This part is a kind of semiconductor called BF337.

Function of this product has Small Signal Transistors.

Manufacturers : Central

Image and pinout :

Some of the text within the PDF file :

Small Signal Transistors TO-39 Case (Continued) TYPE NO. DESCRIPTION VCBO (V) VCEO (V) *VCER VEBO (V) ICBO @ (µA) *ICEO **ICES ***ICEV ****ICER 10*** 10*** 10*** 0.25 0.30 10 10 10 10 0.10** 0.10** 0.10** 0.10** 0.02 0.02 0.02 0.02 0.02 0.10 0.10 0.10 0.10 0.02** 0.02** 550* 0.01 50 50 50 100**** 0.15 0.05 0.05 5.00 20 0.01 10** 0.50 0.50 75 60 45 50 50 80 80 100 100 60 60 40 60 60 60 60 60 60 40 40 40 40 45 45 200 185 100 200 250 200 20 250 30 150 20 100 60 100 100 VCB (V) hFE @ IC @ VCE VCE (SAT) @ IC fT Cob (mA) (V) (V) (mA) (MHz) (pF) *TYP *TYP ton (ns) *TYP toff (ns) *TYP NF (dB) *TYP MIN 2N5784 2N5785 2N5786 2N5859 2N5861 2N6190 2N6191 2N6192 2N6193 BC140 BC141 BC160 BC161 BC300 BC301 BC302 BC303 BC304 BC440 BC441 BC460 BC461 BCW78 BCW80 BD115 BF178 BF257 BF258 BF259 BF337 BFR36 BF [ ... ]

BF337 PDF Datasheet Download