poe international corp m01-00-e-07 specification of high precision thin film chip resistor ver: 1 page: 1 of 8 r r r o o o h h h s s s c c c o o o m m m p p p l l l i i i a a a n n n c c c e e e wf12t, wf08t, wf06t, wf04t 0.5%, 0.1% tc50 high precision thin film chip resistors size 1206, 0805, 0603, 0402
poe international corp m01-00-e-07 specification of high precision thin film chip resistor ver: 1 page: 2 of 8 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 ceramic body (aluminum oxide). internal metal electrodes are added at each end and connected by a resistive layer that is applied to the top surface of the substrate. the composition of the resistive layer 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 environmental soldering issue, the outer layer of these end terminations is a lead-free solder . fig 1. consctruction of chip-r wfxxt
poe international corp m01-00-e-07 specification of high precision thin film chip resistor ver: 1 page: 3 of 8 quick reference data item general specification series no. wf12t wf08t wf06t wf04t size code 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) 0402 ( 1005 ) resistance tolerance 0.5%, 0.1% resistance range 4.7 w ~ 1m w ( e24 +e96 ) 4.7 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 (iec 60068) 55/125/56 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. 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 0.60 0.15 0.50 0.15 0.45 0.15 0.35 0.05 b 0.45 0.20 0.40 0.20 0.30 0.20 0.25 0.10 t 0.50 0.20 0.40 0.20 0.30 0.20 0.20 0.10 protective coat resistive layer end termination ceramic substrate t b a t w l 1001
poe international corp m01-00-e-07 specification of high precision thin film chip resistor ver: 1 page: 4 of 8 marking each resistor is marked with a three digits code on the protective coating to designate the nominal resistance value. wf04t has no marking! example: e24 serious 1% 39r0 => 390 820r =>821 e96 serious 1% 17r8 =>25x 178r => 25a functional description product characterization standard values of nominal resistance are taken from the e96 & e24 series for resistors with a tolerance of 0. 5%, 0. 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 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.
poe international corp m01-00-e-07 specification of high precision thin film chip resistor ver: 1 page: 5 of 8 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 245 c during 3 seconds within lead-free solder bath. 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. catalogue numbers the resistors have a catalogue number starting with . wf06 t xxxx b t _ size code wf12 : 1206 wf08 : 0805 wf06 : 0603 wf04 : 0402 type code t :tcr 50ppm resistance code e96 +e24: 4 significant digits. e24: 39r0=>39r0 820r =>8200 e96: 17r8 =>17r8 178r =>1780 tolerance b : 0.1% d : 0.5% 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. 5,000pcs/reel for wf12t, wf08t, wf06t; 10,000pcs/reel for wf04t.
poe international corp m01-00-e-07 specification of high precision thin film chip resistor ver: 1 page: 6 of 8 test and requirements test procedure requirement resistor dc resistance dc resistance values measured at the test voltages specified below : within the specified tolerance 0.5% & 0.1% resistance <100 w <1k w <10k w test voltage 0.3v 1.0v 3.0v resistance <100k w <1m w <10m w test voltage 10v 25v 50v 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 C 55 c ~ +125 c tcr: Q 50 ppm/ c 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. d r/r max. (0.1%+0.05 w ) resistance to soldering heat unmounted chips 10 1 seconds, 260 5 o c no visible damage d r/r max. (0.1% + 0.05 w ) solderability unmounted chips completely immersed for 3 1sec. in a lead-free solder bath at 245 5 o c 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 d r/r max. (0.1% + 0.05 w ) load life (endurance) 70 2 o c, 1000 hours, loaded with rcwv or vmax,1.5 hours on and 0.5 hours off d r/r max. (0.5% + 0.05 w ) 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 d r/r max. (0.5% + 0.05 w ) bending and termination strength resistors mounted on a 90mm glass epoxy resin pcb(fr4); bending : 3 mm, once for 10 seconds pulling test : 500grams d r/r max. (0.1% + 0.05 w )
poe international corp m01-00-e-07 specification of high precision thin film chip resistor ver: 1 page: 7 of 8 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
poe international corp m01-00-e-07 specification of high precision thin film chip resistor ver: 1 page: 8 of 8 taping quantity - chip resistors 5,000 pcs per reel ( wf12t, wf08t, wf06t ) - chip resistors 10,000 pcs per reel ( wf04t )
|
