Bourns has announced the MF-ASMF Series Multifuse polymer positive temperature coefficient (PPTC) resettable fuses for overcurrent protection in portable electronics with limited PCB area. The series includes three models with hold-current ratings of 0.05 A, 0.08 A, and 0.10 A in a 0402 footprint. Maximum voltage ratings are 6 VDC or 9 VDC.
The devices target battery-powered and portable electronic designs that require protection for low-current battery, charging, sensing, signal-line, and interface circuits while maintaining compact board dimensions. The MF-ASMF Series uses a symmetrical package measuring up to 1.15 mm by 0.65 mm with a maximum profile of 0.6 mm. The fuses feature time-to-trip characteristics within the specified limits for each model, electroless nickel under immersion gold (ENIG) terminals, cUL recognition, and TÜV certification.
“Designers of compact, battery-powered electronics need low-hold-current protection that does not increase the required board area. The MF-ASMF Series provides three hold-current options in a 0402 footprint, with a symmetrical 0.6 mm maximum profile and ENIG terminals for surface-mount assembly,” said Shawn Yu, Product Line Manager, Bourns.
Design Features
- Compact 0402 footprint for space-constrained portable electronics.
- Time-to-trip response within the limits specified for each model.
- ENIG terminals (electroless nickel under immersion gold) for solderability.
- Symmetrical low-profile design with a maximum component profile of 0.6 mm.
- Agency recognition: cUL recognized under file E174545 and TÜV certified under R50256634.
- TÜV certifications cover IEC 62319-1, IEC 60738-1, and IEC 60730-1:2013, including Clause 15, Clause 17, and Annex J.
- RoHS compliant and halogen free.
Target Applications
- Overcurrent protection for small Li-ion and polymer battery circuits in wearable devices
- I/O and signal line protection in PC motherboards
- Protection for low-power battery and charging circuits in mobile devices
- Sensing circuit protection
- Interface protection for handheld and portable gaming devices
- Protection for electronic reading devices, digital cameras, and other portable electronics
The MF-ASMF Series Multifuse PPTC Resettable Fuses are available through Bourns’ authorized distribution network. Specifications and inventory information are available at bourns.com/products/circuit-protection/resettable-fuses-multifuse-pptc#smdlos. Samples may be requested from Bourns Customer Service.
