This document describes the features and characteristics of Toshiba's bidirectional thyristor products SM8G45, SM8J45, SM8G45A, SM8J45A released on July 8, 2004. These products are designed for AC power control, with peak repetitive off-state voltage of 400, 600V, effective on-state current of 8A, and critical rate of rise of off-state voltage of 10V/μs (Min.) for general type or 4V/μs (Min.) for high sensitivity type. The products are packaged in TO-220AB, providing easy handling and installation.