749251040

Current Sense Transformers Overview

The Würth Elektronik 749251040 is a WE-CST series current sense transformer designed for board mounting. It features a 1:40 turns ratio and operates as an intrusive type with SMD termination. Key electrical parameters include a primary DC resistance of 0.75 mΩ, secondary DC resistance of 30 Ω, and an inductance of 980 µH. The component supports a maximum primary current of 10 A and has an ET value of 35 Vµs. Physical dimensions are 7.70 mm in length, 6.90 mm in width, and 5.33 mm in height.

Current Sense Transformers Feature Summary

• Provides precise current sensing through a fixed 1:40 turns ratio.
• Features low primary DC resistance to minimize insertion loss.
• Designed for surface mount assembly on printed circuit boards.
• Includes shielding to reduce electromagnetic interference.

Current Sense Transformers Applications

• Current monitoring in AC/DC power supplies
• Overcurrent protection circuits
• Battery management systems

Current Sense Transformers Procurement Notes

Verify the specific datasheet version when ordering, as Product Change Notices (PCN) may affect physical dimensions or internal materials. Confirm that the 1:40 ratio matches the system design requirements. Check for RoHS compliance status on the official manufacturer documentation prior to final procurement approval.

Current Sense Transformers Selection Notes

Select this component when a high-precision current measurement is required in space-constrained designs. The 1:40 ratio offers a balance between signal amplitude and bandwidth. Ensure the PCB layout accommodates the 7.70 x 6.90 mm footprint and 5.33 mm height. Consider the 10 A primary current limit when sizing for peak load conditions.

Current Sense Transformers Part Context

This part belongs to the WE-CST series of current sense transformers from Würth Elektronik. These components are engineered for efficient current monitoring in switching power applications. The series provides various turns ratios to suit different voltage and current levels while maintaining compact form factors suitable for modern electronics manufacturing.

Current Sense Transformers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires matching the 1:40 ratio, 980 µH inductance, and 7.70 x 6.90 mm package dimensions with other manufacturers' current sense transformers.