MAC8SMG TRIAC Equivalent & Substitute Parts

Part Overview

The MAC8SMG is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 600 V off-state voltage and 8 A on-state current in a TO-220AB through-hole package. This component is Active in product status and widely used in AC switching applications requiring sensitive gate triggering. Substitute parts are identified based on matching or exceeding electrical performance within the same package family, maintaining compatibility with existing circuit designs while offering alternative sourcing options.

Key Parameters

Parameter	MAC8SMG
Manufacturer	Littelfuse Inc.
Triac Type	Logic - Sensitive Gate
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	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MAC8SMG are qualified based on the following criteria:

Electrical Compatibility Requirements:

Voltage - Off State: 600 V (exact match required)
Package / Case: TO-220-3 (mechanical compatibility)
Mounting Type: Through Hole (circuit board compatibility)
Configuration: Single (functional equivalence)
RoHS Status: ROHS3 Compliant (regulatory alignment)

Current Rating Consideration: Substitutes are grouped by on-state current capacity. Parts rated at 8 A or higher are direct equivalents. Parts rated below 8 A (6 A) are downgrades suitable only when circuit design permits reduced current handling. Parts rated above 8 A (12 A, 16 A) are upgrades providing additional margin.

Gate Trigger Characteristics: All substitutes maintain sensitive gate operation with Vgt (Max) at or below 1.5 V, ensuring compatibility with existing gate drive circuits.

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage - Off State	Current - On State (Max)	Voltage - Gate Trigger (Max)	Current - Gate Trigger (Max)	Operating Temperature	Package
MAC8SMG	Littelfuse Inc.	Logic - Sensitive Gate	600 V	8 A	1.5 V	5 mA	-40°C ~ 125°C	TO-220-3
BTA06-600TRG	STMicroelectronics	Logic - Sensitive Gate	600 V	6 A	1.3 V	5 mA	-40°C ~ 125°C	TO-220-3
BTA06-600TWRG	STMicroelectronics	Logic - Sensitive Gate	600 V	6 A	1.3 V	5 mA	-40°C ~ 125°C	TO-220-3
BTB06-600TRG	STMicroelectronics	Logic - Sensitive Gate	600 V	6 A	1.3 V	5 mA	-40°C ~ 125°C	TO-220-3
BTB06-600TWRG	STMicroelectronics	Logic - Sensitive Gate	600 V	6 A	1.3 V	5 mA	-40°C ~ 125°C	TO-220-3
BTB08-600TWRG	STMicroelectronics	Logic - Sensitive Gate	600 V	8 A	1.3 V	5 mA	-40°C ~ 125°C	TO-220-3
AVS12CB	STMicroelectronics	Internally Triggered	600 V	12 A	N/A	N/A	0°C ~ 125°C	TO-220-3
T1610H-6T	STMicroelectronics	Logic - Sensitive Gate	600 V	16 A	1.3 V	10 mA	-40°C ~ 150°C	TO-220-3

Engineering Selection Recommendations

Direct Equivalents (Same Current Rating): BTB08-600TWRG is the primary direct substitute, matching the 8 A on-state current rating of the MAC8SMG while maintaining identical 600 V voltage rating, TO-220-3 package, and sensitive gate operation. Both components are ROHS3 compliant and Active in product status.

Current Upgrade Options: T1610H-6T provides a 16 A on-state current rating, suitable for applications requiring additional thermal margin or higher load capacity. Operating temperature extends to 150°C, exceeding the MAC8SMG specification. AVS12CB offers 12 A rating but operates as an Internally Triggered TRIAC, eliminating gate trigger requirements and altering circuit interface requirements.

Current Downgrade Options: BTA06-600TRG, BTA06-600TWRG, BTB06-600TRG, and BTB06-600TWRG all provide 6 A on-state current ratings. These are suitable only when circuit design permits reduced current handling. All maintain 600 V voltage rating, TO-220-3 package, and sensitive gate operation with lower gate trigger voltage (1.3 V vs. 1.5 V).

Compliance and Availability: All substitute parts maintain ROHS3 compliance and Active product status, ensuring regulatory alignment and continued manufacturing support. Inventory availability varies across part numbers, with T1610H-6T showing highest stock levels (11,159 pcs).

Frequently Asked Questions (FAQ)

Q: Can I use a 6 A rated TRIAC in place of the MAC8SMG 8 A part? A: Only if your circuit design permits operation at reduced current capacity. The 6 A parts (BTA06 and BTB06 series) are electrical downgrades. Verify that your maximum load current does not exceed 6 A RMS before substitution.

Q: What is the difference between BTA06-600TRG and BTA06-600TWRG? A: Both parts share identical electrical specifications: 600 V, 6 A, Logic - Sensitive Gate, TO-220-3 package. The difference lies in packaging format (Tube vs. alternative packaging) and supplier device package designation. Electrical performance and pin configuration are equivalent.

Q: Is the AVS12CB a suitable substitute? A: AVS12CB differs functionally from the MAC8SMG. It is an Internally Triggered TRIAC, eliminating the need for external gate drive signals. This requires circuit redesign and is not a direct pin-compatible substitute. Use only if your application can accommodate internally triggered operation.

Q: Why does T1610H-6T have different gate trigger current (10 mA vs. 5 mA)? A: T1610H-6T is rated for higher on-state current (16 A) and exhibits proportionally higher gate trigger current. Verify that your gate drive circuit can supply 10 mA before substitution.

Q: Are all substitutes available in the same TO-220-3 package? A: Yes. All listed substitutes use TO-220-3 through-hole package, ensuring mechanical and pin compatibility with existing PCB layouts.

Q: What is the temperature operating range difference between MAC8SMG and substitutes? A: MAC8SMG operates -40°C to 125°C. Most STMicroelectronics substitutes match this range. T1610H-6T extends to 150°C. AVS12CB operates 0°C to 125°C, with a narrower low-temperature range. Verify application temperature requirements before selection.

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