T1235T-8I

Triacs Overview

The T1235T-8I is a 12 A Snubberless Triac from STMicroelectronics, designed for general-purpose AC switching applications requiring high commutation capability. It supports on/off or phase angle control functions and operates without an external snubber RC circuit when defined limits are respected. The device features a TO-220AB insulated package with built-in ceramic tab insulation, certified to UL1557 at 2.5 kV RMS. Key electrical parameters include an RMS current of 12 A, a rated repetitive off-state voltage (VDRM) of 800 V, and a non-repetitive peak on-state current of 90 A or 95 A. It maintains a maximum junction temperature of 150 °C, with a holding current of 40 mA max, gate trigger voltage of 1.3 V, and gate trigger current of 35 mA.

Triacs Feature Summary

• Snubberless operation eliminates the need for external RC circuits under specified conditions
• High static dV/dt immunity prevents false turn-on events
• Enhanced dynamic turn-off commutation (dl/dt)c improves performance in high-temperature environments
• TO-220AB insulated package provides 2.5 kV RMS isolation and UL1557 certification

Triacs Applications

• General purpose AC switching
• On/off control circuits
• Phase angle control applications

Triacs Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number T1235T-8I with official STMicroelectronics documentation. Confirm RoHS compliance and ECOPACK 2 environmental grading through datasheet specifications. Ensure the TO-220AB insulated package variant matches design requirements for tab insulation and UL1557 certification before integration.

Triacs Selection Notes

Select this component for designs requiring high commutation capability and thermal stability up to 150 °C. The insulated package is suitable for applications needing galvanic isolation between the heatsink and circuit ground. Verify that the 800 V blocking voltage and 12 A RMS current ratings exceed the maximum operational loads to ensure reliable performance within the defined snubberless operating limits.

Triacs Part Context

This triac belongs to the T-Series Snubberless family, which emphasizes high static dV/dt and dynamic commutation capabilities. It shares functional similarities with other T-series devices like the T1635T-8I but differs in current rating and package insulation. The series is characterized by its ability to operate without external snubber networks, simplifying circuit design for AC power control systems.

Triacs Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult official STMicroelectronics replacement guides or equivalent technical specifications from authorized distributors to identify compatible alternatives.