walsin technology corporation page 2 of 7 WR04X version 12 jul.-2004 feature 1. small size and light weight 2. high reliability and stability 3. reduced size of final equipment 4. lower assembly costs 5. higher component and equipment reliability 6. lead free product is available application ? mobile phone ? pda ? camcorders ? pagers ? palmtop computers description the resistors are constructed in a high grade ceramic body (aluminum oxide). internal metal electrodes are added at each end and connected by a resistive paste that is applied to the top surface of the substrate. the composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to nominated value within tolerance which controlled by laser trimming of this resistive layer. the resistive layer is covered with a protective coat. finally, the two external end terminations are added. for ease of soldering the outer layer of these end terminations is a lead-tin or tin (lead free) alloy. fig 1. consctruction of chip-r wr04 http://www..net/ datasheet pdf - http://www..net/
walsin technology corporation page 3 of 7 WR04X version 12 jul.-2004 quick reference data item general specification series no. size code WR04X 0402 ( 1005 ) resistance tolerance 5% (e24 series) 1% (e96 series), resistance range 1 ? ~ 10m ? ( 5% ), jumper (0 ? )10 ? ~ 1m ? ( 1% ) tcr (ppm/ c) r 1m ? 1m ? > r 10 ? r < 10 ? -300ppm/ c ~ +500 ppm/ c 200 ppm/ c -300ppm/ c ~ +500 ppm/ c 200 ppm/ c max. dissipation at t amb =70 c 1/16 w max. operation voltage (dc or rms) 50v max. overload voltage (dc or rms) 100v climatic category (iec 60068) 55/155/56 note : 1. this is the maximum voltage that may be continuously supplied to the resistor element, see ?iec publication 60115-8? 2. max. operation voltage : so called rcwv (rated continuous working voltage) is determined by value resistance power rated rcwv = or max. rcwv listed above, whichever is lower. 3. for resistance range 1 ? ~10 ? and 1m ? ~10m ? of tolerance 1% series no. is wr04w, please refer to specification respectively. dimensions: WR04X l 1.00 0.05 w 0.50 0.05 t 0.35 0.05 tb 0.25 0.10 tt 0.20 0.10 marking wr04 has no marking on the product overcoat for both 5% & 1%. protec tive c oat re sist ive la ye r end termination ceramic substrate t tb tt t w l http://www..net/ datasheet pdf - http://www..net/
walsin technology corporation page 4 of 7 WR04X version 12 jul.-2004 functional description product characterization standard values of nominal resistance are taken from the e24 series for resistors with a tolerance of 5%, and e96 series for resistors with a tolerance of 1%. the values of the e24/e96 series are in accordance with ?iec publication 60063? derating the power that the resistor can dissipate depends on the operating temperature; see fig.2 figure 2. maximum dissipation in percentage of rated power as a function of the ambient temperature catalogue numbers the resistors have a catalogue number starting with : wr04 x 3742 j t _ size code wr04 : 0402 type code x : normal w : out of resistance range (1% of 1 ? ~ 10 ? , 1m ? ~ 10m ? ) resistance code e24 : 2 significant digits followed by no. of zeros and a blank 4.7 ? =4r7_ 10 ? =100_ 220 ? =221_ jumper =000_ (?_? means a blank) e96 : 3 significant digits followed by no. of zeros 102 ? =1020 37.4k ? =3742 tolerance f : 1% j : 5% p : jumper packaging code t : 7? reeled taping b : bulk termination code _ = snpb base (?_? means a blank) l = sn base (lead free) 1. reeled tape packaging : 8mm width paper taping 10,000pcs per reel. 2. bulk packaging : 10,000pcs per poly-bag http://www..net/ datasheet pdf - http://www..net/
walsin technology corporation page 5 of 7 WR04X version 12 jul.-2004 mounting due to their rectangular shapes and small tolerances, surface mountable resistors are suitable for handling by automatic placement systems. chip placement can be on ceramic substrates and printed-circuit boards (pcbs). electrical connection to the circuit is by individual soldering condition. the end terminations guarantee a reliable contact. soldering condition the robust construction of chip resistors allows them to be completely immersed in a solder bath of 260 c for one minute. therefore, it is possible to mount surface mount resistors on one side of a pcb and other discrete components on the reverse (mixed pcbs). surface mount resistors are tested for solderability at 230 c during 2 seconds. the test condition for no leaching is 260 c for 60 seconds. typical examples of soldering processes that provide reliable joints without any damage are given in fig 3. fig 3. infrared soldering profile for chip resistors WR04X test condition for jumper (0 ? ) item WR04X power rating at 70 c 1/16w resistance max. 50m ? rated current 1a peak current 1.5a operating temperature -55~155 c http://www..net/ datasheet pdf - http://www..net/
walsin technology corporation page 6 of 7 WR04X version 12 jul.-2004 test and requirements requirement test procedure resistor jumper dc resistance dc resistance values measured at the test voltages specified below : <10 ? @0.1v, <100 ? @0.3v, <1k ? @1.0v, <10k ? @3v, <100k ? @10v, <1m ? @25v, <10m ? @30v within the specified tolerance < 50m ? temperature coefficient of resistance ( tcr ) natural resistance change per change in degree centigrade. () 6 1 2 1 1 2 10 ? ? t t r r r (ppm/ c) r 1 : resistance at reference temperature r 2 : resistance at test temperature t 1 : 25 c test temperature ?55~+155 c 1m ? , -300~+500ppm/ c 10 ? , ? 200ppm/ c <10 ? -300~+500ppm/ c n/a short time overload ( stol ) permanent resistance change after a 5second application of a voltage 2.5 times rcwv or the maximum overload voltage specified in the above list, whichever is less. ? r/r max. (2%+0.10 ? ) < 50m ? resistance to soldering heat unmounted chips 10 1 seconds, 270 5 o c no visible damage ? r/r max. (1% + 0.10 ? ) no visible damage, < 50m ? solderability termination snpb base : unmounted chips completely immersed for 2 0.5 sec. in a solder bath at 230 5 o c termination sn base (lead free) : unmounted chip completely immersed in a lead free solder bath, 245 c 5 c, 3 1 sec good tinning (>95% covered) no visible damage temperature cycling 1. 30 minutes at -55 c 3 c, 2. 2~3 minutes at room temperature, 3. 30 minutes at +155 3 c, 4. 2~3 minutes at room temperature, total 5 continuous cycles no visible damage ? r/r max. (1% + 0.10 ? ) no visible damage, < 50m ? load life (endurance) 70 2 o c, 1000 hours, loaded with rcwv or vmax,1.5 hours on and 0.5 hours off 10 ? ~1m ? (3% + 0.1 ? ) <10 ? or 1m ? (5% + 0.1 ? ) < 50m ? load life in humidity 1000 hours, at rated continuous working voltage in humidity chamber controller at 40 c 2 c and 90~95% relative humidity, 1.5hours on and 0.5 hours off 10 ? ~1m ? (3% + 0.1 ? ) <10 ? or 1m ? (5% + 0.1 ? ) < 50m ? bending and termination strength resistors mounted on a 90mm glass epoxy resin pcb(fr4); bending : 5 mm, once for 10seconds pulling test : 500grams no visible damage ? r/r max. (1% + 0.10 ? ) no visible damage, < 50m ? http://www..net/ datasheet pdf - http://www..net/
walsin technology corporation page 7 of 7 WR04X version 12 jul.-2004 packaging paper tape specifications (unit :mm) series no. a b w f e WR04X 1.20 0.10 0.7 0.10 8.00 0.20 3.50 0.05 1.75 0.10 series no. p1 p0 d t WR04X 2.00 0.10 4.00 0.10 1 . 0 0 . 0 50 . 1 + ? 0.40 0.05 reel dimensions symbol a b c d (unit : mm) 178.0 2.0 60.0 1.0 13.0 0.2 9.0 0.5 taping quantity and tape material - chip resistors 10,000 pcs/reel, paper tape. http://www..net/ datasheet pdf - http://www..net/
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