Company YAGEO announced its intention to remove marking of RC/AC 0603,0805,1206 SMD chip resistors from July, 1-st, 2013.
Everything implies, that the situation with marking of chip resistors (0603/0805/1206) will soon be similar to chip capacitors – i.e. no marking on the top of the component. The reason for this step is to reduce unnecessary chemical usages for environmental protections.
Naturally, to identify the product resistance value, each single reel will be labeled with all relevant data as so far. Performance, features, specifications and manufacturing process of these resistors remain the same. So, the elimination of the marking on top of the product itself has no impact on the product functionality and reliability. There will be a short period of time that both types of the products, with marking and without marking, co exist while changing the production lines one by one.
Detailed information: Yageo – Remove marking of RC/AC 0603/0805/1206.
Will the SMD resistors marking become a history? - [Link]
If you´re facing a decision which diode to use in your device or searching for a replacement, then this article is dedicated right for you.
Reliable diodes are often one of the fundamental pillars of a proper operation of devices. Many designers choose a suitable type so to say “by an eye” , by experience. So it can easily happen, that there will be used a uselessly overrated diode (occupying more PCB space) or in a worse case – an insufficiently rated diode, which will work in a given device on the border of its possibilities.
Diodes in general feature one good property – they´re relatively easily replaceable by a similar type from another producer. KAs SOS electronic is the authorized distributor of company Diotec, we´re able to offer you a suitable type for virtually any device, or a replacement for almost any diode from other producers. Diotec as a producer specialized mainly on diodes, offers a wide portfolio of diodes with axial leads, in SMT packages, including power types like power sod-123, Power-SMD, D-PAK (TO252AA) and D2PAK (TO263AB), super-fast with low losses but even rectifying bridges and many other types.
Schottky diodes naturally provide lower losses thanks to a lower forward voltage, that´s why their usage is mainly in place in applications with relatively higher currents. In general it´s also valid, that a small SMT package can significantly eliminate the radiation of EMI in switch-mode power supplies (thanks to a minimal parasitic inductance), what can be one of factors, whether a given device will meet EMI regulations or not.
On the internet, it´s possible to find various „cross-reference-lists“, but for a given application, usually only some selected parameters are important. That´s why we better recommend to choose according to concrete parameters. A help at selection will provide you the case cross reference and the list of most commonly used 1A diodes. For a practical usage, it´s good to be familiar with hints for soldering and assembly, minimum solder pads sizes as well as basic facts about basic facts about thermal stresses of diodes.
Also available to download is the example of usage of Diotec diodes in Set Top Boxes and in LED driving. It is worth to mention, that also several fakes of Diotec diodes appeared on the market.
Do you need diodes? – Diotec has them - [Link]
SMD solder paste stencils are used to accurately “print” a thin layer of solder paste onto a PCB on which the components are placed before reflow soldering. The “printing” is done in a method similar to screen printing, where the solder paste is squeegeed through a 4 mil thick, stainless steel stencil onto the PCB.
This is all well and good, but commercial stencils are expensive, and are massive overkill for prototype boards. Here is a method for producing a “good-enough” stencil using aluminium sheet via a method similar to PCB production via the UV photosensitive film method.
Home-made solder paste stencil - [Link]
This project is “NanoUtils Xtal” – a crystal oscillator breakout board. The board is designed to be interfaced with microcontrollers that have their oscillator pins next to a ground pin. [via]
This board is a breakout containing a SMD crystal, two caps and a resistor meant to be used in breadboards when building something with an Atmel ATmega or a Microchip PIC that have the two crystal pins next to a GND pin. For instance the atmega328 or pic18f2550.
Crystal oscillator breakout - [Link]
Our friend Vasilis posted a video story of a successful SMD reflow process… at his home, amazing!
Powered by the Low Budget Manual Pick and Place : http://vpapanik.blogspot.gr/2012/11/low-budget-manual-pick-place.html
SMD reflow at home - [Link]
Action video of the Low Budget Manual Pick and Place Originally posted in : http://vpapanik.blogspot.gr/2012/11/low-budget-manual-pick-place.html
Low Budget Manual Pick and Place (HD) - [Link]
Our friend Vassilis decided to build his own manual Pick & Place machine to facilitate his work with 0402 SMD and other fine pitch parts. He used plywood, a pen microscope and a vacuum pump to build this dirty cheap Pick and Place manual machine:
If you are dealing with tiny SMD parts (e.g. 0402 resistors and capacitors), a manual pick and place machine is a helpful piece of equipment for prototyping and small-batch manufacturing. On the other side, traditional SMD placement using precision tweezers not only requires an ultra-steady hand but also becomes a tiresome drill, especially when working long hours upon fine-pitch PCB footprints.
Low Budget Manual Pick & Place - [Link]
Super Simple SMT: Stencil8 – [via]
Over the years, I’ve soldered a fair number of boards. I’ve also seen how professional factories produce their boards. This is my technique for doing it myself, and I hope it works as well for you as it does for me. Note: the files needed to make the fixture, custom pcb setup, and stencil are on Github – Stencil8. This whole project is OSHW.
Super Simple SMT: Stencil8 - [Link]
My inspiration for developing this gas gauge was after purchasing a new car (Scion Xa) and wondering what MPG I was getting. After much research on ODBII protocols (Scions support CAN-BUS), and looking into open source software that already existed (OBDuino32K) I delved into my first Arduino project.
This project has taken me over a year to put together from building my own CAN-BUS shield, learning to design a circuit board, soldering SMD parts and then building my own enclosure so I could mount it in my car.
Arduino CAN-BUS OBD Gas Gauge - [Link]
Thanks to their very low equivalent serial resistance (ESR), they provide a very worth function in power supply parts of various devices. In many cases, there´s no need to add any other types of filtering capacitors anymore.
SMD ceramic capacitors are nowadays commonly available in relatively very high capacities of units to tens of uF, while keeping small dimensions (0603 – 1210). There are also available higher capacities in bigger packages, but the offer of producers is especially reach at these small packages (0603-1210) and prices are significantly better in comparison to a recent past.
Why to use a ceramic capacitor? First, it has a substantially lower value of ESR than electrolytic capacitors and also lower than tantalum ones. This is reflected in low losses and outstanding filtering properties even at high frequencies and high currents, what is especially beneficial at power supply of fast semiconductors and in switch-mode power supplies. Low power consumption of modern components enables to decrease an overall capacity of capacitors in a power supply part, that´s why in many cases a few uFarads are sufficient. A big advantage is a long lifetime too, because they don´t contain any liquid electrolyte. Naturally, in devices, where high current peaks occur, it would be economically inefficient to use ceramic capacitors only. In such cases a combination of ceramic and tantalum or electrolytic capacitors is ideal.
In our offer can be found more types, also a novelty in our offer – 2,2uF/10V/0805 from the X7R mass from company YAGEO (please note a significantly lower price at purchase of 50 pcs and more). The X7R mass ensures very good properties in a wide range of temperatures and voltages. Detailed information will provide you the X7R, X5R and Y5V documents. In case of interest about any YAGEO component, please contact us at firstname.lastname@example.org
Do you utilize ceramic capacitors for power supply filtering? - [Link]