A Reputable Memory PCB Manufacturer from China

Long-Lasting Memory PCBs by PCBMAY

Computer memory plays a vital role in any digital working environment. This is the main reason why you should invest in prime Memory PCB products, such as those made by PCBMay.

• Follow your specifications for flash drive memory, DDR memory, and memory cards
• Support speed and performance of various devices with great RAM storage ability
• Outfit laptops, desktops, and other mobile devices according to your preference
• Traceable manufacturing process, using upgraded module technology

Our Memory PCBs won’t fail you. They are durable as well as cost-effective. Unlike other weak alternatives out there, our PCBs have withstood the test of time. With PCBMay, you get the best of both worlds—we fit your budget as well as your distinguished expectations.

In case there is a problem with your Memory PCB order, that is easily solved. Our professional crew will provide you with a complete 8D report to find out the root cause of the dilemma. Trust us to help you solve any PCB-related difficulty. Relax! We are the experts; we know PCBs best.

For larger orders, if you need a weekly Work-in-Progress report, we will provide it. We want you to feel confident about our manufacturing capability. If in case you need someone to talk to about your Memory PCB concerns, our sales staff is available 24/7. Meanwhile, our engineers answer your technical questions with the minimum hassle (1-2 hours).

So, what are you waiting for? PCBMay has all that you need from a PCB company. Inquire about your Memory PCB from us now!

Memory PCB: The Ultimate FAQ Guide

As a PCB manufacturer, we always get different questions about different PCBs. Memory PCB is one of them. So, we gather some most relevant questions about memory PCB and go to answer them.

However, memory is one of the most important parts of computerized devices. So, it’s important to know about the PCB inside them before doing business with them.

PCBs inside memories are sensitive and crucial. So, let’s check on what memory PCB is, what are their functions, and so on throughout the entire post.

What Is Memory PCB?

Memories are the devices that are utilized for data processing, acquisition, storage, retraining, and retrieval of information in computerized systems. They are also known as data storage devices. Essentially, memory is responsible for three fundamental operations. They are involved in the encoding, storing, and retrieval processes.

Memory PCBs Need Excellent Engineering

Computerized devices, on the other hand, make use of memory for the purpose of storing temporary information. Memory is often used to refer to “principal memory” or “primary memory,” depending on the context.

PCB, on the other hand, is the circuit board that is found in electrical gadgets. Memory, like other electrical devices, is powered by printed circuit boards (PCBs). The printed circuit board (PCB) permits diverse pieces to power up the functionality of electronic gadgets.

As a result, the memory PCB is the PCB that provides power to memories in order for them to work.

Here, in the following video, you will get an explanation of computer memory.

What Are The Features Of A Memory?

Memory is basically a device that directly shows its PCB. All other components are physically installed on it. However, to know more about the features of memory, the following exploration might be helpful.

The following are the features, or parts, whatever you say, of a memory.

Memory PCB

The board you see that all components are laid on is the memory PCB. Basically, the board is green and made of multilayers. Each layer is designed with conductive traces and different complex circuits.

The high-level memories generally use multilayer PCBs that ensure flawless signal passing. That does not bother with signal interference.

Dynamic Random Access Memory (DRAM)

The term “dynamic memory” refers to the fact that it stores data only for the time being. On the other hand, it updates the information on a regular basis. It is the most prevalent characteristic of memories.

In layman’s terms, DRAM is the memory’s central processing unit. It is often coated in either black or chrome.

A Memory Features Several Features

Contact Fingers

The connectors we see that connect the memory with the memory socket in the main board of computerized devices are the contact fingers. The information of the memory passes to the computer through the connectors.

Internal Traces

Internal traces are in the internal section of the memory. It is a particular layer that passes signals to the other components. The proficient design of the traces layer ensures efficient data passing.

Chip Packaging

Chip packaging is the fact that reflects the coat of the silicon of the memory. “Thin Small-Outline Package (TSOP” is the most common type of chip packaging.

Dual In-Line Package (DIP)

It is a through-hole component that is directly installed onto the surface of the memory PCB and soldered. Though, it may use any type of soldering as well.

Aside from this, there are different types of chip packaging used in memories. They are SOJ, TSOP, CSP, etc.

Stacking Of Chips

Chip stacking needs for high-performing memory modules. It needs to be stacking on into another for more powerful processing.

What Are The Application Sectors Of Memory PCB?

Memory is all about processing information and retrieving it. So, in this sense, every electronic device must have a memory to process functions. So, memories are used in the following sectors.

Computer RAMs Are Used As Temporary Memory

• Computer, laptop.
• Supercomputers, servers.
• Tablets, smartphones.
• Pendrive, flash memory PCB.
• Calculator, WiFi router, and other smart devices.

However, the memories for different devices are different. And the selection parameters are also different for the different devices. In this case, the memory PCBs are also different for the different types of memories.

The following are some selection parameters that the manufacturer considers before choosing memory modules for the devices.

• Processor controller interface.
• Memory type and its functionalities.
• Clock speed.
• Speed of interfacing.
• Cycle period.
• I/O voltage requirement.
• Package types.
• Memory size.
• DDR version, etc.

What Are The Basic Functions Of RAM In Computerized Devices?

The main function of the RAM or Random Access Memory is short-time data processing. That includes data read, write, and store.

However, in a brief discussion, the following functions show the RAM’s functionality in the computer.

Data Reading

The RAM accesses data and reads them very fast. When you need to get some from your computer, the hard disk may get slow because it stores large data.

To avoid such delays, the computer stores the data to the RAM for faster load. After faster reading, your computer does not delay reading the particular data. Because the reading time is faster in RAM than the hard disk.

Temporary Storage

As we mentioned before, RAM reads the data. After reading data the first time, the RAm also stores the data temporarily till you switch off the computer. If you exit the file and re-open it again, the RAM will do the opening fast.

Computer RAM Works As Temporary Storage

Application Loading

The main objective of reading and storing any file is to load it on the RAM. The RAM’s main objective is to load the applications for further use.

What Are The Different Types Of DDR RAMs?

For further advanced data processing, the idea of DDR RAM comes. DDR refers to Double Data Rate. You will get data works on both edges in DDR SDRAM. However, memory PCBs are used in different types of DDR RAM.

DDR Generations Are Different From Each Other Regarding Power And Performance

The generation changed one after another with further development. They are as follows.

First Gen DDR SDRAM

The first-gen DDR RAM was the first advancement to the SDR RAM. It was a 2-bit RAM with a 133~200 MHz clock speed rate. It was able to transfer files at 266~400 MT/s (Million Transfer Per Second)

Second Gen- DDR2 SDRAM

The second-gen- DDR2 was two times more powerful than DDR. It had 4-bit bandwidth. But the clock speed was almost the same as the DDR which is 133~200 MHz. However, the transfer rate was improved to 533~800 MT/s.

Third Gen- DDR3

The DDR3 got a significant improvement from its predecessors. It came with an 8-bit bandwidth. It also improved in data transferring which is 800~1600 MT/s.

Also, the DDR3 can be operated in 1.5v whereas the DDR2 used 1.8v. It ensures 40% less power consumption for the DDR3.

Fourth Gen- DDR4

Currently, most RAMs are operated in DDR4 technology. It doubles everything more than its predecessor DDR4. DDR4 transfer rates are available from 2133~3200 MT/s.

DDR4 also has some extra features like BDI, CRC, etc. DDR can be operated in 1.2v as well.

Fifth Gen- DDR5

Though DDR5 is not vastly available in the market, it can produce double the power than DDR4. DDR5 empowers 3200~6400 MT/s. It was first released in 2018 and is expected to be in the market vastly this year.

What Are The Most Difficult Issues In DDR Memory PCB Routing?

Timing is the most important consideration in the design of memory PCBs. Design elements for high-speed PCBs must be timed precisely in order to be effective. Memory PCBs, like high-speed PCBs, need precise timing to function properly.

You Need To ensure Accurate Time To Design Memory PCBs

The timeline has been compressed significantly. Otherwise, the design will fail to achieve the desired design objective and will instead result in an error or data corruption. However, while routing DDR memory PCBs, you will encounter the following additional difficulties.

• There is a problem with the supply voltage’s purity.
• Matching traces of varying lengths is another difficulty.
• Increase the time margin as much as possible to ensure that data transmission is faultless.
• Topology of the routing network and termination scheme
• Crosstalk reduction, among other things.

When It Comes To DDR Memory PCB Design Requirements, What Are The General Principles To Follow?

As we realize that designing memory PCBs are sensitive, you have to be more conscious and careful while designing them. However, there are facts to consider to design memory PCBs for accurate manufacture. They are as follows.

Maintain The Shortest Distance Between Microcontroller And Trace Wiring

• You must adjust the conductive trace length of the PCB. For this, you need a proper setup and hold time. The clock signal can be changed due to improper timing.
• For your DDR4 memory design, you must ensure a super clean and stable voltage. For this, you need to ensure a stable controlled impedance, implement vias carefully. On the other hand, make sure you place the capacitors on the microprocessor in the right place.
• Make sure you can properly lessen the trace length so that signal can not be disturbed.
• Before routing, make sure that all signals are grouped together. Make certain that the group is using 8-bit data.
• Maintain the shortest feasible distance between the CPU and the data wires.
• Make sure you ensure the same length traces in the same group.

What Are The Advantages Of Single Data Rate SDRAM Memory PCB?

Sometimes, using a DDR module may be overkilled when you use them for small systems. However, the embedded system must need memory modules. So, in this case, you can use single data rate SDRAM memory modules.

SDRAM Memories Fit Most In Low-Configured System

There are several advantages available for using SDRAM instead of a full DDR memory PCB for your desired embedded system.

• The microcontroller’s processor unit has the ability to access storage devices via the use of an onboard interface controller. The STM line of microcontrollers would be used to read SDRAM in this situation.
• In a large embedded system, you need to use a lot of memory PCBs. In this case, using single data rate SDRAMs will cost you less.
• SDRAM creates less crosstalk interference.
• SDRAM is slower, and the signal needs comparatively a little bit more time. This allows easy length matching and ensures easy routing.

What Are The Memory PCB Materials?

Now, come to the manufacturing facts of memory PCBs. Actually, till now we have been discussing the memory. Now, we will be discussing the technical facts of manufacturing memory PCB.

However, there are many materials used in making PCBs. But, all are not that popular and efficient. The following are the most popular PCB base materials for making PCBs.

FR4

FR4 refers to flame retardant. It is a NEMA-grade glass-reinforced epoxy laminate material. The woven fiberglass cloths are used with epoxy resin to make it flame retardant. It is the most popular material for making PCB boards.

FR4 Material

It has a good thermal, mechanical, and electrical state to cope. However, it is strong enough compared to its strength-to-weight ratio. This makes it the most popular choice for PCB boards.

On the other hand, FR4 is mostly used for lower layer counts board, which is up to 14 layer stackup. By the way, the combination with additives can make it suitable for the higher-layer count too.

It is the most cost-effective material, in one word cheap with quality.

Polyimide

Polyimide is superior to FR4. It is highly durable, stronger than FR4. It has developed performance for thermal, electrical, and mechanical sides than FR4. It is also costlier than FR4 too. You can use Polyimide material for higher-layer count PCBs.

Teflon

Teflon is the highest grade material for PCB board making. It is the most durable, strong, and high-performing material. However, as expected it also costs more than Polyimide and FR4.

On the other hand, Teflon of PTFE material needs mastery to handle in the PCB board making. It needs highly skilled staff and special equipment to use.

Aside from these, aluminum is also used as a base material for PCB boards.

How To Make A Memory PCB?

There are many steps to go through for making a memory PCB. Nut, everything starts with a schematic drawing. So, let’s see which steps are related along with the schematic diagram.

Schematic Diagram

Schematic is the 2d drawing or sketch of the PCB. It is the blueprint actually of what your PCB will look like. It shows every detail of the PCB to develop. For example, the size of the PCB, shape of the PCB, layer count, routing, component placement, etc.

Layout Design

The next step is to design the memory PCB layout. Import the schematic of your PCB schematic by the schematic capture of the designing software. Make a blank layout and convert it to a memory PCB layout by following the schematic.

Memory PCB Layout Design

Printing

Now, you need to print the PCB layout on the physical PCB board. For this, you need to make the board ready as per the schematic diagram before. Now print the memory PCB layout on the board. You may use 3d printing, laser printing, or chemical printing for your memory PCB.

See here, how laser printer prints a PCB on the PCB board.

Etching Traces

Now after printing the PCB, you need to etch the conductive traces. Though laser printing or 3d printing by default do the thing themselves.

Component Placing

After completing the etching traces, place the components of the memory PCB and solder them. However, you also can use SMT, or press-fit PCB components assembling as well.

Routing

Now, route the components through the conductive traces for the components.

After component assembling, then test your memory PCBs with different testing methods to ensure that the PCBs meet the required designed facts.

What Are The Thermal Properties Of Memory PCB Material?

Considering thermal properties for the memory PCB material is important because it is relatable to durability and performance. Let’s check the thermal properties requirements for the FR4 material for memory PCB.

Glass Transition Temperature (TG)

With a certain temperature range, the material gets softened, and back to the previous state after the heat is revoked. This is the Tg for the memory PCB material. For FR4, the Tg range is 200 to 250° C.

Decomposition Temperature (Td)

When Tg exceeds, the material gets changed permanently for a certain temperature range. The permanent evaluation of the material happens for the effect of Td. So, A memory PCB material should withstand up to 250° C for Td.

Coefficient Of Thermal Expansion (CTE)

When a PCB material exceeds its Tg, it starts to expand. The expansion rate with temperature is known as CTE. The CTE should not cross 70 ppm. Though the standard rate for CTE is 10 to 20 ppm.

Why Should You Monitor The Heat Of Your Memory PCB?

With high temperatures, your memory PCB may face several consequences. To avoid damage to your memory PCBs, you must monitor the temperature of the PCB when they are in use.

High Heat Causes Damage To Memory PCB

You may face the following consequences for high heat.

• Your memory PCBs’ structural integrity may be lost. For this, the physical structure may get damaged. Also, the PCB layers may fluctuate as well.
• The circuit lines could be disrupted. They will lose their functionalities as well. Signal pass will be obstructed, eventually could be permanently deducted.
• The different materials of your PCB are different in the expansion rate. Every material has its own CTE. so, when high heat happens, each material will expand at a  different rate. For this, the layers will not be together. The materials will be distracted from each other.
• Corrosion and oxidation are another big deal for PCB when high heat happens. High heat causes oxidation on the metals, and it leads your PCB to corrosion.

How To Skip The High Heat On Your Memory PCB?

For avoiding high heat on your memory PCBs, you need to take some effective steps, however. They can be as follows.

Memory PCB Heatsink Dissipates High Heat

• Use heatsink for heat dissipation.
• Use high-grade materials.
• Apply proper lamination.
• Maintain proper spacing among the components.
• Ensure the RTI and MOT by maximizing them.

How To Design Traces On Your Memory PCB To Avoid EMI?

To avoid EMI or Electromagnetic Interference of your memory PCBs, you must follow some trace design rules. They are as follows.

Keep Conductive And Return Paths Short In Memory PCBs

• Avoid using 45° to 90° angles for vias, traces, and other components in order to improve the quality and accuracy of the traces.
• Keep Separate the analog and digital signals
• Keep the trace length and return paths short.
• Maintain proper spacing among the components and traces.
• Use vias as per your need. Avoid the use of excess and unwanted vias.

What Is The Surface Finish Of Memory PCB?

Basically, in memory PCB, copper, and several metals are used. You must protect them from corrosions to ensure the proper functionality and durability of the PCBs.

Surface finishes are coated with different elements that ensure the protection of your PCBs. There are different types of surface finishes used for PCBs. They are as follows.

Immersion Gold- ENIG And ENEPIG

ENIG, also known as Electroless Nickel Immersion Gold. It is a surface finish with a mixture of nickel and gold. The nickel protects the copper, and the gold protects the nickel of the surface finish.

ENIG Surface Finish

On the other hand, ENEPIG is another version of gold finishing. It is incorporated with palladium which is less costly.

Immersion Silver– ImAg

The immersion slider features silver plating over the copper of the PCBs. It is highly reliable, RoHS compliant, and lead-free.

OSP

Organic Solderability Preservative is an organic surface finish that provides no toxic chemicals. OSP uses a water-based organic compound that makes bonds with the copper of the PCBs.

Immersion Tin– ImSn

Immersion tin is almost identical to the ImAg. However, in this case, the surface finish is made of tin rather than silver, and the coating is applied by hand.

Hot Air Solder Leveling– HASL

HASL is the cheapest surface finish. Its basic one is non-lead free, and non-RoHS compliant. However, it has another version that complies with RoHS and is lead-free as well. Though HASL is the most common type of surface finish, its use is decreased because of its harmful properties to the environment.

How To Properly Store Your Memory PCB?

Taking care of electronics, especially PCBs, are important when you want to store them. It is certain that you need to store them for shipping purposes, or any other facts. However, you should follow the following steps for storing your memory PCBs.

Moisture Barrier Bags Keep Moisture Away

• Build your storing area from the living environment. Make sure to have a dust-free environment first.
• You must ensure a moisture-free environment that will not bring humidity to the storing environment anymore.
• Use moisture barrier bags for packing the PCBs.
• Ensure dry packaging with the moisture barrier bags.
• Keep a certain temperature for the storing room.
• Handle and move the PCBs with utmost care.

How To Choose The Best PCB Manufacturer?

Picking the best PCB manufacturer is the most crucial point for your PCB production. On the other hand, since memory PCB is a sensitive technical object, there is no alternative for an experienced and well-equipped manufacturer.

So, to find the best PCB manufacturer, you can follow the following criteria.

• IPC certification along with other certificates for electronics manufacturers.
• Make sure the manufacturer has skilled, professional, and experienced staff.
• Also, check the experience of the manufacturing company in the industry.
• See that the manufacturer employed the latest technology for PCB manufacturing available.
• A very good workplace with the necessary equipment is a must. Check if it is ok.

If you find the mentioned criteria for the PCB manufacturer you are dealing with, you may go with them.

Final Words

We think manufacturing memory PCBs is one of the most challenging jobs. So, you should ensure the experienced and skilled enough PCB manufacturer for your PCB production.

PCBMay is one of the leading PCB manufacturers in China, providing you with the best quality PCB. We can help you in the best way possible for your memory PCB production, or PCB prototype. You may contact us for further query, or get the best quote.