approval sheet page 1 of 9 asc_wr_v21 mar.- 2012 wr12, wr08, wr06, wr04 1%, 5% thick film g eneral purpose chip resistors size 1206, 0805, 0603, 0402 *contents in this sheet are subject to change witho ut prior notice.
approval sheet page 2 of 9 asc_wr_v21 mar.- 2012 feature 1. high reliability and stability 2. reduced size of final equipment 3. lower assembly costs 4. higher component and equipment reliability 5. rohs compliant and lead free products application consumer electrical equipment edp, computer application telecom application description the resistors are constructed in a high grade ceram ic body (aluminum oxide). internal metal electrodes are added at each end and connected by a resistive past e that is applied to the top surface of the substra te. the composition of the paste is adjusted to give the ap proximate resistance required and the value is trim med to within tolerance by laser cutting of this resistive layer. the resistive layer is covered with a protective co at. finally, the two external end terminations are added. for ease of soldering the outer layer of these end term inations is a tin (lead free) alloy. fig 1. construction of chip-r
approval sheet page 3 of 9 asc_wr_v21 mar.- 2012 quick reference data item general specification series no. wr12 wr08 wr06 wr04 size code 1206(3216) 0805(2012) 0603(1608) 0402(1005 ) resistance range 1 w ~10m w ( 5% tolerance), jumper 1 w ~10m w ( 1% tolerance), resistance tolerance 1% e96/e24 5% e24 1% e96/e24 5% e24 1% e96/e24 5% e24 1% e96/e24 5% e24 tcr (ppm/ c) 10m w 3 r 10 w r 10 w 100 -200~+400 max. dissipation @ t amb =70 c 1/4 w 1/8 w 1/10 w 1/16 w max. operation voltage (dc or rms) 200v 150v 50v 50v max. overload voltage (dc or rms) 400v 300v 100v 100v climatic category 55/155/56 note : 1. this is the maximum voltage that may be continuo usly supplied to the resistor element, see iec publ ication 60115-8 2. max. operation voltage : so called rcwv (rated cont inuous working voltage) is determined by value resistance power rated rcwv = or max. rcwv listed above, whichever is lower. 3. the resistance of jumper is defined <0.05 w . dimensions (unit : mm) wr12 wr08 wr06 wr04 l 3.10 0.10 2.00 0.10 1.60 0.10 1.00 0.05 w 1.60 0.10 1.25 0.10 0.80 0.10 0.50 0.05 t 0.60 0.15 0.50 0.15 0.45 0.15 0.35 0.05 tb 0.45 0.20 0.40 0.20 0.30 0.15 0.25 0.10 tt 0.50 0.20 0.40 0.20 0.30 0.10 0.20 0.10
approval sheet page 4 of 9 asc_wr_v21 mar.- 2012 marking size \ nr. of digit of code\tolerance 5% 1% 1206 (3216) 3-digits marking 4-digits marking 0805 (2012) 3-digits marking 4-digits marking 0603 (1608) 3-digits marking 3-digits marking 0402(1005) n0 marking 3-digits marking 5% : 1206 & 0805 & 0603 each resistor is marked with a three digits code on the protective coating to designate the nominal res istance value. 3-digits marking 1% : 0603 nominal resistance description 1.e-24 series as 0603 wr06x 5%. 2.e-96 series the 1st two digit codes are referring to the code o n the table, the 3rd code is the index of resistanc e value : y=10 -2 x=10 -1 a=10 0 b=10 1 c=10 2 d=10 3 e=10 4 f=10 5 ex : 17.8 =25x 178 =25a 1k78 =25b 17k8=25c 178k=25d 1m78=25e 3. remark there is no marking for the items are not under e-24 and e-96 series code r_value code r_value code r_value code r_value code r_value code r_value code r_value code r_value 01 100 13 133 25 178 37 237 49 316 61 422 73 562 85 750 02 102 14 137 26 182 38 243 50 324 62 432 74 576 86 768 03 105 15 140 27 187 39 249 51 332 63 442 75 590 87 787 04 107 16 143 28 191 40 255 52 340 64 453 76 604 88 806 05 110 17 147 29 196 41 261 53 348 65 464 77 619 89 825 06 113 18 150 30 200 42 267 54 357 66 475 78 634 90 845 07 115 19 154 31 205 43 274 55 365 67 487 79 649 91 866 08 118 20 158 32 210 44 280 56 374 68 499 80 665 92 887 09 121 21 162 33 215 45 287 57 383 69 511 81 681 93 909 10 124 22 165 34 221 46 294 58 392 70 523 82 698 94 931 11 127 23 169 35 226 47 301 59 402 71 536 83 715 95 953 12 130 24 174 36 232 48 309 60 412 72 549 84 732 96 976 4-digits marking 1% : 1206/0805 each resistor is marked with a four digits code on t he protective coating to designate the nominal resi stance value. example resistance 10 w 12 w 100 w 6800 w 47000 w 3-digits marking 1206 & 0805 & 0603 5% 100 120 101 682 473 4-digits marking 10r0 12r0 1000 6801 4702
approval sheet page 5 of 9 asc_wr_v21 mar.- 2012 functional description product characterization standard values of nominal resistance are taken fro m 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 accorda nce with iec publication 60063 derating the power that the resistor can dissipate depends o n the operating temperature; see fig.2 figure 2 maximum dissipation in percentage of rated power as a function of the ambient temperature for wr12, wr08 , wr06, wr04 mounting due to their rectangular shapes and small tolerance s, surface mountable resistors are suitable for han dling by automatic placement systems. chip placement can be on ceramic substrates and pri nted-circuit boards (pcbs). electrical connection to the circuit is by individu al soldering condition. the end terminations guarantee a reliable contact.
approval sheet page 6 of 9 asc_wr_v21 mar.- 2012 soldering condition the robust construction of chip resistors allows them to be completely immersed in a solder bath of 260 c for 10 seconds. 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 235 c during 2 seconds. the test condition for no leaching is 260 c for 30 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 resistor s catalogue numbers the resistors have a catalogue number starting with wr12 x 472_ j t l size code wr12 : 1206 wr08 : 0805 wr06 : 0603 wr04: 0402 type code x : 5%, 1 w ~ 10m w 1%, 10 w ~ 1m w w : 1%, < 10 w ; >1m w resistance code 5%, e24: 2 significant digits followed by no. of zeros and a blank 4.7 w =4r7_ 10 w =100_ 220 w =221_ jumper =000_ (_ means a blank) 1%, e24+e96: 3 significant digits followed by no. of zeros 102 w =1020 37.4k w =3742 tolerance f : 1% j : 5% p : jumper packaging code t : 7 reeled taping q : 10 reeled taping g : 13 reeled taping h : 13'' reel 50kpcs only for 0402 b : bulk d : 7'' reel 20kpcs only for 0402 a : 7" reel 15kpcs only for 0402 termination code l = sn base (lead free) wr12, wr08, wr06: 1. reeled tape packaging : 8mm width paper tapin g 5000pcs per 7 reel, 10kpcs per 10 reel, 20kpcs per 13 reel. 2. bulk packaging : 5000pcs per poly-bag wr04: 1. reeled tape packaging : 8mm width paper tapin g 10,000pcs per reel, 2. bulk packaging : 10,000pcs per poly-bag
approval sheet page 7 of 9 asc_wr_v21 mar.- 2012 test and requirements essentially all tests are carried out according to the schedule of iec publication 115-8, category lct / uct /56(rated temperature range : l ower c ategory t emperature, u pper c ategory t emperature; damp heat, long term, 56 days). the testing also meets t he requirements specified by eia, eiaj and jis. the tests are carried out in accordance with iec pu blication 68, "recommended basic climatic and mecha nical robustness testing procedure for electronic compone nts" and under standard atmospheric conditions acco rding to iec 60068-1, subclause 5.3. unless otherwise spe cified, the following value supplied : temperature: 15 c to 35 c. relative humidity: 45% to 75%. air pressure: 86kpa to 106 kpa (860 mbar to 1060 mb ar). all soldering tests are performed with midly activa ted flux. requirement test procedure / test method resistor 0 w ww w electrical characteristics jisc5201-1: 1998 clause 4.8 - dc resistance values measurement - temperature coefficient of resistance (t.c.r) natural resistance change per change in degree cent igrade. ( ) 6 1 21 1 2 10 - - t t r r r (ppm/ c) t 1 : 20c+5c-1c r 1 : resistance at reference temperature (20c+5c/-1 c) r 2 : resistance at test temperature (-55c or +155c) within the specified tolerance refer to quick reference data <50m w resistance to soldering heat(r.s.h) jisc5201-1:1998 clause 4.18 un-mounted chips completely immersed for 10 1second in a sac solder bath at 260 5 o c 5%: d r/rmax. (1%+0.05 w ) 1%: d r/rmax. (0.5%+0.05 w ) no visible damage <50m w solderability jisc5201-1: 1998 clause 4.17 un-mounted chips completely immersed for 20.5 seco nd in a sac solder bath at 235 5 95% coverage min., good tinning and no visible damage temperature cycling jisc5201-1: 1998 clause 4.19 30 minutes at -55 c 3 c, 2~3 minutes at 20c+5c-1c, 30 minutes at +155 c 3 c, 2~3 minutes at 20c+5c-1c, total 5 continuous cycles 5%: d r/r max. (1%+0.05 w ) 1%: d r/rmax. (0.5%+0.05 w ) no visible damage <50m w high temperature exposure mil-std-202 method 108 1000+48/-0 hours; without load in a temperature cha mber controlled 155 3 c 5%: d r/rmax. (2%+0.1 w ) 1%: d r/rmax. (1%+0.1 w ) no visible damage <50m w bending strength jisc5201-1: 1998 clause 4.33 resistors mounted on a 90mm glass epoxy resin pcb(fr4 ), bending once 3mm for 10sec, 5mm for wr04 5%: d r/rmax. (1%+0.05 w ) 1%: d r/rmax. (1%+0.05 w ) no visual damaged <50m w adhesion jisc5201-1: 1998 clause 4.32 pressurizing force: 5n, test time: 10 1sec. no remarkable damage or removal of the terminations short time overload (stol) jisc5201-1: 1998 clause 4.13 2.5 times rcwv or max. overload voltage, for 5second s 5%: d r/r max. (2%+0.05 w ) 1%: d r/r max. (1%+0.05 w ) no visible damage <50m w
approval sheet page 8 of 9 asc_wr_v21 mar.- 2012 requirement test procedure / test method resistor 0 w ww w load life in humidity jisc5201-1: 1998 clause 4.24 1000 +48/-0 hours, loaded with rcwv or vmax in humidi ty chamber controller at 40 c 2 c and 90~95% relative humidity, 1.5hours on and 0.5 hours off 5%: d r/r max. (2%+0.1 w ) 1%: d r/r max. (1%+0.1 w ) no visible damage <50m w load life (endurance) jisc5201-1: 1998 clause 4.25 1000 +48/-0 hours, loaded with rcwv or vmax in chamber controller 70 2 o c, 1.5 hours on and 0.5 hours off 5%: d r/r max. (3%+0.1 w ) 1%: d r/r max. (1%+0.1 w ) no visible damage <50m w insulation resistance jisc5201-1: 1998 clause 4.6 apply the maximum overload voltage (dc) for 1minute r R 10g dielectric withstand voltage jisc5201-1: 1998 clause 4.7 apply the maximum overload voltage (ac) for 1 minute no breakdown or flashover test condition for jumper (0 w ww w ) item wr12 wr08 wr06 wr04 power rating at 70 c 1/4w 1/8w 1/10w 1/16w resistance max.50m w rated current 2a 1.5a 1a 1a peak current 5a 3.5a 3a 2a operating temperature -55 ~ +155 c
approval sheet page 9 of 9 asc_wr_v21 mar.- 2012 packaging paper tape specifications (unit :mm) series no. a b w f e wr12 3.60 0.20 2.00 0.20 wr08 2.40 0.20 1.65 0.20 wr06 1.90 0.20 1.10 0.20 wr04 1.20 0.10 0.70 0.10 8.00 0.30 3.50 0.20 1.75 0.10 series no. p1 p0 f d t wr12 / wr08 max. 1.0 wr06 4.00 0.10 0.65 0.05 wr04 2.00 0.10 4.00 0.10 1.0 0.0 50.1 +- f 0.40 0.05 7 reel dimensions symbol a b c d (unit : mm) f 178.0 2.0 f 60.0 1.0 13.0 0.2 9.0 0.5
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