Spotlight on Passives
Multilayer Capacitors
The EVC series of multi-
layer monolithic ceramic
capacitors (MLCCs) from
Murata Electronics features
higher ripple-current capabilities, high voltage and
large capacitance per volume,
lower ESR and ESL compared to film and aluminum
electrolytic capacitors (better surge suppression), and
high operating temperature
assurance.
For example, the maximum-rated capacitor in this
series has a voltage rating
of 630 Vdc and an effective
capacitance of 12 mF at 400
Vdc. The allowable ripple
current is 20 Arms at 20 kHz,
with a dielectric withstanding
voltage of 750 V and maximum operating temperature
of 125°C. The case size is 32
mm 3 40 mm 3 3.7 mm for
capacitors with 250-Vdc, 400Vdc and 630-Vdc ratings or
16 mm 3 20 mm 3 3.7 mm
for a 35-Vdc rated MLCC.
Murata Electronics
Kyoto, Japan
www.murata.com
Ultra-Thin Supercapacitors
Tecate Industries’ CAPXX ultra-thin G Series of
general-purpose supercapacitors consists of singlecell and dual-cell versions.
The RoHS-compliant parts
boast low impedance and
a very low profile. The supercapacitors offer longlife performance at up to
2.3 V in the single-cell versions and 4.5 V in the dualcell configurations, with two
cells connected in series.
The GW Series features
a 28.5-mm 3 17-mm footprint and combines high
capacitance (up to 0.4 F at
4.5 V) with ESR as low as
60 mV in a thin (0.9-mm to
2.9-mm) package. The GS
Series features a 39-mm 3
17-mm footprint and combines high capacitance (up
to 0.7 F at 4.5 V) with ESR
as low as 34 mV in the same
thin package. Pricing starts
at $3.06 each in quantities
of 1000.
Tecate Industries
San Diego
www.tecategroup.com
400-F Supercapacitors
A supercapacitor from
Illinois Capacitor provides
400 F at 2.7 V in a 25-mm 3
62-mm package. The 407DCN2R7K has an equivalent
series resistance of 3 mV at
120 Hz with a load life of
87,600 hr at 25°C with 100%
of rated voltage.
Illinois Capacitor
Lincolnwood, Ill.
www.illinoiscapacitor.com
Polymer Capacitors
Nichicon’s F11 series of
capacitors uses layered-aluminum construction, conductive polymer electrolyte
and a three-terminal design
all in a molded package. This
structure decreases the magnetic field and inductance at
ultrahigh frequency, so the
part achieves excellent impedance characteristics over
a wide frequency range. The
layered-aluminum design of
the F11 series provides the
ultralow ESR and ESL over a
wide frequency range needed
in today’s high-performance
LSI.
With a voltage range of
2.5 V to 6.3 V and a capacitance range of 47 mF to 2400
mF, the F11 series’ operating
44
Power Electronics Technology April 2008
temperature range is -55°C
to 105°C. The capacitors
come in two sizes: 16.7 mm
3 12.1 mm 3 2.5 mm and
8.5 mm 3 5.3 mm 3 2 mm.
Both sample and production
quantities are available.
Nichicon
Schaumburg, Ill.
www.nichicon.com
HID Lighting Capacitors
Cornell Dubilier’s series
of HID lighting capacitors
are rated for 60,000 hr life at
100°C. The Type DL capacitors’ catalogued capacitance
values range from 5 µF to
75 µF with a voltage range
from 120 Vac to 400 Vac.
The Type DL capacitors
are packaged in cylindrical
plastic cases ranging from
30 mm to 50 mm in diameter and 55 mm to 117 mm
in length. Pricing starts at
$1 each.
Cornell Dubilier
New Bedford, Mass.
www.cde.com
Thin-Film Resistor Networks
A series of hermetically
sealed thin-film resistor networks from TT electronics
BI Technologies Electronic
Components Division meets
a number of military qualifications. The thin-film resistor
networks are hermetically
sealed in nitrogen-filled package cavities. The networks
feature a resistance range
from 10 V to 1 MV, with absolute tolerances to less than
±0.05% and ratio tolerance
to less than ±0.01%. TCRs are
less than ±25 ppm/°C, with
TCR tracking to less than
±5 ppm/°C (±1 ppm/°C is
also available).
Available with hot solder dip, tin-lead plate and
gold-plate finishes, the thinfilm resistor networks come
in through-hole DIP and
surface-mount packages.
Pricing starts at $35 each in
quantities of 50.
BI Technologies
Fullerton, Calif.
www.bitechnologies.com
RoHS-Compliant Resistors
Stackpole Electronics has
added to its lead-free/RoHScompliant resistor offering.
The LC series, a resistor network series, is available with
4 to 13 pins and circuit types
of bussed and isolated resistors in a low-profile SIP
package. The series is available in a power rating of
0.125 W per element, in resistance values from 30 kV
to 100 kV, in tolerances of
1% and 2% and a TCR of
100 ppm. Typical pricing for
the LC series starts at $34
each in quantities of 1000.
Stackpole Electronics
Raleigh, N.C.
www.seielect.com
Thick-Film Resistors
A thick-film resistor
from Vishay Intertechnology combines an extremely
low resistance with tight
tolerances and low TCR for
current-sensing applications.
The CRCW....-EL thick-film
power resistor offers a resistance range from 10 mΩ
to 100 mΩ, with tight tolerances of ±1% and ±5%. The
resistor features TCR of ±100
ppm/K, ±200 ppm/K, ±300
ppm/K, ±400 ppm/K and
±600 ppm/K over an operating temperature range of
-55°C to 155°C. The resistor
features a special metal glaze
on high-quality ceramic with
a protective overglaze.
The RoHS-compliant resistor offers lead-free solder
contacts on a nickel barrier
layer, with pure tin plating
www.powerelectronics.com
Spotlight on Passives
providing compatibility with
both lead-free and lead-containing soldering processes.
The device is offered in three
case sizes: the 0.1-W 0603,
the 0.125-W 0805 and the
0.25-W 1206. Pricing starts
at $0.08 each in 1000-piece
quantities.
Vishay Intertechnology
Malvern, Pa.
www.vishay.com
ESL enables a resonant frequency up to 500 kHz (mirror D case), delivering more
efficient filtering in dc-dc
power switching converters.
The mirror anode configuration also reduces the
height of the tantalum capacitors from 4.3 mm (E
case) to 3.1 mm (D case)
with further reductions down
to 2 mm maximum height
(Y case). Typical pricing for
the TPM mirror tantalum
capacitor starts at $2 each in
quantities of 1000.
Polypropylene Capacitors
From Electronic Concepts, the 5MPF series of
polypropylene capacitors for
ac applications feature the
company’s Fuseac technology to protect the capacitors
against fault conditions. An
internal fuse electrically disconnects when the capacitor’s
hot spot reaches a defined
temperature and prevents
deforming of the case.
These capacitors feature
dry film construction and
come in cylindrical cans
with radial terminals and a
mounting bolt. Capacitance
ranges from 10 µF to 250 µF
with standard tolerances of
±3% and ±5%.
AC working voltage ratings at 85C are 300 Vac, 600
Vac and 900 Vac at 60 Hz.
Operation is specified over
the -40°C to +85°C range.
Electronic Concepts
Eatontown, N.J.
www.electronicconcepts.com
Tantalum Capacitors
AVX’s TPM Series now
includes D and low-profile Y
case-sized multi-anode, mirror-configuration tantalum
capacitors. The symmetrical
design reduces the ESL to
1 nH, half that of standard D
case-sized devices. The low
www.powerelectronics.com
AVX
Myrtle Beach, S.C.
www.avx.com
High-Power Resistors
From IMS, the N-Series
of high-power resistors and
terminations on AlN offers
unmatched power handling
and flexibility in meeting specific circuit requirements.
The N-Series is available
in cases 0505 to 3725, thicknesses 0.015 in., 0.025 in. or
0.040 in., and multiple termination styles, including single
wrap to groundpad, center
stripe, extended wrap or
single sided with backplane
for added power dissipation.
Standard resistance range
is 10 V to 2 kV with tolerances to 2%. N-Series resistors
and terminations are available with RoHS-compliant
platinum silver, pre-tinned
platinum silver or wirebondable gold terminals,
making them ideal for any
application operating above
10 W.
IMS
Portsmouth, R.I.
www.ims-resistors.com
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Power Electronics Technology
www.epcos.com
April 2008
Spotlight on Passives
Charging Resistors
From Epcos, the J20X series of charg-
ing resistors employ a PTC ceramic
construction that enables them to be selfprotecting despite their small size. The
family consists of three products — the
J201, J202 and J204 products — whose
specifications are listed in the table.
These resistors overcome a key limitation
of ohmic resistors that are typically used
to limit current when charging capacitors. Those resistors can fail if the capacitor short circuits or a relay malfunctions
when short circuiting the capacitor.
These faults can subject ohmic resistors
to fatally high power levels.
In contrast, when the J20X series
of resistors is subjected to a fault, the
temperature and inherent resistance of
the PTC ceramic increases in line with
the increased ohmic losses and limits the
current to a safe level. Typical applications include industrial power supplies,
frequency converters and UPS systems
in the power range from 500 W to
50 kW. In such applications, a link-circuit
capacitor is used to smooth the generated dc voltage or as an energy-storage
device in the link circuit. Unit pricing is
approximately $2.35 each in quantities
up to 5000.
Model
VMAX (V)
RR (Ω)
J201
550
20 ±30%
J202
650
56 ±30%
J204
800
100 ±25%
TT electronics IRC
Corpus Christi, Texas
www.irctt.com
Military SMPS Stacked Capacitors
KEMET’s military-grade ceramic
stacked capacitors are intended for
high-reliability switch-mode power supply and pulse-energy applications. The
SMPS Stacked Capacitors are qualified
to Military Performance Specification
MIL-PRF-49470 and DSCC Drawing
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Epcos
Munich, Germany
www.epcos.com
Precision Surface-Mount Resistors
TT electronics IRC’s PPC Series combines the precision of a thin-film resistor
with the power-handling capabilitiess
of a thick-film resistor. The component
merges the high-surge capability (up
to 1500 W for 1 ms) of IRC’s CHP
Series with tolerances to 0.1% at TCRs
of 25 ppm/°C.
Available in 1206, 2010, 2512 and
3610 package sizes, the cylindrical surface-mount PPC Series resistor features
maximum power ratings of 1/8 W, 1/2 W,
1 W and 2 W, with working voltages of
200 V, 300 V, 350 V and 500 V, respectively. Resistance ranges from 100 Ω to
10 kΩ, with tolerances down to ±0.1%
and TCRs of ±25 ppm/°C.
www.powerelectronics.com
87106. Their low ESR and ESL make
them ideally suited for input and output
filtering of power-supply applications as
well as snubber applications.
The capacitors are available in case
codes 3, 4 and 5 (larger case codes 1, 2
and 6 will be available in the third quarter
of this year), X7R dielectric, and voltage
ratings from 50 Vdc up to 500 Vdc, and
capacitance values up to 47 µF. The chip
stack is horizontal and the leadframe
attachment is a high-temperature solder.
They are also available in unencapsulated
(unpotted bare chips) or encapsulated
(potted assembly) styles.
With an operating temperature range
between -55°C and 125°C, and with capacitance shift limited to ±15% over that
range, the SMPS Stacked Capacitors are
an excellent choice for electrical applications, general-purpose applications and
high-frequency power-supply circuits.
KEMET
Greenville, S.C.
www.kemet.com PETech
Pricing for the PPC Series surface
mount precision power resistor starts at
$0.35 each in quantities of 2500. Lead
time is from stock to 8 weeks.
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Power Electronics Technology April 2008