MAC12MG TRIAC 600V 12A Equivalent & Substitute Parts

Part Overview

The MAC12MG is a standard TRIAC thyristor manufactured by Littelfuse Inc., rated for 600V off-state voltage and 12A on-state current in a TO-220AB through-hole package. This component is active in production with 4344 units in stock. TRIAC substitutes are necessary when addressing supply constraints, specific gate trigger characteristics, thermal performance requirements, or alternative snubberless technology options while maintaining electrical compatibility within the 600V/12A operating envelope.

Key Parameters

Parameter	MAC12MG Value
Voltage - Off State	600 V
Current - On State (It RMS Max)	12 A
Voltage - Gate Trigger (Vgt Max)	1.5 V
Current - Gate Trigger (Igt Max)	35 mA
Current - Hold (Ih Max)	40 mA
Current - Non Rep. Surge (Itsm)	100 A @ 60Hz
Operating Temperature Range	-40°C to 125°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
Triac Type	Standard
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Compatibility Requirements:

Voltage - Off State: 600V (exact match required)
Current - On State: 12A minimum (equal or greater acceptable)
Package / Case: TO-220-3 (mechanical compatibility)
Mounting Type: Through Hole (board-level compatibility)

Secondary Compatibility Factors:

Gate trigger voltage (Vgt) and current (Igt) characteristics determine circuit behavior; variations within specified ranges are acceptable
Hold current (Ih) variations are acceptable within the specified ranges
Surge current (Itsm) ratings of 100A or greater satisfy the requirement
Operating temperature range of -40°C to 125°C or wider is acceptable
ROHS3 compliance and REACH unaffected status are maintained across all substitutes

Triac Type Variations: Substitutes include Standard, Alternistor (Snubberless), and Internally Triggered variants. Each type operates within the 600V/12A envelope but exhibits different gate sensitivity and EMI characteristics. Selection depends on application-specific requirements for gate drive circuitry and noise immunity.

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage (V)	Current (A)	Vgt Max (V)	Igt Max (mA)	Ih Max (mA)	Itsm (A)	Temp Range (°C)	Package
MAC12MG	Littelfuse Inc.	Standard	600	12	1.5	35	40	100	-40 to 125	TO-220AB
Q6012RH5TP	Littelfuse Inc.	Alternistor - Snubberless	600	12	1.3	50	50	110, 120	-40 to 125	TO-220
AVS12CB	STMicroelectronics	Internally Triggered	600	12	—	—	—	100, 105	0 to 125	TO-220
BT138-600,127	WeEn Semiconductors	Standard	600	12	1.5	35	30	95, 105	0 to 125	TO-220AB
BT138-600E,127	WeEn Semiconductors	Logic - Sensitive Gate	600	12	1.5	10	30	95, 105	0 to 125	TO-220AB
BTA08-600CWRG	STMicroelectronics	Alternistor - Snubberless	600	8	1.3	35	35	80, 84	-40 to 125	TO-220
BTA10-600CWRG	STMicroelectronics	Alternistor - Snubberless	600	10	1.3	35	35	100, 105	-40 to 125	TO-220
BTB08-600CWRG	STMicroelectronics	Alternistor - Snubberless	600	8	1.3	35	35	80, 84	-40 to 125	TO-220
BTB12-600BRG	STMicroelectronics	Standard	600	12	1.3	50	50	120, 126	-40 to 125	TO-220
BTB12-600BWRG	STMicroelectronics	Alternistor - Snubberless	600	12	1.3	50	50	120, 126	-40 to 125	TO-220
BTB12-600CRG	STMicroelectronics	Standard	600	12	1.3	25	25	120, 126	-40 to 125	TO-220

Engineering Selection Recommendations

Direct Equivalents (600V/12A, Standard Type): BT138-600,127 and BTB12-600BRG maintain the standard TRIAC architecture with 600V/12A ratings. Both are ROHS3 compliant and REACH unaffected. BT138-600,127 operates from 0°C to 125°C; BTB12-600BRG extends to -40°C to 125°C. Selection depends on lower temperature operation requirements.

Snubberless Alternistor Option (600V/12A): Q6012RH5TP and BTB12-600BWRG provide Alternistor technology with identical 600V/12A ratings. Both operate across -40°C to 125°C. These variants reduce EMI and eliminate snubber network requirements in certain applications. Higher surge current ratings (110A–126A) provide additional margin.

Sensitive Gate Variant: BT138-600E,127 reduces gate trigger current to 10 mA maximum, enabling direct logic-level gate drive without intermediate amplification. Maintains 600V/12A ratings and ROHS3 compliance.

Internally Triggered Option: AVS12CB (STMicroelectronics) eliminates gate drive requirements through internal triggering. Operates 0°C to 125°C. Suitable for applications where gate signal generation is impractical.

Lower Current Ratings (Not Direct Equivalents): BTA08-600CWRG, BTB08-600CWRG, and BTA10-600CWRG are rated 8A and 10A respectively. These are not direct substitutes for 12A applications but may be considered only if circuit design permits reduced current capacity.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. Product status is active for all listed parts.

Frequently Asked Questions (FAQ)

Q: Can BTA08-600CWRG or BTA10-600CWRG replace MAC12MG in a 12A application? A: No. These parts are rated 8A and 10A respectively. They do not meet the 12A on-state current requirement of the MAC12MG. Use only if circuit design permits operation at reduced current capacity.

Q: What is the difference between Standard and Alternistor TRIAC types? A: Standard TRIACs (MAC12MG, BT138-600,127, BTB12-600BRG) require external snubber networks in certain AC applications to suppress dV/dt-induced false triggering. Alternistor variants (Q6012RH5TP, BTB12-600BWRG) incorporate internal snubberless technology, reducing component count and EMI. Both maintain 600V/12A ratings.

Q: Does BT138-600E,127 require different gate drive circuitry than MAC12MG? A: BT138-600E,127 has a maximum gate trigger current of 10 mA versus 35 mA for MAC12MG. This lower gate current requirement enables direct logic-level drive in microcontroller applications. Existing gate drive circuits designed for 35 mA will operate BT138-600E,127 without modification, though with reduced efficiency.

Q: Are all substitutes available in TO-220AB packaging? A: MAC12MG and BT138-600,127 are specified in TO-220AB. Other substitutes use TO-220 or TO-220 Non-Isolated Tab variants. Pin configurations remain compatible for standard through-hole board layouts. Verify PCB pad design for tab isolation requirements.

Q: What is the temperature operating range difference between MAC12MG and BT138-600,127? A: MAC12MG operates -40°C to 125°C; BT138-600,127 operates 0°C to 125°C. If lower temperature operation below 0°C is required, select BTB12-600BRG, BTB12-600BWRG, or BTB12-600CRG, which all support -40°C to 125°C.

Q: Can AVS12CB (Internally Triggered) be used without gate drive circuitry? A: AVS12CB is internally triggered and does not require external gate signal. It is suitable for applications where gate drive generation is not feasible. Verify application requirements before selection, as internal triggering behavior differs from standard gate-driven operation.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitutes maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of MAC12MG.

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