Xeltek Programming Adaptor: S702 - 64-pin QFN to PEP adaptor The Xeltek XEL-S702 is a Programming Adaptor which accepts any device in a 64-pin QFN package. The adaptor the can only be used with the Xeltek 3000U Programmer and PEP100 - Pin Expander Module. It also supports BCC, LPLL and MLP packages.