Electronics Protection - Spring 2015 - (Page 24)
Bourns Expands High Voltage Power TVS
Product Line with Nine New Devices
Bourns, Inc. has expanded the company's
high voltage Power Transient Voltage Suppressor (PTVS) product line. Offering added
bidirectional port protection from 170 volts
to 430 volts, the nine PTVS devices are
designed to meet stringent IEC 61000-4-5
8/20 μs current surge requirements in a
broad variety of AC line and high-power DC
An advantage for customers is that PTVS
silicon-based technology delivers lower
clamping voltage under surge, greater performance stability and
increased reliability compared to the capabilities offered from
typical competing MOV technology. The Bourns PTVS products
also offer an additional surge response versus temperature; the
typical maximum surge current at 150°C exceeds 70 percent of
their rated value at 25°C.
Alpha and Omega Semiconductor's AlphaDFN
Family Enhances Mobile Battery Protection
Alpha and Omega Semiconductor Limited (AOS) has released
two MOSFETs optimized for battery protection applications. The
AOC2804 and AOC2806 are the
latest additions to the AlphaDFN
package portfolio. These devices are
specifically targeting one and two
cells portable battery pack applications such as those found in the
latest smart phones, tablets, media
players and wearable devices.
In mobile battery pack applications the protection MOSFET
controls charging and discharging of the battery, and is critical to
battery life and battery safety. The new generation of devices is
optimized with AOS's proprietary power trench technology, which
minimizes RSS (source- to-source resistance) in a common-drain
The AOC2804 (1.5 mm by 1.5 mm) is aimed at 22 m max RSS
level applications such as feature phones and wearable devices.
AOC2806, with slightly larger dimension at 1.7 mm by 1.7 mm, is a
18 m max RSS device that is best-suited for smart phones.
In addition to the silicon technology, the AOC2804 and
AOC2806 feature AOS's proprietary AlphaDFN packaging technology encapsulating silicon in a protective molding compound. The
resulting product still provides an ultra-thin 0.3 mm solution, while
providing a more robust structure to solve die chipping and placement issues associated with standard CSP products.
GE Adds to Extensive Line of Hammerhead
GE's Critical Power business has expanded its Hammerhead series of DC-DC modules with its 228 W quarter-brick QHHD019A0B
isolated DC-DC converters. The low-height modules provide a
single, precisely regulated output voltage over an ultra-wide input
voltage range of 18 to 75 volts DC.
These energy and space-efficient DC-DC converters enable
input power flexibility for board designers while providing a common building block that can support multiple sockets. In terms of
output voltage, GE's Hammerhead converters provide a nominal
Spring 2015 * www.ElectronicsProtectionMagazine.com
12-volt output voltage that is rated
for 19 amps output current. The
modules achieve typical full-load efficiencies of greater than 93 percent at
input voltages of 24 volts and 48 volts.
Standard features of GE's QHHD019A0B DC-DC converters include
remote on/off, remote sense,
output-voltage adjustment and over-voltage, over-current and
over-temperature protection. In addition, an optional heat plate
is available, which allows for an external, standard, quarter-brick
heat sink attachment.
With the addition of the 228-W QHHD DC-DC converters to its
family of Hammerhead products, GE is able to provide board designers with a wide range of offerings from 15 W in a 1 by 1-inch
module to 228 W in a DOSA-standard, quarter brick unit.
New Ultra-Small Fuse and Fuseholder
Combination from Schurter
Schurter has expanded its range of
surface mount fuses with the introduction
of the UMK 250 series. The UMK 250 is a
quick-action fuse according to IEC 601274, and complements the existing time-lag
series UMZ 250. The UMK 250 provides
primary and secondary overcurrent and
The UMK 250 is available in ten rated currents from 500 mA
to 4 A. This fuse and clip combination is designed for easy fuse
replacement. Rated for the protection of primary and secondary
PCB circuits, the UMK 250 is designed for applications including
lighting, power supplies, medical equipment, as well as consumer
and industrial devices.
This series is RoHS compliant and compatible with lead-free
soldering processes. The UMK 250 fuseholder is a substitute for
similar surface mount fuses, where the fuse clips are not offered.
The compatibility of the solder pads allows the Schurter product
to be used in cases where the ability to replace the fuse is desired.
The installed fuse-link UMF 250 is considered a Universal Modular
Fuse (UMF) and carries VDE and cURus approvals. This ultra-small
fuse including clip is 11.3 by 4.2 by 4.0 mm with a breaking capacity between 100 to 200 A at 250 VAC/125 VDC.
Emerson Network Power Introduces Liebert
Emerson Network Power has introduced the Liebert eXM UPS
system for small and medium power requirements. The 3-phase
UPS will be available in North America (including Canada), Central
America and Latin America in March in eight fixed capacities from
10 to 100 kVA/kW, in 208 V and 220 V.
The Energy Star qualified Liebert UPS delivers among the highest efficiency levels for midsize power applications. During double
conversion mode, the transformer-free Liebert eXM UPS delivers
95.4 percent efficiency. While in energy saving Eco-Mode, efficiency increases up to 98 percent. Customer savings of more than
$1,000 annually can be achieved for every efficiency percentage
point gained per 100 kW. In addition, the unity power factor design delivers the highest level of power capacity, reducing cabling
and installation costs and saving more than 30 percent in floor
space over comparable configured systems.
Optimized ancillaries add significant flexibility to meet dynamic IT environments. These include matching battery cabinets
Table of Contents for the Digital Edition of Electronics Protection - Spring 2015
Predictive Modeling: The Next Frontier in Data Center Condition Maintenance
Don't Forget the Batteries
Military Aircraft Power
Pumped Two Phase Cooling Solutions for Challenging Thermal Management Applications
Identifying the Ideal Mechanical PCB Hardware for Electronic Systems
Bridging the Technology Gap: The Importance of Cyber and Physical Security within the Data Center
Waterproof Mobile Device Protection without Compromising Acoustic Quality
Electronics Protection - Spring 2015