This part is a kind of semiconductor called AT-283PIN.

Function of this product has Digital Attenuator/ 15.5 dB/ 5-Bit/ TTL Driver/ DC - 2 GHz.

Manufacturers : Tyco Electronics

Image and pinout :

Some of the text within the PDF file :

Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz V 5.00 AT-283 Features n n n n n n CR-12 Attenuation: 0.5 dB Steps to 15.5 dB2 Temperature Stability: ± 0.18 dB from –55°C to +85°C Typical Low DC Power Consumption Hermetic Surface Mount Package Integral TTL Driver 50 O Nominal Impedance Description M/A-COM’s AT-283 is a GaAs FET 5-bit digital attenuator with a 0.5 dB minimum step size and 15.5 dB total attenuation. This attenuator and integral TTL driver is in a hermetically sealed ceramic 16-lead surface mount package. The AT-283 is ideally suited for use where accuracy, fast switching, very low power consumption and low intermodulation products are required. Typical applications include dynamic range setting in precision receiver circuits and other gain/leveling co [ ... ]

AT-283PIN PDF Datasheet Download