DES PLAINES, IL -- May 6, 2008 -
Littelfuse, Inc. (NASDAQ/NGS:LFUS) today
introduced the EV Series - Enhanced Version Teccor brand
Thyristors. These thyristors feature a minimum rated
blocking voltage (Vdrm/Vrrm) of up to 800 V, a maximum
turn-on time (tq) as low as 25 µs, and a minimum rated
static dv/dt of up to 75 V/µs - a five times improvement
over earlier thyristors of this type.
The high
blocking voltage and dv/dt immunity are attractive to
designers creating circuits for high-stress and/or high-reliability
applications. These features help a triac to better
survive transient voltages, minimize false triggering,
and prevent unstable activation. For example, one of
the more common failure mechanisms in thyristors is
a permanent short caused by a transient that exceeds
the dv/dt rating.
In addition to being more
robust, this feature helps prevent excess energy from
being passed to the circuit or load being protected.
Fast turn-on time is important in applications such
as ground fault circuit interruption, where it helps
ensure proper operation of the associated electromechanical
breaker.
Reduced Component Count
The enhanced switching characteristics
of the EV Series also minimize the need for extra components
for circuit protection. To compensate for lower dv/dt,
designers previously had to resort to the use of snubber
circuits, typically by adding resistance and capacitance
across the main terminals of the triac or SCR. These
can now be eliminated in many applications.
Suggested applications include fault detection circuits,
such as Ground Fault Circuit Interrupt (GFCI), Arc Fault
Circuit Interrupt (AFCI), Appliance Leakage Current
Interrupt (ALCI), Leakage Current Detection Interrupt
(LCDI), etc. The new thyristors also offer advantages
in direct spark igniter circuits (flame ignition), white
goods control boards (solenoid, valve, pump, and heater
controls) and small appliances (small motor and heating
controls).
The new EV Series of thyristors includes
four families:
The 0.8 amp families are suitable for
most applications, while the 1.5 amp families are for
applications with higher current and/or thermal demands.
The newly released products come in a full range
of gate sensitivities and industry standard packaging
variations, and are pin-to-pin compatible with popular
models already in use. They are RoHS (Restrictions On
Hazardous Substances) compliant.
Availability
Samples are available immediately. Typical lead time
for production quantities is eight to ten weeks, although
aggressive customer lead time expectations can be accommodated.
Additional Information For additional
information, please visit
http://www.littelfuse.com, or contact an
authorized products distributor or the Littelfuse Technical
Support line at 1-800-999-9445.
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About Littelfuse As the worldwide
leader in circuit protection products and solutions
with annual sales of $536.1 million in 2007, the Littelfuse
portfolio is backed by industry leading technical support,
design and manufacturing expertise. Littelfuse products
are vital components in virtually every product that
uses electrical energy, including automobiles, computers,
consumer electronics, handheld devices, industrial equipment,
and telecom/datacom circuits. Littelfuse offers Teccor®,
Wickmann® and Pudenz® brand circuit protection products.
In addition to its Des Plaines, Illinois, world headquarters,
Littelfuse has sales, distribution, manufacturing and
engineering facilities in Brazil, China, England, Germany,
Hong Kong, India, Ireland, Japan, Korea, Mexico, the
Netherlands, the Philippines, Singapore, Taiwan and
the U.S. For more information, please visit Littelfuse's
web site at
www.littelfuse.com.
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