MAC997A8 TRIAC Equivalent & Substitute Parts

Part Overview

The MAC997A8 is a logic-sensitive gate TRIAC manufactured by onsemi, rated for 600 V off-state voltage and 800 mA on-state current in a Through Hole TO-92 package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The MAC997A8 remains functionally viable for applications requiring sensitive gate triggering characteristics within its electrical specifications.

Key Parameters

Parameter	Value
Triac Type	Logic - Sensitive Gate
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	800 mA
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	10 mA
Operating Temperature Range	-40°C ~ 110°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 Long Body
Configuration	Single

Substitute Part Grouping Explanation

Substitution for the MAC997A8 is determined by the following critical parameters:

Triac Type: Logic - Sensitive Gate configuration must be maintained
Voltage - Off State: 600 V rating is required
Current - On State (It (RMS)): Substitute must support minimum 800 mA; higher ratings are acceptable
Voltage - Gate Trigger (Vgt): Maximum 2 V specification must not be exceeded
Current - Gate Trigger (Igt): Maximum 5 mA specification must not be exceeded
Current - Hold (Ih): Maximum 10 mA specification must not be exceeded
Package / Case: TO-92-3 or TO-226-3 physical compatibility required
Mounting Type: Through Hole configuration required

The STMicroelectronics Z0103MA 1AA2, Z0107MA 1AA2, and Z0109MA 1AA2 meet these substitution criteria with enhanced on-state current ratings (1 A) and improved gate trigger characteristics.

Parameter Comparison

Parameter	MAC997A8 (onsemi)	Z0103MA 1AA2 (STMicroelectronics)	Z0107MA 1AA2 (STMicroelectronics)	Z0109MA 1AA2 (STMicroelectronics)
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	600 V	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	800 mA	1 A	1 A	1 A
Voltage - Gate Trigger (Vgt) (Max)	2 V	1.3 V	1.3 V	1.3 V
Current - Non Rep. Surge 50, 60Hz (Itsm)	8 A @ 60Hz	8 A, 8.5 A	8 A, 8.5 A	8 A, 8.5 A
Current - Gate Trigger (Igt) (Max)	5 mA	3 mA	5 mA	10 mA
Current - Hold (Ih) (Max)	10 mA	7 mA	10 mA	10 mA
Operating Temperature Range	-40°C ~ 110°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)
Configuration	Single	Single	Single	Single
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three STMicroelectronics substitute parts (Z0103MA 1AA2, Z0107MA 1AA2, Z0109MA 1AA2) are classified as Active products with ROHS3 compliance, providing regulatory advantage over the obsolete MAC997A8. The substitute parts offer improved operating temperature range (-40°C ~ 125°C versus -40°C ~ 110°C) and higher on-state current capacity (1 A versus 800 mA).

Selection among the three substitutes depends on gate trigger current requirements:

Z0103MA 1AA2: Lowest gate trigger current (3 mA maximum) and hold current (7 mA maximum)
Z0107MA 1AA2: Gate trigger current matches MAC997A8 specification (5 mA maximum)
Z0109MA 1AA2: Highest gate trigger current tolerance (10 mA maximum)

All substitute parts maintain the required 600 V off-state voltage, sensitive gate configuration, and TO-92-3 package compatibility. Gate trigger voltage is improved across all substitutes (1.3 V maximum versus 2 V maximum).

Frequently Asked Questions (FAQ)

Q: Can Z0103MA 1AA2, Z0107MA 1AA2, or Z0109MA 1AA2 directly replace MAC997A8 in existing designs?

A: Yes, all three parts are pin-compatible in TO-92-3 package configuration and maintain the same triac type (Logic - Sensitive Gate) and 600 V off-state voltage rating. The higher on-state current rating (1 A versus 800 mA) provides design margin. Gate trigger characteristics differ; verify gate trigger current requirements for your specific application circuit.

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

A: The three parts differ in maximum gate trigger current specification: Z0103MA 1AA2 (3 mA), Z0107MA 1AA2 (5 mA), and Z0109MA 1AA2 (10 mA). Z0107MA 1AA2 most closely matches the MAC997A8 gate trigger current specification. Z0103MA 1AA2 offers the tightest gate trigger tolerance. Z0109MA 1AA2 provides the highest gate trigger current margin.

Q: Are the substitute parts RoHS compliant?

A: Yes, all three STMicroelectronics substitute parts (Z0103MA 1AA2, Z0107MA 1AA2, Z0109MA 1AA2) are ROHS3 compliant, whereas the MAC997A8 is RoHS non-compliant. This provides regulatory compliance advantage for new designs and updated production.

Q: What is the operating temperature difference between MAC997A8 and the substitute parts?

A: The MAC997A8 operates from -40°C to 110°C (TJ), while all three substitute parts operate from -40°C to 125°C (TJ). The substitute parts provide 15°C additional upper temperature margin.

Q: Are there any gate trigger voltage differences I should consider?

A: Yes, the MAC997A8 specifies maximum gate trigger voltage (Vgt) of 2 V, while all three substitute parts specify 1.3 V maximum. This represents improved gate sensitivity in the substitute parts. Verify that your gate drive circuit can accommodate the lower trigger voltage threshold.

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