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Printed Circuit Board (PCB) for Surface Mount Technology (SMT)

Dec 08, 2018

Printed Circuit Board (PCB) for Surface Mount Technology (SMT)

A printed circuit board, or PCB, is an integral part of electronics. A PCB is basically a substrate (normally made from glass epoxy) with conductive traces etched from copper sheets. These copper traces facilitate flow of electricity. Electronic components are soldered along this conductive pathway thus controlling the flow and quantity of electricity needed.

A Printed Circuit Board is also known as Printed Wiring Board (PWB). When all the electronic components are soldered on a PCB, it is called a Printed Circuit Assembly or PCA and sometimes PCBA (Printed Circuit Board Assembly).

Printed Circuit Board (PCB) for Surface Mounting (SMT)

Printed Circuit Board (PCB) for Surface Mount Technology (SMT) need to be chosen wisely taking into consideration factors such as CTE (Coefficient of Thermal Expansion), cost, dielectric properties and Tg.

When designing surface mounting board (PCB), the selection of substrate is basically determined by the type of SMD components to be used. In any Electronics manufacturing or PCB assembly, when leadless ceramic chip carriers (LCCC) are mounted on printed circuit boards made out of glass epoxy substrates, solder joints cracking is generally seen about 100 cycles. The cause of the excessive stress is the CTE differential between the ceramic package and the glass epoxy substrate.

There are three different approaches to solder joint cracking problems:

  1. Using a substrate with a compatible CTE;
  2. Using a compliant top layer substrate; and
  3. Replacing leadless ceramic packages with leaded ones.

The most widely used substrate for SMT Printed Circuit Boards, is glass epoxy. It entails no CTE compatibility problems when used for plastic surface mount packages. However, This provides the solution for commercial applications only.

The most commonly used substrate for PCBs for military applications is one with a CTE value compatible with that of the ceramic packages that has been specified. Each PCB substrate option has its own advantages and disadvantages. Designers need to be carefully balances the constraints of cost with reliability and performance needs. In addition, solder masks and via hole sizes should be selected carefully.

Flason Electronic Co.,ltd provide a full smt assembly line solutions, including Lead free reflow oven, wave soldering machine, SMT pick and place machine, smt stencil printer, PCB conveyor manufacturer, PCB unloader, chip mounter, SMT AOI machine, SMT SPI machine, SMT X-Ray machine, SMT assembly line equipment, PCB production Equipment smt spare parts etc any kind SMT machines you may need, please contact us for more information: wechat whatsapp:008613691605420, Skype: flasonsmt, Email:


1) This is the first time I use this kind of machine, is it easy to operate?

There is English manual or guide video that show you how to use machine.

If you still have any question, please contact us by e-mail / skype/ phone /trademanager online service.

2) If machine have any problem after I receive it, how can I do ?

Free parts send to you in machine warranty period.

If the part is less than 0.5KG, we pay the postage.

If it exceeds 0.5KG, you need to pay the postage.

3) MOQ ?

1 set machine, mixed order is also welcomed.

4) How can I buy this machine from you? ( Very easy and flexible !)

A. Consult us about this product on line or by e-mail.

B. Negotiate and confirm the final price , shipping , payment methods and other terms.

C. Send you the proforma invoice and confirm your order.

D. Make the payment according to the method put on proforma invoice.

E. We prepare for your order in terms of the proforma invoice after confirming your full payment.

And 100% quality check before shipping.

F.Send your order by air or by sea.

5)Why choose us ?

A. Gold supplier on Alibaba !

B. Trade assurance to US$54,000 !

C. Best price & Best shipping & Best service !

Contact information

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Contact: Andrey

Phone: 13691605420

Tel: 0755-85225569


Add: Flason Industry park Shajing Town Baoan district shenzhen China 518104

When SMT matter to your business, partner with Flason. Where innovation takes form.
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