Q2008VH4TP TRIAC Alternistor Equivalent & Substitute Parts

Part Overview

The Q2008VH4TP is a snubberless TRIAC Alternistor manufactured by Littelfuse Inc., rated for 200 V off-state voltage and 8 A on-state current in a TO-251 through-hole 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 alternative voltage ratings and active product status.

Substiute Parts

Q2008VH4TP

Littelfuse Inc.In Stock: 1117Q2008VH4TP Datasheet

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Q4008VH4TP

Littelfuse Inc.In Stock: 794Q4008VH4TP Datasheet

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Q6008VH4TP

Littelfuse Inc.In Stock: 35259Q6008VH4TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Q2008VH4TP are qualified based on the following criteria:

Maintained Parameters (Substitution Basis):

• 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: Through Hole
• Package / Case: TO-251-3 Short Leads, IPak, TO-251AA
• Configuration: Single
• Triac Type: Alternistor - Snubberless
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Variable Parameter (Differentiation):

• Voltage - Off State: 400 V (Q4008VH4TP) and 600 V (Q6008VH4TP) versus 200 V (Q2008VH4TP)

The substitute parts Q4008VH4TP and Q6008VH4TP are direct functional equivalents with higher voltage ratings. Both maintain identical current specifications, gate trigger characteristics, thermal operating range, and package configuration. Both substitute parts carry active product status and full compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Q4008VH4TP (400 V Rating): This substitute provides a 2× voltage margin over the original Q2008VH4TP while maintaining identical current and gate trigger specifications. Active product status ensures long-term availability and supply chain continuity. ROHS3 compliance and unlimited moisture sensitivity rating match the original part's environmental qualifications.

Q6008VH4TP (600 V Rating): This substitute provides a 3× voltage margin over the original Q2008VH4TP with identical electrical performance in current and gate trigger characteristics. This part carries the highest inventory availability (35,200 pcs) among all options and maintains full compliance certifications. Active product status guarantees sustained manufacturability.

Both substitute parts are manufactured by the same supplier (Littelfuse Inc.) and share identical package geometry, thermal operating range, and regulatory compliance status with the obsolete Q2008VH4TP.

Frequently Asked Questions (FAQ)

Q: Can Q4008VH4TP or Q6008VH4TP be used as direct replacements for Q2008VH4TP?

A: Yes. Both substitute parts maintain identical on-state current (8 A), gate trigger voltage (1.3 V maximum), gate trigger current (35 mA maximum), hold current (35 mA maximum), operating temperature range (-40°C to 125°C), and TO-251 package configuration. The higher voltage ratings (400 V and 600 V respectively) are compatible with applications designed for 200 V operation.

Q: What is the difference between Q4008VH4TP and Q6008VH4TP?

A: The primary difference is off-state voltage rating: Q4008VH4TP is rated for 400 V while Q6008VH4TP is rated for 600 V. All other electrical parameters, package configuration, and compliance certifications are identical.

Q: Why is the Q2008VH4TP classified as obsolete?

A: The Q2008VH4TP has been discontinued by the manufacturer. Q4008VH4TP and Q6008VH4TP are active products that provide equivalent functionality with higher voltage ratings and assured long-term availability.

Q: Are there any package or mounting differences between these parts?

A: No. All three parts use the TO-251-3 Short Leads package (IPak, TO-251AA) with through-hole mounting. PCB layout and thermal management considerations remain identical.

Q: Do the substitute parts have the same compliance certifications?

A: Yes. Q4008VH4TP and Q6008VH4TP are both ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original Q2008VH4TP specifications.