introduction 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 specifc applications. bourns ofers 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 todays broad market requirements. tere are many advantages to incorporating bourns? resistors into todays 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 companys extensive portfolio of resistive products. in this white paper, the various types of resistors will be briefy explained, and tables are provided as a quick reference for the available range of resistive products. cr series crt/crl series cat/cay series 4816p chf9838cnf series selecting the right resistor for your application bourns? resistive products 1/11 ? e/n1064
crt series chip resistors table 1 overview of resistor families 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 signifcant changes of resistor characteristics. bourns? fixed resistors can be defned by construction type (thick flm, 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. bourns also has a very broad ofering of resistor network (model 4xxx series), in a wide selection of industry standard models. terefore, they can be used with an industry standard footprint for seamless placement in printed circuit board designs. bourns? chip resistors are available in various package sizes, standard values and technologies which are designed to meet most market requirements including those for specifc application and performance characteristics. bourns? crl series resistors ofer total resistance values less than those required by industry standards providing engineers enhanced circuit design fexibility. when more precision is desired, bourns? crt series provides tight tolerance and high precision over a wide range of resistance values. tese resistors are typically used in current sense applications and precision circuits, with specifc ordering characteristics for size and performance selection. model power max. voltage max. overload tcr options (ppm/c) tr range absolute tolerance crt0402 0.063 w 25 v 50 v 5, 10, 15, 20, 25 10 - 205 k 0.01 % - 1 % crt0603 0.1 w 50 v 100 v 10 - 1 m crt0805 0.125 w 100 v 200 v 2 - 2 m crt1206 .25 w 150 v 300 v 1 - 2.5 m selecting the right resistor for your application bourns ? resistive products 1/11 ? e/n1064 cr series crt/crl series cat/cay series 4816p chf9838cnf series
available fixed resistor confgurations figure 1 overview of resistor families (continued) bourns? resistor networks and chip resistor arrays are available to meet a variety of needs, and the fgures below illustrate possible confgurations inside bourns? resistor networks. cat/cay resistor arrays are ofered in isolated and various bussed confgurations. bourns ofers general purpose resistors with uniform value as well as dual termination resistors, intended for specialized applications such as gigabit communication networks. designs that feature feld programmable gate arrays (fpgas) harness the miniaturized circuitry and superior quality of the high performance bourns? cat16 series for low voltage diferential signal (lvds) interfaces. isolated bussed d ual te rminato r 1n 1n 1 1 n n 1 n 1 n chip resistors table 2 model package description tcr tolerance resistance cr standard chip resistor mf cr current sense resistor . f catpcf catvf vds termination (ilinx fpga) special values (check website) ca/cat // resistor array mf crt thin film chip resistor . f . m selecting the right resistor for your application bourns ? resistive products 1/11 ? e/n1064 cr series crt/crl series cat/cay series 4816p chf9838cnf series
overview of resistor families (continued) bourns? pulse resistors and current sense resistors are highly specialized for applications such as motor drives and industrial equipment. te 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 ofers the cra, crf, crm and pwr pulse and current sense resistors in typical package styles such as through-hole, bent metal and to-220 confgurations. dpak and d 2 pak 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. tese parts are available in the 9 ghz range with power ratings up to 1 kw. te 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 flm process. bourns has decades of successful experience with this process, and a customized resistor can be created if a specifc requirement is not met by a standard part. selecting the right resistor for your application bourns ? resistive products 1/11 ? e/n1064 cr series crt/crl series cat/cay series 4816p chf9838cnf series
high frequency resistors table 3 model 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 % overview of resistor families (continued) bourns? chf resistors are provided in a standard surface mount package. tese 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. te substrates used in the surface mount bourns? chf resistors are aluminum nitride and beryllium oxide. higher power parts with fanged 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. te power ratings of bourns? chf resistors make it possible to absorb very high pulses in high power situations. selecting the right resistor for your application bourns ? resistive products 1/11 ? e/n1064 cr series crt/crl series cat/cay series 4816p chf9838cnf series
benefts of working with bourns bourns ofers 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 oferings 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. tis fuseable resistor will become an open circuit during a surge to prevent the electronics from catching fre. tis 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. for further technical support and for more information on bourns? resistive products, please visit www.bourns.com americas : tel +1-951 781-5500 fax +1-951 781-5700 emea: tel +41-(0)41 768 55 55 fax +41-(0)41 768 55 10 asia-pacifc : tel +886-2 256 241 17 fax +886-2 256 241 16 bourns is a registered trademark of bourns, inc. in the u.s. and other countries. copyright? 2011 ? bourns, inc. ? 1/11 ? e/n1064 selecting the right resistor for your application bourns ? resistive products 1/11 ? e/n1064 cr series crt/crl series cat/cay series 4816p chf9838cnf series
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