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Diodes Incorporated T12M35T800UD
- Part No.:
- T12M35T800UD
- Manufacturer:
- Diodes Incorporated
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T12M35T800UD.pdf
- Description:
- THYRISTOR TO220AB TUBE 50PCS
- Quantity:
- Payment:
- Shipping:
Inventory:4,699
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Product details
Overview
T12M35T800UD from Diodes Incorporated is a glass-passivated, bidirectional silicon thyristor (TRIAC) rated for 800V repetitive peak off-state voltage and 12A RMS on-state current, with 35mA gate trigger current in Quadrants I, II, and III. It operates up to +125°C junction temperature and is used in AC phase-control circuits for motor speed regulation and resistive load dimming in household appliances.
For engineers reviewing the T12M35T800UD datasheet, T12M35T800UD pinout, T12M35T800UD application, or T12M35T800UD equivalent, key selection criteria include verified dV/dt immunity (2000 V/µs at TJ = +125°C), latching current (50 mA max), holding current (50 mA max), and TO220AB thermal resistance (RθJC = 2.3 °C/W).
Technical Context
This TRIAC supports three-quadrant triggering only-no gate sensitivity in Quadrant IV-enabling robust noise-immune commutation in mains-synchronized AC control. Its glass passivation ensures stable VDRM/VRRM performance under humidity and thermal stress.
The device delivers 90A non-repetitive surge capability (t = 16.7ms, 60Hz) and 40.5 A²s I²t rating, allowing reliable handling of inrush currents in universal motor drives and heating element switching without external snubbers in many designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 800 V - Sustains full AC line peaks (e.g., 565 Vpk @ 400 VAC RMS) with margin for transients |
| IT(RMS) | 12 A - Supports continuous load current up to 1.44 kW at 120 VAC or 2.88 kW at 240 VAC |
| IGT (Q1/Q2/Q3) | 35 mA max - Gate drive compatible with standard microcontroller GPIO or optocoupler outputs |
| dV/dt (TJ = +125°C) | 2000 V/µs - Resists false triggering during fast voltage transients in noisy industrial environments |
| RθJC | 2.3 °C/W - Enables 12A operation with ≤27.6°C case-to-junction rise using minimal heatsinking |
| IL / IH | 50 mA / 50 mA max - Ensures reliable turn-on and sustained conduction under low-load conditions (e.g., fan idle) |
| VT (IT = 12A) | 1.6 V - Low conduction loss (~19.2 W dissipation at full load) improves thermal efficiency |
Pinout & Package
Package: TO220AB (Type WX), molded plastic, lead-free, RoHS-compliant, with matte tin-plated leads. Internally insulated construction eliminates need for isolated mounting hardware.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 (Main Terminal 1) | Anode for forward conduction; cathode for reverse conduction | Primary AC line connection point; symmetric bidirectional current path |
| MT2 (Main Terminal 2) | Cathode for forward conduction; anode for reverse conduction | Second AC line connection; forms complete AC switching path with MT1 |
| G (Gate) | Control electrode for triggering conduction in Quadrants I, II, III | Accepts low-energy pulse (≤35 mA) to initiate bidirectional conduction; no QIV sensitivity |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivation | Prevents surface leakage and degradation under humid or high-bias stress, extending field life |
| Three-quadrant triggering | Eliminates false turn-on from negative gate noise while retaining full AC phase control capability |
| Internally insulated package | Allows direct mounting to grounded heatsinks without insulating washers or pads |
| High dV/dt immunity (2000 V/µs) | Reduces need for external RC snubbers in motor control applications with inductive kickback |
| AEC-Q101 readiness | Manufactured in IATF 16949-certified facilities; PPAP-capable for automotive-grade power modules |
Applications
| AC Motor Speed Control | Resistive Load Dimming |
|---|---|
Use Scenario: Variable-speed control of universal motors in power tools and vacuum cleaners. IC Role / Device Role / Timing Role: Main AC power switch triggered synchronously with zero-crossing detection for smooth torque delivery. Use Value: Enables precise 0–100% speed adjustment with <1.6 V conduction drop, minimizing heat generation at full load. |
Use Scenario: Phase-angle dimming of incandescent/halogen lamps and heating elements in coffee machines. IC Role / Device Role / Timing Role: Bidirectional AC switch controlled by microcontroller-generated gate pulses aligned to AC zero crossings. Use Value: Delivers flicker-free dimming with 50 mA latching/holding current ensuring stable conduction at low brightness levels. |
| Fan Speed Regulation | Heating System Switching |
Use Scenario: Multi-stage airflow control in HVAC blowers and kitchen exhaust fans. IC Role / Device Role / Timing Role: Line-voltage AC switch modulated via leading-edge phase control to adjust average power. Use Value: Maintains reliable turn-on down to 25°C ambient using 35 mA IGT, even with aging gate drive circuitry. |
Use Scenario: On/off and power-level switching of 120/240 VAC heating coils in water heaters and ovens. IC Role / Device Role / Timing Role: High-current AC power switch handling 90A surge during cold-start coil energization. Use Value: Withstands 40.5 A²s I²t rating and 2.3 °C/W RθJC, enabling compact thermal design without forced air cooling. |
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 BTB12-800CW | Same 12A/800V rating; 35mA IGT; TO220AB package; but requires external insulation for heatsink mounting | Lacks internal insulation; needs silicone pad/washer for grounded heatsinks | Select when cost sensitivity outweighs assembly simplification; verify thermal interface compliance |
| ON Semiconductor MAC12N8G | 12A/800V; 50mA IGT; TO220AB; lower dV/dt (1000 V/µs); higher VT (1.7 V) | Higher gate drive demand and reduced transient immunity limit use in noisy industrial settings | Prefer for low-cost consumer products where gate drive margin and EMI robustness are less critical |
Compared with BTB12-800CW and MAC12N8G, T12M35T800UD offers integrated insulation and superior dV/dt immunity-reducing BOM count and improving reliability in thermally constrained, electrically noisy motor control systems.
Availability
T12M35T800UD is available at Aetrix Electronics and suitable for AC motor controls, residential dimming systems, and heating appliance designs requiring stable component supply, RoHS compliance, and automotive-grade manufacturing traceability.
Supply support for T12M35T800UD 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.
T12M35T800UD belongs to Diodes' high-voltage TRIAC family designed specifically for ruggedized AC power switching in consumer, industrial, and automotive auxiliary systems-emphasizing thermal resilience, gate noise immunity, and long-term parametric stability.
FAQ
What is the maximum junction temperature and how does it affect thermal design?
The T12M35T800UD has a maximum junction temperature of +125°C. With a thermal resistance RθJC of 2.3 °C/W, a 12A load producing 19.2W conduction loss requires ≤27.6°C temperature rise from case to junction. This allows use with small aluminum heatsinks (e.g., 100mm × 42mm × 27mm fin type) without forced air cooling in most applications.
Does this TRIAC support four-quadrant triggering?
No. The T12M35T800UD triggers only in Quadrants I, II, and III. It is not sensitive to gate signals in Quadrant IV (MT2 negative, gate positive), which improves noise immunity in high-dV/dt environments but requires gate drive circuitry to avoid QIV bias conditions during AC half-cycles.
Can it replace the T12M10T800UD in existing designs?
Yes, with design review. Both share identical voltage/current ratings and package, but T12M35T800UD has higher IGT (35mA vs. 10mA), IL (50mA vs. 25mA), and IH (50mA vs. 15mA). Gate drive must supply ≥35mA, and minimum load current must exceed 50mA to maintain conduction-verify compatibility with existing control logic and load profiles.
Is this part qualified for automotive applications?
The T12M35T800UD is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, Diodes offers automotive-grade variants (e.g., T12M35T800UD-AQ) with full qualification-contact Diodes or Aetrix for change-controlled, AEC-compliant versions for safety-critical vehicle subsystems.
T12M35T800UD 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):
- 12 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.5 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 90A @ 50Hz, 90A @ 60Hz
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 50 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO220AB (Type WX)
T12M35T800UD FAQ
1.How can I place an order for T12M35T800UD through Aetrix?
Please submit a Request for Quotation (RFQ) for T12M35T800UD 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 T12M35T800UD reliable?
The price and inventory of T12M35T800UD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T12M35T800UD is usually 5 days.
3.What payment methods are accepted for T12M35T800UD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T12M35T800UD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T12M35T800UD?
T12M35T800UD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T12M35T800UD 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 T12M35T800UD?
For technical support, including T12M35T800UD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T12M35T800UD requirements.
6.How does Aetrix verify that T12M35T800UD is sourced from the original manufacturer or authorized distributors?
All T12M35T800UD 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 T12M35T800UD meets industry standards.
7.What is the process for return or replacement of T12M35T800UD?
All T12M35T800UD units undergo pre-shipment inspection (PSI). If there is an issue with T12M35T800UD, 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 T12M35T800UD part is unused and in its original packaging.
Return procedure for T12M35T800UD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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