Leading the Printed Circuit Board Industry

HTDCircuits.com is one of the world’s largest and dedicated multi layer PCB suppliers. Our passion for electronics and other semiconductors has helped us to become one of the best PCB manufacturers in the business. Apart from this, it has prompted us to expand beyond the boundaries of our country and reach the whole world. 
Printed circuit boards from HTD Group Circuits are the answer to the latest technological advances in the domain of electronic circuit designing technology. These comprise a series of different components assembled together like a waterfall that can be used to perform multiple functions all at the same time by producing a complete circuit. We make it a point to mention all the components that have been assembled, so that it is easy for you to make proper use for it, irrespective of whether you are an expert professional or an amateur.

As we all know, China has a fabulous market for electronics, steel engineering suppliers and manufacturers but their manufacturing skills are well known as well. HTD Circuits as PCB board manufacturers owns a large PCB factory which produces all kind of PCBs you can think of! The custom PCBs can be printed according to your own specifications, ranging from a couple of layers to those going up to as high as 16 layers.

HTD Group Circuits is committed to provide you the best quality of service. This is why all the PCB fabrication is done under the strictest quality control and from the best quality materials, under expert supervision. We even provide you superior quality aluminum PCB boards, copper boards, laser cut stencils, flexible PCBs and a number of other varieties of custom PCB that fit your requirement and budget. 
So order today!

Top 100 PCB Manufacturers From China Report

Top 100 PCB manufacturers: Click Pic to View Online

The Reason Why HTD Shared Top 100 PCB manufacturers?

-Many  oversea PCB electronic company don’t know the China PCB industry.
-Some of China PCB manufacturers produce bad quality
-Better service from Top PCB manufacturers

Top 100 PCB manufacturers Report

Recent, there was a ranking about Top 100 China PCB manufacturers on wechat.
Jim want shared this report to all PCB purchase managers.

HTD Group Circuit Board Solution

Now HTD capabilities is ranking the 51th on the top PCB manufacturers report.
So HTD have more oversea customer.
If you want to place PCB, please mail to info@htdcircuits.com

The time of PCB manufacturer customers' reference

If you have experience in new products development, you may know the risk of a PCB manufacturing sourcing is really hard work.
This post we will discuss this topic.

To measure a good PCB manufacturer

You know, to measure a good PCB manufacturer have many factors.
But the customer references are the first factor.
Because you can from those cooperated customer to analysis.
What is the most hot sell PCB type and the PCB market share.

The time of PCB manufacturer customers' reference

This issue may most PCB purchase want to know.
Under HTD circuits experience, this is often done by a supplier before extending credit.
The same process can serve the end customers well.

Source: http://www.htdcircuits.com/how-can-the-risk-of-a-pcb-manufacturing-sourcing-decision-be-minimized-.html

The mechanical via that PCB manufacturer can be done

Why HTDcircuits discuss the smallest mechanical via?

This paper is focus on the smallest mechanical via.
In fact we have announce our PCB manufacturing capability.
And we have mention the smallest drill size.
There were many customers ask questions about the smallest mechanical via HTD can be done.
So we have to discuss this topic.

The mechanical via that PCB manufacturer can be done

If they are true vias where the finished size is NOT of any consequence, we say, “Why not call them out as +.003” minus the entire hole size?”
At that point I tell them that we can drill smaller and require less signal pad and anti-pad size, which opens the customer up for some routing for these fine-pitch parts. While we are at it, let’s talk about pitch. 
Many times, we are approached by customers talking about a specific pitch between mounts or pads, such as .4mm or .5mm pitch. 
Understand that without a design to see the via image data, it is difficult for a fabricator to properly understand what pitch means to the customer.
The pitch is the distance from the center of a given entity to the center of an adjacent entity.

The smallest mechanical via related to SMT

This can mean different things based on pad/mount size. Let me give you an SMT pad as an example:
A .5mm pitch means .0197” between the centers of two BGA pads or surface mounts. This seems like a very reasonable distance, given today’s circuit board geometries. 
However, what if the designed surface mount pad width is .015” wide? This would mean a .5mm pitch would leave only .0047” edge to edge between the mounts. 
This gives you little or no room to route a trace between mounts at that width and pitch.
Clearly as the pitch between parts decreases based on today’s shrinking chip footprints, the associated surface mount or BGA pad widths need to decrease as well to be able to route even a .003” or .004” trace between them.

HTD Group explain Gold Finger PCB technology

HTD Group is professional gold finger PCB manufacturer from China.
This paper will discuss gold plate technology.
If you want to learn more, please mail to info@htdcircuits.com

Gold contact surfaces are often used on circuit boards with membrane switches which are a technology of choice for industrial, commercial and consumer products. When PCBs will be repeatedly installed and removed electroplated gold is used for edge-connector contacts or as they are more commonly known: Gold fingers.
It is difficult to hear the term Gold finger without remembering the villain Auric Goldfinger from the James Bond film of 1964.
However, the gold fingers (gold-plated contact pins) found on PCBs are quite unlike Auric’s stubby, fat digits.
To begin with, the plating thickness of a PCB gold finger is typically a mere 300 micro-inch. At this thickness the hard gold is expected to survive 1,000 cycles before wear through.

HTD PCB manufacturer expert: Consider the component factor during impedance design

HTD PCB manufacturer expert: Consider the component factor during impedance design

Match component impedance:
This information should be found in the component data sheet.

Once you have this information you now know the required impedance value of the track you need to connect these two components.

Track characteristics: track length, width and thickness, its proximity to other tracks, ground planes, laminate thickness and dielectric constant (Er) are all important factors to consider.

For tracks located on outer layers the thickness of the solder mask must also be taken into consideration.

Use a Microstrip: This is a trace on one layer separated from a plane on another layer by a material (such as the substrate).

Remember the antenna example?

A substrate acts like the cable insulator and the plane acts like a shield.

Microstrip configurations are popular because you can use impedance calculators or field solver software to give you recommended trace dimensions based on the impedance you require and the parameters\configuration you are using.

Different configurations and combinations of these Microstrips can be used:

Surface:
Trace on one side and a copper plane on the other.

Coupled:
Where you have more than one trace on one side and a copper   plane on the other.

Embedded:
Where the trace(s) are sandwiched between the substrate with a copper plane on one side.

Stripline:
Where the trace(s) are sandwiched between the substrate with a copper plane on both sides.

Using these methods, where you calculate all the parameters in order to control the impedance is often referred to as “Controlled Dielectric”.

This is sufficient for a lot of designs, as long as you specify the parameters to your manufacturer and they stick to the specifications.


You can calculate your impedance for free here.

From a HTD PCB manufacturer to discuss impedance control

From a HTD PCB manufacturer to discuss impedance control.
If you want to learn more impedance control solution for big brand customers, please contact to us.


Let’s take the cable connecting your TV to your antenna\satellite dish and look at it through the lens of impedance.


The purpose of this cable is to transfer the signal from one device (in this case your satellite dish) to another (in this case your TV).

To obtain the best possible signal, the impedance of the satellite dish must match that of the cable and the impedance of the cable must match that of the TV.

If the impedances don’t match, then only a portion of the signal gets transferred down the line to the TV.

The rest of the signal gets sent back along the line to the antenna where it gets resent and another portion of it may now get to the TV but obviously later than the original signal.

This impedance mismatch causes interference in the signal resulting in a blurred picture on our TV or even some double imaging if the mismatch is particularly bad.

Now transfer this scenario to PCBs and imagine the consequences if the correct signals were not

reaching their destination at the required time due to a mismatch in impedance.

Basically nothing would work as well as it should. Controlling impedance then sounds like a pretty good idea, but how do you go about it?

HTD PCB manufacturer experts: Why is it Important to Understand Impedance?

HTD PCB manufacturer experts: Why is it Important to Understand Impedance?

It is all about efficiency. Theory shows that maximum signal transfer happens when all impedances along the signal path are matched.

In all circuits which operate under high frequencies and process high speed digital signals, it is important to control impedance.
Impedance control is fast becoming a standard requirement for PCB manufacture and is has become critical in areas such as:

Telecommunications
RF applications
High speed digital applications
Impedance controlled circuits can be found in the electronics you use every day:  your mobile phone, TV, computer, printer and even your car!

How to consider a used machine for a small PCB manufacturer?

Used SMT assembly equipment can be found all over the Internet.
In most cases it's “buyer beware,” but there are some cases where you can get a good deal and save some money over a new machine.
This chapter will help guide you in your search and give you some tips to avoid getting a raw deal or actually spending more than new by the time you get that bargain acquisition in good working order.

The “re” words—rebuilt, reconditioned, recycled, recertified, remanufactured, or refurbished—are intended to describe the various conditions you can expect to find in the used market; however, you really need to look deeper.
Many times the wording is used interchangeably to mean the same thing.
The kind of description you want to avoid is simply “used” or “as-is,” because you have no idea how much work (and dollars) it will take to get it in good working order and registered by the manufacturer.


The best situation, if you can find it, is to buy a factory reconditioned machine from a respectable manufacturer.
Here’s the distinction I make between “factory reconditioned” and “refurbished”:
A refurbished machine is one that may have been damaged and repaired, while a factory reconditioned unit has had all its worn parts replaced, outdated components updated with new, everything tested to be in good working order, and a factory warranty applied by the manufacturer.

There are quite a few resellers who say they recondition used machines, but it’s always a risk.
Here’s why: Most SMT assembly equipment is initially licensed and registered with the OEM PCB manufacturer, similar to a title on a car. So, to get instructions, support and access to spare parts, you’ll need to register your used machine with the OEM, and that can cost between $2,000 and $5,000, depending on the manufacturer.
Not doing so would be taking a big financial and implementation risk, and if you bought from someone other than the manufacturer you could be paying for support they might not be able to deliver. Source: PCB007

Many high-end industries seek high TG PCB

The Printed circuit boards (PCB) market is thriving. Being indispensable products for the electronics industry, PCBs are catalysts of growth in the industrial manufacturing sector.

With more electronics products entering the market, the demand for PCB is always high. The companies involved in PCB are in a race to satisfy varied requirements.

Generally, the PCB manufacturer will be playing a volume game for economies of scale. There are thousands of companies involved in high scale production of PCBs. But all of them cannot be called as manufacturing prime quality products.

There is high competition in domestic, as well as global markets. Positively, it presents an opportunity for manufacturers to establish themselves with better quality standards to grab more customers.

As a product, PCB is exposed to high thermal loads and can endure long-term operating temperature. So the use of most appropriate material that can withstand high temperature is number one factor in deciding a supplier or manufacturer.

There may be other specifications -- 3/3 space/trace, gold plating, thin dielectrics, impedance control, micro via, etc. So, all these mean higher-technology designs and more attention to quality.

Many high-end industries seek high TG PCB. Basically, TG (Glass transition) is the value in determining the temperature at which a resin matrix converts itself from a glassy, brittle condition to a soft elastic one.

There will be an upper TG value at which the resin decomposes and delamination takes place. When TG is over 170°C, it is called high TG material. In choosing a PCB firm it is critical that an informed choice and decision is made. They must be capable of performing conventional assembly of mixed technology for double sided configuration and electronic components have to be on standard rigid, hybrid ceramic or flexible circuit substrates.

Other particulars include conductive materials suiting requirements in both automated and manual equipment to assemble low volume PCB.

What is important is ensuring that the processes are in place. If a board has BGAs, the supplier must make sure they have BGA assembly and rework capability and include X-ray to verify the assembly is good.

For large volumes, check whether they have sophisticated pick and place equipment. Also, the resources are n place to make paste stencils and blank PCBs while testing the boards for the desired parameters and output.

For prototyping pre-check all errors in layout and remove mistakes in the BOM as parts not matching the footprints on the board will turn out to be a risk.