CST25K

Overview

The CST25K is a current sense transformer manufactured by Triad Magnetics, designed for PCB mounting applications. It features a turns ratio of 1:200 and operates within a frequency range of 50 kHz to 500 kHz. The component has an inductance of 76 mH and a secondary coil resistance of 4.5 ohms. It supports a rated current of 25 A and utilizes solder pin termination for through-hole installation. The physical dimensions are 17 mm in length, 15 mm in width, and 11.8 mm in height.

Feature Summary

• Provides galvanic isolation for accurate current sensing in high-frequency circuits
• Supports through-hole PCB mounting with solder pin termination
• Operates effectively across a wide frequency band from 50 kHz to 500 kHz

Applications

• Switch-mode power supply (SMPS) primary side current monitoring
• Inverter and motor drive overcurrent protection circuits
• Industrial power converter feedback loops

Procurement Notes

Verify the specific suffix or variant against the official Triad Magnetics datasheet to ensure compatibility with your design requirements. Confirm that the package style matches your PCB footprint and that the thermal ratings align with your operating environment. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a 1:200 turns ratio and 25 A current rating are required for through-hole current sensing. Ensure the application frequency falls within the 50 kHz to 500 kHz range for optimal performance. Consider the 76 mH inductance value for circuit stability and the 4.5 ohm secondary resistance for load matching in signal conditioning stages.

Part Context

The CST25K belongs to the CST series of current sense transformers from Triad Magnetics. This series is engineered for robust performance in power electronics, offering reliable isolation and precise current replication. The component is distinct from general-purpose audio or power transformers due to its specialized magnetic core design optimized for high-frequency current sensing applications.

Replacement Considerations

Publicly confirmed substitute part numbers for the CST25K are not available in the provided documentation. Verify compatibility with alternative models by comparing electrical parameters such as turns ratio, inductance, and current rating.