4-layer PCB-深圳市海博精密电路有限公司

高品质 4 层 PCB，价格极具竞争力

Material Science: FR4、 Metal core, ceramic FR4 hybrid, polyimide, high-speed, high-frequency PTFE
PCB types: rigid PCB, flexible PCB, rigid flexible combination PCB
Mechanical and laser drilling of blind and buried holes
Passed ISO9001: In 2015 ISO13485: 2016 certification and UL certification
IPC 600 Level 2 and Level 3
100% electronic testing, AOI inspection, and visual inspection

在要求不断提高的 PCB 行业中，4 层 PCB 成为行业中最常用的方向之一。4 层电路板在复杂性、性能和成本之间实现了完美平衡。4 层 PCB 也很重要，因为许多高级功能（例如内层铜、阻抗控制、层堆叠以及盲孔和埋孔（用于 HDI））在 4 层之后开始适用（尽管 4 层即可，但建议在 6 层及以上应用 HDI）。这些功能是工业设计要求 PCB 至少有 4 层的原因。

什么是4层PCB？

4 层 PCB 是一种类似于电子电路系统中的三明治结构，由三种不同的材料组成：铜、基板和预浸料。它由导电印刷电路板 (PCB) 层组成，这些层在预浸料分离后逐层排列。然后在高温下压缩所有层以将它们融合在一起，形成坚固的 4 层电路板结构。

不同类型的 4 层 PCB 堆叠

堆叠是 PCB 设计师和 PCB 制造商用来定义 PCB 中使用的铜层和电介质层的时间顺序的术语。当我们说 4 层电路板时，我们的意思是 PCB 有 4 个适合布线的铜层。虽然有许多预定义的堆叠推荐用于许多应用，但可以根据要求使用任何层的排列和组合。一些堆叠用于刚性PCB是：-

信号 – 地 – 电源 – 信号: – 这是 4 层电路板中最常用的堆叠类型。这种堆叠类型使用通孔可以轻松访问电源和接地平面。由于内部层接地，最近的外部层（在本例中为顶层）可以使用受控阻抗轨道使用高速信号和不同的协议。不建议在最靠近电源平面的层（在本例中为底层）上布线高速信号。大多数通用 4 层 PCB 板都采用这种堆叠，因为它简单且易于布线，因为信号平面周围的电源和接地线被消除，只需要靠近焊点的通孔。

请注意，电介质可以根据要求采用预浸料或芯材，大多数情况下，中间电介质用作芯材，其他电介质用作预浸料。在高速信号中，芯材用于中间层而不是预浸料，以获得更好的信号完整性，但在单个 4 层电路板中添加多个芯材的成本更高。

信号 – 接地 – 接地 – 信号: – 这种方向相当常见，用于在顶层和底层布线高速信号或需要受控阻抗的信号。这种方法还可以减少不同层中不同高速信号之间的串扰。然而，在这种堆叠中布线具有挑战性，因为当使用受控阻抗走线时，受控阻抗走线下方的层必须没有任何走线以保持参考平面的一致性。小型以太网集线器和 GPS 信号利用板使用这种堆叠，因为它具有出色的信号完整性和阻抗控制。

有人可能会问，在这个方向上电源层在哪里？没有必要有专门的电源层。虽然有电源层使布线变得容易，但当没有剩余的层时，可以根据方便在任一信号层或两个信号层上布线电源走线或灌线。

信号 – 接地 – 信号 – 接地: – 这种堆叠很少使用，因为没有布线优势。当有信号需要保护免受噪声和 EMI 的影响时，使用此堆叠。受保护的信号通过夹在接地层之间的层进行布线。处理模拟信号或在受 EMI 侵扰的环境中使用噪声敏感的高速信号时，使用此堆叠。

信号 – 电源 – 电源 – 信号：当需要为 PCB 上分散的元件提供 2 种不同的电压时，使用此堆叠。很多时候，单个元件需要两个或更多电压，这种方向在使用此类元件时可简化布线。接地通过多边形灌注或布线迹线穿过 PCB 的信号层。

您可以根据对需求的理解，在 4 层 PCB 中使用所有层堆叠的排列组合。虽然不是强制性的，但建议在使用 SMD 元件时将顶层用作信号层，因为 SMD 元件将始终放置在顶部（有时也在底部），并且此类元件需要过孔将其布线到不同的平面。此类限制不适用于通孔元件，因为它们可以在任何层中布线而无需使用过孔。

Advantages of Four Layer PCB

As the most commonly used multi-layer direction, 4-layer circuit boards have many advantages, making them very popular in the industry. Some advantages of using a 4-layer circuit board are:

Using advanced PCB design technology: - Many advanced features, such as impedance control HDI、 The weight difference between the dedicated power supply and grounding layer, as well as the inner and outer copper layers. This makes the 4-layer PCB a versatile choice for various use cases, such as high-speed, high-power, analog signal, mixed signal, and compact design applications.

Balance between cost and complexity: A 4-layer circuit board supports most functions of PCBs with 6 or more layers. Therefore, it can obtain advanced functions at a lower cost than 6-layer PCBs. Due to the reduction in layers, even the cost of HDI and impedance control functions is lower.

Improved design flexibility: Compared to 2-layer PCBs, 2-layer PCBs have more wiring options. Wiring is simpler and more organized, making PCB debugging easier. The introduction of dedicated grounding and power layers provides more space for signal wiring and components, which can be used for denser placement of components or better thermal management.

Enhanced signal integrity: The 4-layer circuit board has higher signal integrity due to its dedicated grounding layer and impedance control support. Many studies and experiments have shown that even if the component orientation is exactly the same as that of a 4-layer PCB, the signal integrity of a 2-layer PCB is better.

Improved thermal management: A simple rule applies to all PCBs, the more copper there is in the PCB, the better the thermal management of the entire PCB. Compared to a 2-layer PCB, adding 2 layers of copper will improve thermal efficiency. The dedicated grounding layer and power layer help to evenly distribute heat throughout the PCB. The 4-layer circuit board can also choose to add copper to the inner layer, so thermal management can also be controlled by increasing or decreasing the weight of copper.

Improving mechanical strength: The four layer PCB contains a large number of pre impregnated materials and copper layers, which can enhance the mechanical integrity of the PCB.
Key factors affecting the cost of 4-layer PCB

The cost calculation of a 4-layer PCB is significantly different from that of a 2-layer PCB. There are many factors that can affect the cost of a 4-layer circuit board, some of which include:

The use of impedance control: Using impedance control will increase the cost of a 4-layer circuit board. Impedance control requires precision manufacturing and multiple tests to confirm the required accuracy.

Layer stacking: A 4-layer circuit board can have various combinations of dielectric layers and copper layers. For example, having more than one core will increase the cost of PCB.

Using advanced technology: The use of HDI and other advanced features will significantly increase the cost of PCB. Using HDI not only introduces finer wiring, but also increases costs by adding blind holes on the PCB.

Copper weight: The weight of copper used accounts for a significant portion of the cost of a 4-layer PCB. The more copper is used, the higher the cost of PCB. The amount of copper used depends on the expected current and the signal integrity of the PCB.

Other factors such as shape and size, surface finish, order quantity, materials used, etc. remain unchanged for all PCBs.
WHY CHOOSE US

If pursuing cost-effective FPC manufacturing services, choosing a Chinese manufacturer is the best choice. As a manufacturing powerhouse, China has abundant resources, cheap labor, and a large number of technical personnel. We recommend Haibo, a Chinese FPC assembly service provider with over 10 years of experience, who has performed outstandingly in various aspects

Efficient and reasonable quotation:There is an efficient quotation process to assist you in making decisions, providing reasonable prices and highly competitive quotes in China.
High quality and reliable products:Produce high standard printed circuit boards, manufacture and test according to specifications, international standards, and internal controls, and conduct pre production inspections to ensure robust processes.
Quick and on-time delivery:The assembly equipment is in good condition, with high productivity, minimal downtime, short delivery time, and also provides urgent services.
Timely and effective response:Always respond to customer needs, provide accurate information, answer questions through multiple channels, and offer one-stop services.
Strong technical strength:China's FPC manufacturing technology is leading, and Haibo has a complete SMT solution that covers assembly, inspection, and other capabilities. It also provides prototype production and customization services.
Front desk

Office pictures

Office pictures

Workshop pictures

Workshop pictures

SMT surface mount machine

SMT surface mount machine

SMT Online AOI Inspection Machine

VCP coated copper wire

X-RAY inspection machine

Aobao AOI Inspection Machine

Aobao AOI Inspection Machine

Flying Probe Tester

Flame laser machine

Mechanical drilling machine

Mechanical drilling machine

Mechanical drilling machine

Golden Statue Microscope

Fully automatic exposure machine

Fully automatic exposure machine

Fully automatic laminating machine

Developing etching lines

Impedance tester

Common Questions

What does Haibo do?

Haibo is a PCB board manufacturer that provides small and medium batch PCB circuit board, PCB assembly, and electronic manufacturing services, including electronic design, PCB layout, SMT and through-hole assembly, material procurement, final packaging, and project management. Finally, provide high-quality products and services.
What are the benefits of outsourcing my product to Haibo?

Since 2017, we have been a PCB supplier in China, and we have many customers who have been cooperating with us for more than 10 years! We demand that they provide the benefits of being a partner, which is simple: we are trustworthy! During the RFQ process, our CAM engineers will carefully examine all details and raise questions to avoid errors in the future. When customers order PCBs or PCB assemblies from us, we are always able to deliver high-quality products on time.
As a Chinese PCB manufacturer, our factory has obtained UL (E358677) and ISO9001:2015 certifications. We use our professional manufacturing and procurement knowledge and experience to help customers reduce operating costs and delivery requirements.
Does Haibo accept prototypes or small batch orders?

Yes, absolutely so. Since our establishment as a Chinese PCB manufacturer in 2007, we have been focusing on small and medium batch PCB manufacturing and assembly. All of our equipment and personnel are arranged to achieve this goal.
Do you offer fast production?

Yes, we are one of the most trusted circuit board suppliers in the fast PCB field, so we are happy to provide our customers with fast production support. The delivery time is as follows:
PCB bare board: 1-3 working days;
Turnkey PCB assembly: 1-2 weeks.
Does your PCB comply with RoHS and REACH standards?

Yes, all of our printed circuit boards comply with RoHS and REACH requirements. Please visit www.haibofpcba.cn to view our RoHS and REACH compliance statements.
Can you ship the PCB to us?

yes. We can deliver PCBs to your location via express delivery (UPS, FedEx, or DHL), regular air and sea freight. As an experienced PCB board manufacturer, we can ship products to anywhere you want. Please follow this webpage link to learn about our transportation policy:// www.haibofpcba.cn。
Can you produce PCBs that meet IPC Level 3 standards?

Yes, as one of the professional PCB manufacturers, we can produce PCBs according to IPC-A-600 Level 3 and assemble PCBs according to IPC-A-610 Level 3.
Is Haibo a reliable PCB manufacturer?

of course! Haibo has been engaged in PCB manufacturing business since 2017. It has obtained many international quality certifications, such as ISO9001, ISO13485, UL (E358677), etc. For over a decade, many major global brands have trusted Haibo
What is the minimum order quantity for your PCB production?

As a professional supplier of small and medium-sized circuit boards, we do not have a minimum order quantity. We are a printed circuit board manufacturer specializing in sample manufacturing and small to medium batch production. We can produce PCBs from one piece and fully assemble PCBA; For us, no order is too small.
Does Haibo provide engineering assistance?

As a Chinese PCB supplier with over 10 years of experience, our engineers evaluate existing designs and assist in optimizing manufacturability (DFM) for new designs, thereby minimizing costs and shortening product time to market.
What is the expected delivery cycle for standard production operations?

As a professional PCB manufacturer in China, our average delivery time is as follows:
PCB： 3-10 working days;
PCB assembly: 2-4 weeks;
Complete turnkey electronic assembly: 4-6 weeks.
This depends on the delivery cycle, specifications, and complexity of materials and parts.
How long will it take for me to receive a complete quotation?

Our standard delivery cycle for your RFQ is:
PCB bare board: 1 to 2 working days;
Circuit board assembly including component procurement: 1-3 working days;
Complete turnkey box assembly: 3-10 working days.
As an experienced Chinese PCB factory, if you urgently need it, we can also provide you with a quotation within a few hours.
What documents are required to produce my printed circuit board?

As a PCB circuit manufacturer, we need PCB files (preferably in Gerber format) that include specifications such as PCB material, circuit board thickness, stacking, copper thickness, surface finish, and the quantity you require.
What documents do you need to quote for PCB assembly services?

Electronic circuit board manufacturers like us always require a bill of materials, Gerber data, and quantity forecasts. If you have any questions, please contact us via email: haibo_fpcba1668@163.com .
What information do you need to quote for a complete turnkey component?

As a printed circuit board manufacturer, we require your complete data package (including Gerber files, BOM list, assembly instructions, etc.), quantity forecast, and budget. If you have any questions, please contact us via email: haibo_fpcba1668@163.com .
How to submit a Request for Quotation (RFQ)?

Please send your inquiry directly to our sales team email: haibo_fpcba1668@163.com
Alternatively, you can visit our sales team page and contact our sales personnel:// www.haibofpcba.cn
Is Haibo a Chinese PCB manufacturer?

Yes, Haibo is a Chinese PCB manufacturer. By utilizing advanced electronic component technology and the labor advantage of Shenzhen, China, Haibo supplies high-quality printed circuit boards at low cost.