Walsin Technology Corporation WF12H, WF08H, WF06H, WF04H 0.5% High precision chip resistors Size 1206, 0805, 0603, 0402 Customer : Approval No : Issue Date : Customer Approval : Page 1 of 8 WFxxHD 0.5% Version 09 Nov.-2006 Walsin Technology Corporation FEATURE 1. Small size and light weight 2. High reliability and stability 3. Reduced size of final equipment 4. High precision 5. Higher component and equipment reliability APPLICATION * Power supply * PDA * Digital meter * Computer * Palmtop computers 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 paste that is applied to the top surface of the substrate. The composition of the paste 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 ease of soldering the outer layer of these end terminations is a Lead-tin or Tin (lead free) alloy. Fig 1. Consctruction of Chip-R Page 2 of 8 WFxxHD 0.5% Version 09 Nov.-2006 Walsin Technology Corporation QUICK REFERENCE DATA Item General Specification Series No. WF12H WF08H WF06H WF04H Size code 1206 (3216) 0805 (2125) 0603 (1608) 0402 (1005) 10 ~ 1M ( E96+E24 series) Tolerance 0.5% Resistance Range TCR (ppm/C) 10 R 1M 100 ppm/C 1/8 W 200 ppm/C Max. dissipation at Tamb=70C 1/4 W Max. Operation Voltage (DC or RMS) 200V 150V 50V 50V Max. overload voltage (DC or RMS) 400V 300V 100V 100V Climatic category (IEC 60068) 1/10 W 1/16W 55/155/56 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. 3. Non E96 series resistance upon requested. DIMENSIONS Part No WF12H WF08H WF06H WF04H L 3.10 0.1 2.0 0.10 1.60 0.10 1.000.05 W 1.60 0.1 1.25 0.10 0.80 0.10 0.500.05 Tt 0.50 0.2 0.40 0.20 0.30 0.10 0.200.10 Tb 0.45 0.2 0.40 0.20 0.30 0.20 0.250.10 t 0.65 0.15 0.5 0.15 0.45 0.15 0.350.05 MARKING WFxxH 0.5% 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 3-digits marking for 0603 size No marking code for 0402 size Page 3 of 8 WFxxHD 0.5% Version 09 Nov.-2006 Walsin Technology Corporation FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of 0.5%. 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 The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260C 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 235C during 2 seconds. The test condition for no leaching is 260C for 60 seconds. Typical examples of soldering processes that provide reliable joints without any damage are given in Fig 3. Page 4 of 8 WFxxHD 0.5% Version 09 Nov.-2006 Walsin Technology Corporation Fig 3. Infrared soldering profile for Chip Resistors CATALOGUE NUMBERS The resistors have a catalogue number starting with : WF06 H 3742 B T _ Size code Type code Resistance code Tolerance Packaging code Termination code WF12 : 1206 E96 +E24: B : 0.1% T WF08 : 0805 H : High precision, <1%, TCR>50ppm D : 0.5% WF06 : 0603 3 significant digits followed by no. of zeros _ = SnPb base ("_" means a blank) WF04 : 0402 Reeled tape packaging 0402. 102 =1020 37.4K =3742 220 =2200 : 7" Reeled taping L = Sn base (lead free) : 8mm width paper taping 5000pcs per 7" reel for 1206/0805/0603, 10000pcs per 7" reel for TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) TEST PROCEDURE REQUIREMENT DC resistance DC resistance values measured at the test voltages specified below : Clause 4.5 <10@0.1V, <100@0.3V, <1K@1.0V, <10K@3V, <100K@10V, <1M@25V, Temperature Coefficient of Resistance(T.C.R) Clause 4.8 Within the specified tolerance <10M@30V Natural resistance change per change in degree centigrade. R2 - R1 x 106 R1 (t2 - t1 ) Refer to "QUICK REFERENCE DATA" (ppm/C) ; t1 : 20C+5C-1C R1 : Resistance at reference temperature R2 : Resistance at test temperature Short time overload (S.T.O.L) Clause 4.13 Resistance to soldering heat(R.S.H) Permanent resistance change after a 5second application of a voltage 2.5 R/R max. (2%+0.10) times RCWV or the maximum overload voltage specified in the above list, whichever is less. Un-mounted chips completely immersed for 101second in a solder bath at 270 no visible damage 5C R/R max. (1%+0.05) Clause 4.18 Solderability Clause 4.17 Leach Test Clause 4.18 Un-mounted chips completely immersed for 20.5second in a solder bath at good tinning (>95% covered) 2355 no visible damage Un-mounted chips completely immersed for 601second in a solder bath at 260 Ditto 5 Temperature cycling 30 minutes at -55C3C, 2~3 minutes at 20C+5C-1C, 30 minutes at no visible damage +155C3C, 2~3 minutes at 20C+5C-1C, total 5 continuous cycles R/R max. (1%+0.05) Clause 4.19 Load life (endurance) 702C, 1000 hours, loaded with RCWV or Vmax,1.5 hours on and 0.5 hours R/R max. (3%+0.1) off Clause 4.25 Page 5 of 8 WFxxHD 0.5% Version 09 Nov.-2006 Walsin Technology Corporation TEST Load life in Humidity Clause 4.24 PROCEDURE REQUIREMENT 1000 hours, at rated continuous working voltage in humidity chamber controller R/R max. (3%+0.1) 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); bending : 3 mm, R/R max. (1%+0.05) once for 10 seconds Adhesion Pressurizing force: 5N, Test time: 101sec. Bending strength No remarkable damage or removal of the terminations. Clause 4.32 Page 6 of 8 WFxxHD 0.5% Version 09 Nov.-2006 Walsin Technology Corporation PACKAGING Paper Tape specifications (unit :mm) Series No. A B W F E WF12H 3.600.20 2.000.20 8.000.30 3.500.2 1.750.10 WF08H 2.400.20 1.650.20 8.000.30 3.500.2 1.750.10 WF06H 1.900.20 1.100.20 8.000.30 3.500.2 1.750.10 WF04H 1.200.10 0.70.10 8.000.20 3.500.05 1.750.10 Series No. P1 P0 D T WF12H 4.000.10 4.000.10 WF08H 4.000.10 4.000.10 WF06H 4.000.10 4.000.10 WF04H 2.000.10 4.000.10 0.650.1 0.650.1 1.50 +-00..10 0.650.1 0.400.05 Reel dimensions Symbol A B C D (unit : mm) 178.02.0 60.01.0 13.00.2 9.00.5 Taping quantity Page 7 of 8 WFxxHD 0.5% Version 09 Nov.-2006 Walsin Technology Corporation - Chip resistors 5,000 pcs/reel for WF12H, WF08H, WF06H. Chip resistors 10,000 pcs/reel for WF04H. Page 8 of 8 WFxxHD 0.5% Version 09 Nov.-2006