The J112 is an N-channel junction field-effect transistor (JFET) manufactured by ON Semiconductor. It is typically used in high impedance switching applications such as filters and amplifiers. It is also used as an audio preamplifier. The J112 features low noise, high input impedance and low source-drain capacitance. It is available in standard TO-92 through-hole package and also other packages depending on the manufactured quantity.