MAC997A8G TRIAC Equivalent & Substitute Parts

Part Overview

The MAC997A8G is a Logic-Sensitive Gate TRIAC manufactured by onsemi, rated for 600V off-state voltage with 800mA on-state current in a TO-92 through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. Substitute parts must maintain compatibility across voltage ratings, current handling, gate trigger characteristics, and thermal operating ranges to ensure functional equivalence in circuit applications.

Substiute Parts

MAC997A8G

onsemiIn Stock: 1132MAC997A8G Datasheet

Current PartRFQ

Z0103MA 1AA2

STMicroelectronicsIn Stock: 90422Z0103MA 1AA2 Datasheet

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Z0107MA 1AA2

STMicroelectronicsIn Stock: 6239Z0107MA 1AA2 Datasheet

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Z0109MA 1AA2

STMicroelectronicsIn Stock: 90145Z0109MA 1AA2 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MAC997A8G is determined by the following critical parameters:

• Voltage Rating (Off-State): Must equal or exceed 600V to maintain voltage withstand capability
• Current Rating (On-State): Must support at least 800mA RMS to handle the design current load
• Gate Trigger Voltage (Vgt): Must not exceed 2V maximum to ensure gate drive compatibility
• Gate Trigger Current (Igt): Must not exceed 5mA maximum to maintain gate circuit compatibility
• Hold Current (Ih): Must not exceed 10mA maximum for circuit stability
• Surge Current (Itsm): Must support 8A minimum at 60Hz for transient protection
• Package / Case: Must be TO-226-3 or TO-92-3 for mechanical and thermal compatibility
• Mounting Type: Must be Through Hole to match PCB assembly requirements

The three substitute parts listed below meet all these criteria while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

All three STMicroelectronics substitute parts (Z0103MA 1AA2, Z0107MA 1AA2, Z0109MA 1AA2) are functionally equivalent to the MAC997A8G and meet the required electrical and mechanical specifications. Key advantages of these substitutes include:

• Active Product Status: All substitutes are in active production, ensuring long-term availability and supply chain continuity
• RoHS3 Compliance: All substitutes meet ROHS3 environmental standards, supporting modern manufacturing and regulatory requirements
• Enhanced Current Rating: All substitutes provide 1A on-state current, exceeding the 800mA requirement and offering design margin
• Extended Temperature Range: Operating range extends to 125°C, providing improved thermal headroom compared to the 110°C maximum of the original part
• Improved Gate Characteristics: All substitutes feature lower gate trigger voltage (1.3V vs. 2V), reducing gate drive circuit complexity

Selection among the three substitutes should be based on specific gate trigger current requirements: Z0103MA 1AA2 (3mA Igt), Z0107MA 1AA2 (5mA Igt), or Z0109MA 1AA2 (10mA Igt). All three maintain compatibility with the original MAC997A8G circuit design parameters.

Frequently Asked Questions (FAQ)

Q: Can Z0103MA 1AA2, Z0107MA 1AA2, or Z0109MA 1AA2 directly replace MAC997A8G in existing designs?

A: Yes. All three substitute parts meet or exceed the electrical specifications of the MAC997A8G, including voltage rating, current handling, gate trigger characteristics, and thermal operating range. The TO-92-3 package is mechanically compatible with the original TO-92-3 Long Body footprint for through-hole PCB assembly.

Q: What is the difference between the three substitute options?

A: The primary difference is gate trigger current (Igt): Z0103MA 1AA2 specifies 3mA maximum, Z0107MA 1AA2 specifies 5mA maximum (matching the original), and Z0109MA 1AA2 specifies 10mA maximum. Gate trigger voltage is identical across all three (1.3V maximum). Selection depends on gate drive circuit design requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three STMicroelectronics substitute parts are ROHS3 compliant, meeting current environmental and regulatory standards for electronic component manufacturing.

Q: What is the temperature operating range difference?

A: The MAC997A8G operates from -40°C to 110°C (TJ). All three substitute parts extend this range to -40°C to 125°C (TJ), providing an additional 15°C of thermal margin for high-temperature applications.

Q: Is the on-state current rating difference significant?

A: The MAC997A8G is rated for 800mA on-state current, while all substitutes are rated for 1A. This 200mA increase provides design margin and improved thermal performance in current-limited applications. Existing designs operating at or below 800mA will operate safely with the higher-rated substitutes.

Q: Are there any package or mounting differences?

A: No. All substitute parts use the TO-226-3 / TO-92-3 through-hole package, maintaining identical PCB footprint and assembly compatibility with the original MAC997A8G.