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Q8006DH4TP TRIAC Alternistor 800V 6A Equivalent & Substitute Parts
Part Overview
The Q8006DH4TP is an 800V 6A TRIAC Alternistor (snubberless) manufactured by Littelfuse Inc. in Surface Mount TO-252 (DPAK) packaging. This component is classified as Active status and is RoHS3 compliant. Substitute parts are necessary when the primary part is unavailable, when alternative packaging formats are required, or when application requirements permit operation at different current ratings within the same voltage class and package family.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | Q8006DH4TP |
| Manufacturer | Littelfuse Inc. |
| Category | Thyristors |
| Triac Type | Alternistor - Snubberless |
| Voltage - Off State | 800 V |
| Current - On State (It RMS) Max | 6 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 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the Q8006DH4TP is determined by the following critical parameters:
- Voltage Rating (Off State): Must be 800 V minimum
- Package Type: Must be TO-252-3 (DPAK) Surface Mount
- Triac Type Classification: Alternistor - Snubberless or Standard types
- Current Rating (On State): Acceptable range 4 A to 8 A depending on application margin requirements
- Gate Trigger Parameters: Vgt ≤ 1.3 V and Igt ≤ 35 mA
- Operating Temperature Range: -40°C ~ 125°C (TJ)
- Compliance: RoHS3 compliant, MSL 1
Substitute parts are grouped into three categories based on current rating: 4A rated devices (lower current margin), 6A rated devices (equivalent current), and 8A rated devices (higher current capacity). All substitutes maintain the 800V voltage class, TO-252 package, and temperature operating range.
Parameter Comparison
| Part Number | Manufacturer | Triac Type | Voltage (V) | Current (A) | Vgt Max (V) | Igt Max (mA) | Ih Max (mA) | Package | Temp Range (°C) |
|---|---|---|---|---|---|---|---|---|---|
| Q8006DH4TP | Littelfuse Inc. | Alternistor - Snubberless | 800 | 6 | 1.3 | 35 | 35 | TO-252 (DPAK) | -40 ~ 125 |
| MAC4DCNT4G | Littelfuse Inc. | Standard | 800 | 4 | 1.3 | 35 | 35 | TO-252 (DPAK) | -40 ~ 125 |
| ACST210-8B | STMicroelectronics | Logic - Sensitive Gate | 800 | 2 | 1.1 | 10 | 10 | TO-252 (DPAK) | -40 ~ 125 |
| ACST435-8B | STMicroelectronics | Standard | 800 | 4 | 1.1 | 35 | 25 | TO-252 (DPAK) | -40 ~ 125 |
| ACST435-8BTR | STMicroelectronics | Standard | 800 | 4 | 1.1 | 35 | 25 | TO-252 (DPAK) | -40 ~ 125 |
| T405-800B-TR | STMicroelectronics | Logic - Sensitive Gate | 800 | 4 | 1.3 | 5 | 10 | TO-252 (DPAK) | -40 ~ 125 |
| T435-800B-TR | STMicroelectronics | Alternistor - Snubberless | 800 | 4 | 1.3 | 35 | 35 | TO-252 (DPAK) | -40 ~ 125 |
| T810-800B-TR | STMicroelectronics | Logic - Sensitive Gate | 800 | 8 | 1.3 | 10 | 15 | TO-252 (DPAK) | -40 ~ 125 |
| T835-800B-TR | STMicroelectronics | Alternistor - Snubberless | 800 | 8 | 1.3 | 35 | 35 | TO-252 (DPAK) | -40 ~ 125 |
Engineering Selection Recommendations
Direct Equivalents (Alternistor - Snubberless Type, 6A Rating)
No exact 6A Alternistor - Snubberless substitute from the provided list maintains the identical current rating. The Q8006DH4TP remains the primary selection for applications requiring 6A snubberless operation.
Closest Functional Substitutes
T835-800B-TR (STMicroelectronics, 8A Alternistor - Snubberless) provides the nearest functional equivalent with higher current capacity. This part maintains identical gate trigger parameters (Vgt 1.3V, Igt 35mA, Ih 35mA) and snubberless topology. Selection is appropriate when higher current margin is acceptable and component availability is critical.
T435-800B-TR (STMicroelectronics, 4A Alternistor - Snubberless) maintains snubberless topology with matching gate parameters but reduced current rating. This part is suitable only for applications with confirmed 4A maximum current requirement.
Standard TRIAC Alternatives (Non-Snubberless)
MAC4DCNT4G (Littelfuse Inc., 4A Standard) and ACST435-8B/ACST435-8BTR (STMicroelectronics, 4A Standard) provide standard TRIAC operation at 800V. These parts are suitable for applications where snubberless topology is not required. All maintain RoHS3 compliance and -40°C to 125°C operating range.
Sensitive Gate Alternatives
ACST210-8B (2A Logic - Sensitive Gate) and T405-800B-TR (4A Logic - Sensitive Gate) feature reduced gate trigger current (5-10mA) compared to the main part (35mA). T810-800B-TR (8A Logic - Sensitive Gate) provides higher current capacity with sensitive gate characteristics. These parts are applicable only when low gate drive current is a system requirement.
All substitute parts are Active status and RoHS3 compliant, matching the primary part's regulatory standing.
Frequently Asked Questions (FAQ)
Q: Can I use a 4A rated TRIAC as a substitute for the 6A Q8006DH4TP?
A: A 4A rated part operates within reduced current margin. Substitution is permissible only if circuit analysis confirms maximum load current does not exceed 4A RMS. The 4A parts (MAC4DCNT4G, ACST435-8B, ACST435-8BTR, T435-800B-TR) maintain 800V voltage rating and TO-252 package compatibility.
Q: What is the difference between Alternistor - Snubberless and Standard TRIAC types?
A: Alternistor - Snubberless TRIACs (Q8006DH4TP, T435-800B-TR, T835-800B-TR) are optimized for operation without external snubber networks, reducing component count. Standard TRIACs (MAC4DCNT4G, ACST435-8B, ACST435-8BTR) may require snubber circuits in certain applications. Selection depends on circuit design requirements.
Q: Are all substitute parts available in the same packaging?
A: All listed substitutes use TO-252-3 (DPAK) Surface Mount packaging. Packaging format variations exist: Q8006DH4TP is supplied in Tube; MAC4DCNT4G in Tape & Reel (TR); ACST435-8B in Tube; ACST435-8BTR, T405-800B-TR, T435-800B-TR, T810-800B-TR, and T835-800B-TR in Cut Tape (CT) & Digi-Reel®. Packaging format does not affect electrical compatibility.
Q: Can I use an 8A rated TRIAC instead of the 6A Q8006DH4TP?
A: Yes. T835-800B-TR (8A Alternistor - Snubberless) and T810-800B-TR (8A Logic - Sensitive Gate) provide higher current capacity while maintaining 800V voltage rating and TO-252 package. These parts are suitable for direct substitution with increased current margin. Gate trigger parameters differ: T835-800B-TR matches the original (Vgt 1.3V, Igt 35mA), while T810-800B-TR has reduced gate current (Igt 10mA).
Q: What is the significance of gate trigger voltage (Vgt) and gate trigger current (Igt)?
A: Vgt (maximum 1.3V for Q8006DH4TP) defines the gate voltage threshold required to trigger the TRIAC. Igt (maximum 35mA) specifies the gate current needed for reliable triggering. Lower values (ACST210-8B: Igt 10mA, T405-800B-TR: Igt 5mA) indicate sensitive gate operation requiring less drive current. Selection depends on gate drive circuit capability.
Q: Are all substitutes RoHS3 compliant?
A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited moisture sensitivity level), matching the Q8006DH4TP regulatory status.
Q: What is the operating temperature range for these parts?
A: All parts operate across -40°C to 125°C junction temperature (TJ), providing identical thermal operating range.
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