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CMF55301KDKEK Datasheet(PDF) 3 Page - Vishay Siliconix |
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CMF55301KDKEK Datasheet(HTML) 3 Page - Vishay Siliconix |
3 / 5 page CMF Industrial www.vishay.com Vishay Dale Revision: 09-Sep-13 3 Document Number: 31018 For technical questions, contact: ff2aresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 TEMPERATURE COEFFICIENT CODES GLOBAL TC CODE HISTORICAL TC CODE TEMPERATURE COEFFICIENT E T-9 25 ppm/°C H T-2 50 ppm/°C K T-1 100 ppm/°C L T-0 150 ppm/°C N T-00 200 ppm/°C LOAD LIFE SHIFT DUE TO POWER AND DERATING (AT +70 °C AND AT +125 °C) The power rating for the CMF parts is tied to the derating temperature, the heat rise of the parts, and the R for the load life performance. When the tables/graphs below are used together they show that when the parts are run at their higher power ratings, the parts will run hotter, which has the potential of causing the resistance of the parts to shift more over the life of the part. LOAD LIFE SHIFT VS. POWER RATING LOAD LIFE MAXIMUM R (TYPICAL TEST LOTS) ± 0.15 % ± 0.5 % ± 1.0 % ± 0.15 % ± 0.5 % ± 1.0 % MODEL POWER RATING AT +70 °C POWER RATING AT +125 °C CMF50 1/20 W and 1/10 W 1/8 W 1/4 W 1/20 W 1/10 W 1/8 W CMF55, CMF07 1/10 W and 1/8 W 1/4 W 1/2 W 1/10 W 1/8 W 1/4 W CMF60, CMF20 1/8 W and 1/4 W 1/2 W 3/4 W and 1 W 1/8 W 1/4 W 1/2 W CMF65 1/4 W and 1/2 W 3/4 W 1 W 1/4 W 1/2 W 3/4 W CMF70 1/4 W and 1/2 W 3/4 W 1 W 1/4 W 1/2 W 3/4 W CMF resistors have an operating temperature range of -55 °C to +175 °C. They must be derated at high ambient temperatures according to the derating curve. Example: When a CMF55 part is run at 1/8 W in a 70 °C ambient environment, the resistor will generate enough heat that the surface temperature of the part will reach about 19 °C over the ambient temperature, and over the life of the part this could cause the resistance value to shift up to ± 0.15 %. If the same resistor was instead run at 1/4 W in a 70 °C environment, the element will heat up to about 30 °C over ambient, and over the life of the part the resistance value could shift roughly ± 0.5 %. And if the resistor was run at it maximum power rating of 1/2 W in a 70 °C environment, it will heat up to about 58 °C over ambient, and you could see the resistance value shift roughly ± 1 % over the life of the part. MATERIAL SPECIFICATIONS Element Vacuum-deposited nickel-chrome alloy Coating Flame retardant epoxy, formulated for superior moisture protection Core Fire-cleaned high purity ceramic Solderability Continuous satisfactory coverage when tested in accordance with MIL-R-10509 AMBIENT TEMPERATURE IN °C DERATING 120 100 80 60 40 20 0 - 55 - 50 - 25 0 25 70 75 100 125 150 165 175 50 200 APPLIED POWER IN W THERMAL RESISTANCE 120 100 80 60 40 20 0 0 0.125 0.25 0.375 0.5 0.75 0.875 1 1.125 0.625 CMF50 CMF55, CMF07 CMF60, CMF20 CMF65, CMF70 |
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