Technical
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?
Factors that affect the Price of FPCB
What information is required for SMT processing at PCBA factory?
Skills of using 0ohm resistor in PCB design
How to select a PCBA manufacturer
SMT processing solder joint quality inspection
Characteristics difference between immersion gold PCB and gold plating PCB
Common malfunctions of Circuit Board Caused by Moisture
A Few Rules about PCB Panelization
Compare of multi-layer PCB with single/double layer PCB
Why do we need to introduce so many subdivided GND
Difference between immersion gold boards and gold plating boards
Aluminum PCB structure
Classification of different GND in circuit
Why PCB baking is necessary during manufacturing process
The handle and precautions of OSP board in SMT process
How to choose capacitors for filter decoupling
How to choose filter capacitor for switching power supply
5 database need for SMT process
Function of three-terminal capacitor
Introduction of PCB OSP surface treatment
Method of inspecting the quality of SMT by step
How to find the short point between VCC and GND
Difference between 850nm and 940nm infrared LED
Component layout of PCB SMT DFM
Pad shape influence on the strength and reliability of the soldering joints
The difference between high temperature solder paste and low temperature solder paste
Introduction to manual welding processing
Manual visual inspection in PCBA processing
Characteristics of the conformal coating process
Difference between hardware engineers and software engineers
PCBA processing operation rules
China PCB upstream materials has continued to soar
Difference between serial buses and parallel buses
The key points of quality control in PCBA processing
Common causes of solder beading during SMT process
Analysis of the advantages and disadvantages of HASL PCB surface
Requirements for layout of components during SMT assembly
Selection of electronic components and CCL for PCBA
Performance and appearance quality inspection of components.
Quality and Reliability of SMT Chip Processing and Production
Coupling and decoupling function of capacitor
Two methods to connect digital ground and analog ground
Common sense in SMT process

PCB Baking Specifications

I. The specification of PCB control

1. PCB unpacking and storage
(1) PCB board sealed and unopened can be directly used SMT assembly within 2 months of manufacturing date.
(2) The PCB board manufacturing date is within 2 months, and the unpacking date must be marked after unpacking.
(3) PCB board manufacturing date is within 2 months, after unpacking, it must be SMT assembly and used within 5 days.

2. PCB baking
(1) If the PCB is sealed and unpacked for more than 5 days within 2 months of the manufacturing date, please bake it at 120 ±5°C for 1 hour.
(2) If the PCB is more than 2 months from the manufacturing date, please bake it at 120 ±5°C for 1 hour before SMT assembly.
(3) If the PCB goes beyond 2 to 6 months of the manufacturing date, please bake it at 120 ±5°C for 2 hours before SMT assembly.
(4) If the PCB goes beyond 6 months to 1 year than the manufacturing date, please bake it at 120 ±5°C for 4 hours before SMT assembly.
(5) The baked PCB must be used up within 5 days (put into the IR REFLOW), and the unused PCB must be baked for another hour before being used SMT assembly.
(6) If the PCB is more than one year from the manufacturing date, please bake it at 120 ±5°C for 4 hours before SMT assembly, and then send it to the PCB factory for re-spraying tin before SMT assembly.

3. PCB baking method
(1) Large-scale PCBs (≥16 PORT) are placed horizontally, and the maximum number of a stack is 30 pieces. Open the oven within 10 minutes after the baking is completed, take out the PCB, and let it cool naturally (require using anti-bending fixture).
(2) Small and medium-sized PCBs (including 8PORTs below 8PORT) should be placed horizontally, and the maximum number of a stack is 40 pieces. The number of vertical type is unlimited. Open the oven within 10 minutes after the baking is completed, take out the PCB, and let it cool naturally (require using anti-bending fixture).


II. The preservation and baking of PCBs in different regions

The specific storage time and baking temperature of the PCB are not only related to the production capability and production craft of the PCB manufacturer, but also have a great relationship with the region.

The PCB made by OSP process and immersion gold process generally has a shelf life of 6 months after packaging, and it is generally not recommended to bake for OSP process PCB.

The preservation and baking time of PCB has a lot to do with the region. In the south China, humidity is generally heavier, especially in Guangdong and Guangxi. In March and April of each year, there will be "super humid" weather, and it is cloudy and drizzly for days on end and very humid at this time. PCB must be used up within 24 hours when exposed to air, otherwise it is easy to oxidize. After normal opening, it is best to use it up in 8 hours. For some PCBs that need to be baked, the baking time should be longer. In the northern regions of China, the weather is generally dry, the PCB storage time will be longer, and the baking time can also be shorter. The baking temperature is generally 120 ± 5℃, and the baking time is determined according to the specific situation.


PCB baking oven