This part is a kind of semiconductor called OP27GP.

Function of this product has Low-Noise / Precision Operational Amplifier.

Manufacturers : Analog Devices

Image and pinout :

Some of the text within the PDF file :

a FEATURES Low Noise: 80 nV p-p (0.1 Hz to 10 Hz), 3 nV/√Hz Low Drift: 0.2 ␮ V/؇ C High Speed: 2.8 V/␮ s Slew Rate, 8 MHz Gain Bandwidth Low VOS: 10 ␮ V Excellent CMRR: 126 dB at V CM of ± 11 V High Open-Loop Gain: 1.8 Million Fits 725, OP07, 5534A Sockets Available in Die Form GENERAL DESCRIPTION Low-Noise, Precision Operational Amplifier OP27 PIN CONNECTIONS TO-99 (J-Suffix) BAL BAL 1 –IN 2 +IN 3 V+ OUT NC OP27 The OP27 precision operational amplifier combines the low offset and drift of the OP07 with both high speed and low noise. Offsets down to 25 µV and drift of 0.6 µV/° C maximum make the OP27 ideal for precision instrumentation applications. Exceptionally low noise, en = 3.5 nV/√Hz, at 10 Hz, a low 1/f noise corner frequency of 2.7 Hz, and high gain (1.8 million [ ... ]

OP27GP PDF Datasheet Download