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STMicroelectronics T1235T-8G
- Part No.:
- T1235T-8G
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
T1235T-8G.pdf
- Description:
- TRIAC ALTERNISTOR 800V 12A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,859
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Product details
Overview
T1235T-8G from STMicroelectronics is a snubberless 12 A, 800 V RMS triac in D²PAK package, designed for high-commutation AC line switching in three-quadrant operation. It delivers 900 V non-repetitive surge voltage rating, 100 A/µs critical di/dt, and operates up to 150 °C junction temperature-enabling robust motor control and heating applications without external snubber circuits.
For engineers reviewing the T1235T-8G datasheet, T1235T-8G pinout, T1235T-8G application, or T1235T-8G equivalent, key selection criteria include verified dV/dt immunity (≥1000 V/µs at 150 °C), (dl/dt)c ≥6 A/ms at 150 °C, gate trigger current ≤35 mA, thermal resistance Rth(j-c) ≤1.6 °C/W, and D²PAK mounting compatibility with FR4 PCBs.
Technical Context
This triac supports phase-angle and zero-crossing AC switching in industrial and appliance-grade loads. Its three-quadrant operation eliminates gate sensitivity in QII, while high static dV/dt (≥1000 V/µs at 150 °C) prevents false triggering under fast transients.
The device achieves snubberless operation by combining high dynamic commutation margin (dl/dt)c ≥12 A/ms at 125 °C and low on-state voltage (VTM ≤1.6 V at 25 °C). Its D²PAK package provides direct heatsink interface via non-insulated tab and meets UL94-V0 flammability and Ecopack®2 environmental compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A RMS - supports continuous AC load currents up to 12 A at Tc = 124 °C without derating |
| VDRM / VRRM | 800 V at Tj = 125 °C - enables reliable blocking in 230 VAC mains with safety margin |
| VDSM / VRSM | 900 V non-repetitive - withstands lightning-induced surges and inductive kickback |
| (dl/dt)c | 6 A/ms minimum at Tj = 150 °C - ensures clean turn-off in high-temperature motor control |
| dV/dt | 1000 V/µs minimum at Tj = 150 °C - suppresses false triggering during fast line transients |
| Rth(j-c) | ≤1.6 °C/W - allows efficient thermal transfer to heatsink, enabling compact thermal design |
| IGT | ≤35 mA max - compatible with standard microcontroller GPIO or optocoupler drivers |
Pinout & Package
Package: D²PAK (TO-263), surface-mount, non-insulated metal tab (A2), UL94-V0 compliant, RoHS and halogen-free (Ecopack®2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A2 | Anode 2 | Main current terminal; electrically connected to exposed metal tab for direct heatsinking |
| A1 | Anode 1 | Main current terminal; referenced to A2 for bidirectional conduction path |
| G | Gate | Trigger input; controls conduction onset in quadrants I, II, and III with ≤35 mA drive |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Validated for use without RC snubber when (dV/dt)c > 20 V/µs and (dl/dt)c limits are observed |
| Three-quadrant triggering | Gate insensitive in quadrant II - reduces false turn-on risk in asymmetric AC waveforms |
| Extended junction temperature | Rated for continuous operation up to 150 °C - increases thermal headroom in enclosed appliances |
| High surge capability | 90 A non-repetitive surge (tp = 20 ms) - handles motor startup inrush and heater cold-resistance surges |
| Low on-state voltage | VTM ≤1.6 V at 25 °C and ≤0.85 V at 150 °C - minimizes conduction loss and self-heating |
Applications
| Motor Control | Heating Control |
|---|---|
|
Use Scenario: Speed and direction control of universal motors in power tools and vacuum cleaners. IC Role / Device Role / Timing Role: Bidirectional AC switch performing phase-angle control with precise gate timing. Use Value: Eliminates snubber components, reducing BOM count and board space while maintaining commutation reliability at 150 °C ambient. |
Use Scenario: Power regulation in electric ovens, water heaters, and HVAC auxiliary heating elements. IC Role / Device Role / Timing Role: Zero-crossing or phase-controlled on/off switch managing resistive load power delivery. Use Value: High VDSM (900 V) withstands voltage spikes during thermostat cycling; low Rth(j-c) enables direct heatsink mounting for stable thermal performance. |
| Lighting Dimming | Inrush Limiting |
|
Use Scenario: Leading-edge dimming of incandescent and halogen lamps in residential lighting systems. IC Role / Device Role / Timing Role: Phase-angle controlled triac delivering variable RMS voltage to lamp filament. Use Value: High dV/dt immunity (≥1000 V/µs at 150 °C) prevents misfiring during rapid dimmer transitions and EMI noise. |
Use Scenario: Controlled turn-on of large capacitive or transformer-coupled inputs in SMPS and audio amplifiers. IC Role / Device Role / Timing Role: Soft-start switch limiting peak inrush current using delayed phase-angle conduction. Use Value: Verified (dl/dt)c ≥12 A/ms at 125 °C ensures reliable turn-off after inrush pulse, preventing latch-up. |
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 |
|---|---|---|---|
| BTB12-800CW | 12 A, 800 V, but rated only to 125 °C Tj; lower (dl/dt)c (8 A/ms @ 125 °C); requires snubber in most designs | Limited to lower-temperature environments; not suitable for sealed enclosures above 105 °C ambient | Select if cost-sensitive and thermal margin >25 °C exists; verify snubber design per load type |
| MAC12N8G | 12 A, 800 V, 150 °C rated, but only two-quadrant (QI/QIII); lower dV/dt (800 V/µs @ 150 °C) | Not usable in QII-triggered circuits (e.g., certain dimmer topologies); higher false-trigger risk on noisy lines | Choose only for QI/QIII-only control; avoid where asymmetrical waveform immunity is required |
Compared with BTB12-800CW and MAC12N8G, the T1235T-8G uniquely combines 150 °C operation, three-quadrant triggering, and validated snubberless performance-making it the only option for thermally constrained, high-reliability AC switching where gate noise immunity and surge resilience are critical.
Availability
T1235T-8G is available at Aetrix Electronics and suitable for motor control, heating regulation, and lighting dimming applications requiring stable component supply, long-term lifecycle support, and consistent D²PAK packaging across production batches.
Supply support for T1235T-8G 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, microcontrollers, sensors, and analog ICs for industrial, automotive, and consumer markets.
The T1235T-8G belongs to ST's Snubberless™ Triac product line, engineered specifically for high-reliability, high-temperature AC switching in space-constrained and thermally demanding applications such as white goods and power tools.
FAQ
Is T1235T-8G truly snubberless in all applications?
No-it is snubberless only when operating within defined limits: (dV/dt)c > 20 V/µs and (dl/dt)c within datasheet-specified margins. Applications with highly inductive loads or unfiltered line noise may still require minimal snubbing. The device's 1000 V/µs dV/dt immunity at 150 °C significantly reduces snubber dependency compared to standard triacs.
Can T1235T-8G be mounted directly to a heatsink?
Yes-the D²PAK package features a non-insulated metal tab (A2) that serves as both electrical anode and thermal interface. Mounting requires electrically isolating hardware (e.g., mica washer + thermal paste) only if the heatsink is grounded or at a different potential than A2.
What is the maximum allowable gate drive current for reliable lifetime?
The absolute maximum peak gate current is 4 A (tp = 20 µs, Tj = 150 °C), but for long-term reliability, ST recommends limiting repetitive IGM to ≤1 A with <100 ns rise time. Exceeding this risks gate metallization fatigue and gradual IGT drift over 10,000+ cycles.
Does T1235T-8G support zero-crossing switching?
Yes-it functions reliably in zero-crossing mode due to its low latching current (IL ≤80 mA in QII) and high dV/dt immunity. However, zero-crossing operation must be implemented externally via controller logic; the triac itself has no built-in zero-crossing detection circuitry.
T1235T-8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- 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):
- 95A, 90A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 40 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
T1235T-8G FAQ
1.How can I place an order for T1235T-8G through Aetrix?
Please submit a Request for Quotation (RFQ) for T1235T-8G 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 T1235T-8G reliable?
The price and inventory of T1235T-8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1235T-8G is usually 5 days.
3.What payment methods are accepted for T1235T-8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1235T-8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T1235T-8G?
T1235T-8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T1235T-8G 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 T1235T-8G?
For technical support, including T1235T-8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1235T-8G requirements.
6.How does Aetrix verify that T1235T-8G is sourced from the original manufacturer or authorized distributors?
All T1235T-8G 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 T1235T-8G meets industry standards.
7.What is the process for return or replacement of T1235T-8G?
All T1235T-8G units undergo pre-shipment inspection (PSI). If there is an issue with T1235T-8G, 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 T1235T-8G part is unused and in its original packaging.
Return procedure for T1235T-8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T1235T-8G Tags
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