SMD150F/33-2

Ptc Resettable Fuses Overview

The Littelfuse SMD150F/33-2 is a surface-mount PolySwitch resettable PPTC device designed for overcurrent protection. It features a hold current of 150 mA and a maximum voltage rating of 33 VDC. The trip current is specified at 300 mA, with a maximum fault current rating of 70 A. The device exhibits a maximum resistance of 1.5 ohms in the tripped state and a nominal resistance of 0.15 ohms. It operates within a temperature range of -40°C to +85°C and is housed in a 1210 (3225 metric) package.

Ptc Resettable Fuses Feature Summary

• Provides automatic resettable overcurrent protection by increasing resistance upon heating during fault conditions
• Designed for surface-mount installation on printed circuit boards to protect sensitive components
• Offers reliable circuit interruption without requiring manual replacement after tripping

Ptc Resettable Fuses Applications

• Protection of portable electronic devices and handheld equipment
• Overcurrent safeguarding for battery-powered consumer electronics
• Circuit protection in telecommunications and networking hardware
• Defense against short circuits in AC-DC power adapters

Ptc Resettable Fuses Procurement Notes

Verify that the specific part number matches the required electrical ratings for your design. Confirm the package dimensions align with your PCB footprint. Ensure the operating temperature range meets your environmental specifications. Check for any recent updates to the datasheet regarding qualification standards or material compliance before finalizing procurement.

Ptc Resettable Fuses Selection Notes

Select this component when a low-profile surface-mount solution is required for moderate current protection. Consider the hold current and trip current ratios to ensure proper sensitivity for your application. Evaluate the maximum voltage rating to guarantee safety under peak circuit conditions. Assess the thermal environment to ensure the device can dissipate heat effectively during normal operation.

Ptc Resettable Fuses Part Context

This device belongs to the PolySwitch resettable fuse family from Littelfuse. These polymer positive temperature coefficient devices are engineered to provide robust circuit protection in compact form factors. The series is widely used in industries requiring reliable, self-resetting overcurrent safeguards for modern electronic assemblies.

Ptc Resettable Fuses Replacement Considerations

Consult official Littelfuse documentation for direct cross-reference equivalents. Verify that any substitute part maintains identical hold current, voltage rating, and package dimensions. Ensure the alternative device meets the same thermal and electrical performance criteria for your specific application.