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Diodes Incorporated T8M10T800UD
- Part No.:
- T8M10T800UD
- Manufacturer:
- Diodes Incorporated
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T8M10T800UD.pdf
- Description:
- THYRISTOR TO220AB TUBE 50PCS
- Quantity:
- Payment:
- Shipping:
Inventory:9,741
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Product details
Overview
T8M10T800UD from Diodes Incorporated is a glass-passivated, bidirectional silicon thyristor (TRIAC) rated for 800V repetitive peak off-state voltage and 8A RMS on-state current, with 10mA gate trigger current in Quadrant I/II/III. It operates up to +125°C junction temperature and is used in AC phase-controlled power regulation for motor drives, light dimmers, and heating systems.
For engineers reviewing the T8M10T800UD datasheet, T8M10T800UD pinout, T8M10T800UD application, or T8M10T800UD equivalent, key selection criteria include dV/dt immunity (40 V/µs min), latching current (25 mA typ), holding current (15 mA max), and TO220AB thermal resistance (RθJC = 3.3 °C/W).
Technical Context
This TRIAC supports three-quadrant triggering only-excluding Quadrant IV-enabling robust noise-immune gate control in AC line-synchronized switching. Its glass-passivated junction ensures stable VDRM/VRRM performance under transient overvoltage stress and high-temperature operation.
The device features an internally insulated TO220AB package with matte tin-plated leads, rated for 55A non-repetitive surge current (20ms, 50Hz) and 15.1 A²s I²t fusing value. Thermal design is enabled by low junction-to-case resistance (3.3 °C/W) when mounted on an 80mm × 80mm × 1.5mm copper heatsink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 800 V - Withstands 800V peak AC line voltage without conduction; suitable for 230VAC mains applications with safety margin. |
| IT(RMS) | 8 A - Sustains continuous 8A RMS load current at TJ = +125°C; enables driving universal motors or resistive heaters up to ~1.8 kW. |
| IGT (Q1/Q2/Q3) | 10 mA max - Low gate drive requirement compatible with microcontroller GPIO or optocoupler outputs without external amplification. |
| dV/dt (off-state) | 40 V/µs min - Resists false triggering from rapid voltage transients on AC lines; eliminates need for snubber in many low-noise environments. |
| RθJC | 3.3 °C/W - Enables efficient heat transfer to heatsink; allows 8A operation with ≤26.4°C temperature rise across junction-to-case interface. |
| IL / IH | 25 mA / 15 mA max - Ensures reliable turn-on and sustained conduction under worst-case load conditions including inductive kickback and cold-start. |
| VT (IT = 8A) | 1.6 V max - Limits on-state power loss to ≤12.8 W at full load, reducing thermal burden and improving system efficiency. |
Pinout & Package
Package: TO220AB (Type WX), molded plastic, lead-free, RoHS-compliant, UL 94V-0 rated. Weight: 2.08 g. Mounting hole accommodates M3 screw; tab is electrically connected to MT2 terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 (Main Terminal 1) | Anode of forward-conducting path; reference terminal for gate trigger polarity in Q1/Q2 | Connected to AC line neutral or low-side return; defines gate voltage reference during triggering. |
| MT2 (Main Terminal 2) | Cathode of forward-conducting path; common high-side connection point | Electrically tied to metal tab; must be isolated from heatsink unless using insulating washer or isolated mounting hardware. |
| G (Gate) | Control electrode for bidirectional conduction initiation | Accepts low-current DC pulse to trigger conduction in Quadrants I, II, and III; requires no negative gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivation | Enhances voltage ruggedness and long-term reliability under repeated dv/dt stress and humidity exposure. |
| Three-quadrant triggering | Eliminates Quadrant IV operation, reducing susceptibility to false turn-on from capacitive coupling or EMI. |
| Internally insulated package | Provides reinforced isolation between MT2/tab and internal die; simplifies heatsink mounting without additional insulation layers. |
| High TJ rating (+125°C) | Supports operation in enclosed industrial enclosures or automotive under-hood environments without derating below 8A RMS. |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb); compliant for automotive PPAP. |
Applications
| AC Motor Speed Control | Resistive Load Dimming |
|---|---|
Use Scenario: Variable-speed control of universal motors in power tools like electric drills and sanders. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered synchronously with zero-crossing detection to regulate average power delivered to motor windings. Use Value: Enables smooth torque control and soft-start behavior while maintaining gate drive simplicity and thermal stability at 8A RMS. |
Use Scenario: Phase-angle dimming of incandescent and halogen lamps in residential lighting systems. IC Role / Device Role / Timing Role: TRIAC acts as main AC power switch controlled by leading-edge dimmer circuitry with RC timing network. Use Value: Delivers flicker-free dimming down to 5% brightness with minimal gate current (10 mA) and low VT (1.6 V) for reduced heat generation. |
| Heating Element Regulation | Fan Speed Control |
Use Scenario: Duty-cycled power delivery to resistive heating elements in coffee machines and food processors. IC Role / Device Role / Timing Role: High-voltage, high-current AC switch activated via microcontroller-driven optocoupler for precise thermal management. Use Value: Supports 800V VDRM margin against line surges and maintains stable conduction with 15 mA holding current even during thermal cycling. |
Use Scenario: Low-noise speed control of shaded-pole or PSC fans in HVAC and appliance ventilation systems. IC Role / Device Role / Timing Role: TRIAC provides phase-controlled AC voltage reduction to fan motor, synchronized to avoid audible whine. Use Value: Three-quadrant triggering prevents erratic commutation during low-speed operation, ensuring consistent torque and acoustic performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TRIAC-based AC power control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BT139-800E | Same TO220AB package, 8A/800V rating, but higher IGT (≤50 mA) and lower dV/dt immunity (25 V/µs). | Requires stronger gate drive; less robust in noisy industrial environments without snubbers. | Select when cost sensitivity outweighs need for ultra-low gate drive or high dV/dt tolerance. |
| Littelfuse Q6008LH4TP | 8A/600V rating, TO220AB, 35 mA IGT, but lacks glass passivation and has lower TJ limit (+110°C). | Suitable for 120VAC systems only; not recommended for 230VAC mains or high-temperature enclosures. | Choose only for legacy 120VAC designs where voltage margin and thermal headroom are not critical. |
Compared with BT139-800E and Q6008LH4TP, T8M10T800UD offers superior gate sensitivity (10 mA vs. ≥35 mA), higher dV/dt immunity (40 V/µs), and extended junction temperature capability (+125°C), making it optimal for compact, thermally constrained 230VAC industrial controls.
Availability
T8M10T800UD is available at Aetrix Electronics and suitable for AC motor control, lighting dimming, heating regulation, and fan speed management requiring stable component supply and long-term industrial lifecycle support.
Supply support for T8M10T800UD 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions.
T8M10T800UD belongs to Diodes' high-voltage TRIAC product line, engineered for robust AC power switching in consumer appliances, industrial equipment, and building automation systems.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The T8M10T800UD is rated for continuous operation up to +125°C junction temperature, as confirmed in the Absolute Maximum Ratings table. Derating is required above this temperature, and thermal design must ensure RθJA does not exceed 10.5 °C/W under ambient conditions.
Is a heatsink required for 8A RMS operation?
Yes - at 8A RMS and +125°C junction temperature, power dissipation reaches ~12.8 W (VT × IT). With RθJC = 3.3 °C/W and typical RθCS + RθSA > 1.7 °C/W, a heatsink is mandatory to maintain safe junction temperature; minimum recommended thermal resistance is ≤5.0 °C/W total.
Does T8M10T800UD support Quadrant IV triggering?
No - the device is specified for three-quadrant triggering only (Quadrants I, II, and III). Quadrant IV operation is not guaranteed and is excluded per datasheet Feature list and electrical characterization curves.
Can this TRIAC replace T8M35T800UD in existing designs?
No - T8M10T800UD has 10 mA max IGT versus 35 mA for T8M35T800UD. Substituting the lower-IGT part may cause unintended triggering in circuits designed for higher gate current thresholds; verify gate drive strength and noise immunity before replacement.
T8M10T800UD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Active
- Triac Type:
- Standard
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.5 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 55A, 60A
- Current - Gate Trigger (Igt) (Max):
- 10 mA
- Current - Hold (Ih) (Max):
- 15 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO220AB (Type WX)
T8M10T800UD FAQ
1.How can I place an order for T8M10T800UD through Aetrix?
Please submit a Request for Quotation (RFQ) for T8M10T800UD 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 T8M10T800UD reliable?
The price and inventory of T8M10T800UD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T8M10T800UD is usually 5 days.
3.What payment methods are accepted for T8M10T800UD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T8M10T800UD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T8M10T800UD?
T8M10T800UD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T8M10T800UD 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 T8M10T800UD?
For technical support, including T8M10T800UD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T8M10T800UD requirements.
6.How does Aetrix verify that T8M10T800UD is sourced from the original manufacturer or authorized distributors?
All T8M10T800UD 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 T8M10T800UD meets industry standards.
7.What is the process for return or replacement of T8M10T800UD?
All T8M10T800UD units undergo pre-shipment inspection (PSI). If there is an issue with T8M10T800UD, 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 T8M10T800UD part is unused and in its original packaging.
Return procedure for T8M10T800UD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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