BOURNS MF-USML250-2 Resettable Fuses - PPTC 6V, 2.50A-HD, 50A MAX
The BOURNS MF-USML250-2 is a high-reliability, resettable polymer PTC fuse designed for circuit protection applications. Manufactured in China, this device offers excellent overcurrent protection with low resistance and fast trip response. It is suitable for use in various electronic devices including battery packs, game consoles, PC motherboards, USB ports, mobile phones, and digital cameras.
Package: Reel with 5,000 pcs. for models MF-USML175 to MF-USML400; 3,500 pcs. for models MF-USML450 to MF-USML700
Soldering: Reflow recommended; wave soldering and hand soldering not advised
Environmental & Testing Standards
Operating Temperature: -40°C to +85°C
Storage Conditions: Max +40°C / 70% RH before opening; Max +40°C / 10% RH after opening
Resistance to Vibration and Thermal Shock: No change per MIL-STD standards
UL File Number: E174545
RoHS Compliance: Yes
Application Areas
Thermal protection for Li-ion and polymer battery packs
Game consoles
PC motherboards
USB port protection - USB 2.0, 3.0 & OTG
Mobile phones
Digital cameras
For detailed specifications and application guidelines, refer to the datasheet. Users should verify device performance in their specific applications. The datasheet was not processed; please search the internet for the part number for more details.
Note: This product complies with RoHS Directive 2015/863. For legal disclaimers, visit Legal Disclaimers.
I'm particularly impressed with how carefully the header pins are packed for the RP2350-PiZero, they arrived in perfect condition without any bent pins, which has been a persistent issue with other competitors. This attention to packaging detail really stands out.
I also received the latest A4 revision of the RP2350, which shows you maintain current inventory, that's really valuable for customers who want the most up to date components.
The delivery was quick and hassle free throughout. I'll definitely be recommending you to others!
App feedback: The discounts offered through the app are a nice bonus, but the component search function could be improved to match the ease of use on the website version. The rest of the app functions work well.
{"id":10019817324861,"title":"MF-USML250-2","handle":"mf-usml250-2","description":"\u003ch3\u003eBOURNS MF-USML250-2 Resettable Fuses - PPTC 6V, 2.50A-HD, 50A MAX\u003c\/h3\u003e\n\u003cp\u003eThe BOURNS MF-USML250-2 is a high-reliability, resettable polymer PTC fuse designed for circuit protection applications. Manufactured in China, this device offers excellent overcurrent protection with low resistance and fast trip response. It is suitable for use in various electronic devices including battery packs, game consoles, PC motherboards, USB ports, mobile phones, and digital cameras.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e MF-USML250-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e BOURNS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e CN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit of Measure:\u003c\/strong\u003e EA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eECCN:\u003c\/strong\u003e EAR99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Type:\u003c\/strong\u003e REEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Circuit Protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Circuit Protection | PPTC Resettable Fuses\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDatasheet:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.waldomapac.com\/productfiles\/mf-bo\/mfusml.pdf\" target=\"_blank\"\u003eMF-USML Series Datasheet\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMaximum Voltage: 6V\u003c\/li\u003e\n\u003cli\u003eHold Current: 2.50A at 23°C\u003c\/li\u003e\n\u003cli\u003eTrip Current: 5.00A at 23°C\u003c\/li\u003e\n\u003cli\u003eMaximum Trip Time: 8 seconds at 23°C\u003c\/li\u003e\n\u003cli\u003eResistance: 0.0045 Ohms (typical at 23°C)\u003c\/li\u003e\n\u003cli\u003eMaximum Power Dissipation: 0.8 Watts\u003c\/li\u003e\n\u003cli\u003eRoHS Compliant\u003c\/li\u003e\n\u003cli\u003eEnvironmental Operating Temperature: -40°C to +85°C\u003c\/li\u003e\n\u003cli\u003ePassive Aging Resistance Change: ±10% after 1000 hours at 85°C\u003c\/li\u003e\n\u003cli\u003eHumidity Aging Resistance Change: ±15% after 100 hours at 85% R.H.\u003c\/li\u003e\n\u003cli\u003eVibration and Thermal Shock Resistance: No change according to MIL-STD standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"4\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eV max. Volts\u003c\/th\u003e\n\u003cth\u003eI max. Amps\u003c\/th\u003e\n\u003cth\u003eIhold (A)\u003c\/th\u003e\n\u003cth\u003eItrip (A)\u003c\/th\u003e\n\u003cth\u003eResistance (Ω)\u003c\/th\u003e\n\u003cth\u003eMax. Time To Trip (sec)\u003c\/th\u003e\n\u003cth\u003eTripped Power Dissipation (W)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMF-USML250\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2.50\u003c\/td\u003e\n\u003ctd\u003e5.00\u003c\/td\u003e\n\u003ctd\u003e0.0045\u003c\/td\u003e\n\u003ctd\u003e8.00\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003ePhysical and Mechanical Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions (in inches): Length 3.00 - 3.43, Width 2.35 - 2.80, Height 0.30 - 0.60\u003c\/li\u003e\n\u003cli\u003eTerminal Material: ENIG-plated terminals\u003c\/li\u003e\n\u003cli\u003ePackage: Reel with 5,000 pcs. for models MF-USML175 to MF-USML400; 3,500 pcs. for models MF-USML450 to MF-USML700\u003c\/li\u003e\n\u003cli\u003eSoldering: Reflow recommended; wave soldering and hand soldering not advised\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEnvironmental \u0026amp; Testing Standards\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating Temperature: -40°C to +85°C\u003c\/li\u003e\n\u003cli\u003eStorage Conditions: Max +40°C \/ 70% RH before opening; Max +40°C \/ 10% RH after opening\u003c\/li\u003e\n\u003cli\u003eResistance to Vibration and Thermal Shock: No change per MIL-STD standards\u003c\/li\u003e\n\u003cli\u003eUL File Number: E174545\u003c\/li\u003e\n\u003cli\u003eRoHS Compliance: Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplication Areas\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThermal protection for Li-ion and polymer battery packs\u003c\/li\u003e\n\u003cli\u003eGame consoles\u003c\/li\u003e\n\u003cli\u003ePC motherboards\u003c\/li\u003e\n\u003cli\u003eUSB port protection - USB 2.0, 3.0 \u0026amp; OTG\u003c\/li\u003e\n\u003cli\u003eMobile phones\u003c\/li\u003e\n\u003cli\u003eDigital cameras\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor detailed specifications and application guidelines, refer to the \u003ca href=\"https:\/\/www.waldomapac.com\/productfiles\/mf-bo\/mfusml.pdf\" target=\"_blank\"\u003edatasheet\u003c\/a\u003e. Users should verify device performance in their specific applications. The datasheet was not processed; please search the internet for the part number for more details.\u003c\/p\u003e\n\u003cp\u003eNote: This product complies with RoHS Directive 2015\/863. For legal disclaimers, visit \u003ca href=\"http:\/\/www.bourns.com\/docs\/legal\/disclaimer.pdf\" target=\"_blank\"\u003eLegal Disclaimers\u003c\/a\u003e.\u003c\/p\u003e","published_at":"2025-08-11T17:20:21+05:30","created_at":"2025-08-11T17:20:21+05:30","vendor":"Waldom Electonics","type":"Circuit Protection","tags":["50A","6V","BOURN","Circuit","IMPORT_CSV","PPTC","WLDM"],"price":3465,"price_min":3465,"price_max":3465,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":50608492380477,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"MF-USML250-2","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"MF-USML250-2","public_title":null,"options":["Default Title"],"price":3465,"weight":250,"compare_at_price":null,"inventory_management":"shopify","barcode":"MF-USML250-2","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/MF-USML250-2_49868047_d00c1229.jpg?v=1754913025"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/MF-USML250-2_49868047_d00c1229.jpg?v=1754913025","options":["Title"],"media":[{"alt":null,"id":45783839506749,"position":1,"preview_image":{"aspect_ratio":1.485,"height":200,"width":297,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/MF-USML250-2_49868047_d00c1229.jpg?v=1754913025"},"aspect_ratio":1.485,"height":200,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/MF-USML250-2_49868047_d00c1229.jpg?v=1754913025","width":297}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eBOURNS MF-USML250-2 Resettable Fuses - PPTC 6V, 2.50A-HD, 50A MAX\u003c\/h3\u003e\n\u003cp\u003eThe BOURNS MF-USML250-2 is a high-reliability, resettable polymer PTC fuse designed for circuit protection applications. Manufactured in China, this device offers excellent overcurrent protection with low resistance and fast trip response. It is suitable for use in various electronic devices including battery packs, game consoles, PC motherboards, USB ports, mobile phones, and digital cameras.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e MF-USML250-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e BOURNS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e CN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit of Measure:\u003c\/strong\u003e EA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eECCN:\u003c\/strong\u003e EAR99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Type:\u003c\/strong\u003e REEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Circuit Protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Circuit Protection | PPTC Resettable Fuses\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDatasheet:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.waldomapac.com\/productfiles\/mf-bo\/mfusml.pdf\" target=\"_blank\"\u003eMF-USML Series Datasheet\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMaximum Voltage: 6V\u003c\/li\u003e\n\u003cli\u003eHold Current: 2.50A at 23°C\u003c\/li\u003e\n\u003cli\u003eTrip Current: 5.00A at 23°C\u003c\/li\u003e\n\u003cli\u003eMaximum Trip Time: 8 seconds at 23°C\u003c\/li\u003e\n\u003cli\u003eResistance: 0.0045 Ohms (typical at 23°C)\u003c\/li\u003e\n\u003cli\u003eMaximum Power Dissipation: 0.8 Watts\u003c\/li\u003e\n\u003cli\u003eRoHS Compliant\u003c\/li\u003e\n\u003cli\u003eEnvironmental Operating Temperature: -40°C to +85°C\u003c\/li\u003e\n\u003cli\u003ePassive Aging Resistance Change: ±10% after 1000 hours at 85°C\u003c\/li\u003e\n\u003cli\u003eHumidity Aging Resistance Change: ±15% after 100 hours at 85% R.H.\u003c\/li\u003e\n\u003cli\u003eVibration and Thermal Shock Resistance: No change according to MIL-STD standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"4\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eV max. Volts\u003c\/th\u003e\n\u003cth\u003eI max. Amps\u003c\/th\u003e\n\u003cth\u003eIhold (A)\u003c\/th\u003e\n\u003cth\u003eItrip (A)\u003c\/th\u003e\n\u003cth\u003eResistance (Ω)\u003c\/th\u003e\n\u003cth\u003eMax. Time To Trip (sec)\u003c\/th\u003e\n\u003cth\u003eTripped Power Dissipation (W)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMF-USML250\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2.50\u003c\/td\u003e\n\u003ctd\u003e5.00\u003c\/td\u003e\n\u003ctd\u003e0.0045\u003c\/td\u003e\n\u003ctd\u003e8.00\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003ePhysical and Mechanical Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions (in inches): Length 3.00 - 3.43, Width 2.35 - 2.80, Height 0.30 - 0.60\u003c\/li\u003e\n\u003cli\u003eTerminal Material: ENIG-plated terminals\u003c\/li\u003e\n\u003cli\u003ePackage: Reel with 5,000 pcs. for models MF-USML175 to MF-USML400; 3,500 pcs. for models MF-USML450 to MF-USML700\u003c\/li\u003e\n\u003cli\u003eSoldering: Reflow recommended; wave soldering and hand soldering not advised\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEnvironmental \u0026amp; Testing Standards\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating Temperature: -40°C to +85°C\u003c\/li\u003e\n\u003cli\u003eStorage Conditions: Max +40°C \/ 70% RH before opening; Max +40°C \/ 10% RH after opening\u003c\/li\u003e\n\u003cli\u003eResistance to Vibration and Thermal Shock: No change per MIL-STD standards\u003c\/li\u003e\n\u003cli\u003eUL File Number: E174545\u003c\/li\u003e\n\u003cli\u003eRoHS Compliance: Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplication Areas\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThermal protection for Li-ion and polymer battery packs\u003c\/li\u003e\n\u003cli\u003eGame consoles\u003c\/li\u003e\n\u003cli\u003ePC motherboards\u003c\/li\u003e\n\u003cli\u003eUSB port protection - USB 2.0, 3.0 \u0026amp; OTG\u003c\/li\u003e\n\u003cli\u003eMobile phones\u003c\/li\u003e\n\u003cli\u003eDigital cameras\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor detailed specifications and application guidelines, refer to the \u003ca href=\"https:\/\/www.waldomapac.com\/productfiles\/mf-bo\/mfusml.pdf\" target=\"_blank\"\u003edatasheet\u003c\/a\u003e. Users should verify device performance in their specific applications. The datasheet was not processed; please search the internet for the part number for more details.\u003c\/p\u003e\n\u003cp\u003eNote: This product complies with RoHS Directive 2015\/863. For legal disclaimers, visit \u003ca href=\"http:\/\/www.bourns.com\/docs\/legal\/disclaimer.pdf\" target=\"_blank\"\u003eLegal Disclaimers\u003c\/a\u003e.\u003c\/p\u003e"}
