MAC8MG TRIAC 600V 8A TO-220AB Equivalent & Substitute Parts

Part Overview

The MAC8MG is a standard TRIAC thyristor manufactured by Littelfuse, rated for 600V off-state voltage and 8A on-state current in a TO-220AB through-hole package. This component is active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications within the allowed parameter ranges for TRIAC thyristor applications.

Key Parameters

Parameter	MAC8MG Value	Unit
Voltage - Off State	600	V
Current - On State (It (RMS)) (Max)	8	A
Voltage - Gate Trigger (Vgt) (Max)	1.5	V
Current - Non Rep. Surge 50, 60Hz (Itsm)	80	A @ 60Hz
Current - Gate Trigger (Igt) (Max)	35	mA
Current - Hold (Ih) (Max)	40	mA
Operating Temperature	-40 to 125	°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
Triac Type	Standard

Substitute Part Grouping Explanation

Substitution for the MAC8MG is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - Off State: 600V minimum
Package / Case: TO-220-3 through-hole configuration
Mounting Type: Through Hole
Configuration: Single

Allowable Parameter Ranges for Substitution:

Current - On State (It (RMS)): Equal to or greater than 8A
Voltage - Gate Trigger (Vgt): Equal to or less than 1.5V
Current - Non Rep. Surge (Itsm): Equal to or greater than 80A
Current - Gate Trigger (Igt): Equal to or less than 35mA
Current - Hold (Ih): Equal to or less than 40mA
Operating Temperature: Must include the -40°C to 125°C range or extend it

Substitute parts are grouped by TRIAC type classification (Standard, Internally Triggered, Logic - Sensitive Gate, or Alternistor - Snubberless) based on the provided specifications. All substitute parts listed maintain active product status and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage - Off State (V)	Current - On State (A)	Vgt (Max) (V)	Itsm (A)	Igt (Max) (mA)	Ih (Max) (mA)	Operating Temp (°C)	Package
MAC8MG	Littelfuse	Standard	600	8	1.5	80	35	40	-40 to 125	TO-220-3
T835H-6I	STMicroelectronics	Alternistor - Snubberless	600	8	1.0	80, 84	35	35	-40 to 150	TO-220-3
BTB08-600CWRG	STMicroelectronics	Alternistor - Snubberless	600	8	1.3	80, 84	35	35	-40 to 125	TO-220-3
BTA08-600CWRG	STMicroelectronics	Alternistor - Snubberless	600	8	1.3	80, 84	35	35	-40 to 125	TO-220-3
BTA10-600CWRG	STMicroelectronics	Alternistor - Snubberless	600	10	1.3	100, 105	35	35	-40 to 125	TO-220-3
AVS12CB	STMicroelectronics	Internally Triggered	600	12	N/A	100, 105	N/A	N/A	0 to 125	TO-220-3
BT138-600,127	WeEn Semiconductors	Standard	600	12	1.5	95, 105	35	30	-40 to 125	TO-220-3
BT138-600E,127	WeEn Semiconductors	Logic - Sensitive Gate	600	12	1.5	95, 105	10	30	-40 to 125	TO-220-3
T1610H-6T	STMicroelectronics	Logic - Sensitive Gate	600	16	1.3	160, 168	10	15	-40 to 150	TO-220-3

Engineering Selection Recommendations

All listed substitute parts maintain active product status and RoHS3 compliance equivalent to the MAC8MG. Selection among substitutes depends on application-specific requirements:

Direct Current Rating Match (8A): T835H-6I, BTB08-600CWRG, and BTA08-600CWRG provide 8A on-state current matching the MAC8MG. T835H-6I offers extended operating temperature range to 150°C. BTB08-600CWRG and BTA08-600CWRG maintain the standard -40°C to 125°C range.

Higher Current Capacity (10A and above): BTA10-600CWRG (10A), AVS12CB (12A), BT138-600,127 (12A), BT138-600E,127 (12A), and T1610H-6T (16A) provide increased on-state current capacity while maintaining 600V off-state voltage and TO-220-3 package compatibility.

Gate Trigger Sensitivity: BT138-600E,127 and T1610H-6T feature Logic - Sensitive Gate classification with reduced gate trigger current (10mA maximum) compared to the MAC8MG (35mA maximum). T835H-6I offers reduced gate trigger voltage (1.0V maximum) within the Alternistor - Snubberless series.

Temperature Range Considerations: T835H-6I and T1610H-6T extend the maximum operating temperature to 150°C, providing thermal margin beyond the MAC8MG specification. AVS12CB operates from 0°C minimum, narrower than the MAC8MG -40°C minimum.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher on-state current rating than the MAC8MG?

A: Yes. Parts rated for 10A, 12A, or 16A on-state current are suitable substitutes provided all other parameters remain within allowable ranges. Higher current capacity does not compromise compatibility in applications requiring 8A or less.

Q: What is the difference between Standard, Alternistor - Snubberless, Internally Triggered, and Logic - Sensitive Gate TRIAC types?

A: These classifications describe internal circuit architecture and triggering characteristics. Standard TRIACs (MAC8MG, BT138-600,127) use conventional gate triggering. Alternistor - Snubberless types (T835H-6I, BTA08-600CWRG, BTA10-600CWRG, BTB08-600CWRG) incorporate snubberless technology for reduced EMI. Internally Triggered TRIACs (AVS12CB) feature integrated gate triggering circuits. Logic - Sensitive Gate types (BT138-600E,127, T1610H-6T) require lower gate trigger current for logic-level control.

Q: Are all substitute parts available in the same TO-220-3 package as the MAC8MG?

A: Yes. All listed substitute parts use TO-220-3 through-hole package configuration, ensuring mechanical and thermal interface compatibility with existing PCB layouts and heatsink mounting.

Q: What is the significance of gate trigger voltage (Vgt) and gate trigger current (Igt) specifications?

A: Vgt and Igt define the minimum voltage and current required to switch the TRIAC from off-state to on-state. Lower values indicate higher gate sensitivity. Substitutes with equal or lower Vgt and Igt values maintain or improve gate control characteristics compared to the MAC8MG.

Q: Can I substitute the MAC8MG with AVS12CB if my application requires -40°C operation?

A: No. AVS12CB operates from 0°C minimum, which does not meet the MAC8MG -40°C minimum requirement. Select substitutes that maintain the full -40°C to 125°C operating temperature range or verify application temperature limits before substitution.

Q: How do I determine which substitute part is best for my application?

A: Verify that the substitute part meets or exceeds the MAC8MG specifications for voltage (600V), current (8A minimum), gate trigger parameters, and operating temperature range. Confirm package compatibility (TO-220-3) and review the TRIAC type classification to ensure gate triggering method compatibility with your circuit design.

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