3rd Floor, Nanhai Plaza, NO. 505 Xinhua Road Xinhua District, Shijiazhuang Hebei China
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Circuit Board Components

  • If you need assistance in finding your components, you can contact us for advice.
  • We provide a one-stop turnkey PCBA service, and we are here to help you purchase all your PCBA supplies.
  • All of our assembly components come from reputable Digikey and Mouser companies.

Circuit Board Components

  • Placer Speed:
    6000 Chips/Hours
  • Lead time:
    25+Days (To Be Decided)
  • SMT:
    SMT, Through Hole Assembly Single / Double-Side SMT, Single / Double-Sides Mixture Assembly.
  • PCB Size:
    50 mm×50 mm ~450 mm×406 mm
  • PCB Thickness:
  • Min. Diameter / Space of BGA:
    0.2mm / 0.35mm
  • Qualifications:
    ISO 9001:2008
  • Accuracy:
    <±40 µm, Under the Condition of 3σ,CPK≥1
  • Min.Line / Track Width:
  • Minimum Width / Space of QFP
    0.15mm / 0.3mm, Minimum Diameter / Space of BGA: 0.2mm/0.35mm
  • Reliability Test:
    Flying Probe Test / Fixture Test, Impedance Test, Solderability Test, Thermal Shock Test, Hole Resistance Test, and Micro Metallographic Section Analysis, etc.

Circuit Board Components

  • 1
    Send Files To Us(Gerber&BOM)
  • 2
    Quote In 24 Hours
  • 3
    Confirm The File and Order
  • 4
    PCB Fabrication Part procurement
  • 5
    Soldering, Testing Quality Control
  • 6
    Packaging& Delivery

Circuit Board Components

Prototype+Components Procurement+Soldering+Testing

More Discounts for Medium-Volume Prices

Accept T/T, cash, credit card, PayPal, bank transfer, etc.

Our two factories have price support for different orders

Circuit Board Components
Lead Time

average production time for Printed Circuit Board Assembly) is board presented after the entire parts and components get soldered and rightfully installed. A PCBA orders:

Production Days
PCB Fabrication+Parts Procurement
  • * Please triple-check all files and information before placing the order.
  • * Shipping time depends on the destination country and the shipping method selected.

How to order

In Order To Quote You, We Need:

Gerber File

.brd / .pcb / .pcbdoc / .gbr / .cam


The Microsoft Excel format (.xls / .xlsx / .csv / or tab-delimited)

why us

Quickturn PCB Assembly

  • PCB fabrication and parts procurement are carried out simultaneously, saving time
  • Prototype orders placed within 24 hours
  • Quote and Order Online at any time

Competitive Price

  • Our price is one of the most competitive in the world
  • Own factory with reasonable cost control, no hidden cost in it
  • Accept T/T, cash, credit card, PayPal, bank transfer, etc.
  • Our two factories have price support for different orders.

On-Time Delivery

  • Standard methods are DHL and FedEx, door-to-door service. Average Shipping Time only 2-4 Days.
  • Cooperate with two transportation companies for many years with discounted prices
  • Anti-static+Moisture-Proof+Anti-Vibration Packaging; Inspection certificate
  • Professional agent To Iran, Pakistan

Quality Assurance

  • All products follow the IPC or UL Standards and the ROHS&REACH standards.
  • 98% customer positive evaluation and satisfaction Standardized factory processes and management Multiple testing services

Return and Refund

  • In case our PCB is not usable due to our fault, you can ask for compensation.
  • We can refund your account directly or rework the unusable boards or re-fabricate your PCB and re-ship to you at our cost, but please cooperate to solve the problem if you need to rework.

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We have two PCB assembly factories, one in Shijiazhuang, one in Shenzhen.

The factory in Shijiazhuang is a dedicated division of our advanced service(military sector), equipped with 4 SIEMENS SMT lines, and the Shenzhen factory is dedicated to our standard service (Non-Military) equipped with 4 YAMAHA SMT lines, X-ray and AOI, providing a quality assembly service with very reasonable prices.

We can provide all kinds of Electromagnetic Interference (EMI) responsible for many cases of circuit board failure. EMI causes about 50% of PCB prototype assembly service you, including wiring harness assembly, injection, and conformal coating.


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NXP France

Top Questions

1. How do I prepare the BOM file?

After the order payment is successful and confirmed, our professional engineer will review all files again.

If there is no production problem, we will manufacture the PCB precisely as designed. If there is a production problem with the files, we will communicate it to you through e-mail.

2. Will WellPCB check the files after I place an order?

After the order payment is successful and confirmed, our professional engineer will review all files again.

If there is no production problem, we will manufacture the PCB exactly as designed. If there is a production problem with the files, we will communicate it to you through e-mail.

3. What does your quoted price include?

The PCB assembly pricing includes setup fee, stencil fee, assembly service fee, components cost, and shipping cost. We do not charge any other labor fees.

4. Do you offer assembly on boards fabricated by another company?

Yes, we do. You only need to package the PCB and components and send them to us, or we can also help you purchase components and assemble them for you.

5. Do you offer any discounts?

Medium and Large Batch Price Advantage reasonable Price for the Bulk purchasing of components

The two factories also give supports for different orders. We can apply for discounts according to the situation.

SMD components: How to Identify SMD Components in Circuit Board

SMD componets

Table of Contents

Understanding the PCB components is a real struggle for new electronic engineers. So in this article, We will make it simple to understand what SMD components are, the types and how to identify the PCB component. 

Let’s jump right in…

What are SMD Components?

Surface mount devices are electronic components placed directly onto the surface of a PCB. The technology used to mount SMD components in this manner is surface mount technology (SMT).

Before SMT emerged in the 1960s, there was a through-hole technology construction method. It involves using lead on the electronic components to insert them into a hole drilled in a PCB

SMD electronic devices are smaller in size than their through-hole counterparts. Meaning, a lot of them can fit on both sides of the board. So this allows for a much higher component density and more connections per component. 

Other advantages of SMT components over through-hole counterparts include:

  • First, easy manufacturing process 
  • Second, the solder of an adjacent SMT component is not easy to displace during the soldering process. 
  • Finally, autocorrect small errors in component placement.

However, through-hole electronic components also have their advantages, including better stability.  For that reason, you can combine the two technologies for better functionality.

Types of SMD Components

Based on various factors, SMD components can be either active or passive components. These two types of SMD components differ in terms of: 

  • Nature of energy source
  • Functionality
  • Power gain
  • Flow of current
  • Requirement of an external source

Active Components

These are active devices that: 

  • Deliver power or energy to the circuit. 
  • Produce energy form of voltage current.
  • Capable of providing power gain.
  • Can control the flow of current.
  • Require an external source for the operation.

Examples include transistors, diodes, integrated circuits, and SCR among others. 

Passive SMD Components

Passive components are devices that:  

  • First, utilizes power or energy from the circuit
  • Then, store energy in the form of power or circuit
  • Besides, incapable of providing power gain
  • Also, cannot control the flow of the current
  • Finally, do not require any external source to operate

Monolithic ceramic capacitors, thick film resistors, and tantalum capacitors are the main examples.

Circuit Board Components Identification

Well, we are going to show you how to identify SMD components in a circuit board. Given that SMD components are many, we will take you through the most commonly used ones. 

Chip Resistors (R)

SMD components1

Chip resistors are common SMD packages on PCB electronics. The first two or three digits on the body of a chip resistor indicate the resistance value. The last digit is a multiplier with a power of ten. “105” is equivalent to “1 M Ω” and “672” is “6.7K Ω “. 

Network Resistor (RA/RN)

Network resistor chips feature high-grade ceramics with metal electrodes on either end of the chip. The chips consist of a group of resistors that have similar properties. It’s the same as identifying chip resistors.

Ceramic Capacitors

An interlocked ceramic dielectric block has metal electrodes. A layer of plated tin covers the inner electrodes, linked to the end terminations (NiSn). In general, PCB manufacturers utilize SMDs with MLCC. Aside from the COG (NPO) type, there are three more varieties of MLCC: the X7R and Y5V types.

SMD components3

Diode (D)

Diode (D)
seven color diode on white background

The pin voltage regulation of an SMD diode is similar to the general-purpose SMD diodes in terms of terminals. By just observing the casing, you can identify the positive and negative poles of SMD diodes. But the marks wear out and in that case, we use a multimeter for identification. 


When a current travels through a Semiconductor Crystal, it generates light. The individual product manufacturing guideline determines the polarity of an SMD LED. SMD LEDs are available in different sizes. Like most SMD components, you can identify them in size and numbers.

SMD components5

Transistors (Q)

The most common surface mount device transistor packages are SOT-23 and SOT-223 (larger). The first two letters on the transistors identify them, regardless of the manufacturing code.   

SMD components6


SMD inductors have +ve reactance, and they come in a variety of sizes and shapes. You can see their values on the casings of the components. The value is in standard two-digit and exponent fashion. Example 100 µH would be 101 – 10 x 10^1, and 100 would be 10 x 10^0. 

SMD components7

SMD Transformers

In general, there is a wire wrap around the SMD transformer toroidal core. The design includes surface-mount headers for PCB connectors. The SMD transformer design is different from other types in many ways. They have unique voltage & current output, power rating, bandwidth, and more. 

SMD components8

Crystal Oscillators (X)

Identifying SMD crystal oscillators is simple. If it is within an electrical circuit, you need to locate the position of the crystal oscillators. For a computer motherboard, you will see the label “XTAL”, with the frequency written on top of the device. 


SMD fuse helps in surface onboard circuit protection. The voltage rating is sometimes indicated by a voltage code letter. For example, in “F02G1R00A”:

F- fuse

02- Style

G- voltage rating 

1R00-current rating 

A- time delay rating

SMD components9

IC (U)

An integrated circuit is the most functional component of electronic products. Surface-mount packages for ICs come in a variety of shapes and sizes. The waffle pack holds large ICs such as plastic leaded chip carriers (PLCC) and quad flat pack (QFP). 

Leadless ceramic carriers are the main surface-mount technology packages for IC. 


Hopefully, we have made SMD component identification easier during the PCB assembly process. Please feel free to contact us with any questions on SMD components. 

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