Ironwood Electronics has recently introduced a new high
performance WCSP socket for 0.5-mm pitch 25 pin WCSP. The SG-BGA-7188 socket is
designed for 2.75 x 2.75-mm package size and operates at bandwidths up to 10
GHz with less than 1 dB of insertion loss. The contact resistance is typically
20 milliohms per I/O. The socket connects all pins with 10 GHz bandwidth on all
connections. The socket is mounted using supplied hardware on the target PCB
with no soldering, and uses the smallest footprint in the industry. The socket
also incorporates a new quick insertion method using an integrated compression
plate to the socket lid so that ICs can be changed out quickly. The application
of the socket is to verify the function of IC in a development system
specifically power management unit in an embedded camera module. The socket
also features replaceable IC guide that allows testing of other package sizes
with 0.5-mm pitch, such as 2.25 x 2.25 mm, 2.25 x 2.75 mm, and 1.75 x 2.25 mm.
The SG-BGA-7188 sockets are constructed with high
performance and low inductance gold plated embedded wire on elastomer as
interconnect material between device and PCB. The temperature range is -35 to 100°C.
The pin self inductance is 0.15 nH and mutual inductance of 0.025 nH. Capacitance
to ground is 0.01 pF. Current capacity is 2 amps per pin.