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

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Application Note Reverse Polarity Protection

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-3G Schottky makes it possible:

Low forward voltage for fast charging and low leakage for long stand-by times.

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ESD Protection

You can rely on us. We protect your electronics.

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Cost Effective Yet Powerful Load Dump Protection Diodes: LDP01 and LDP02 in D²PAK offering 5 kW respectively 6.6 kW of peak pulse power


Especially in applications without centralized load dump protection, such as several motorbikes, a powerful yet cost effective load dump protection of distributed board electronics is desirable. The typically used package outline DO-218AB is offering a high performance, but is limited to load dump TVS devices and runs therefore in lower volumes only, causing higher device costs. The D²PAK offers a similar case outline but is an absolute industry standard package, used for high volume devices like Rectifiers and Schottkys. The LDP01 and LDP02 series by Diotec uses TVS chips capable for 5 kW respectively 6.6 kW of peak pulse power; both parts can pass load dump pulses according to ISO-16750-2 2012E – Table 5 Test A. First parts available are the LDP01-26AYD2-AQ, LDP01-28AYD2-AQ and LDP02-28AYD2-AQ, suitable for 12 V systems. Qualification according to AEC-Q101 is in progress and close to be completed. For general information about load dump protection diodes, please refer to our Application Note.


40 A/30 V Power MOSFET On Just 3.3 x 3.3 mm² DI040N03PT-AQ: Low Rds(on) in Tiny QFN3x3 Package with AEC-Q101 Qualification


The DI040N03PT-AQ comes in the tiny QFN3x3, a so called "leadless" power package where the connections are almost all "hidden" on the bottom side of the device. As such the board space requirement is no more than 3.3 x 3.3 mm². The low Rds(on) of this Power MOSFET device of typically 6 mOhm allows for a Drain current of up to 40 A at 25°C case temperature. Drain-Source voltage can be up to 30 V, with a single pulse avalanche capability of 100 mJ. Parts are not only suited for DC operation, but due to their low turn-on and -off characteristics also for high frequency switching. Typical applications are USB charger, power management units, battery powered devices, load switches and polarity protection. Beside the AEC-Q101 qualified part DI040N03PT-AQ also the commercial grade version DI040N03PT can be ordered. Samples are available from stock.


Correct Bending of Axial Lead Wires: Let us do it for you!

Correct Bending - flower bent down

Like flower stalks do not like to be buckled, also axial leads of semiconductor diodes require a certain, "sensitive" treatment, in order to reach a long lifetime of the part.

Axial lead devices are still used in huge volumes for many kinds of applications. Especially in (very) high voltage circuits they provide superior creepage and clearance over "small" SMD components. Before such parts can be assembled into the PCB, their lead wires need to be cut and bent for the desired length and raster. If this mechanical process is done in the wrong way, especially with no or no sufficient strain relief, a (pre-)damage of the semiconductor chip is likely. At best the part is broken immediately and can be replaced, but in worst case it will appear only later in the field with all the unwanted and unnecessary consequences. Our Application Note describes how the cutting and bending has to be done the right way, for high productivity and high reliability of the produced circuits.

And if you let us do the entire process for you, you can be assured that all components arrive in perfect shape and quality at your site. You just need to assemble it! Send your mechanical drawing or even a sketch of how you would like to have the leads formed to your authorized Diotec sales channel, and we will provide you our offer for this customer service.


Small Signal Devices: Performance without Compromise

small signal

Small signal devices are semiconductor components found in almost every electronic circuit. They are used in a variety of applications such as analogue and digital broadcasting, logic ciruits, computing, controls and automation, processing "small signals" with short duration, low power and mostly high frequencies. The current market demand for portable digital communications, signal processing equipment and other handheld multimedia creates the necessity for miniaturized electronic components to enable slim and small designs, but without compromising in funcionality and performance.

Diotec offers a wide range of small signal components including high-speed Switching Diodes, Zener Diodes, ESD Protection Diodes, Voltage Regulators, Bipolar Transistors and MOSFETs. Package sizes are 0603, 1608, SOT-23, SOT-323, SOT-363, SOT-26, SOD-523, (Power)SOD-323, SOD-123(F/FL), SOD-106 and SOD-80C. With the exemption of the last two packages, all of these are totally free of lead (Pb), with other words fully RoHS compliant without any exemption. You will find more detailed infomation in our actual Application Note.


S8A to S8M Series: 8A Rectifier in SMD

S8A series

Replacing through-hole bridge rectifiers by four single SMD dicretes is often limited by a too low forward surge current rating (Ifsm) of potential candidates. The S8A to S8M Series by Diotec offers a powerful solution in surface mount SMC package. Unlike similar parts made by competitors, these parts feature a comfortable Ifsm rating of up to 320 A at 50 Hz/10ms half sine waves, or even 350 A at 60 Hz/8.3 ms. This allows replacement of through-hole bridges and thus saving of assembly costs wherever a high surge current is required, while average output current is in a lower range. The average forward current of 8 A at maximum 100° C terminal temperature would allow to build an equivalent 16 A bridge by using four parts in bridge configuration.

At 500 W input power and 230 V mains, the rectifier stage is loaded just a bit higher than with 2 A. Inrush current limitation is however often reduced to an absolute minimum effort for cost savings, which in contrast requires a very high Ifsm rating of the input bridge. As such, SMD versions are often not suitable. The S8A to S8M Series is closing this gap. The K and M types having 800 V respectively 1000 V are for 230 V mains, while the G and J with 400 V and 600 V match to 110 V supplies. The lower reverse voltage types A to D with 50 V to 200 V can be used for polarity protection purposes where Schottkys are not suitable, e. g. due to low leakage current requirements.



  • Repetitive Peak Reverse Voltage of up to 1000 V
  • Average Forward Current of 8 A
  • Forward Surge Current of 320 A (50 Hz/10 ms), respectively 350 A (60 Hz/8.3 ms)
  • DO-214AB / SMC package
  • For automatic SMD assembly


New Data Sheet Layout Offers More Comprehensive Information

data sheet new layout

You might have realized on recently published data sheets that we now offer as slightly refreshed layout and additional, useful information. The devices are displayed on the front page in a 3D view with bottom and top side. As such, designers can immediately see how the device mechanically looks like. The mechanical sizes including tolerances are shown on the following page in a technical drawing.

For most of our parts we offer now SPICE models and STEP files, for electrical circuit simulation software and mechanical board design using CAD systems. Both is mentioned directly under the 3D view and above the next enhancement, which is a clear electronic device symbol including all connections. Below of all is the harmonized system (HS) code, which is not only important for export purposes, but also for compliance declaration like the EU REACH directive. The ROHS compliance declaration under "Features" has been completed by the according exemption: e. g. "7a" for the internal high melting type solder alloy based on lead or by "w/o exemption" which means that parts are totally lead-free!

The watermark behind the text is the proof that you have the original Diotec data sheet in front of you. We will step by step change all of our data sheets to this new layout; the already changed ones can be found here: https://diotec.com/en/datasheets.html