The MMFTN138 from Diotec Semiconductor is a MOSFET with Continous Drain Current 0.22 A, Drain Source Resistance 3500 to 6000 milliohm, Drain Source Breakdown Voltage 50 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 0.8 to 1.6 V. Tags: Surface Mount. More details for MMFTN138 can be seen below.