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Diotec keeps its product portfolio close to the market demands with know-how, research and passion.


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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Our New Databooks Are Available Now!

new databooks

Find out more detailed information of our diodes, rectifiers, transistors and regulators on many data sheets on 1 155 pages.

You can order your databook free of charge with reference to article no. 3214 and by sending an email to orderconfirmation@diotec.com.

NEW: Application Note - Understanding Thermal Specifications of Bridge Rectifiers

App Note Thermal Specifications of Bridge Rectifiers

This new Application Note explains the mechanisms of heat transfer in semiconductor components along with Diotec’s datasheet parameters of 1ph and 3ph Bridge Rectifiers.

Moreover, it describes a way to determine whether a bridge is suitable for a given output current and ambient respectively case temperature.


NEW: Application Note - ESD Protection Diodes for High-speed Signal Interfaces

App Note about ESD Protection Diodes for High-speed Signal Interfaces

This Application Note is about choosing suitable diodes for high-speed signal interfaces. One of the major industry trends towards smaller chip size and higher data rate decreases chip tolerance to any voltage transient surge events.

Therefore, electrostatic discharge (ESD) protection diodes play a bigger role than before.

Temperature Monitoring - An Overview of Three Cost-optimized Solutions

Temperature Monitoring

Ambient and component temperature have a decisive impact on the performance and lifetime of electronic equipment.

This Application Note introduces three accurate and cost-effective solutions for a wide range of temperature sensing applications.

Shunt Regulator and Voltage Reference with Reduced Regulation Current


The MMTL431B extends our family of Shunt Regulators and Precision Voltage References. It offers a reduced minimum regulation current I_K(min) of typically 30 µA, and maximum 300 µA. This makes it ideally suited for secondary side control of flyback converters, used in offline power supplies and battery chargers, but also replacement of low voltage Zener diodes (< 10 V). Especially in latter case it is often desired to have a temperature compensated, stabilized voltage at low current consumption. With just few external components, the MMTL431B allows for exactly such function.


Parts in Glass Package Become Totally Lead-Free

lead-free parts

Though the RoHS directive still allows usage of lead (Pb) under exemption 7(c)-I, our devices in glass package will be switched from January 2022 onwards to totally lead-free versions. Through this we address the increasing number of customer requests for such "green" devices. Package outlines include SOD-106 (MicroMelf), SOD-80C (Glass-MiniMelf), DO-213AB (Glass-Melf) and DO-35 (Axial lead). Since there is no change in form, fit nor function, a PCN is not required. Our family of totally lead-free parts further includes these plastic case outlines: 0603, 1608, SOD-882, SOT-883, SOD-523, SOD-323(F), SOD-123(F), SOT-323, SOT-363, SOT-23.

NEW: Diotec Selection Guides for Diodes & Rectifiers and Transistors & Regulators

selection guides

Our Selection Guide has been completely reworked and is now divided into two separate editions: One for Diodes & Rectifiers and the second for Transistors & Regulators.

They provide a quick overview about our entire product range and are thus a useful tool for selecting components according to their main parameters and to look for potential alternatives. For the first time, we use 3D images for the package outlines, which allow a fast recognition of the parts. The main sizes and also case outline standards are anyway provided. Standardized symbols help to easily differentiate between e. g. uni- and bidirectional TVS diodes or to recognize the configuration of dual and multiple devices. You can either download the single pages from our website or order the two printed versions here orderconfirmation@diotec.com.