This part is a kind of semiconductor called AP4048.

Function of this product has Cascadable Amplifiers.

Manufacturers : Cougar Components

Image and pinout :

Some of the text within the PDF file :

U AP4048 4 t e AR4048 e Typical Values .c om 1000 TO 4000 MHz TO-8 & TO-8B CASCADABLE AMPLIFIERS AP4048/AR4048 +24.0 dBm +35 dBm 38 dB 12/00 High Output Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Third Order I.P. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Reverse Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Performance Thin Film Available in Surface Mount w w at .D w h S a AP4048 TO-8 Package for Amplifiers 0.450 (11.43) DIA. 0.208 (5.28) MAX. 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) Typical 700-4100 MHz 16.8 dB ±0.3 dB <4.0 dB <1.6:1 Guaranteed 0 to 50° C -55 to +85° C [ ... ]

AP4048 PDF Datasheet Download