This part is a kind of semiconductor called HCF4066B.

Function of this product has QUAD BILATERAL SWITCH FOR TRANSMISSION OR MULTIPLEXING OF ANALOG OR DIGITAL SIGNALS.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

HCF4066B QUAD BILATERAL SWITCH FOR TRANSMISSION OR MULTIPLEXING OF ANALOG OR DIGITAL SIGNALS s 15V DIGITAL OR ± 7.5V PEAK TO PEAK SWITCHING s 125Ω TYPICAL ON RESISTANCE FOR 15V OPERATION s SWITCH ON RESISTANCE MATCHED TO WITHIN 5Ω TYP. OVER 15V SIGNAL INPUT RANGE s ON RESISTANCE FLAT OVER FULL PEAK TO PEAK SIGNAL RANGE s HIGH ON/OFF OUTPUT VOLTAGE RATIO: 65dB TYP. at fIS = 10KHz, RL = 10KΩ s HIGH DEGREE OF LINEARITY: < 0.5% DISTORTION TYP. at fIS = 1KHz, VIS = 5 Vpp, VDD - VSS > 10V, RL = 10KΩ s EXTREMELY LOW OFF SWITCH LEAKAGE RESULTING IN VERY LOW OFFSET CURRENT AND HIGH EFFECTIVE OFF RESISTANCE: 10pA TYP. at VDD - VSS = 10V, Tamb = 25°C s EXTREMELY HIGH CONTROL INPUT IMPEDANCE (control circuit isolated from signal circuit 1012Ω typ.) s LOW CROSSTALK BETWEEN SWITCHES: 50dB T [ ... ]

HCF4066B PDF Datasheet Download