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Components tap WLAN chip sets
(excerpt)
By Gina Roos / EE Times / September 4, 2003
Driven by suppliers of wireless-LAN chip sets, passive-component
manufacturers are developing innovative devices and technologies to meet
the requirements for high-performance characteristics such as quality, or
"Q," factor, equivalent-series resistance (ESR) and small packaging in the
WLAN.
Next-generation components for WLAN applications will most likely come in
the form of antennas, integrated passive devices and module designs, many
of them based on low-temperature co-fired ceramic (LTCC) technology for
high performance and small size.
In many cases, passive-component suppliers are already ramping up
production on low-pass and bandpass filters for WLAN applications that
feature surface-mount packaging, low profiles and light weight.
 
NIC Components' answer to a host of wireless
applications is its wide range of low-ESR and high-Q NPO
ceramic chip capacitors. Designed for high-speed, high-frequency
applications such as Bluetooth and WLAN products, the
NMC-L and
NMC-M chip
capacitors are available in a capacitance range of 0.5 to 150 pF.
NIC Components Corp.
www.niccomp.com |
www.RFpassives.com |
www.lowESR.com
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Plastic fantastic
(excerpt)
By Chris Edwards /
EE Times,
3 April 2002
In power supplies, output filter
capacitors are bearing the brunt of the problems caused by the rapid
increase in processor frequencies. In PCs, speeds are already past 1GHz,
and embedded processors for high-end comms systems are seeing similar
speeds.
Add to that the gradual lowering of supply voltages and increase in
current, and you have the situation where the types of capacitor used in
output filters need to go through some major changes.
It is not all bad news, as the moves seem to be in the direction of
technologies that should prove to be more reliable over time.
Basically, wet electrolytic capacitors have a definite shelf life and dry
tantalums can catch fire when driven too hard. Temperature is generally a
weak spot for wet electrolytics, but that has not stopped some suppliers
from using better seals in their designs.
But the main trend for many capacitor makers is towards various forms of
polymer capacitor. The wet electrolyte in aluminium capacitors or the
manganese oxide gets replaced by a polymer compound. Many of the capacitor
suppliers have followed suit with aluminium and tantalum-based products.
The polymer in these capacitors is generally selected for its ability to
heal against short-circuit defects in the capacitor and reductions in
equivalent series resistance (ESR).
The lower ESR often means that smaller capacitors can be used to smooth
out the current in power supplies as ESR is more important, because of the
heat dissipated through resistance, than the actual capacitance.
High leakage current can be an issue in many metal-polymer capacitors but
is not generally a big problem in power supplies. As most electrolytics
are used to smooth out large current pulses, a lower ESR can mean
designers end up using smaller capacitors because less energy will be lost
as heat.
As well as Sanyo, Kemet and Cornell-Dubilier,
NIC Components, Nichicon, Panasonic and Tokin — the latter
following its purchase of NEC's passives operation — have devised
aluminium-polymer capacitors. Kemet's AO-CAP is designed to mimic an SM
ceramic capacitor rather than an axial aluminium capacitor, and takes ESR
down to below 20mohm, for a sub-150µF device working at 4V. OS-CONs typically
have ESRs of around 40mohm in similar sizes. Epcos, Kemet and Nichicon have
used similar polymers to replace the manganese oxide in 'dry' tantalum
electrolytics to reduce ESR. [
SOLID ELECTROLYTE -
POLYMER ALUMINUM E-CAPS ]
The plan for larger capacitors is to reduce the number that have to be
used in parallel in low-voltage power supplies that need to deal with high
currents, such as the regulators needed for Pentium 4s.
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Impedance cuts for low voltages and high speeds
EE Times, 9 March 2002
Manufacturers are taking aim at high-frequency impedance and equivalent
series resistance with some of their latest electrolytic offerings.
NIC
Components Europe
NRSJ series of radial-leaded aluminum electrolytic capacitors
offer equivalent series resistance down to 0.013½. The capacitors have
been designed for lower voltage, high-current circuit designs.
Available with capacitance values ranging from 100 to 2700µF and voltages
of between 6.3 and 50V DC, the range is suited to applications in power
supplies, DC/DC converters and switchers. They have a ripple current
rating of up to 2.55A rms at 105°C and 100kHz.
www.niccomp.com or
www.lowESR.com
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Solid-aluminum caps
aim at output-filter circuits
EE Times - February 7, 2002
 Melville,
N.Y. -
NIC Components Corp. has an improved version of its
NSP
solid-aluminum-electrolytic capacitors. The line targets output-filter
circuits for low-voltage and high-current dc/dc converters, switching
power supplies and voltage regulators.
The surface-mount , specialty-polymer solid-electrolyte caps feature
ultra-low equivalent series resistance (ESR) and high ripple current
ratings at high frequency. New are an expanded capacitance range and
improvements in ESR and ripple-current ratings.
The new capacitance range is from 2.2 micro-farad to 390 micro-farad with
voltage ratings from 2 volts dc to 16 V dc. The 100-kHz ESR specs have
been reduced to 0.012 ohm, and the ripple current ratings have been
increased to 3,000 milliamps rms (100 kHz, +105 degrees C).
The parts, in a standard D case, run at 55 cents to $2.20 each in
production quantities. Lead time is six to 10 weeks.
www.niccomp.com or
www.lowESR.com
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Solid Al caps tout low ESR
EE Times (10/19/01, 10:00 a.m. EST)
Melville, N.Y. - NIC Components is shipping its NSPZ series of surface-mount solid-polymer aluminum
electro-lytic capacitors. The caps are said to offer ultra-low ESR and impedance as low as 0.025 ohm, with ripple current ratings up to 2.5 Arms.
 Capacitance values range from 15 microfarads to 680 microfarads (+/- 20 percent capacitance tolerance). Voltage ratings range from 4 to 25 volts dc. Case sizes (DxL) include 6.3 mm2, 8 x 7 mm and 10 x 8 mm.
The caps are rated for operation from -55 degrees C to 105 degrees C and are compatible with reflow-soldering processes. They are supplied on tape and reel for use with automated pick-and-place assembly systems.
Pricing is $0.77 to $1.05 each in production quantities. Lead time is eight to 10 weeks.
www.niccomp.com or
www.lowESR.com
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Small inductors aim at wireless
EE Times
(06/20/00, 1:55 p.m. EST)
 MELVILLE, N.Y. — The NML series of multilayer chip inductors in 0402 and 0603 packages from
NIC Components Corp. are said to feature high Q (greater than 50 at 1 GHz; less than 27
nano-henries) for high-frequency wireless communication applications.
The small package size suits the inductors for handheld applications and very dense circuit designs, the company said. Inductance values range from 1 to 56 nH (0402) and 1.5 to 220 nH (0603) in plus/minus 0.5-nH, plus/minus 5 and plus/minus 10 percent tolerances. Operating temperature range is -40 degrees C to 85 degrees C.
The inductors are supplied on paper tape compatible with automated pick-and-place machinery and reflow soldering. Pricing is 6 cents to 8 cents each in production volumes, with delivery in six to 10 weeks.
www.niccomp.com |
www.RFpassives.com
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