Technical
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FPC Reinforcement Types
Criteria for Classification of electronic Component Classes
Four softwares suitable for beginners to draw PCB circuit boards
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What are the advantages of small and medium batch SMT processing?
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PCBA prototype procedure
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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
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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
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How to Place Special Components during PCB Layout
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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?
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Classification of PCBs from three aspects
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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

Temperature zone standard for SMT reflow soldering

Generally speaking, standard SMT reflow soldering is also the eight-temperature zone reflow soldering. Of course, there are SMT reflow soldering machines with any temperature zones in actual use. And this is based on the actual soldered products and the actual consideration of SMT processing manufacturer. Overall, the more SMT reflow soldering temperature zone, the better the soldering effect. If the soldering quality requirement is relatively high for the circuit board, many manufacturers use SMT reflow with ten temperature zones and twelve temperature zones. Usually, the common SMT reflow soldering on the market is the SMT reflow soldering with eight temperature zones.



The temperature zone of lead-free solder paste SMT reflow soldering is generally divided into preheating zone, constant temperature zone, soldering zone and cooling zone. So what are the differences between these temperature zones? What are their respective temperature standards?



1. Preheating zone: It takes about 100S for the preheating zone heat up to 175 degrees, so that the heating rate of the preheating zone can be obtained.

2. Constant temperature zone: The high temperature in the constant temperature zone is about 200 degrees, and the time to reach the temperature is 80S. The difference between high temperature and low temperature is 25 degrees.

3. Reflow zone: The high temperature of the reflow zone is 245 degrees, the low temperature is 200 degrees, and the time to reach the value is about 35S; the heating speed of the reflow zone is: 45 degrees/35S=1.3 degrees/S.

4. Cooling zone: In cooling zone, It takes about 100S for the temperature drops from 245 degrees to about 45 degrees, and the cooling speed is 2 degrees / S.

SMT reflow soldering eight-temperature zone temperature setting: 160°C in the first zone, 180°C in the second zone, 185°C in the third zone, 185°C in the fourth zone, 210°C in the fifth zone, 250°C in the sixth zone, 275°C in the seventh zone, and 250℃ in the eighth zone. The temperature settings of these temperature zones also need to be adjusted according to the reference temperature curve value given by the solder paste manufacturer and the actual production situation.

In fact, the temperature setting of the eight-temperature zone of SMT reflow soldering is not fixed, it can also be flexibly adjusted, but the adjustment needs to be determined according to the quality of the SMT solder paste, the actual soldered products and the SMT reflow soldering machines. Therefore, for the temperature zone standard of SMT reflow soldering, this article is only for reference of general setting.