BT258-800R,127

Scrs Overview

The BT258-800R,127 is a passivated, sensitive gate thyristor manufactured by WeEn Semiconductors in a TO220 plastic envelope. Designed for general purpose switching and phase control applications, it interfaces directly with microcontrollers and logic integrated circuits. Key electrical parameters include a repetitive peak reverse voltage of 800 V, an average on-state current of 5 A, and a non-repetitive peak surge current of 75 A. The device features a maximum DC gate trigger current of 0.2 mA and a critical rate of rise of off-state voltage of 50 V/us, with a maximum junction temperature of 125 °C.

Scrs Feature Summary

• Sensitive gate architecture enabling direct interfacing with low power gate trigger circuits such as microcontrollers and logic ICs.
• Planar passivated silicon construction providing high bidirectional blocking voltage capability and robust thermal cycling performance.

Scrs Applications

• General purpose switching
• Phase control applications

Scrs Procurement Notes

Verify the complete orderable part number includes the trailing suffix (e.g., ,127) to ensure correct packaging configuration. Confirm RoHS compliance status and lead-free plating specifications against the latest datasheet revision. Ensure the procurement request specifies the TO220 package variant distinct from surface mount alternatives within the same family.

Scrs Selection Notes

Select this component when a through-hole SCR with logic-level gate sensitivity is required for industrial environments. The 800 V rating suits medium-voltage AC control tasks. Verify that the 5 A average current and 75 A surge capacity meet the specific load requirements. Consider the TO220 package for ease of heatsinking compared to smaller form factors.

Scrs Part Context

This device belongs to the BT258 series of logic level thyristors. It shares core electrical characteristics with variants like the BT258X-800R and BT258S-800R, differing primarily in physical package type. The series is designed for applications requiring reliable switching with minimal gate drive power, serving as a bridge between low-power digital control and higher-power AC loads.

Scrs Replacement Considerations

Direct substitutes include the BT258X-800R (TO220F package) and BT258S-800R (TO252 package). These parts share identical electrical ratings but differ in mounting style. Verify board space and thermal management constraints before substituting a surface-mount or tab-less variant for the standard TO220 through-hole version.