Passive Components Still See Ink And Innovation

Passive components such as resistors, capacitors and inductors might seem to be old and stodgy with nothing new to write about, but nothing could be further from the truth. Not only do we continue to write articles on passives, but there's lots of innovation going on with these devices as well.

When people first learn about electronics, they’re usually taught how resistors, capacitors, and inductors interact in a circuit. Since these components have been around a long time, you might think there’s nothing more to say about them and certainly not much innovation going on. Nothing could be further from the truth. Just look at our annual list of the Top 101 Components to see that fully 10% of them are passives.

We’ve written about these specific products and more over the past year. For instance, in our new online Ask The Expert series, Tamara Schmitz, an applications manager at Intersil, wrote about selecting components for prototypes. In particular, she wrote about selecting resistors. In the photo that accompanies her article, the resistors look like the common ones we’re all used to seeing.

But Tamara also writes about a dizzying array of choices you might find at a distributor’s Web site. She notes that “they are categorized by the way they are mounted: surface mount, through hole, chassis mount, array… or two others: precision or accessories. Many designers just start clicking away and hope for pictures that can be deciphered.” You can find Tamara’s full post here.

Bill Laumeister of Maxim Integrated is also writing about passives, saying maybe they aren’t so passive after all. “These apparently passive components can, and do, change the signal in unexpected ways since they contain parasitic portions,” he said.

As an example of the continuing innovation in passive components, I’ll point to two resistors that were just introduced by Ohmite Manufacturing. These are the RW5 (5 W) and RW7 (7 W) surface-mount wirewound resistors (see the figure). As you might guess, their unique finned body style maximizes surface area and therefore cooling capacity and makes them a great fit for high-power-density applications. You can find a full description at These devices were just released in May, so it was too late for this year’s Top 101 list, but I’m sure you'll see them on the list next year.

Ohmite Manufacturing’s RW5 and RW7 surface-mount wirewound resistors sport a finned body style that makes them a great fit for high-power-density applications.

Please or Register to post comments.

What's Joe Desposito's Blog?

Blogs by Electronic Design's Editor-in-Chief


Joe Desposito

Joe Desposito has held the position of editor-in-chief of Electronic Design since July, 2007. He first joined the publication in 1998 as a technology editor covering test and measurement but quickly...
Commentaries and Blogs
Guest Blogs
Oct 7, 2015

Building Home or Very Small Office Electronic-Circuit Prototypes, Part 1 3

This first part in a series goes through the steps of creating a preliminary design for a small and inexpensive hobbyist/limited-technology-prototype build-and-test capability....More
Sep 16, 2015

What is All This Nanogenerator Stuff, Anyway?

Nanogenerators, which harvest energy from the environment, could be the next big thing in renewable energy....More
Aug 11, 2015

Proof-of-Concept Prototypes versus Manufacturing Design Preparations 4

I have designed many early-stage proof-of-concept (POC) circuits, and observed many others do the same thing. It seems that there is often a huge disconnect between clients and engineers, though, when it comes to the goals of a POC design. In simple terms, an engineer worth his salt will overdesign an early POC circuit. This is because Murphy’s law always applies, and POCs are about overcoming unknowns. By overdesigning the circuit, one is able to prove the client’s product POC can be made to work, and quickly....More

Sponsored Introduction Continue on to (or wait seconds) ×