T850-6G

Overview

The T850-6G is a high-temperature bidirectional triac manufactured by STMicroelectronics, designed for general-purpose AC switching applications. It operates in the D2PAK surface-mount package and supports a maximum operating temperature of +150°C. Key electrical parameters include an RMS on-state current (IT(RMS)) of 8 A, a repetitive peak off-state voltage (VDRM) of 600 V, and a non-repetitive peak on-state current of 84 A. The device features a maximum on-state voltage of 1.5 V, a holding current (Ih) of up to 75 mA, and a gate trigger voltage (Vgt) of 1 V with a gate trigger current (Igt) of 50 mA. It exhibits a leakage current of 5 uA at VDRM and functions within a temperature range of -40°C to +150°C.

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
• High thermal stability suitable for demanding environments with operation up to +150°C

Applications

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

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or official channels. Confirm RoHS compliance and REACH SVHC status via the manufacturer's datasheet before integration. Ensure the D2PAK package variant matches the specific PCB footprint requirements. Cross-reference the ordering suffix to confirm the exact electrical characteristics and packaging type intended for the design.

Selection Notes

Select this component when designing AC switching circuits requiring robust handling of inductive loads without external snubber networks. The logic-level gate drive simplifies interface design with modern microcontrollers. Verify that the 8 A RMS current rating accommodates the load's steady-state requirements and that the 600 V blocking voltage exceeds the peak line voltage plus transient spikes in the target application environment.

Part Context

The T850-6G belongs to the T850H series of Snubberless Triacs from STMicroelectronics. This series is engineered to replace traditional thyristors in applications where high dv/dt immunity is critical. The T850H designation indicates high-temperature capability, distinguishing it from standard industrial triacs. It shares functional similarities with the BTA and BTB series but offers specific thermal and packaging advantages for surface-mount implementations.

Replacement Considerations

Direct replacements within the STMicroelectronics portfolio include other members of the T850H series with compatible voltage ratings, such as the T850H-8G for higher voltage requirements. Designers should verify pinout compatibility and thermal resistance values when substituting components to ensure adequate heat dissipation in the existing enclosure.