BUY RN4904 https://www.utsource.net/itm/p/11278548.html
RN4904 NPN+PNP Complex Bipolar Digital Transistor -50V/50V -100mA/100mA 80 200mW/0.2W SOT-363/US6/SC70-6 marking VD switching inverting interface driver circuit
The RN4904 is a low power, low voltage CMOS device from Microchip. It is a single-channel, low-power, low-voltage, low-noise amplifier designed for use in portable and battery-powered applications. It features a wide gain range of 0.1 to 10 V/V, a low noise figure of 0.9 nV/√Hz, and a wide bandwidth of 1.2 MHz. The device is available in a small SOT-363/US6/SC70-6 package and is ideal for applications such as portable medical devices, hearing aids, and wireless communications. (For reference only)