Precautions for PCB CCL Selection, China printed circuit board manufacture-SysPCB_
What are the advantages and applications of flexible microcircuits?
FPC Reinforcement Types
Criteria for Classification of electronic Component Classes
Four softwares suitable for beginners to draw PCB circuit boards
What information is needed for SMT processing?
What are the advantages of small and medium batch SMT processing?
PCB related knowledge- The purpose of each layer of the PCB
How to do heat resistance testing for PCB board
Detailed explanation of rigid-flex board and IC carrier board
PCBA prototype procedure
Defects which can be detected by the SPI
What are the spacing requirements for designing PCB circuit boards?
What are the classification and advantages of PCB metal substrates?
Difference between the processing technology of 1Layer AL PCB and 2Layer AL PCB
Introduction of FPC Cable and its usage
advantages of Shenzhen SMT assembly factory
inspection items before PCB ordering
usages of ceramic substrates
main applications of PCB boards
Cost-effective PCB product services
How to check short circuit of a circuit board during manual soldering
Identify the polarity of electronic components during PCBA processing
Means Which Can Prevent Component Shifting in SMT Processing
Skills of PCB prototype manual soldering
Reasons for the shift of Components in the SMT Process
Seven Types of PCB Probes
What Should Be Paid Attention to in Layout of High-frequency PCB
Precautions for PCB CCL Selection
Advantages of LED Plant growth light
Advantages of using LED grow lights to grow industrial hemp
Detailed explanation of PCB manufacturing process and precautions
Detailed explanation of PCB manufacturing process and precautions
How to draw multilayer PCB on Altium Designer
Three basic elements of interference and how to suppression them.
Decrease interference between digital circuit and analog circuit
SMT Component Placement Process Of Parts : Manual Placement
SMT factory incoming PCB material inspection
Basic concepts commonly used in PCB design
Ideas and principles of High speed PCB layout
Component layout rules and safety distance considerations
SMT assembly process quality specification
5 points in PCB layout
Professional interpretation of SMT
Advantages and disadvantages of different PCB surface treatment
Special process in PCB prototype
Why the via hole become open after component assembly
Keep the cost of the PCB as low as possible
what are the causes of PCB board heating radiation problem
Pad size and via diameter dimensions consideration in PCB prototyping
How to Judge the Acceptance of PCB Quality
Which Color Circuit Board Sells the Most Expensive
Method to Solve the Noise Interference of Power Supply on High-frequency PCB Board
Disassembly Skills of Chip Components on PCB
What Factors Should Be Considered in the Selection of High-frequency PCB CCL
How to Place Special Components during PCB Layout
What Are the Functions of Capacitors in Circuits?
Testing Techniques for Common Electronics Components
What to do if There is a Short Circuit on the PCB
Desoldering Principles and knowhow during PCBA Processing
Black Oxidation of the Inner Layer of the Multilayer PCB
How to Ensure the High-performance Design of PCB
What Is the Printing Process of SMT Solder Paste?
PCB without fiducial mark, Is There Any Way to do SMT for It
What Are the Benefits of Reserving Break-up Tab for PCB Production
How Does SMT Affect PCB Production Time and Speed It Up
Classification of PCBs from three aspects
Common Problems and Solutions for Dry Film pasting during PCB Manufacturing process
Several Elements to Inspect after PCB Design
What is a halogen-free circuit board?
What Do Capacitive Coupling and Decoupling Mean?
What Are the Differences Between PCB Paste Mask and Solder Mask?
How PCBA Is Packaged and Shipped
How long can PCBA finished products be stored?
What Are the Differences and Relations Between PCB, PCBA, and SMT?
PCB Baking Specifications
PCB "Solder Mask Tenting" and "Solder Mask Opening"
Five reasons for PCB deformation and six solutions
Importance of first article inspection of PCBA board
Temperature zone standard for SMT reflow soldering
Small and medium volume PCB manufacturers in China
The main reason for PCBA cleaning
For power filter, the more capacitors, the better?
What does PCBA programming mean?
Content of PCB incoming testing
What conditions must be met for PCB circuit board soldering?
What is Blind via and Buried via
PCBA Manufacturers Temperature and Humidity Sensitive Components Management

Precautions for PCB CCL Selection

In PCB manufacturing, the choice of substrate material is particularly important, and the properties of different boards are also different, such as thermal expansion, heat resistance coefficient, flatness and other factors will affect the performance of the entire board. What factors should be paid attention to when choosing substrate materials?

First of all, you have to figure out where the materials you need are used, and what characteristics you want these plates to have, so that you can buy the materials you really need.

For general electronic products, generally select FR-4. It is not a material name, but a material grade. It represents a material specification that the resin material must be able to self-extinguish after being burned. At present, there are many types of FR-4 grade materials used in circuit boards, but most of them are composites made of so-called Tera-Function epoxy resin, plus filler and glass fiber. The composites have the characteristics of high temperature resistance, flame retardant, insulation and so on. In addition, the substrate will bend after being heated, and the expansion and contraction of the board will affect the components, which will cause the electrode to peel off and reduce the reliability. Therefore, you should try to choose a plate with a small degree of bending, and FR-4 is a good choice.

The following factors should be considered when selecting PCB substrate materials:

(1) Appropriately select substrates with a higher glass transition temperature (TG), and the TG should be higher than the circuit operating temperature.

(2) High heat resistance
It generally requires a heat resistance of 250°C/50S.

(3) Good flatness
In SMT, it is required to use PCB with a small degree of wrap and twist as much as possible, and the warping degree is required to be less than 0.0075mm/㎡.

(4) Low coefficient of thermal expansion (CTE)
Due to the inconsistency of the coefficient of thermal expansion in the X, Y direction and thickness, it is easy to cause PCB deformation. In severe cases, it will cause the plated through hole to break and cause damage to the components.

(5) Electrical performance
In high-frequency circuits, it requires selecting materials with high dielectric constant and low dielectric loss. The insulation resistance, voltage strength, and arc resistance must meet the product requirements.

After knowing about the above-mentioned elements of substrate selection, We believe that it will save a lot of effort when selecting PCB substrate materials.