This part is a kind of semiconductor called SM5502.

Function of this product has (SM5501 / SM5502) Pressure Sensor.

Manufacturers : Silicon Microstructures

Image and pinout :

Some of the text within the PDF file :

SILICON MICROSTRUCTURES INCORPORATED SM5501/SM5502 Standard Pressure, Constant Current Standard Pressure, Constant Voltage • OEM PRESSURE TRANSDUCER FULLY TEMPERATURE COMPENSATED AND CALIBRATED DESCRIPTION Pressure sensor models SM5501 and SM5502 are fully temperature-compensated and calibrated. Each sensor is housed in a rugged plastic enclosure. Each series covers a wide range of full-scale pressures. Differential, gage and absolute measurement configurations are available for a wide variety of applications. Factory calibration provides either a gain-set resistor (Model SM5501) or a fixed 50mV full-scale output (Model SM5502). By eliminating the need for customer gain adjustments, these parts are truly interchangeable and offer remarkable assembly-cost savings f [ ... ]

SM5502 PDF Datasheet Download