7446221012

Overview

The Würth Elektronik 7446221012 is a current-compensated common mode choke from the WE-LF series, designed for mains power line filtering. It features a 12 mH inductance measured at 10 kHz and supports a rated current of 1.2 A per line. The component has a maximum DC resistance (DCR) of 280 milliohms and an AC voltage rating of 250 V. It utilizes a vertical through-hole package with four pins, measuring 23.50 mm in length, 16.00 mm in width, and up to 25.50 mm in height. The device operates within a temperature range of -40°C to 125°C.

Feature Summary

• Current-compensated design for effective noise suppression on mains power lines
• Vertical through-hole mounting configuration for standard PCB assembly
• High inductance value optimized for low-frequency common mode interference

Applications

• Mains power line EMI filtering in electronic equipment
• Power supply input stages requiring common mode noise reduction
• Industrial control systems operating under high electromagnetic interference

Procurement Notes

Verify the specific datasheet version when ordering, as manufacturer documentation may undergo corrections or updates over time. Confirm that the vertical through-hole package dimensions align with your PCB footprint requirements. Ensure the 1.2 A current rating meets the operational demands of your circuit to prevent saturation. Check for any recent product change notices regarding material composition or labeling changes.

Selection Notes

Select this component when designing circuits that require robust common mode noise attenuation on AC mains inputs. The 12 mH inductance provides significant impedance to high-frequency noise while maintaining low insertion loss for the differential signal. Consider the 280 mΩ DCR impact on power efficiency if thermal management is critical. The through-hole format offers mechanical stability compared to surface mount alternatives in high-vibration environments.

Part Context

This part belongs to the WE-LF series of common mode chokes specifically engineered for mains power applications. The series emphasizes high performance in suppressing electromagnetic interference generated by switching power supplies and other noisy loads. Würth Elektronik designs these components to meet stringent international safety and environmental standards for consumer and industrial electronics.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.