MAC9D

Triacs Overview

The MAC9DG is a silicon bidirectional thyristor (Triac) manufactured by onsemi, designed for high-performance full-wave AC control applications requiring high noise immunity and commutating di/dt. It features an 800 V peak repetitive off-state voltage rating and an 8.0 A RMS on-state current at a case temperature of 100°C. The device operates within a junction temperature range of -40°C to +125°C and utilizes a TO-220 package (Case 221A). Key electrical characteristics include a minimum critical rate of rise of off-state voltage (dv/dt) of 500 V/µs at 125°C and a minimum commutating di/dt of 6.5 A/ms at 125°C.

Triacs Feature Summary

• High dv/dt immunity minimizes the need for external snubber networks in protection circuits.
• Uniform gate trigger currents across three quadrants facilitate reliable switching with microprocessor drivers.
• Robust commutating di/dt capability ensures stability during rapid current changes in AC loads.

Triacs Applications

• Full-wave AC power control systems
• Solid-state relays
• Motor speed control circuits

Triacs Procurement Notes

Verify component authenticity through authorized distribution channels or direct manufacturer engagement. Confirm RoHS compliance status and Pb-free packaging details against the latest datasheet revisions. Ensure ordering suffixes match specific thermal and mechanical requirements for the intended assembly process.

Triacs Selection Notes

Select the MAC9DG when high blocking voltage and robust noise immunity are required for AC load switching. Evaluate thermal management needs based on the specified 8.0 A RMS rating at 100°C case temperature. Consider the TO-220 package dimensions for PCB layout and heatsinking compatibility in high-power designs.

Triacs Part Context

The MAC9DG belongs to the MAC9xG series, which includes variants with different voltage ratings such as the MAC9MG (600V) and MAC9NG (800V). This family is engineered for industrial and consumer AC control applications where reliability under high stress conditions is critical. The devices share similar pinouts and thermal characteristics, allowing for design flexibility within the same package form factor.

Triacs Replacement Considerations

Direct substitutes within the same series include the MAC9MG and MAC9NG, provided their respective voltage ratings meet circuit requirements. Verify that alternative Triacs offer comparable dv/dt and di/dt specifications to maintain system stability without modifying existing snubber networks.