BTA420X-800CT,127

Triacs Overview

The BTA420X-800CT,127 is a planar passivated high commutation three quadrant triac manufactured by WeEn Semiconductors. It is housed in a SOT78 (TO-220AB) plastic package designed for through-hole mounting. The device supports an RMS on-state current of 20 A and withstands a rated repetitive peak off-state voltage of 800 V. It features a non-repetitive surge current capacity of 200 A and a maximum junction temperature of 150 °C. Key electrical parameters include a gate trigger current of 35 mA across quadrants Q1, Q2, and Q3, and a static/dynamic dv/dt rating of 1250 V/µs.

Triacs Feature Summary

• Planar passivated construction ensures robust performance under high commutation conditions.
• Three-quadrant sensitivity provides reliable triggering across all gate polarities.
• Capable of full RMS current commutation at maximum rated junction temperature without snubber assistance.

Triacs Applications

• High-power motor speed control systems
• Industrial heating regulation circuits
• Lighting dimmer applications requiring high thermal stability

Triacs Procurement Notes

Verify the specific suffix CT to confirm the TO-220AB package and industrial qualification level. Confirm RoHS compliance status and lead-free conversion dates via official manufacturer documentation before procurement. Ensure ordering quantities align with standard packing configurations to avoid partial reel issues.

Triacs Selection Notes

Select this component when circuit designs demand high thermal endurance up to 150 °C and immunity to false triggering from rapid voltage changes. The 20 A RMS rating suits moderate-to-high power AC loads. Verify that the 35 mA gate drive capability matches the available control interface current limits.

Triacs Part Context

This part belongs to the BTA420 series of high-commutation triacs. It shares the core three-quadrant architecture with other variants but differs in packaging and specific thermal ratings. The CT suffix denotes the TO-220AB form factor, distinguishing it from surface-mount or smaller through-hole alternatives within the same family.

Triacs Replacement Considerations

Direct substitutes must match the 20 A RMS, 800 V rating, and TO-220AB package. Verify equivalent dv/dt ratings and gate trigger currents to ensure circuit compatibility without redesign.