Technical
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
Why choose Shenzhen SMT processing factory?
How long does it take to calculate the quotation for PCBA manufacturing?
Introduction of PCB design clearance requirements
Explanation of BOM, DIP, SMT, SMD
Introduction of the process of PCBA prototype
How to prevent pseudo soldering or cold soldering defects in PCBA manufacturing?

Characteristics difference between immersion gold PCB and gold plating PCB

I: Immersion gold PCB board and electric gold PCB board:
1. Immersion gold board and chemical gold board are the same process product, electric gold board and flash gold board are also the same process product. In fact, it is just a different name from different people in the PCB industry. Immersion gold board and electric gold board are more common in the title of the mainland China PCB manufacturers, while the chemical gold board and the flash gold board are more commonly referred to by the Taiwan PCB manufacturers.

2. Immersion gold/chemical gold PCB is generally called chemical nickel gold PCB or chemical nickel immersion gold PCB. The growth of nickel/gold layer is generated by chemical deposition; electro gold PCB /flash gold PCB is generally called electroplated nickel gold PCB or flash gold PCB. The generation of the nickel/gold layer is plated by DC electroplating.

3. Refer to the table below for the difference in mechanism between electroless nickel gold plating (immersion gold) and electroplated nickel gold (gold plating):

Color Appearance Solderability Signal Transmission Quality Engineering
Gold plating PCB Gold with little white Normal, accidently pseudo solder conductor skin effect, not good for high frequency signal 1. Gold surface is easy oxidize
2. Gold wire may cause short
3. Bonding stress with soldermask is not good
No need Line Compensation, suit for small space
Gold immersion PCB Gold good conductor skin effect is small 1. Gold surface is not easy oxidize
2. No gold wire
3. Bonding stress with soldermask is good
Need Line compensation


II: Why do not use "HASL" for high end PCB?
1. As the integration level of IC becomes higher and higher, IC pins become denser. The vertical spray tin process is difficult to flatten the thin pads, which brings difficulty to the SMT process; in addition, the shelf life of the HASL PCB is very short. The immersion gold board just solves these problems

2. For the surface mount process, especially for 0603/0402 or ultra-small surface mount chips, because the flatness of the pad is directly related to the quality of the solder paste printing process, it has a decisive influence on the quality of the subsequent reflow soldering, so the gold immersion is common in high-density and ultra-small surface mount processes.

3. In the PCB prototype production stage, due to factors such as component procurement, it is often that the board is not soldered immediately, but it is often used for several weeks or even months. The shelf life of the gold-plated board is longer than that of lead-tin board, so everyone is willing to use it. Besides, the cost of the gold-plated PCB in the sample stage is almost the same as that of the HASL PCB board. But as the wiring becomes denser, the line width and spacing have reached 3-4mil, gold plating process also brings about the problem of short circuit of gold wire.

As the frequency of the signal gets higher and higher, the skin effect of signal transmission in the multi-plated layer has more obvious influence on the signal quality:
The skin effect refers to: high frequency alternating current, the current will tend to concentrate on the surface of the wire to flow. According to calculations, skin effect depth is related to frequency.