I bought: Netgear WNCE2001-100PES
It costs about €36.90, which is a little less than the original Philips USB-WLAN-Adapter. So you might save € 2 or similar and it can be used with every device having a ethernet port ...
I have no problems with it and it works really fine on 42PFL7695K/02.
But this is offtopic ... Maybe it is better to open a new thread, if more discussion is necessary