The TK1Q90A from Toshiba is a MOSFET with Continous Drain Current 1 A, Drain Source Resistance 6700 to 900 Milliohm, Drain Source Breakdown Voltage 900 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for TK1Q90A can be seen below.