BT149D,112

Scrs Overview

The BT149D,112 is a planar passivated Silicon Controlled Rectifier (SCR) manufactured by WeEn Semiconductors. It is housed in a SOT54 (TO-92) plastic package with straight leads. The device features a sensitive gate designed for direct interfacing with microcontrollers and logic ICs. Key electrical parameters include a repetitive peak reverse/direct voltage of 400V, an average on-state current of 0.5A, and an RMS on-state current of 0.8A. The surge current rating is 8A, with a maximum gate trigger current of 0.2mA. It supports a critical rate of rise of off-state voltage of 500V/µs and operates at a maximum junction temperature of 125°C.

Scrs Feature Summary

• Sensitive gate architecture enabling direct interface with low power gate trigger circuits
• Planar passivated construction for enhanced reliability
• Logic level compatibility for integration with microcontrollers

Scrs Applications

• General purpose switching applications
• Phase control circuits
• Direct interfacing with microcontrollers and logic integrated circuits

Scrs Procurement Notes

Verify the specific ordering suffix to confirm packaging configuration. The BT149D,112 designation corresponds to bulk pack straight leads in TO-92 packages. Confirm RoHS compliance status and lead-free plating requirements against current datasheet specifications before procurement. Ensure the supplier provides valid traceability documentation for industrial qualification standards.

Scrs Selection Notes

Select this component when a compact SCR with low gate drive current is required for logic-level control. The 400V voltage rating suits general purpose AC phase control where moderate current handling is sufficient. Consider the TO-92 package constraints for thermal management in high-duty cycle applications compared to higher current thyristor packages.

Scrs Part Context

This part belongs to the BT149 series of logic level silicon controlled rectifiers from WeEn Semiconductors. The series includes variants with different voltage ratings, such as the BT149G which offers 600V blocking capability. These devices are engineered for cost-effective solutions in consumer electronics and industrial control systems requiring reliable switching performance.

Scrs Replacement Considerations

The BT149G serves as a higher voltage alternative within the same series offering 600V rating. Other logic level SCRs like the BT169 may be considered for different current or voltage requirements. Verify pinout compatibility and thermal characteristics when substituting with similar components from other manufacturers.