Some Sockets (or pogo blocks) require a PC Board to be integrated to get the job done. These solutions are less than a complete fixture because they do not provide access to the test system via the PCB but instead route signals to new positions in the socket so that spring pins and other mating PC boards can access them.
- Interposers for pitch translation: These boards are used to change the pitch of the DUT to something different. This may be for compatibility to an existing PC board design or to make a device compatible with another socket: For example a complex and expensive PC Board has been built but at the last minute a design change necessitates a change of device package.
- In this case a small PCB is combines with a pogo block. The pogo block is mounted on the system PC board, the Interposer is mounted on the pogo block and the DUT is soldered to the interposer
- Coupon boards: In some instances a device is too small for analysis or needs to be removed from a package. The device is mounted on the top of a coupon board and the bottom has a footprint compatible with a socket such as an RTI LGA socket.
- Interposers for matching footprint: Sometimes we want to make an RTI socket compatible with a 3rd party socket footprint. In the case where the other socket uses a different contact technology that results in the PCB pads being offset from the DUT pad locations, an interposer will be necessary to move the pins over.
- In this case the RTI socket is mounted atop a pitch shifting interposer and RTI pogo block
- 2 Sided Module Sockets: If the device has contacts on both sides such is the case with some small PCB modules or cable ends then the socket will need contacts in both the base and lid. The challenge however is that most solutions require all signals to be integrated onto one plane for connection to the system PCB. To achieve this, a PCB is integrated into the lid of the socket and a second set of spring pins or a small cable assembly can transfer the signal from the top to the bottom layers.
- 2- sided cable end sockets: RTI makes sockets to test the ends of cables, the side of the socket is open and the cable is inserted. We have made sockets for Flex Cables, Flex Rigid and wired cables. Many of these cables have a flat construction and connectors on top and bottom. Depending on the cable, we may use a clothespin style clamp socket or a more traditional square socket base with push down clip lid with integrated PCB and pogo block
- POP Packages: Package on package devices have contacts on the top side intended to receive another IC package stacked on top. Often times, the device can be tested one side at a time and RTI sockets can be optimized to test in this configuration. However other times the device needs testing on both sides at once. In this case a 2 sided socket configuration is applicable,