James Mahoney

James Mahoney has submitted responses to the following questions.

Solvent Attacking Flex Circuits
I would be very careful using these types of cleaners when you have exposed acrylic adhesives. ...

Product Classification - Class I, II or III
IPC-2221 1.6 Classifications of Products ...

Solder Fillet Peaks
Why are you soldering the screw in the first place? Wouldn't a SEMS type screw embed itself into the solder ...

Recommendation for PCB Surface Finish
Most of my designs are specifying Lead Free Solder (HAL-LF) and/or ENIG. HAL is good for low tech components and ...

Can adhesive residues from tapes contaminate a cleaning solution?
Depends on the temperature of the solution. Typical tape adhesives will break down relatively quickly and could cause major problems ...

Is PCB Baking Necessary?
We see no reason to bake good 6012 class 2 or better laminated boards although material selection is key. ...

Conformal coating and connector holes
When we conformal coated our boards we used the spray method which prevented most material from getting into the holes ...

High Tg PCB requirement
Are you trying to process lead free metal? Do you have small packages on the board. Lifting pads could be ...

Conformal Coating & Humidity
Are you using compliant pinning? If so spray directly onto the pads and let the pin cut into the plated ...

Pre-Bake Standard for Rework
In my experiences and experiments it never hurts to pre bake epoxy with ED copper being heated at high temperatures. ...

Hand Soldering vs. Selective Wave for small LCD
I would suggest using a stencil to apply paste and yes wave the LCD with a controlled reflow oven that ...

Procedure for Baking Flexible Circuits
What's the end users process? Soldering the flex (lead free or not), Surface finishing, plasma processing, drying a high layer ...

Solder Components to Thin Flexible Circuits
How thin is the flexible section? Can you support the area with FR4 material? This way you can create a ...