Abstract: The present invention discloses an adaptor suitable for use in optoelectronic circuit board. The adaptor according the present invention serves to adapt a package pin-out arrangement to a desired pin-out arrangement on a printed circuit board. The adaptor comprises a pin-in arrangement that electrically couples with the package pin-out arrangement. The adaptor further comprises an adaptor pin-out arrangement that is geometrically identical to the desired pin-out, and a flex-circuit that provides a plurality of electrical paths to connect the pin-in arrangement with the adaptor pin-out arrangement. In various embodiments, the adaptor further comprises a clamshell for holding the adaptor pin-out and the flex-circuit together in a single flat format.