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STMicroelectronics T835-8G
- Part No.:
- T835-8G
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
T835-8G.pdf
- Description:
- TRIAC ALTERNISTOR 800V 8A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:6,130
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Product details
Overview
T835-8G from STMicroelectronics is a snubberless, logic-level 8 A triac in D²PAK (TO-263) package, rated for 600 V repetitive peak off-state voltage (VDRM/VRRM), with 35 mA maximum gate trigger current (IGT) and 1.55 V max on-state voltage (VTM) at 11 A. It operates across -40 °C to +125 °C junction temperature and delivers 50 A/µs critical rate of rise of on-state current (dl/dt), enabling robust switching in inductive AC loads such as motor speed controllers and heating regulation circuits.
For engineers reviewing the T835-8G datasheet, T835-8G pinout, T835-8G application, or T835-8G equivalent, this device is selected for snubberless operation on inductive loads, direct microcontroller interface due to low IGT, high commutation performance, and thermal reliability in surface-mount power control designs.
Technical Context
This triac belongs to ST's T8 series of 3-quadrant snubberless logic-level devices, optimized for phase-control and ON/OFF switching in AC mains applications. Its design eliminates need for external snubbers when driving inductive loads, supported by guaranteed dV/dt immunity up to 400 V/µs and (dl/dt)c ≥ 3.5 A/ms at 125 °C.
The device features internal ceramic insulation in insulated variants (not applicable to T835-8G), but T835-8G uses standard D²PAK thermally enhanced surface-mount packaging with Rth(j-c) = 1.6 °C/W and Rth(j-a) = 45 °C/W (S = 1 cm²), enabling high-power dissipation without heatsink in moderate-duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A RMS on-state current - supports continuous 8 A AC load current at Tc = 110 °C with full sine wave conduction. |
| VDRM / VRRM | 600 V - withstands 600 V repetitive peak off-state voltage in both directions, suitable for 230 VAC mains with safety margin. |
| IGT (max) | 35 mA - enables direct drive from low-power MCU GPIOs without external buffer amplification. |
| VTM | 1.55 V max at ITM = 11 A - defines on-state conduction loss; combined with RD = 50 mΩ, yields predictable thermal rise under load. |
| dV/dt (min) | 400 V/µs - ensures reliable commutation without false triggering during fast voltage transients on inductive loads. |
| Rth(j-c) | 1.6 °C/W - junction-to-case thermal resistance allows efficient heat transfer to PCB copper or heatsink in D²PAK footprint. |
| ITSM (50 Hz) | 80 A non-repetitive surge - sustains short-duration motor startup or fault currents without latch-up or failure. |
Pinout & Package
Package: D²PAK (TO-263), surface-mount, thermally enhanced plastic package with exposed drain pad (A2 tab) for PCB thermal conduction. Meets UL94 V0, halogen-free, lead-free plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main terminal 1 (anode 1) | Primary current path input; referenced to A2 for bidirectional AC conduction; connected to load return side in typical phase-control layout. |
| A2 | Main terminal 2 (anode 2) | Main current output terminal; electrically tied to exposed metal tab (thermal pad); must be connected to PCB copper pour for thermal management. |
| G | Gate | Control input for triggering conduction; accepts low-current logic-level pulses (≤35 mA); polarity-sensitive for quadrants I, II, III only. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Guaranteed commutation without external RC snubber on inductive loads up to 400 V/µs dV/dt and 3.5 A/ms (dl/dt)c. |
| Logic-level gate drive | Max 35 mA IGT enables direct interface with 3.3 V/5 V microcontrollers, reducing BOM count and board space. |
| D²PAK thermal performance | Rth(j-c) = 1.6 °C/W and Rth(j-a) = 45 °C/W (1 cm² copper) allow higher power density than TO-220AB in compact SMT layouts. |
| High surge capability | 80 A non-repetitive surge current (50 Hz, 20 ms) supports motor starting and transient overload conditions. |
| Three-quadrant operation | Operates in quadrants I, II, and III only - improves noise immunity and reduces false triggering vs. 4Q triacs in noisy environments. |
Applications
| Motor Speed Control | Heating Regulation |
|---|---|
|
Use Scenario: Variable-speed control of single-phase induction motors in fans, pumps, and compressors using phase-angle firing. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered at precise phase angle to modulate RMS voltage delivered to motor winding. Use Value: Eliminates need for external snubber components while maintaining stable commutation across wide load inductance range (up to 400 V/µs dV/dt). |
Use Scenario: Precise temperature maintenance in resistive heating elements of ovens, water heaters, and industrial process equipment. IC Role / Device Role / Timing Role: Zero-crossing or phase-control AC switch regulating average power delivered to heater via duty-cycle modulation. Use Value: 35 mA logic-level gate drive allows direct PWM control from MCU timers without level-shifting or driver ICs. |
| Light Dimming | Static Relay Replacement |
|
Use Scenario: Mains-powered LED or incandescent lamp dimming in residential and commercial lighting systems. IC Role / Device Role / Timing Role: Phase-controlled triac switching synchronized to AC zero-crossing to adjust conduction angle per half-cycle. Use Value: Snubberless architecture prevents EMI-induced misfiring during rapid dimming transitions, improving user experience and compliance. |
Use Scenario: Solid-state replacement of electromechanical relays in PLC I/O modules, HVAC controls, and industrial automation panels. IC Role / Device Role / Timing Role: High-reliability ON/OFF AC switching element with 8 A RMS rating and 80 A surge tolerance for load cycling. Use Value: D²PAK surface-mount package enables automated assembly and higher board density versus through-hole alternatives like TO-220AB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| T835-600G | Same electrical specs and D²PAK package; differs only in marking and reel packaging (TR vs. tube), no functional difference. | Identical use cases; selected when tape-and-reel delivery is required for SMT production. | Preferred for high-volume automated assembly where reel feeding is mandatory. |
| BTA08-600CW | Same 8 A / 600 V / 35 mA IGT rating but in insulated TO-220AB package; Rth(j-c) = 2.5 °C/W; requires mechanical mounting and heatsink. | Suitable for through-hole prototyping or legacy designs requiring isolation and higher creepage/clearance. | Chosen when reinforced insulation (2500 VRMS) or retrofit into existing TO-220 footprints is needed. |
Compared with T835-600G, T835-8G offers identical performance in tube packaging for low-volume or evaluation use; versus BTA08-600CW, it trades insulation and mounting flexibility for superior thermal efficiency and SMT manufacturability in space-constrained designs.
Availability
T835-8G is available at Aetrix Electronics and suitable for motor speed control, heating regulation, light dimming, and static relay replacement requiring stable component supply, consistent D²PAK sourcing, and long-term industrial lifecycle support.
Supply support for T835-8G 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
T835-8G belongs to ST's T8 series of snubberless logic-level triacs, engineered specifically for reliable, low-component-count AC power control in surface-mount industrial and appliance applications.
FAQ
What is the maximum junction temperature for continuous operation of T835-8G?
The T835-8G has an operating junction temperature range of -40 °C to +125 °C. Continuous operation at 125 °C requires thermal design ensuring case temperature does not exceed 110 °C at 8 A RMS, per absolute maximum ratings table. Derating curves in Figure 2 confirm 8 A is sustainable at Tc ≤ 110 °C.
Can T835-8G replace a standard 4-quadrant triac in existing designs?
No - T835-8G is a 3-quadrant device (I, II, III only) and cannot conduct in quadrant IV. Substitution requires verifying that the original circuit does not rely on quadrant IV triggering, especially in zero-crossing or high-noise environments where 4Q behavior may have been exploited for timing margin.
Is a heatsink required for T835-8G at 8 A RMS load current?
A heatsink is not required if PCB copper area meets minimum thermal requirements: ≥1 cm² under the D²PAK tab yields Rth(j-a) ≈ 45 °C/W. At 8 A RMS and VTM ≈ 1.5 V, power dissipation is ~12 W; with ambient ≤ 50 °C, junction temperature reaches ~104 °C - within spec. Larger copper or heatsink extends margin.
Does T835-8G require a gate resistor when driven by an MCU?
Yes - a series gate resistor (typically 100–470 Ω) is recommended to limit peak gate current (IGM = 4 A) and damp ringing. The resistor value balances safe IGT compliance (≤35 mA) with sufficient dv/dt immunity; ST application note AN4377 specifies 220 Ω for 3.3 V MCU drive into 30 Ω load.
T835-8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for T835-8G through Aetrix?
Please submit a Request for Quotation (RFQ) for T835-8G 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 reliable?
The price and inventory of T835-8G 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 is usually 5 days.
3.What payment methods are accepted for T835-8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T835-8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T835-8G?
T835-8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T835-8G 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?
For technical support, including T835-8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T835-8G requirements.
6.How does Aetrix verify that T835-8G is sourced from the original manufacturer or authorized distributors?
All T835-8G 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 meets industry standards.
7.What is the process for return or replacement of T835-8G?
All T835-8G units undergo pre-shipment inspection (PSI). If there is an issue with T835-8G, 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 part is unused and in its original packaging.
Return procedure for T835-8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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