Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11

thomasjb•about 2 hours ago

https://www.digikey.ie/en/products/detail/murata-electronics...

A mere 2.40 euros each!

matherial•about 1 hour ago

All silicon capacitors are relatively expensive, they're specialty parts that generally go into expensive things (mmWave airport scanners, optical backhaul, etc).

TheJoeMan•about 1 hour ago

Did they build 5,000 airport scanners at once? MOQ is brutal!

IndrekR•21 minutes ago

One scanner has way more than one channel…

threatripper•about 1 hour ago

Figure 1 made me laugh out loud.

stn8188•29 minutes ago

It may seem overly simplistic, but 2-port models for capacitors can be configured in series (as shown here) or in shunt (much more common for power distribution network applications). So, as basic as you might think this diagram is, it is entirely expected to be there so that we instantly know if the S-parameters are in series or shunt configuration - it would be more unusual if it were missing.

aaronmdjones•about 1 hour ago

Same here. That's made my week.

tedd4u•about 1 hour ago

1 •--||--• 2

Figure 1 block diagram

dlcarrier•about 1 hour ago

Someone's actually using nF, instead of 0.022uF or 22,000pF.

PowerElectronix•about 1 hour ago

I never understood why nF is less frequently used than uF or pF. To me, the logical thing is to express the capacity in units that are between 1 and 1000, like it's done with resistors and inductors.

lisper•about 2 hours ago

Why is this a component? Couldn't you just make one of these out of PCB traces?

bri3d•about 1 hour ago

Certainly not at these frequencies and corresponding high capacitance values; getting 22nF out of a PCB even with ECM would require quite a large surface area and at 220GHz you can't have that since your wavelength is so short; you'd just be making a giant resonator instead.

IndrekR•4 minutes ago

Length of this capacitor is close to half-wavelength of 220 GHz (in vacuum).

Using siblings of this broadband capacitor (40 GHz, same package) in some designs. In assembly, those require decent process control. This 0201M package is closer to 01005 passives in pad size. Typically no solder paste is used, just flux. Solder mask alignment has to be very tight (thin web used as a dam only).

Cost per cap is reasonable where it is actually needed, other parts of the system are often orders of magnitude more expensive at those frequencies where performance matters. Where it gets the very high performance, is pillars/channels etched into silicon quite similar to how DRAM capacitors are made, just a “little bit bigger”. This allows for very low inductance and thus very high resonant frequency.

Eduard•21 minutes ago

ECM = Embedded Capacitance Material.

It is a special PCB laminate designed to create capacitance inside the PCB stack-up, typically between closely spaced power and ground planes.

matherial•about 1 hour ago

No, not if you want 22 nF. That's a pretty substantial capacitance. It would need to be quite big on a PCB. That would mean significant inductance, and thus, bad performance at high frequencies.

rayiner•about 2 hours ago

I love the block diagram lol.

Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11

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