749251050

Current Sense Transformers Overview

The Würth Elektronik 749251050 is a board-mount current sense transformer from the WE-CST series. It features an inductance of 500 µH and supports a primary current rating of 20 A with a 1:50 turns ratio. The device has a primary DC resistance of 6 mΩ and a secondary DC resistance of 1.4 Ω. Designed for surface mount technology, it measures 7.7 mm in length, 6.9 mm in width, and 5.33 mm in height. It operates within a temperature range of -40°C to +125°C.

Current Sense Transformers Feature Summary

• Provides galvanic isolation between primary and secondary circuits for accurate current monitoring
• Utilizes a compact surface mount package suitable for automated PCB assembly processes
• Offers high primary current handling capability with low insertion loss characteristics

Current Sense Transformers Applications

• Current sensing in AC-DC and DC-DC power supply converters
• Overcurrent protection circuits in industrial equipment
• Isolated feedback loops in offline switch-mode power supplies

Current Sense Transformers Procurement Notes

Verify the specific manufacturer part number against official Wurth Elektronik documentation to ensure authenticity. Confirm that the component meets required RoHS compliance standards for your region. Check for any recent Product Change Notifications (PCN) regarding design or material updates before finalizing procurement plans.

Current Sense Transformers Selection Notes

Select this component when a 1:50 turns ratio and 20 A primary current rating are required. Ensure the PCB layout accommodates the specified 7.7 mm x 6.9 mm footprint. Verify that the operating environment stays within the -40°C to +125°C temperature range for reliable performance.

Current Sense Transformers Part Context

This component belongs to the WE-CST series of current sense transformers manufactured by Würth Elektronik. These devices are designed for non-invasive current measurement in switching power applications. The series provides various ratios and current ratings to suit different power management requirements.

Current Sense Transformers Replacement Considerations

Consult official Wurth Elektronik documentation for verified substitute part numbers within the WE-CST family. Ensure any replacement matches the 1:50 ratio, 500 µH inductance, and physical dimensions.