Q2008DH3TP TRIAC Alternistor Equivalent & Substitute Parts

Part Overview

The Q2008DH3TP is a snubberless TRIAC Alternistor manufactured by Littelfuse Inc., rated for 200V off-state voltage and 8A on-state current in a surface mount TO-252 (DPAK) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the same current rating and package configuration while offering higher voltage ratings to support broader application requirements.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Category	Thyristors
Triac Type	Alternistor - Snubberless
Voltage - Off State	200 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	10 mA
Current - Hold (Ih) (Max)	15 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	80A, 85A
Configuration	Single
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the Q2008DH3TP are selected based on strict electrical and mechanical compatibility criteria. The following parameters must remain constant or be compatible across all substitute parts:

Current - On State (It (RMS)) (Max): 8 A
Voltage - Gate Trigger (Vgt) (Max): 1.3 V
Current - Gate Trigger (Igt) (Max): 10 mA
Current - Hold (Ih) (Max): 15 mA
Current - Non Rep. Surge 50, 60Hz (Itsm): 80A, 85A
Configuration: Single
Operating Temperature: -40°C ~ 125°C (TJ)
Mounting Type: Surface Mount
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Triac Type: Alternistor - Snubberless

The primary variable parameter across substitute parts is Voltage - Off State, which increases from 200V in the main part to 400V and 600V in the substitute options. Higher voltage ratings provide enhanced overvoltage capability while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Parameter	Q2008DH3TP (Main)	Q4008DH3TP (Substitute)	Q6008DH3TP (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Voltage - Off State	200 V	400 V	600 V
Current - On State (It (RMS)) (Max)	8 A	8 A	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.3 V
Current - Gate Trigger (Igt) (Max)	10 mA	10 mA	10 mA
Current - Hold (Ih) (Max)	15 mA	15 mA	15 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	80A, 85A	80A, 85A	80A, 85A
Configuration	Single	Single	Single
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63
Triac Type	Alternistor - Snubberless	Alternistor - Snubberless	Alternistor - Snubberless
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

The Q2008DH3TP is obsolete and no longer in active production. Both substitute parts Q4008DH3TP and Q6008DH3TP are active products with current manufacturing support from Littelfuse Inc.

Q4008DH3TP provides a 400V off-state voltage rating and is suitable for applications requiring moderate overvoltage margin above the original 200V specification. This part maintains full electrical and mechanical compatibility with the Q2008DH3TP while offering improved voltage headroom.

Q6008DH3TP provides a 600V off-state voltage rating and is suitable for applications requiring maximum overvoltage protection. This part maintains full electrical and mechanical compatibility with the Q2008DH3TP while offering the highest voltage capability within the substitute family.

Both substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the compliance profile of the original part. Active product status ensures ongoing availability and manufacturing continuity for both options.

Frequently Asked Questions (FAQ)

Q: Can Q4008DH3TP or Q6008DH3TP be used as direct replacements for Q2008DH3TP?

A: Yes. Both substitute parts maintain identical current ratings (8A), gate trigger characteristics (Vgt 1.3V max, Igt 10mA max), hold current (15mA max), surge current ratings (80A/85A), operating temperature range (-40°C to 125°C), and package configuration (TO-252 DPAK). The higher voltage ratings (400V and 600V respectively) are compatible with 200V circuit designs and provide additional overvoltage margin.

Q: What is the difference between Q4008DH3TP and Q6008DH3TP?

A: The primary difference is the off-state voltage rating. Q4008DH3TP is rated for 400V while Q6008DH3TP is rated for 600V. All other electrical parameters and the physical package remain identical. Selection between these two depends on the maximum voltage stress expected in the application circuit.

Q: Are the substitute parts available in the same package as the original Q2008DH3TP?

A: Yes. Both Q4008DH3TP and Q6008DH3TP use the identical TO-252-3 DPAK (2 Leads + Tab) SC-63 package, ensuring mechanical and thermal compatibility with existing PCB layouts and thermal management designs.

Q: Do the substitute parts have the same compliance certifications as Q2008DH3TP?

A: Yes. Both Q4008DH3TP and Q6008DH3TP are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the compliance profile of the original part.

Q: Why is Q2008DH3TP marked as obsolete?

A: The Q2008DH3TP has been discontinued by Littelfuse Inc. and is no longer in active production. The substitute parts Q4008DH3TP and Q6008DH3TP provide equivalent functionality with active manufacturing support and improved voltage ratings.

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