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27 May 2012

Giorgos Lazaridis writes:

I have began working with SMD chips and especially with my favorite QFN package some time ago, and i have already manage to radically reduce the size of my PCB to minimum, thanks to the tiny footprint of those packages. Slowly i began replacing my titanic through-hole parts with SMDs (whenever possible). One problem that arises with QFN PIC packages is that the microcontroller must be programmed after being soldered to the PCB. I know that there are QFN sockets that i can use to make a QFN chip programmer, but they are still very expensive to get, almost $100 each.

I turned using 0.1 pitch headers on each PCB, but this was totally inefficient, because this connector occupies more PCB space than the PIC itself. Taking also into account that the programming connector will only be used once, i decided to design something better, smaller and somehow faster for programming the PICs.

PIC ICSP Instant SMD Connector with Pogo Pins - [Link]

2 Apr 2012

The SMD Codebook is a comprehensive internet database of the two and three letter codes used to mark small surface mount parts. This is an indispensable resource for repairing and reverse engineering SMD circuits. [via]

SMD devices are, by their very nature, too small to carry conventional semiconductor type numbers. Instead, a somewhat arbitrary coding system has grown up, where the device package carries a simple two- or three-character ID code. Identifying the manufacturers’ type number of an SMD device from the package code can be a difficult task, involving combing through many different databooks. This HTML book is designed to provide an easy means of device identification. It lists over 3,500 device codes in alphabetical order, together with type numbers, device characteristics or equivalents and pinout information. Sometimes I’m asked to put IC information in the codebook. There is some information about ICs – but first and foremost the codebook is intended for discrete devices. Some ICs have been included, usually these are 3/4 pin devices or RF circuits I’m interested in.

Identify surface mount part codes online - [Link]

24 Feb 2012

SMD Packages explained!. The Funkiester writes – [via]

Hello! Well as a result of all the great feedback from the component packages, I’m doing another post about SMD packages! I may be using some of the terminology from the last post in here as well, so just in case, here is the last post.

First off, SMD means Surface Mount Device; There is another acronym used that means pretty much the same thing which is SMT, and that means Surface Mount Technology. This’ll be describing the various packages that an LED can come in, as well as resistor and the more common capacitor packages as well as many other surface mount devices. The big rule about SMD is that many packages are represented by a 4 digit code. The first two digits indicate its length and the second two digits indicate its width. So an 0603 package would be .06″ x .03″ . Although if it isn’t represented by a 4 digit code, that doesn’t mean that it isn’t an SMD component, all that means is that you’ll have to do a little more searching to find the dimensions of your specific component.

The most common packages are the: 0603 , 0805 , 1206, 2512, and the SOT. although we will be discussing the 0606, 1204, 1210, SOD, PLCC, Chimney-Type, 3528, 5050, A, C, D, E. The space on the board where the SMD will sit is called the footprint, and the footprint is like a little diagram as to where the component is to be soldered on the board and how much space it takes up.

SMD Packages explained! - [Link]

4 Feb 2012

coremelt.net writes:

Since this is a well working low budget AVR ISP progammer (by Thomas Fischl), I offer a compact single-sided THT-SMD combined layout. The circuit is identical to the official programmer, so the original firmware can be used with this board. This programmer is supported by avrdude. One of the main features is that the low speed USB protocol stack is realized directly with the used AVR controller, which makes this programmer a low budget one, about 5EUR material costs. Notice however that this programmer cannot be used with 3V3 systems without an additional level shifter.

Alternative board for USBasp AVR ISP programmer - [Link]

3 Feb 2012

EEVblog made a SMD hand soldering tutorial. In the video Dave explains how to solder small SMD capacitors and resistors, all the standard size pitches for ICs up to a 0.5mm pitch, as well as some tips how to use large thermal pads, like adding thermal paste or preheating the board and the IC. [via]

Surface mount soldering tutorial - [Link]

28 Jan 2012

An SMD LED for direct drive with 120/230 V alternating current. The LED consists of two separate coils which are connected in parallel at 120 VAC, and in series for drive with 230 VAC. Available in cold white and warm white versions with a light flux of 360 lm and 280 lm respectively.

230V AC Powered LED - [Link]

29 Nov 2011

Electrolytic capacitors in an SMT package are not as often used as leaded radial or axial capacitors are. However they offer many advantages, which make the assembly easier and save a PCB space.

Electrolytic capacitors in an SMT package offer the same properties as their leaded familes (THT version), but they are much easier to assemble on a PCB. If you have a device, where most of components are in an SMT version, you probably proceed the way that SMT components are machine-assembled to PCB with a following reflow soldering. Leaded THT components (through hole technology) are then soldered in the 2-nd technological step – by a solder wave or manually. In a device containing many various THT components this 2-nd technological step is inavoidable. But in devices where only few THT components are, it is often possible to minimize their count or totally eliminate. This makes a production of the device significantly cheaper and quicker. Moreover in comparison to manual soldering, reflow soldering is much more consistent, ensuring a stable quality of soldering in various production batches.

Saving of a space is the second essential advantage. SMT electrolytic capacitors are available even with a very low profile. Thanks to the fact, that pads of SMT capacitors don´t require holes drilling into a PCB, like it is at THT technology, in many applications they can significantly simplify design of multilayer PCBs. Another advantage at HF circuits can be the fact, that integrity of the ground layer on the PCB won´t be corrupted by their usage. Read the rest of this entry »

2 Nov 2011

redFrog Pick and Place machine – example of the pick and place process – [via]

This video demonstrates the process from solder paste application to picking and placing the SMD components to the final flowing of the solder. The picking and placing is done using the new redFrog pick and place machine.

redFrog Pick and Place machine - [Link]

10 Sep 2011

Ruijc writes:

This week’s project is an alarm simulator for car or motocicle and it couldn’t be more simple.

The microcontroller used was the 10F222 from microchip which it’s SMD ( SOT-23 )version only has 6 pins.

Car alarm simulator - [Link]


5 Sep 2011

pcbheaven.com writes:

I plan to make a pre-heater for my SMD works, and i will need a controller for the air heater. From my job i know the PID controllers and how efficient they are, but i did not really know how they work. After some research i did, i sound the “secrets” of the PID systems (and i also wrote a theory for PID systems). So, now i feel ready to turn theory into product. Many will say again that i could spent $40 to get a PID controller… Yes, i know… But i DON’T want to. For me, making projects is not a chore, it is my hobby, i do it for fun.

K-Type Thermocouple PID Controller - [Link]





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