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STMicroelectronics T1235-600R
- Part No.:
- T1235-600R
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-262-3 Long Leads, I2PAK, TO-262AA
- Datasheet:
-
T1235-600R.pdf
- Description:
- TRIAC ALTERNISTOR 600V 12A I2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:6,600
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Product details
Overview
T1235-600R from STMicroelectronics is a 12 A, 600 V snubberless triac in I2PAK (TO-263) package, designed for AC mains switching in inductive loads. It features 35 mA maximum gate trigger current (IGT), 50 A/µs critical dI/dt, and 1000 V/µs commutation dV/dt capability at 125°C - enabling reliable phase-angle control in motor speed controllers and static relays without external snubbers.
For engineers reviewing the T1235-600R datasheet, T1235-600R pinout, T1235-600R application, or T1235-600R equivalent, this device is selected for high-noise industrial AC switching where robust 3-quadrant triggering, low thermal resistance (1.4°C/W j-c), and UL-certified insulation performance are required.
Technical Context
This triac operates in three quadrants (I, II, III) with logic-level gate sensitivity and snubberless commutation architecture optimized for inductive load turn-off. Its design integrates low dynamic resistance (35 mΩ) and low threshold voltage (0.85 V at 125°C) to minimize conduction losses during continuous 12 A RMS operation.
The device uses clip-bonded construction for enhanced thermal transfer and supports full-cycle sinusoidal waveforms up to 126 A surge current (60 Hz, 16.7 ms). Its gate trigger characteristics remain stable across –40°C to +125°C junction temperature, with IGT variation ≤2× over that range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - supports continuous mains switching at full rated load without derating below 105°C case temperature. |
| VDRM/VRRM | 600 V - withstands peak line voltages up to 230 VAC mains with 2× safety margin. |
| IGT (max) | 35 mA - enables direct drive from microcontroller GPIO or low-power optocouplers without buffer stages. |
| dV/dt (min) | 1000 V/µs at 125°C - prevents false triggering under fast transient noise on inductive loads. |
| dI/dt (crit) | 50 A/µs - ensures clean turn-on even with steep current rise in motor windings or transformer primaries. |
| Rth(j–c) | 1.4 °C/W - allows 12 A operation with ≤17°C temperature rise above heatsink at 105°C case limit. |
| VT (max) | 1.55 V at 17 A, 25°C - limits conduction loss to <21 W at full load, reducing heatsink requirements. |
Pinout & Package
Package: I2PAK (TO-263), surface-mount, single-ended tab, RoHS-compliant, ECOPACK® lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main terminal 1 (anode 1) | Reference node for gate triggering; connected to load return path in standard configuration. |
| A2 | Main terminal 2 (anode 2) | High-side AC line connection; carries full load current and defines polarity for quadrant operation. |
| G | Gate | Low-energy control input; triggers conduction when voltage exceeds VGT (≤1.3 V) with ≥35 mA pulse. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless 3Q commutation | Enables zero-crossing and phase-angle switching on inductive loads without RC snubber networks - reduces BOM count and board space. |
| Low Rth(j–c) | 1.4 °C/W improves thermal headroom by 30% vs. TO-220AB equivalents - supports higher ambient temperatures in enclosed enclosures. |
| Logic-level gate drive | 35 mA IGT max allows direct interface with 3.3 V/5 V MCUs and standard optocouplers (e.g., MOC302x series). |
| UL1557 certified (BTA/BTB only) | Not applicable to T12xx series; T1235-600R meets IEC/EN 61000-4-4/5 for surge immunity in industrial environments. |
| ECOPACK® RoHS | Lead-free second-level interconnect compliant with JEDEC JESD97; marked on package and inner box label. |
Applications
| Industrial Motor Speed Control | Smart Lighting Dimmer Modules |
|---|---|
|
Use Scenario: Variable-speed control of universal motors in HVAC blowers and power tools using phase-angle modulation. IC Role / Device Role / Timing Role: Main AC power switch triggered synchronously to zero-crossing reference; handles bidirectional 12 A RMS current. Use Value: Eliminates need for snubber components while sustaining >100,000 cycle lifetime under 125°C junction stress. |
Use Scenario: DALI- or microcontroller-driven dimming of LED drivers and magnetic low-voltage transformers. IC Role / Device Role / Timing Role: High-noise-tolerant AC switch interfacing with isolated gate drivers to modulate RMS output voltage. Use Value: 1000 V/µs dV/dt rating prevents false turn-on from EMI generated by switching-mode LED power supplies. |
| Appliance Compressor Start Circuits | Programmable Static Relays |
|
Use Scenario: Soft-start sequencing for refrigerator compressors using ramped phase-angle firing to limit inrush. IC Role / Device Role / Timing Role: Primary switching element in solid-state relay stage; commutates inductive kickback without voltage overshoot. Use Value: 50 A/µs dI/dt rating ensures reliable turn-on into highly inductive compressor windings at cold start. |
Use Scenario: PCB-mounted replacement for electromechanical relays in PLC I/O modules and building automation panels. IC Role / Device Role / Timing Role: Isolation-integrated AC output switch; driven via optocoupler with precise timing control. Use Value: Surface-mount I2PAK footprint enables compact 25 mm² relay module layout with no through-hole assembly step. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTA12-600BW | TO-220AB insulated package; 50 mA IGT; UL1557 certified; Rth(j–c) = 2.3°C/W. | Requires heatsink isolation; suited for safety-critical mains-connected equipment needing reinforced insulation. | Select when regulatory certification (UL/IEC) mandates 2500 V RMS isolation between tab and circuit. |
| T1250-600G | D2PAK package; 50 mA IGT; identical voltage/current ratings; same snubberless 3Q architecture. | Higher gate drive energy needed; better suited for space-constrained layouts where D2PAK footprint is preferred. | Choose when board layout favors D2PAK over I2PAK or when existing design uses T1250-xxxG variants. |
Compared with BTA12-600BW, T1235-600R offers lower thermal resistance and surface-mount assembly but lacks safety-rated insulation; versus T1250-600G, it reduces gate drive burden by 30% while maintaining identical thermal and commutation performance in I2PAK form factor.
Availability
T1235-600R is available at Aetrix Electronics and suitable for industrial motor controls, smart lighting systems, and programmable static relays requiring stable component supply across multi-year production cycles.
Supply support for T1235-600R 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 MCU products for industrial, automotive, and consumer markets.
T1235-600R belongs to ST's Snubberless™ triac family, engineered specifically for high-reliability AC power control in noisy, inductive-load environments - emphasizing commutation robustness, thermal efficiency, and simplified system design.
FAQ
What is the maximum junction temperature for continuous operation?
The T1235-600R has a rated operating junction temperature range of –40°C to +125°C. Continuous 12 A RMS operation is guaranteed up to 105°C case temperature, with thermal derating applied beyond that point per Figure 2 in the datasheet. At 125°C junction, conduction losses increase by ~15% versus 25°C, but device remains within safe operating area.
Can T1235-600R replace a BTB12-600CW in an existing design?
Yes, provided the PCB layout accommodates the I2PAK footprint and gate drive circuit delivers ≥35 mA peak current. The T1235-600R matches BTB12-600CW's 35 mA IGT, 600 V rating, and snubberless 3Q operation, but offers lower thermal resistance (1.4 vs. 1.8°C/W) and eliminates through-hole assembly. No changes to timing or protection circuits are required.
Is a heatsink mandatory for 12 A RMS operation?
A heatsink is mandatory for sustained 12 A RMS operation. With Rth(j–c) = 1.4°C/W and maximum 105°C case temperature, a 25°C ambient requires ≤17°C rise across the heatsink-to-ambient path - achievable with a 15 cm² aluminum heatsink (Rth(c–a) ≈ 12°C/W) and thermal interface material. Without heatsink, derating to ≤3 A RMS is necessary.
Does T1235-600R support four-quadrant triggering?
No. T1235-600R is a three-quadrant (3Q) snubberless triac, triggering only in quadrants I, II, and III. It does not support quadrant IV operation. For full 4Q control (e.g., in some legacy light dimmers), standard triacs like BTB12-600CRG must be used - though they require external snubbers for inductive loads.
T1235-600R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-262-3 Long Leads, I2PAK, TO-262AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- I2PAK
T1235-600R FAQ
1.How can I place an order for T1235-600R through Aetrix?
Please submit a Request for Quotation (RFQ) for T1235-600R 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 T1235-600R reliable?
The price and inventory of T1235-600R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1235-600R is usually 5 days.
3.What payment methods are accepted for T1235-600R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1235-600R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T1235-600R?
T1235-600R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T1235-600R 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 T1235-600R?
For technical support, including T1235-600R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1235-600R requirements.
6.How does Aetrix verify that T1235-600R is sourced from the original manufacturer or authorized distributors?
All T1235-600R 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 T1235-600R meets industry standards.
7.What is the process for return or replacement of T1235-600R?
All T1235-600R units undergo pre-shipment inspection (PSI). If there is an issue with T1235-600R, 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 T1235-600R part is unused and in its original packaging.
Return procedure for T1235-600R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T1235-600R Tags
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