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Construction and Reliability
IndustryPacks and their carriers were conceived and engineered for rugged industrial
environments. The PCI-60A is constructed out of 0.062-inch thick FR4 material. The six
copper layers consist of a power plane, ground plane, and four signal planes. The power
planes significantly reduce conducted and emitted RF noise. They also assist in heat
dissipation. Solder mask covers exposed traces on both sides.
Components are a mix of surface-mount and through-hole. Programmable ICs are
socketed in low profile gold-plated screw-machine pin sockets. High insertion and removal
forces are required, which assists in keeping components in place. If the application
requires unusually high reliability or is in an environment subject to high vibration, the user
may solder the four corner pins of each socketed component into the socket. The factory
can build socket-free boards, as well as extended temperature range boards, on special
order.
The IndustryPack connectors are keyed, shrouded and gold-plated on both contacts and
receptacles. They are rated at 1 Amp per pin, 200 insertion cycles minimum. These
connectors make consistent, correct insertion easy and reliable.
The IndustryPack is optionally secured to the carrier board with four metric M2 stainless
steel screws. The heads of the screws are countersunk into the IndustryPack. The four
screws provide significant protection against shock, vibration, and incomplete insertion.
For most applications, they are not required.
IndustryPacks provide a low temperature coefficient of 0.89 W/°C for uniform heat. This is
based on the temperature coefficient of the base FR4 material of .31 W/m-°C, and taking
into account the thickness and area of standard IndustryPacks. This coefficient means that
if 0.89 Watts is applied uniformly on the component side, the temperature difference
between the component and the solder side would be one degree Celsius.
Most of the components on the PCI-60A are CMOS. Many IndustryPacks are also
primarily CMOS. Nonetheless, adequate cooling of the host system is strongly
recommended.
The PCI-60A features independent three-terminal pi filters on all power lines to the
IndustryPacks. This aggressive filtering of high frequency noise allows precision analog
and high-speed digital IndustryPacks to be mixed in the same slot. The power line filters
both block digital noise from elsewhere in the host system from entering an IndustryPack,
and also block noise generated from an IndustryPack from entering the host system.
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