This part is a kind of semiconductor called AD5539.

Function of this product has Ultrahigh Frequency Operational Amplifier.

Manufacturers : Analog Devices

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Some of the text within the PDF file :

a FEATURES Improved Replacement for Signetics SE/NE5539 AC PERFORMANCE Gain Bandwidth Product: 1.4 GHz typ Unity Gain Bandwidth: 220 MHz typ High Slew Rate: 600 V/␮ s typ Full Power Response: 82 MHz typ Open-Loop Gain: 47 dB min, 52 dB typ DC PERFORMANCE All Guaranteed DC Specifications Are 100% Tested For Each Device Over Its Full Temperature Range – For All Grades and Packages VOS: 5 mV max Over Full Temperature Range (AD5539S) IB: 20 ␮ A max (AD5539J) CMRR: 70 dB min, 85 dB typ PSRR: 100 ␮ V/V typ MIL-STD-883B Parts Available PRODUCT DESCRIPTION Ultrahigh Frequency Operational Amplifier AD5539 CONNECTION DIAGRAM Plastic DIP (N) Package or Cerdip (Q) Package PRODUCT HIGHLIGHTS 1. All guaranteed dc specifications are 100% tested. 2. The AD5539 drives 50 �� [ ... ]

AD5539 PDF Datasheet Download