Office Automation equipment % of Ampere Rating Ampere Rating Opening Time • Power supply • Battery charging circuit 100% 0.062 – 20 4 hours, Minimum • Networking protection 0.062 – 10 5 sec., Maximum 200% • PC server 12 – 20 20 sec., Maximum • Industrial equipment • Cooling fan system Additional Information Datasheet Resources Samples 451 Series 451 Series 451 Series Datasheet Resources Samples 453 Series 453 Series 453 Series © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 11/05/20

Surface Mount Fuses NANO2® > Very Fast-Acting Fuse > 451/453 Series Electrical Specifications by Item Max Agency Approvals Ampere Nominal Cold Nominal Voltage Interrupting Rating Amp Code Resistance Melting Rating Rating (A) (V) (Ohms) I2t (A2sec) PES .062 .062 125 5.5000 0.00019 - x - x - - .080 .080 125 4.0500 0.00033 - x - x - - .100 .100 125 3.1000 0.00138 - x - x - - .125 .125 125 1.7000 0.00286 - x - x - - .160 .160 125 1.2157 0.0048 - x - x - - .200 .200 125 0.8372 0.0089 - x - x - - .250 .250 125 0.5765 0.0158 - x - x - - .315 .315 125 0.3918 0.0311 - x - x - - 50A @125VAC/VDC .375 .375 125 300A @32VDC 0.4541 0.0442 - x - x - - .400 .400 125 PSE: 100A @100VAC 0.4233 0.0551 - x - x - - .500 .500 125 0.3046 0.0824 - x - x - - .630 .630 125 0.2022 0.1381 - x - x - - .750 .750 125 0.1444 0.2143 - x - x - - .800 .800 125 0.1355 0.2654 - x - x - - 1.00 001. 125 0.0780 0.6029 - x x x x x 1.25 1.25 125 0.0780 0.664 - x x x x x 1.50 01.5 125 0.0630 0.853 - x x x - - 1.60 01.6 125 0.0580 1.060 - x x x - - 2.00 002. 125 0.0367 0.530 - x x x x x 2.50 02.5 125 0.0286 1.029 - x x x x x 3.00 003. 125 50A @125VAC/VDC 0.0227 1.650 - x x x - - 10,000A @75VDC 3.15 3.15 125 0.0215 1.920 - x x x x x 300A @32VDC 3.50 03.5 125 PSE: 100A @100VAC 0.0200 2.469 - x x x - - 4.00 004. 125 0.0160 3.152 - x x x x x 5.00 005. 125 0.0125 5.566 - x x x x x 6.30 06.3 125 50A @125VAC/VDC 0.0096 9.170 x x x - - - 7.00 007. 125 400A @32VDC 0.0090 10.32 x x x - x x 8.00 008. 125 PSE: 100A @100VAC 0.0077 20.23 x x x - x x 35A @125 VAC/ 50A @125 VDC 10.0 010. 125 0.0056 26.46 x x x - x x 400A @32 VDC PSE: 100A @100VAC 12.0 012. 65 150A @65VDC 0.0049 47.97 x x - - x x 15.0 015. 65 100A @65VAC 0.0037 97.82 x x - - - - 20.0 020. 65 400A @32VDC 0.00244 154 x - - - x x Notes: - l2t calculated at 8ms. - Resistance is measured at 10% of rated current, 25ºC © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 11/05/20

Surface Mount Fuses NANO2® > Very Fast-Acting Fuse > 451/453 Series Temperature Re-rating Curve Average Time Current Curves Fast Acting Series TC Curve 62mA80mA100mA125mA160mA200mA250mA315mA375mA400mA500mA630mA750mA800mA1A1.25A1.5A1.6A2A2.5A3A3.15A3.5A4A5A6.3A7A8A10A12A15A20A 100 10 1 DS N O C N SE ME I TI 0.1 Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 0.01 0.001 0.01 0.1 1 10 100 1000 10000 CURRENT IN AMPS Soldering Parameters Reflow Condition Pb – Free assembly t P - Temperature Min (T ) 150°C T s(min) P Critical Zone Pre Heat - Temperature Max (Ts(max)) 200°C Ramp-up TL to TP - Time (Min to Max) (t) 60 – 180 secs T s L t Average ramp up rate (Liquidus Temp (TL) to peak 5°C/second max. eruTS(max) L T to T - Ramp-up Rate 5°C/second max. ta S(max) L r Ramp-down e - Temperature (T) (Liquidus) 217°C p Preheat Reflow L mTS(min) - Temperature (tL) 60 – 150 seconds eT tS Peak Temperature (T) 260+0/–5 °C P Time within 5°C of actual peak Temperature (t) 20 – 40 seconds 25 p time to peak temperature Ramp-down Rate 5°C/second max. (t 25ºC to peak) Time Time 25°C to peak Temperature (T) 8 minutes max. P Do not exceed 260°C Wave Soldering Parameters 260°C Peak Temperature, 10 seconds max. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 11/05/20

Surface Mount Fuses NANO2® > Very Fast-Acting Fuse > 451/453 Series Product Characteristics Body: Ceramic MIL-STD-202, Method 107, Test Condition Terminations: Thermal Shock B, 5 cycles, -65°C / +125°C, 15 minutes @ each extreme Gold-Plated Caps / Sn-dipped Silver Plated Caps Materials (451 RoHS/HF series) MIL-STD-202, Method 213, Test I: Deenergized. 100G’s pk amplitude, Silver-plated Caps (451MR RoHS ratings below Mechanical Shock sawtooth wave 6ms duration, 3 cycles 375mA and 453 RoHS Series) XYZ+xyz = 18 shocks Product Marking Brand, Ampere Rating MIL-STD-202, Method 201: 0.03” Operating Temperature –55°C to 125°C Vibration amplitude, 10-55 Hz in 1 min. 2hrs each Moisture Sensitivity Level Level 1, J-STD-020 XYZ=6hrs Moisture Resistance MIL-STD-202, Method 106, 10 cycles Solderability MIL-STD-202, Method 208 MIL-STD-202, Method 101, Test Condition Insulation Resistance MIL-STD-202, Method 302, Test Condition A Salt Spray B (48hrs) (after Opening) (10,000 ohms minimum) MIL-STD-202, Method 210, Test condition Resistance to Soldering Heat B (10 sec at 260°C) Dimensions Part Numbering System 6.10 ± .20 2.69 ± .25 0451 001. M R L (.240") (.106") Series F 7 A 2.69 ± .25 451 = Gold / Sn-dipped Silver Plated Caps (.106") 453 = Silver Plated Caps 1.45 Amp Code (.057") Refer to Electrical 6.86 characteristics table (.270") Quantity code 3.15 M = 1000 pcs (.124") N = 5000 pcs 2.95 Packaging code 1.96 (.116") R = Tape and Reel (.077") L-RoHS Compliant & Halogen Free Recommended pad layout (Gold Plated Caps) SN-RoHS Compliant & Halogen Free (Sn-dipped Caps) NOTE: “L” suffix applies to 451 series only - 453 series is available only as RoHS compliant version and does not require “L” suffix. Please do not include “L” suffix within 453 series ordering instructions. Packaging Quantity & Packaging Option Packaging Specification Quantity Packaging Code 12mm Tape and Reel EIA RS-481-2 (IEC 286, part 3) 5000 NR 12mm Tape and Reel EIA RS-481-2 (IEC 286, part 3) 1000 MR Disclaimer Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. 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. 11/05/20