No that is not true - we plug ENIG ZIF flex - same part - in and out 100šs
of times a day - all kinds of designs- it is handling/handling/handling.
But if you are worried about handling then go to immersion tin or
electroplated gold over lo- stress nickel. Steve
--
On 2016-04-06, 10:24 AM, "TechNet on behalf of Stadem, Richard D."
<[log in to unmask] on behalf of [log in to unmask]> wrote:
>Based on the emails below, it sounds like the ZIF connector is
>incompatible with any flex application where it will be mated more than
>once.
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of David Hillman
>Sent: Wednesday, April 06, 2016 9:22 AM
>To: [log in to unmask]
>Subject: Re: [TN] ENIG on flexi PCBs
>
>Hi team - a data point for the conversation: the EN plating has 1%-3%
>elongation so its not very robust to bending stresses.
>
>Dave
>
>On Wed, Apr 6, 2016 at 10:19 AM, Vladimir <[log in to unmask]>
>wrote:
>
>> According to the best flex guru I know any bending with ENIG is
>>excessive.
>>
>> Regards,
>>
>> Vladimir
>>
>> SENTEC
>>
>> Sent from my BlackBerry 10 smartphone on the Rogers network.
>> Original Message
>> From: Stadem, Richard D.
>> Sent: Wednesday, April 6, 2016 10:13
>> To: TechNet E-Mail Forum; Vladimir
>> Subject: RE: [TN] ENIG on flexi PCBs
>>
>> What is the limit, and how do you define that?
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir
>> Sent: Wednesday, April 06, 2016 9:10 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] ENIG on flexi PCBs
>>
>> I don't think E-Ni thickness has anything to do with the issue. Most
>> probably the flex was bend over the limit. That's what we normally see
>> from our customers.
>>
>> Regards,
>>
>> Vladimir
>>
>> SENTEC
>>
>> Sent from my BlackBerry 10 smartphone on the Rogers network.
>> Original Message
>> From: Mumtaz Bora
>> Sent: Wednesday, April 6, 2016 10:05
>> To: [log in to unmask]
>> Reply To: TechNet E-Mail Forum
>> Subject: Re: [TN] ENIG on flexi PCBs
>>
>> Hello Nigel, Cracking issues in flex can also occur based on the type
>> of copper used for the traces. Is your supplier using rolled annealed
>> copper or ED( electro deposited ) copper. Rolled annealed copper is
>> preferred for flex circuits.
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Nigel Burtt
>> Sent: Wednesday, April 06, 2016 2:10 AM
>> To: [log in to unmask]
>> Subject: [TN] ENIG on flexi PCBs
>>
>> IPC-4552 requires 3-6um nickel, but does not appear to distinguish
>> between rigid FR4 PCBs and flexible PCBs.
>>
>> A flexible interconnect PCB using ENIG with ZIF end connectors has
>> been shown to be prone to track cracking near the ZIF ends. The
>> supplier has suggested a lower thickness of nickel 1-3um rather than
>> the IPC spec to would be beneficial to resolve this and tests on
>> samples seem to bear this out.
>>
>> Does anyone have any experience of such a suggested modification of
>> ENIG spec and that thinner nickel improves the resistance to
>> stress-cracking for flexi tracks?
>>
>> In this specific application as there are no component soldering
>> requirements so the thinner nickel under the gold does not lead to
>> solderability concerns, but what would be the likely consequence on
>> other flexi/flex-rigid designs with flexi ZIF connector ends and SMT
>> components if a 1-3um thickness was imposed more generally? Increased
>> likelihood of black-pad type defects?
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