walsin technology corporation page 1 of 9 wfxxt ver.8 sep.2008 wf12t, wf08t, wf06t, wf04t 0.5%, 0.25%, 0.1% tc50 high precision thin film chip resistors size 1206, 0805, 0603, 0402 customer : approval no : issue date : customer approval :
walsin technology corporation page 2 of 9 wfxxt ver.8 sep.2008 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 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
walsin technology corporation page 3 of 9 wfxxt ver.8 sep.2008 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 0.5%, 0.25%, 0.1% 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 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
walsin technology corporation page 4 of 9 wfxxt ver.8 sep.2008 marking 3-digits marking for 0603 size wfxxt has same marking rule as wrxx 1%. 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 functional description product characterization standard values of nominal resistance are taken fro m the e96 & e24 series for resistors with a toleran ce of 0.5%, 0.25%, 0.1%. the values of the e24/e96 series are in accor dance 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. soldering condition
walsin technology corporation page 5 of 9 wfxxt ver.8 sep.2008 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 245 c during 3 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 size code wf12: 1206 wf08: 0805 wf06: 0603 wf04: 0402 type code t: tcr 50ppm resistance code e96 +e24: r is first code followed by 3 significant digits. e24: 39r0=>390 820r =>821 e96: 17r8 =>25x 178r =>25a tolerance d : 0.5% c: 0.25% b : 0.1% packaging code t : reeled 1. reeled tape packaging: 8mm width paper taping. 5,000pcs/reel for wf12t, wf08t, wf06t; 10,000pcs/reel for wf04t. test and requirements(jis c 5201-1 : 1998)
walsin technology corporation page 6 of 9 wfxxt ver.8 sep.2008 requirement test procedure resistor dc resistance clause 4.5 dc resistance values measured <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 0.5%, 0.25%, 0.1% 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 test temperature C55 c ~ +125 c tcr: Q 50 ppm/ c 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 volta ge specified in the above list, whichever is less. d r/r max. (0.2%+0.05 w ) resistance to soldering heat(r.s.h) iec 60068-2-58:2004 un-mounted chips completely immersed for 10 1second in a sac solder bath at 255 5 o c no visible damage d r/r max. (0.1% + 0.05 w ) solderability iec 60068-2-58:2004 un-mounted chips completely immersed for 30.3 seco nd in a sac solder bath at 245 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 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
walsin technology corporation page 7 of 9 wfxxt ver.8 sep.2008 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
walsin technology corporation page 8 of 9 wfxxt ver.8 sep.2008 taping quantity - chip resistors 5,000 pcs per reel ( wf12t, wf08t , wf06t ) - chip resistors 10,000 pcs per reel ( wf04t )
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