Q8008NH4TP TRIAC Equivalent & Substitute Parts

Part Overview

The Q8008NH4TP is a Littelfuse TRIAC Alternistor (Snubberless) rated for 800V off-state voltage and 8A on-state current in a Surface Mount TO-263 (D2PAK) package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific requirements within the allowed parameter ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	Q8008NH4TP
Manufacturer	Littelfuse
Category	Thyristors
Triac Type	Alternistor - Snubberless
Voltage - Off State	800 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	35 mA
Current - Hold (Ih) (Max)	35 mA
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the Q8008NH4TP is determined by the following criteria:

Mandatory Compatibility Parameters:

Voltage - Off State: 800 V (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: TO-263-3, D2PAK (exact match required)
Operating Temperature Range: -40°C ~ 125°C (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

Allowable Variation Parameters:

Current - On State (It (RMS)) (Max): Equal to or greater than 8 A
Voltage - Gate Trigger (Vgt) (Max): Equal to or less than 1.3 V
Current - Gate Trigger (Igt) (Max): Equal to or less than 35 mA
Current - Hold (Ih) (Max): Equal to or less than 35 mA
Triac Type: Alternistor - Snubberless or Logic - Sensitive Gate (both acceptable for 800V applications)

Substitute parts meeting these criteria are listed below.

Parameter Comparison

Parameter	Q8008NH4TP (Main)	ACST610-8G	ACST610-8GTR	T1210-800G-TR	T1235-800G-TR	T2535-800G
Manufacturer	Littelfuse	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Triac Type	Alternistor - Snubberless	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate	Alternistor - Snubberless	Alternistor - Snubberless
Voltage - Off State	800 V	800 V	800 V	800 V	800 V	800 V
Current - On State (It (RMS)) (Max)	8 A	6 A	6 A	12 A	12 A	25 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1 V	1 V	1.3 V	1.3 V	1.3 V
Current - Gate Trigger (Igt) (Max)	35 mA	10 mA	10 mA	10 mA	35 mA	35 mA
Current - Hold (Ih) (Max)	35 mA	25 mA	25 mA	15 mA	35 mA	50 mA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active
Packaging Option	Tube	Tube	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tube

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory and supply chain continuity with the Q8008NH4TP.

ACST610-8G and ACST610-8GTR: These STMicroelectronics Logic - Sensitive Gate TRIACs operate at 800V with 6A maximum on-state current. The 6A rating is below the Q8008NH4TP specification of 8A. These parts are suitable only for applications where the actual load current does not exceed 6A. Gate trigger voltage is 1V (lower than 1.3V), and gate trigger current is 10mA (lower than 35mA), indicating enhanced gate sensitivity. ACST610-8GTR is supplied in Cut Tape & Digi-Reel packaging, while ACST610-8G is supplied in Tube packaging.

T1210-800G-TR: This STMicroelectronics Logic - Sensitive Gate TRIAC operates at 800V with 12A maximum on-state current, exceeding the Q8008NH4TP specification. Gate trigger voltage matches at 1.3V. Gate trigger current is 10mA (lower than 35mA), and hold current is 15mA (lower than 35mA). This part is suitable for applications requiring higher current capacity. Supplied in Cut Tape & Digi-Reel packaging.

T1235-800G-TR: This STMicroelectronics Alternistor - Snubberless TRIAC matches the Q8008NH4TP triac type and operates at 800V with 12A maximum on-state current. All gate parameters match the main part specification (Vgt 1.3V, Igt 35mA, Ih 35mA). This part provides direct functional equivalence with higher current capacity. Supplied in Cut Tape & Digi-Reel packaging.

T2535-800G: This STMicroelectronics Alternistor - Snubberless TRIAC matches the Q8008NH4TP triac type and operates at 800V with 25A maximum on-state current. Gate trigger voltage and current match the main part specification (Vgt 1.3V, Igt 35mA). Hold current is 50mA (higher than 35mA). This part is suitable for high-current applications. Supplied in Tube packaging.

Frequently Asked Questions (FAQ)

Q: Can ACST610-8G or ACST610-8GTR be used as direct replacements for Q8008NH4TP?

A: These parts are compatible only if the application load current does not exceed 6A. The Q8008NH4TP is rated for 8A, so these substitutes are suitable only for lower-current applications. Both parts feature Logic - Sensitive Gate architecture with lower gate trigger requirements (1V vs. 1.3V, 10mA vs. 35mA).

Q: What is the difference between T1235-800G-TR and T2535-800G?

A: Both are STMicroelectronics Alternistor - Snubberless TRIACs matching the Q8008NH4TP triac type. T1235-800G-TR is rated for 12A on-state current and is supplied in Cut Tape & Digi-Reel packaging. T2535-800G is rated for 25A on-state current and is supplied in Tube packaging. Selection depends on required current capacity and packaging requirements.

Q: Are all substitute parts in the same TO-263 D2PAK package?

A: Yes. All substitute parts use the TO-263-3 D2PAK (2 Leads + Tab) package, ensuring mechanical and thermal compatibility with the Q8008NH4TP in PCB layouts and thermal management designs.

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

A: Both types operate at 800V in this product category. Logic - Sensitive Gate TRIACs (ACST610 and T1210 series) feature lower gate trigger requirements, making them suitable for logic-level gate drive circuits. Alternistor - Snubberless TRIACs (Q8008, T1235, and T2535 series) are optimized for snubberless operation, reducing external component requirements in AC switching applications.

Q: Can T1210-800G-TR replace Q8008NH4TP in all applications?

A: T1210-800G-TR is electrically compatible with higher current capacity (12A vs. 8A) and matching gate trigger voltage (1.3V). However, it uses Logic - Sensitive Gate architecture rather than Alternistor - Snubberless. Compatibility depends on whether the application circuit is designed for sensitive-gate triggering characteristics.

Q: What packaging options are available for these substitute parts?

A: ACST610-8G and T2535-800G are supplied in Tube packaging. ACST610-8GTR, T1210-800G-TR, and T1235-800G-TR are supplied in Cut Tape (CT) & Digi-Reel® packaging. Packaging selection affects handling, storage, and automated assembly processes.

Q: Are all parts RoHS3 compliant?

A: Yes. The Q8008NH4TP and all listed substitute parts are RoHS3 compliant, ensuring regulatory compliance for applications subject to RoHS directives.

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