Terminations, Requirements for smc connectors – Northern Connectors Harting DIN 41 612 Connectors User Manual

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Gen

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Terminations

Requirements for SMC connectors

SMC (Surface Mount Compatible) connectors have to withstand

temperatures of up to 240 °C in the reflow oven for 10 to 15 se-

conds. Therefore, the moulding must be made from a dimensio-

nally stable plastic which expands at the same rate as the pcb

material when subjected to heat.

The length of the connector contacts should be such that they

protrude by no more than 1.5 millimetres after insertion to the pcb.

Each contact collects solder on its tip as it penetrates the solder

paste in the hole. So if the contact was too long, this solder would

no longer be able to reflow back into the plated through hole by

capillary action during the soldering process, therefore the quality

of the soldered connection would suffer as a result.

Connector design must permit both automatic

assembly with

pick-and-place machines and manual positioning for test and pre-

production batches. It is also important for the packaging of the

connectors to be suitable for automated assembly. Experience

shows that deep-drawn film and reel packaging fed into the pick-

and-place machines with the aid of a conveyor system is particu-

larly suitable.

HARTING SMC technology

HARTING offers its customers a complete system concept for in-

tegrating SMC technology into existing production lines. We ma-

nufacture a wide range of SMC connectors (3 and 5 row) in com-

pliance with IEC 60603-2, D-Sub connectors in compliance with

IEC 60807 and connectors from the har-mik® series with contact

spacing of 1.27 millimetres. In addition, HARTING supports the

market with packaging and processing concepts, which have been

developed in collaboration with renowned manufacturers of SMC

soldering and assembly plants.

Advantages of the “Pin in Hole Intrusive

Reflow” process:

• Partial dip soldering or press fitting is no

longer required

• Complete compatibility with Surface Mount

Technology

• Complete integration into the automated

assembly process

• Reduced floor space in the production plant

• As a rule, no additional investment costs

Fig. 5: HARTING connector mounted in a tape ready

for placement using an odd form assembly station.