I'm searching for the datasheet of a component which I think is a voltage
regulator and is from a 2 batery powered cd player which has several such
components and which reference code as printed on is "GY139" and which photo is
here : http://picpaste.com/GY139-bhTrEixQ.jpg

Another similar component on the same board is marked "KY139". I have not been
able to find anything with these part numbers.