BUY MM4049 https://www.utsource.net/itm/p/1861480.html
RF Small Signal Bipolar Transistor, 0.03A I(C), 1-Element, Ultra High Frequency Band, Silicon, PNP, TO-72
Description: Quad 2-Input NAND Gate Features: Low Power Consumption High Speed Low Input Current High Noise Immunity High Output Current Low Input Capacitance High Output Voltage High Input Impedance Low Output Impedance High Noise Immunity High Output Voltage Low Input Capacitance High Input Impedance Low Output Impedance Application: Digital Logic Switching Timing Pulse Generation Signal Routing Data Processing Signal Conditioning Control Circuits Interface Circuits Memory Circuits (For reference only)