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Immersion Gold / ENIG / Immersion Silver / Immersion Tin / Palladium / OSP / ROHS HAL / HASL Leaded / Electrolytic Gold Finger / Laser Drilling / Laser Routing / Copper filled Micro-Vias/

Posted on 18/12/2015

PCB Global now offer UPS as well as DHL Express freight service online for your convenience, along with the option to select your own freight courier. The addition of UPS freight service is to improve the express delivery time to various regions around the world. 

Depending on the quality of the PCB design file package received, PCB Global’s Computer Aided manufacturing (CAM) Engineering department will invariably have a few Engineering Questions, also know as, EQ’s to confirm. One example of a typical EQ is shown below:

Non-Plated Through Hole Cutting into Copper

EQ from CAM:

These 2 non-plated through holes during CNC drilling will intrude and cut into the copper Surface-Mount Technology (SMT) pads as highlighted below (see image).

Explanation:

As a rule, SMT pads must not to be cut or drilled especially with a non-plated hole as this process is fabricated during the final route stage when all the surface finish (immersion Gold, HASL, OSP, Immersion Silver, etc.) has been applied. Therefore, drilling now will result in an exposed copper area on the SMT pads.

Resolution:

In this case with the customer’s approval we shaved the SMT pads by 2mil to ensure no exposed copper.

 

For further tips and information when designing and laying out your printed circuit board design file please do not hesitate to contact our PCB Global team at sales@pcbglobal.com

 

Once the customer order and PCB design file is received the PCB Global production engineering team will process the manufacturing data which is required at every stage of PCB fabrication. This ensures that your Printed Circuit Boards are manufactured to your specifications. There are multiple combinations when it comes to PCB finishes and specifications. Listed below is an example of a typical 4-layer multi-layer data required on a job card to ensure that all customer manufacturing conformance is adhered to:

PART NUMBER– PCB GLOBAL 123456-A

LAYER – 4 layer

QUANTITY– 512pcs

PRODUCTION PANEL SIZE– 450 x 650 mm

PRODUCTION PANEL QUANTITY- 32

UNIT SIZE– 90 x 150 mm

PANEL SIZE– 300 x 200 mm

BOARDS PER PANEL– 4

MATERIAL– FR4 High TG=170 - S1170

PCB THICKNESS– 1.6mm

COPPER FOIL– 18um Copper

PRE-PREG– 7628HR RC: 47% 0.21mm

CORE – 1.0mm 35/35um Copper

SOLDER MASK COLOUR– Blue

COMPONENT LEGEND COLOUR–  Yellow

SURFACE FINISH– Immersion Gold – ENIG 2-3u”

PROFILING– Panel route with break tabs

This break-down ensures that the operators at each stage of fabrication will assume the precise finishes required on this part number as it flows through the production line. A typical workflow for a standard 4-layer through the PCB Global processes is demonstrated through many small processs.

Firstly the inner layer material is cut and the inner layer laminating and exposure is completed. Developing, etching and AOI inspection is the followed up by copper foil and pre-preg cut and multilayer lamination and pressing. Next the CNC drilling will take place in preparation for Desmear and Electrolysis Copper plating. Once this is complete, laminating and exposure is pattern plaited (Copper & Tin/Lead) and etched with a further AOI Inspection. LPI solder mask along with the component legend silkscreen is applied and then sent to bare board testing. Immersion gold is added with a further CNC routing. The boards are then clarified with deionised water before the final QA. The boards are then packed and dispatched to your requested delivery address.

Posted on 25/09/2015

PCB Global manufacture 1 layer, 2 layer and the high tech 4 layer Aluminium PCB’s for the worldwide electronics manufacturing industry. Applications for Aluminium PCB’s are found predominantly in the lighting, motor drives, relays, automotive, power conversion and 3D printer industries. Using Aluminium PCB Technologies assists in lower equipment operating temperatures which improves the LED’s with consistent colour and brightness, in turn, increasing the LED component life.

For solid state relays Aluminium PCB’s offer great thermal efficiency and are mechanically robust for all heavy industry applications. The correct dielectric choice will also provide the electrical isolation required to maintain operating parameters and meet safety regulations as well. Currently 80% of all Aluminium PCB’s are manufactured as 1 layer with the lighting industry being the largest consumers.

The stack as illustrated below consists of:

Base Metal Layer:Aluminium – generally 1.0 to 2.0mm thickness, 1.5mm being the standard.

Dielectric Layer:Not only to bond the copper circuit layer to the aluminium but more importantly offer the required electrical isolation with minimal thermal resistance.

Copper Foil:As per any standard printed circuit board, the copper foil will be processed and etched to the required circuit layer design.

PCB Global offer the above technologies for Aluminium Printed Circuit Boards on our easy to use online portal -  http://www.pcbglobal.com/quote/aluminium-pcbs/

Printed Circuits Boards are cleverly designed items that are used to not only connect electronic components but also mechanically support the functions of many electronic devices. The market for bare PCB’s worldwide was valued at $60.2 Billion in 2014 (US). Components are connected and operated by the conductive pathways, tracks or what is known as signal traces which are etched from copper sheets. This connection is made possible by the distinction between the copper sheets and the non-conductive substrate laminated on to the board. The resistance of the board is determined by the width and the thickness of the traces that expose the copper. The use of the board is also considered when inserting the tracks and traces for example some power and ground traces are usually wider then signal traces. The size and capability of these tracks and traces are described as impedance control. PCB Global not only delivers Printed Circuit Boards to your specifications, we can also assist with your impedance control requirements with predetermined layer stack up including track width and spacing recommendations to ensure impedance matching.

FR4 (Flame Resistant 4) is the most commonly used epoxy which is a woven fiberglass cloth impregnated with the epoxy resin. It has good insulation properties with good arc resistance making it very useful to both single and multilayer boards. The copper is laminated onto the FR4, providing a greater distinction of the conductive pathways as previously described that the FR4 has a high insulation effect. Multilayer PCB’s will have multiple layers of materials which will be laminated together. In some cases, multilayer boards may be required to contain a solid copper layer to act as a shield or ‘ground plane’ for power return.

Copper thickness in any single or multilayer PCB will determine the current-carrying capacity of the board. It is preferable to use heavier copper to increase the carrying capacity as well as increase the resistance of thermal strains. 1oz and 2oz copper are the preferred and more common choices for many single and multilayer PCB’s. Chemical etching is a process using lead and tin to electroplate the copper to increase the thickness. This is achieved by a mixture involving either ammonium persulfate or ferric chloride. The purpose of the chemical etching is to etch away the excess copper on the areas that should not contain copper. The solder, tin, gold or nickel used to plate the PCB acts as a corrosion resistant coating/barrier. The most common method is hot air solder levelling or HASL.

Components such as resistors, capacitors and active devices are usually soldered onto the bare PCB. In some cases, more advanced PCB’s will have their components embedded in the substrate. This offers greater connection and conduction, advancing the function of the loaded PCB. Components embedded throughout different layers of the PCB are made possible by the connection of vias. Multilayer PCB’s in this case will always allow for a higher conduction through component density. In the case that the board does not have any embedded components as described above, the more correct terminology for this item is know as a Printed Wiring Board (PWB) or Etched Wiring Board. It is common for the PWB to be known as a Printed Circuit Board or PCB.

Through-hole technology is the method commonly used to mount electronic components by leads on the boards. The components are soldered onto the copper traces usually on both sides of the board. The soldering can either be done manually or by a wave soldering machine which increases the efficiency. Surface mount technology (SMT) is another method by which the components were redesigned to enable more efficient soldering on the PCB rather then passing wires through the board. This also allows for smaller PCB assemblies and enables a higher density of circuits. PCB Assembly is also known as ‘PCBA’. Assembled PCB’s can be very sensitive to static therefore is placed in anti-static bags during transport to their destinations. When handled, the person must be earthed as the accumulation of static can damage or destroy the components.

Contact the team at PCB Global or proceed to the online quote page for your free and instant quotation today!

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