This part is a kind of semiconductor called U440.

Function of this product has MONOLITHIC DUAL N-CHANNEL JFET.

Manufacturers : Linear Integrated Systems

Image and pinout :

Some of the text within the PDF file :

U/SST440,441 Linear Integrated Systems FEATURES Direct Replacement for SILICONIX U/SST440 & U/SST441 HIGH CMRR LOW GATE LEAKAGE ABSOLUTE MAXIMUM RATINGS @ 25 °C (unless otherwise stated) Maximum Temperatures Storage Temperature Operating Junction Temperature Maximum Power Dissipation Continuous Power Dissipation (Total) Maximum Currents Gate Current Maximum Voltages Gate to Drain Gate to Source Gate to Gate -25V -25V ±50V 50mA 500mW -65 to +150 °C -55 to +135 °C G1 D1 S1 2 1 7 3 5 6 1 MONOLITHIC DUAL N-CHANNEL JFET CMRR ≥ 85dB IGSS ≤ 1pA U SERIES TO-71 BOTTOM VIEW S1 1 2 3 4 SST SERIES SOIC 8 7 6 5 NC G2 D2 S2 S2 D2 G2 D1 G1 NC MATCHING CHARACTERISTICS @ 25 °C (unless otherwise stated) SYMBOL CHARACTERISTIC MIN U/SST440 TYP MAX UNITS 10 CONDITIONS VGS1 − VGS2 ∆ VGS1 �� [ ... ]

U440 PDF Datasheet Download