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27 Aug 2014


If you have an application, where you work with kilovolts and you need a suitable diode, we have a solution for you.

It´s not a quite common thing, to find a diode with a reverse voltage of more than 1000V in your “home-drawer stock”. But you develop a device, requiring a diode with a substantially higher reverse voltage and nothing suitable is by a hand …

The help is simple – use the DD1000 diode or in case of higher currents, choose a suitable type from the portfolio of High-voltage types from Diotec and send us your requirement. DD1000 features VRRM up to 10 000V, but in respect to its small dimensions and a construction, it´s suitable only for currents up to 20mA. This is sufficient for construction of various testers, voltage multipliers and similar. Should you require higher currents, many suitable types are available, which still maintain compact dimensions. For more powerful designs, it´s possible to use for example a cylinder type SI-A („hockey puck“) with a screw connection allowing for simple series connection (eventually also with RC cell).

Direct 10 000V where ever you need - [Link]

25 Aug 2014


Pleasant actuation characteristics and reliable features of a push button switch Marquardt series 1840 make it attractive for all applications where you require control by a push.

Classic push-button switches are favorite for many decades, maybe also because they´re well known already from the beginnings of electronics. Probably, a nostalgia is not the only reason making them popular, but mainly an easy control, when even an unacquainted person knows, that it´s something “what has to be pushed” to change a status of an electric device.

Exactly a term “to change a status” is important, because at these switches it´s not possible (or not easily visible), whether it´s switched on or off. Though it´s true, that the majority of such switches is a little bit pushed down (lowered) in a switched on status, but the difference is often small. That´s why these switches are not suitable for applications, where from safety reasons it´s necessary to know tha status of the switch before connecting to a mains line.

Switch 1841.1301 (SPNC) belongs to a top in this segment and offers a really pleasant control and a quality switching system with a mechanical endurance of min. 100 000 cycles. 6A/ 250V is far sufficient for many applications and assembly is simple – by means of an M12 nut supplied. An interesting supplement is also a neoprene cap integrated with an M12 nut, enabling to gain a considerable resistance to water and dust. Also available are 2-pole versions – 1842 and also versions functioning as a push-button (momentary).

There are 2 nuts supplied. One is “regular” – hexagonal and the other one is a round type intended to be used as a top cover on a front panel. Further detailed information will provide you the Marquardt 1840 datasheet.

Marquardt 1841 – above standard classics - [Link]

25 Aug 2014


by elektor.com:

International Rectifier have announced the introduction of the IR66xx series of high performance 600V ultra-fast Trench-gate Field Stop insulated-gate bipolar transistors (IGBTs). The new high power family of devices features extremely low conduction and switching losses optimized for welding applications.

Utilizing Trench thin wafer technology to offer lowest conduction and switching losses, the new devices are co-packaged with a soft recovery low Qrr diode and feature ultra-fast switching (8 KHz – 30 KHz) with 5 µs short circuit rating. The 600 V IGBTs also feature low VCE(ON) and positive temperature coefficient for easy paralleling.

IR Launch Welding IGBT - [Link]

16 Jun 2014


A practical guide for the selection of power inductors for DC/DC converters from Würth Elektronik. [via]

App note: Power inductors 8-design tips - [Link]

14 Jun 2014


To tell the truth, probably no, but we have for you a few hints for relays which are very close to an ideal.

Signal relay is almost an „ideal component“ thanks to a practically zero distortion and a total isolation of a switched signal from a control one. That is naturally one of the main features of all electromechanical relays, but at signal relays it´s especially valued, as we usually require switching of relatively small signals. Favorite and widely used are for example relays Fujitsu series B3 and B4 (miniature SMT and THT relays) and series AxW (miniature only 5mm high relay) – all with bifurcated gold-plated contacts for a high reliability.

A novelty in our portfolio is the series Fujitsu NA representing something like a “golden middle way “. With dimensions 7,4×14,9×9,7 mm it belongs to narrow miniature relay enabling a high density of components on a PCB. Even though relay NA is somewhat bigger than for example series B4, but it´s able to withstand higher AC current – up to 0.5A/125VAC (vs. 0.3A at series B4) and it also provides an extreme mechanical lifetime up to 100×106 , what´s approximately twice that of B4 series. Sensitive coils, with a consumption of 0.1-0.3W at majority of types enable a dense mounting without problems with overheating.

From the point of view of the lowest possible consumption are naturally the best latching relays (with a permanent magnet) controlled only by pulses. Usually they´re easy to recognize by a letter „L“ behind the series marking (for example NAL, JSL). In a Fujitsu signal relays overview and the Fujitsu catalogue can be easily found a comparison among particular types as well as detailed information about them. We try to keep the most favorite types always on stock, what´s also reflected in the substantial increasing of stock.

Does a universal signal relay exist? - [Link]

6 Jun 2014


by Steve Taranovich:

I recently spoke to Piyush Sevalia, Executive Vice President, Marketing at SiTime Corporation,about their newly introduced 32 kHz TCXO (temperature compensated oscillator) which they claim to be the smallest, lowest power device in the industry. With its tiny footprint and ultra-low power consumption, the SiT1552 MEMS TCXO decreases the size and increases battery life of wearable electronics and Internet of Things (IoT); such benefits are not achievable from legacy quartz devices.

SiTime enters wearables, IoT markets with 32 kHz MEMS TCXO - [Link]

6 Jun 2014


IQD frequency products have introduced a new range of temperature compensated voltage controlled crystal oscillators (TCVCXO) in a miniature 8-pad 5 x 3.2 mm outline. The IQXT-210 series TCVCXO, offers frequency stability down to ±0.14ppm over the full industrial temperature range of -40 to 85ºC.

Powered from a 3.3V supply the IQXT-210 has a typical current draw of only 12 mA (dependent upon oscillator frequency). The frequency can be specified between 10 MHz to 50 MHz. Initially there are 11 standard frequencies available including 12.8 MHz, 19.2 MHz and 26.0 MHz. Output can be specified as either HCMOS, 15pF load or Clipped Sine, into 10k Ohms load.

Tiny TCVCXO gets close to oven–controlled crystal stability - [Link]

22 May 2014


By Panasonic

Capacitors may seem simple enough, but specifying them has actually grown more complex in recent years. The reason why comes down to freedom of choice. The universe of capacitors has expanded greatly over the past few years, in large part because of capacitor designs that take advantage of advances in conductive polymers.

These advanced capacitors sometimes use conductive polymers to form the entire electrolyte; or the conductive polymers can be used in conjunction with a liquid electrolyte in a design known as a hybrid capacitor. Either way, these polymer-based capacitors offer a performance edge over conventional electrolytic and ceramic capacitors. [...]

The various polymer and hybrid capacitors have distinct sweet spots in terms of their ideal voltages, frequency characteristics, environmental conditions, and other application requirements. In this article, we will show you how to identify the best uses for each type of advanced capacitor. We will also highlight specific applications in which a polymer or hybrid capacitor will outperform traditional electrolytic or ceramic capacitors.

Understanding Polymer and Hybrid Capacitors - [Link]

15 Mar 2014


If you have in your “drawer” a universal 1000V diode in a miniature SOD123FL package, you have a solution for many circuits. 

Small/ bigger, with a lower- or rather with a higher cut-off voltage, solderable by wave or by reflow … these are for example some of the criteria when selecting a universal rectifying diode. However if you already know, that 1A current and a middle speed are sufficient for you, then we can say, that only one type will be sufficient for you in majority of cases – SL1M from company Diotec.

Standard silicon diodes show only a minimal dependency of VF from a cut-off voltage – in opposite to Schottky diodes, where a choice according a cut-off voltage is important in order to reach low losses (as a forward voltage – VF is noticeably higher at types with a higher cut-off voltage).

In other words, if a Schottky diode transfers for example 1A current, there´s a significant difference in a VF between types with a lower cut-off voltage in comparison to types with a higher cut-off voltage. However common silicon diodes don´t have this dependency, thus in general it dosen´t matter, whether we´ll use a „100V“ diode or a „1000V“ diode on a given place (if we don´t use a possible breakdown intentionally). So if can choose between a 400V and 1000V type for a similar price, nothing prevents us to better buy a 1000V type and to have a surety of universal usage – for example even for a direct rectification of a mains voltage. As a result we´ll gain for example a higher resistance to various overvoltages.

SL1M offers such versatility thanks to a very good price and also thanks to its dimensions, because it belongs to the smallest 1A diodes in the market. The only requirement if we want to use a maximum current of 1A is, that it´s necessary to observe a minimal pad dimensions (copper area) of approx. 5x5mm at both sides. This won´t be a problem for the most of applications, as to this area also contribute surrounding solder pads of other components (if they don´t generate heat). Naturally, in this case we mustn´t use at the PCB design a thermal isolation of pads (so called thermals), but only a non-solderable layer (solder resist).

Detailed description contains the Diotec SL1 datasheet and many useful documents can be found in our recent article “Do you need diodes? – Diotec has them“.

SL1M – when one diode can replace several types - [Link]

28 Jan 2014


If you don´t have enough space on a PCB, maybe you´ll benefit from dual connectors for SIM cards and memory cards.

Usually there are more than enough reasons why to save space. Especially at handheld devices it´s almost always desirable that they were miniature and lightweight. We bring you two useful SMT connectors able to solve a problem with insufficient PCB space:

  • microSD+SIM card socket – 112G-TA00-R, 2×8 pinov, push-push for uSD/ push-pull for SIM, SIM/SD cards are mutually rotated in 90°
  • 2x SIM card socket – 115H-BA00, push-pull

Both sockets are made of a stainless steel and the plastic part is from an LCP (liquid crystal polymer) class UL94-V0 (self-extinguishing). Compact construction of both connectors is also reflected in a low profile of 2.7/ 3 mm.

“Doubledecker” can be found not only in London - [Link]





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