PCB Technical FAQ's
What are the inputs required to avail your PCB Layout service?
Schematic Diagram & Bill of Material
Do you support minor changes after an order is placed?
Please reach our Technical Sales Support Team to check the possibility with respect to the current order status.
Do you support the concept of PCB designing?
We have high-end PCB designing engineers who refer to the designing guidelines of a circuit as per the components datasheet & power requirements.
Can you convert our existing finished through hole-design to surface mount?
Please reach us on E-mail email@example.com to check the feasibility of such projects.
How will your design team get in touch with us for any queries/doubts related to an ongoing order?
We can have a call or use TeamViewer.
What is a schematic?
A schematic, or schematic diagram, is a representation of the elements of a system using abstract, graphic symbols instead of realistic pictures.
What Is BOM (Bill Of Material)
The Bill of Materials, commonly known as a 'BOM', is a list of all the needed parts for the manufacturing process. This list generally includes designator, descriptions, manufacturing part numbers, footprint, and required quantities.
How do I decide how many layers I need to use in my design?
It depends upon the Density & the size of the PCB.
What is Impedance?
In electrical engineering, electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied.
What are the minimum and maximum PCB sizes you can fabricate?
Minimum X10mm*Y10mm & Maximum X430mm*Y585mm
What do you mean by material?
The main elements of the PCB are dielectric substrate (rigid or flexible) with copper conductors on it, vias and holes both plated and non plated. As the dielectric substrate, the glass-epoxy laminates or composite materials are used. ... FR4 is a glass fiber epoxy laminate. It is the most commonly used PCB material.
What do you mean by Layers?
Printed circuit boards (PCBs) consist of anything from one layer to multiple layers of dielectric and conductive materials. When bonded into boards, these layers carry circuits that power a vast range of home electronics, such as alarm clocks, kitchen appliances, desk supplies, computers and mobile devices.
What do you mean by TG?
A temperature gradient is a physical quantity that describes in which direction and at what rate the temperature changes the most rapidly around a particular location. The temperature gradient is a dimensional quantity expressed in units of degrees (on a particular temperature scale) per unit length.
What do you mean by the Dispatch Unit?
The form of the final manufactured PCB. It could be either Single Board or Panel.
What do you mean by PCB Dimension X & PCB Dimension Y?
The horizontal values in a pair of coordinates are called “X” while the vertical values are called “Y”.
What do you mean by PCB Name?
The name which will be available on your all commercial documents like Quotation, PI, Tax Invoice, etc.
What do you mean by Board Thickness?
Printed Circuit Board (PCB) thickness refers to the finished PCB board’s thickness.
What do you mean by Start Cu Thickness?
Typically, these sheets begin with preset copper thicknesses. The copper thickness is available on the raw material, which is getting used for the manufacturing of bare boards.
What do you mean by Surface Finish?
A PCB surface finish is a coating between a component and a bare board PCB. It is applied for two basic reasons: to ensure solderability, and to protect exposed copper circuitry.
What do you mean by Peel-Off?
Peel-off masks are used to protect selected solder holes, pads and gold-plated contacts or carbon elements during mass soldering.
What do you mean by Countersunk?
A conical hole, which is cut to allow the flat head screw to be used, is called a countersink hole. It can also be called conical hole which is cut into a PCB laminate, or a hole created by using a drill. The main purpose is to let the head of a countersunk screw, once it is inserted and screwed down in the hole, to sit flush with the surface of the laminate. The cone-shaped hole, which is cut into the PCB laminate, is a countersink. It is generally used to permit the tapered head of a screw to sit flush with the top or bottom of the laminate.
What do you mean by Impedance Control?
Controlled impedance is the characteristic impedance of a transmission line formed by PCB conductors. It is needed when high-frequency signals propagate on the PCB transmission lines. Controlled impedance is important for signal integrity and refers to the undistorted propagation of signals.
What do you mean by Carbon Contacts?
Carbon contacts are made of carbon ink and used for keyboard contacts, LCD contacts, and jumpers. The printing is performed using conductive carbon ink.
What do you mean by Hard Gold Tabs?
Gold contacts have different applications. Some are for an edge card connection and are plugged into a connection of some sort or motherboard. A card that is inserted and left for the longevity of its life cycle may have an immersion surface, whereas a card that is inserted and removed repeatedly should have a hard, gold-plated surface.
What do you mean by Special Build Up?
- A PCB is defined by the designer with a number of copper layers in a definite sequence that is known as Buildup or Board Buildup.
The pattern in each copper layer combined with the drill patterns and the copper plating of these drilled holes, form an electrical net that is responsible for connecting the pins of components to other pins of other components.
This makes it possible for the current to flow and the application to function.
- The Buildup or Board BUILDUP of a PCB is the sequence in which these copper layers are defined.
What do you mean by Bevelling?
Instead of a point which gets terminated at a flat edge, you get an effect of 45° ‘rounding out’ at the corner.
What do you mean by Production Lead Time?
The time is taken for the complete production, including the quality check, of the ready product.
What is Scoring?
Scoring for printed circuit boards is a V-groove that is cut into the top and bottom surfaces of an array configuration of multiple boards or a PCB with a removable frame or rails. When scoring is used, the PCBs are typically set up side by side and end to end with no gap between the edges.
What is the minimum clearance required from the PCB edge to Conductive Patterns in the case of Milling or Scoring?
It generally depends on the PCB’s design. But, we recommend a clearance of 5 mm to 7 mm.
What is an exception, and how do I resolve it?
When there is a material difference between the order details you provided and the Gerber Design, it is called an exception. It can result due to several reasons, one of which can be the fact that the design was beyond the manufacturer’s capabilities.
How do I reduce my technical exceptions?
You can do so by referring to the manufacturer's guidelines, technical capabilities, and design guidelines. Make sure you do all of this before the Gerber design process is initiated.
What is the meaning of the panel? What is Panel by PCB POWER/Customer?
Panel by PCB Power Market: The Gerber is designed in the PCB format, and the panel ups are decided as per your given requirements in line with the panel size.
Panel by Customer: The Gerber is designed in the panel form.
Do you have a standard stack up for Multi-Layer PCBs?
We are not following any standard stack up at PPM. If you need a special stack of requirements, we will follow the exact configuration as mentioned in your order if the materials are available in adequate quantities.
How do I check the feasibility of my PCB Data Set?
Please write to us on firstname.lastname@example.org with your Gerber data for DFM Check.
What is the use of a Stencil?
The function of the solder paste stencil is to accurately deposit the correct amount of solder paste onto the surface mount pads. This makes them, so a solder joint between the PCB pad and the component terminal is acceptable in terms of the electrical connection and the mechanical strength.
What are the different types of Stencil?
There are two types of stencils – Framed and Frameless.
What is a Framed Stencil?
PCB Power Market introduced framed stencils for SMT, semiconductor and solar industries. The fine grade polished SS technology ensures relatively no burrs on the hole walls and a mirror-like finish that helps the paste flow evenly across the surface. We guarantee aperture size accuracy of +-5um and positioning accuracy of +- 10um. For boards with fine pitch components, we recommend additional F3 Nano Coating for better throughput.
What is a Frameless Stencil?
Frameless SMT Stencils, also called foils, are laser-cut solder paste stencils designed to work with stencil tensioning systems known as reusable stencil frames. This particular type of Stencil works even if it is not permanently glued to the frame. Frameless stencils are significantly less expensive than framed stencils and provide money-saving storage while still delivering superior quality and performance.
Why do I need a different stencil for the Top & Bottom Side?
If the SMD components are on both the sides of the PCBs, the stencil paste has to be applied on both sides.
How does the thickness of the Stencil affect PCB Assembly?
The accurate thickness of the stencil sheet ensures the release of the desired amount of solder paste through the opening. The thickness of the sheet and aperture size are important factors that affect the amount of solder paste to be deposited on the board since extra solder deposition can cause solder bridging. On the other hand, less solder deposition can create weak solder joints, which affect the functionality of the final PCB board.
Can I reuse a stencil?
Yes. We fabricate metal stencils which are well-suited for repeated use.
Can I get a Stencil of a panelized Data?
Yes, you can fabricate a single stencil with different designs.
How do I decide on what Stencil Printer to use?
If you do not have the PPM Stencil Printer, please select the option "Others".
What is a Bill of Material?
A bill of materials or product structure is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts, and the quantities needed to manufacture an end product. A BOM may be used for communication between manufacturing partners or might be used for internal consistencies in a single manufacturing plant.
Where do you source your components from?
We source components from a range of industry-known suppliers like – Mouser, Element – 14, Digikey, and other genuine-parts suppliers.
Do you offer cost-effective prices?
Our processes work on high-efficiency levels and are powered by economies of scale. So, yes, we do offer very cost-effective prices.
Can you buy it from my supplier directly?
Yes. But we would request you to buy it and send it to the PPM for assembling.
Can I order only components?
Yes. You have the option of ordering just the components.
What is an SMD Component?
A surface-mount device or SMD is an electronic device for which the components are mounted or placed directly onto the surface of the PCB. An SMT component is usually smaller than its through-hole counterpart because it has either smaller leads or no leads at all.
What is a Through Hole Component?
Through-hole technology (also spelt "thru-hole"), refers to the mounting scheme used for electronic components that involve the use of leads on the components that are inserted into holes drilled in printed circuit boards (PCB) and soldered to pads on the opposite side by the manual assembly (hand placement).
What is a BGA Package?
BGA stands for Ball-Grid Array. It is a type of surface-mount packaging system primarily used for integrated circuits. This package is helpful in permanently mounting devices on microprocessors. It provides more interconnections than dual-line or flat packages.
What is a TQFP Package?
TQFP stands for Thin Quad Flat Packages and is suited for customers that are looking for cost-effective and yet standardized packages. You can still choose from a range of body sizes and lead counts to customize the package.
What do you mean by “Assembly Side”?
When we ask you to denote the ‘Assembly Side’, we are trying to understand on which side you want the components assembled – the top, the bottom, or both the sides.
What do you mean by “Stencil Side”?
You will need this information only if you have SMD components. If you are not using SMD components, none of the sides on your PCB would require a stencil.
Do you do the assembly on an Automatic Line?
Yes, we do have an in-house assembly pick & place unit at Gandhinagar, Gujarat.
MNCs And Major Buyers
Do You Supply PCBs Outside India?
Yes, we have historically supplied PCBs across the globe and would be glad to supply your order as well. Please bring this up with our Technical Sales Support Team at the time of placing the order.
Are Your PCBs Made With Global Standards Of Production?
We follow IPC Class 2 & 3 Standards, and our facility is ISO as well as UL certified.
Have You Worked With Any MNCs?
We consistently work with global operations which happen to be the leaders in their verticals. Most of our associations result in our team, helping them in building and assembling boards from the prototype to the production volume.
Do You Offer Referral Discounts?
We have several recurring orders and strong relationships with most of our customers. Hence, we treat the customer's recommendation as to the highest honor for our team. However, we are currently not running a dedicated referral program.
What Is The Largest Quantity Of PCBs You Can Supply In One Order?
We have the capacity to easily manufacture and assemble boards of up to 8 sq. meters in one order. However, if you are seeking a larger order quantity, we would be happy to evaluate your requirements and get back to you with a reasonable commitment.
We Have A Plan To Frequently Order PCBs. Is There A Form Of Special Pricing For Such Orders?
Yes. We offer 'No Minimum Order Quantity' and lower prices across our services and products.
We Are Seeking A Credit Facility For Buying PCBs. Do You Offer Such Financing Options?
You can email us at email@example.com. Our Accounts & Finance team will review your proposition and get back to you with a reasonable response.
Our PCB Designs Are Proprietary. Can You Protect The Confidentiality Of Our Designs?
Having been the partner to several electronics leaders across the globe, we understand, value, and respect the cost of innovation. We have optimized our entire infrastructure to maintain high standards of data integrity and security. Moreover, we would be happy to sign a comprehensive NDA with you.
Is There Special Pricing For Government Purchase Contracts?
Please send us your proposition at firstname.lastname@example.org. Our Accounts & Finance team will review it and get back to you at the earliest possible.
Do You Offer Tentative Prices For Tendering?
Yes, we can help you formulate a tentative budget for the order. Our team will require comprehensive details about the order before we can do so. Please reach out to our team at email@example.com , and our team will respond at the earliest possible.
Do You Offer Discounts On Bulk Orders?
We are connected with a fast-moving supply chain. Hence, the prices can vary based on time, required technology, the complexity of the order, and the quantity. For larger quantities, economies of scale can help you get lower per-unit costs.
Can You Provide A Letter Of Warranty For Your Products/services?
We provided a test report that showcases the quality standards of our offerings with every order manufactured at our facility.
We provide a test report with every order manufactured at our facility.
Have You Worked With Any Government Bodies Under Long-term Purchase Agreements?
Yes, we have historically worked and look forward to working with government bodies across India.