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STMicroelectronics T810T-8T
- Part No.:
- T810T-8T
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T810T-8T.pdf
- Description:
- TRIAC SENS GATE 800V 8A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:945
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Product details
Overview
T810T-8T from STMicroelectronics is a logic-level, 8 A RMS, 800 V repetitive peak off-state voltage (VDRM/VRRM), three-quadrant triac in TO-220AB package, designed for AC line switching and phase-angle control in motor drives and lighting circuits with microcontroller-compatible 10 mA gate trigger current.
For engineers reviewing the T810T-8T datasheet, T810T-8T pinout, T810T-8T application, or T810T-8T equivalent, key selection criteria include dV/dt immunity (250 V/µs min at 125 °C), I²t rating (24 A²s), thermal resistance (Rth(j-c) = 1.9 °C/W), and ECOPACK2 compliance for environmentally constrained designs.
Technical Context
This triac operates across all three quadrants (I, II, III) with symmetrical triggering characteristics, enabling bidirectional AC conduction without external polarity management. Its low 10 mA gate trigger current (IGT) and 1.3 V max gate trigger voltage (VGT) allow direct drive from 3.3 V or 5 V microcontrollers without buffer stages.
It delivers robust transient immunity: 900 V non-repetitive surge peak off-state voltage (VDSM/VRSM), 60 A non-repetitive surge current (ITSM at 50 Hz), and critical dV/dt immunity up to 250 V/µs at 125 °C - essential for noisy industrial AC mains environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A - Sustains continuous AC load current up to 8 A at case temperature 131 °C, suitable for 1 kW resistive loads at 230 VAC. |
| VDRM / VRRM | 800 V - Blocks 800 V repetitive AC peak voltage at 125 °C junction temperature, supporting 230 VAC + 50% margin applications. |
| IGT | 10 mA max - Gate trigger current threshold enabling direct interface with standard GPIO pins without external amplification. |
| dV/dt (min) | 250 V/µs - Minimum rate of rise of off-state voltage before false turn-on, ensuring noise immunity in high-dV/dt industrial environments. |
| Rth(j-c) | 1.9 °C/W - Junction-to-case thermal resistance enables efficient heatsinking; dissipates ~15.2 W at 8 A with 30 °C temperature rise across heatsink interface. |
| I²t (fusing) | 24 A²s - Energy withstand capability under short-duration surges, defining fuse coordination and overcurrent protection design margins. |
| ECOPACK2 | Halogen-free epoxy, lead-free terminations, UL94 V0 rated - Meets RoHS, REACH, and JEDEC J-STD-020 reflow requirements for green manufacturing. |
Pinout & Package
TO-220AB package: through-hole, single-ended heat-transfer configuration with insulated tab; mounting screw torque 0.4–0.6 N·m; lead finish Pb-free; flammability UL94 V0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate trigger; connects to load return side in standard snubberless configurations. |
| A2 (MT2) | Main Terminal 2 | High-side AC line connection; voltage polarity relative to A1 defines quadrant operation during triggering. |
| G | Gate | Control input accepting 10 mA pulse to initiate conduction in any quadrant; referenced to A1 for triggering sensitivity. |
Key Features
| Feature | Design Value |
|---|---|
| Three-quadrant operation | Triggers reliably in Quadrants I, II, and III - eliminates need for external diodes or polarity compensation in universal AC control. |
| Logic-level gate drive | 10 mA IGT max enables direct MCU GPIO control without discrete driver transistors or optocoupler secondary stages. |
| Snubberless capability | 250 V/µs dV/dt immunity at 125 °C reduces or eliminates external RC snubber networks in motor and inductive load switching. |
| High surge robustness | 63 A ITSM at 60 Hz (16.7 ms) supports repeated inrush events in compressor or transformer primary switching. |
| Thermal performance | 1.9 °C/W Rth(j-c) allows >15 W power dissipation with modest heatsinking - extends lifetime in sealed enclosures. |
Applications
| Motor Control | Lighting Dimming |
|---|---|
Use Scenario: Speed control of universal motors in vacuum cleaners and power tools using phase-angle modulation. IC Role / Device Role / Timing Role: Main AC power switch executing zero-crossing or phase-delayed firing synchronized to AC line cycle. Use Value: Enables precise torque/speed regulation with 8 A RMS current handling and 250 V/µs dV/dt immunity against commutation spikes. | Use Scenario: Leading-edge dimming of incandescent and halogen lamps in residential and commercial fixtures. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered by microcontroller-generated phase-shifted pulses per half-cycle. Use Value: Supports smooth 1–100% dimming range with low EMI due to snubberless operation and controlled turn-on dv/dt. |
| Home Appliance Load Switching | Overvoltage Crowbar Protection |
Use Scenario: On/off cycling of heating elements in rice cookers, coffee makers, and induction cooktop auxiliary controls. IC Role / Device Role / Timing Role: High-reliability AC mains switch activated via isolated logic signal, replacing electromechanical relays. Use Value: 800 V VDRM ensures safe operation under 230 VAC + line surges; ECOPACK2 compliance meets global appliance safety standards. | Use Scenario: Fast-acting crowbar circuit clamping DC bus overvoltage in SMPS or motor drive inverters. IC Role / Device Role / Timing Role: Triggered fail-safe shunt device that latches on when overvoltage exceeds threshold via external sensing network. Use Value: 900 V VRSM withstands transient overvoltages; 15 mA holding current (IH) ensures stable latch until power cycle reset. |
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 |
|---|---|---|---|
| BT139-800E | 8 A RMS, 800 V, 50 mA IGT - higher gate drive requirement. | Requires gate driver stage; less suitable for direct MCU interface. | Select when legacy compatibility or cost sensitivity outweighs logic-level drive convenience. |
| Z0109MN | 9 A RMS, 800 V, 10 mA IGT, but TO-92 package - lower thermal capability (Rth(j-a) ≈ 65 °C/W). | Limited to <1.5 A continuous loads without heatsink; unsuitable for motor or heater duty. | Choose only for space-constrained low-power signaling or pilot-stage switching. |
Compared with BT139-800E and Z0109MN, the T810T-8T uniquely balances logic-level drive (10 mA), 8 A thermal capacity (1.9 °C/W), and 3Q operation - making it optimal for compact, microcontroller-driven AC power control where board space, drive simplicity, and reliability are jointly critical.
Availability
T810T-8T is available at Aetrix Electronics and suitable for motor control, lighting dimming, and home appliance load switching requiring stable component supply and long-term industrial availability.
Supply support for T810T-8T 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.
The T810T-8T belongs to ST's high-reliability AC switch portfolio, engineered specifically for snubberless, logic-compatible AC power control in cost-sensitive, thermally constrained embedded systems.
FAQ
What is the maximum junction temperature for continuous operation?
The T810T-8T supports continuous operation from –40 °C to +150 °C junction temperature. At Tj = 150 °C, key parameters include 800 V VDRM, 0.85 V threshold voltage (VTO), and 57 mΩ dynamic resistance - all specified and tested per DS10471 Rev 2.
Can this triac be used without a heatsink?
At ≤2.5 A RMS load current in free-air convection (Ta = 50 °C), no heatsink is required per Figure 3. Above that, thermal derating applies: at 8 A RMS, case temperature must be held ≤131 °C - requiring a heatsink with thermal resistance ≤1.9 °C/W plus interface resistance.
Is the TO-220AB package electrically insulated?
No - the TO-220AB package has an electrically conductive metal tab (A2/MT2) that is not isolated from the die. For isolation, external insulating hardware (e.g., silicone pad + shoulder washer) must be used between tab and heatsink.
Does this triac support zero-crossing switching?
Yes - its three-quadrant architecture and 250 V/µs dV/dt immunity enable reliable zero-crossing detection and triggering. However, zero-crossing functionality requires external timing circuitry or MCU firmware; the device itself does not integrate zero-crossing detection.
T810T-8T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Logic - Sensitive Gate
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 60A, 63A
- Current - Gate Trigger (Igt) (Max):
- 10 mA
- Current - Hold (Ih) (Max):
- 15 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
T810T-8T FAQ
1.How can I place an order for T810T-8T through Aetrix?
Please submit a Request for Quotation (RFQ) for T810T-8T 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 T810T-8T reliable?
The price and inventory of T810T-8T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T810T-8T is usually 5 days.
3.What payment methods are accepted for T810T-8T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T810T-8T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T810T-8T?
T810T-8T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T810T-8T 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 T810T-8T?
For technical support, including T810T-8T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T810T-8T requirements.
6.How does Aetrix verify that T810T-8T is sourced from the original manufacturer or authorized distributors?
All T810T-8T 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 T810T-8T meets industry standards.
7.What is the process for return or replacement of T810T-8T?
All T810T-8T units undergo pre-shipment inspection (PSI). If there is an issue with T810T-8T, 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 T810T-8T part is unused and in its original packaging.
Return procedure for T810T-8T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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