Bourns CHF12545CBF Selecting the right resistor for your application Datasheet

Bourns® Resistive Products
Selecting the Right Resistor for Your Application
Introduction
CR Series
CRT/CRL Series
CAT/CAY Series
4816P
CHF9838CNF Series
1/11 • e/N1064
Science and engineering students typically experiment with axial leaded resistors,
learning a color code to identify the resistor value based on the stripes around the resistor
body. In practice, however, axial leaded resistors are overshadowed in board fabrication
by resistors for which the construction, package styles, and materials are targeted for
specific applications.
Bourns offers a wide variety of resistive products that include devices that range from
industry standard size chip resistors to very high frequency (RF) power resistors in order
to meet today’s broad market requirements. There are many advantages to incorporating
Bourns® resistors into today’s designs including custom values, miniature component
size, higher power ratings, and the highest quality materials and construction. Since it
is far more than just the resistor value that drives the decision of which resistor to use
in a circuit design, Bourns is committed to ensuring designers’ needs are met with the
company’s extensive portfolio of resistive products. In this white paper, the various types
of resistors will be briefly explained, and tables are provided as a quick reference for the
available range of resistive products.
Bourns® Resistive Products
Selecting the Right Resistor for Your Application
Overview of Resistor Families
CR Series
Regardless of the application, a resistor is essentially a current control, voltage drop product.
Additionally, Bourns® components can be designed to withstand unique application challenges like an
overcurrent pulse for a short duration without significant changes of resistor characteristics. Bourns®
Fixed Resistors can be defined by construction type (thick film, wirewound, etc.), the way they are
processed, (through-hole, surface mount, etc.) the intended use (current sense, high frequency, etc.),
accuracy, size, power or many other ways. Each resistor does two main things: control current and
control a drop in voltage.
CRT/CRL Series
Bourns also has a very broad offering of resistor network (Model 4xxx Series), in a wide selection of
industry standard models. Therefore, they can be used with an industry standard footprint for seamless
placement in printed circuit board designs.
CAT/CAY Series
Bourns® chip resistors are available in various package sizes, standard values and technologies
which are designed to meet most market requirements including those for specific application and
performance characteristics.
Bourns® CRL series resistors offer total resistance values less than those required by industry standards
providing engineers enhanced circuit design flexibility.
4816P
When more precision is desired, Bourns® CRT series provides tight tolerance and high precision over
a wide range of resistance values. These resistors are typically used in current sense applications and
precision circuits, with specific ordering characteristics for size and performance selection.
Table 1
CHF9838CNF Series
1/11 • e/N1064
CRT Series Chip Resistors
Power
Max.
Voltage
Max.
Overload
CRT0402
0.063 W
25 V
50 V
CRT0603
0.1 W
50 V
100 V
CRT0805
0.125 W
100 V
200 V
CRT1206
.25 W
150 V
300 V
Model
TCR
Options
(PPM/°C)
TR Range
Absolute
Tolerance
10 Ω - 205 kΩ
5, 10, 15, 20, 25
10 Ω - 1 M
2Ω-2M
1Ω - 2.5 M
0.01 % - 1 %
Bourns® Resistive Products
Selecting the Right Resistor for Your Application
Overview of Resistor Families (Continued)
CR Series
Bourns® resistor networks and chip resistor arrays are available to meet a variety of needs, and the
figures below illustrate possible configurations inside Bourns® resistor networks. CAT/CAY resistor
arrays are offered in isolated and various bussed configurations.
CRT/CRL Series
1
N
1
Isolated
N
1
Bussed
N
Dual Terminator
CAT/CAY Series
4816P
N
N
N
1
1
1
Figure 1
CHF9838CNF Series
Bourns offers general purpose resistors with uniform value as well as dual termination
resistors, intended for specialized applications such as gigabit communication networks.
Designs that feature field programmable gate arrays (FPGAs) harness the miniaturized
circuitry and superior quality of the high performance Bourns® CAT16 series for low voltage
differential signal (LVDS) interfaces.
Table 2
Model
Chip Resistors
Package
Description
TCR
Tolerance
Resistance
CR
0201 - 2512
Standard Chip
Resistor
200
1 %, 5 %
1 - 10 MΩ
CRL
0603 - 2512
Current Sense Resistor
200 - 600
1 %, 5 %
0.01 - 9 Ω
2506
LVDS Termination
(Xilinx FPGA)
200
5%
Special Values
(Check Website)
0804/1206/1608
Resistor Array
200
1 %, 5 %
10 - 1 MΩ
0402 - 1206
Thin Film Chip
Resistor
5 - 50
0.01 % - 1 %
1 Ω - 2.5 M
CAT16PC4F12,
CAT16LV4F12
CAY/CAT
CRT
1/11 • e/N1064
Available Fixed Resistor configurations
Bourns® Resistive Products
Selecting the Right Resistor for Your Application
Overview of Resistor Families (Continued)
CR Series
CRT/CRL Series
CAT/CAY Series
4816P
CHF9838CNF Series
1/11 • e/N1064
Bourns® pulse resistors and current sense resistors are highly specialized for applications such
as motor drives and industrial equipment. The resistor typically has a very small value and
provides a measure of current in critical areas of the circuit. Bourns® pulse resistors are capable of
withstanding surges without a material change in the characteristics of the resistor.
Bourns offers the CRA, CRF, CRM and PWR pulse and current sense resistors in typical package
styles such as through-hole, bent metal and TO-220 configurations. DPAK and D2PAK are available
as well.
Bourns® CHF series are high frequency RF power resistors. Specialized for RF applications
and high frequency signals, they are commonly used in GSM, UMTS, and WiMax interfaces
with standard circuits such as isolators, combiners, and duplexers and in television and radio
applications in combiner and divider interfaces. These parts are available in the 9 GHz range with
power ratings up to 1 kW. The Bourns® CHF series is set apart from other high frequency resistors
by its material and construction. High quality copper and solid construction provide superior
characteristics. Bourns® CHF resistors are constructed with a thick film process. Bourns has
decades of successful experience with this process, and a customized resistor can be created if a
specific requirement is not met by a standard part.
Bourns® Resistive Products
Selecting the Right Resistor for Your Application
Overview of Resistor Families (Continued)
CR Series
CRT/CRL Series
Bourns® CHF resistors are provided in a standard surface mount package. These parts can
be either electrically insulated or terminated. Generally, there is one exposed lead while the
other lead is tied to the ground plane or to a heat sink. The substrates used in the surface
mount Bourns® CHF resistors are Aluminum Nitride and Beryllium Oxide. Higher power
parts with flanged packages have substrates of Beryllium Oxide, Alumina, and Aluminum
Nitride. While the substrates help to dissipate heat, operation at higher power levels may
require a heat sink to handle the dissipation. In some designs, the CHF series is bolted to the
heat sink, printed circuit board, or ground plane. The power ratings of Bourns® CHF resistors
make it possible to absorb very high pulses in high power situations.
Table 3
CAT/CAY Series
4816P
CHF9838CNF Series
1/11 • e/N1064
High Frequency Resistors
Power (W)
Frequency
(GHz)
VSWR
Substrate
Resistor Values
(Ohms)
CHF2010CNP
10
2
1.2
ALN
50, 100 +/- 5 %
CHF1206CNT
20
3
1.25
ALN
50 +/- 5 %
CHF2525CNT
40
9
1.25
ALN
50 +/- 5 %
CHF3725CNP
40
4
1.2
ALN
50 +/- 5 %
CHF3523CNT
150
3
1.1
ALN
50 +/- 5 %
CHF3020CBF
10
4
1.35
BEO
50, 100, 200 +/- 5 %
CHF5225xxF
60/30/20
4
1.2
ALN, AL203, BEO
50, 100 +/- 5 %
CHF8838CNF
150
4
1.2
ALN
50, 100 +/- 5 %
CHF9838CxF
250
4
1.2
ALN, BEO
50 +/- 5 %
CHF12545CBF
500
1
1.1
BEO
50, 100 +/- 5 %
CHR190104CBF
800
1
1.2
BEO
12.5, 25, 50, 100 +/- 5 %
CHF190104KBF
1000
1
1.2
BEO
50 +/- 5 %
Model
Bourns® Resistive Products
Selecting the Right Resistor for Your Application
Benefits of Working with Bourns
CR Series
CRT/CRL Series
Bourns offers standard resistors for vast applications needs, and when one is not available it
is likely that it can be created by customizing an existing, proven part. Bourns has lead in the
development and innovation of resistive products for decades and continues to expand its
product offerings based on the needs of designers and on emerging market applications. As
an example, certain applications including consumer goods require a resistor that is fuseable.
This fuseable resistor will become an open circuit during a surge to prevent the electronics
from catching fire. This is just one example of Bourns being ready to meet evolving
requirements with a high quality solution. Designers’ concerns about size, power and quality
of the component have been addressed when they select a resistor from Bourns.
CAT/CAY Series
4816P
CHF9838CNF Series
For further technical support and for more information on Bourns® Resistive Products,
please visit
www.bourns.com
“Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries.
COPYRIGHT© 2011 • BOURNS, INC. • 1/11 • e/N1064
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