SK225LDTP

Overview

The SK225LDTP is a silicon controlled rectifier (SCR) manufactured by Littelfuse Inc., designed for high-voltage power control applications. It features a standard recovery characteristic and is housed in a TO-220AB through-hole package. The device supports an on-state RMS current of 25 A and withstands off-state voltages up to 1.2 kV. Key electrical parameters include a maximum gate trigger voltage of 1.5 V and a maximum gate trigger current of 40 mA. The component is rated for non-repetitive on-state surge currents of 360 A, ensuring robust performance in demanding circuit environments.

Feature Summary

• Standard recovery thyristor construction for reliable switching
• Through-hole mounting capability via TO-220AB package
• High voltage blocking capability suitable for industrial power systems

Applications

• Industrial motor control circuits
• Power supply regulation systems
• High-voltage DC switching applications

Procurement Notes

Verify the specific suffix 'LDTP' against the manufacturer's official datasheet to confirm pinout configuration and thermal characteristics. Ensure that the procurement source provides valid documentation confirming the part status as active or obsolete, as availability may vary across distributors. Cross-reference the lot code and manufacturing date with Littelfuse specifications to guarantee compliance with required environmental standards and material declarations.

Selection Notes

Select this component when a through-hole SCR with 1.2 kV blocking voltage and 25 A continuous current rating is required. Consider the TO-220AB package for adequate heat dissipation without additional external heatsinks in moderate load scenarios. Evaluate the gate trigger requirements against the driving circuit capabilities, noting the 1.5 V and 40 mA maximum limits. Compare thermal resistance values if operating near the upper temperature range.

Part Context

This part belongs to the Littelfuse SCR family, specifically engineered for general-purpose power control. The SK series typically offers robust surge handling and standard recovery times, making it suitable for AC/DC conversion and phase control tasks. The TO-220AB form factor allows for easy integration into legacy and new PCB designs requiring high reliability.

Replacement Considerations

Check Littelfuse cross-reference guides for direct replacements. Verify that any substitute maintains the 1.2 kV voltage rating, 25 A current capacity, and TO-220AB footprint. Confirm identical gate trigger specifications to ensure circuit compatibility.