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March 2017

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From:
Robert Kondner <[log in to unmask]>
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Date:
Mon, 20 Mar 2017 13:39:09 -0400
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Hi,

 Is the use of parylene NOT recommended as an insulating layer? It sure has a high dielectric strength. 

Does anyone have comments? I knid of like the parylene ide as it gets into all the itty bitty places.

Bob

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Theodore J. Tontis
Sent: Monday, March 20, 2017 12:38 PM
To: [log in to unmask]
Subject: Re: [TN] WG: [TN] Screen On Insulation

Coating is not to be used as an insulator. There is no guarantee that consistent coating thickness can be controlled meaning the ability to insulate/electrically isolate cannot be controlled.

If the concern is the planar core shorting to the board, ask the supplier to place kapton tape under the core. 

All of our planar transformer drawings call out kapton on the bottom of the core for this very reason.

Ted T

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Monday, March 20, 2017 11:06 AM
To: [log in to unmask]
Subject: Re: WG: [TN] Screen On Insulation

Torsten,

 Do you know how thick a parylene coating is? My recollection is pretty thin.

 So I checked, very high dielectric strength, thickness typically under 1 mil but it can be built up further with longer processing time.

Any idea wat coating with parylene cost for a small batch of boards?

Thanks,
Bob Kondner


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Torsten Hagge
Sent: Monday, March 20, 2017 9:17 AM
To: [log in to unmask]
Subject: [TN] WG: [TN] Screen On Insulation

Hi,

cheap solution could be a 1mil kapton tape with the mention risk of air gaps, fine and cost expensive solution parylene HT  coating before placing the ferrite cores... 

Take care 
Torsten



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-----Ursprüngliche Nachricht-----
Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Robert Kondner
Gesendet: Freitag, 17. März 2017 21:11
An: [log in to unmask]
Betreff: [TN] Screen On Insulation

Hi,

 

We have a PCB that turns out to require 2500VAC test for 60 seconds and we had some flash over on pads to vias. We also have a planar ferrite transformer with primary windings on one side.

 

Does anyone know of a screen on insulation material that can be used to increase flash over voltages? I would like to get a 2 or 3 mils of material.
My other option is to have a laser cut layer of isolation but that could leave air paths under the material.

 

Any other ideas welcome. 

 

Thanks,

Bob K.

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