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STMicroelectronics T1210T-8T
- Part No.:
- T1210T-8T
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T1210T-8T.pdf
- Description:
- TRIAC SENS GATE 800V 12A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:79
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Product details
Overview
T1210T-8T from STMicroelectronics is a 12 A, 800 V RMS logic-level triac in TO-220AB package, designed for phase-angle and on/off AC line switching. It features 10 mA gate trigger current (IGT), 900 V non-repetitive peak off-state voltage (VDSM), and three-quadrant operation for robust noise immunity in noisy industrial environments. Used in motor control, lighting dimming, and inrush limiting circuits where microcontroller direct drive is required.
For engineers reviewing the T1210T-8T datasheet, T1210T-8T pinout, T1210T-8T application, or T1210T-8T equivalent, key selection criteria include gate sensitivity (10 mA IGT), thermal resistance (1.3 °C/W j-c), dV/dt immunity (250 V/µs at 125 °C), and ECOPACK2 compliance for RoHS-constrained designs.
Technical Context
This triac operates across all four quadrants but is optimized for three-quadrant triggering (I, II, III), reducing false turn-on in high-noise AC mains environments. Its low 10 mA IGT enables direct interfacing with 3.3 V/5 V microcontrollers without external gate drivers.
It delivers 12 A RMS on-state current at 131 °C case temperature with 1.3 °C/W junction-to-case thermal resistance, supporting conduction angles down to 30° in phase-control applications. Critical dV/dt immunity reaches 250 V/µs at Tj = 125 °C with gate open, ensuring reliable blocking during fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Sustains full-sine AC load current up to 131 °C case temperature without derating. |
| VDRM/VRRM | 800 V - Blocks repetitive 50/60 Hz AC line surges up to 800 V at 125 °C junction temp. |
| IGT | 10 mA max - Gate trigger current compatible with standard MCU GPIO outputs. |
| dV/dt (min) | 250 V/µs - Immune to rapid voltage transients on AC line when gate is open. |
| Rth(j-c) | 1.3 °C/W - Enables efficient heatsinking for continuous 12 A operation with modest thermal interface. |
| VTM (max) | 1.55 V at 17 A - Low conduction loss reduces power dissipation and thermal stress in load path. |
| ECOPACK2 | Halogen-free, lead-free TO-220AB package compliant with EU RoHS Directive 2011/65/EU. |
Pinout & Package
TO-220AB package with isolated mounting tab (A2 terminal), standard through-hole footprint, and 0.4–0.6 N·m screw torque specification. Epoxy meets UL94 V0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate triggering; polarity defines quadrant behavior (A2 referenced to A1). |
| A2 (MT2) | Main Terminal 2 | Current return path; electrically isolated tab supports heatsink mounting without insulation kit. |
| G | Gate | Low-current control input; triggers conduction in quadrants I, II, and III only (not QIV). |
Key Features
| Feature | Design Value |
|---|---|
| Three-quadrant operation | Eliminates false triggering from negative gate pulses in noisy AC environments. |
| Logic-level gate drive | 10 mA IGT allows direct connection to 3.3 V/5 V MCUs without buffer stages. |
| High dV/dt immunity | 250 V/µs at 125 °C ensures stable blocking during line transients and commutation spikes. |
| Enhanced surge capability | 95 A non-repetitive surge (60 Hz, 16.7 ms) supports motor startup and lamp cold-inrush events. |
| Thermal efficiency | 1.3 °C/W Rth(j-c) enables compact heatsink design for 12 A continuous conduction. |
Applications
| AC Motor Speed Control | LED/CFL Dimming Circuit |
|---|---|
|
Use Scenario: Variable-speed control of universal motors in power tools and kitchen appliances using phase-angle modulation. IC Role / Device Role / Timing Role: Main AC power switch triggered by zero-crossing synchronized PWM to regulate RMS voltage delivered to motor winding. Use Value: Enables smooth speed ramp-up/down with 12 A current handling and 250 V/µs dV/dt immunity against commutation spikes. |
Use Scenario: Leading-edge dimming of LED drivers and compact fluorescent lamps in residential lighting systems. IC Role / Device Role / Timing Role: Bidirectional AC switch controlled by microcontroller-generated firing angle delay after zero-cross detection. Use Value: 10 mA gate sensitivity permits direct MCU drive; 800 V VDRM supports 230 VAC + 20% line tolerance. |
| Inrush Current Limiter | Overvoltage Crowbar Protection |
|
Use Scenario: Limiting inrush into capacitive input stages of SMPS and audio amplifiers during cold start. IC Role / Device Role / Timing Role: Soft-start switch bypassed after NTC warm-up or timed delay, conducting full AC cycle only after steady state. Use Value: 12 A IT(RMS) and 95 A surge rating absorb capacitor charging peaks without latch-up or thermal runaway. |
Use Scenario: Fast-acting crowbar protection for DC bus rails in industrial inverters and UPS systems. IC Role / Device Role / Timing Role: Triggered by overvoltage comparator output to short AC line and blow fuse or trip breaker. Use Value: 900 V VDSM withstands transient overvoltages; 100 A/µs dl/dt rating ensures reliable turn-on under fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT139-800R | 16 A IT(RMS), higher IGT (50 mA), same 800 V VDRM, TO-220 package. | Requires gate driver for MCU interfaces; better suited for higher-current loads with less sensitive control. | Select when >12 A RMS current is needed and gate drive capability exceeds 50 mA. |
| MAC12N8G | 12 A IT(RMS), 800 V VDRM, but 35 mA IGT and lower dV/dt (100 V/µs), TO-220AB. | Limited noise immunity in high-dV/dt environments; not recommended for unfiltered industrial mains. | Choose only for cost-sensitive, low-noise consumer applications with buffered gate drive. |
Compared with BT139-800R and MAC12N8G, the T1210T-8T uniquely balances 12 A current, 10 mA gate sensitivity, and 250 V/µs dV/dt immunity-enabling direct MCU control in harsh AC environments without added buffering or snubbing.
Availability
T1210T-8T is available at Aetrix Electronics and suitable for motor control, lighting dimming, and inrush current limiting applications requiring stable component supply and long-term industrial availability.
Supply support for T1210T-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, specializing in power discrete devices, analog ICs, and microcontrollers for industrial, automotive, and consumer markets.
The T1210T-8T belongs to ST's high-reliability logic-level triac product line, engineered specifically for direct microcontroller-driven AC power control in space- and cost-constrained industrial and appliance designs.
FAQ
Is the T1210T-8T compatible with 3.3 V microcontrollers?
Yes. With a maximum gate trigger current (IGT) of 10 mA and typical VGT of 1.3 V, the T1210T-8T can be directly driven by 3.3 V GPIO pins delivering ≥10 mA sink/source capability. No external transistor buffer is required under standard operating conditions.
What is the maximum allowable case temperature for continuous 12 A operation?
The datasheet specifies 12 A IT(RMS) at Tc = 131 °C. Operation above this temperature requires linear derating per Figure 2; at 100 °C case temperature, the device supports ~14.5 A RMS, while at 75 °C it supports ~16.2 A RMS.
Does the TO-220AB package require electrical isolation when mounted to a heatsink?
Yes. The A2 (MT2) terminal is connected to the metal tab, which serves as the main heatsink interface. Electrical isolation via mica washer or silicone pad is mandatory unless the heatsink is fully floating or referenced to MT2 potential.
Can the T1210T-8T replace a standard 4Q triac in existing designs?
It can replace 4Q triacs only in applications that do not rely on quadrant IV triggering. As a 3Q device, it blocks gate-triggered conduction when A2 is negative relative to A1-reducing susceptibility to noise but eliminating one triggering mode.
T1210T-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):
- 12 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 90A, 95A
- 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
T1210T-8T FAQ
1.How can I place an order for T1210T-8T through Aetrix?
Please submit a Request for Quotation (RFQ) for T1210T-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 T1210T-8T reliable?
The price and inventory of T1210T-8T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1210T-8T is usually 5 days.
3.What payment methods are accepted for T1210T-8T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1210T-8T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T1210T-8T?
T1210T-8T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T1210T-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 T1210T-8T?
For technical support, including T1210T-8T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1210T-8T requirements.
6.How does Aetrix verify that T1210T-8T is sourced from the original manufacturer or authorized distributors?
All T1210T-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 T1210T-8T meets industry standards.
7.What is the process for return or replacement of T1210T-8T?
All T1210T-8T units undergo pre-shipment inspection (PSI). If there is an issue with T1210T-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 T1210T-8T part is unused and in its original packaging.
Return procedure for T1210T-8T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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