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Diodes Incorporated T12M35T800UB
- Part No.:
- T12M35T800UB
- Manufacturer:
- Diodes Incorporated
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T12M35T800UB.pdf
- Description:
- THYRISTOR TO220AB TUBE 50PCS
- Quantity:
- Payment:
- Shipping:
Inventory:5,617
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Product details
Overview
T12M35T800UB from Diodes Incorporated is a glass-passivated, lead-free, halogen-free TRIAC designed for AC power switching in mains-connected loads. It delivers 12A RMS on-state current at 800V repetitive peak off-state voltage, with 35mA gate trigger current (IGT1/IGT2/IGT3), 50mA holding current (IH3), and operation up to +125°C junction temperature - used in motor speed control circuits for electric drills and heating systems.
For engineers reviewing the T12M35T800UB datasheet, T12M35T800UB pinout, T12M35T800UB application, or T12M35T800UB equivalent, key selection criteria include quadrants I/II/III triggering capability, dV/dt immunity (2000 V/µs at TJ = +125°C), thermal resistance (RθJC = 1.8 °C/W), and TO220AB package compatibility with standard heatsinks.
Technical Context
This bidirectional thyristor operates in three quadrants (I, II, III) only - excluding quadrant IV triggering - enabling robust commutation in phase-controlled AC applications. Its glass passivation ensures stable VDRM/VRRM (800V) and high dV/dt immunity (2000 V/µs at TJ = +125°C), critical for noisy industrial environments.
The device supports 90A non-repetitive surge current (ITSM) at 50/60Hz and features low on-state voltage (VT = 1.6V at IT = 12A, IGT = 70mA), minimizing conduction losses. Thermal design is enabled by RθJC = 1.8 °C/W and RθJL = 1.6 °C/W, validated per JESD-51 with an aluminum fin-type heatsink (85mm × 32mm × 24mm).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 800V - Withstands peak AC line voltages up to 566V RMS without turn-on; suitable for 230V and 240V mains systems. |
| IT(RMS) | 12A - Sustains continuous load current for motors, heaters, and dimmers without derating at TJ ≤ +125°C. |
| IGT (max) | 35mA - Gate drive requirement compatible with standard microcontroller GPIO or optocoupler outputs (e.g., MOC302x/MOC304x). |
| dV/dt (min) | 2000 V/µs - Resists false triggering from fast transients in industrial EMI environments without snubber networks. |
| RθJC | 1.8 °C/W - Enables efficient heat transfer to heatsink; allows ~10W dissipation at ΔTJC = 18°C (e.g., 12A × 1.6V × 0.5 duty ≈ 9.6W). |
| IH (max) | 50mA - Minimum load current required to maintain conduction after triggering; ensures reliable hold in low-power fan or lamp loads. |
| IL (max) | 80mA - Maximum gate-triggered current needed to initiate latching; guarantees turn-on even under worst-case temperature and aging conditions. |
Pinout & Package
Package: TO220AB (Type WX), molded plastic, matte tin-plated leads, UL 94V-0 rated, weight ≈ 2.08g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 (Main Terminal 1) | Anode of forward-conducting path; cathode of reverse-conducting path | Primary current return path in AC half-cycles; connected to load neutral or grounded side in common-anode configurations. |
| MT2 (Main Terminal 2) | Cathode of forward-conducting path; anode of reverse-conducting path | Main current input terminal; typically tied to AC line hot or phase conductor in standard triac switch layouts. |
| G (Gate) | Control electrode for bidirectional triggering | Accepts positive or negative pulses relative to MT1 to initiate conduction in quadrants I, II, or III; requires no polarity reversal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivation | Ensures long-term VDRM stability and resistance to humidity-induced leakage drift in humid or outdoor-rated enclosures. |
| Three-quadrant triggering only | Eliminates quadrant IV sensitivity, reducing susceptibility to noise-induced misfiring during zero-crossing transitions. |
| High dV/dt immunity (2000 V/µs) | Permits direct connection to inductive loads (e.g., universal motors) without mandatory RC snubbers, simplifying BOM and layout. |
| RoHS-compliant, halogen- and antimony-free | Meets EU RoHS 3 (2015/863/EU) and automotive change-control requirements; <900ppm Br, <900ppm Cl, <1000ppm Sb. |
| Junction temperature range | Rated for continuous operation from –40°C to +125°C - supports sealed, high-ambient environments like enclosed HVAC controllers. |
Applications
| Motor Speed Control | Heating System Regulation |
|---|---|
|
Use Scenario: Variable-speed control of universal motors in corded electric drills and power saws. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered by zero-crossing optocoupler and phase-delayed gate pulse. Use Value: Delivers precise torque/speed response across 0–100% load range while maintaining <1.6V conduction drop and thermal stability at 12A RMS. |
Use Scenario: Proportional power delivery to resistive heating elements in coffee machines and industrial ovens. IC Role / Device Role / Timing Role: Phase-angle controlled AC switch synchronized to line frequency for smooth thermal ramp-up. Use Value: Enables fine-grained power resolution (via adjustable firing angle) with 50mA IH3 ensuring stable hold at low-power idle states. |
| Fan Speed Regulation | Light Dimming |
|
Use Scenario: Energy-efficient airflow control in HVAC blowers and kitchen exhaust fans. IC Role / Device Role / Timing Role: AC mains switch modulated via microcontroller-generated gate timing to adjust average power. Use Value: Supports quiet, stepless speed adjustment with 2000 V/µs dV/dt margin against commutation spikes from brushless DC fan back-EMF. |
Use Scenario: Leading-edge dimming of incandescent and halogen lamps in residential lighting systems. IC Role / Device Role / Timing Role: Bidirectional switching element in TRIAC-based dimmer PCBs with RC phase-shift network. Use Value: Maintains flicker-free dimming down to 5% brightness using 35mA IGT and 80mA IL3 to ensure reliable low-level conduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TRIAC-based AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BTB12-800BW | Same 12A/800V rating; higher IGT (50mA max); lower dV/dt (1000 V/µs); TO220AB package. | Requires stronger gate drive; less robust in high-EMI motor drive environments without snubber. | Prefer when gate drive margin is available and cost is primary constraint; verify dV/dt margin in final layout. |
| Littelfuse Q6012LH5TP | 12A/600V rating; 35mA IGT; higher IH (75mA); same TO220AB package; AEC-Q101 qualified. | Not suitable for 230V+ mains without derating; better for automotive HVAC blower control where qualification matters. | Select only for automotive-qualified designs operating ≤220V RMS; avoid in 240V global appliances. |
Compared with BTB12-800BW and Q6012LH5TP, T12M35T800UB offers superior dV/dt immunity and full 800V rating in a RoHS/halogen-free package - making it optimal for globally deployed 230–240V consumer and industrial AC control where reliability and regulatory compliance are co-prioritized.
Availability
T12M35T800UB is available at Aetrix Electronics and suitable for motor speed control, heating system regulation, fan speed regulation, and light dimming requiring stable component supply across global manufacturing sites.
Supply support for T12M35T800UB 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
This TRIAC belongs to Diodes' high-voltage, high-current power switching product line - engineered specifically for robust, thermally efficient AC mains control in consumer, industrial, and appliance applications.
FAQ
What is the maximum gate trigger current required for reliable turn-on at elevated temperature?
The T12M35T800UB specifies a maximum IGT of 35mA across all three quadrants at TA = +25°C. At TJ = +125°C, typical IGT increases to ~55mA (per Figure 7), but the device remains fully functional within its 35mA guaranteed max rating due to conservative design margin and glass passivation stability.
Can this TRIAC be used without a snubber circuit in inductive load applications?
Yes - its minimum dV/dt rating of 2000 V/µs at TJ = +125°C enables snubberless operation with many universal motors and solenoids. However, for highly inductive loads with rapid current interruption (e.g., transformer primaries), a small RC snubber (e.g., 100Ω + 100nF) is still recommended to limit voltage overshoot beyond 800V.
Is T12M35T800UB qualified for automotive applications?
No - while RoHS- and "Green"-compliant, it is not AEC-Q101 qualified. Diodes explicitly states that automotive-grade variants require PPAP capability and IATF 16949 manufacturing; this part is intended for industrial and consumer applications per DS45509.
How does the holding current (IH) vary with junction temperature?
Holding current increases with temperature: IH3 is 50mA max at +25°C and rises to ~65mA at +125°C (per Figure 8). This ensures stable conduction under worst-case thermal conditions, but designers must verify minimum load current exceeds IH across the full operating temperature range.
T12M35T800UB 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)
T12M35T800UB FAQ
1.How can I place an order for T12M35T800UB through Aetrix?
Please submit a Request for Quotation (RFQ) for T12M35T800UB 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 T12M35T800UB reliable?
The price and inventory of T12M35T800UB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T12M35T800UB is usually 5 days.
3.What payment methods are accepted for T12M35T800UB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T12M35T800UB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T12M35T800UB?
T12M35T800UB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T12M35T800UB 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 T12M35T800UB?
For technical support, including T12M35T800UB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T12M35T800UB requirements.
6.How does Aetrix verify that T12M35T800UB is sourced from the original manufacturer or authorized distributors?
All T12M35T800UB 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 T12M35T800UB meets industry standards.
7.What is the process for return or replacement of T12M35T800UB?
All T12M35T800UB units undergo pre-shipment inspection (PSI). If there is an issue with T12M35T800UB, 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 T12M35T800UB part is unused and in its original packaging.
Return procedure for T12M35T800UB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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