BK250-040-DY

Ptc Resettable Fuses Overview

The YAGEO BK250-040-DY is a polymer PTC self-resettable fuse from the BK250 series, designed for through-hole PCB mounting. It features a radial disc package with a 5.1 mm lead spacing. Key electrical parameters include a maximum voltage of 250 V, a hold current (Ih) of 40 mA, and a trip current (It) of 80 mA. The device has a maximum rated current of 3 A, an initial resistance of 27 Ohms, and a post-trip resistance of up to 65 Ohms. It operates within a temperature range of -40°C to +85°C.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit protection by increasing resistance significantly upon overcurrent conditions.
• Self-restores functionality once the fault condition is removed and the device cools down.
• Utilizes polymer technology for reliable performance in low-current applications.

Ptc Resettable Fuses Applications

• Overcurrent protection for portable electronic devices
• Protection circuits for communication equipment
• Circuit safeguarding in consumer electronics

Ptc Resettable Fuses Procurement Notes

Verify component authenticity against official YAGEO documentation. Confirm that the specific part number matches the required electrical specifications, particularly the 40 mA hold current and 250 V rating. Ensure compliance with RoHS directives as indicated in the datasheet. Cross-reference the BK250 series characteristics to validate suitability for the intended thermal and electrical environment.

Ptc Resettable Fuses Selection Notes

Select this component for applications requiring precise low-current protection with a 40 mA hold threshold. The 250 V maximum voltage rating suits standard low-voltage circuits. Consider the radial disc form factor for through-hole assembly constraints. Evaluate the 27 Ohm initial resistance impact on circuit operation. Verify that the 3 A maximum current rating accommodates potential surge currents without nuisance tripping.

Ptc Resettable Fuses Part Context

This component belongs to the YAGEO BK250 series of resettable fuses. The series offers various hold current options and package styles, including disc and square forms. The BK250-040-DY specifically represents the 40 mA variant in the radial disc configuration, providing a compact solution for protecting sensitive low-power components against accidental overcurrent events.

Ptc Resettable Fuses Replacement Considerations

Compatible substitutes within the BK250 series include other variants with similar voltage ratings but different hold currents, such as BK250-030-DZ or BK250-050-DY. Verify that any replacement maintains the 250 V maximum voltage and compatible package dimensions for direct PCB integration.

Ptc Resettable Fuses FAQ

What is the typical trip time for the BK250-040-DY?

The typical trip time is approximately 6 seconds when subjected to the specified trip current.

Does the BK250-040-DY have UL certification?

Yes, the component holds UL certification for safety standards compliance.