453

451_V01 LITTELFUSE

Document overview

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Technical content

© 2025 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/01/25 451/453 Series Very Fast-Acting Fuse

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. Agency Approvals Agency Agency File Number Ampere Range E10480 6.3A - 20A 29862 0.062A - 15A J50446731 3.15A, 4A, 5A, 7A, 8A, 10A, 12A, 20A PS E NBK030205-E10480A NBK030205-E10480B NBK101105-E184655 1A-1 .6A 2A-5A 6.3A - 10A E10480 0.062A - 5A NA 0.062A - 20A NA 0.062A - 20A Electrical Characteristics for Series Features & Benefits ■ Very fast-acting ■ Small size ■ Wide range of current rating available (0.062A to 20A) ■ Wide operating temperature range ■ RoHS compliant and Halogen Free ■ UL Listed and Recognized to UL/CSA/NMX UL 248-1 and UL/CSA/NMX UL 248-14 (see Agency Approvals) ■ Conforms to DENAN’s Appendix 3 ■ Conforms to IEC/EN 60127-1 and IEC/EN 60127-7 % of Ampere Rating Ampere Rating Opening Time 100% 0.062 – 20 4 hours, Minimum 200% 0.062 – 10 5 sec., Maximum 12 – 20 20 sec., Maximum RoHS PS E

Applications

■ Notebook PC ■ LCD/PDP TV ■ LCD monitor ■ LCD/PDP panel ■ LCD backlight inverter ■ Portable DVD player ■ Power supply ■ Networking ■ PC server ■ Cooling fan system ■ Storage system ■ Telecom system ■ Wireless basestation ■ White goods ■ Game console ■ Office Automation equipment ■ Battery charging circuit protection ■ Industrial equipment Resources

451 Series

453 Series

© 2025 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/01/25 451/453 Series Very Fast-Acting Fuse Electrical Specifications by Item Ampere Rating (A) Amp Code Max Voltage Rating (V) Interrupting Rating Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2sec) Agency Approvals PS E .062 .062 125 50A @125VAC/VDC 300A @32VDC PSE: 100A @100VAC 5.5000 0.00019 - x - x - x x .080 .080 125 4.0500 0.00033 - x - x - x x .100 .100 125 3.1000 0.00138 - x - x - x x .125 .125 125 1 .7000 0.00286 - x - x - x x .160 .160 125 1 .2157 0.0048 - x - x - x x .200 .200 125 0.8372 0.0089 - x - x - x x .250 .250 125 0.5765 0.0158 - x - x - x x .315 .315 125 0.3918 0.0311 - x - x - x x .375 .375 125 0.4541 0.0442 - x - x - x x .400 .400 125 0.4233 0.0551 - x - x - x x .500 .500 125 0.3046 0.0824 - x - x - x x .630 .630 125 0.2022 0.1381 - x - x - x x .750 .750 125 0.1444 0.2143 - x - x - x x .800 .800 125 0.1355 0.2654 - x - x - x x 1. 0 0 0 01. 125 0.0780 0.6029 - x x x x x x 1 .25 1 .25 125 0.0780 0.664 - x x x x x x 1 .50 01. 5 125 0.0630 0.853 - x x x - x x 1 .60 01. 6 125 0.0580 1 .060 - x x x - x x 2.00 002. 125 50A @125VAC/VDC 10,000A @75VDC 300A @32VDC PSE: 100A @100VAC 0.0367 0.530 - x x x x x x 2.50 02.5 125 0.0286 1 .029 - x x x x x x 3.00 003. 125 0.0227 1 .650 - x x x - x x 3.15 3.15 125 0.0215 1 .920 - x x x x x x 3.50 03.5 125 0.0200 2.469 - x x x - x x 4.00 004. 125 0.0160 3.152 - x x x x x x 5.00 005. 125 0.0125 5.566 - x x x x x x 6.30 06.3 125 50A @125VAC/VDC 400A @32VDC PSE: 100A @100VAC 0.0096 9.170 x x x - - x x 7. 0 0 0 0 7. 125 0.0090 10.32 x x x - x x x 8.00 008. 125 0.0077 20.23 x x x - x x x 10.0 010. 125 35A @125 VAC/ 50A @125 VDC 400A @32 VDC PSE: 100A @100VAC 0.0056 26.46 x x x - x x x 12.0 012. 65 150A @65VDC 100A @65VAC 400A @32VDC 0.0049 47 .97 x x - - x x x 15.0 015. 65 0.0037 97 .82 x x - - - x x 20.0 020. 65 0.00244 154 x - - - x x x Notes: - l2t calculated at 8ms. - Resistance is measured at 10% of rated current, 25ºC

© 2025 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/01/25 451/453 Series Very Fast-Acting Fuse 0.001 0.01 0.1 100 0.01 0.1 1 10 100 1000 10000 TIME IN SECONDS CURRENT IN AMPS Fast Acting Series TC Curve 10A 12A 6.3A 15A 3.5A 3.15A 2.5A 1.5A 1.25A 800mA 750mA 630mA 500mA 375mA 400mA 315mA 250mA 200mA 100mA 125mA 160mA 80mA 62mA 1.6A 20A Average Time Current Curves Reflow Condition Pb – Free assembly Pre Heat - T emperature Min (Ts(min)) 150°C - T emperature Max (Ts(max)) 200°C - Time (Min to Max) (ts) 60 – 180 secs Average ramp up rate (Liquidus T emp (TL) to peak 5°C/second max. TS(max) to TL - Ramp-up Rate 5°C/second max. Reflow - T emperature (TL) (Liquidus) 217°C - T emperature (tL) 60 – 150 seconds Peak T emperature (TP) 260+0/–5 °C Time within 5°C of actual peak T emperature (tp) 20 – 40 seconds Ramp-down Rate 5°C/second max. Time 25°C to peak T emperature (TP) 8 minutes max. Do not exceed 260°C Soldering Parameters T emperature Re-rating Curve Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. Wave Soldering Parameters 260°C Peak Temperature, 10 seconds max. Time Temperature TP TL TS(max) TS(min) tP tL tS time to peak temperature (t 25ºC to peak) Ramp-down Ramp-up Preheat Critical Zone TL to TP

© 2025 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/01/25 451/453 Series Very Fast-Acting Fuse Materials Body: Ceramic T erminations: Gold-Plated Caps / Sn-dipped Silver Plated Caps (451 RoHS/HF series) Silver-plated Caps (451MR RoHS ratings below 375mA and 453 RoHS Series) Product Marking Brand, Ampere Rating Operating T emperature –55°C to 125°C Moisture Sensitivity Level Level 1, J-STD-020 Solderability MIL -STD-202, Method 208 Insulation Resistance (after Opening) MIL -STD-202, Method 302, Test Condition A (10,000 ohms minimum) Thermal Shock MIL -STD-202, Method 107 , Test Condition B, 5 cycles, -65°C / +125°C, 15 minutes @ each extreme Mechanical Shock MIL -STD-202, Method 213, Test I: Deenergized. 100G’s pk amplitude, sawtooth wave 6ms duration, 3 cycles XYZ+xyz = 18 shocks Vibration MIL -STD-202, Method 201: 0.03” amplitude, 10-55 Hz in 1 min. 2hrs each XYZ=6hrs Moisture Resistance MIL -STD-202, Method 106, 10 cycles Salt Spray MIL -STD-202, Method 101, Test Condition B (48hrs) Resistance to Soldering Heat MIL -STD-202, Method 210, Test condition B (10 sec at 260°C) Product Characteristics Dimensions mm (inches) Packaging Part Numbering System 6.86 (.270") 3.15 (.124") 2.95 (.116")1.96 (.077") 2.69 ± .25 (.106") 2.69 ± .25 (.106") 1.45 (.057") 6.10 ± .20 (.240") Recommended pad layout F 7 A Packaging Option Packaging Specification Quantity 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 0451 001. M R L Series Amp Code Quantity code Packaging code Refer to Electrical characteristics table M = 1000 pcs N = 5000 pcs R = Tape and Reel L-RoHS Compliant & Halogen Free (Gold Plated Caps) 451 = Gold / Sn-dipped Silver Plated Caps 453 = Silver Plated 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. SN-RoHS Compliant & Halogen Free (Sn-dipped Caps) 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