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SMT Packages

With over 20 years' experience in this industry, we can provide one-stop solutions for customers including PCB fabrication, components procurement and PCB Assembly services. Owing to stringent manufacturing rules and regulations, increasing technological knowledge and enthusiasm to strive for the latest technologies, we have accumulated numerous capabilities to deal with different types of component packages such as BGA, PBGA, Flip chip, CSP and WLCSP.

BGA

BGA, short for ball grid array, is a form of SMT (Surface Mount Technology) package that is increasingly used in integrated circuits (ICs). BGA is beneficial to the improvement of solder joint reliability.


BGA exhibits the following advantages:


• Efficient application of PCB space


BGA package places connections beneath SMD (Surface Mount Device) package instead of around it so that space can be largely saved.


• Improvement in terms of thermal and electrical performance


Since BGA package helps to reduce inductance of power and ground planes and impedance controlled signal lines, heat can be moved away from pad, beneficial to heat dissipation.


• Increase of manufacturing yields


Owing to progress of solder reliability, BGA can maintain relatively large space between connections and high-quality soldering.


• Package thickness reduction


We specialize in handling fine pitch components assembly and up to now we can deal with BGAs whose minimum pitch can be as small as 0.35mm.


When you place a full turn-key PCB assembly order concerning BGA package, our engineers will, first of all, check your PCB files and BGA datasheet in order to summarize a thermal profile in which elements have to be taken into consideration such as BGA size, ball material etc. Prior to this step, we will check your PCB design for BGA and provide a FREE DFM check to be aware of elements essential to PCB assembly including substrate material, surface finish, soldermask clearance, etc.


Due to attributes of BGA package, Automated Optical Inspection (AOI) fails to meet the inspection needs. We undertake BGA inspection by Automated X-ray Inspection (AXI) equipment capable of inspecting soldering defects at the early stage prior to volume manufacturing.

PBGA

PBGA, short for plastic ball grid array, is one of the most popular packaging forms for medium to high-level I/O devices. Depending on laminate substrate which contains extra copper layers inside, PBGA is beneficial to heat dissipation and can cater to larger body sizes and number of balls in order to meet a wider range of requirements.


PBGA exhibits the following advantages:

• Requiring low inductance

• Making surface mount easier

• Relatively low cost

• Maintaining relatively high reliability

• Reducing coplanar issues

• Obtaining relatively high-level thermal and electrical performance

Flip chip

As a method of electrical connection, flip chip connects die and package substrate by directly facing down IC in order to make it attached to substrate, circuit board or carrier. Merits of flip chip include:

• Reducing signal inductance and power/ground inductanc

• Decreasing the number of package pins and size of die

• Increasing signal density

CSP and WLCSP

Up to now, CSP is the latest form of package, short for chip scale package. As the description its name indicates, CSP refers to a package whose size is similar to that of a chip with defects concerning bare chips eliminated. CSP provides a packaging solution that is denser and easier, cheaper and faster. And the following features of CSP helps lead to increasing of assembly yields and lower manufacturing cost.


CSP is so popular and efficient in this industry that up to now there are over 50 types of CSPs in its family and the number is still growing every day. A lot of attributes and features of CSP are contributive to its wide popularity in this field:


• Reduction of package size


CSP can obtain a packaging efficiency as high as 83% or more, tremendously increasing density of products.


• Self alignment


CSP is capable of being self aligned in the process of PCB assembly reflow so that it makes SMT easier.


• Lack of bent leads


Without participation of bent leads, coplanar issues can be greatly reduced.


WLCSP, short for wafer level chip scale package, is a real type of CSP since its finished package exhibits a chip-scale size. WLCSP refers to IC packaging technology at the wafer level. A device with WLCSP is actually a die on which an array of bumps or solder balls is arranged at an I/O pitch, meeting the requirements of traditional circuit board assembly processes.


Advantages of WLCSP primarily include:

• Inductance from die to PCB is the smallest;

• Package size is greatly reduced with density degree improved;

• Thermal conduction performance is tremendously enhanced.


Up to now, we are capable of dealing with WLCSP whose both minimum Within-Die pitch and Across-Die pitch can reach 0.35mm.


0201 and 01005

As electronic market and products advance, growing trend of miniaturization of cell phones, laptops etc. is constantly driving for components with smaller sizes. In order to coordinate with this trend, we've been making efforts to increase component assembly capabilities up to 0201 and 01005.


Up to now, both 0201 and 01005 are extremely popular in electronic market due to the following advantages:

• Tiny size making them quite welcome in space-constrained end products;

• Excellent performance in functionality enhancement of electronic products;

• Compatible with high density needs of modern electronic products;

• Very high-speed applications.


In order to achieve assembly capabilities of 01005, we've succeeded in dealing with aspects concerning its assembly process including PCB design, components, solder paste, pick and placement, reflow, stencil and inspection. Our 20+ years' experience helps us summarize that in terms of post-reflow issues, compared with components with other types of packages, components packaged with 01005 perform better in issue elimination such as bridging, tombstone, edge-standing, upside-down, missing part etc.

We are capable of handling different types of packages in PCB assembly process and the passage above fails to display all. If your required component package form isn't mentioned above, please do not hesitate to reach us at wonderful@wonderfulpcb.com for our expanded package handling capabilities.

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