OP Amplifier
WT27x is OP Amplifier. It is a general purpose IC with low power consumption. Especially suitable for electronics products requiring power saving.
http://www.weltrend.com.tw/en/product-GeneralPurpose-OPAmplifier.asp?s=12
I/O Expander
Because the function requirements of electronics products are becoming more and more complex, very often the number of the “system main chip” I/O is not enough to meet these requirements. Using I/O Expander can easily satisfy these system requirements.
http://www.weltrend.com.tw/en/product-GeneralPurpose-IOExpander.asp?s=13
Switch IC
This series includes USB Data Switch and LED electric torch switch control IC.
http://www.weltrend.com.tw/en/product-GeneralPurpose-SwitchIC.asp?s=14