Q6008NH4TP TRIAC Alternistor 600V 8A Equivalent & Substitute Parts

Part Overview

The Q6008NH4TP is a Littelfuse TRIAC Alternistor rated for 600V off-state voltage and 8A on-state current in a surface mount TO-263 (D2PAK) package. This snubberless TRIAC is designed for AC switching applications requiring low gate trigger voltage and current characteristics. The part is active and in production with RoHS3 compliance. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and thermal operating range to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Q6008NH4TP
Voltage - Off State	600 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
Current - Non Rep. Surge (50/60Hz)	83A / 100A
Operating Temperature Range	-40°C to 125°C (TJ)
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)
Mounting Type	Surface Mount
TRIAC Type	Alternistor - Snubberless
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the Q6008NH4TP are grouped based on the following substitution criteria:

Primary Substitution Parameters:

Voltage - Off State: 600V (mandatory match)
Package / Case: TO-263-3, D2PAK (mandatory match for PCB compatibility)
Mounting Type: Surface Mount (mandatory match)
TRIAC Type: Alternistor - Snubberless (functional equivalence)
Configuration: Single (mandatory match)

Allowable Variations:

Current - On State (It RMS): Equal to or greater than 8A
Voltage - Gate Trigger (Vgt): Up to 1.3V maximum
Current - Gate Trigger (Igt): Up to 35mA maximum
Current - Hold (Ih): Up to 35mA maximum
Operating Temperature Range: -40°C minimum to 125°C minimum (extended range acceptable)
RoHS and MSL compliance maintained

Substitutes are organized by on-state current rating, with higher current ratings suitable for applications requiring additional margin or higher load capacity.

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)	Operating Temperature	Package	TRIAC Type
Q6008NH4TP	Littelfuse Inc.	600 V	8 A	1.3 V	35 mA	35 mA	-40°C to 125°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1010H-6G-TR	STMicroelectronics	600 V	10 A	1 V	10 mA	25 mA	-40°C to 150°C	TO-263-3, D2PAK	Logic - Sensitive Gate
T1035H-6G-TR	STMicroelectronics	600 V	10 A	1 V	35 mA	35 mA	-40°C to 150°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1235-600G	STMicroelectronics	600 V	12 A	1.3 V	35 mA	35 mA	-40°C to 125°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1235-600G-TR	STMicroelectronics	600 V	12 A	1.3 V	35 mA	35 mA	-40°C to 125°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1235H-6G	STMicroelectronics	600 V	12 A	1 V	35 mA	35 mA	-40°C to 150°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1235H-6G-TR	STMicroelectronics	600 V	12 A	1 V	35 mA	35 mA	-40°C to 150°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1250-600G-TR	STMicroelectronics	600 V	12 A	1.3 V	50 mA	50 mA	-40°C to 125°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1635-600G	STMicroelectronics	600 V	16 A	1.3 V	35 mA	35 mA	-40°C to 125°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1635-600G-TR	STMicroelectronics	600 V	16 A	1.3 V	35 mA	35 mA	-40°C to 125°C	TO-263-3, D2PAK	Alternistor - Snubberless
T1635H-6G	STMicroelectronics	600 V	16 A	1 V	35 mA	35 mA	-40°C to 150°C	TO-263-3, D2PAK	Alternistor - Snubberless

Engineering Selection Recommendations

All listed substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage conditions.

For direct functional replacement with identical electrical characteristics: T1035H-6G-TR provides the closest match with 10A on-state current, 1V gate trigger voltage, and extended operating temperature range to 150°C. This part is suitable where higher current capacity and improved temperature performance are acceptable.

For applications requiring higher current capacity: T1235-600G, T1235-600G-TR, T1235H-6G, and T1235H-6G-TR rated at 12A on-state current provide increased load handling capability while maintaining the same 600V voltage rating and D2PAK package. T1235H variants offer extended temperature range to 150°C.

For maximum current capacity: T1635-600G, T1635-600G-TR, and T1635H-6G rated at 16A on-state current are suitable for applications requiring the highest current handling in the 600V D2PAK family. T1635H-6G provides extended temperature range to 150°C.

Packaging considerations: Parts designated with "-TR" suffix are supplied in Cut Tape (CT) & Digi-Reel® format. Parts without suffix are supplied in Tube packaging. Both packaging formats are compatible with standard pick-and-place assembly equipment.

Frequently Asked Questions (FAQ)

Q: Can T1010H-6G-TR replace Q6008NH4TP directly? A: T1010H-6G-TR is electrically compatible as a substitute. It provides 10A on-state current (exceeding the 8A requirement), 600V voltage rating, and D2PAK package matching. However, it is classified as Logic - Sensitive Gate TRIAC rather than Alternistor - Snubberless. Gate trigger current is reduced to 10mA and hold current to 25mA. Verify circuit gate drive requirements before substitution.

Q: What is the difference between Alternistor - Snubberless and Logic - Sensitive Gate TRIAC types? A: Both are TRIAC devices rated for 600V operation in D2PAK packages. Alternistor - Snubberless types are optimized for applications without external snubber networks. Logic - Sensitive Gate types feature lower gate trigger current requirements. Selection depends on circuit design and gate drive capabilities.

Q: Are T1235 and T1635 series parts suitable for Q6008NH4TP applications? A: Yes. T1235 series (12A) and T1635 series (16A) maintain 600V voltage rating, D2PAK package, and Alternistor - Snubberless classification. Higher current ratings provide design margin for applications with variable load conditions. Verify thermal management and PCB layout accommodate the higher current capability.

Q: What is the significance of the "-TR" suffix in part numbers? A: The "-TR" suffix indicates Cut Tape (CT) & Digi-Reel® packaging format, suitable for automated assembly lines. Parts without this suffix are supplied in Tube packaging. Both formats contain identical components; packaging selection depends on assembly process requirements.

Q: Do all substitute parts meet the same compliance standards as Q6008NH4TP? A: Yes. All listed substitutes are RoHS3 compliant and carry MSL Level 1 (Unlimited) rating. REACH status is Unaffected for all parts. ECCN classification is EAR99 for all parts.

Q: Can I use T1235H-6G-TR instead of T1235-600G? A: Yes. Both parts are identical except for packaging format (Digi-Reel® vs. Tube) and gate trigger voltage specification (1V vs. 1.3V maximum). T1235H-6G-TR offers lower gate trigger voltage and extended operating temperature to 150°C, making it suitable for wider temperature range applications.

Q: What thermal considerations apply when upgrading from 8A to 12A or 16A rated parts? A: Higher current-rated parts generate proportionally more heat at equivalent load currents. Verify PCB thermal design, copper area, and heat dissipation capability accommodate the selected part's power dissipation characteristics. Consult device datasheets for thermal resistance specifications.

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