IC Package Types and Definitions

IC (Integrated Circuit) means an assemblage of electronic components such as resistors, transistors, capacitors, etc. All these are crammed into a very small chip and attached with each other to acquire a common objective.

The IC package is what encases the die of integrated circuit and extends it out into a device we can more conveniently attach to. Every external connection on the die is linked via a very small piece of gold wire to a pad or pin on the packaging. The silver, extruding terminals on an IC are the pins. These pins carry out the work to link to different components of a circuit. These are of highest significance to us whereas they are what will go on to connect to the remaining elements and wires in a circuit.

Every IC is polarized and each is pin is distinctive in case of both position and operation. For this reason, it is necessary for the package to have some way to impart which pin is which. For most ICs, a dot or a notch (in some cases, both or sometimes anyone of them) designates the first pin. If you can recognize the first pin, the rest of the pin numbers increase according to the sequence as you move counter-clockwise around the chip.

The way how the IC packages mount to a circuit board is one of the primary distinguishable package type characteristics. Mainly there are two mounting types: through-hole (PTH) or surface-mount (SMD or SMT). All packages fall into one of these two mounting types. Usually through-hole packages are bigger in size and much simpler to work with. They are designed especially to be pierced through one side of a board and dredged to the other side.

Surface-mount packages can be small to minuscule in size. They are all intended to be installed on one side of a circuit board and be dredged to the surface. Most of the times, the pins of a SMD package thrust out the side. These also steep to the chip, or are sometimes set out in a matrix on the bottom of the chip. ICs with surface mount packages are not very suitable to assemble with hands. Generally special tools are needed to assist in the process.

There are numerous varieties of IC packages, each of which has distinctive measures, mounting styles, and/or pin-enumerations. These packages are batched into three major categories: Dual In-line Packages, Grid Arrays and Chip Carriers. Each package, regardless of the category has a body style that scales with pin count. The number of pins determines the physical dimension of the package, the name of the package does not.

1. Dual In-line Packages [DIP], or Dual In-Line [DIL] packages are packages with two rows of leads on two sides of the package. DIP ICs may be through-hole [PDIP or CERDIP] or SMT package [SOJ or SOIC].

2. Quad Flat Packs or Chip Carriers are square packages [or nearly square], with leads on all four sides Chip Carriers, as in PLCCs and other variants are strictly Surface Mount Technology (SMT).

3. Grid Arrays are those type packages that have their pins arranged in a grid. The pin grid may consist of Leads, pads, or solder balls on an area array. The through hole variant is called a PGA, while the SMT variant might be called LGA or BGA.

Ingredients and Procedures For IC Package Assemblies

In the electronics hierarchy, integrated circuits (IC) can either be considered as the base or the apex and both of these positions are conceivably correct. Being the initial point, primary building block and foundation for majority of modern electronic systems, the IC also stands for the crest in terms of electronic device (i.e. transistor) density. As such, integrated circuits are not radical or monolithic electronic form. According to fulfill the different packaging needs and requirements, there are diverse types of ICs such as: digital, analog, sensor, RF, etc. In this article, we will try to give you a concept about technologies associated to IC packaging, pursuing, the components and methods used to generate these absolutely necessary structures.

Although physical formations, applications and input-output calculations of ICs can be different vastly, the roles and operations of IC packages are lesser in number and more unchanging in purpose. While the IC package has two basic and elementary functions, it has few other roles to play as “keeper of the chip.” The main two functions are: 1) the IC package safeguards the inner die & chip’s circuitry from tangible impairment and from any kind of defilement like moisture and dust and 2) the IC package also helps with redistributing the Input & output of the chips circuitry to a user-friendly component size for use by its end user. Other than these two major roles, a number of potential secondary roles, such as allowing a structure more appropriate for standardization, allowing a fervent heat course away from the chip, providing protection from the probability of errors because of alpha particles and other various radiations, and providing a structure that more handily allows electrical experiment and burn-in by the chip's maker.

The IC package may also be effective to connect more than one IC both directly to one another utilizing standard interconnection technologies like wire bonding, and indirectly utilizing interconnection pathways available on the package such as those used in hybrid IC packages and multi-chip modules (MCMs) and currently in system-in-package (SiP) and other methods covered under the broader concept of volumetric system miniaturization and interconnection (VSMI). The packages also make it simpler to install the ICs in different types of equipment, as every package comprises leads which may be either plugged into corresponding sockets or plugged into mounting frames. Various types of materials are used to manufacture IC packages.

With the escalated interest and expansion of micro-electromechanical systems (MEMS) devices and lab-on-chip devices, the package provides more capacity, such as localized access to the environment, a necessity for pressure variation, or as needed for chemical or atmospheric condition resolution. There is also increasing interest and activity in the advancement of optoelectronic packages to address the requirements of this growingly significant area of activity. There has been a notable ground shift in modern times related to the significance and spreading role of IC packaging, to the point that the IC package has gained a measure of balance in terms of importance with the IC itself. Because the performance of the IC is gated by the IC package in many cases.

Different IC Packages and Details of Dual In-line Package

Like transistors and computer chips, integratedcircuits (ICs) are encased (hermetically sealed) by packages to keep safe the inner chip’s circuitry from tangible impairment and from any kind of defilement like moisture and dust.

For allowing convenient handling and assembly onto printed circuit boards and for keeping safe the devices from any possible damage, integrated circuits are implanted to protective packages. There are a huge number of various types of packages are available. Some of these types have ascertained measurements and endurance which are registered with trade industry associations like Pro Electron and JEDEC. Just one or two manufacturers might make the other types which are proprietary designations. Prior to testing and shipping devices to the customers, integrated circuit packaging is the final assembly method.

Other than these, the IC package also aids with redistributing the Input & output of the chips circuitry to a user-friendly component size for use by its end user, along with allowing a structure more congenial to standardization, allowing a fervent heat course away from the chip, providing safeguard from the likelihood of errors because of alpha particles and other various radiations, and providing a composition that more conveniently allows electrical experiment and burn-in by the chip's maker.

The IC package may also be effective to connect more than one IC both directly to one another utilizing standard interconnection technologies like wire bonding, and indirectly utilizing interconnection pathways available on the package such as those used in hybrid IC packages and multi-chip modules (MCMs).

The packages also make it simpler to install the ICs in different types of equipment, as every package comprises leads which may be either plugged into corresponding sockets or plugged into mounting frames. Various types of materials are used to manufacture IC packages.

Dual in-line package (known as DIP or DIL) is one of the most common among many kinds of IC packages with distinguishable measures, mounting styles, and/or pin-enumerations. In terms of microelectronics, a package of electronic components which has two parallel lines of electrical connecting pins and cased in a rectangular housing is known as dual in-line package. It can be either inserted in a socket or through-hole ascended to a printed circuit board. In 1964, Don Forbes, Bryant Rogers and Rex Rice invented the dual-inline ordination at Fairchild Research & Development. It was during that period, when the limited number of leads obtainable on circular transistor-style packages became a restriction in the application of integrated circuits. Additional signal and power supply leads are needed by the more and more complex circuits (according to the Rent’s rule); in the end, microprocessors and analogous complicated devices needed leads to a greater extent than could be put on a DIP package, which leads to the development of highly dense packages. Moreover, rectangular & square packages made it effortless to route printed-circuit traces underneath the packages.

A DIP is generally mentioned as a DIPn, where n is the aggregate number of pins. We can say for example, a DIP14 microcircuit package would consist of two rows of seven vertical leads. Most common DIP packages have four (lowest) to 64 (at most). Numerous digital and analog IC types are attainable in DIP package forms.

Smallest Ever On-Chip Low-Pass Filter Invented

The world’s smallest on-chip low pass filter is 1,000 times smaller than current off-chip filters. It has been designed effectively by a research team from Nanyang Technological University (NTU) in Singapore.

The circuit that allows low-frequency signals to take across along with lowering unnecessary high-frequency signals from taking across is called a low-pass filter. In comparison to the current off-chip filters, which are separated and quite big, on-chip filters grab a little space on integrated circuit chips, which may be available in mobile devices such as cell phones, notebook computers, speed guns used to monitor traffic, as well as radars placed in vehicles.

Nanyang Technological University and Economic Development Board launched VIRTUS, a latest Integrated Circuit Design Centre of Excellence. The effectual accomplishment of this experiment project was declared just 10 months ago at the official opening of this new IC design centre of excellence.

Yeo Kiat Seng, head of circuits and systems at NTU's School of Electrical and Electronic Engineering is the main person behind this innovation. It is expected that the advancement in design for this filter will revolutionize wireless communication.

"This new low-pass filter can lead to a significant improvement in signal quality as it removes nearly all unwanted interferences and noise in the environment," said Professor Yeo.

"This results in clearer reception and enhanced clarity for mobile phone users and users of wireless applications such as Bluetooth and other mobile devices. For example, if you are speaking to your friend on your mobile phone in a noisy food centre or in a train, you would still be able to hear him clearly."

"The filter also consumes less power and can be easily incorporated into existing integrated circuit chips at almost no cost. This means that in addition to better signal quality, consumers enjoy lower power consumption without any additional cost," he included.

A new horizon has been uncovered because of the invention of the new filter which leads more research and development of high-performance integrated circuits and wireless communication products. With this filter, integrated circuit chips can come to latest applications for transmitting digital audio/video data (uncompressed) and fast wireless local area networks for instant wireless file transfer.

Home Diagnostic Tests Could Be Enabled By Microfluidic Integrated Circuit

Microfluidic integrated circuits have been originated by the researchers of University of Michigan as a technique to make simple lab-on-a-chip devices that could offer faster, low-cost and more portable medical tests.

These microfluidic circuits control the flowing of fluid through their devices without directions from outside systems. This process is similar to the computer chips where electronic circuits intelligently route the flow of electricity without external controls

A paper on the technology is recently disclosed online in Nature Physics.

A microfluidic device, or lab-on-a-chip, combines more than one laboratory operations onto one chip only centimeters in size. The devices make allowance for the researchers to experiment with very small sample sizes, and also to perform multiple experiments on the same material at the same time. They can be cut out to simulate the human body more nearly than the Petri dish does. They could lead to on-the-spot home tests for illnesses, food contaminants and toxic gases are major among other advances.

"In most microfluidic devices today, there are essentially little fingers or pressure forces that open and close each individual valve to route fluid through the device during experiments. That is, there is an extra layer of control machinery that is required to manipulate the current in the fluidic circuit," said Shu Takayama, the principal investigator on the project. Takayama is an associate professor in the U-M Department of Biomedical Engineering.

That's same to how electronic circuits were manipulated a century before. Then, with the improvement of the integrated circuit, the "thinking" became embedded in the chip itself -- a technical step forward that enabled personal computers, Takayama said.

"We have literally made a microfluidic integrated circuit," said Bobak Mosadegh, a doctoral student in Takayama's lab who is first writer of the paper.

The outer controls that power today's microfluidic devices may be inconvenient. Every valve on a chip (and there could be dozens of them) needs its individual electromechanical push from an off-chip actuator or pump. This has made it hard to shrink microfluidic systems to palm- or fingertip-sized diagnostic devices.

The Takayama lab's innovation is a step in this direction. His research group has devised a strategy to produce the fluidic counterparts of key electrical components including transistors, diodes, resistors and capacitors, and to efficiently network these components to automatically regulate fluid flow within the device.

Because of the use of conventional techniques in the making of these components, they are suitable for all other microfluidic components such as mixers, filters and cell culture chambers.

"We've made a versatile control system," Mosadegh said. "We envision that this technology will become a platform for researchers and companies in the microfluidics field to develop sophisticated self-controlled microfluidic devices that automatically process biofluids such as blood and pharmaceuticals for diagnostics or other applications.

"Just as the integrated circuit brought the digital information processing power of computers to the people, we envision our microfluidic analog will be able to do the same for cellular and biochemical information."

The university is pursuing patent protection for the intellectual property, and is seeking commercialization partners to help bring the technology to market.

Story of Integrated Circuits

Integrated circuits (ICs) are considered as a foundation of present-day electronics. They are the cornerstones of most circuits. These are the omnipresent tiny black “chips” which come into view on just about every circuit board. If you are not some kind of insane, analog electronics wizard, perhaps you will have at least one IC in each electronics project you set up, so it is vital to understand them, inside and out.

A collection of electronic components like capacitors, resistors, transistors- all crammed into a small chip, and linked with each other to attain a common goal is called an IC. These come in various sorts and varieties: single-circuit logic gates, voltage regulators, microcontrollers, op amps, microprocessors, 555 timers, motor controllers, FPGAs… the list does not end.

We can visualize the tiny black chips by thinking about integrated circuits. But what does the black box contain? The actual “substance” to an integrated circuit is a complicated layer of semiconductor wafers, copper, and other materials, which interlinks to create resistors, transistors and various components in a circuit. The trimmed and well-formed amalgamation of these wafers is known as die.

The integrated chip itself is small and because of this the wafers of semiconductor and layers of copper it consists of are extremely thin. The interconnections between the layers are immensely complex. A die of an integrated chip is the circuit in its tiniest allowable form, too tiny to solder or connect to. The die is packaged, which makes our job of connecting to the IC effortless. The IC package turns the delicate, tiny die, into the black chip we’re all familiar with. The small and delicate die is turned into the black chip (which is familiar to all) by the IC package.

The integrated circuit die is encapsulated by the package and this package splays the die out into a device we can more conveniently connect to. Every outward connection on the die is linked via a small piece of gold wire to a pad or pin on the package. Pins are the silver, releasing terminals on an IC, which go on to attach to other parts of a circuit. Pins are what will go on to connect to the rest of the components and wires in a circuit. For this reason, these are most important to us.

There are numerous varieties of packages. Each of them has distinctive dimensions, mounting-types, and/or pin-counts. Majority of them are DIP, QDIP, SQP, PDIP, SOP, QFP, PLCC, SW, SQL, DPAK, SIP, SOS, TSOP, FDIP, TO3, TO2205, SOT23, SOT223, PENTAWATT and many more.

Each pin of an IC is unique in the cases of both location and function and all ICS are polarized. This means the package has to have some way to convey which pin is which. Maximum ICs use either a dot or a notch to specify which pin is the first pin. (Sometimes both, sometimes one or the other).

Once you know where the first pin is, the remaining pin numbers increase sequentially as you move counter-clockwise around the chip.