MAC997B8 TRIAC Equivalent & Substitute Parts

Part Overview

The MAC997B8 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 MAC997B8 remains functionally available through alternative models that maintain electrical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
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)	3	mA
Current - Hold (Ih) (Max)	10	mA
Operating Temperature	-40 to 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 MAC997B8 is determined by the following critical electrical and mechanical parameters:

Voltage Rating: Off-state voltage must be 600 V or greater
Current Rating: On-state current (It (RMS)) must be equal to or exceed 800 mA
Gate Sensitivity: Voltage-gate trigger (Vgt) and current-gate trigger (Igt) must remain within acceptable limits for circuit operation
Package Compatibility: Through Hole TO-92-3 mounting required
Configuration: Single TRIAC configuration

The substitute parts Z0103MA 1AA2, Z0107MA 1AA2, and Z0109MA 1AA2 from STMicroelectronics meet these criteria. All three parts are rated for 600 V off-state voltage, 1 A on-state current (exceeding the 800 mA requirement), and are packaged in TO-92-3 Through Hole configuration. These parts are active products with RoHS3 compliance, addressing the obsolescence of the MAC997B8.

Parameter Comparison

Parameter	MAC997B8 (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 - Gate Trigger (Igt) (Max)	3 mA	3 mA	5 mA	10 mA
Current - Hold (Ih) (Max)	10 mA	7 mA	10 mA	10 mA
Operating Temperature	-40 to 110°C (TJ)	-40 to 125°C (TJ)	-40 to 125°C (TJ)	-40 to 125°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Configuration	Single	Single	Single	Single
Product Status	Obsolete	Active	Active	Active
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 active products with RoHS3 compliance, providing regulatory advantage over the obsolete MAC997B8. The substitute parts exceed the on-state current requirement (1 A versus 800 mA) and maintain 600 V voltage rating with identical package configuration.

The primary differentiation among substitute parts lies in gate trigger current specifications:

Z0103MA 1AA2: Gate trigger current (Igt) maximum of 3 mA matches the MAC997B8 specification exactly
Z0107MA 1AA2: Gate trigger current (Igt) maximum of 5 mA
Z0109MA 1AA2: Gate trigger current (Igt) maximum of 10 mA

Selection should be based on circuit gate drive requirements. The Z0103MA 1AA2 provides the closest electrical match to the original MAC997B8 specification. All substitute parts feature improved operating temperature range (-40 to 125°C versus -40 to 110°C) and are available in active production status with high inventory levels.

Frequently Asked Questions (FAQ)

Q: Can the Z0103MA 1AA2, Z0107MA 1AA2, or Z0109MA 1AA2 directly replace the MAC997B8 in existing designs?

A: Yes, all three parts are direct replacements from a mechanical and electrical standpoint. They share identical TO-92-3 Through Hole packaging, 600 V voltage rating, and exceed the 800 mA current requirement at 1 A. Gate trigger specifications differ; select based on your circuit's gate drive capability.

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

A: The three STMicroelectronics parts differ only in maximum gate trigger current (Igt): Z0103MA 1AA2 at 3 mA, Z0107MA 1AA2 at 5 mA, and Z0109MA 1AA2 at 10 mA. All other electrical parameters are identical. Choose based on your gate drive circuit requirements.

Q: Why is the MAC997B8 obsolete?

A: The MAC997B8 is classified as obsolete by onsemi. Active equivalent parts from STMicroelectronics are available and recommended for new designs and production continuity.

Q: Are the substitute parts RoHS compliant?

A: Yes, all three substitute parts (Z0103MA 1AA2, Z0107MA 1AA2, Z0109MA 1AA2) are RoHS3 compliant, whereas the MAC997B8 is RoHS non-compliant.

Q: Do the substitute parts have the same package dimensions as the MAC997B8?

A: Yes, all substitute parts use the TO-92-3 Through Hole package, which is mechanically compatible with the MAC997B8 TO-226-3, TO-92-3 Long Body package for PCB mounting.

Q: What is the operating temperature range difference?

A: The MAC997B8 operates from -40 to 110°C (TJ), while all three substitute parts operate from -40 to 125°C (TJ), providing an extended upper temperature limit of 15°C.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message