Not true. 

1.   A press pin is a solid square post pin like the Amistar's gold pins connected end to end on a bandoleer for auto insertion or an AMP pin that is mounted side by side in clips for auto-insertion. The corners of these solid pins cut into the barrel or barrel plating for the entire length and make a very reliable contact. 

- The typical use is for male headers or to eliminate two male connectors in midplane designs where a female connector can be connected to both sides of the PCA. The design is very reliable. 

the down side is that is the insertion equipment or a semi-auto machine is used and the operator isn't very careful then the pins can hit off center and destryo the barrels. 

2.    The compliant press pins are exactly that "compliant". The eye shaped pin, split pin or roll pin style pin has a point at which the pin compresses against one area (two points) of the barrel or in the case of the roll pin design makes contact for the entire length. 

These pins never cut into the barrel with enough force to damage it but the eye or split pin design has much less surface contact, typically two pint of contact. The roll pin design has much more contact area over the length of the barrel. 

 The advantage is easier insertion although the insertion tooling can be very expensive as you need a tool for each size connector as the insertion tool in most cases has to push on each pin and not the plastic connector body to keep the height of the pin within the body at the correct height and not crack the body from the high insertion force. Many pin designs reference 6 lbs per pin. Some of the multimods and right angle metal coax connectors allow a flat bar type press tool.  

The pin that is stamped with the Eye shape design should be considered carefully on OSP only barrels as to the stress and number of disconnects expected in the DFM. If the assembly is basically a one time connection and then enclosed it should be fine. Hovever for continuous duty like in multiple configuration or test systems, the reliability is not there. Eventually you'll be soldering the leads and you'll have to solder the leads after any connector or pin is damaged and the pin(s) have to be replaced for high reliability. For class two the vendors will state that two insertions is acceptable but how will a repair depot or field return repair site know that, unless there is a universal plan to put a mark on the board at the location to indicate that one replacement has been done already. 

I  have many years of experience on every press application and pin design. If you have any other questions please ask and I'll help you. 

John Goulet 

MFG/Process Engineer 



  
----- Original Message ----- 
From: "Brian Chandler" <[log in to unmask]> 
To: [log in to unmask] 
Sent: Wednesday, May 25, 2011 7:44:52 AM 
Subject: Re: [TN] Pres Fit Pin Technology guideline 

Most often, 'Press Fit' and 'Compliant Pin' are used to reference the same technology. Press Fit could include solid, non-compliant pins so I try be specific when using these terms. 

We have validated both PCB finishes for automotive underhood applications with Compliant Pin. 

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