LED market gradually stabilized Taiwan factory Guangrong said that January has canceled unpaid leave

In October 2011, Guanglu announced the implementation of unpaid leave in response to the sluggish LED market. The company said that due to the gradual stabilization of the market, unpaid leave was cancelled in early January 2012, and production line employees resumed normal work.

The manufacturer's reaction was originally bad for 1Q12, but the actual situation was more moderate than expected. Recently, there have been cases of transfer orders and restocking. Panel manufacturers, LED factories such as Yiguang and others have received urgent orders, not only canceling unpaid leave. And even want employees to work overtime.

The industry pointed out that the transfer-to-order effect is related to the current changes in the production environment in the mainland. Especially after the return of the labor during the Spring Festival holiday, the mainland government encouraged the inland development, resulting in the lack of work in factories along the coast, and even the lack of electricity and water shortage. Therefore, some operators began to transfer orders back to Taiwan for production. It can be expected that the urgency situation will become the norm.

 

6 Layer PCB - stackup & prototype & price & manufacturing

What is 6 layer PCB?

6 layer PCB Board is, in general, a 4 Layer PCB Board with 2 extra signal layers added between the planes. The 6-layer PCB classic stackup includes 4 routing layers (2 outer layers + 2 internal layers) and 2 internal planes (one for ground and the other for power). This enhances the EMI dramatically by offering 2 buried layers for high-speed signals and 2 surface layers for routing low-speed signals. The signal layers should be closed to the adjacent planes.

6 Layer PCB Stackup and Design

What is PCB stack UP?

Why do PCBs stack up?

The irreversible development of modern electronic products has increasingly pushed PCB towards such needs as miniaturization, light weight, high speed, better functionality and reliability, and longer life, which has led to the popularity of multi-layer PCB. Two or more Single Sided PCB and/or Double Sided PCB are stacked together by a combination of semi-solid adhesives called "prepregs" to form multilayer PCBs through reliable predefined interconnections between them. There are three or more conductive layers in a Multilayer PCB , two of which are outside, and one is synthesized in an insulating board. With the increasing complexity and density of PCB, some problems may arise, such as noise.

6 Layer PCB stackup

6 layer 1.6 MM standard stackup and thickness

One stack-up NOT to use on a six-layer PCB board is the one shown in Figure 1.  The planes provide no shielding for the signal layers, and two of the signal layers (1 and 6) are not adjacent to a plane.  The only time this arrangement works even moderately well is if all the high frequency signals are routed on layers 2 and 5 and only very low frequency signals, or better yet no signals at all (just mounting pads), are routed on layers 1 and 6.  If used, any unused area on layers 1 and 6 should be provided with "ground fill" and tied into the primary ground plane, with vias, at as many locations as possible.

Fig. 1 One of the stackup methods of 6-layer PCB

This configuration satisfies only one of our original objectives. 

With six layers available the principle of providing two buried layers for high-speed signals is easily implemented as shown in Fig. 2.  This configuration also provides two surface layers for routing low speed signals.

Fig. 2  Less common 6 layer PCB stackup

This is a probably the most common 6 layer PCB stack-up and can be very effective in controlling emissions, if done correctly.  This configuration satisfies objectives 1, 2, & 4 but not objectives 3 & 5.  Its main drawback is the separation of the power and ground planes.  Due to this separation there is no significant interplane capacitance between power and ground  Therefore, the decoupling must be designed very carefully to account for this fact.

Not nearly as common, but a good performing stack-up for a six-layer PCB is shown in Fig. 2. 

Fig. 3 Another performing six-layer PCB board stackup

H1 indicates the horizontal routing layer for signal 1, and V1 indicates the vertical routing layer for signal 1.  H2 and V2 represent the same for signal 2.  This configuration has the advantage that orthogonal routed signals always reference the same plane. The disadvantage is that the signals on layer one and six are not shielded.  Therefore the signal layers should be placed very close to their adjacent planes, and the desired board thickness made up by the use of a thicker center core.  Typical spacing for a 0.060" thick board might be 0.005"/0.005"/0.040"/0.005"/0.005".  This configuration satisfies objectives 1 and 2, but not 3, 4, or 5. 

Another excellent performing six-layer PCB board stackup is shown in Fig. 4. It provides two buried signal layers and adjacent power and ground planes and satisfies all five objectives.  The big disadvantage, however, is that it only has two routing layers -- so it is not often used. 

Fig. 4 Another excellent performing six-layer PCB board stackup

It is easier to achieve good EMC performance with a six-layer circuit board  than with a four-layer circuit board.  We also have the advantage of four signal routing layers instead of being limited to just two.  As was the case for 4 layer PCB boards, it is possible to satisfy four of our five objectives with a six-layer PCB.  All five objectives can be satisfied if we limit ourselves to only two signal routing layers.  The configurations of Figures 2, 3, and 4 all can all be made to perform very well from an EMC point of view. 

6 Layer PCB Stackup for EMI/EMC

EMI/EMC Return Current 6 Layer PCB Issue

EMI/EMC Return Current 6 Layer PCB Solved

Types of 6 PCB stack up-how to choose?

PCB materials and stackup thickness commonly used in multilayer circuit boards.

6 Layer PCB Quote and Price

6  L ayer PCB  Prototype Price

6 Layer PCB Manufacturing

Why order 6 layer PCB from JHY PCB? 

You will get it after check below advantages.

1. Good quality and price: We are experienced in producing six layer PCB, cost and time can be controlled well. This can help our customer to order good boards in cost-effective price.

2. Short Turnaround Times:

3. No Minimum Quantity: 1 pcs of PCB can be offered.

4. More orders, more discount.

5. Custom PCB Sizes

6 Layer PCB

Printed Circuit Boards,6 Layer PCB,6 Layer PCB Price,6 Layer PCB Prototype

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