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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


Application Note Small Signal Devices

How to bend and cut wires of Axial Lead Diodes in a correct way

BYG20 Series: Ultrafast Avalanche SMD rectifier diode


Discover our BYG20 Series, which is an Ultrafast Avalanche SMD rectifier diode in SMA Package having repetitive reverse voltage of 200 V until 600 V and average forward current rating of 1.5 A. Having non-repetitive peak reverse avalanche capability of up to 20 mJ and a very low reverse recovery time of less than 75 ns, these devices are well suited for high-side floating gate driver circuits, as a bootstrap diode. For half-bridge gate drivers, adding an external bootstrap diode in parallel with the internal one, can significantly overcome the problem of excessive power losses in the driver IC. A stand-alone operation is of course possible as well.

Further typical applications include output rectification in high frequency power supplies and forward converters as well as freewheeling diodes in inverters for consumer, automotive and telecommunication circuits.



  • SMD Package DO-214AC/SMA
  • Repetitive reverse voltage of 200 V to 600 V
  • High average forward current of 1.5 A
  • Reverse recovery time less than 75 ns
  • Controlled Avalanche Characteristics: 20 mJ


ESD9BL24P: All-Around Protection by Diotec's ESD Diodes


Diotec’s ESD9BL24P is a 24V, 350W, bidirectional Electrostatic Discharge (ESD) protection diode in a tiny “leadless” SOD-882/DFN1006 package.
It offers optimum trade-off between low capacitance and higher ESD robustness. This device is designed to safely protect electronic components from ESD transient surges of up to +/-30 kV as per IEC610004-2 standard (air and contact discharge) without any compromise in its performance and reliability. Its low capacitance of 0.5 pF ensures very low distortion of data signals in high-speed communication systems.

Typical applications include data line and I/O port protection, portable electronic devices but also LED lighting modules. In addition, due to the tiny package outline of only 1.0 mm x 0.6 mm board space, it is suitable for battery operated compact, portable devices.



  • Peak Pulse Power Dissipation 350 W
  • Peak Pulse Power current 6 A
  • Miniature Case Outline SOD-882
  • Low Junction Capacitance 0.5 pF
  • Low Leakage Current


ABS15Y: a Low Profile 2000 V Bridge Rectifier in SMD


Today’s modern high power density electronics are more vulnerable to electrical stresses than ever due to the component miniaturization. High demand scalable electronics such as LED Street Lamps require high reliable circuit protection. These devices are connected directly to the land line,
where lightning strikes are a permanent source for excessive voltage surges. It requires a bridge rectifier with high safety margin and also slim package outline to fit into the compact electronics.

Discover our ABS15Y, a low profile, high power, standard bridge rectifier. It offers an  impressive
reverse voltage of 2000V, an average forward current rating of 1.6 A/2.0 A (depending on pad size). It comes in an ABS package with only a height of just 1.4 mm. Thus they can be assembled on the bottom side of the PCB, where space is usually restricted. They are well suited for input rectification for applications like high voltage power supplies, LED Street Lighting Systems, 4G/5G Base Stations, Smart Meters and so on.



  • Repetitive peak reverse voltage of 2000 V
  • Average Forward current of 1.6 A/2.0 A
  • Ultra-low profile ABS package
  • Just 1.4 mm of device height
  • High creepage and clearance


New Sales and Marketing Manager for North and South America

business card

Diotec Semiconductor AG is glad to introduce our Sales and Marketing Manager Andrew Dixon for North and South America. He will be committed to develop our business with our distribution network and support locally new projects with local clients.

We are confident that with his experience we will be able to provide a more efficient and dedicated service to all the important area of North and South America.

Andrew Dixon
Mobile +1 832 345 7888

Customer Service is our Top Priority

– Dear Customer & Partner

Never give up

Do you want

  • to move at your own pace of production?
  • be rid of endless lead times?
  • be independent of your supplier?

Neither lockdowns, quarantines, nor curfews keep Diotec Semiconductor AG from delivering what you need when you need it.

We mean it when we call ourselves "Your Specialist for Semiconductor Solutions": we combine reliability and quality with flexibility, and provide alternate solutions with our discrete semiconductors.

Check out our website www.diotec.com, or reach out to our sales office and distributors near you.

Yours sincerely,

Diotec Semiconductor AG