Medical Design Briefs - December 2021 - 30

The Q factor represents the efficiency of a capacitor's
rate of energy loss. High Q capacitors lose less energy
reducing the need to dissipate or cool the heat which protects
the board from damage and performance loss in sensitive
and high liability applications. Not all MLCCs are
created equal, even among the high performance MLCCs,
yet ensuring a consistent level of performance is critical
for the high reliability applications.
" If an MLCC manufacturer is not tightly controlling the
layer count, they might be providing 10-layer batches in
one batch and then later deliver 17-layer parts in a subsequent
batch, " explains Horton. " These two parts will not
perform the same at high frequencies. "
■ Domestic Supply Ramping Up
Domestic sources of MLCCs needed in medical devices
have been ramping up their capacity. Increased domestic
MLCC supply means a customer will not need to delay
the build and shipments of their products because of a
capacitor delay.
Drawing upon its focus on high-Q and high-voltage
MLCCs, Johanson, for example, has expanded its capacity
to fill some of the supply void caused by the shift in market
focus to smaller capacitors.
" We've been investing in expanding our capacity for several
years now through a modernization of our production facility
and the opening of a second production line that will essentially
double our MLCC output, " says Horton. " We can take
that even higher with more production shifts. "
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30
Cov
ToC
Increasing domestic high-voltage MLCC supply also means that customers do
not need to look beyond ceramic capacitors to satisfy their demand.
At the time of the preparation of this article, Johanson is
quoting large size high-voltage MLCC order fulfillment times
at 10 weeks.
■ Ceramic Is the Material of Choice
Increasing domestic high-voltage MLCC supply also means
that customers do not need to look beyond ceramic capacitors
to satisfy their demand. As a result of the long lead times,
replacing a MLCC with a polymer or tantalum capacitor may
be considered; however, trade-offs in performance and optimal
operating conditions need to be carefully considered.
Polymers in capacitors can be degraded by the effects of heat,
which is a consideration for some applications. The thinness of
the dielectric layer in polymer capacitors means the maximum
voltage is lower than in ceramic capacitors making it inappropriate
for high-voltage products. Polymers are also not available
in the low values of capacitance that ceramics provide.
A tantalum electrolytic capacitor consists of a pellet of
porous tantalum metal as an anode covered by an insulating
oxide layer that forms the dielectric surrounded by a liquid or
solid electrolyte as a cathode. While regarded as a reliable and
a suitable alternative to MLCCs, tantalum capacitors are generally
polarized which means they may only be connected to a
DC supply. An unfavorable failure mode may lead to thermal
runaway and fires. Tantalum capacitors are also currently experiencing
extended sourcing lead times.
" There's just no reason to move away from ceramic for your
high-voltage, high quality applications, " says Horton. " There is
now a growing domestic MLCC supply available to meet our
domestic needs. "
Shifts in supply and demand within the overall MLCC market,
which is estimated to grow to a $12 billion market by 2025,
have caused critical supply shortages for medical equipment
manufacturers that require a higher quality, larger format
multi-layer ceramic capacitor. As the largest MLCC manufacturers
continue to compete for the demand of the MLCCs
used by sectors like telecom, smart phones and mobile devices,
new domestic supply sources are stepping in to meet the need
for a reliable and timely supply of high performance MLCCs.
For more information, visit http://info.hotims.com/79420-367.
Medical Design Briefs, December 2021
http://info.hotims.com/79420-367

Medical Design Briefs - December 2021

Table of Contents for the Digital Edition of Medical Design Briefs - December 2021

Medical Design Briefs - December 2021 - Intro
Medical Design Briefs - December 2021 - Cov4
Medical Design Briefs - December 2021 - Cov1a
Medical Design Briefs - December 2021 - Cov1b
Medical Design Briefs - December 2021 - Cov1
Medical Design Briefs - December 2021 - Cov2
Medical Design Briefs - December 2021 - 1
Medical Design Briefs - December 2021 - 2
Medical Design Briefs - December 2021 - 3
Medical Design Briefs - December 2021 - 4
Medical Design Briefs - December 2021 - 5
Medical Design Briefs - December 2021 - 6
Medical Design Briefs - December 2021 - 7
Medical Design Briefs - December 2021 - 8
Medical Design Briefs - December 2021 - 9
Medical Design Briefs - December 2021 - 10
Medical Design Briefs - December 2021 - 11
Medical Design Briefs - December 2021 - 12
Medical Design Briefs - December 2021 - 13
Medical Design Briefs - December 2021 - 14
Medical Design Briefs - December 2021 - 15
Medical Design Briefs - December 2021 - 16
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Medical Design Briefs - December 2021 - 18
Medical Design Briefs - December 2021 - 19
Medical Design Briefs - December 2021 - 20
Medical Design Briefs - December 2021 - 21
Medical Design Briefs - December 2021 - 22
Medical Design Briefs - December 2021 - 23
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Medical Design Briefs - December 2021 - 25
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Medical Design Briefs - December 2021 - 28
Medical Design Briefs - December 2021 - 29
Medical Design Briefs - December 2021 - 30
Medical Design Briefs - December 2021 - 31
Medical Design Briefs - December 2021 - 32
Medical Design Briefs - December 2021 - 33
Medical Design Briefs - December 2021 - 34
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Medical Design Briefs - December 2021 - Cov3
Medical Design Briefs - December 2021 - Cov4
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