This part is a kind of semiconductor called BB304A.

Function of this product has Silicon Variable Capacitance Diode (For FM tuners Monolithic chip with common cathode for perfect tracking of both diodes).

Manufacturers : Siemens Group

Image and pinout :

Some of the text within the PDF file :

Silicon Variable Capacitance Diode Preliminary Data q q q q q BB 304A For FM tuners Monolithic chip with common cathode for perfect tracking of both diodes Uniform "square law" characteristics Ideal Hifi tuning device when used in Low-distortion back-to back configuration Color-coded capacitance subgroups available (see characteristics) Type Ordering Code (tape and reel) Q62702-B118 Pin Configuration 1 2 3 A1 C1/C2 A2 Marking Package BB 304A color coded capacitance groups TO-92 Maximum Ratings Parameter Reverse voltage Peak reverse voltage (R ≥ 10 Ω) Forward current TA ≤ 60 °C Storage temperature range Thermal Resistance Junction-ambient Symbol Values 18 20 50 – 55 … + 150 Unit V V mA °C VR VRM IF Tstg Rth JA ≤ K/W Semiconductor Group 1 10.94 BB 304A Elect [ ... ]

BB304A PDF Datasheet Download