MAC12NG TRIAC 800V 12A Equivalent & Substitute Parts

Part Overview

The MAC12NG is a standard TRIAC thyristor manufactured by Littelfuse Inc., rated for 800V off-state voltage and 12A on-state current in a TO-220AB through-hole package. This component is actively produced and fully compliant with ROHS3 and REACH regulations. Equivalent and substitute parts are identified based on matching or superior electrical characteristics within the same package configuration, enabling direct replacement in AC switching and control applications where the specified voltage and current ratings are required.

Key Parameters

Parameter	MAC12NG Value	Unit
Voltage - Off State	800	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) @ 60Hz	100	A
Operating Temperature Range	-40 to 125	°C
Package / Case	TO-220-3	-
Mounting Type	Through Hole	-
TRIAC Type	Standard	-

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Voltage - Off State: Must equal or exceed 800V
Current - On State (It RMS) Max: Must equal or exceed 12A
Package / Case: Must be TO-220-3
Mounting Type: Must be Through Hole
Operating Temperature: Must support the application range or higher

Secondary Compatibility Factors:

Gate trigger voltage (Vgt) and current (Igt) characteristics determine gate drive circuit compatibility
TRIAC type (Standard, Alternistor, Logic-Sensitive Gate) affects switching behavior and snubber requirements
Non-repetitive surge current (Itsm) indicates transient withstand capability
RoHS and REACH compliance status must be maintained

Substitute Categories Identified:

Direct Equivalents (Standard TRIAC, 800V, 12A): Parts with identical electrical ratings and standard TRIAC architecture
Enhanced Performance (Alternistor/Snubberless, 800V, 12A): Parts with improved gate sensitivity and surge capability
Higher Current Capability (800V, 16A): Parts exceeding the 12A requirement, suitable for applications with margin requirements
Lower Current Variants (800V, 6-8A): Parts with reduced current ratings, not suitable as direct substitutes but listed for reference

Parameter Comparison

Part Number	Manufacturer	TRIAC Type	Voltage (V)	Current (A)	Vgt Max (V)	Igt Max (mA)	Ih Max (mA)	Itsm @ 60Hz (A)	Temp Range (°C)	Package
MAC12NG	Littelfuse Inc.	Standard	800	12	1.5	35	40	100	-40 to 125	TO-220AB
Q8012RH5TP	Littelfuse Inc.	Alternistor - Snubberless	800	12	1.3	50	50	110, 120	-40 to 125	TO-220AB
BT138-800,127	WeEn Semiconductors	Standard	800	12	1.5	35	30	95, 105	-40 to 125	TO-220AB
BT138-800E,127	WeEn Semiconductors	Logic - Sensitive Gate	800	12	1.5	10	30	90, 100	-40 to 125	TO-220AB
BTA312-800C,127	WeEn Semiconductors	Standard	800	12	1.5	35	35	95, 105	-40 to 125	TO-220AB
BTA312-800CT,127	WeEn Semiconductors	Standard	800	12	1.0	35	35	100, 110	-40 to 150	TO-220AB
BTB12-800CWRG	STMicroelectronics	Alternistor - Snubberless	800	12	1.3	35	35	120, 126	-40 to 125	TO-220
T1235T-8T	STMicroelectronics	Alternistor - Snubberless	800	12	1.3	35	40	90, 95	-40 to 150	TO-220
T1635T-8T	STMicroelectronics	Alternistor - Snubberless	800	16	1.3	35	40	120, 126	-40 to 150	TO-220
T635T-8T	STMicroelectronics	Alternistor - Snubberless	800	6	1.3	35	40	45, 47	-40 to 150	TO-220
ACST830-8T	STMicroelectronics	Standard	800	8	1.0	30	30	80, 84	-40 to 125	TO-220

Engineering Selection Recommendations

Direct Substitutes (Electrically and Mechanically Compatible):

The following parts meet or exceed all electrical parameters of the MAC12NG and maintain identical package configuration:

BT138-800,127 (WeEn Semiconductors): Standard TRIAC with matching 800V/12A ratings, identical gate characteristics, and equivalent temperature range. ROHS3 compliant. Suitable for direct replacement in standard AC switching applications.
BTA312-800C,127 (WeEn Semiconductors): Standard TRIAC with matching ratings and slightly lower hold current. ROHS3 compliant. Equivalent performance for general-purpose applications.
BTA312-800CT,127 (WeEn Semiconductors): Standard TRIAC with lower gate trigger voltage (1.0V vs 1.5V) and extended temperature range to 150°C. ROHS3 compliant. Preferred for temperature-critical or low-gate-drive applications.

Enhanced Performance Substitutes (Improved Characteristics):

Q8012RH5TP (Littelfuse Inc.): Alternistor-type TRIAC with identical 800V/12A ratings but improved gate sensitivity (Vgt 1.3V) and higher surge current capability (110-120A). ROHS3 compliant. Suitable where snubberless operation or reduced gate drive is beneficial.
BTB12-800CWRG (STMicroelectronics): Alternistor-type TRIAC with 800V/12A ratings, lower gate trigger voltage (1.3V), and highest surge current (120-126A). ROHS3 compliant. Recommended for applications requiring snubberless design or maximum transient protection.
T1235T-8T (STMicroelectronics): Alternistor-type TRIAC with 800V/12A ratings, extended temperature range to 150°C, and improved surge capability. ROHS3 compliant. Suitable for high-temperature environments.

Higher Current Capability (Margin Applications):

T1635T-8T (STMicroelectronics): Alternistor-type TRIAC rated 800V/16A, exceeding the 12A requirement. Extended temperature range to 150°C and highest surge current (120-126A). ROHS3 compliant. Applicable where design margin or future load growth is required.

Not Recommended as Direct Substitutes:

BT138-800E,127: Logic-Sensitive Gate type with significantly lower gate trigger current (10mA vs 35mA). Requires gate drive circuit redesign.
ACST830-8T: Reduced current rating (8A vs 12A). Insufficient for 12A applications.
T635T-8T: Reduced current rating (6A vs 12A). Insufficient for 12A applications.

Frequently Asked Questions (FAQ)

Q: Can I use BT138-800,127 as a direct replacement for MAC12NG?

A: Yes. Both parts are standard TRIACs with identical 800V/12A ratings, matching gate trigger characteristics (Vgt 1.5V, Igt 35mA), and TO-220AB packaging. No circuit modifications are required.

Q: What is the difference between a Standard TRIAC and an Alternistor?

A: Alternistor TRIACs (such as Q8012RH5TP, BTB12-800CWRG, and T1235T-8T) feature snubberless technology with lower gate trigger voltage and improved surge current capability. Standard TRIACs (MAC12NG, BT138-800,127, BTA312 series) are conventional designs. Both are electrically compatible when ratings match, but Alternistors offer enhanced performance in noise-sensitive or high-transient applications.

Q: Why does BTA312-800CT,127 have a lower gate trigger voltage (1.0V)?

A: Lower gate trigger voltage indicates higher gate sensitivity, requiring less gate drive current to switch the TRIAC. This is a design characteristic of the BTA312-800CT variant and does not affect compatibility. It may reduce gate drive circuit power consumption.

Q: Can I use T1635T-8T (16A) instead of MAC12NG (12A)?

A: Yes, from an electrical standpoint. The T1635T-8T exceeds the 12A requirement and provides additional design margin. However, verify that the application circuit can accommodate the higher current capability and that thermal management is appropriate for the specific design.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The MAC12NG is also ROHS3 compliant. Compliance status is maintained across all recommended substitutes.

Q: What is the significance of the operating temperature range difference?

A: MAC12NG operates from -40°C to 125°C. Some substitutes (BTA312-800CT,127, T1235T-8T, T1635T-8T) extend to 150°C. If your application operates above 125°C, select a substitute with the extended range. For standard -40°C to 125°C applications, all substitutes are suitable.

Q: Does package designation TO-220AB differ from TO-220?

A: Both designations refer to the same three-lead through-hole package with identical pin spacing and mounting. The "AB" suffix is a supplier-specific designation. All listed parts are mechanically compatible in TO-220-3 footprints.

Q: Which substitute offers the best surge current protection?

A: T1635T-8T and BTB12-800CWRG both provide the highest non-repetitive surge current ratings (120-126A at 60Hz), compared to MAC12NG (100A). These are preferred for applications with high inrush current or transient stress.

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