MAC997B8G TRIAC Equivalent & Substitute Parts

Part Overview

The MAC997B8G is a logic-sensitive gate TRIAC manufactured by onsemi, rated for 600V off-state voltage and 800mA on-state current in a TO-92 through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across a temperature range of -40°C to 110°C and features a maximum gate trigger voltage of 2V with 3mA gate trigger current.

Substiute Parts

MAC997B8G

onsemiIn Stock: 827MAC997B8G Datasheet

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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 for the MAC997B8G is determined by the following critical parameters:

• Voltage Rating (Off State): 600V minimum required
• Current Rating (On State): Minimum 800mA; substitutes rated at 1A (1000mA) are acceptable
• Gate Trigger Characteristics: Vgt ≤ 2V and Igt ≤ 3mA define sensitive-gate operation
• Package Type: TO-92-3 through-hole configuration mandatory
• Triac Type: Logic - Sensitive Gate classification required
• Configuration: Single TRIAC only

The three STMicroelectronics substitutes (Z0103MA 1AA2, Z0107MA 1AA2, Z0109MA 1AA2) meet these core substitution criteria. All three are active products with 600V off-state voltage, 1A on-state current capability, and TO-92-3 packaging. Differences in gate trigger current (Igt) and hold current (Ih) represent acceptable parameter variations within the sensitive-gate TRIAC category.

Parameter Comparison

Engineering Selection Recommendations

All three STMicroelectronics substitutes are active products with ROHS3 compliance, providing long-term availability and regulatory alignment compared to the obsolete MAC997B8G.

Z0103MA 1AA2 matches the gate trigger current specification (Igt = 3mA maximum) most closely to the original part and features the lowest hold current (Ih = 7mA). This part is optimal for applications requiring precise gate trigger characteristics.

Z0107MA 1AA2 maintains the hold current specification (Ih = 10mA) identical to the MAC997B8G while accepting a moderate increase in gate trigger current (Igt = 5mA maximum). This part provides balanced performance across gate and hold parameters.

Z0109MA 1AA2 accepts the highest gate trigger current (Igt = 10mA maximum) among the substitutes while maintaining hold current specification (Ih = 10mA). This part is suitable for applications with less stringent gate trigger requirements.

All substitutes provide superior operating temperature range (-40°C to 125°C versus -40°C to 110°C) and higher on-state current capability (1A versus 800mA), enabling broader application flexibility.

Frequently Asked Questions (FAQ)

Q: Can Z0103MA 1AA2, Z0107MA 1AA2, and Z0109MA 1AA2 be used interchangeably with MAC997B8G?

A: Yes, within the constraints of gate trigger current requirements. All three substitutes meet the core electrical specifications: 600V off-state voltage, minimum 1A on-state current, TO-92-3 package, and logic-sensitive gate classification. Selection depends on gate trigger current tolerance in the application circuit.

Q: What is the primary difference between the three STMicroelectronics substitutes?

A: The substitutes differ in maximum gate trigger current (Igt): Z0103MA 1AA2 at 3mA, Z0107MA 1AA2 at 5mA, and Z0109MA 1AA2 at 10mA. Hold current (Ih) also varies: Z0103MA 1AA2 at 7mA versus 10mA for the other two. These differences affect gate drive circuit design and triggering sensitivity.

Q: Is the TO-92-3 package identical across all parts?

A: Yes. All parts use TO-226-3 and TO-92-3 through-hole packaging, ensuring mechanical and electrical compatibility in PCB layouts designed for the MAC997B8G.

Q: Why do the substitutes have higher operating temperature ratings?

A: The STMicroelectronics substitutes are rated to -40°C to 125°C, compared to the MAC997B8G at -40°C to 110°C. This represents a design improvement in the substitute parts and provides additional thermal margin for applications operating near temperature limits.

Q: Are the substitutes RoHS compliant?

A: Yes. All three STMicroelectronics substitutes carry ROHS3 compliance certification, whereas the obsolete MAC997B8G does not specify RoHS status. This compliance is mandatory for many modern applications and supply chain requirements.

Q: What is the significance of the 1A on-state current rating in substitutes versus 800mA in the original?

A: The substitutes provide 25% higher current capacity, enabling use in applications requiring higher load currents while maintaining the same package footprint. Existing designs rated for 800mA operation remain fully compatible.