(knp - r) power wire wound resistor token electronics industry co., ltd. taiwan: no.137, sec. 1, zhongxing rd., wugu district, new taipei city, taiwan, r.o.c. 24872 t el : +886 2981 0109 f ax : +886 2988 7487 china: 12f, zhong xing industry bld., chuang ye road, nan shan district, shen zhen city, guang dong, china 518054 tel : +86 755 26055363; fax : +86 755 26055365 web: www.token.com.tw email: rfq@token.com.tw version: january 12, 2017
taiwan factory : +886 2 29810109 http://www.token.com.tw rfq@token.com.tw china factory : +86 755 26055363 page: 1 / 4 ? product introduction features : ? excellent load life stability ? high precision and reliability ? axial ceramic - silicone coated ? meets the standards of mil - r - 26e ? rohs compliant with 100% lead free applications : ? radar, ground vehicles ? communications systems ? bias supply, current shunts, voltage dropping ? motor speed controls, voltage divider networks ? medical instrumentation and medical implantables tokens highest quality conformal axial terminal ceramic - silicone coated knp - r power resistors for applications requiring high stability and precision. the knp - r wire - wound has a low temperature coefficient and maintain a high degree of stability under dem anding conditions. the power precision knp - r series meeting mil - r - 26e (u and v characteristics) and surface temperature (hot spot) 375 max. resistors with a wide range of 0.01 ~ 82k, covering applications from precision to power. products with lead - free terminations meet eu rohs and china rohs requirements. operating temperature range is - 55 ~ +375 and derated power at high ambient temperatures as according to the chart below. token is equipped to design and produce custom comp onents to meet many design and reliability demands. in addition to standard military - grade resistor products, we also have many resistive products designed to meet various source - controlled drawings. contact us with your specific needs. or link to token o fficial website " general purpose resistors " for more information. characteristics u: 275 maximum hot spot temperature. 1% maximum r in 1000 hours load life. characteristics v: 375 maximum ho t spot temperature. 3% maximum r in 1000 hours load life. power wire wound resistors boast consistent precision power operation.
taiwan factory : +886 2 29810109 http://www.token.com.tw rfq@token.com.tw china factory : +86 755 26055363 page: 2 / 4 ? technical specifications technical specifications (knp -r) type mil - r - 26e power rating (w) max. working voltage (v) resistance range () dimensions (unit: mm) u (275 ) v (375 ) u (275 ) v (375 ) 0.1% , 0.25% , 0.5% 1% , 2% , 3% , 5% l0.81 d0.81 d0.1 knp - r1/4 - 0.40 - 20 - 10~950 1~3.4k 6.35 1.98 0.51 knp - r1/2 rw70 0.75 - 29 - 10~1.3k 1~4.9k 7.92 1.98 0.51 knp - r1a - 1.00 - 53 - 1~2.7k 0.1~10.4k 10.31 2.36 0.64 knp - r1 rw69 1.10 - 62 - 1~4.0k 0.1~15k 13.49 2.36 0.64 knp - r2a - 2.50 3.25 138 157 1~8.6k 0.01~32.3k 12.70 5.33 0.81 knp - r2 rw79 3.00 3.75 135 148 1~5k 0.01~2k 13.49 4.06 0.81 knp - r3a - 3.00 3.75 135 148 1~6.5k 0.01~34.5k 14.27 5.33 0.81 knp - r3 - 3.25 4.75 185 220 1~11.4k 0.01~42.1k 20.62 5.33 1.02 knp - r4 rw67 4.00 5.50 210 250 1~12.7k 0.01~47.1k 15.88 7.62 1.02 knp - r5 rw74 5.00 6.50 330 376 0.5~24.5k 0.01~51k 22.22 7.62 1.02 knp - r7 rw68 7.00 9.00 504 576 0.5~41.4k 0.01~75k 30.94 9.52 1.02 knp - r10 rw78 10.00 13.00 799 911 0.5~71.3k 0.01~82k 45.21 9.52 1.02 knp - r power derating curve power precision wire wound resistor (knp - r) dimensions temperature coefficient: 1 and below 150 ppm/ , 1 to 9.9 100 ppm/ , 10 and above 100 ppm/ , (50 ppm/ on request)
taiwan factory : +886 2 29810109 http://www.token.com.tw rfq@token.com.tw china factory : +86 755 26055363 page: 3 / 4 ? electrical performance electrical performance (knp -p ) test items test method specifications short time overload 2.5 times of rated voltage 5 sec. r(2%+0.05) rated load rated wattage 30 minutes. r(1%+0.05) voltage withstanding 500vac 1 minute. r(1%+0.05) insulation resistance 500v 20m temp. cycle - 20 ~ 85 5 cycles r(1%+0.05) soldering after resistance 235 for 3 sec r(0.5%+0.05) incombustibility 16 times of rated wattage for 5 min. not flamed load life +25 , 1.5hrs on ~ 0.5hrs off cycle, 1000 hrs. u: r(1%+0.05) v: r(3%+0.05) ? application notes application notes of wire wounds (knp -r) ? when being used in ac circuits, some wirewound structures give inductance ingredients or parasitic capacity, so they may cause unusual phenomena such as oscillations etc. quorum deviations of other components should be carefully taken into account for use. ? application and placement: wirewound resistors use different gauges of wire as resistance elements. sometimes the gauge is extremely thin (finer than a strand of human hair) and very susceptible to breakage in environments containing salts, ash, dust and corrosives. avoid utilization in such environments. ? do not install in dusty areas because the accumulation will cause shorts and poor conductance. ? order codes order codes (knp - r) knp - r3a u 100r b p part number knp - r characteristic ( ) u 275 v 375 resistance value () 0r1 1.0 1r 1 100r 100 1k 1000 resistance tolerance (%) b 0.1% c 0.25% d 0.5% f 1% g 2% h 3% j 5% package p bulk tb taping box
taiwan factory : +886 2 29810109 http://www.token.com.tw rfq@token.com.tw china factory : +86 755 26055363 page: 4 / 4 ? general information general purpose resistors with customized service token electronics is expanding business to include a broad range of general purpose resistor products designed for high volume applications. this expanded range of commercial resistor presents a more comprehensive product offering for customer experience m anagement (cem) and other high volume customers that require quality products at competitive pricing. backed by the same customer service, technical support and quality assurance that token has always provided, these new commercial products enable you the opportunity to source a wider range of resistors from a trusted supplier. general use when an ambient temperature exceeds a rated ambient temperature, resistor shall be applied on the derating curve by derating the load power. general purpose resistor un der overloads is not combustion resistant and is likely to emit, flame, gas, smoke, red heat, etc. flame retardant resistor generally emits smoke and red heat in a certain power and over but do not emit fire or flame. when resistors are shielded or coated with resin etc., stress from the storage heat and the resins are applied. so, performance and reliability should be checked well before use. when a voltage higher than rated is applied in a short time (single pulse, repeated pulses, surge, etc.), it does not necessarily ensure safety that an effective wattage is not higher than a rated wattage. then consult with us with your specified pulse wave shape. resistors shall be used in a condition causing no dew condensation. keep temperature from rising by cho osing resistor with a higher rated capacity; do not use a component having the exact load value required. for considerations of safety in extended period applications, the rating should be more than four times higher than the actual wattage involved, but n ever use resistors at less than 25% of its rated power. in applications where resistors are subject to intermittent current surges and spikes, be sure in advance that the components selected are capable of withstanding brief durations of increased load. do not exceed the recommended rated load. resistor must use within the rated voltage range to prevent the shortening of service life and/or failure of the wound resistance elements. minimum load: resistor must be utilized at 1/10 or more of the rated volt age to prevent poor conductance due to oxidation build - up. for basic particulars for cautions, refer to eiaj technical report rcr - 2121 "guidance for care note on fixed - resistors".
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