CSM Series Bulk Metal Technology High Precision, Current Sensing, Power Surface Mount, Metal Strip Resistor with Resistance Value from 1 m, Rated Power up to 3 W and TCR to 0 15 ppm/C Maximum FEATURES Temperature coefficient of resistance: 15 ppm/C max. (- 55 C to + 125 C, + 25 C ref.) 10 ppm/C max. (- 55 C to + 125 C, + 25 C ref.) is available on request (see table 1) Power rating: 1 W to 3 W Resistance tolerance: 0.1 % No minimum order quantity and any value at any Resistance range: 1 m to 200 m tolerance available within resistance range. Bulk Metal Foil resistors are not restricted to standard The Vishay Foil Resistors (VFR) application engineering values, specific as required values can be supplied at no department is available to advise and make extra cost or delivery (e.g. 2.3456 m vs. 2 m) recommendations. Load life stability to 0.2 % (70 C, 2000 h at rated power) For non-standard technical requirements and special applications, please contact foil vpgsensors.com. Short time overload: 0.1 % typical Thermal EMF: 3 V/C (DC offset error, significant for low BC values) R I I Maximum current: up to 54 A Proprietary processing techniques produce low TCR, tight A D tolerance and improve stability V ~ Low inductance < 5 nH Zin = Solderable terminations Four terminal (Kelvin) design: allows for precise and Excellent frequency response to 50 MHz accurate measurements. Matched sets are available on request FIGURE 1 - POWER DERATING CURVE Screening in accordance with EEE-INST002 available + 70 C (per MIL-PRF-55342 and MIL-PRF-49465 see 303144 100 and 303145 datasheets) 80 Terminal finishes available: lead (Pb)-free, tin/lead alloy 60 Quick prototype quantities available, please contact 40 foil vpgsensors.com 20 For better performance please contact Application Engineering 0 - 65 - 50 - 25 0 25 50 75 100 125 150 170 Compliant to RoHS directive 2002/95/EC Ambient Temperature (C) TABLE 1 - SPECIFICATIONS PARAMETER CSM2512 CSM3637 Resistance Range 1 m to 200 m 3 W ( 1 m to 10 m) (1) Power Rating at 70 C 1 W 2 W (> 10 m to 200 m) (2) Maximum Current 31 A 54 A 0.5 % (1 m to < 3 m) 0.5 % (1 m to < 2 m) Tolerance 0.1 % (3 m to 200 m) 0.1 % (2 m to 200 m) Temperature Coefficient 50 ppm/C (1 m to < 3 m) 25 ppm/C (1 m to < 3 m) Max. (- 55 C to + 125 C, 15 ppm/C (3 m to 200 m) 15 ppm/C (3 m to 200 m) (3) (3) + 25 C Ref.) 10 ppm/C (3 m to 10 m) is available on request 10 ppm/C (1 m to 10 m) is available on request Operating Temperature - 65 C to + 170 C Range 1/2 Maximum Working Voltage (P x R) Weight (Maximum) 0.09 g 0.29 g Notes (1) For values above 0.1 derate linearly to 80 % rated power at 0.5 (2) Maximum current for a given resistance value is calculated using I = PR (3) Please contact application engineering: foil vpgsensors.com * This datasheet provides information about parts that are RoHS-compliant and/or parts that are non-RoHS-compliant. For example, parts with lead (Pb) terminations are not RoHS compliant. Please see the information/tables in this datasheet for details. Document Number: 63089 For any questions, contact www.vishayfoilresistors.com Revision: 17-Aug-15 foil vpgsensors.com 1 Rated Power (%)CSM Series ABOUT CSM (Low Ohm Value 1 m to 200 m ) New high-precision Bulk Metal surface-mount Power Metal in critical locations can greatly improve circuit performance, Strip resistor of 1 m to 200 m that features an improved long-term application-related performance, as well as the load-life stability of 0.2 % at + 70 C for 2000 h at rated designers peace-of-mind. power, an absolute TCR of 15 ppm/C maximum from Additionally, the overall system cost is often reduced when a - 55 C to + 125 C, + 25 C ref., and a tolerance of 0.1 %. knowledgeable designer concentrates costs in a few Typical current sensing resistors offer a load-life stability of exceptionally stable components whose proven minimal- 1 % through a 2000 h workload. The improved resistance deviation load and environmental stability can often eliminate stability of the CSM Series makes it ideal for the necessity of additional compensating circuitry or tightened-stability voltage division and precision current temperature-controlling systems. The higher reliability and sensing applications in switching linear power supplies, better overall system performances also achieve excellent power amplifiers, measurement instrumentation, bridge product results in the field, enhancing market acceptance networks, and medical and test equipment. In addition, the and product reputation. CSM Series complies with EEE-INST-002 (MIL-PRF 55342 Designers often unnecessarily pay for tighter tolerances than and MIL-PRF 49465) for military and space applications. required simply to accommodate the resistance stability Traditional Passive current sensors and shunts generate shifts they know to be imminent in an application due to the heat under power, which changes their resistance, and thus large application-related changes in the components they their voltage output. The CSMs low absolute TCR reduces selected. Selection of a high-stability component like the errors due to temperature gradients, thus reducing a major CSM in these applications eliminates the need for shift source of uncertainty in current measurement. The CSM allowance due to planned instability and allows the use of can withstand unconventional environmental conditions, looser initial tolerances than would be necessary with including the extremely high temperatures and radiation-rich current-sensing resistors based on other technologies. environments of down-hole oil exploration and well logging, The Key Applications or the deep-sea underwater repeaters in cross-ocean Applications requiring accuracy and repeatability under communications. stress conditions such as the following: The stability of the CSM can be further enhanced by Switching and linear power supplies post-manufacturing operations (PMO), such as temperature cycling, short-time overload, and accelerated load life which Precision current-sensing are uniquely applicable to Bulk Metal Foil resistors. Power management systems The device features a low thermal electromotive force (EMF) Feedback circuits that is critical in many precision applications. The CSMs Power amplifiers all-welded construction is composed of a Bulk Metal Measurement instrumentation resistive element with welded copper terminations, plated for soldering. The terminations make true ohmic contact with the Precision instrumentation amplifiers resistive layer along the entire side of the resistive element, Medical and automatic test equipment thereby minimizing temperature variations. Also, the resistor Satellites and aerospace systems element is designed to uniformly dissipate power without Commercial and Military avionics creating hot spots, and the welded terminations material is compatible with the element material. Test and measurement equipment These design factors result in a very low thermal-EMF Electronic scales (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 parasitic voltage generated at the junction of two dissimilar metals, which is especially important in low-value current-sensing resistors, is minimized, while the pure current-to-voltage conversion is protected from such interference 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 www.vishayfoilresistors.com For any questions, contact Document Number: 63089 2 foil vpgsensors.com Revision: 17-Aug-15