About
The Company
Can I purchase product or request samples
directly from the website?
Does Murata show every part number they
make in their catalogs or on the web page?
How do I find out about employment opportunities
at Murata?
When did Murata start using Global Part
Numbers?
Who is Murata's authorized distributor?
Top of Page
Ceramic
Capacitors
How are EIA temperature codes defined and
what do they mean?
What is a X capacitor?
What is a Y capacitor?
What
is the allowable ripple current Murata's ceramic capacitors can withstand?
Can
I use Murata capacitors in an AC circuit?
What
is insulation resistance?
What
is DC bias characteristic?
What
is aging in capacitance
What
is the application difference between automotive grade (GCM) and standard
grade (GRM)capacitors?
What
conditions should I store chip capacitors?
Top of Page
High
Frequency Devices
How does Murata specify Insertion Loss
and Ripple for their high frequency dielectric filters?
What VCO frequencies are available?
Will Murata consider custom design requests
for SAW filters?
Top of Page
Inductors
What are the EIA case sizes offered by
Murata for surface mount inductors?
What are the three manufacturing technologies
of Chip Inductors?
Top of Page
Low
Temperature Cofired Ceramics (LTCC)
What is LTCC?
Top of Page
Multilayer
Devices
What is a delayline?
What is an LC filter?
What is the difference between your current
antenna technologies?
Top of Page
Resistive/Thermistors
What is a carbon resistive element?
What is a cermet resistive element?
What is themeaning of temperature coefficient
(TC) of resistance (ppm/0C)?
Top of Page
Resonators
Are the CST and CSTCC series resonators
polarized?
How do I insure a Murata ceramic resonator
will work with an IC I am using for my design
What is a resonator?
Top of Page
About The Company
Can I purchase product or request
samples directly from the website?
Murata Electronics Singapore does not
offer the ability to request samples or purchase products directly from
our website at this time. Our sales channel network of authorized Distributors
and Sales Representatives can assist with either of these requests as well
as obtaining quotations and checking product inventory.
Does Murata show every part
number they make in their catalogs or on the web page?
No, Murata (and other suppliers)
have various stages of product development and design reviews prior to
releasing a product to mass production. Also, many products (such as microwave
filters, VCO's, Sensors, etc.) are very custom in nature to meet specific
needs of the customers' design. For these reasons, it is not always possible
or practical to show all possible part numbers in catalogs or on our web
page.
Here is a general rule to follow when you cannot find an exact product
or part number in one of our catalogs or on our web page. If your specification
and need is similar to an existing part number or product offered by Murata,
then define your need to one of Murata's authorized Distributors or Sales
Representatives, or send us your technical question by fill up a inquiry
form to us. It is always best to refer to one of our existing products
or specifications and then show the different specification you require
and ask us to review and consider if we can supply to meet your need. Often,
you might be surprised to find that we already have an existing part number
or near future planned release of a newly created design that could meet
your needs. If not, we will then consider the potential for us to design
a new product to meet your need. If we cannot meet your need, then we will
tell you clearly the best or closest option in our product portfolio for
you to consider.
How do I find out about employment
opportunities at Murata?
Murata Electronics Singapore (Pte.)
Ltd. posts specific positions available within our company in our Career site.
When did Murata start using
Global Part Numbers?
The New Global Part Numbers went into
effect June, 2001.
Who
is Murata's authorized distributor?
Please refer to Distributors
list
Please go to the Contact
Us page to know more about this.
Top of Page
Ceramic Capacitors
How
are EIA temperature codes defined and what do they mean?
EIA (Electronic Industry Alliance) has
established a 3-character code which describe the capacitance versus temperature
performance for capacitors. For high dielectric constant types (EIA Class
II and III), the first two digits designate the operating temperature range.
The third digit designates the capacitance change over the operating temperature
range. The following describes the coding system used:
What
is a X capacitor?
This is used to define safety approved
capacitors where failure in the circuit will not lead to electrical shock.
For example, a capacitor connected between the AC power lines to reduce
normal mode noise in a circuit. (UL and CSA refer to this application as
"Across-the-line noise").
What
is a Y capacitor?
This is used to describe safety approved
capacitors whose failure in a circuit will present danger of electrical
shock. For example, a capacitor connected between the AC power line and
the ground conductor in a circuit to reduce common mode noise. (UL and
CSA refer to this a "Line-by-pass noise"). The capacitance is
limited up to 4700pF so leakage current can be controlled.
Top of Page
High Frequency Devices
How does Murata specify Insertion
Loss and Ripple for their high frequency dielectric filters?
For many of Murata's high frequency
filters, be it ceramic block, SAW, or multilayer ceramic, Murata specifies
I.L. over the specified pass band relative to 0dB reference level. This
differs from many engineer's description of I.L. which is typically thought
of as being the minimum loss point in the filter's response curve. Murata's
specified maximum I.L. typically occurs at the end of the specified pass
band width. Murata then specifies ripple as the difference between the
maximum and minimum I.L. points. An example of this I.L. and ripple can
be seen in the following graph which shows an 836 MHz center frequency
filter that has a pass band range of 824 to 849 MHz.
What
VCO frequencies are available?
Please refer to the Murata
PDF Catalog Library or look in
our Products
section. If you cannot locate the required frequencies, please contact
our sales representatives with the desired size, center frequency, specific
application, and estimated annual usage
Will
Murata consider custom design requests for SAW filters?
Due to the overwhelming demand for Murata
SAW devices, Murata is concentrating its design efforts to filters used
in the major wireless markets such as digital cellular, etc. However, if
you have an opportunity that would exceed an annual use of more than 100,000
pieces in an emerging or established application, please provide your detail
requirements to a Murata representative or authorized distributor. Your
request, and the market it applies to, will be reviewed by Murata and a
decision made as to whether we already have a similar design to meet your
needs or a custom design can be developed.
Top of Page
Inductors
What are the EIA case sizes
offered by Murata for surface mount inductors?
The Electronic Industry Association
(EIA) has established case size standards for chip inductors within the
market. Murata offers many of the different case
sizes for varying applications. The
following shows the conversion from the EIA standard to the Murata product
series: (Please reference Global PN notice / meaning below).
In an effort to unify and shorten part
numbers on a global basis, Murata Electronics has implemented a new part
numbering system (Global Part Number or GPN). While Murata is changing
the part numbers, the performance and specifications of the components
will remain the same. The global unification project began in June 2001.
Since there are several hundreds of thousands of part numbers on hand,
this new system requires a great deal of preparatory work and coordination
with Murata's overseas facilities. Please keep in mind that not all Murata's
customers have converted to the new Global Part Number. Until everyone
converts to the Global Part Numbering system please reference previous
part number structure as well as Global Part Numbering structure.
What
are the three manufacturing technologies of Chip Inductors?
Murata has three technologies of manufacturing
chip inductors: Monolithic, Thin Film, and Wire Wound. The reason for offering
three technologies is design flexibility. Each construction technology
has unique features that provide a wide range of characteristics suitable
for various applications.
Monolithic Inductors consist of an integrated
multilayered process that is available with a ferrite or ceramic structure.
The ferrite structure is suited for lower frequency applications and the
ceramic structure is designed to meet the demands of higher frequency circuits.
Both structures are available in small case sizes and are cost effective.
Thin Film inductors are manufactured
using a photolithography process on a ceramic / glass substrate, which
produces a highly accurate coil pattern. The process achieves tight tolerance,
compact size, and minimizes stray capacitance making these inductors ideal
for high frequency circuits.
Wire Wound inductors consist of copper
wire wound on a ferrite or alumina bobbin. As with the monolithic structure,
the ferrite bobbin is suited for lower frequency applications, while the
alumina is suited for high frequency applications. As this technology utilizes
an actual wire for winding, the Q value is high and the DC resistance is
lower enabling higher rated current.
Top of Page
Low Temperature Cofired
Ceramics (LTCC)
What is LTCC?
A multilayer ceramic material and process
that allows the cofiring of multiple substrate layers with printed thick
film electrodes at temperatures of
approximately 1000 Deg. C. This process
combined with qualified design proficiency is utilized to create several
innovative products. These products
are a result of LTCC's ability to provide
tight tolerance geometry and pattern manipulation to yield high levels
of passive component integration and highly
integrated module designs.
Some Murata LTCC Product Examples introduced
over past 10 years:
-LC Filters
-Baluns
-Couplers
-Chip Antenna
-RF Diode Switches
-Highly Integrated Module (RF& Microwave
Receive / Transmit Modules)
The Basic Process:
Top of Page
Multilayer Devices
What is a delayline?
A delayline provides a constant time
differential without distortion between the input and the output of the
device. The time difference between In-put signal and Out-put signal is
the delay time.
Computer and digital signal designers
need to control the timing of signals between processing points. Delay
lines provide adjustment to signal speeds by creating a delay between two
points on the circuit board.
Delayline Functions:
-Signal propagation with delay time
-Temporary memory of Pulse and Analog
signal
-Temporary accumulation of energy
-Conversion and Coding of signal wave-form
Murata provides an electromagnetic and
passive delayline. Murata LDH series delay gets long delay time and matches
up uses at high frequency in the small SMD package by utilizing our advanced
ceramic and multilayer design technologies.
Application of delayline - Equipment
that utilize delay lines:
-Computer ( PC, Server, Work Station
)
-Game machine
-Factory Automation machine ( Touch
Panel, Controller )
-Plain Paper Copier ( Digital machine
)
-Digital Camera
-Video Camera
-LCD ( Driving circuit )
-Laser Printer
-Car navigation
-Collision prevention radar
-Wireless LAN
-Fiber Optics
-Microwave communication machine
-Wireless Base Station ( Cellular, Disaster
prevention wireless )
-Telephone Switch / Exchanger
-Measuring Equipment ( Oscilloscope,
Synthesizer, IC tester )
-Data storage
-Broadcasting Machine ( Camera, VTR,
Optical disc )
-Medical Machine
What
is an LC filter?
An LC filter is just that...a filter
made up of a combination of L's (inductance) and C's (capacitance). By
changing the combination, number, and value of L's and C's, several different
types of devices can be made. Just in the filter family, LC filters can
take several forms. Among these are bandpass filters (BPF), low pass filters
(LPF), high pass filters (HPF), and traps. These filters can even be packaged
in the same chip to make components such as diplexers (LPF and HPF) and
dual filters. Generally, LC filters are less costly and have good design
flexibility as compared to other filtering technologies.
What
is the difference between your current antenna technologies?
There are three major types of chip
antennas offered by Murata. The first is a multilayer chip antenna with
P/N starting "LDA". Basically, this is a linearly-polarized,
helical antenna manufactured by multilayer processes. Another type of chip
antenna offered by Murata is the dielectric antenna with P/N starting "ANC".
This type is a linearly-polarized, patch type antenna that is manufactured
by printing an antenna pattern on a ceramic block. These can be single
or dual resonant antennas. A subset of that family is the GPS patch antenna
that is circularly polarized for use in GPS (satellite) application, also
starting "ANC". Within these families, there are many variations
resulting in a wide variety of antenna solutions.
Top of Page
Resistive/Thermistors
What is a carbon resistive element?
Many of Murata potentiometer series
use carbon as the element of choice. This type of element uses either carbon
black or graphite as it's major resistive
materials. It is combined with phenol
resin, etc, via a binder, to form a resistive element. This type of element
produces one of the least expensive resistor and has been used in industry
the longest.
What
is a cermet resistive element?
This type of potentiometer uses a metallic
oxide as the major resistive material and is combined with a glassy binder.
This combination forms a resistive element that has a large load capacitance
with little drift producing a highly reliable resistor over a wide temperature
range
What
is the meaning of temperature coefficient (TC) of resistance (ppm/0C)?
It is a rate of change of the resistance
value expressed in units of parts per million (ppm) when the temperature
increases by 10C to a reference temperature. It is generally used as a
gauge to show the temperature stability of a resistive element (i.e.: cermet
is inherently more stable than carbon elements). It is expressed by the
following formula:
Temperature coefficient of resistance
(TC) = (R2-R1) / (R1*(t2-t1)) X 10<sup>6</sup>(ppm/0C)
Where:
t1 : Reference temperature expressed
by 0C.
t2 : Test temperature expressed by 0C.
R1 : Resistance value at the reference
temperature expressed in ohms.
R2 : Resistance value at the test temperature
expressed in ohms.
Top of Page
Resonators
Are the CST and CSTCC series
resonators polarized?
Theoretically, CST and CSTCC resonators
are basically the same regardless of direction. In practice, this is not
exactly the case. Murata does show the CST and CSTCC resonators with polarity
for the following two reasons: (1) in mass production of the ceramic resonator,
the resonator is only sorted in one polarity direction per specification.
(2) the two internal load capacitors ( of a given part sample ) are typically
not the exact same value (spec tolerance on value id +/-20% in most cases
). Assuming the two internal load caps are of slight different value within
tolerance, it is possible for the oscillation frequency to be slightly
different depending on which way the resonator is oriented in the circuit.
Due to this, using the ceramic resonator in the opposite polarity (as indicated
in the part specification) has some chance for the resulting initial oscillation
frequency not being within specification.
How do I insure a Murata ceramic
resonator will work with an IC I am using for my design?
To ensure stable oscillation between
the resonator and the IC, Murata recommends that customers take advantage
of the free IC Characterization process. With the differences in clock
circuits built into microcontrollers and the variation of ceramic resonators,
clock circuit design can be very time consuming. Murata's proven characterization
service takes this burden off design engineers, allowing them to focus
on other key items of their design. This service is free of charge.
To check to see if Murata has characterized
a particular IC in the past, check our "CERALOCK"
vs. IC parts search. If you have
additional questions, contact your local authorized Distributors or Sales
Representatives.
What
is a resonator?
A resonator is a passive device that
is used with the clock circuit of an IC to set the speed of the IC. The
resonator by itself is not a clock, so it must be used with circuitry built
into the IC to create the clock signal. Quartz crystals have been used
in this manner for many years, but Murata offers lower cost and more rugged
ceramic resonators. The clock circuit consists of the passive resonator,
quartz or ceramic, and an active amplifier that is built into the IC.
