T850-8G

Overview

The T850-8G is an 8 A Snubberless triac manufactured by STMicroelectronics, designed for general-purpose AC switching applications. It features a repetitive peak off-state voltage (VDRM) of 800 V and operates within a junction temperature range of -40 °C to +125 °C. The device exhibits an on-state voltage of 1.55 V at rated current and maintains a maximum holding current of 75 mA. Triggering characteristics include a gate trigger voltage of 1.2 V and a gate trigger current of 50 mA. Packaged in a D2PAK-3 surface-mount format, it supports non-repetitive surge currents up to 80 A with a leakage current of 5 µA under blocking conditions.

Feature Summary

• Snubberless design optimized for high commutation performance on inductive loads
• Logic level interface capability for direct connection to low-power drivers such as microcontrollers
• Surface-mount D2PAK package construction for automated assembly integration

Applications

• Static relay ON/OFF control functions
• Heating regulation systems
• Induction motor starting circuits
• Phase control operation in light dimmers
• Motor speed controllers

Procurement Notes

Verify the specific ordering suffix against official STMicroelectronics documentation to confirm exact electrical ratings and packaging configuration. Ensure compatibility with RoHS standards and check for any recent lifecycle status updates or alternative package options before finalizing procurement plans.

Selection Notes

Select this component when high dV/dt immunity and robust turn-off commutation are required for inductive loads without external snubber circuits. Confirm that the 800 V blocking voltage and 8 A RMS current ratings exceed the application's peak operational demands while maintaining thermal margins within the specified junction temperature limits.

Part Context

This device belongs to the T850 series of Snubberless triacs from STMicroelectronics. The series provides solutions for AC power switching where simplified circuit design and improved reliability on reactive loads are prioritized over traditional thyristor implementations requiring external protection networks.

Replacement Considerations

Consult official substitution guides for equivalent Snubberless triacs with matching 8 A current and 800 V voltage ratings. Verify pinout compatibility and thermal resistance specifications before replacing the original component in existing designs.