ACTT8-800CTNQ TRIAC 800V 8A Equivalent & Substitute Parts

Part Overview

The ACTT8-800CTNQ is a standard TRIAC thyristor manufactured by WeEn Semiconductors, rated for 800V off-state voltage and 8A on-state current in a TO-220AB through-hole package. This component is in active product status with 804 units currently in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical compatibility, and functional performance within the 800V TRIAC category. Substitutes enable design flexibility, supply chain alternatives, and performance optimization for specific application requirements.

Key Parameters

Parameter	ACTT8-800CTNQ
Manufacturer	WeEn Semiconductors
Voltage - Off State	800 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	1 V
Current - Gate Trigger (Igt) (Max)	35 mA
Current - Hold (Ih) (Max)	40 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	80A, 88A
Triac Type	Standard
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature	150°C (TJ)
Configuration	Single
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the ACTT8-800CTNQ is based on the following critical parameters:

Voltage Rating: All substitutes maintain 800V off-state voltage to ensure equivalent circuit protection and isolation capability.
Current Rating: Substitutes range from 6A to 12A on-state current. Parts rated at 8A or higher provide direct functional equivalence. Parts rated below 8A (6A) represent downrated alternatives suitable only for reduced current applications.
Gate Trigger Voltage (Vgt): Acceptable range is 1.0V to 1.5V maximum, ensuring compatible gate drive requirements.
Gate Trigger Current (Igt): Maximum 35mA to 50mA maintains compatibility with standard gate drive circuits.
Package: All substitutes use TO-220-3 through-hole package with compatible pinout and thermal characteristics.
Triac Type: Both Standard and Alternistor (Snubberless) types are included. Alternistor types offer enhanced EMI performance and reduced snubber requirements.
Operating Temperature: Substitutes rated to -40°C to 125°C or -40°C to 150°C are acceptable for most industrial applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State	Current - On State (Max)	Vgt (Max)	Igt (Max)	Ih (Max)	Itsm (50/60Hz)	Triac Type	Operating Temp	Inventory
ACTT8-800CTNQ	WeEn Semiconductors	800 V	8 A	1 V	35 mA	40 mA	80A, 88A	Standard	150°C	804 Pcs
MAC8NG	Littelfuse Inc.	800 V	8 A	1.5 V	35 mA	40 mA	80A @ 60Hz	Standard	-40°C ~ 125°C	1455 Pcs
Q8008RH4TP	Littelfuse Inc.	800 V	8 A	1.3 V	35 mA	35 mA	83A, 100A	Alternistor - Snubberless	-40°C ~ 125°C	2813 Pcs
Q8006RH4TP	Littelfuse Inc.	800 V	6 A	1.3 V	35 mA	35 mA	80A, 85A	Alternistor - Snubberless	-40°C ~ 125°C	1722 Pcs
BTA10-800CWRG	STMicroelectronics	800 V	10 A	1.3 V	35 mA	35 mA	100A, 105A	Alternistor - Snubberless	-40°C ~ 125°C	1500 Pcs
MAC12NG	Littelfuse Inc.	800 V	12 A	1.5 V	35 mA	40 mA	100A @ 60Hz	Standard	-40°C ~ 125°C	1700 Pcs
2N6349AG	Littelfuse Inc.	800 V	12 A	2 V	50 mA	40 mA	100A @ 60Hz	Standard	-40°C ~ 125°C	4700 Pcs
T1235T-8T	STMicroelectronics	800 V	12 A	1.3 V	35 mA	40 mA	90A, 95A	Alternistor - Snubberless	-40°C ~ 150°C	7373 Pcs

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes)

MAC8NG and Q8008RH4TP are the primary substitutes for ACTT8-800CTNQ. Both maintain 800V voltage rating and 8A current rating. MAC8NG is a standard TRIAC with identical current specifications and gate trigger current. Q8008RH4TP is an Alternistor-type TRIAC offering improved EMI performance and higher surge current capability (83A, 100A vs. 80A, 88A). Both are RoHS3 compliant and REACH unaffected. Q8008RH4TP provides superior thermal and EMI characteristics with extended temperature range support to -40°C.

Uprated Alternatives (Higher Current Capacity)

BTA10-800CWRG (10A) and MAC12NG (12A) provide increased current capacity while maintaining 800V voltage rating. These are suitable for applications requiring higher current margins or future design scaling. T1235T-8T (12A Alternistor) offers the highest current rating with extended operating temperature to 150°C, matching the original part's maximum temperature specification. All uprated alternatives are RoHS3 compliant.

Downrated Alternative (Reduced Current Capacity)

Q8006RH4TP (6A) is a downrated Alternistor substitute suitable only for applications with maximum current requirements below 6A. This part is not recommended as a direct replacement for 8A-rated designs.

Compliance & Availability

All recommended substitutes carry active product status, RoHS3 compliance, and REACH unaffected designation. Inventory availability ranges from 1455 to 7373 units, providing supply chain flexibility. T1235T-8T offers the highest inventory level (7373 Pcs) and extended temperature rating to 150°C.

Frequently Asked Questions (FAQ)

Q: Can MAC8NG directly replace ACTT8-800CTNQ?

A: Yes. MAC8NG maintains identical 800V voltage and 8A current ratings with compatible gate trigger specifications (1.5V vs. 1V maximum). Both are standard TRIAC types in TO-220-3 packages. The primary difference is operating temperature range: MAC8NG is rated -40°C to 125°C versus ACTT8-800CTNQ at 150°C maximum.

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

A: Alternistor (Snubberless) TRIACs incorporate internal snubber networks to reduce EMI and eliminate the need for external snubber circuits. Standard TRIACs require external snubber components in noise-sensitive applications. Alternistor types (Q8008RH4TP, BTA10-800CWRG, T1235T-8T) offer improved EMI performance and higher surge current ratings.

Q: Can I use a 12A TRIAC in place of an 8A TRIAC?

A: Yes, uprated TRIACs (MAC12NG, 2N6349AG, T1235T-8T) are functionally compatible as direct substitutes. Higher current ratings provide design margin and thermal headroom. Verify that gate drive circuits and PCB thermal design accommodate the substitute part's specifications.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance and REACH unaffected designation, meeting current environmental and regulatory requirements.

Q: What is the significance of Gate Trigger Voltage (Vgt)?

A: Vgt determines the gate voltage threshold required to trigger the TRIAC. ACTT8-800CTNQ specifies 1V maximum; substitutes range from 1V to 2V maximum. Lower Vgt values (1V to 1.3V) require less gate drive power and are preferred for low-power gate circuits. Higher Vgt values (1.5V to 2V) are acceptable in standard gate drive designs but may require circuit verification.

Q: Which substitute offers the best thermal performance?

A: T1235T-8T (STMicroelectronics Alternistor) provides the highest operating temperature rating (-40°C to 150°C), matching the original part's maximum specification. This part also offers 12A current capacity and Alternistor technology for reduced EMI.

Q: Is package compatibility guaranteed across all substitutes?

A: Yes. All substitutes use TO-220-3 through-hole package with identical pinout and mechanical dimensions. PCB footprints and thermal interface designs are directly compatible.

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