451 Series - NANO Fast-Acting Subminiature Surface Mount Fuse

451_Series
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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. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The Nano SMF Fuse is a very small, Wire-in-Air (WIA) square shape surface mount fuse which is very suitable for the secondary side circuit over-current protection applications and is designed for PCB using surface mount technology.

Features:

  • Very fast acting
  • Small size
  • Wide range of current rating available (0.062A to 20A)
  • Wide operating temperature range
  • Low temperature rerating
  • RoHS compliant and Halogen Free

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

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VDC (V)VAC (V)Nominal Melting I2T (A2sec)Resistance
(Ω)
Interrupting RatingBodyMin Operating Temp (°C)Max Operating Temp (°C)Marking CodeMSLOpeningSizeStockSamplesCompare
04510202065651540.00244400A@32VDCCeramic-5512520A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.0620.0621251250.000195.5300A@32VDCCeramic-5512562mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.0800.081251250.000334.05300A@32VDCCeramic-5512580mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.1000.11251250.001383.1300A@32VDCCeramic-55125100mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.1250.1251251250.002861.7300A@32VDCCeramic-55125125mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.1600.161251250.00481.2157300A@32VDCCeramic-55125160mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.2000.21251250.00890.8372300A@32VDCCeramic-55125200mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.2500.251251250.01580.5765300A@32VDCCeramic-55125250mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.3150.3151251250.03110.3918300A@32VDCCeramic-55125315mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.3750.3751251250.04420.4541300A@32VDCCeramic-55125375mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.4000.41251250.05510.4233300A@32VDCCeramic-55125400mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.5000.51251250.08240.3046300A@32VDCCeramic-55125500mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.6300.631251250.13810.2022300A@32VDCCeramic-55125630mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.7500.751251250.21430.1444300A@32VDCCeramic-55125750mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451.8000.81251250.26540.1355300A@32VDCCeramic-55125800mA LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451001.11251250.60290.078300A@32VDCCeramic-551251A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451002.21251250.530.0367300A@32VDCCeramic-551252A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451003.31251251.650.0227300A@32VDCCeramic-551253A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451004.41251253.1520.016300A@32VDCCeramic-551254A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451005.51251255.5660.0125300A@32VDCCeramic-551255A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451007.712512510.320.009400A@32VDCCeramic-551257A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451008.812512520.230.0077400A@32VDCCeramic-551258A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
045101.51.51251250.8530.063300A@32VDCCeramic-551251.5A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
045101.61.61251251.060.058300A@32VDCCeramic-551251.6A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451010.1012512526.460.0056400A@32VDCCeramic-5512510A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451012.12656547.970.0049400A@32VDCCeramic-5512512A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
0451015.15656597.820.0037400A@32VDCCeramic-5512515A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
045102.52.51251251.0290.0286300A@32VDCCeramic-551252.5A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
045103.53.51251252.4690.02300A@32VDCCeramic-551253.5A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
045106.36.31251259.170.0096400A@32VDCCeramic-551256.3A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
04511.251.251251250.6640.078300A@32VDCCeramic-551251.25A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder
04513.153.151251251.920.0215300A@32VDCCeramic-551253.15A LF1Very Fast-Acting (FF)6.10 x 2.69mmCheckOrder

EC611 Circuit Protection for Lithium Ion and Lithium Polymer Rechargeable Battery Applications

This application note summarizes how the increased use of Lithium-Ion and Lithium Polymer battery packs in applications where user safety is critical, the implementation of secondary protection circuits will ensure an unsurpassed level of safety with minimal cost impact.

451 Series Time Curve Data

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