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Q8025R6 TRIAC Alternistor 800V 25A TO-220 Equivalent & Substitute Parts
Part Overview
The Q8025R6 is a Littelfuse TRIAC Alternistor (Snubberless) rated for 800V off-state voltage and 25A on-state current in a TO-220-3 through-hole package. This component is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. The Alternistor topology provides snubberless operation, reducing external component requirements in AC switching applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Off State | 800 V |
| Current - On State (It RMS Max) | 25 A |
| Voltage - Gate Trigger (Vgt Max) | 1.3 V |
| Current - Gate Trigger (Igt Max) | 80 mA |
| Current - Hold (Ih Max) | 100 mA |
| Current - Non Rep. Surge (50/60Hz) | 208A / 250A |
| Operating Temperature Range | -40°C to 125°C |
| Package / Case | TO-220-3 |
| Triac Type | Alternistor - Snubberless |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the Q8025R6 is determined by the following critical parameters:
- Voltage Rating: 800V off-state voltage is mandatory for direct substitution
- Current Rating: 25A on-state current (RMS) is the primary load-handling specification
- Triac Type: Alternistor (Snubberless) topology preferred to maintain snubberless operation characteristics
- Package: TO-220-3 through-hole configuration required for mechanical compatibility
- Gate Trigger Characteristics: Vgt and Igt parameters must remain within acceptable ranges for gate drive circuit compatibility
- Temperature Range: Operating range of -40°C to 125°C preferred for thermal consistency
- Compliance: ROHS3 compliance maintained across substitutes
Substitute parts are grouped into two categories:
Category A - Direct Alternistor Substitutes (Preferred): Parts maintaining Alternistor topology with 800V/25A ratings. These preserve snubberless operation and gate characteristics closest to the original design.
Category B - Standard TRIAC Substitutes: Parts with 800V rating and equal or higher current capacity. These provide functional equivalence but use Standard TRIAC topology instead of Alternistor, requiring verification of gate drive compatibility.
Parameter Comparison
| Part Number | Manufacturer | Triac Type | Voltage (V) | Current (A) | Vgt Max (V) | Igt Max (mA) | Ih Max (mA) | Temp Range (°C) | Status |
|---|---|---|---|---|---|---|---|---|---|
| Q8025R6 | Littelfuse | Alternistor - Snubberless | 800 | 25 | 1.3 | 80 | 100 | -40 to 125 | Discontinued |
| BTA24-800BWRG | STMicroelectronics | Alternistor - Snubberless | 800 | 25 | 1.3 | 50 | 75 | -40 to 125 | Active |
| BTA225-800B,127 | WeEn Semiconductors | Standard | 800 | 25 | 1.5 | 50 | 60 | -40 to 125 | Active |
| BTA330-800BTQ | WeEn Semiconductors | Standard | 800 | 30 | 1.3 | 50 | 75 | -40 to 150 | Active |
| BTB16-800BWRG | STMicroelectronics | Alternistor - Snubberless | 800 | 16 | 1.3 | 50 | 50 | -40 to 125 | Active |
| BTB16-800CWRG | STMicroelectronics | Alternistor - Snubberless | 800 | 16 | 1.3 | 35 | 35 | -40 to 125 | Active |
| BTB12-800CWRG | STMicroelectronics | Alternistor - Snubberless | 800 | 12 | 1.3 | 35 | 35 | -40 to 125 | Active |
| BTB10-800BWRG | STMicroelectronics | Alternistor - Snubberless | 800 | 10 | 1.3 | 50 | 50 | -40 to 125 | Active |
Engineering Selection Recommendations
Primary Substitute - BTA24-800BWRG (STMicroelectronics)
The BTA24-800BWRG is the closest functional equivalent to the Q8025R6. Both are Alternistor-type TRIACs with identical 800V/25A ratings, matching Vgt of 1.3V, and identical temperature range (-40°C to 125°C). The BTA24-800BWRG has lower Igt (50mA vs. 80mA) and Ih (75mA vs. 100mA), which represents improved gate sensitivity and lower holding current. This part is currently active with 4,705 units in stock. ROHS3 compliance and REACH Unaffected status are maintained.
Secondary Substitute - BTA225-800B,127 (WeEn Semiconductors)
The BTA225-800B,127 provides 800V/25A capability with Standard TRIAC topology. Gate trigger voltage is slightly higher at 1.5V (vs. 1.3V), requiring verification that existing gate drive circuits can reliably trigger this part. Lower Igt (50mA) and Ih (60mA) may require gate drive circuit adjustment. This part is active with 2,200 units in stock and maintains ROHS3 compliance and REACH Affected status.
Higher Current Alternative - BTA330-800BTQ (WeEn Semiconductors)
For applications requiring additional current margin, the BTA330-800BTQ provides 30A on-state current at 800V with Standard TRIAC topology. Operating temperature extends to 150°C. Vgt matches at 1.3V. This part is active with 634 units in stock.
Lower Current Alternistor Options
For applications where 25A exceeds actual requirements, the BTB16-800BWRG (16A), BTB12-800CWRG (12A), and BTB10-800BWRG (10A) provide Alternistor topology with 800V rating and -40°C to 125°C operation. These maintain snubberless characteristics and are suitable for reduced-load applications.
Frequently Asked Questions (FAQ)
Q: Can I use BTA225-800B,127 as a direct replacement for Q8025R6?
A: Functionally, yes. Both are rated 800V/25A in TO-220-3 packages. However, the BTA225-800B,127 uses Standard TRIAC topology instead of Alternistor. The gate trigger voltage is 1.5V versus 1.3V on the Q8025R6. Verify that your gate drive circuit can reliably trigger at 1.5V. The lower Igt (50mA vs. 80mA) may also require gate drive adjustment.
Q: What is the difference between Alternistor and Standard TRIAC types?
A: Alternistor (Snubberless) TRIACs are optimized for operation without external snubber networks, reducing component count and PCB area. Standard TRIACs may require snubber circuits in certain applications. If your design relies on snubberless operation, select Alternistor-type substitutes such as BTA24-800BWRG.
Q: Can I use a lower current-rated part like BTB16-800BWRG if my application only draws 16A?
A: Yes, if your actual load current does not exceed 16A RMS. The BTB16-800BWRG maintains 800V rating, Alternistor topology, and -40°C to 125°C operation. Verify that your application's peak and surge currents remain within the part's specifications.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance. Verify REACH status for your specific supply chain requirements; some parts are REACH Unaffected while others are REACH Affected.
Q: What is the impact of different Igt (gate trigger current) values?
A: Lower Igt values indicate higher gate sensitivity, requiring less gate drive current to trigger the TRIAC. The Q8025R6 specifies 80mA maximum Igt, while most substitutes specify 50mA or lower. If your gate drive circuit is designed for 80mA, lower Igt parts will trigger more easily. Verify that your gate drive circuit can reliably source the required current for your selected substitute.
Q: Can I use BTA330-800BTQ (30A) instead of Q8025R6 (25A)?
A: Yes, for applications where higher current capacity provides design margin. The BTA330-800BTQ maintains 800V rating and Standard TRIAC topology. Operating temperature extends to 150°C. Verify that your PCB thermal design and gate drive circuit are compatible with the higher current rating.
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