Walsin Technology Corporation 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 : Page 1 of 9 WFxxT Ver.8 Sep.2008 Walsin Technology Corporation 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 WFxxU Page 2 of 9 WFxxT Ver.8 Sep.2008 Walsin Technology Corporation QUICK REFERENCE DATA Item General Specification Series No. WF12T WF08T WF06T WF04T Size code 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) 0402 ( 1005 ) 0.5%, 0.25%, 0.1% Resistance Tolerance Resistance Range 10 ~ 1M ( E24 +E96 ) 10 ~ 1M ( E24 +E96 ) TCR (ppm/C) 10 ~ 330K ( E24 +E96 ) 10 ~ 100K ( E24 +E96 ) +50 ~ -50 ppm/C Max. dissipation at Tamb=70C 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 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 RCWV = Rated Power x Resistance Value 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 t End termination B Resistive layer A Ceramic Substrate W T 1001 L Page 3 of 9 WFxxT Ver.8 Sep.2008 Walsin Technology Corporation 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 resistance value. For values below 976 the R is used as a digit. For values of 100 or greater, the first 3 digits are significant, the fourth digit indicates the number of multiple to follow. Example RESISTANCE 10 12 100 6800 47000 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 from the E96 & E24 series for resistors with a tolerance of 0.5%, 0.25%, 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. SOLDERING CONDITION Page 4 of 9 WFxxT Ver.8 Sep.2008 Walsin Technology Corporation The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260C 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 245C during 3 seconds within lead-free solder bath. The test condition for no leaching is 260C for 30 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 xxx D T Size code Type code Resistance code Tolerance Packaging code WF12: 1206 T: TCR 50ppm E96 +E24: D : 0.5% T : Reeled WF08: 0805 R is first code followed by C: 0.25% WF06: 0603 3 significant digits. B : 0.1% E24: 39R0=>390 WF04: 0402 820R =>821 E96: 17R8 =>25X 178R =>25A 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) Page 5 of 9 WFxxT Ver.8 Sep.2008 Walsin Technology Corporation TEST PROCEDURE REQUIREMENT Resistor DC resistance DC resistance values measured Clause 4.5 <10@0.1V, <100@0.3V, <1K@1.0V, Within the specified tolerance 0.5%, 0.25%, 0.1% <10K@3V, <100K@10V,<1M@25V, <10M@30V Temperature Coefficient of Resistance(T.C.R) Clause 4.8 Natural resistance change per change in degree centigrade. R2 - R1 x 106 R1 (t2 - t1 ) Test temperature -55C ~ +125C TCR: 50 ppm/C (ppm/C) R1 : Resistance at reference temperature R2 : Resistance at test temperature t1 : 20C+5C-1C Short time overload (S.T.O.L) Clause 4.13 Resistance to soldering heat(R.S.H) IEC 60068-2-58:2004 Solderability IEC 60068-2-58:2004 Temperature cycling Permanent resistance change after a 5second application of a R/R max. (0.2%+0.05) voltage 2.5 times RCWV or the maximum overload voltage specified in the above list, whichever is less. Un-mounted chips completely immersed for 101second in a no visible damage SAC solder bath at 2555C R/R max. (0.1%+0.05) Un-mounted chips completely immersed for 30.3 second in a good tinning (>95% covered) SAC solder bath at 2455 no visible damage no visible damage Clause 4.19 30 minutes at -55C3C, 2~3 minutes at 20C+5C-1C, 30 minutes at +125C3C, 2~3 minutes at 20C+5C-1C, total 5 continuous cycles Load life (endurance) 1000 +48/-0 hours, loaded with RCWV or Vmax in chamber R/R max. (0.5%+0.05) controller 702C, 1.5 hours on and 0.5 hours off Clause 4.25 Load life in Humidity Clause 4.24 R/R max. (0.1%+0.05) 1000 +48/-0 hours, loaded with RCWV or Vmax in humidity R/R max. (0.5%+0.05) chamber controller at 40C2C and 90~95% relative humidity, 1.5hours on and 0.5 hours off Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4); R/R max. (0.1%+0.05) bending : 3 mm, once for 10 seconds. Adhision Pressurizing force: 5N, Test time: 101sec. Clause 4.32 Insulation Resistance No remarkable damage or removal of the terminations. Apply the maximum overload voltage (DC) for 1minute R10G Apply the maximum overload voltage (AC) for 1 minute No breakdown or flashover Bending strength JISC5201-1:1998 Clause 4.6 Dielectric Withstand Voltage JISC5201-1:1998 Clause 4.7 Page 6 of 9 WFxxT Ver.8 Sep.2008 Walsin Technology Corporation PACKAGING Paper Tape specifications (unit :mm) P0 F D Series No. A B W D E WF12 3.600.20 2.000.20 8.000.30 3.500.20 1.750.10 WF08 2.400.20 1.650.20 8.000.30 3.500.20 1.750.10 WF06 1.900.20 1.100.20 8.000.30 3.500.20 1.750.10 WF04 1.200.10 0.70.10 8.000.20 3.500.05 1.750.10 Series No. F P0 D T WF12 4.000.10 4.000.10 1.50 +-00..10 Max. 1.0 WF08 4.000.10 4.000.10 1.50 +-00..10 Max. 1.0 WF06 4.000.10 4.000.10 1.50 +-00..10 0.650.05 WF04 2.000.10 4.000.10 1.50 +-00..10 0.400.05 Reel dimensions B C A D Page 7 of 9 Symbol A B C D (unit : mm) 178.02.0 60.01.0 13.00.2 9.00.5 WFxxT Ver.8 Sep.2008 Walsin Technology Corporation Taping quantity - Chip resistors 5,000 pcs per reel ( WF12T, WF08T, WF06T ) Chip resistors 10,000 pcs per reel ( WF04T ) Page 8 of 9 WFxxT Ver.8 Sep.2008