BOURNS MF-USML350-2 Resettable Fuses - PPTC 6V 3.5A-HD 50A MAX
The BOURNS MF-USML350-2 is a high-reliability, resettable polymer PTC fuse designed for circuit protection applications. Manufactured in China, this device offers excellent overcurrent protection with a low resistance profile and robust thermal characteristics. It is RoHS compliant and suitable for various electronic systems requiring reliable overcurrent protection.
Resettable PPTC device providing overcurrent protection for sensitive electronic components
Maximum voltage: 6V
Hold current: 3.50A at 23°C
Trip current: 7.00A at 23°C
Maximum resistance: 0.003Ω at 23°C
Maximum trip time: 17.5 seconds at 23°C
Tripped power dissipation: 0.8W
RoHS compliant and UL certified (UL File Number: E174545)
Suitable for applications such as lithium-ion battery protection, USB port protection, PC motherboards, game consoles, and digital cameras
Electrical Specifications
Model
V max. Volts
I max. Amps
Ihold (A)
Itrip (A)
Resistance (Ω)
Max. Time To Trip (Seconds)
Tripped Power Dissipation (W)
MF-USML350
6
50
3.50
7.00
0.0030
17.50
0.8
Environmental and Mechanical Characteristics
Operating Temperature Range: -40°C to +85°C
Storage Conditions: Max +40°C / 70% RH before opening; Max +40°C / 10% RH after opening
Passive Aging: ±10% resistance change after 1000 hours at +85°C
Humidity Aging: ±15% resistance change after 100 hours at +85% RH
Thermal Shock: ±30% resistance change after 20 cycles between +85°C and -40°C
Vibration and solvent resistance: No change (MIL-STD-202, MIL-STD-883C)
ESD Classification: Class 6 (HBM)
Additional Details
Package: Reel, with 5000 pcs per reel
Suitable for lead-free and tin-lead soldering processes
Designed for thermal protection in various electronic devices including mobile phones, digital cameras, and USB ports
For detailed specifications, testing procedures, and application guidelines, please 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.
Legal Disclaimer: See [disclaimer](https://www.bourns.com/docs/legal/disclaimer.pdf).
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{"id":10019817423165,"title":"MF-USML350-2","handle":"mf-usml350-2","description":"\u003ch3\u003eBOURNS MF-USML350-2 Resettable Fuses - PPTC 6V 3.5A-HD 50A MAX\u003c\/h3\u003e\n\u003cp\u003eThe BOURNS MF-USML350-2 is a high-reliability, resettable polymer PTC fuse designed for circuit protection applications. Manufactured in China, this device offers excellent overcurrent protection with a low resistance profile and robust thermal characteristics. It is RoHS compliant and suitable for various electronic systems requiring reliable overcurrent protection.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e MF-USML350-2\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\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\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eResettable PPTC device providing overcurrent protection for sensitive electronic components\u003c\/li\u003e\n\u003cli\u003eMaximum voltage: 6V\u003c\/li\u003e\n\u003cli\u003eHold current: 3.50A at 23°C\u003c\/li\u003e\n\u003cli\u003eTrip current: 7.00A at 23°C\u003c\/li\u003e\n\u003cli\u003eMaximum resistance: 0.003Ω at 23°C\u003c\/li\u003e\n\u003cli\u003eMaximum trip time: 17.5 seconds at 23°C\u003c\/li\u003e\n\u003cli\u003eTripped power dissipation: 0.8W\u003c\/li\u003e\n\u003cli\u003eRoHS compliant and UL certified (UL File Number: E174545)\u003c\/li\u003e\n\u003cli\u003eSuitable for applications such as lithium-ion battery protection, USB port protection, PC motherboards, game consoles, and digital cameras\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" 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 (Seconds)\u003c\/th\u003e\n\u003cth\u003eTripped Power Dissipation (W)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMF-USML350\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e3.50\u003c\/td\u003e\n\u003ctd\u003e7.00\u003c\/td\u003e\n\u003ctd\u003e0.0030\u003c\/td\u003e\n\u003ctd\u003e17.50\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEnvironmental and Mechanical Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating Temperature Range: -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\u003ePassive Aging: ±10% resistance change after 1000 hours at +85°C\u003c\/li\u003e\n\u003cli\u003eHumidity Aging: ±15% resistance change after 100 hours at +85% RH\u003c\/li\u003e\n\u003cli\u003eThermal Shock: ±30% resistance change after 20 cycles between +85°C and -40°C\u003c\/li\u003e\n\u003cli\u003eVibration and solvent resistance: No change (MIL-STD-202, MIL-STD-883C)\u003c\/li\u003e\n\u003cli\u003eESD Classification: Class 6 (HBM)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAdditional Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePackage: Reel, with 5000 pcs per reel\u003c\/li\u003e\n\u003cli\u003eSuitable for lead-free and tin-lead soldering processes\u003c\/li\u003e\n\u003cli\u003eDesigned for thermal protection in various electronic devices including mobile phones, digital cameras, and USB ports\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor detailed specifications, testing procedures, and application guidelines, please 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\u003e\u003cstrong\u003eLegal Disclaimer:\u003c\/strong\u003e See [disclaimer](https:\/\/www.bourns.com\/docs\/legal\/disclaimer.pdf).\u003c\/p\u003e","published_at":"2025-08-11T17:20:29+05:30","created_at":"2025-08-11T17:20:29+05:30","vendor":"Waldom Electonics","type":"Circuit Protection","tags":["50A","5A","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":50608492478781,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"MF-USML350-2","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"MF-USML350-2","public_title":null,"options":["Default Title"],"price":3465,"weight":250,"compare_at_price":null,"inventory_management":"shopify","barcode":"MF-USML350-2","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/MF-USML350-2_49868050_a0b36de0.jpg?v=1754913032"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/MF-USML350-2_49868050_a0b36de0.jpg?v=1754913032","options":["Title"],"media":[{"alt":null,"id":45783840588093,"position":1,"preview_image":{"aspect_ratio":1.485,"height":200,"width":297,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/MF-USML350-2_49868050_a0b36de0.jpg?v=1754913032"},"aspect_ratio":1.485,"height":200,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/MF-USML350-2_49868050_a0b36de0.jpg?v=1754913032","width":297}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eBOURNS MF-USML350-2 Resettable Fuses - PPTC 6V 3.5A-HD 50A MAX\u003c\/h3\u003e\n\u003cp\u003eThe BOURNS MF-USML350-2 is a high-reliability, resettable polymer PTC fuse designed for circuit protection applications. Manufactured in China, this device offers excellent overcurrent protection with a low resistance profile and robust thermal characteristics. It is RoHS compliant and suitable for various electronic systems requiring reliable overcurrent protection.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e MF-USML350-2\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\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\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eResettable PPTC device providing overcurrent protection for sensitive electronic components\u003c\/li\u003e\n\u003cli\u003eMaximum voltage: 6V\u003c\/li\u003e\n\u003cli\u003eHold current: 3.50A at 23°C\u003c\/li\u003e\n\u003cli\u003eTrip current: 7.00A at 23°C\u003c\/li\u003e\n\u003cli\u003eMaximum resistance: 0.003Ω at 23°C\u003c\/li\u003e\n\u003cli\u003eMaximum trip time: 17.5 seconds at 23°C\u003c\/li\u003e\n\u003cli\u003eTripped power dissipation: 0.8W\u003c\/li\u003e\n\u003cli\u003eRoHS compliant and UL certified (UL File Number: E174545)\u003c\/li\u003e\n\u003cli\u003eSuitable for applications such as lithium-ion battery protection, USB port protection, PC motherboards, game consoles, and digital cameras\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" 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 (Seconds)\u003c\/th\u003e\n\u003cth\u003eTripped Power Dissipation (W)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMF-USML350\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e3.50\u003c\/td\u003e\n\u003ctd\u003e7.00\u003c\/td\u003e\n\u003ctd\u003e0.0030\u003c\/td\u003e\n\u003ctd\u003e17.50\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEnvironmental and Mechanical Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating Temperature Range: -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\u003ePassive Aging: ±10% resistance change after 1000 hours at +85°C\u003c\/li\u003e\n\u003cli\u003eHumidity Aging: ±15% resistance change after 100 hours at +85% RH\u003c\/li\u003e\n\u003cli\u003eThermal Shock: ±30% resistance change after 20 cycles between +85°C and -40°C\u003c\/li\u003e\n\u003cli\u003eVibration and solvent resistance: No change (MIL-STD-202, MIL-STD-883C)\u003c\/li\u003e\n\u003cli\u003eESD Classification: Class 6 (HBM)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAdditional Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePackage: Reel, with 5000 pcs per reel\u003c\/li\u003e\n\u003cli\u003eSuitable for lead-free and tin-lead soldering processes\u003c\/li\u003e\n\u003cli\u003eDesigned for thermal protection in various electronic devices including mobile phones, digital cameras, and USB ports\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor detailed specifications, testing procedures, and application guidelines, please 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\u003e\u003cstrong\u003eLegal Disclaimer:\u003c\/strong\u003e See [disclaimer](https:\/\/www.bourns.com\/docs\/legal\/disclaimer.pdf).\u003c\/p\u003e"}
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.
