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PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product

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PCB Assembly

  • High Precision PCB Assembly suppliers

Introduction:
We also have ability for PCB layout ,PCBA and Circuit assembly, specializes in producing the various electronic products based on your customized designs and do pcba,pcb assembly for all kinds of small ,medium Volume electronic products
Enabling you to focus on product development and sales, we can solve your production technology issues and take care of product quality
The operation we can handle for you is from the Bare pc board fabrication, full component procurement, SMT/BGA/DIP assembly, mechanical/case assembly, rubber molding, functional testing, repair, inspection of finished goods to shipment arrangement.

 

 

PCB Prototype Engineering services :
DFM, DFT, DOE
Develop control plans
Value add engineering services

PCB Prototype Assembly services:
NPI
SMT: Surface mount assembly, single & double-sided
Plated through-hole,Selective soldering
– Mixed technologies: SMT, through-hole, electro-mechanical assembly

PCB Assembly Sample Introduction

PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product

China PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product Supplier
PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product Supplier PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product Supplier PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product Supplier

Large Image :  PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product

Product Details:

Place of Origin: China
Brand Name: XCE
Certification: CE,ROHS, FCC,ISO9008,SGS
Model Number: XCEPCBA

Payment & Shipping Terms:

Minimum Order Quantity: 1pcs
Price: negotiation
Packaging Details: inner: vacuum-packed bubble bag outer: carton box
Delivery Time: 5-10 days
Payment Terms: T/T,Western union
Supply Ability: 1, 000, 000 PCS / week
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Detailed Product Description
Cu THK: 1OZ Surface Finish: HASL Lead Free
Material Raw: FR4 2 Layer Processing: SMT
Solder Mask: Green,white Silk Screen Board Size: 10*5cm

Specification:

PCBA QC X-Ray,AOI test
Service PCB,PCBA
Surface finishing HASL,Lead free
Material raw FR4
Cu thickness 1OZ
Processing SMT
Line space 8mil
Line width 8mil

 

Parameter

1

Layer

2 layer

2

Material

FR-4 lead free

3

Board thickness

1.2mm

4

Finished board side

40*20mm

5

Min.drilled hole size

0.25mm

6

Min.line width

0.25mm

7

Min.line spaceing

0.25mm

8

Surface finish/treatment

HALS/HALS lead free

9

Copper thickness

0.5-4.0oz

10

Solder mask color

green/black/white/red/blue/yellow

11

Inner packing

Vacuum packing,Plastic bag

12

Outer packing

Standard carton packing

13

Hole tolerance

PTH:±0.076,NTPH:±0.05

14

Certificate

UL,ISO9001,ISO14001,ROHS,CQC

15

Profiling Punching

Routing,V-CUT,Beveling

16

Assembly Service

Providing OEM service to all sorts of printed circuit board assembly

 

PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product

 

There are two types of mounting technologies are prevailing in the modern PCBA industry:
Surface Mount Technology: Sensitive components, some very small, such as resistors or diodes are placed automatically onto the surface of board. This is called SMD assembly, for surface mount device. Surface mount technology can be applied on small size components and integrated circuits (ICs). For example, PCBCart is capable of mounting package with min. size 01005, which is even smaller than the size of a pencil point.


Thru-Hole Technology: works well on components with leads or wires that have to be mounted on board by plugging them through holes on board. The extra lead part has to be soldered on the other side of the board. This technology is applied on PCB assemblies containing large components such as capacitors, coils to be assembled.

 

PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product

 

Step 1: Solder Paste Stenciling
The first step of PCB assembly is applying a solder paste to the board. This process is like screen-printing a shirt, except instead of a mask, a thin, stainless-steel stencil is placed over the PCB. This allows assemblers to apply solder paste only to certain parts of the would-be PCB. These parts are where components will sit in the finished PCB.

 

The solder paste itself is a greyish substance consisting of tiny balls of metal, also known as solder. The composition of these tiny metal balls is 96.5% tin, 3% silver and 0.5% copper. The solder paste mixes solder with a flux, which is a chemical designed help the solder melt and bond to a surface. Solder paste appears as a grey paste and must be applied to the board at exactly the right places and in precisely the right amounts.

 

In a professional PCBA line, a mechanical fixture holds the PCB and solder stencil in place. An applicator then places solder paste on the intended areas in precise amounts. The machine then spreads the paste across the stencil, applying it evenly to every open area. After removing the stencil, the solder paste remains in the intended locations.

 

Step 2: Pick and Place
After applying the solder paste to the PCB board, the PCBA process moves on to the pick and place machine, a robotic device places surface mount components, or SMDs, on a prepared PCB. SMDs account for most non-connector components on PCBs today. These SMDs are then soldered on to the surface of the board in the next step of PCBA process.

 

Traditionally, this was a manual process done with a pair of tweezers, in which assemblers had to pick and place components by hand. These days, thankfully, this step is an automated process among PCB manufacturers. This shift occurred largely because machines tend to be more accurate and more consistent than humans. While humans can work quickly, fatigue and eyestrain tends to set in after a few hours working with such small components. Machines work around the clock without such fatigue.

 

The device starts the pick and place process by picking up a PCB board with a vacuum grip and moving it to the pick and place station. The robot then orients the PCB at the station and begins applying the SMTs to the PCB surface. These components are placed on top of the soldering paste in preprogrammed locations.

 

Step 3: Reflow Soldering
Once the solder paste and surface mount components are all in place, they need to remain there. This means the solder paste needs to solidify, adhering components to the board. PCB assembly accomplishes this through a process called "reflow".

 

After the pick and place process concludes, the PCB board is transferred to a conveyor belt. This conveyor belt moves through a large reflow oven, which is somewhat like a commercial pizza oven. This oven consists of a series of heaters which gradually heat the board to temperatures around 250 degrees Celsius, or 480 degrees Fahrenheit. This is hot enough to melt the solder in the solder paste.

 

Once the solder melts, the PCB continues to move through the oven. It passes through a series of cooler heaters, which allows the melted solder to cool and solidify in a controlled manner. This creates a permanent solder joint to connect the SMDs to the PCB.

 

Many PCBAs require special consideration during reflow, especially for two-sided PCB Assembly. Two-sided PCB assembly need stenciling and reflowing each side separately. First, the side with fewer and smaller parts is stenciled, placed and reflowed, followed by the other side.

 

Step 4: Inspection and Quality Control
Once the surface mount components are soldered in place after the reflow process, which doesn't stand for completion of PCBA and the assembled board needs to be tested for functionality. Often, movement during the reflow process will result in poor connection quality or a complete lack of a connection. Shorts are also a common side effect of this movement, as misplaced components can sometimes connect portions of the circuit that should not connect.

 

Step 5: Through-Hole Component Insertion
Depending on the type of board under PCBA, the board may include a variety of components beyond the usual SMDs. These include plated through-hole components, or PTH components.

 

A plated through-hole is a hole in the PCB that's plated all the way through the board. PCB components use these holes to pass a signal from one side of the board to the other. In this case, soldering paste won't do any good, as the paste will run straight through the hole without a chance to adhere.

 

Instead of soldering paste, PTH components require a more specialized kind of soldering method in later PCB assembly process:
• Manual Soldering: Manual through-hole insertion is a straightforward process. Typically, one person at a single station will be tasked with inserting one component into a designated PTH. Once they're finished, the board is transferred to the next station, where another person is working on inserting a different component. The cycle continues for each PTH that needs to be outfitted. This can be a lengthy process, depending on how many PTH components need to be inserted during one cycle of PCBA. Most companies specifically try to avoid designing with PTH components for this very purpose, but PTH components are still common among PCB designs.
• Wave Soldering: Wave soldering is the automated version of manual soldering, but involves a very different process. Once the PTH component is put in place, the board is put on yet another conveyor belt. This time, the conveyor belt runs through a specialized oven where a wave of molten solder washes over the bottom of the board. This solders all of the pins on the bottom of the board at once. This kind of soldering is nearly impossible for double-sided PCBs, as soldering the entire PCB side would render any delicate electronic components useless.

 

After this soldering process is finished, the PCB can move on to the final inspection, or it can run through the previous steps if the PCB needs additional parts added or another side assembled.

 

Step 6: Final Inspection and Functional Test
After the soldering step of the PCBA process is finished, a final inspection will test the PCB for its functionality. This inspection is known as a "functional test". The test puts the PCB through its paces, simulating the normal circumstances in which the PCB will operate. Power and simulated signals run through the PCB in this test while testers monitor the PCB's electrical characteristics.

 

PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product

PCB Manufacturing And SMT DIP Electronic Components AssemblyCustomized 2 Layer Product

 

Contact Details
Shenzhen Xinchenger Electronic Co.,Ltd

Contact Person: Ms. karen

Tel: 86-755-26055813

Fax: 86-755-26055946

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