Bourns Adds Multifuse PPTC Overcurrent Protector Series - 1812 Package Size Rated to 125°C

     Bourns introduces a new family of models in the Multifuse polymer positive temperature coefficient (PPTC) resettable fuse product line. The new Bourns Multifuse MF-MSHT models are high temperature rated, automotive AEC-Q200 qualified and available in standard 1812 surface mount packages. In addition, the MF-MSHT model series has a low thermal derating factor with a maximum voltage range of 9 V – 42 V and a holding current range of 200 mA – 1.75A.

     With the increasing demand for products in the automotive and related industrial and consumer IoT applications, only more powerful overcurrent protection solutions can support high temperature operating environments and provide reliable lifetime performance. The new Multifuse MF-MSHT series designed by Bourns not only provides effective overcurrent protection, but also reduces the risk of unnecessary fusing malfunctions due to product applications requiring high temperatures up to 125°C. New high temperature rated PPTCs provide additional design flexibility, giving designers more options for overcurrent protection solutions to help them best match their application specifications

     "Designers of various automotive applications will find the 125°C rating of the MF-MSHT series a reliable choice for overcurrent protection over a wide range of temperature requirements," said Lee Bourns, product line manager for overcurrent protection at Bourns.

     Bourns' new polymer PTC models are made with a proprietary blend of high-melting polymer materials and carbon-based conductive fillers, enabling high-reliability overcurrent protection performance tailored especially for high temperature environments. The proprietary conductive polymer formulation also increases resistance to common oils, lubricants and solvents that can adversely affect consumer-grade PTCs often used in industrial and transportation applications.

     Bourns added: “The design of the polymer we use in our high-temperature series for severe requirements has advantages because it provides greater protection against penetration by solvents that can cause resistance in many polymers, including PPTC. The resistance of the components drifts, and this increase in resistance may actually make the PPTC need less current to fuse, causing unnecessary fuse failures in the PPTC. Our high-rated temperature MF-MSHT model series can help some severe Designers of environmental systems solve this problem.”