749252125

Current Sense Transformers Overview

The Würth Elektronik 749252125 is a surface-mount current sensing transformer designed for board-level applications. It features a 1:125 turns ratio and an inductance of 1.28 mH. The device supports a maximum primary current of 7 A with a secondary DC resistance of 13 ohms and a primary resistance of 3 milliohms. It operates at frequencies up to 1 MHz and provides a voltage-time product of 56.2 Vµs. The component is housed in a compact surface-mount package suitable for automated assembly processes.

Current Sense Transformers Feature Summary

• Provides precise current isolation via a fixed 1:125 transformation ratio
• Engineered for high-frequency operation up to 1 MHz
• Supports peak primary currents of 7 Amperes
• Features low impedance design with 3 milliohm primary resistance

Current Sense Transformers Applications

• Current monitoring in power supply circuits
• Overcurrent protection systems
• Feedback loop control in switching regulators

Current Sense Transformers Procurement Notes

Verify the specific ordering suffix and packaging configuration against the manufacturer's official datasheet before procurement. Confirm that the surface-mount footprint matches the target PCB layout dimensions. Ensure the selected variant meets all required electrical ratings for the intended application environment.

Current Sense Transformers Selection Notes

Select this component when isolated current measurement is required without galvanic connection to the primary circuit. The 1:125 ratio suits applications needing scaled-down secondary signals for sensing ICs. Verify that the 7 A current rating exceeds the maximum expected load current to prevent saturation or thermal issues during operation.

Current Sense Transformers Part Context

This part belongs to the WE-CST series of current sensing transformers manufactured by Würth Elektronik. These components are designed to replace traditional shunt resistors where electrical isolation is critical. The series offers various ratios and inductance values to accommodate different power electronics requirements.

Current Sense Transformers Replacement Considerations

Consult the official manufacturer documentation for confirmed substitute part numbers. Do not assume functional equivalence based on similar specifications alone. Verify pinout compatibility and mechanical dimensions if considering alternative suppliers.