18 pin dip
The MC3359 is a High Gain low–power narrow band FM detector integrated circuit for FM dual conversion of communication equipment. The MC3359 includes oscillator, limiting amplifier, AFC circuit, quadrature detect, operational amplifier, squelch circuit, scan-control and muting switch.
This part is the equivalent replacement for the following:
3130-6056-500, 600-565, EA33X8765, ECG860, MC3359, MC3359GP, MC3359P, NTE860, SK7731, SK7731/860, ULN3859A