BS170 Small Signal MOSFET 500 mA, 60 Volts N−Channel TO−92 (TO−226)
Used in our beacons as the output FET and/or amplifier. Also makes a good level switch. Good for up to 250mW or even slightly more at HF
Do NOT use the substitute 2N7000 !! It is not pin compatible and can ruin your PCB.