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2016 - 09 - 25
Application Industry: communicationApplication Product: Digital Fiber-Optic CommunicationLayers:8Finish : ENIGMaterial: FR4Outer Track W/S: 4/4milInner Track W/S: 3.5/3.5milBoard Thickness: 1.6mmMin. ...
2016 - 09 - 25
Application Industry: Industrial ControlApplication Products: Function BoardLayer: 16Surface Finish: ENIGMaterial: High TG FR4Outer Track W/S: 4/4milInner Track W/S: 3.5/3.5milBoard Thickness: 2.43mmM...
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说明: PCB fast prototyping manufacturability designThe technical specifications required for the manufacturability of PCBs are related to the development status of the manufacturing process technology of PCB rapid proofing manufacturers and the manufacturers of printed boards. For example, for PCBs with a wire width of 0.1 mm and a minimum through hole diameter of 0.3 mm, some pcb fast proofing manufacturers cannot process them, and only some manufacturers with good equipment and process conditions can process them. Some designers do not pay attention to these problems. They think that PCB can be designed and manufactured quickly, or that the layout and wiring design of the printed board is correct. Whether it can be manufactured is the production and process. The concept is wrong. Whe...
说明: How do material choices increase performance?   You would be hard pressed to find an RF device that does notutilize printed circuit board substrate material in one form or another. This is but one ofthe many building block materials needed in a given design. All decisions are focused on materials that improve signa loss operating temperature stability over temperature heat sinking and solderability. Yet the material sals one edto decrease attenuation frequency shift, and limit thermal loss.Essential materials Selections That Should Be Reviewed:.Printed Circuit Board (PCB) Substrates.PCB Copper Weight .PCB Surface Finishes.Machined Metal Materials.Machined Metal Surface Finishes.Dielectric And Gasket Materials.Circuit Interface Conductors And Insulation Types
案例名称: Rigid Flex Circuits
说明: Rigid Flex Circuits  At times, due to an application's requirements, the conventional rigid PCB cannot be used and in steps flex or rigid flex circuitry. As shown in Fig. 1 (below), a flex circuit is used in applications or products that have moving or mechanical parts. Flex circuitry is usually made of very thin 3 mil Kapton material.  Sometimes a board with a rigid and flex portion is required, Fig. 2 (below). Called a rigid/flex board, the rigid part remains stationary, while the flex section can move up and down or back and forth. Medical devices in particular use rigid/flex components, and some consumer items such as printer ribbon cables.  Like its rigid PCB counterparts, flex circuitry is available in single through multi-layer versions. It can be 18 to 20 layers. How...
说明: Micro BGA Gains Popularity for Wearable/IoT PCBs With the increasing demands for wearable and Internet of Things (IoT) devices, chipmakers are scrambling to yet pack even more circuitry into even smaller component packaging. The micro ball-grid array (BGA) package is a case in point. Fig. 1 shows micro BGA-packaged devices placed on a flex circuit for a medical electronics application. These tiny micro BGAs can house such complex circuitry as powerful processor chips or a system-on-a chip (SoC), for example.   Typical BGA packages have ball-to-ball spacing of 1.0mm or 0.8mm, whereas typical micro BGA packages have a pitch of about 0.4mm or less. This permits package size reduction, among other advantages, plus micro BGAs can be placed in close proximity on a flex circui...
说明: Perfect Thermal Profile for Wearable/IoT PCB   Creating a perfect thermal profile for a wearable/IOT PCB undergoing the reflow process is a challenge. That challenge is based on the fact wearable flex PCBs are smaller, and they don't have sufficient thermal mass compared to conventional rigid PCBs. Also, they have different thicknesses and when it comes to flex, even different thicknesses, where stiffeners are used. Conventional PCBs have certain amounts of copper and pre-pregs in the middle of the board. Those pre-pregs are of certain thicknesses, meaning they absorb a certain amount of heat, thus the thermal profile will greatly differ for a wearable PCB.    The important steps to follow to assure a perfect thermal profile for wearable PCBs are the following. The...
说明: To Be or Not To Be NSMD or SMD – that is the Question   Two types of land patterns used for surface mount (SM) pads are non-solder mask defined or NSMD pads and solder mask defined or SMD pads. Fig. 1 shows the difference between the two.   NSMD pads have the solder mask opening larger than the pads. On the other hands, SMD pads have the solder mask opening smaller than the copper pad.   Most EMS providers suggest that NSMD be used because it provides tighter control of copper artwork registration compared to the positional tolerance of the solder masking process.   Moreover, SMD pad definition may introduce stress concentration points that may result in solder joint cracking under extreme fatigue conditions.   For NSMD, the pad size is typ...
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