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Diodes à la Carte: The BAV99 in Different Varieties


The BAV99 is a widely used small signal device in dual diode configuration. Its two diodes in series can be used for any kind of signal processing, and two parts can even form a bridge for high speed full wave rectifying. As different as the applications are the requirements on such device: High volume consumer devices require only low voltage levels, but especially low BOM costs. Industrial applications need higher power and voltage ratings, e. g. at 24 V industrial control units. Battery powered electronics must be operated with lowest possible leakage currents to allow for long stand-by times. In addition, parts might need full AEC-Q101 qualification, in case of automotive use. 

Like choosing your favourite meal from a menu card, Diotec offers the BAV99 series from now on in different varieties, perfectly matching your particular needs:

* The BAV99-C in commercial grade, rather cost attractive and offering 70 V / 2.5 µA / 225 mW
* The industrial grade BAV99, having 85 V / 1 µA / 350 mW
* The AEC-Q101 qualified BAV99-AQ, again with 85 V / 1 µA / 350 mW
* The "high end" voltage version BAV99L, with 100 V / 1 µA / 350 mW
* The "low leakage" varieties BAV199 and BAV199-AQ, offering 85 V / 5 nA / 350 mW

Any wishes still open? This is just the beginning of further product series offering different parameters but also gradings, from commercial via industrial to AEC-Q101 qualified. We will keep you informed!


Happy Cows Served by Feeding Robots

happy cows and feeding systems

Modern freestall barns allow cows to move around almost freely. Only when it comes to feeding, they move to their dedicated eating slot. Now the farmer must be fast, since the cattle wait impatiently. Feeding robots can take off the farmer from this boring but important job, required several times a day. It allows him to spend more time on other, more interesting items. When the robot has finished the job, it returns to the charging station where it gets recharged for the next feeding mission.

Diotec's SK36SMA, respectively SK36SMA-3G are 60V Schottky rectifiers in SMA offering a forward voltage drop of < 0.7V or even 0.55V (-3G) at 3A and are used in battery charging stations for feeding robots and others. These devices ensure a fast and reliable charging, and keep - in this particular case - the cows happy!

More Application Security for Our Customers by Comprehensive Data Sheet Disclaimer

disclaimer data sheets

We have added a comprehensive disclaimer to each of our data sheets, like almost every manufacturer is nowadays doing.

It clearly mentions the types of applications where special care and clarification is required, and provides even more security and support to customers when choosing our parts. Check it out on the example of UGB8JT.

Design Idea Dimmable LED Driver Circuit

The SBCT30150 Schottky Diode for the Fast Charging of Power Tools

Power Tools

Whenever you want to repair something or, for instance, hang up shelves and small cabinets, power tools are useful assistants. Nowadays, most of them are battery-powered.

Dual Schottky diodes with common cathode are typically used as output rectifiers in forward converters, the usual circuit of fast battery chargers. Diotec’s SBCT30150 offering an I_FAV of 2 x 15 A and a V_RRM of 150 V is ideally suited for the established 18 V systems. This dual Schottky comes in the TO-220AB case outline and provides a low thermal resistance for good heat dissipation.

Plasma EPOS Technology - "Green" Production of Power Semiconductors

Plasma EPOS Technology

In 1996, Diotec introduced its “Plasma EPOS Technology” that allows the omission of 1 200 m³ of chemicals in the last 25 years - equivalent to the filling level of a short-distance pool at the Olympics.
EPOS is the acronym for Etched and Protected On Slice. Instead of using toxic chemicals, the etching and first passivation are done using plasma under near-vacuum conditions.

This eco-friendly process is used in Diotec’s German and Slovenian Chipfab.
Plasma EPOS chips are assembled in all Melf and MiniMelf types, all Low Vf diodes, several Zener and TVS devices and some bridge rectifiers. Our Selection Guides provide an overview of our main products.

NEW: Application Note about Smart Meters

App Note about Smart Meters

Smart Meters are getting the standard in electricity metering and replace the formerly used electro-mechanical solutions. „Smart“ has several meanings and starts with elect-ronic/micro-controller based metering, goes via comfortable user interface and display solutions and does still not end at various ways of connectivity. They are prepared for future ways of „smart“ billing, offering e. g. low costs for electric energy in times where wind and solar power is highly available.

The main function blocks for these devices are the power supply unit, the micro-controller board (MCU) and the communication and display boards. This application note focuses on the power supply unit, where Diotec offers several semiconductor solutions dedicated for Smart Meter needs. Take the example of input rectifier stage; it is connected directly to the landline and thus highly affected by excessive voltage peaks caused by lightning strikes. No matter if you prefer single diodes connected in series, avalanche rated rectifiers or Diotec‘s brand new 3000 V diodes: we offer you any solution according to your requirements.

Ultrafast Rectifier US1M - Why It Makes Sense to Use a 1000 V Component on a 24 V Smart Building Field Bus System


Few years ago, the KNX standard for smart building applications was recognized as international standard ISO/IEC 14543-3. It defines information exchange protocols working either via the traditional power line, ethernet, radio frequency or a 24 V field bus system. The latter requires non-isolated, low power DC/DC converters for every device connected to that bus system. It converts the DC bus voltage ranging between 21 V and 30 V to typically 5 V or lower used by the electronics. Since space in typical installation sockets is restricted, DC/DC converters with high switching frequencies are used, in order to minimize magnetic elements like coils and transformers.

Here the US1M having 1 A, 75 ns and 1 000 V comes into play. As a rule of thumb, the free-wheeling diode in switching converters should have minimum a seven times higher V_RRM than maximum DC voltage, so here 7 x 30 V = 210 V. By this, voltage peaks created by high frequency switching will not harm the diode. So a Schottky is out, since maximum available V_RRM is about 200 V only. A 400 V ultrafast rectifier would be the first idea to be used. But smart building systems need to run reliable over many years. Switches and displays, touched by us human beings, are affected by electro static discharges of several 1000 volts. Though not all of that will reach the electronics of the field bus device, it makes sense to spend some extra safety margin on components used. The 1 000 V of the US1M provides sufficient protection for reliable and long lasting smart building functionality.

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Application Note Smart Meter