improved product bulk metal ? technology high precision, current sensing, power surface mount, metal strip resistor wi th improved st ability 0.05 % , resistance value from 10 m , rated power to 1 w and tcr to 0 15 ppm/c csm2512s vishay foil resistors document number: 63145 for any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com revision: 3-may-11 1 the csm?s series of low value current sense resistors provides power and precision in a four terminal, surface mount configuration. its all welded construction is made up of a bulk metal ? resistive element with plated copper terminations. vishay foil resistors? application engineering department is available to advise and make recommendations. for non-standard technical requirements and special applications, please contact foil@vishaypg.com . features ? temperature coefficient of resistance (tcr): (- 55 c to + 125 c, + 25 c ref.) 15 ppm/c maximum 10 ppm/c maximum on special request ? load life stability to 0.05 % (70 c, 2000 h at rated power) ? power rating: 1 w ? resistance tolerance: 0.1 % ? resistance range: 10 m to 100 m ? vishay foil resistors are not restricted to standard values, we can supply specific ?as required? values at no extra cost or delivery (e.g. 10.2345 m vs. 10 m ) ? short time overload: 0.1 % typical ? thermal emf: < 3 v/c ? maximum current: up to 10 a ? surface mount configuration ? four terminal (kelvin) design: allows for precision accurate measurements ? terminal finishes available: lead (pb)-free, tin/lead alloy ? screening in accordance with eee-inst002 available (per mil-prf-55342 and mil-prf-49465; see datasheets of 303144 and 303145 ) ? prototype quantities available in just 5 working days or sooner. for more information, please contact foil@vishaypg.com ? for better performances please contact application engineering * pb containing terminations are ro hs compliant, exemptions may apply i a r z in i d v = ~ bc figure 1 - power derating curve - 65 - 50 - 25 0 25 50 75 100 125 150 170 ambient temperature (c) 100 80 60 40 20 0 rated power (%) + 70 c table 1 - performance specifications parameter csm2512s resistance range 10 m to 100 m power rating at 70 c 1 w maximum current 10 a maximum working voltage (p x r) 1/2 tightest tolerance 0.1 % temperature coefficient maximum (- 55 c to + 125 c, + 25 c ref.) 15 ppm/c, 10 ppm/c is available operating temperature range - 65 c to + 170 c weight (maximum) 0.09 g
csm2512s vishay foil resistors www.vishayfoilresistors.com f or any questions, contact: foil@vishaypg.com document number: 63145 2 revision: 3-may-11 improved product about csm (low ohm value 10 m to 100 m ) the csm2512s series of low value current sense resistors provides power and precision in a four terminal, surface mount configuration. its all welded construction is made up of a bulk metal ? resistive element with plated copper terminations. for low value resistors in precision applications it is necessary to use four-terminal kelvin connections to obtain a precise voltage drop across the resistive element. in these applications, the contact resistance and the terminal resistance may have the same order of magnitude or be even greater than that of the el ement resistance itself. thus, significant error is introduced because the high temperature coefficient of resistance of the leads and the contact resistance are unavoidably incorporated into the measurements when the current sense resistor has only two leads. because the ability to measure low values to tolerances of 0.1% or tighter is a concern to both the manufacturer and the user, many situations requir e coordination of measurement standards between both parti es. coordination is often accomplished by exchange of serialized units with recorded readings to align measurement practices and specific reference standards. the problem is compounded when high-precision current sensors under moderate to high power experience self-heating (joule effect) which causes the in-service resistance value to be different from that obtained using low current measurement equipment. therefore, the measurement conditions must be defined and accepted at the time of spec preparation-that is, resistance value as determined by spec ified current and measured ir-drop following a specified period of stabilization. measurement equipment is available from a number of sources with varying stated accuracies. traditional passive current sensors and shunts generate heat under power, which changes their resistance, and thus their voltage output. the csm?s low absolute tcr reduces errors due to temperature gradients, thus reducing a major source of uncertainty in current measur ement. the csm can withstand unconventional environmental conditions, including the extremely high temperatures and radiation-rich environments of down-hole oil exploration and well logging, or the deep-sea underwater repeaters in cross-ocean communications. the stability of the csm can be further enhanced by post-manufacturing operations (pmo), such as temperature cycling, short-time overload, and accelerated load life which are uniquely applicable to bulk metal ? foil resistors. the device features a low thermal electromotive force (emf) that is critical in many precision applications. thermal emf in dc applications induces a voltage offset in the resistor that is equivalent to adding a small battery into the circuit. the csm?s all-welded construction is a bulk metal ? resistive element with welded copper terminations, plated for soldering. the terminations make a true continuous contact with the resistive layer along the entire side of the resistive element, thereby minimizing temperature variations. also, the resistor element is design ed to uniformly dissipate power without creating hot spots, and the welded terminations material is compatible with the element material. these design factors result in a ve ry low thermal-emf(<3 v/c) resistor, because in addition to the low thermal emf compatibility of the metals, the uniformity and thermal efficiency of the design minimizes the temperature differential across the resistor, thereby assuring low thermal emf generation at the leads. this further reduces the ?battery effect? exhibited by most current-sensing or voltage-reference resistors. thus, the para sitic voltage generated at the junction of two dissimilar metals, which is especially important in low-val ue current-sensing resistors, is minimized, while the pure current-to-voltage conversion is protected from such interf erence in dc applications. the stability problems associated with analog circuits are very pervasive, but knowledgeable selection of a few high-quality resistors, networks, or trimming potentiometers in critical locations can grea tly improve circuit performance, long-term application-related pe rformance, as well as the designer?s peace-of-mind. additionally, the overall system cost is often reduced when a knowledgeable designer concentrates costs in a few exceptionally stable components with minimal deviation and whose load and environmental stability can often eliminate the necessity of additional compensating circuitry or te mperature-controlling systems. the higher reliability and bette r overall system performances also achieve excellent product results in the field, enhancing market acceptance and product reputation. designers often unnecessarily pay for tighter tolerances than required simply to accommodate the re sistance stability shifts they know to be imminent in an application due to the large application-related changes in the components they selected. selection of a high-stability component like the csm in these applications e liminates the need for shift allowance due to ?planned inst ability? and allows the use of looser initial tolerances th an would otherwise be necessary.
csm2512s vishay foil resistors document number: 63145 for any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com revision: 3-may-11 3 improved product note (1) white dots indicate top side of part for mounting purposes figure 2 - dimensions and imprinting in inches (millimeters) dimensions - tolerances 0.010 ( 0.254), * 0.015 ( 0.381) resistance range ( )l w h t a b 0.01 to 0.1 0.250 (6.350) 0.125 (3.175) 0.025 (0.635) 0.030 (0.762) 0.030 (0.762)* 0.032 (0.813)* land pattern dimensions - tolerances 0.003 ( 0.076) resistance range ( )l b e a c d 0.01 to 0.1 0.160 (4.06) 0.145 (3.68) 0.055 (1.39) 0.065 (1.65) 0.045 (1.14) 0.021 (0.53) csm2512s dimensions h a w b t l (1) csm2512s land pattern kelvin connection i 1 , i 2 - current e 1 , e 2 - sense e i a d c b e 1 e 2 i 1 i 2 table 2 - csm2512s performance specifications test conditions mil-prf-49465b r limits typical r limits maximum r limits thermal shock - 55 c to + 150 c, 1000 cycles, 15 min at each extreme (0.5 % + 0.0005r) 0.1 % 0.2 % load life stability 2000 h, 70 c at rated power (1.0 % + 0.0005r) 0.05 % 0.2 % bias humidity 85 c, 85 % humidity 10 % bias, 1000 h (0.5 % + 0.0005r) 0.05 % 0.2 % short time overload 5 x rated power for 5 s (0.5 % + 0.0005r) 0.1 % 0.2 % high temperature exposure 1000 h, 170 c (1.0 % + 0.0005r) 0.2 % 0.3 % low temperature storage mil-prf-49465 (0.5 % + 0.0005r) 0.05 % 0.1 % moisture resistance mil-std-202, method 106, 0 % power, 7a and 7b not required (0.5 % + 0.0005r) 0.02 % 0.05 % shock 100 g, 6 ms (0.1 % + 0.0005r) 0.02 % 0.05 % vibration (10 hz to 2000 hz) 20 g (0.1 % + 0.0005r) 0.02 % 0.05 % resistance to soldering heat 10 s to 12 s at + 260 c (0.25 % + 0.0005r) 0.05 % 0.1 % solderability mil-std-202 95 % coverage -
csm2512s vishay foil resistors www.vishayfoilresistors.com f or any questions, contact: foil@vishaypg.com document number: 63145 4 revision: 3-may-11 improved product note (1) for non-standard requests, please co ntact application engineering. figure 3 - load life results of csm2512s vs. csm2512 -1500 -1000 -500 0 500 1000 1500 0 500 1000 1500 2000 2500 r/r (ppm) time (hours) csm2512s 0r05 load life 2000 hrs @ 1 w @ +70c (15 units) -3000 -2500 -2000 -1500 -1000 -500 0 500 1000 1500 2000 2500 3000 0 500 1000 1500 2000 r/r (ppm) time (hours) csm2512 0r05 load life 2000 hrs @ 1 w @ +70c (15 units) tl ll rt mr rmt new global part number: Y44870R10000B0R (preferred part number format) denotes precision value characteristics (1) yr = 0 = standard part, tin/lead termination 9 = standard part, lead (pb)-free termination 1 - 999 = custom product code resistance tolerance packaging 4487 = csm2512s b = 0.1 % c = 0.25 % d = 0.5 % f = 1.0 % w = waffle pack r = tape and reel for example: above global order y4487 0r10000 b 0 r: type: csm2512s value: 100.0 m absolute tolerance: 0.1 % termination: standard tin/lead packaging: tape and reel historical part number: csm2512s 0r1000 b b t (will continue to be used) csm2512s 0r1000 b b t model ohmic value abs. tolerance termination packaging 0r1000 = 0.100 b = 0.1 % c = 0.25 % d = 0.5 % f = 1.0 % s = lead (pb)-free b = tin/lead t = tape and reel w = waffle pack 4870 100 r y4 b0 0 r 0
vishay precision group document no.: 63999 revision: 27-apr-2011 www.vishaypg.com 1 legal disclaimer notice disclaimer legal disclaimer notice disclaimer document no.: 63999 revision: 27-apr-2011 all products, product specifications and data are subject to change without notice. vishay precision group, inc., its affliates, agents, and employees, and all persons acting on its or their behalf (collectively, vishay precision group), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. the product specifcations do not expand or otherwise modify vishay precision groups terms and conditions of purchase, including but not limited to, the warranty expressed therein. vishay precision group makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase. to the maximum extent permitted by applicable law, vishay precision group disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special, consequential or incidental damages, and (iii) any and all implied warranties, including warranties of ftness for particular purpose, non-infringement and merchantability. information provided in datasheets and/or specifcations may vary from actual results in different applications and performance may vary over time. statements regarding the suitability of products for certain types of applications are based on vishay precision groups knowledge of typical requirements that are often placed on vishay precision group products. it is the customers responsibility to validate that a particular product with the properties described in the product specifcation is suitable for use in a particular application. no license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any conduct of vishay precision group. the products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise expressly indicated. customers using or selling vishay precision group products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify vishay precision group for any damages arising or resulting from such use or sale. please contact authorized vishay precision group personnel to obtain written terms and conditions regarding products designed for such applications. product names and markings noted herein may be trademarks of their respective owners.
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