MAC8SM TRIAC Equivalent & Substitute Parts

Part Overview

The MAC8SM is a logic-sensitive gate TRIAC manufactured by onsemi, rated for 600V off-state voltage and 8A on-state current in a TO-220-3 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain electrical compatibility across gate trigger characteristics, thermal performance, and mechanical mounting requirements.

Key Parameters

Parameter	Value
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	10 mA
Operating Temperature Range	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
Triac Type	Logic - Sensitive Gate

Substitute Part Grouping Explanation

Substitution for the MAC8SM is determined by the following criteria:

Direct Electrical Equivalents: Parts maintaining identical or superior ratings across voltage, current, and gate trigger parameters while preserving the TO-220-3 package footprint and through-hole mounting configuration.

Key Substitution Parameters:

Voltage - Off State: minimum 600V
Current - On State (It (RMS)): minimum 8A
Voltage - Gate Trigger (Vgt): maximum 1.5V
Current - Gate Trigger (Igt): maximum 5mA
Current - Hold (Ih): maximum 10mA
Package: TO-220-3 through-hole
Triac Type: Logic - Sensitive Gate

Grouping Logic:

Group 1 - Direct Replacement (8A Rating): MAC8SMG and BTB08-600TWRG maintain the full 8A on-state current specification, providing pin-compatible substitution with identical electrical performance envelopes.

Group 2 - Functional Substitutes (6A Rating): BTA06-600TWRG and BTB06-600TRG provide 6A on-state current with 600V off-state voltage. These parts are suitable for applications where the load current does not exceed 6A, offering active product status and compliance advantages.

Parameter Comparison

Parameter	MAC8SM (onsemi)	MAC8SMG (Littelfuse)	BTB08-600TWRG (STMicroelectronics)	BTA06-600TWRG (STMicroelectronics)	BTB06-600TRG (STMicroelectronics)	BTB06-600TWRG (STMicroelectronics)
Voltage - Off State	600 V	600 V	600 V	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	8 A	8 A	8 A	6 A	6 A	6 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	1.3 V	1.3 V	1.3 V	1.3 V
Current - Non Rep. Surge 50, 60Hz (Itsm)	70A @ 60Hz	70A @ 60Hz	80A, 84A	60A, 63A	60A, 63A	60A, 63A
Current - Gate Trigger (Igt) (Max)	5 mA	5 mA	5 mA	5 mA	5 mA	5 mA
Current - Hold (Ih) (Max)	10 mA	10 mA	10 mA	10 mA	10 mA	10 mA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Identical Current Rating):

MAC8SMG (Littelfuse Inc.) is the primary direct substitute. It maintains 8A on-state current, 600V off-state voltage, and TO-220-3 package compatibility. The part is active in production status and ROHS3 compliant, addressing the obsolescence and compliance limitations of the MAC8SM.

BTB08-600TWRG (STMicroelectronics) provides equivalent 8A current performance with improved surge current rating (80A, 84A vs. 70A). This part is active and ROHS3 compliant, suitable for applications requiring enhanced transient protection.

For Current-Reduced Applications (6A Maximum Load):

BTA06-600TWRG and BTB06-600TRG (STMicroelectronics) are functionally equivalent for circuits designed for 6A or lower on-state current. Both parts feature lower gate trigger voltage (1.3V vs. 1.5V), active product status, and ROHS3 compliance. BTB06-600TWRG offers the same surge current specification (60A, 63A) as BTA06-600TWRG.

All substitute parts maintain identical gate trigger current (5mA), hold current (10mA), and operating temperature range (-40°C ~ 125°C), ensuring thermal and control circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can MAC8SMG directly replace MAC8SM in existing designs?

A: Yes. MAC8SMG maintains identical electrical specifications (8A, 600V, 1.5V gate trigger) and TO-220-3 package configuration. The primary advantages are active production status and ROHS3 compliance.

Q: What is the difference between 8A and 6A rated TRIACs in this family?

A: The on-state current rating determines maximum continuous load current. MAC8SM and MAC8SMG support 8A RMS, while BTA06-600TWRG, BTB06-600TRG, and BTB06-600TWRG support 6A RMS. Selection depends on circuit load requirements. All parts share identical gate trigger and hold current specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. MAC8SMG, BTB08-600TWRG, BTA06-600TWRG, BTB06-600TRG, and BTB06-600TWRG are all ROHS3 compliant. The original MAC8SM is non-compliant.

Q: Do gate trigger voltage differences affect circuit design?

A: MAC8SM and MAC8SMG specify 1.5V maximum gate trigger voltage. STMicroelectronics parts (BTB08-600TWRG, BTA06-600TWRG, BTB06-600TRG, BTB06-600TWRG) specify 1.3V maximum. The lower specification provides improved gate sensitivity but does not require circuit redesign for standard gate drive circuits.

Q: What is the significance of surge current ratings?

A: Non-repetitive surge current (Itsm) indicates transient overcurrent capability. MAC8SM and MAC8SMG are rated 70A @ 60Hz. BTB08-600TWRG provides 80A-84A, and 6A-rated parts provide 60A-63A. Higher ratings offer greater protection against inrush currents and transient events.

Q: Are all substitute parts available in the same package?

A: Yes. All parts use TO-220-3 through-hole package with identical pin configuration and mechanical footprint, enabling direct PCB substitution without layout modification.

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