Interconnection


A contribution to more reliable and more economic wiring

14 August 2002 Interconnection

The increasing use of modular systems in the electronics industry, as a result of efforts to reduce costs, has led to efforts to find a reliable and economic method of wiring. For many years, solder connections were dominant in the electrical industry but the continued miniaturisation of electronic components and assemblies led to three wiring systems becoming of increasing importance: wire wrapping connections; clip connections; and motherboard wiring.

The least expensive connecting method is the ERNIPRESS technique which involves the use of 16 or 32-pole female-contact strips and complete male and female connectors to DIN 41612 that are pressed into through-plated PCB holes.

Advantages

Major advantages of ERNIPRESS: no wiring errors; a gas-tight connection that is proof against corrosion and vibration; no soldering operation on multilayer circuits; no cold joints.

IT is also economical since: it achieves high packing density; contacts placed only where required; connection of a number of leads simultaneously; low tools investment; assembly by workers with little training; less expensive to install.

Easy servicing is also a benefit: easily-followed connections; labelling the circuit board facilitates rapid identification of the required connection; interchangeable contacts; the protruding wrap posts facilitate additional x-y wiring with up to 3 wraps or serve as a transfer field for the ERNI mateable transfer wiring systems KSG173, KSG193 and KSG253.

Printed circuit boards

With generous tolerance PCB holes, modern production-processes make it possible to obtain consistant results in the manufacture of PCBs for press-fit connections without any particular effort. Where two or more double-sided PCBs are placed together, a plastic film can be laid between as insulation ('sandwich-assembly'). The holes in the film are drilled together with the circuit boards.

In such cases press-fit connectors with noncompliant press-fit zones should be used. The base material for the circuit boards should be epoxy glass-laminate of types Hgw 2372.1 to DIN 7735, FR 4 or G10. On some connector types it is possible to replace individual contacts.



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