MAC8SNG TRIAC Equivalent & Substitute Parts

Part Overview

The MAC8SNG is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse, rated for 800 V off-state voltage and 8 A on-state current in a Through Hole TO-220AB package. This component is Active in product status and widely used in AC switching applications requiring sensitive gate triggering characteristics. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and thermal operating ranges to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Value
Voltage - Off State	800 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)
Mounting Type	Through Hole
Package / Case	TO-220-3
Configuration	Single
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Criteria:

Voltage - Off State: 800 V (exact match required)
Configuration: Single (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: TO-220-3 (exact match required)
RoHS Status: ROHS3 Compliant (compliance requirement)

Secondary Compatibility Criteria:

Current - On State (It (RMS)) (Max): Equal to or greater than 8 A
Voltage - Gate Trigger (Vgt) (Max): Equal to or less than 1.5 V
Current - Gate Trigger (Igt) (Max): Equal to or less than 5 mA
Current - Hold (Ih) (Max): Equal to or less than 10 mA
Operating Temperature Range: Minimum -40°C, maximum 125°C or higher

Substitute parts are grouped into two categories based on TRIAC type: Logic - Sensitive Gate (direct electrical equivalents) and Alternistor - Snubberless (higher current capacity alternatives with compatible gate characteristics).

Parameter Comparison

Part Number	Manufacturer	TRIAC Type	Voltage - Off State	Current - On State (Max)	Voltage - Gate Trigger (Max)	Current - Gate Trigger (Max)	Current - Hold (Max)	Operating Temperature	Package
MAC8SNG	Littelfuse	Logic - Sensitive Gate	800 V	8 A	1.5 V	5 mA	10 mA	-40°C ~ 125°C	TO-220AB
BTB08-800TWRG	STMicroelectronics	Logic - Sensitive Gate	800 V	8 A	1.3 V	5 mA	10 mA	-40°C ~ 125°C	TO-220
T835T-8T	STMicroelectronics	Alternistor - Snubberless	800 V	8 A	1.3 V	35 mA	40 mA	-40°C ~ 150°C	TO-220
T635T-8T	STMicroelectronics	Alternistor - Snubberless	800 V	6 A	1.3 V	35 mA	40 mA	-40°C ~ 150°C	TO-220
T1235T-8T	STMicroelectronics	Alternistor - Snubberless	800 V	12 A	1.3 V	35 mA	40 mA	-40°C ~ 150°C	TO-220
T1635T-8T	STMicroelectronics	Alternistor - Snubberless	800 V	16 A	1.3 V	35 mA	40 mA	-40°C ~ 150°C	TO-220
Q8012RH5TP	Littelfuse Inc.	Alternistor - Snubberless	800 V	12 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	TO-220AB

Engineering Selection Recommendations

Direct Electrical Equivalent (Logic - Sensitive Gate Category):

BTB08-800TWRG from STMicroelectronics provides direct electrical equivalence to MAC8SNG with identical on-state current (8 A), gate trigger current (5 mA), and hold current (10 mA). This part meets all primary and secondary compatibility criteria and maintains the same operating temperature range. Both parts are ROHS3 Compliant and Active in product status.

Higher Current Capacity Alternatives (Alternistor - Snubberless Category):

T835T-8T, T1235T-8T, and T1635T-8T from STMicroelectronics, along with Q8012RH5TP from Littelfuse, are Alternistor - Snubberless TRIACs with 800 V off-state voltage and gate trigger voltage of 1.3 V. These parts support higher on-state currents (8 A, 12 A, and 16 A respectively) and extended operating temperature ranges up to 150°C. All are ROHS3 Compliant and Active in product status. These alternatives are suitable for applications requiring higher current capacity or enhanced thermal performance.

T635T-8T is rated for 6 A on-state current and is applicable only in applications where the 8 A requirement can be reduced without circuit performance degradation.

Frequently Asked Questions (FAQ)

Q: Can BTB08-800TWRG directly replace MAC8SNG without circuit modifications?

A: Yes. BTB08-800TWRG matches all critical electrical parameters: 800 V off-state voltage, 8 A on-state current, 1.3 V gate trigger voltage (lower than MAC8SNG's 1.5 V maximum), 5 mA gate trigger current, and 10 mA hold current. Both are Through Hole TO-220 package variants and ROHS3 Compliant. No circuit modifications are required.

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

A: Logic - Sensitive Gate TRIACs (MAC8SNG, BTB08-800TWRG) are optimized for low gate trigger current and voltage, suitable for direct microcontroller or logic circuit gate drive. Alternistor - Snubberless TRIACs (T835T-8T, T1235T-8T, T1635T-8T, Q8012RH5TP) feature higher gate trigger current and hold current specifications with enhanced surge current capability, designed for robust AC switching without external snubber networks.

Q: Can I use T1235T-8T or T1635T-8T as substitutes for MAC8SNG?

A: Yes, with application-specific considerations. Both parts meet the 800 V off-state voltage and TO-220-3 package requirements. T1235T-8T and T1635T-8T provide higher on-state current ratings (12 A and 16 A respectively) and extended operating temperature to 150°C. However, gate trigger current is 35 mA (versus 5 mA for MAC8SNG) and hold current is 40 mA (versus 10 mA), requiring higher gate drive capability. These parts are suitable for applications with available gate drive resources and benefit from improved thermal performance.

Q: Is Q8012RH5TP compatible with MAC8SNG?

A: Q8012RH5TP is compatible as a substitute with higher current capacity. It maintains 800 V off-state voltage, TO-220AB package, and ROHS3 compliance. On-state current is 12 A (exceeding the 8 A requirement), gate trigger voltage is 1.3 V (within specification), but gate trigger current is 50 mA and hold current is 50 mA (higher than MAC8SNG's 5 mA and 10 mA respectively). Gate drive circuit must support these higher current requirements.

Q: What are the package differences between TO-220AB and TO-220?

A: Both designations refer to the same TO-220-3 physical package form factor used for Through Hole mounting. TO-220AB and TO-220 are supplier-specific package naming conventions with identical mechanical and electrical interface characteristics. Parts are mechanically interchangeable.

Q: Can T635T-8T replace MAC8SNG?

A: T635T-8T is not recommended as a direct replacement. While it meets the 800 V off-state voltage and TO-220-3 package requirements, its on-state current rating is 6 A, below the MAC8SNG's 8 A specification. This part is suitable only for applications where the circuit current demand does not exceed 6 A.

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