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STMicroelectronics T1235-600G
- Part No.:
- T1235-600G
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
T1235-600G.pdf
- Description:
- TRIAC ALTERNISTOR 600V 12A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:757
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Product details
Overview
T1235-600G from STMicroelectronics is a Snubberless™ 3-quadrant logic-level triac in D²PAK package, rated for 12 A RMS on-state current and 600 V repetitive peak off-state voltage, with 35 mA maximum gate trigger current (IGT), designed for reliable AC mains switching in inductive load applications such as motor speed control and heating regulation.
For engineers reviewing the T1235-600G datasheet, T1235-600G pinout, T1235-600G application, or T1235-600G equivalent, this device offers high commutation capability (dV/dt = 500 V/µs, (dl/dt)c = 6.5 A/ms), insulated thermal performance (Rth(j-c) = 1.4 °C/W), and UL1557-certified isolation - critical for industrial-grade phase-control designs requiring snubber-free operation.
Technical Context
This triac operates in three quadrants (I, II, III) and features internal ceramic insulation enabling 2500 VRMS isolated tab rating. Its Snubberless™ architecture eliminates external RC snubbers by sustaining high dV/dt (500 V/µs) and critical commutation current rate (6.5 A/ms at 0.1 V/µs).
Designed for mains-frequency AC switching, it supports phase-angle control with low IGT (35 mA max) and low holding current (IH ≤ 35 mA), enabling direct drive from microcontroller GPIOs without buffer stages in LED dimmer and appliance motor controller designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Supports continuous AC load currents up to 12 A RMS in full-sine-wave operation. |
| VDRM / VRRM | 600 V - Blocks 600 V repetitive peak off-state voltage, suitable for 230 VAC mains with safety margin. |
| IGT (max) | 35 mA - Low gate trigger current enables direct drive from 3.3 V/5 V logic outputs without amplification. |
| dV/dt (min) | 500 V/µs - High voltage transient immunity prevents false triggering in noisy inductive environments. |
| (dl/dt)c | 6.5 A/ms at 0.1 V/µs - Sustains rapid current decay during zero-crossing commutation without snubber. |
| Rth(j-c) | 1.4 °C/W - Efficient junction-to-case thermal path enables high power dissipation with minimal heatsink. |
| VTM (max) | 1.55 V at 17 A - Low on-state voltage minimizes conduction losses and self-heating under load. |
Pinout & Package
D²PAK (TO-263) surface-mount package with insulated tab rated at 2500 VRMS; thermally optimized for PCB copper area mounting (S = 1–4 cm²); ECOPACK2® compliant, halogen-free, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate triggering; connected to load return or neutral side in AC circuits. |
| A2 (MT2) | Main Terminal 2 | High-side AC line connection; carries full load current and defines polarity reference for gate signals. |
| G | Gate | Control input; triggers conduction when voltage ≥ 1.3 V and current ≥ 35 mA relative to A1. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless™ operation | Eliminates external RC snubber components in inductive loads (e.g., motors, transformers), reducing BOM count and board space. |
| UL1557 certification | Insulated tab meets reinforced insulation requirements (file E81734), enabling safe use in Class I/II appliances. |
| 3-quadrant triggering | Operates in quadrants I, II, and III only - suppresses quadrant IV noise sensitivity and improves EMI robustness. |
| Logic-level gate drive | 35 mA IGT allows direct interface with MCU GPIOs or optocouplers without discrete transistor buffers. |
| Low thermal resistance | Rth(j-c) = 1.4 °C/W enables >10 W power dissipation with modest heatsinking on FR4 PCBs. |
Applications
| Motor Speed Control | LED Dimming System |
|---|---|
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 synchronously with zero-crossing detection to adjust conduction angle per half-cycle. Use Value: Enables precise torque/speed regulation without snubber components, reducing system cost and improving reliability over standard triacs. | Use Scenario: Leading-edge dimming of AC-powered LED drivers in residential lighting fixtures. IC Role / Device Role / Timing Role: High-dV/dt tolerant triac delivering clean turn-on/turn-off transitions despite LED driver capacitive input. Use Value: Prevents false triggering from fast voltage transients, ensuring flicker-free dimming across full 0–100% range. |
| Heating Regulation | Static Relay Replacement |
Use Scenario: Proportional ON/OFF control of resistive heating elements in HVAC systems and industrial ovens. IC Role / Device Role / Timing Role: Solid-state switch replacing electromechanical relays; driven by PWM-modulated gate pulses at line frequency. Use Value: Achieves silent, wear-free operation with 100,000+ cycle lifetime and no contact arcing risk. | Use Scenario: Compact, surface-mount replacement for through-hole relays in programmable logic controllers (PLCs) and building automation panels. IC Role / Device Role / Timing Role: Isolated AC output stage providing galvanic separation between control logic and 230 VAC loads. Use Value: Integrates 2500 VRMS isolation and 12 A switching into single D²PAK footprint, cutting assembly time and inventory SKUs. |
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 |
|---|---|---|---|
| BTA12-600CW | Same 12 A/600 V rating and 35 mA IGT, but TO-220AB insulated package with Rth(j-c) = 2.3 °C/W. | Requires mechanical mounting and screw heatsinking; less suitable for high-density SMT layouts. | Select when legacy through-hole assembly or higher creepage/clearance is required. |
| T1250-600G | Higher 50 mA IGT, same D²PAK package and voltage rating; lower dV/dt (1000 V/µs) but identical (dl/dt)c. | Less sensitive gate enables robust operation in high-noise factory environments but needs stronger drive. | Select when gate drive circuitry can supply ≥50 mA and immunity to ESD/transient coupling is prioritized. |
Compared with BTA12-600CW and T1250-600G, T1235-600G uniquely balances low gate drive demand (35 mA), high dV/dt immunity (500 V/µs), and surface-mount scalability - making it optimal for space-constrained, microcontroller-driven AC control modules.
Availability
T1235-600G is available at Aetrix Electronics and suitable for motor speed control, LED dimming systems, heating regulation, and static relay replacement requiring stable component supply and long-term industrial lifecycle support.
Supply support for T1235-600G 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, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for automotive, industrial, and consumer markets.
The T12xx series belongs to ST's Snubberless™ triac product line, engineered specifically for robust, snubber-free AC power control in inductive and capacitive loads - targeting appliance, industrial automation, and smart home applications demanding high reliability and regulatory compliance.
FAQ
What is the maximum junction temperature for continuous operation of T1235-600G?
The T1235-600G has an operating junction temperature range of –40 °C to +125 °C. Continuous operation must maintain Tj ≤ 125 °C, achievable with proper PCB copper area (≥2 cm²) and ambient temperature ≤ 75 °C, based on Rth(j-a) ≈ 45 °C/W for D²PAK on FR4.
Does T1235-600G require a heatsink in typical 12 A applications?
At 12 A RMS with VTM ≈ 1.55 V, conduction loss is ~18.6 W. With Rth(j-c) = 1.4 °C/W, case temperature rise is ~26 °C - so a heatsink is not mandatory if PCB copper area provides sufficient thermal spreading (e.g., ≥10 cm² copper pour). For enclosed or high-ambient environments, a small clip-on heatsink is recommended.
Can T1235-600G replace a standard 4-quadrant triac like BT139-600 in existing designs?
No - T1235-600G is a 3-quadrant device (quadrants I, II, III only) and lacks quadrant IV triggering. It cannot directly replace 4-quadrant triacs in circuits relying on negative gate-to-A1 pulses during negative half-cycles. Gate drive timing and polarity must be redesigned to match its 3Q operation.
Is the insulated tab of T1235-600G rated for functional or reinforced insulation?
The insulated tab is rated for reinforced insulation per UL1557 (file E81734), supporting 2500 VRMS isolation. This qualifies it for use in double-insulated (Class II) appliances and safety-critical AC mains interfaces where basic insulation would be insufficient.
T1235-600G 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:
- 600 V
- Current - On State (It (RMS)) (Max):
- 12 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 120A, 126A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 35 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
T1235-600G FAQ
1.How can I place an order for T1235-600G through Aetrix?
Please submit a Request for Quotation (RFQ) for T1235-600G 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 T1235-600G reliable?
The price and inventory of T1235-600G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1235-600G is usually 5 days.
3.What payment methods are accepted for T1235-600G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1235-600G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T1235-600G?
T1235-600G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T1235-600G 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 T1235-600G?
For technical support, including T1235-600G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1235-600G requirements.
6.How does Aetrix verify that T1235-600G is sourced from the original manufacturer or authorized distributors?
All T1235-600G 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 T1235-600G meets industry standards.
7.What is the process for return or replacement of T1235-600G?
All T1235-600G units undergo pre-shipment inspection (PSI). If there is an issue with T1235-600G, 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 T1235-600G part is unused and in its original packaging.
Return procedure for T1235-600G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T1235-600G Tags
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Z0103NN5AA4
STMicroelectronics
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Littelfuse Inc.
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Z0103MNT1G
Littelfuse Inc.
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