Don´t let yourself get confused by miniature dimensions – small SMT LEDs produce surprisingly strong light.
SMT LEDs enjoy a big popularity because of their size but also thanks to a fast and simple assembly to PCB on automatic machines. In comparison to wire-leaded types, a vast majority of SMT LEDs doesn´t contain optics, thus radiating in a wide beam angle. That´s why is their light visible even from wide viewing angles and at the same time it enables to easily reach a uniform backlight of panels, displays, …
From the smallest SMT LEDs you can find in our store sizes „0603“ (KP-1608) and „0805“ (KP2012) from company Kingbright. Particularly in the Kingbright. Particularly in the KP-2012 series can be found several types with a luminous intensity in the order of hundreds mCd. A novelty in the Kingbright portfolio are series SR-J4 (640 nm – red) and series ZGK (525 nm – green) comprising LEDs of various dimensions. For example the new type KP-2012SRC-J4 (640 nm) has a luminous intensity of up to 600 mCd (@20mA).
In general, all KP series LEDs are low-profile (thin), but at extreme space requirements, the solution exists in an ultra-thin version KPT (only 0.75 mm height – KPT2012).
Naturally, it´s not always necessary to have a high light output (for example at indoor usage), that´s why at several types can be found a version with a higher and also with a lower luminous intensity, what is usually also reflected in a price of a given type. In stock we keep the most requested types suitable for majority of applications. Should you have interest in types which we don´t keep in stock, please don´t hesitate to contact us at email@example.com.
Small but powerful LED series KP- 2012 – [Link]
alexglow @ instructables.com writes:
Note: By “beginner’s guide”, I mean a guide written by a beginner. (I made it at TechShop SF, during my first weeks!) I have some technique tips to share, but for more in-depth questions, Google is your friend.
Solder paste allows you to populate a board with many tiny components, without straining your eyes and fingers. Using minuscule components saves space, and you can dramatically cut down the space between them when you don’t have to solder every connection by hand.
Beginner’s Guide to Solder Paste - [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]
GSM, DCS, PCS, UMTS, 434/868 MHz, GPS, TETRA and many other signals are no problem for small ceramic antennas from company 2J.
Among products from company 2J, which can be found in our stable stock offer, we recently incorporated miniature ceramic SMT antennas enabling to create miniature closed devices without any external antennas, connectors, cables, …
● 2JE03 – 5-band SMT antenna for GSM850, GSM900, DCS, PCS and UMTS (1710-2170 MHz) bands. With dimensions of only 24×5.5×4.4mm, it represents a miniature solution for a wide spectrum of applications.
● 2JE05 – extremely small (9x3x1,2mm) SMT antenna intended for free bands 434 MHz, 868 MHz and 915 MHz. The antenna can be easily matched for a given frequency band by means of a few passive LC components (matching circuit). 2JE05 features a relatively very good standing waves ratio (VSWR) max 2.0:1 in the whole range.
Detailed specification of these antennas can be found in the 2JE03 and 2JE05 datasheets. A comprendious overview will provide you the 2J catalogue as well as catalogue of internal (embedded) antennas. Upon order, we´re able to provide you any antenna from the 2J portfolio. In case of interest, please contact us at firstname.lastname@example.org.
Miniature SMT antennas 2J are able to cover several bands - [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]
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]
Literally endless long bands of a linear light can be produced with LEDs of the Duris E3 and E5 series. A wide-angle beam and a very uniform light distribution make these LEDs very easily applicable.
This is exactly the case of Duris E3 and Duris E5 LEDs. Thanks to their compact SMT packages, they can be freely used on PCBs of virtually any shapes. Small dimensions of both LEDs enable tight placing of LEDs next to each other. OSRAM Duris E3 and Duris E5 LEDs feature a very homogenous radiation pattern in a wide angle (120°) and a high efficiency of up to 110lm/W. The result is a perfectly homogenous light without visible dots. That´s why they´re perfectly suitable for a construction of replacements of classic fluorescent lamps (CCFL) (T5 a T8) and bulbs. Duris E3 and E5 have very similar optical specification, the main difference is in the maximum current of 30mA/E3 versus 180mA/E5.
It is good to realize, that a maximum current of LED has nothing in common with efficiency, i.e. even low-power LEDs feature a high efficiency (lm/W). That´s why approximately the same-efficient light source can be created by 1 OSRAM OSLON Square LED, but even by for example 50 pcs Duris E3 or 8 pcs Duris E5. An advantage of high-power LEDs is an easy achievement of a high luminous flux from a small area (spot lights) and an easy application of optics. On the other hand, less powerful LEDs are usually more easily applicable, no secondary optics is necessary and often even no additional heatsink is necessary because the power is dispersed on a bigger area and already the PCB itself is often able to lead away and dissipate a generated heat. That´s why the usage of Duris E3 and E5 is very simple and virtually immediately after soldering LED to a PCB we gain a working source of a homogenous light. .
A light without an end with OSRAM Duris E3 and E5 LEDs - [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]
BF245, a JFET transistor produced for many decades by several companies, has joined the list of discontinued components. However an equivalent replacement exists in an SMT package and its name is BF545.
BF245 in a TO-92 package has been one of the first transistors, which were mass-used. That’s why it’s no wonder, that the BF 245 is nowadays familiar to every experienced technician. As a transistor with a very high input resistance (tens of MOhm) and a relativlely low noise, it’s gained a global popularity and served to many beginning technicians at an assembly of their first radio-receivers. There are many other FET transistors on the market nowadays, thus the usage of BF245 is substantially smaller. Moreover, a majority of electronics is produced with SMT components, what probably was one of more reasons why all main producers have discontinued the BF245.
However, BF245 is still an interesting transistor, that’s why it will be henceforward available in a SOT23 SMT package as the BF545. It is available in 3 groups A, B, C – sorted according to IDSS at VGS=0. Directly from our stock are available BF545A, BF545B and BF545C from company NXP (originally Philips). Detailed information can be found in the BF545 datasheet, as well as in the RF Manual document.
BF245 – the legend is leaving, the successor comes - [Link]