The SMD050F-2 from Bourns is a surface-mount PTC resettable fuse (Polyfuse) with a hold current of 500mA and trip current of 1.0A. It provides overcurrent protection that automatically resets when the fault is removed, in a compact 1206 chip package.<\/p>\n
| Hold Current (IH)<\/td>\n | 500 mA<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||
| Trip Current (IT)<\/td>\n | 1.0 A<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||
| Max Voltage Rating<\/td>\n | 15V DC<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||
| Max Fault Current<\/td>\n | 40 A<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||
| Initial Resistance<\/td>\n | 0.15 Ohm (typical)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||
| Trip Time (5x IH)<\/td>\n | 1.5s (max)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||
| Temperatura de funcionamiento<\/td>\n | -40 to 85 C<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||
| Paquete<\/td>\n | 1206 (3216 metric)<\/td>\n<\/tr>\n<\/table>\nCaracter\u00edsticas<\/h2>\nAplicaciones<\/h2>\nProduct Overview The SMD050F-2 from Bourns is a surface-mount PTC resettable fuse (Polyfuse) with a hold current of 500mA and trip current of 1.0A. It provides overcurrent protection that automatically resets when the fault is removed, in a compact 1206 chip package. Key Specifications Hold Current (IH) 500 mA Trip Current (IT) 1.0 A Max […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[220],"class_list":["post-6273","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-bourns"],"acf":{"brief_explanation":"500mA hold \/ 1A trip PTC resettable fuse, 15V, 1206 SMD, self-resetting","date_code":"","package_case":"1206 (3.2 x 1.6 x 0.8mm)","in_stock":5034,"datasheet":"https:\/\/www.bourns.com\/docs\/product-datasheets\/multifuse-smd.pdf","price":"$0.08 @ 1ku","product_introduction":"The SMD050F-2 from Bourns is a surface-mount PTC (Positive Temperature Coefficient) resettable fuse that provides self-resetting overcurrent protection. With a hold current of 500mA and trip current of 1.0A, it protects circuits from overcurrent faults and automatically resets when the fault condition is removed. The device has low initial resistance (0.15 Ohm typical) and is rated for 15V DC maximum voltage. The compact 1206 chip package enables use in space-constrained applications such as USB ports and battery charger circuits.","working_principle":"The SMD050F-2 operates as a polymer-based PTC resettable fuse using a positive temperature coefficient material. **Normal Operation**: Below the hold current (500mA), the PTC element maintains low resistance (0.15 Ohm typical). Current flows normally with minimal voltage drop and power dissipation. **Overcurrent Trip**: When current exceeds the trip threshold (1.0A), resistive heating (I2R) raises the polymer temperature. At the Curie point, the crystalline polymer transitions to an amorphous state, causing the conductive particles embedded in the polymer to separate dramatically. This increases resistance by several orders of magnitude, effectively limiting the fault current to a small leakage value. **Reset Mechanism**: When the fault is removed and the device cools, the polymer recrystallizes and the conductive particles reconnect, restoring low resistance. This self-resetting behavior eliminates the need to replace fuses after overcurrent events. **Time-Current Characteristic**: The trip time depends on the fault current magnitude. At 5x hold current (2.5A), the device trips within 1.5 seconds maximum, providing fast protection for sensitive circuits.","pin_description":"
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