MAC8D

Triacs Overview

The MAC8D is a silicon bidirectional thyristor (Triac) from onsemi, designed for high-performance full-wave AC control applications requiring high noise immunity and commutating di/dt. The device family includes the MAC8DG (400V), MAC8MG (600V), and MAC8NG (800V). It features an 8.0 A RMS on-state current rating at a case temperature of 100°C and supports a peak non-repetitive surge current of 80 A. The component utilizes an industry-standard TO-220 package (CASE 221A) with a junction-to-case thermal resistance of 2.2 °C/W. It operates within a junction temperature range of -40°C to +125°C.

Triacs Feature Summary

• High dv/dt immunity of 250 V/µs minimum at 125°C reduces snubber network requirements
• Uniform gate trigger currents across three quadrants for reliable switching
• High commutating di/dt capability of 6.5 A/ms minimum at 125°C
• Pb-free construction compliant with RoHS standards

Triacs Applications

• High performance full-wave AC power control circuits
• Industrial motor speed control systems
• Solid state relays requiring high noise immunity

Triacs Procurement Notes

Verify the specific voltage variant required for the application: MAC8DG for 400V, MAC8MG for 600V, or MAC8NG for 800V. Confirm that the ordering suffix corresponds to the desired blocking voltage rating. Ensure compatibility with through-hole mounting processes using the TO-220 package style. Check for any assembly location codes stamped on the package body if traceability is required.

Triacs Selection Notes

Select the appropriate voltage rating based on the maximum repetitive off-state voltage needed in the circuit. Consider the thermal management requirements given the 8.0 A RMS rating at 100°C case temperature. Evaluate the need for snubber networks; while the device minimizes them, high dv/dt environments may still require protection. Verify gate trigger current limits against the driving circuit capabilities.

Triacs Part Context

The MAC8D belongs to the MAC8xG series of silicon bidirectional thyristors manufactured by onsemi. This series is engineered for robust AC power control where high noise immunity and fast commutation are critical. The devices share identical electrical characteristics except for their peak repetitive blocking voltage ratings, which vary between 400V, 600V, and 800V depending on the suffix.

Triacs Replacement Considerations

Direct replacements include MAC8MG and MAC8NG for higher voltage ratings. For lower voltage needs, MAC8DG is available. Cross-manufacturer equivalents should be verified for matching TO-220 pinout, 8A RMS current rating, and similar dv/dt specifications.