Blog

Isolated RS-485 interface based on 4-channel digital isolator with integrated DC/DC converter

Würth Elektronik — Mon, 01 Dec 2025 12:49:00 GMT

This design example shows an isolated RS-485 interface using a 4-channel reinforced digital isolator with an integrated DC/DC converter, reducing component count and board space. The design is optimized for half-duplex operation at data rates up to 10 Mbps and meets CISPR 32 Class B radiated emission standard.(read more)

Taking A Closer Look at Mechanical Components and Cleaning Processes

Würth Elektronik — Thu, 27 Nov 2025 11:56:00 GMT

Over the years, we have frequently received questions regarding the washing process of mechanical switches. We have observed that washing has become a standard part of the production process for customers. Washing the PCB helps remove residues on the PCB to avoid corrosion, short circuit or maybe the customer has afterward another coating or potting processes. And in the market, we also see different definitions like dustproof, waterproof, IP-rated, washable. But in most of the times, manufactures still do not allow customer to wash their mechanical components.(read more)

REDFIT SKEDD Crimp Connector #PLUGTHEPOWER

Würth Elektronik — Mon, 24 Nov 2025 12:08:00 GMT

SKEDD is a technology developed by Würth Elektronik that allows connectors to contact directly with the printed circuit board without soldering. The combination with the crimp technology of the REDFIT Crimp SKEDD Connector offers significant advantages over soldered connectors.(read more)

SN024 | Transient suppression at different interfaces

Würth Elektronik — Tue, 18 Nov 2025 12:07:51 GMT

Due to the increasing number of electronic devices on the public power grid and network communication via data lines, measures to prevent mutual interference caused by electromagnetic interference are becoming increasingly important. Protecting the wired interfaces against transient overvoltage is particularly important.(read more)

Free hands on training on Cybersecurity

Würth Elektronik — Mon, 08 Sep 2025 11:03:00 GMT

Take advantage of the hands-on training with the Cordelia-I EV-Kit on GitHub! This free guide teaches you how to establish a secure wireless connection and implement protocols like MQTT and TLS. Experiment with the EV-Kit and gain practical experience in IoT cybersecurity.(read more)

ANP146 | Theoretical Insights and Practical Applications of the WE-CMDC Series Common Mode Chokes

Würth Elektronik — Mon, 25 Aug 2025 08:51:00 GMT

Common mode chokes (CMCs) are widely used to filter out interference components in electronic circuits. These components specifically target noise signals that appear on line pairs with the same amplitude and phase relative to the reference ground. Accurately modeling the behavior of CMCs is crucial for understanding the component in detail. Furthermore, the transfer of the model and its functional simulation into practice must be understood in order to achieve their effective integration into complex systems and for enabling targeted optimization of their filtering performance. This paper presents a simulation of a common mode choke and compares the results with real-world measurements. Additionally, it explores unconventional applications of CMCs, expanding the potential use cases for these components. Notably, the parasitic properties of CMCs are also leveraged as functional elements within certain circuit designs, demonstrating their versatility beyond traditional applications.(read more)

ANS018 | EMI Filter Design for Non-Isolated DC/DC Converters

Würth Elektronik — Sun, 17 Aug 2025 07:35:00 GMT

Today, many industrial applications run with input voltage levels such as 5VDC or lower, as shown in Figure 1. The power distribution system used to power such applications is often a DC bus voltage of 24VDC. DC/DC power modules are commonly chosen to handle the conversion of the higher DC bus voltage down to the lower voltage level.(read more)

REDCUBE PRESS- FIT Terminals for automotive applications

Würth Elektronik — Wed, 30 Jul 2025 08:05:00 GMT

REDCUBE PRESS-FIT terminals stand out as the go-to choice for robust high-power connections at the PCB level in automotive applications. They're widely employed for connecting wiring with cable lugs to circuit boards. The current rating of REDCUBE PRESS-FIT is seriously impressive. Even with the same power output, these components generate the least amount of heat compared to alternatives for powering PCBs.(read more)

ANS023 | Transient protection SIP-3

Würth Elektronik — Mon, 14 Jul 2025 13:48:00 GMT

Transient over voltages often occur in industrial environments due to an extensive electrical infrastructure. In order to develop an efficient filter to limit transient over voltages, many influencing parameters must be considered. Today, many industrial applications run on logic input voltage levels such as 5 VDC or lower, as shown in Figure 1. The power distribution system used to power such applications often run on a DC bus voltage of 24 VDC. Switching DC/DC converters are commonly chosen to handle the conversion of the higher DC bus voltage down to the lower logic voltage level.(read more)

ANP143 | TVS diodes: basics, function and their applications

Würth Elektronik — Thu, 10 Jul 2025 13:40:58 GMT

TVS diodes (transient voltage suppressors) are used to protect circuits from high voltage spikes. They are designed to operate in reverse bias and work by discharging interference current when the reverse voltage exceeds the ‘avalanche breakdown potential’. They are essentially high-power Zener diodes and represent a special form of avalanche diodes. TVS diodes can withstand large power spikes (hundreds or thousands of watts), but Zener diodes have a narrower voltage tolerance. TVS diodes generally have a higher parasitic capacitance than Zener diodes. They are available in either unidirectional or bidirectional versions. Unidirectional TVS diodes block up to the rated voltage in one direction and behave like a normal diode in forward bias in the other direction. Bidirectional TVS diodes block current flow in both directions up to the rated voltage (good for protecting AC signals). Unidirectional TVS diodes have a much faster response time than their bidirectional counterparts (e.g., 5 ps compared to 5 ns). The electrical symbols for the unidirectional and bidirectional TVS diodes are shown in Figure 1.(read more)

ANP118 | Acoustic noise & Coil whine effect

Würth Elektronik — Tue, 08 Jul 2025 08:16:00 GMT

The ability to hear is one of the most important aspects of life. In industry, sounds are often used specifically to evoke a response. In some cases, however, hearing sounds is not desired and can even be a disruptive factor. In the field of electronics, sounds from electronic components are undesirable unless they have been installed for that specific purpose. This application note explains how a noise can be perceived as disturbing, what causes electronic components to generate noise and what possible solutions are available to avoid or dampen such noises.(read more)

ANP135 | The SEPIC with coupled and uncoupled inductors

Würth Elektronik — Tue, 01 Jul 2025 11:08:00 GMT

The Single-Ended-Primary-Inductor-Converter, popularly known as SEPIC, is a non-isolated, switching power supply topology generating an output voltage that can be higher or lower than the input voltage. This is a common requirement in battery-powered applications as well as those with fluctuating input and/or output voltages, like photovoltaic converters (PV), automotive electronics, offline LED lighting and battery chargers, amongst others.(read more)

Plastic Melting and Flammability: Is there any relationship?

Würth Elektronik — Thu, 19 Jun 2025 08:32:00 GMT

We often receive questions from customers, such as, why during the customer reflow process, e.g. 245°C, a SMD component will be melting, even though the component supplier’s datasheet shows a flammability grade withstanding 245°C or above.(read more)

ANS022 | Bridge capacitor for isolated power modules, the whole truth, no myths

Würth Elektronik — Wed, 28 May 2025 07:41:19 GMT

Deciding which type of common mode EMC filter to choose when designing an isolated DC/DC converter or a power module to pass the EMC test still often leads to less-than-optimal solutions. Knowledge about common mode interference and its minimisation is characterised by myths. ‘Common mode interference is quite difficult to understand’ is the first argument put forward. Followed by ‘common mode interference is more of a trial-and-error process’. A common mode choke is almost exclusively cited as the method of choice for minimisation. However, this way of looking at things neglects the fact that common mode interference can also be explained with the help of basic electrical interactions or parasitic elements and Kirchhoff's law. The purpose of this article is to provide a basis for understanding the origin and propagation of common-mode interference and an approach based on a formula for designing a simple filter to minimise common-mode interference(read more)

ANP142 | Effects of molded power inductor degradationndue to higher voltage or temperature in a DC/DC converter

Würth Elektronik — Wed, 02 Apr 2025 09:22:00 GMT

For DC-DC converter applications molded power inductors enable both smaller footprints and lower profile due to the properties of the magnetic material. The reduced dimensions of current designs demand the employment of smaller inductors capable of operating at elevated voltages and currents in more extreme thermal conditions. The higher electrical and thermal stresses can lead to an increase in magnetic core loss over time due to material degradation related to the percolation phenomenon. (read more)