Q2008DH4TP TRIAC Alternistor Equivalent & Substitute Parts

Part Overview

The Q2008DH4TP is a snubberless TRIAC Alternistor manufactured by Littelfuse Inc., rated for 200 V off-state voltage and 8 A on-state current in a surface mount TO-252 (DPAK) package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the same current rating and package configuration while offering higher voltage ratings or active product status.

Substiute Parts

Q2008DH4TP

Littelfuse Inc.In Stock: 1048Q2008DH4TP Datasheet

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Q4008DH4TP

Littelfuse Inc.In Stock: 904Q4008DH4TP Datasheet

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Q6008DH4TP

Littelfuse Inc.In Stock: 1226Q6008DH4TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Q2008DH4TP are selected based on the following criteria:

Mandatory Matching Parameters:

• Triac Type: Alternistor - Snubberless
• 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-252-3, DPAK (2 Leads + Tab), SC-63

Variable Parameter (Allows Substitution):

• Voltage - Off State: Higher voltage ratings (400 V, 600 V) are acceptable substitutes for 200 V applications, provided the circuit design accommodates the higher voltage rating.

The Q4008DH4TP and Q6008DH4TP maintain all mandatory electrical and mechanical parameters while offering increased off-state voltage ratings. Both substitute parts are manufactured by Littelfuse Inc. and carry active product status.

Parameter Comparison

Engineering Selection Recommendations

Q4008DH4TP (400 V Rating): This substitute part is suitable for applications where the Q2008DH4TP is no longer available. The Q4008DH4TP carries active product status and maintains full compliance with ROHS3 standards. The 400 V off-state voltage rating provides increased margin over the original 200 V specification while preserving all gate trigger and current characteristics.

Q6008DH4TP (600 V Rating): This substitute part offers the highest voltage rating among available alternatives. The Q6008DH4TP is actively manufactured and fully ROHS3 compliant. The 600 V off-state voltage rating provides maximum voltage margin for applications requiring enhanced overvoltage protection while maintaining identical gate trigger and current specifications.

Both substitute parts are manufactured by Littelfuse Inc. and are available in active production status, ensuring long-term supply continuity compared to the obsolete Q2008DH4TP.

Frequently Asked Questions (FAQ)

Q: Can Q4008DH4TP or Q6008DH4TP be used as direct replacements for Q2008DH4TP?

A: Yes, both parts are direct substitutes. They maintain identical current ratings (8 A), gate trigger characteristics (1.3 V maximum), and package configuration (TO-252 DPAK). The higher voltage ratings (400 V and 600 V respectively) are compatible with 200 V applications.

Q: What is the difference between the Q4008DH4TP and Q6008DH4TP?

A: The primary difference is the off-state voltage rating. The Q4008DH4TP is rated for 400 V, while the Q6008DH4TP is rated for 600 V. All other electrical parameters and the package configuration are identical.

Q: Are there any package differences between these parts?

A: No. All three parts use the same TO-252-3 DPAK (2 Leads + Tab) SC-63 package configuration, ensuring identical PCB footprint and mounting requirements.

Q: Why is the Q2008DH4TP obsolete?

A: The Q2008DH4TP is classified as obsolete by the manufacturer. The Q4008DH4TP and Q6008DH4TP are the active alternatives that provide equivalent functionality with higher voltage ratings.

Q: Do the substitute parts have the same operating temperature range?

A: Yes. All three parts operate across the same temperature range of -40°C to 125°C (TJ), ensuring thermal compatibility in equivalent applications.

Q: Are all parts RoHS compliant?

A: Yes. The Q2008DH4TP, Q4008DH4TP, and Q6008DH4TP are all ROHS3 compliant with MSL rating of 1 (Unlimited).