page 1 of 8 wfxxt ver .10 april.2010 wf12t, wf08t, wf06t, wf04t 1.0%, 0.5%, 0.25%, 0.1%, 0.05% tc50 high precision thin film chip resistors size 1206, 0805, 0603, 0402 customer : approval no : issue date : customer approval :
page 2 of 8 wfxxt ver .10 april.2010 feature 1. smd metal film resistor 2. high reliability and stability of 0.1% and below per customer request 3. high performance of tcr: 50 ppm/k and below per customer request 4. low current noise 5. +/-0.05% is upon the customer request. application medical equipment measuring instrument communication device computer printer 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 laye r that is applied to the top surface of the substra te. the composition of the resistive layer is adjusted to g ive the approximate resistance required and the val ue is trimmed to nominated value within tolerance which c ontrolled by laser trimming of this resistive layer . the resistive layer is covered with a protective co at. finally, the two external end terminations are added. for environmental soldering issue, the outer layer of t hese end terminations is a lead-free solder . fig 1. consctruction of chip-r wfxxu
page 3 of 8 wfxxt ver .10 april.2010 quick reference data item general specification series no. wf12t wf08t wf06t wf04t size code 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) 0402 ( 10 05 ) resistance tolerance 1.0%, 0.5%, 0.25%, 0.1%, 0.05% resistance range 10 w ~ 1m w ( e24 +e96 ) 10 w ~ 1m w ( e24 +e96 ) 10 w ~ 330k w ( e24 +e96 ) 10 w ~ 100k w ( e24 +e96 ) tcr (ppm/ c) +50 ~ -50 ppm/ c max. dissipation at t amb =70 c 1/8w 1/10w 1/16w 1/16w max. operation voltage (dc or rms) 150v 100v 50v 25v max. overload voltage (dc or rms) 300v 200v 100v 50v climatic category 55/125/56 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. dimensions: type wf12t wf08t wf06t wf04t 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 a 0.45 0.20 0.25 0.20 0.25 0.15 0.20 0.10 b 0.45 0.20 0.40 0.20 0.30 0.15 0.25 0.10 t 0.60 0.15 0.50 0.15 0.45 0.15 0.35 0.05 protective coat resistive layer end termination ceramic substrate t b a t w l 1001
page 4 of 8 wfxxt ver .10 april.2010 marking 3-digits marking for 0603 size wfxxt has same marking rule as wrxx 1%. 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 for 1206, 0805 size each resistor is marked with a four digits code on the protective coating to designate the nominal res istance value. for values below 97 w 6 the r is used as a digit. for values of 100 w or greater, the first 3 digits are significant, the fourth digit indicates the number of multiple to follow. example resistance 10 w 12 w 100 w 6800 w 47000 w 4-digits marking 10r0 12r0 1000 6801 4702 no marking code for 0402 size
page 5 of 8 wfxxt ver .10 april.2010 functional description product characterization standard values of nominal resistance are taken fro m the e96 & e24 series for resistors with a toleran ce of 1%, 0.5%, 0.25%, 0.1%, 0.05%. the values of the e24/e96 series are in acco rdance 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 rate d power as a function of the ambient temperature 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.
page 6 of 8 wfxxt ver .10 april.2010 soldering condition the robust construction of chip resistors allows th em to be completely immersed in a solder bath of 26 0 c for 10 seconds. therefore, it is possible to mount surface mount resistors on one side of a pcb and other dis crete components on the reverse (mixed pcbs). surface mount resistors are tested for solderabilit y at 235 c during 2 seconds within lead-free solder bath. th e test condition for no leaching is 260 c for 30 seconds. typical examples of soldering pro cesses that provide reliable joints without any damage are given in fig 3. catalogue numbers the resistors have a catalogue number starting with . wf06 t xxx d t l size code wf12: 1206 wf08: 0805 wf06: 0603 wf04: 0402 type code t: tcr 50ppm resistance code e96 +e24: 3 significant digits followed by no. of zeros 102 w =1020 37.4k w =3742 220 w =2200 tolerance f : 1.0% d : 0.5% c: 0.25% b : 0.1% a : 0.05% packaging code t : reeled termination code l = sn base (lead free) 1. reeled tape packaging: 8mm width paper taping. 5,000pcs/reel for wf12t, wf08t, wf06t; 10,000pcs/reel for wf04t.
page 7 of 8 wfxxt ver .10 april.2010 test and requirements(jis c 5201-1 : 1998) requirement test procedure resistor dc resistance clause 4.5 dc resistance values measured at the test voltages specified below : <10 w @0.1v, <100 w @0.3v, <1k w @1.0v, <10k w @3v, <100k w @10v,<1m w @25v, <10m w @30v within the specified tolerance temperature coefficient of resistance(t.c.r) clause 4.8 natural resistance change per change in degree cent igrade. ( ) 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 : 20c+5c-1c refer to quick reference data short time overload (s.t.o.l) clause 4.13 permanent resistance change after a 5second applicat ion of a voltage 2.5 times rcwv or the maximum overload voltage speci fied in the above list, whichever is less. d r/r max. (0.2%+0.05 w ) resistance to soldering heat(r.s.h) clause 4.18 un-mounted chips completely immersed for 10 1second in a sac solder bath at 260 5 o c no visible damage d r/r max. (0.1% + 0.05 w ) solderability clause 4.17 un-mounted chips completely immersed for 20.5 seco nd in a sac solder bath at 235 5 good tinning (>95% covered) no visible damage temperature cycling clause 4.19 30 minutes at -55 c 3 c, 2~3 minutes at 20c+5c-1c, 30 minutes at +125 c 3 c, 2~3 minutes at 20c+5c-1c, total 5 continuous cycles no visible damage d r/r max. (0.1% + 0.05 w ) load life (endurance) clause 4.25 1000 +48/-0 hours, loaded with rcwv or vmax in chambe r controller 70 2 o c, 1.5 hours on and 0.5 hours off d r/r max. (0.5% + 0.05 w ) load life in humidity 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 d r/r max. (0.5% + 0.05 w ) bending strength clause 4.33 resistors mounted on a 90mm glass epoxy resin pcb(fr4 ); bending : 3 mm, once for 10 seconds. d r/r max. (0.1% + 0.05 w ) adhision clause 4.32 pressurizing force: 5n, test time: 10 1sec. no remarkable damage or removal of the terminations. insulation resistance clause 4.6 apply the maximum overload voltage (dc) for 1minute r R 10g dielectric withstand voltage clause 4.7 apply the maximum overload voltage (ac) for 1 minute no breakdown or flashover
page 8 of 8 wfxxt ver .10 april.2010 packaging paper tape specifications (unit :mm) f p0 d series no. a b w d e wf12 3.60 0.20 2.00 0.20 8.00 0.30 3.50 0.20 1.75 0.10 wf08 2.40 0.20 1.65 0.20 8.00 0.30 3.50 0.20 1.75 0.10 wf06 1.90 0.20 1.10 0.20 8.00 0.30 3.50 0.20 1.75 0.10 wf04 1.20 0.10 0.7 0.10 8.00 0.20 3.50 0.05 1.75 0.10 series no. f p0 f d t wf12 4.00 0.10 4.00 0.10 1.0 0.0 50.1 +- f max. 1.0 wf08 4.00 0.10 4.00 0.10 1.0 0.0 50.1 +- f max. 1.0 wf06 4.00 0.10 4.00 0.10 1.0 0.0 50.1 +- f 0.65 0.05 wf04 2.00 0.10 4.00 0.10 1.0 0.0 50.1 +- f 0.40 0.05 reel dimensions a b c d 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 taping quantity - chip resistors 5,000 pcs per reel ( wf12t, wf08t , wf06t ) - chip resistors 10,000 pcs per reel ( wf04t )
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