Electronics Protection - September/October 2013 - (Page 19)
TVS Diode Arrays Provide Protection Against
ESD and Lightning-Induced Surges
Ferrite Suppressors Clear Interference
Littelfuse, Inc. has introduced the SRDA3.3 series TVS
Diode Array – SPA Diodes.
The SRDA3.3 series integrates
low-capacitance steering diodes
with an additional zener diode
to protect data lines against
electrostatic discharge (ESD) and
high surge events.
The SRDA3.3 Series devices provide 40 percent greater protection without performance degradation. With up to 600 W of power
dissipation, these devices outperform similar market solutions by
20 percent in power handling capability. In addition, the low loading capacitance of 10 pF (max) of the SRDA3.3 series is 50 percent
lower than other solutions, which makes it well suited for protecting
telecommunications interfaces without sacrificing signal integrity.
Applications include tertiary (IC side) protection of high-speed
T1/E1/T3/E3 telecommunications data lines, xDSL interfaces, RS232/RS-485 interfaces, 10/100 Ethernet interfaces and video lines.
“The SRDA3.3 series surge, power dissipation and ESD performance, gives circuit design engineers a simple way to provide
greater overhead against electrical threats as defined by industry
standards,” said Chad Marak, director of the TVS Diode Arrays
product line, Littlefuse, Inc.. “The low dynamic resistance of these
devices ensures very low clamping voltages, which helps protect
today’s increasingly sensitive chipsets from premature failure.”
Enhanced DC LISN from Teseq Measures
Disturbances at Higher Current
Teseq is offering a high current
impedance stabilization network
(LISN) for measuring conducted
emissions disturbances on DC
power ports of photovoltaic (PV)
inverters. The DC-LISN-M2-100,
which conforms to the latest
requirements of the international
standard working group MT GCPC (grid connected power conditioners), can run at a maximum operating current of 150 A for 30
minutes, or continuously at 100 A.
This enhanced unit offers a maximum operating voltage of
1,500 V and measures disturbances over a frequency range of 150
kHz to 30 MHz. The DC-LISN-M2-100 provides improved performance, testing with impedance levels of 150 Ohms in commonmode and 100 Ohms in differential-mode.
Research results have shown that a typical artificial mains V-network as described in CISPR 16-1-2 cannot be used for the assessment of unsymmetrical disturbances of a photovoltaic inverter’s
DC port. CDNs based on IEC/EN 61000-4-6 are typically not
specified for high common-mode currents or differential-mode
disturbances. Additionally, depending on the switch position, the
LISN works as V, Y or Delta shape as well as offers a defined termination impedance from 1 kHz to 30 MHz.
The front panel of the DC-LISN-M2-100 includes an earth plane
connection bar, an EUT port, a switch for selecting the LISN type, as
well as a receiver port. The back of the DC-LISN-M2-100 features a
power input with selectable ranges of 230 V or 110 V for the unit’s
two cooling fans (also located on the back panel), an EUT power
input for a PV generator/simulator and a protective earth connection. An optional calibration kit is available for this unit.
On a daily basis, there
are millions of electronic
devices that operate in close
proximity on a very narrow
portion of the wireless communications spectrum that
spans from 30 Hz to 300 GHz.
Due to antenna size, power,
range, cost constraints and
FCC regulations, most of our personal electronics crowd an even a
smaller portion of that spectrum (5 GHz and below). Therefore any
uncontrolled electromagnetic radiation in this frequency range can
interfere with the normal operation of your electronic device.
Control of electromagnetic and radio frequency interference
(EMI/RFI) is a major engineering concern for all electronics manufacturers. Unfortunately, many of these problems are not known
until the costly, testing stage of development. In many instances, it
is discovered that a data cable or even power cord is acting as an
antenna, causing unacceptable levels of interference to spill into
One of the easiest and most cost-effective solutions for this
type of shielding problem is to attach a ferrite suppressor to the
origination and/or termination ends of cables. Bisected FerriShield
Ferrites from Leader Tech are available in an assortment of styles
and sizes and can quickly be snapped onto a cable that has already
been terminated. The company offers hundreds of frequency-specific ferrite solutions for both round and flat cables. As an added
advantage, Leader Tech maintains a massive inventory of Ferrishield
Ferrites for immediate delivery.
October 29-31, 2013
TD Convention Center
WORKFORCE | TECHNOLOGY | MANUFACTURING
Southeast manufacturing is revitalizing the U.S.
economy and the industry experts who exhibit at
SOUTH-TEC are leading the charge. Featuring
state-of-the-art suppliers, distributors and
equipment builders, you’ll ﬁnd all the manufacturing
products and services you need to help your
business grow. SOUTH-TEC is the single best
source to build your manufacturing momentum.
8364_SouthtecAd_ME 1/4 pg.indd 1
OFFICIAL MEDIA PARTNER
© SME 2013_8364
6/14/13 7:32 AM
Table of Contents for the Digital Edition of Electronics Protection - September/October 2013
Geist Unveils Rapid Deployment Data Center Environmental Monitoring System
Enabling Effective Thermal Management with DCIM
Predicting Gasket Performance: SE Measurements with a TEM Cell to Study Gasket Reliability
Rack Containment 101
The Nine Core Elements of DCIM
Using Electronic Locking Solutions to Secure Enclosures and Meet Storage Compliance Needs
Hammond’s HJ Series Ticks All the Boxes
Rogers Introduces Poron SlimGrip Foam
Ferrite Suppressors Clear Interference
Fujipoly Thermal Sheets are a Cooling Influence on LED Lighting
GE Introduces TLE Series UPS Platform
Gore PolyVent XL Improves Reliability of Large Outdoor Enclosures
IMI Sensors Launches Linear Adjust Mechanical Vibration Switch
Calendar of Events
Five Ways to Realize Server Room Profitability
Electronics Protection - September/October 2013