Q8012RH5 TRIAC Alternistor 800V 12A TO-220 Equivalent & Substitute Parts

Part Overview

The Q8012RH5 is a Littelfuse TRIAC Alternistor rated for 800V off-state voltage and 12A on-state current in a TO-220 through-hole package. This snubberless design is discontinued at DiGi Electronics but remains available in inventory (1900 pcs). Equivalent and substitute parts are necessary for applications requiring active component sourcing, design flexibility, or long-term supply chain continuity.

Key Parameters

Parameter	Q8012RH5
Voltage - Off State	800 V
Current - On State (It RMS) Max	12 A
Voltage - Gate Trigger (Vgt) Max	1.3 V
Current - Gate Trigger (Igt) Max	50 mA
Current - Hold (Ih) Max	50 mA
Current - Non Rep. Surge (Itsm)	110A, 120A
Operating Temperature Range	-40°C to 125°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
TRIAC Type	Alternistor - Snubberless
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Parameters:

Voltage - Off State: 800V (exact match required)
Current - On State: 12A minimum (equal or higher acceptable)
Package / Case: TO-220-3 (mechanical compatibility)
Mounting Type: Through Hole (PCB compatibility)
Operating Temperature Range: -40°C to 125°C minimum (thermal envelope)

Secondary Compatibility Factors:

Voltage - Gate Trigger (Vgt): Lower or equal values ensure reliable triggering
Current - Gate Trigger (Igt): Lower or equal values reduce gate drive requirements
Current - Hold (Ih): Lower or equal values reduce holding current demands
TRIAC Type: Standard TRIACs are functionally compatible with Alternistor designs in most applications

Substitutes Identified:

Direct 12A Equivalents (800V, 12A, TO-220):

2N6349AG (Littelfuse, Standard TRIAC, Active)
BTB12-800BW3G (onsemi, Standard TRIAC, Active)
MAC12NG (Littelfuse, Standard TRIAC, Active)
MAC212A10G (onsemi, Standard TRIAC, Active)

Higher Current Alternatives (800V, 15A, TO-220):

MAC15A10G (Littelfuse, Standard TRIAC, Active)
MAC15NG (Littelfuse, Standard TRIAC, Active)

Lower Current Alternatives (800V, 8A, TO-220):

MAC8NG (Littelfuse, Standard TRIAC, Active)
MAC8SNG (Littelfuse, Logic - Sensitive Gate, Active)
MAC228A10G (Littelfuse, Logic - Sensitive Gate, Active)
MAC9NG (Littelfuse, Standard TRIAC, Active)

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State	Current - On State (It RMS) Max	Voltage - Gate Trigger (Vgt) Max	Current - Gate Trigger (Igt) Max	Current - Hold (Ih) Max	Current - Non Rep. Surge (Itsm)	TRIAC Type	Product Status
Q8012RH5	Littelfuse Inc.	800 V	12 A	1.3 V	50 mA	50 mA	110A, 120A	Alternistor - Snubberless	Discontinued
2N6349AG	Littelfuse Inc.	800 V	12 A	2 V	50 mA	40 mA	100A @ 60Hz	Standard	Active
BTB12-800BW3G	onsemi	800 V	12 A	1.1 V	50 mA	50 mA	120A @ 60Hz	Standard	Active
MAC12NG	Littelfuse Inc.	800 V	12 A	1.5 V	35 mA	40 mA	100A @ 60Hz	Standard	Active
MAC212A10G	onsemi	800 V	12 A	2 V	50 mA	50 mA	100A @ 60Hz	Standard	Active
MAC15A10G	Littelfuse Inc.	800 V	15 A	2 V	50 mA	40 mA	150A @ 60Hz	Standard	Active
MAC15NG	Littelfuse Inc.	800 V	15 A	1.5 V	35 mA	40 mA	150A @ 60Hz	Standard	Active
MAC8NG	Littelfuse Inc.	800 V	8 A	1.5 V	35 mA	40 mA	80A @ 60Hz	Standard	Active
MAC8SNG	Littelfuse	800 V	8 A	1.5 V	5 mA	10 mA	70A @ 60Hz	Logic - Sensitive Gate	Active
MAC228A10G	Littelfuse Inc.	800 V	8 A	2 V	5 mA	15 mA	80A @ 60Hz	Logic - Sensitive Gate	Active
MAC9NG	Littelfuse Inc.	800 V	8 A	1.5 V	50 mA	50 mA	80A @ 60Hz	Standard	Active

Engineering Selection Recommendations

For Direct Replacement (12A Current Rating):

BTB12-800BW3G and MAC12NG are the primary equivalents. Both maintain 800V voltage rating, 12A current capacity, and TO-220 packaging. BTB12-800BW3G offers lower gate trigger voltage (1.1V vs. 1.3V) and higher surge current rating (120A). MAC12NG provides lower gate trigger current (35mA vs. 50mA). Both are active products with full RoHS3 compliance.

For Higher Current Applications (15A Rating):

MAC15A10G and MAC15NG support 15A on-state current while maintaining 800V voltage rating. These are suitable for applications requiring additional current margin. MAC15NG features lower gate trigger voltage (1.5V) and gate trigger current (35mA) compared to MAC15A10G (2V, 50mA).

For Lower Current Applications (8A Rating):

MAC8NG, MAC9NG, MAC8SNG, and MAC228A10G are available for designs with reduced current requirements. MAC8SNG and MAC228A10G feature logic-level sensitive gate operation with significantly reduced gate trigger current (5mA), suitable for microcontroller-driven applications. Standard gate versions (MAC8NG, MAC9NG) maintain conventional gate drive requirements.

Compliance and Availability:

All substitute parts are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Inventory availability ranges from 1250 to 9713 units across the substitute options.

Frequently Asked Questions (FAQ)

Q: Can I use a 15A TRIAC as a substitute for the 12A Q8012RH5?

A: Yes. MAC15A10G and MAC15NG maintain the same 800V voltage rating and TO-220 package. Higher current rating provides design margin without affecting circuit operation. Verify thermal management remains adequate for your application.

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

A: The Q8012RH5 is an Alternistor (snubberless) design. Standard TRIAC substitutes (2N6349AG, BTB12-800BW3G, MAC12NG) are functionally compatible in most applications. Snubberless design reduces external component requirements; standard TRIACs may require snubber networks in sensitive circuits.

Q: Can I use an 8A TRIAC if my circuit only draws 8A?

A: Yes, if your application current does not exceed 8A RMS. MAC8NG, MAC9NG, MAC8SNG, and MAC228A10G are suitable. Verify surge current requirements do not exceed the part's Itsm rating (70A to 80A @ 60Hz for 8A parts).

Q: What is the significance of gate trigger voltage (Vgt)?

A: Lower Vgt values require less gate voltage to trigger the TRIAC. BTB12-800BW3G (1.1V) triggers more easily than 2N6349AG (2V). For gate-driven applications, lower Vgt reduces gate drive circuit complexity.

Q: Are sensitive gate TRIACs (MAC8SNG, MAC228A10G) compatible with standard gate drive circuits?

A: Sensitive gate parts require significantly lower gate trigger current (5mA vs. 35-50mA). They are compatible with standard circuits but may trigger unintentionally if gate noise is present. Verify gate circuit design for your application.

Q: Does package type affect substitution?

A: All listed substitutes use TO-220-3 through-hole packaging, ensuring mechanical and thermal compatibility. PCB layout and heatsink mounting remain unchanged.

Q: What is the difference between 100A @ 60Hz and 120A @ 60Hz surge ratings?

A: These represent non-repetitive surge current (Itsm) at 60Hz line frequency. Higher ratings provide greater transient current capacity. BTB12-800BW3G (120A) offers higher surge margin than 2N6349AG (100A).

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