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STMicroelectronics T835-8G-TR
- Part No.:
- T835-8G-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
T835-8G-TR.pdf
- Description:
- TRIAC ALTERNISTOR 800V 8A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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Product details
Overview
T835-8G-TR from STMicroelectronics is a snubberless 8 A, 600 V triac in D²PAK (TO-263) package, designed for phase-controlled AC switching in inductive loads. It features 35 mA maximum gate trigger current (IGT), 400 V/µs dV/dt immunity at 125 °C, and 50 A/µs critical di/dt rating - enabling robust commutation in motor speed controllers and heating regulation circuits without external snubbers.
For engineers reviewing the T835-8G-TR datasheet, T835-8G-TR pinout, T835-8G-TR application, or T835-8G-TR equivalent, key selection criteria include snubberless operation on inductive loads, logic-compatible gate drive (35 mA IGT), thermal resistance of 1.6 °C/W (junction-to-case), and D²PAK surface-mount compatibility with 1000-unit tape-and-reel packaging.
Technical Context
This triac operates in three quadrants (I, II, III) with snubberless commutation capability, optimized for high-noise industrial AC line environments. Its 400 V/µs dV/dt rating at 125 °C and 5.4 A/ms critical di/dt ensure reliable turn-off under inductive load transients without snubber networks.
The device uses a gate-triggered thyristor structure with integrated ceramic isolation in insulated variants (not applicable to T835-8G-TR), and its 1.55 V max on-state voltage (VTM) at 11 A and 25 °C supports low conduction loss in continuous-duty applications up to 125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A RMS on-state current - supports continuous 8 A AC load current at 110 °C case temperature |
| VDRM / VRRM | 600 V repetitive peak off-state voltage - rated for 230 VAC mains with ≥2× safety margin |
| IGT (max) | 35 mA gate trigger current - compatible with microcontroller GPIOs without buffer stage |
| dV/dt (min) | 400 V/µs at 125 °C - enables snubberless operation on inductive loads like motors and solenoids |
| Rth(j-c) | 1.6 °C/W junction-to-case thermal resistance - allows 8 A operation with minimal heatsinking at Tc ≤ 110 °C |
| VTM (max) | 1.55 V at 11 A, 25 °C - limits conduction loss to <17 W at full RMS current |
| (dl/dt)c (min) | 3.5 A/ms at 125 °C - ensures reliable commutation during zero-crossing turn-off in phase-control dimmers |
Pinout & Package
D²PAK (TO-263) surface-mount package with exposed drain tab (A2) for thermal and electrical connection; thermally enhanced layout requires ≥10 cm² copper pour per IPC-2221B Class B for rated IT(RMS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main Terminal 1 | AC line return path; connected to neutral or low-side AC rail in phase-control topology |
| A2 | Main Terminal 2 | High-current output terminal; electrically and thermally tied to exposed metal tab |
| G | Gate | Low-energy trigger input; 35 mA pulse sufficient for turn-on at 125 °C junction temperature |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless commutation | Validated 400 V/µs dV/dt immunity at 125 °C eliminates need for RC snubber on inductive loads |
| Logic-level gate drive | 35 mA max IGT enables direct interface with 3.3 V/5 V MCU outputs without external driver |
| Three-quadrant operation | Guaranteed turn-on in quadrants I, II, and III - simplifies control circuitry vs. 4Q triacs |
| D²PAK thermal performance | 1.6 °C/W Rth(j-c) supports 8 A RMS with compact heatsink or PCB copper area only |
| ECOPACK2 compliance | Halogen-free molding compound, lead-free terminations, and RoHS/REACH conformity |
Applications
| Motor Speed Control | Heating Regulation |
|---|---|
|
Use Scenario: Variable-speed control of single-phase induction motors in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Main AC power switch in phase-angle control circuit, triggered synchronously with AC zero-crossing. Use Value: Snubberless operation prevents false triggering during motor back-EMF spikes, reducing component count and board space. |
Use Scenario: Proportional power delivery to resistive heating elements in industrial ovens and soldering stations. IC Role / Device Role / Timing Role: High-current AC switch modulating RMS power via firing angle adjustment. Use Value: 8 A IT(RMS) rating and 1.55 V VTM enable stable 1.8 kW @ 230 VAC with <17 W conduction loss. |
| Light Dimming | Static Relay Replacement |
|
Use Scenario: Leading-edge dimming of incandescent and halogen lamps in residential/commercial lighting. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered at programmable phase angle to adjust lamp brightness. Use Value: 35 mA IGT ensures reliable turn-on even with aging microcontroller outputs and elevated ambient temperatures. |
Use Scenario: Solid-state replacement for electromechanical relays in PLC output modules and building automation panels. IC Role / Device Role / Timing Role: Zero-voltage-switched AC load switch with galvanic isolation provided externally. Use Value: 600 V VDRM and 80 A non-repetitive surge rating support 100k-cycle lifetime under 10 A inductive loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac-based AC switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTA08-600BW | TO-220AB insulated package, 50 mA IGT, same 600 V/8 A rating | Requires heatsink mounting and higher gate drive; suited for through-hole legacy designs | Select when mechanical mounting constraints favor TO-220AB or UL-rated 2500 VRMS isolation is required |
| T850-6G-TR | D²PAK package, 50 mA IGT, 600 V/10 A rating, higher IT(RMS) | Higher current capacity but less gate sensitivity; needs stronger gate drive | Select when system requires >8 A RMS load current and gate drive can supply ≥50 mA |
Compared with BTA08-600BW, T835-8G-TR offers surface-mount assembly and lower gate drive demand; versus T850-6G-TR, it provides better gate sensitivity for MCU interfacing while sacrificing 2 A RMS headroom.
Availability
T835-8G-TR is available at Aetrix Electronics and suitable for motor speed control, heating regulation, light dimming, and static relay replacement requiring stable component supply across industrial OEM production cycles.
Supply support for T835-8G-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
T835-8G-TR belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC power control in noisy inductive-load environments without external protection components.
FAQ
What is the maximum junction temperature for continuous operation of T835-8G-TR?
The T835-8G-TR has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at 125 °C requires maintaining case temperature ≤110 °C per the IT(RMS) derating curve in Figure 2, achievable with ≥10 cm² of 35 µm copper on FR4 PCB or minimal heatsinking.
Does T835-8G-TR require a snubber circuit for inductive loads?
No. As a snubberless triac, T835-8G-TR is characterized for 400 V/µs dV/dt immunity at 125 °C and 3.5 A/ms critical di/dt, enabling reliable commutation on inductive loads like motors and transformers without external RC snubbers - confirmed in Table 2 and Figure 9 of DS2114.
Can T835-8G-TR be driven directly by a 3.3 V microcontroller GPIO?
Yes. With a maximum gate trigger current (IGT) of 35 mA at 25 °C and 1.2 V gate trigger voltage (VGT), the T835-8G-TR is compatible with standard 3.3 V or 5 V MCU outputs. A series resistor (e.g., 100 Ω) limits peak gate current to safe levels during triggering.
What is the thermal resistance from junction to ambient for T835-8G-TR in typical PCB layout?
In a typical FR4 PCB layout with 1 cm² copper area under the D²PAK tab, the junction-to-ambient thermal resistance (Rth(j-a)) is 45 °C/W (per Table 5). This value improves significantly with larger copper pours - e.g., 10 cm² reduces Rth(j-a) to ~15 °C/W, enabling higher sustained current.
T835-8G-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.2 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 80A, 84A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 35 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
T835-8G-TR FAQ
1.How can I place an order for T835-8G-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for T835-8G-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for T835-8G-TR reliable?
The price and inventory of T835-8G-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T835-8G-TR is usually 5 days.
3.What payment methods are accepted for T835-8G-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T835-8G-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T835-8G-TR?
T835-8G-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T835-8G-TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for T835-8G-TR?
For technical support, including T835-8G-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T835-8G-TR requirements.
6.How does Aetrix verify that T835-8G-TR is sourced from the original manufacturer or authorized distributors?
All T835-8G-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that T835-8G-TR meets industry standards.
7.What is the process for return or replacement of T835-8G-TR?
All T835-8G-TR units undergo pre-shipment inspection (PSI). If there is an issue with T835-8G-TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The T835-8G-TR part is unused and in its original packaging.
Return procedure for T835-8G-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T835-8G-TR Tags
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