New MMC cap candidate

• To: tesla-at-pupman-dot-com
• Subject: New MMC cap candidate
• From: Scott_L_Hanson-at-notes.seagate-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Fri, 28 May 1999 12:53:10 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Terry -

I've been following the MMC evolution with much interest, and have been
doing some research on candidate caps and availability.

I came across a new cap by Evox-Rifa (Evox-Rifa-dot-com) that looks very
interesting, although it is not yet widely available.

This is their model PHE448, a polypropylene film/foil "pulse capacitor"
described as optimized for "High frequency and high voltage applications
requiring capacitors with extremely high current handling capability, i.e.
high dU/dt values".

They are currently available in 1600 VDC/650 VAC  and2000VDC/700 VAC
ratings. The maximum dU/dt rating (in volts per microsecond) is 15,000 for
the 1600 VDC model, and 25,000 (!) for the 2000 VDC model. These ratings
seem higher than for other similar polypropylene film/foil caps.

Is there any consensus the dU/dt rating is the most critical parameter for
MMC usage?

Scott Hanson
Costa Mesa, CA

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