Protection of USB 2.0 Applications Series: TVS Diodes & ESD Suppressors

Welcome back to our USB 2.0 Applications Series!

USB-Interface is the most distributed PC interface in the world. Usage in industry-applications is more and more common. Let’s have a look at the TVS diodes and ESD suppressors.

The ESD suppressors are special raised varistors with a low and defined intrinsic capacitance. For ESD suppression, the TVS diode arrays WE-TVS with very low capacitances (<2pF) or the ESD Suppressors WE-VE (capacitances down to 0.05pF) are your preferred choice.

Wurth Electronics has three different series:

WE-VE standard series: Capacitances of 1pF to 120pF and voltages from 5V to 24V

WE-VE “ULC” series: Capacitance of 0.2pF, suitable for signal lines up to 12V

WE-VE femtoF series: Capacitance of 0.05pF and rated voltages of 6V, 14V and 26V

The first two series also have four-fold array packages available.

Why ESD Protection?

Since the first electronic developments, all the parts are subjected to electrostatic discharge. ESD events have peak voltages up to 30kV and are very dangerous for all kind of integrated circuits.

However, some state-of-the-art ICs are protected against ESD pulses but real world conditions show daily that an additional protection device is indispensable. On the one hand to have the whole board ESD free and on the other hand to develop more reliable products to satisfy the needs of your customers.

Why EMI Suppression?

With the increase in electronic/electrical products and the need to have wireless connectivity in today’s global markets, there is an increased requirement to ensure that your product is immune to the impacts caused by both the intentional and unintentional RF environment. Only if you consider now which EMI phenomena impacts on the product, will you be able to design in the appropriate protection and reduce time to market.

In addition, the product must not generate excessive levels of EMI, which is typically assessed by an EMC Test Laboratory. Should the product fail, costs to implement remedial work will increase aggressively.

Protection of USB 2.0 Applications Blog Series Continues

In case you missed it, read our first part of the USB 2.0 Applications Series here.

Check back in for more USB application protection tips as we explain how to find suitable parts, show eye pattern tests, and much more ahead!

To request a quote or to order samples of products to protect your USB ports, click here.

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