 11/01
AC/DC Converter Provides Regulated
DC Output Without a Transformer
San Diego, California - ROHM Electronics,
announced the introduction of the BP5038 series of power
modules, which provide regulated 5V, 12V and
24V DC output without using a transformer. The form factor
of the 4-pin SIP package is only 18 by 16.8 by 9.1 mm,
reducing
the footprint by a factor of 4 and the weight by a factor
of 30 compared to a transformer-based power supply. Since
no transformer is used, the power supply board is less
vulnerable
to splitting and cracking from impact or shock. The new hybrid
device handles a wide range of input voltages, from 80
to
120 Vrms for AC voltage conversion. It provides a simple
and inexpensive power supply for gas and smoke alarms,
DC motors,
sensors, microcomputers, relays, LEDs, vacuum cleaners, air
conditioners, air purifiers, humidifiers, dehumidifiers,
lighting
devices and other electronic devices.
One of Rohm's chief advantages in the
DC converter market is that it makes nearly all of the components
used in the device, such as resistors and switching diodes.
"The fact that we produce nearly all the components for
the device eliminates supplier margins and helps us deliver
the product at an extremely competitive price without worries
about supply chain disruptions," said Mark Dorais, Product
Engineer for Rohm. "The fact this is a hybrid device
also lowers assembly cost by reducing the need for discrete
components.
"The new hybrid regulator makes
it possible to configure a DC power supply with just a few
external components
that are relatively inexpensive and small in size. Conventional
regulators require large smoothing capacitors and a heat
sink
while the new Rohm device uses tiny capacitors and does not
require a heat sink. Rectifying diodes selected for uses
with
the new converter have a reverse voltage rating of 400V or
higher, average rectifying current of 0.5A or higher and
forward
surge current of 20A or higher. using a larger capacitor
for input voltage smoothing produces a more stable output
voltage,
but increases the surge current when the power supply is
turned on.
The capacitor should be able to withstand
peak voltages
of at least 200V. The capacitor used for output voltage smoothing
should have a low effective series resistance. Capacitors
designed for low-impedance switching power supplies are especially
suitable.Samples of these products are currently available.
Pricing starts at $1.39 each in quantity of 1000. Delivery
is 8-12 weeks ARO.ROHM, the world's largest component-only
manufacturer was founded in 1958 in Kyoto, Japan. ROHM designs
and manufactures integrated circuits and other electronic
components including monolithic ICs, power modules, photo
link modules, transistors, diodes, LEDs, LCDs, Laser diodes,
thermal heads, image sensor heads, and LED displays. By building
its manufacturing equipment in-house, developing highly
automated
production methods, and pioneering in advanced environmental friendly productions, ROHM has become a key player in custom
LSI, and other semiconductor products.
 11/01
New ROHM Transient Voltage
Suppression Diodes Provide ESD ProtectionSan Diego, California - ROHM
Electronics, the world's largest diode supplier, has introduced
two new transient voltage suppression (TVS) diodes (RSA 6.1EN
and RSB6.8S) designed to provide noise suppression on a signal
line to protect against electrostatic discharge (ESD). These
new silicon epitaxial planar construction devices are offered
in small packages (UMD5 and EMD2 respectively) designed specifically
for surface mount applications. The new diodes offer stronger
resistance to surge than ceramic capacitors and less clamping
heat. Their low clamping factor and picosecond response time
clamps transient pulses early and maintains them at an acceptable
level for their entire duration.
Today's miniaturized electronics are
increasingly susceptible to damage from voltage transients.
When no problems exist, Rohm TVS diodes are basically invisible
to the circuit they are protecting. They remain in a low-leakage,
unbiased state presenting effectively no load to the circuit
as long as the applied voltage is at or below the critical
value. A transient voltage exceeding this value, typically
caused by ESD, will cause the device to avalanche, beginning
the clamping action across the lines to which it is connected.
TVS diodes maintain the transient pulses at an acceptable
level for their entire duration.
The RSA 6.1EN includes four diodes in
a single 2 mm wide by 1.25 mm deep by 0.9 mm high package
(UMD5) with a common anode configuration. The RSA 6.1EN has
a zener voltage rating of 6.10 minimum and 7.20 maximum at
1 mA. Maximum power dissipation is rated at 200 mW, maximum
junction temperature of 150°C and a typical junction capacitance
of 90 pF and storage temperature between -55°C and 150°C.
The device is rated for a maximum reverse current of 1 mA,
forward current of 1.25V and an absolute maximum peak power
of 30W for 1000 ms or 200W for 20 ms.
The RSB6.8S comes in a tiny 0.8 mm wide
by 1.2 mm deep by 0.6 mm high package (EMD2). This device
has a zener voltage rating of between 5.780 and 7.820 volts
at 0.5 mA, a maximum reverse current of 1 mA and a typical
junction capacitance of 30 pF. Absolute maximum ratings are
10W peak power, 150 mW power dissipation, and 150°C junction
temperature. Both storage temperature and operating temperature
are rated at between -55°C and 150°C.
11/01
ROHM Introduces High Precision Tolerance
Thick Film Resistors in 0402 and 0603 Packages
San Diego, California - ROHM
Electronics has introduced a new line of 0.5% tolerance thick
film resistors in 0402 (1005 size) and 0603 (1608 size) rectangular
packages for the most demanding high-precision applications.
The accuracy of the resistors is tested under JIS C 5201-1
4.5 standards in order to assure high enough accuracy for
nearly any critical requirement. The thick film makes the
electrodes very strong, preventing damage during soldering.
The new 0402 package resistor is especially small and light,
with an area that is 60% smaller and a weight that is 75%
lighter than the 0603 package resistor.
The compactness of the 0402 package
resistors makes them perfect for use in portable electronic
equipment such as cellular telephones, personal digital assistants
and portable entertainment systems. External dimensions of
the 0402 package resistors are only 1.0 mm wide, 0.5 mm deep
and 0.35 mm high. External dimension of the new 0603 package
resistors are 1.6 mm wide, 0.8 mm deep and 0.45 mm high. The
flat top of both size resistors assures positive fit in face
down mounting. Both resistors are available on recyclable
reels, on tape or in bulk cases.
The Ruthenium oxide dielectric used
in the new resistors provides superior resistance to the elements,
delivering exceptionally high reliability. The 1608 size resistors
also have a resin protection coating that absorbs impact to
prevent damage in automated assembly. The new resistors have
a voltage rating of 50V and a power rating of 0.063 watt at
70°C. They are designed to operate at -55°C to +125°C.
They have been tested under JIC C 5201 to provide guaranteed
values for variation of resistance with temperature, overload,
solderability, resistance to soldering heat, rapid change
of temperature, endurance, resistance to solvent and bend
strength.
By building key manufacturing equipment
in-house and developing highly automated production methods,
ROHM has become the world's largest supplier of resistors.
ROHM has six production facilities located throughout the
world. World class manufacturing quality, lower prices, fast
delivery and a continuous supply to virtually any location
in the world are among the key advantages of ROHM resistors.
 10/01
ROHM Introduces Small, High-Capacity
Tantalum Capacitors for Portable Equipment
San Diego, California -
ROHM Electronics, has introduced a new line of very small
yet high capacitance Tantalum Capacitors, TC Series. Designed
specially for use in portable electronic equipment. These
low impedance devices are ideal for low voltage digital circuits
used in cellular telephones. The new capacitors are offered
in A and P-cases. External dimensions of the P-case are only
2.0 mm long, 1.25 mm wide and 1.2 mm high. Dimensions of the
A-case are 3.2 mm long 1.6 mm wide and 1.6 mm high.
The new capacitors carry capacitance
values ranging from 1µF to 47 µF and have rated
voltages ranging from 4V.DC to 20V.DC. They are available
with ±10% and ±20% capacitance tolerance. The
new capacitors are offered on 8 mm tape 180 mm ET-7200A compatible
reels for use on automated assembly lines. External electrodes
are coated with eutectic solder, making this product ideal
for solder mounting. The operating temperature of the new
capacitors is -55°C to +125°C.
The new capacitors are designed to withstand
a shear force of 5 Newtons with no mechanical damage to the
capacitor. They are designed for capacitance to remain in
tolerance after application of a force that causes the capacitor
to bend by 1 mm for 5 seconds. These new capacitors voltage
derate at 125°C ranges from 2.5VDC to 20VDC. The impedance
of the new TC series does not increase after soldering because
of the heat resistance of the silver paste.
5/01
ROHM Introduces the IA3008-CA10 New
Letter-Size 300 DPI Full-Color Image Sensor
San Diego, California - ROHM
Electronics has introduced the IA3008-CA10 New Letter-Size
300 dpi full-color image sensor for color sheet-fed scanners,
and multi-function scanner/printers. By using its LSI design
and thermal head mounting technologies, ROHM has designed
a very small and lightweight full color image sensor (size:
224W18 mm W 12 mm, weight: 65 g).
ROHM has focused its efforts on developing
this innovative miniature image sensor by employing its expertise
in three areas: driver LSI circuit design, high-density mounting
technology, and assembly techniques. This new development
follows last year's release of the full color image sensor
for fax machines. This new product was developed in response
to the convergence of new technology and to manufacturers'
needs for advanced components for personal computers and lightweight
portable data terminals.
The specific features include:
1. Internal amplifier in each sensor IC operates off single
power supply (5V) for superior noise resistance.
2. LED chips provide three-color (RGB) light source for superior
color reproduction.
3. Unique ROHM prism that allows for short focal lengths within
the head.
4. Innovative prism structure that reduces prism height.
5. Ceramic substrate for superior temperature characteristic,
which improves optical characteristics.
ROHM recognizes that printheads and
scan heads are key components in the multimedia and information
technologies, and has focused development on advanced products
for a broad spectrum of applications, including facsimile
machines, label printers, ticket-vending machines, and card
printers.
ROHM Electronics supplies a wide
range of ASICs, gate arrays, standard cell custom ICs, industry-standard
analog and logic ICs, and hybrid circuits, as well as discrete
semiconductors. ROHM Electronics also offers a full line of
LEDs, LCDs, Laser Diodes, and passive components.
3/01
ROHM Introduces BU8763FV & BU8766FV
Melody IC For Cellular Phones
San Diego, California
- ROHM Electronics has introduced the "MIDI" BU8763FV
and BU8766FV 3-frequency tone generator ICs. These new ICs
were
designed for cellular phones, games and PCs. Enabling cellular
phones with music ringer options, by selecting pre-installed
or download from web ringer music, delivering messages with
music, change the ringer music as the caller-ID or for personal
and seasonal occasions.
With the increasing demand for new innovative
ideas for cellular phones, ROHM's new product, BU8763FV and
BU8766FV can fulfill customers' demands by generating 3 frequency
tones simultaneously. Tone and volume in each sound source
can be controlled separately by serial control. Output is
generated from sine wave and special square wave. The sine
wave is a waveform driving the speaker amplifier with 3 sine
waves with different frequencies provides low sound pressure.
The special square wave is a waveform that can generate sound
pressure.
The specific features include:
1. Tone frequency: 110Hz (low A) ~ 4186Hz (high C)
2. Fade in, fade out with envelope curve
3. 9 bit DAC
4. Built-in LPF for Smoothing (fc=20KHz)
5. 3-wire serial interface
6. Voltage 2.7V ~ 3.6V
While satisfying manufacturers and customers'
great demands for cellular phone products, ROHM's is also
continuing its resources for innovative ideas for new enabling
technologies that deliver the ever increasing sophisticated
electronic needs of consumers and businesses worldwide.
ROHM Electronics supplies a wide range
of ASICs, gate arrays, standard cell custom ICs, industry-standard
analog and logic ICs, and hybrid circuits, as well as discrete
semiconductors. ROHM Electronics also offers a full line
of LEDs, LCDs,
Laser Diodes, and passive components.
3/01
Rohm,
Future Agree to Widen Distribution
Semiconductor manufacturer, Rohm
Electronics, San Diego, CA, and components distributor Future
Electronics, Pointe Claire, QC, reached an exclusive agreement
covering the Americas, which follows a North American relationship
between both firms since 1995.
Rohm manufacturers power modules, LCDs,
passive components, custom LSI assemblies and discrete semiconductor
devices such as diodes, LEDs and transistors. Design-in services
performed by Future are seen as important to the manufacturer's
plans for expansion of market-share.
"Improving service to all our customers
in the Americas is a constant challenge at Rohm," says
Ken Sykes, senior vice-president, eastern sales division." One
way to do that is to make it easier for the customers, especially
the emerging and growing customers, to design-in
and purchase Rohm products."
3/01
ROHM Announces Transistors in a VMT3
Package with a 44% Smaller Mounting Area
San Diego, California - ROHM has announced the availability
of small signal bipolar transistors in VMT3 packages that
are 44% smaller in mounting area and 30% smaller in height
than ROHM's previously available transistors. The new line
includes 37 different devices including both conventional
bipolar transistors and digital transistors that incorporate
one or two resistors, providing additional space savings.
The small size of these discrete devices makes them ideal
for use in portable devices such as cellular phones, Internet
appliances, personal digital assistants, pagers, etc. ROHM
is the largest producer of discrete transistors in the world,
making it possible to provide these devices on a very cost-efficient
basis.
While most functionality in portable devices is provided by
integrated circuits, the majority requires a number of discrete
transistors to provide miscellaneous functionality, such as
converting from 3V to 5V logic. The tight space required in
these devices often means that their designers configure hybrids
with bare dies. The problem with this approach is that assembly
costs are increased by the need for wire bonding and other
additional, often manual, assembly operations. Up to now,
designers had to make a hard choice between the additional
costs involved in this approach and the extra space required
to use conventional discrete components.
ROHM's new bipolar transistors provide the best of both of
these worlds by offering NPN and PNP bipolar and digital transistors
in a package that takes up not much more than the same space
as a bare die ¾ when you consider the additional space required
for wire bonding. The VMT3 package has a mounting area of
1.2 by 1.2 mm and a height of 0.5 mm, compared to a 1.6 X
1.6 mm mounting area and 0.7 mm height for previous small
signal bipolar transistors in EMT3 packages. Typical applications
of the digital transistors include driving external circuits
with on-off signals. Some have a single resistor in series
with the base while the others have that resistor plus another
between the base and emitter. In this second example, one
of the new devices can replace three traditional components.
Resistor values range from 4.7 KW to 100 KW.
 2/01
Single-Chip Wireless IC Leverages
Audio in Conventional FM Receiver
San Diego, California-
ROHM Electronics has announced the first single-chip wireless
IC that enables portable devices to take advantage of the
audio system in a conventional FM receiver. MP3 players,
portable
CD players, personal digital assistants, video game players,
cell phones and other devices can be connected to a more
powerful
audio system without the need for cables or even a line of
sight connection. The receiver is simply tuned to the same
frequency as the audio link IC and the audio generated
by
the portable device is played by the higher-quality audio
system. This new device incorporates a stereo modulator,
frequency
synthesizer and high frequency transmitter onto a single
IC, replacing the three chips that were previously required
to
achieve this functionality.
Applications of the new device are limited only by the designer's
imagination. An MP3 player could broadcast onto a home stereo
system, dramatically improving the power and quality of the
output. A portable CD player could be connected to a portable
stereo. A car stereo system could be used as the audio system
for a video game player. In each of these cases, no cables
or physical connections are required. The FM receiver is simply
tuned to the same frequency that the wireless link IC is transmitting
on. Other devices that could benefit from this IC include
navigation systems, personal computers, fax machines, and
many others.
In the past, enabling these features required a number of
components such as ROHM's BA1404/BA1405 stereo modulator
IC,
BU26511A phase lock loop frequency synthesizer IC, a RF oscillator
circuit and various high frequency circuits. Designing the
wireless link required a considerable amount of time and
expertise
and the attachment of multiple external components to improve
sound quality. Now, ROHM has incorporated all of this functionality
onto a single BiCMOS IC, greatly reducing design time and
the required board real estate. The board footprint is reduced
by more than half compared to conventional two-chip formats
and the number of external parts is reduced by about 60%.
The new wireless audio link ICs come in three styles, BH1414K,
BH1415S/F and BH1416S/F. The first IC allows the transmission
frequency as well as the input level setting, monaural operation
and output on-off to be changed with a serial data link from
a microprocessor. The second IC allows the transmission frequency
to be controlled through the serial data link. The third
IC
omits the serial data link, but the transmission frequency
can be controlled through a X4 DIP switch array. |
