This part is a kind of semiconductor called AP4048.

Function of this product has 1000 TO 4000 MHz TO-8 & TO-8B CASCADABLE AMPLIFIERS.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

12/00 AP4048 AR4048 Typical Values 1000 TO 4000 MHz TO-8 & TO-8B CASCADABLE AMPLIFIERS AP4048/AR4048 +24.0 dBm +35 dBm 38 dB High Output Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Third Order I.P. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Reverse Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Performance Thin Film Available in Surface Mount AP4048 TO-8 Package for Amplifiers 0.450 (11.43) DIA. 0.208 (5.28) MAX. 0.025 (0.64) SPECIFICATIONS* Parameter Frequency (Min.) Small Signal Gain (Min.) Gain Flatness (Max.) Noise Figure (Max.) SWR (Max.) Input/Output 0.185 ± 0.015 (4.70 ± 0.38) 0.018 ± 0.002 DIA. PIN (0.46 ± 0.05) (4) PLCS 0.504 (12.80) DIA. 50 OHM INPUT GROUND 50 OHM OUT [ ... ]

AP4048 PDF Datasheet Download