Features Additional Information n Surface mount packaging for automated Click these links for more information: assembly n Small footprint size (1210) and low profile for space-constrained mobile applications n Ultra-low resistance, quick response PRODUCT TECHNICAL INVENTORY SAMPLES CONTACT SELECTOR LIBRARY n RoHS compliant* n Agency recognition: MF-USML/X Series - Low Ohmic PTC Resettable Fuses Electrical Characteristics Tripped I I Resistance Max. Time To Trip Power Agency Recognition hold trip Dissipation V I max max Model Watts at at 23 C at 23 C Ohms at 23 C cUL TV 23 C Typ. Volts Amps Amps R R Amps Seconds E174545 R50391579 min 1max MF-USML175/6 6 50 1.75 3.5 0.006 0.05 8 0.8 1.0 3 3 MF-USML175/12 12 50 1.75 3.5 0.006 0.05 8 0.8 1.0 3 3 MF-USML200/6 6 50 2.0 4.0 0.005 0.04 8 5 1.0 3 3 MF-USML200/12 12 50 2.0 4.0 0.005 0.04 8 5 1.0 3 3 MF-USML260/6 6 50 2.6 5.2 0.004 0.03 8 5 1.0 3 3 MF-USML260/12 12 50 2.6 5.2 0.004 0.03 8 5 1.0 3 3 MF-USML300/6 6 50 3.0 6.0 0.003 0.024 15 5 1.0 3 3 MF-USML300/12 12 50 3.0 6.0 0.003 0.024 15 5 1.0 3 3 MF-USML350/6 6 50 3.5 7.0 0.002 0.022 17 5 1.0 3 3 MF-USML350/12 12 50 3.5 7.0 0.002 0.022 17 5 1.0 3 3 MF-USML380/6 6 50 3.8 7.6 0.002 0.02 19 5 1.0 3 3 MF-USML380/12 12 50 3.8 7.6 0.002 0.02 19 5 1.0 3 3 MF-USML400/6 6 50 4.0 8.0 0.002 0.018 20 5 1.0 3 3 MF-USML400/12 12 50 4.0 8.0 0.002 0.018 20 5 1.0 3 3 MF-USML450/6 6 50 4.5 9.0 0.002 0.014 22.5 2 1.0 3 3 MF-USML450/12 12 50 4.5 9.0 0.002 0.014 22.5 2 1.0 3 3 MF-USML500/6 6 50 5.0 10 0.001 0.012 25 2 1.2 3 3 MF-USML500/12 12 50 5.0 10 0.001 0.012 25 2 1.2 3 3 MF-USML550/6 6 50 5.5 11 0.001 0.01 27.5 2 1.2 3 3 MF-USML550/12 12 50 5.5 11 0.001 0.01 27.5 2 1.2 3 3 MF-USML600/6 6 50 6.0 12 0.001 0.01 30 2 1.2 3 3 MF-USML650/6 6 50 6.5 13 0.001 0.009 32.5 2 1.2 3 3 MF-USML700/6 6 50 7.0 14 0.001 0.008 35 2 1.2 3 3 Environmental Characteristics Item Condition Criteria Operating Temperature -40 C to +85 C Before Opening +40 C max. / 70 % RH max. Storage Condition After Opening +40 C max. / 10 % RH max. Consumption within 4 weeks at floor condition Floor Condition After Opening +30 C max. / 60 % RH max. Passive Aging +85 C, 1000 hours 10 % typical resistance change Humidity Aging +85 C, 85 % R.H. 100 hours 15 % typical resistance change Thermal Shock -40 C to +85 C, 20 times 30 % typical resistance change Solvent Resistance MIL-STD-202, Method 215 No change (marking still legible) Vibration MIL-STD-883C, Method 2007.1 Condition A No change (R < R < R ) min 1max Moisture Sensitivity Level (MSL) See Note ESD Classication Class 6 (per AEC-Q200-2, HBM) Specifications are subject to change without notice. Users * RoHS Directive 2015/863, Mar 31, 2015 and Annex. should verify actual device performance in their specific ** Bourns considers a product to be halogen free if (a) the applications. The products described herein and this WARNING Bromine (Br) content is 900 ppm or less (b) the Chlorine document are subject to specific legal disclaimers as set Cancer and Reproductive Harm (Cl) content is 900 ppm or less and (c) the total Bromine forth on the last page of this document, and at www.P65Warnings.ca.gov (Br) and Chlorine (Cl) content is 1500 ppm or less. www.bourns.com/docs/legal/disclaimer.pdf. *RoHS COMPLIANT & **HALOGEN FREE *RoHS COMPLIANT LEAD FREE LEAD FREE VERSIONS ARE RoHS COMPLIANT*MF-USML/X Series - Low Ohmic PTC Resettable Fuses Test Procedures and Requirements Item Test Condition Accept/Reject Criteria Visual/Mechanical Verify dimensions and materials Per MF physical description Resistance In still air 23 C R R R min max Time to Trip At specified current, V , 23 C, still air T max. time to trip (seconds) max Hold Current 30 min. at I , still air No trip hold Trip Cycle Life V , I , 100 cycles No arcing or burning max max Trip Endurance V , 48 hours No arcing or burning max Solderability 245 C 5 C, 5 seconds 95 % min. coverage Product Dimensions A B C D E Model Min. Max. Min. Max. Min. Max. Min. Min. Max. MF-USML175/6 MF-USML175/12 MF-USML200/6 3.0 3.43 2.35 2.8 0.4 0.70 MF-USML200/12 (.118) (.135) (.093) (.110) (.016) (.028) MF-USML260/6 MF-USML260/12 MF-USML300/6 MF-USML300/12 MF-USML350/6 MF-USML350/12 MF-USML380/6 0.25 0.05 0.45 MF-USML380/12 (.010) (.002) (.018) MF-USML400/6 3.0 3.43 2.35 2.8 0.6 1.2 (.118) (.135) (.093) (.110) (.024) (.047) MF-USML400/12 MF-USML450/6 MF-USML450/12 MF-USML500/6 MF-USML500/12 MF-USML550/6 MF-USML550/12 MF-USML600/6 3.0 3.43 2.35 2.8 0.6 0.95 MF-USML650/6 (.118) (.135) (.093) (.110) (.024) (.037) MF-USML700/6 MM DIMENSIONS: (INCHES) Recommended Pad Layout Top View Side View Bottom View Terminal material: ENIG-plated terminals A C D E 1.0 1.0 (.039) (.039) B 2.5 (.098) 2.0 (.079) Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.