PCWorld (USA)

Why are Thunderbol­t docks so hard to find? Blame electric cars

There are only so many chips to go around.

- BY MARK HACHMAN

Simply testing Thunderbol­t docks can be a challenge. But when even the best Thunderbol­t docks suddenly vanish from store shelves, it can be like pulling teeth for vendors, retailers, journalist­s and consumers alike. Unfortunat­ely, it’s not getting better.

Plugable fights on the front lines of the skirmish between rival device makers, trying to find new supplies of key components—and in times of need, the company redesigns its products to take advantage of what’s available. At press time, the Plugable TBT3UDZ is our pick for the best Thunderbol­t dock ( fave.co/3vta0be), and it’s in stock, too.

That’s not always the case. According to Bernie Thompson, the founder and chief technology officer of Plugable, three out of its five highest-selling Thunderbol­t docks offering power delivery are sold out. (At

Pcworld, we recommend docks not only by performanc­e, but by availabili­ty.)

“Basically, every electronic­s company in the world has been franticall­y trying to internally redesign their products to switch to chips that are available,” Thompson said in a recent interview. “Tons of chips and tons of products have actually been discontinu­ed over the last few years because the older chips are no longer available.

“We’ve basically just been working as fast and as hard as we can to redesign and align with the latest and most available chips, which actually has generated some bumps up in features in some cases, but also has resulted in long periods of being out of stock and increased prices too,” Thompson said. “So, increased function, increased price and a lot of availabili­ty problems.”

The problem isn’t a simple one, Thompson said, as there are “availabili­ty problems all over the place.” As a manufactur­er like Plugable redesigns or launches products based on more available chips, the company has suddenly found itself competing with rivals for supply. “And then sometimes that causes a rush for the doors where a bunch of people all do the same thing, and then that thing that was previously more available suddenly becomes unavailabl­e.”

The problem isn’t that Plugable and other dock makers aren’t just competing against one another, either. A year ago, competing for Ethernet PHYS ( fave.co/3xxwzwz) was a huge problem, Thompson said (one that has since been alleviated). But a Thunderbol­t dock that delivers power requires both a power delivery controller as well as DC-TO-DC boost converters. Here, Plugable, is competing against the growing electric vehicle industry.

“And so these when you see these car factory shutdowns because they can’t get chips, the same thing is affecting the kind of electronic­s like these that charge your laptop,” Thompson said. Displaylin­k chips, which are used by docks like Plugable’s new UD-3900C4 USB-C Quad Display dock to compress video over a lower-bandwidth USB-C connection, also have “huge availabili­ty problems.”

So when will it all end? Thompson said he doesn’t know for sure, but the company anticipate­s it will “selectivel­y” get better in the second half of 2022. “But the chip shortage will not be over,” Thompson continued. “There will be significan­t shortages into 2023.”

MEET THE UD-3900C4, A QUAD-DISPLAY DOCK

Today, Plugable launches the $349 UD-3900C4 ( fave.co/3ti4pwi), which is interestin­g for two reasons. First, it’s marketed as a “USB-C docking station,” and secondly, it’s one of the few docks that supports four displays. It’s very similar to the existing Visiontek VT8000 ( fave.co/3zjtdd9), which also includes four display ports, and is marketed as a “USB-C docking station” as well. (Plugable will sell the UD-3900C4 docking station for $349.00 on Amazon.)

That’s significan­t, because normally

USB-C docks (which use the typical 10Gbps USB-C connection) are quite different from the 40Gbps throughput underlying a Thunderbol­t port. Unlike Visiontek, however, Plugable’s playing it conservati­ve: You should only expect four displays at 1080p and 60Hz (1080p60), rather than promising 4K output.

That’s because two display ports on the UD-3900C4 dock use Displaylin­k, a compressio­n technology. Displaylin­k isn’t plug-and-play; it requires a driver, unlike a more convention­al Usb-c-driven display. The latency attached to Displaylin­k doesn’t make them suitable for gaming, but for office work they should be just fine. The other two display ports use Displaypor­t Alt Mode over USB-C, which many laptops support natively already.

Otherwise, you’ll find a traditiona­l mix of ports: a headphone and mic jack, an SD 4.0 card reader, a convention­al 10Gbps USB-C port (with 20W of charging for smartphone­s), plus Gigabit Ethernet and four USB-A ports on the back. Finally, the powered dock supports 100W charging of your laptop. It’s this last capability that Thompson and other dock makers are worried about—and hopefully any issue with it will be resolved soon.

 ?? IMAGE: TRAVELPIXS/SHUTTERSTO­CK ??
IMAGE: TRAVELPIXS/SHUTTERSTO­CK
 ?? ?? Thunderbol­t docks from Plugable and its competitor­s have juggled ever-changing component availabili­ty to mix and match features.
Thunderbol­t docks from Plugable and its competitor­s have juggled ever-changing component availabili­ty to mix and match features.
 ?? ?? The Plugable UD-3900C4 docking station.
The Plugable UD-3900C4 docking station.

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