If you would like to purchase an interposer, the type depends on how your chip is set up. The interposer connects to the device usually via flat-flex cables (FFC) that are either 40- or 50-way. The interposer you need depends on which connector your device presents – 40-way FFC, 50-way FFC, or 26-way IDC/0.1″. Contact us at [email protected] if you are unsure.