01 of 03 preview tokens current sense lra open air resistors are expected to gain wide acceptance in the worldwide market as a result of increased thermal management capabilities. the lra series is designed for applications requiring the transfer of heat away from circuits and solder joints. available in 0.5w, 1w, and 1.5w rating, the resistor is being specifed for current sensing, feedback, current detective, supper low inductance, as well as surge and pulse applications. the hot spot on the lra resistor is approximately 0.2 degrees higher than on a typical metal strip chip resistor. this results in an increased thermal path for the lra, reducing heat transfer into the solder joints and circuits. the fameproof lra series resistors are constructed of a wire resistive element with welded copper leads to prevent solder wicking, which can change the devices resistance value in the circuit by as much as 30%. because of this, the device is ideal for thermally harsh environments, including automotive and aerospace applications, as well as enclosed, poorly ventilated circuits in applications such as laptop computers. the lra open air series feature a reduced pitch, or spacing between the leads on the circuit board (with a corresponding increase in the board mounted profle), when compared to the standard token lrb series devices. the lra resistors are rated for 1w or 1.5w at 70c, with resistance values from 0.1 to 0.003 and tolerances down to 1%. operating temperature range is -50c to 300c. the lra series is available in bulk packaging in 200 increments. token will also produce devices outside these specifcations to meet customer requirements. a lead-free rohs- compliant version is available, as is a non-inductive version for high frequency applications. contact us with your specifc needs. lra low ohmic open air resistors low ohmic open air (lra) resistors feature longer thermal path low ohmic open air resistors features - radial leads. - non-inductance. - solderable copper leads. - lead (pb)-free and rohs compliant. - 1%, 3%, 5%, 10% standard tolerance. - high stability bare metal element open air style. applications - high power ac/dc detection. - automotive, feedback system. - residual battery power detection. - inverter and switching power supplies - cpu drive control, power tool motor controls. - power supply shunt, current detective, and current sensing. http://www.token.com.tw/ rfq token.com.tw t oke n version 2010
02 of 03 dimensions (unit: mm) marking rm m m measuring point 3.5+1 hmax 0.8 3 +0.5 -1.5 0 10 type h max. rm lra350-009 6.5 10 lra351-009 10.5 LRA352-009 17.0 lra351-010 8.0 15 lra352-010 14.5 lra352-010 16.11.0 14.51.0 lra352-010 17.11.0 14.51.0 lra352-011 12.0 20 construction: 1. the resistive elements consist of a fat metal-band. 2. spot welded cu-terminals ensure high stability of contacts. 3. thus, this construction results in a non inductive of both high stability and overload capacity. packing specifcation type packaging pieces pack.-code lra350-009 bulk 200pcs bulk lra351-009 lra351-010 bulk 200pcs bulk lra352-010 lra352-011 bulk 200pcs bulk lra low ohmic open air resistors version 2010 http://www.token.com.tw/ rfq token.com.tw t oke n
03 of 03 characteristic specifcation type lra 350-009 351-009 351-010 352-009 352-010 352-011 power rating p70 w 0.5 1.0 1.5 resistance range r003~r051 r004~r068 r006~r10 e-series e24r010 tolerances % 1, 3, 5, 10 temperature coeffcient ppm +200~+1200 max. cont. working voltage vrms for all styles insulation voltage (1min.) vrms non insulated insulation resistance non insulated derating, linear c 70~300(0w) climatic category 55/200/56 temperature range c -50~300 thermal resistance kw-1 200 100 70 failure rate (total , max, 60% conf. lev.) 10-9 * h-1 ca.10, depends on value endurance (p70, 70,1000h) [ ]% 3.0 damp heat ,steady state(40c,93% r.h.,56d) [ ]% 0.5 climatic sequence [ ]% 0.5 terminal strength [ ]% 0.5 terminal tensile strengths n 30 resistance to soldering heat ( 260c,10s ) [ ]% 0.2 typ. solder ability s 2.5 flow time, solder globule test iec 60068-2-20-t making value imprinted how to order ? ? r024 ? ? j bulk ? part number ? resistance value () ? tolerance ? pack. -code code resistance value r020 0.020 r022 0.022 r024 0.024 r100 0.100 code tolerance f 1% g 2% j 5% k 10% lra low ohmic open air resistors version 2010 http://www.token.com.tw/ rfq token.com.tw t oke n back to 1st page - low ohmic open air resistors (lra) code p bulk
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