Part Number	Manufacturer / Brand	Brife Description
Y1940	Texas Instruments （TI）	Y1940 TI MSOP IC
Y19994	MICREL / MICROCHIP	Y19994 MICREL DIP16
Y19994A	MICREL / MICROCHIP	Y19994A MICREL DIP-16
Y19AF1117D	FAIRCHILD	Y19AF1117D FAIRCHILD IC SOT-252