Andres Rojas

Andres Rojas has submitted responses to the following questions.

Low Operating Temperature Lead-Free Solder
For soldering copper wires inside motors exposed to extreme temperature cycling from -200 °C to +100 °C, standard lead-free solders like SAC305 ...

Stencil Pattern for LGA Power Pad
Yes, using multiple smaller stencil apertures (often referred to as a "window pane" or "segmented" pattern) for the center ground ...

Application Using No-Clean and Water Soluble Fluxes
Yes, it is technically acceptable to use a water-soluble solder wire for hand soldering through-hole components on assemblies originally processed ...

Solder Ball Wrinkles
The direct answer would be, defect condition for class 2 and 3 if and only if, the total soldering system ...

Solder Alloy Investigation
Yes, there are several test, but the easy and simple way to know the alloy and the elements of the ...

Design Considerations and Impact on Assembly
These questions have a wide and long answers but i will try to provide some recommendations that helps to you ...

Conformal Coating Bubbles
Yes the IPC mention that is a Defect – Class 1,2,3 if have: Bridging of adjacent lands or exposed conductive ...

Solder Joint Blow Holes
Hi, the characteristics of HASL and ENIG finish are quite different and need modify the current process for HASL to ...

Matte Black Solder Mask Defects
Hi, I have several customers that have PCBs with ENIG finish, 2 -12 layers with matte solder mask of several ...

Oxidation of Solder Balls During Secondary Reflow
I can't understand the question well. Do you mean the solder balls of a BGA or Solder balls generated by ...

BGA Component Cleaning Spec
The dedicate standard to BGA processes is the IPC 7095. Its important understand the full process and take in considerations ...

Seeking IPC and J-STD Definitions
This terms are used on J-STD standards and refers to components hermetically sealed with plastic, glass, ceramic, metal etc. and ...

Challenge Wetting Solder to Brass Pins
Brass in normal conditions is very difficult to solder and wet because is a material very sensitive to oxidation. In ...