0.5mm 4 Layer PCB Prototype Service Immersion Gold For Access Control

PCB parameters

Advantages

a) Via in pad to save PCB room.

b) Immersion gold PCB. Excellent surface planarity, particularly helpful for PCBs with BGA packages or even CSP mounted components to reduce failure rate during assembly and soldering.

c) PCB manufacturing on required specifications. Right manufacturing instruction (MI), comprehensive equipment management and maintenance and process control, strict WIP inspection and monitoring as well as working instruction, all those make the whole fabrication process totally controlled.

d) ISO certified PCB manufacturing factory.

e) Meeting your printed circuit board needs from PCB prototyping to mass volume production.

More Applications in Electronics

Led Lighting Products
Power Supply Variable
Control Security
Programmable Controller
Biometric Access Control System

PCB knowledge: Glass Transition Temperature (Tg)

The thermal properties of the resin system are characterized by the glass transition temperature (Tg), which always is expressed in °C. The most commonly used property is the thermal expansion. When measuring the expansion versus the temperature, we can get a curve as shown in following picture. The Tg is determined by the intersection of the tangents of the flat and steep parts of the expansion curve. Below the glass transition temperature, the epoxy resin is rigid and glassy. When the glass transition temperature is exceeded, it changes to a soft and rubbery state.

For the most commonly used types of epoxy resin (FR-4 grade), the glass transition temperature is in the range 115-130°C, so when the board is soldered, the glass transition temperature is easily exceeded. The board expands in the Z-axis direction and stresses the copper of the hole wall. The expansion of epoxy resin is about 15 to 20 times greater than that of copper when exceeding Tg. This implies a certain risk of wall cracking in plated-through holes, and the more resin around the hole wall, the greater risk. Below the glass transition temperature, the expansion ratio between epoxy and copper is only three times, so here the risk of cracking is negligible.

FAQ

Where do I send my gerber files?
Your files are emailed to the sales representative who will reviews the files and provides a quote based on your lead time and quantity requirements.
If your're contact us first time, you can send enquiries to our market department at
You can also contact us through the website contact form in the pages.