Walsin Technology Corporation WW18X 1%, 5% Low ohmic power chip resistors Size 1218 Customer : Approval No : Issue Date : Customer Approval : Page 1 of 7 WW18X Version 10 Jun.-2009 Walsin Technology Corporation FEATURE 1. High power rating and compact size 2. High reliability and stability 3. Reduced size of final equipment 4. Lead free termination upon customer requested APPLICATION * Power supply * PDA * Digital meter * Computer * Automotives * Battery charger * DC-DC power converter 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. Construction of a 1218 Chip-R Page 2 of 7 WW18X Version 10 Jun.-2009 Walsin Technology Corporation QUICK REFERENCE DATA Item General Specification Series No. WW18X Size code 1218(3248) Resistance Tolerance Resistance Range 5% (E24) 1% (E96) 0.02 ~ 0.91 0.02 ~ 0.976 TCR (ppm/C) 0.02 Rn < 0.05 1500 ppm/C 0.05 Rn < 0.10 1000 ppm/C 0.10 Rn < 0.50 500 ppm/C 0.50 Rn < 1 300 ppm/C Max. dissipation at Tamb=70C 1W Max. Operation Voltage (DC or RMS) 200V Climatic category (IEC 60068) 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. Tolerance of TCR=200ppm/C 4. Resistance value will be changed by soldering condition and design of soldering pad,please design products in consideration of this change of resistance value. MECHANICAL DATA Symbol Dimensions (mm) L 3.050.15 W 4.600.20 T 0.550.10 Tt 0.450.25 Tb 0.500.25 MARKING Each resistor is marked with a four-digit code on the protective coating to designate the nominal resistance value. Example: R010 = 0.01 ,R510 = 0.51 Page 3 of 7 WW18X Version 10 Jun.-2009 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 5% & 1%. The values of the E24/E96 series are in accordance with "IEC publication 60063". Derating curve The power that the resistor can dissipate depends on the operating temperature; see Fig.2 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 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. 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. Fig 3. Infrared soldering profile for Chip Resistors WW18X Page 4 of 7 WW18X Version 10 Jun.-2009 Walsin Technology Corporation CATALOGUE NUMBERS The resistors have a catalogue number starting with . WW18 X R100 J T Size code Type code Resistance code - 4 digits Tolerance Packaging code WW18: 1218 X : Thick film, R100 = 0.1 OHM J: 5% R976 = 0.976 OHM F: 1% T: 10" Reeled taping L Termination code L = Sn base (lead free) Reeled tape packaging : paper taping 3000pcs per 10" reel. TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) Essentially all tests are carried out according to the schedule of IEC publication 115-8, category LCT/UCT/56(rated temperature range : Lower Category Temperature, Upper Category Temperature; damp heat, long term, 56 days). The testing also meets the requirements specified by EIA, EIAJ and JIS. The tests are carried out in accordance with IEC publication 68, "Recommended basic climatic and mechanical robustness testing procedure for electronic components" and under standard atmospheric conditions according to IEC 60068-1, subclause 5.3. Unless otherwise specified, the following value supplied : Temperature: 15C to 35C. Relative humidity: 45% to 75%. Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar). All soldering tests are performed with midly activated flux. Page 5 of 7 WW18X Version 10 Jun.-2009 Walsin Technology Corporation TEST Temperature Coefficient of Resistance(T.C.R) Clause 4.8 PROCEDURE REQUIREMENT 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 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 R/R max. (2%+0.005) is less. Resistance to soldering heat(R.S.H) Un-mounted chips completely immersed for 101second in a SAC solder bath no visible damage at 2555C R/R max. (1%+0.005) IEC 60068-2-58: 2004 Solderability IEC 60068-2-58: 2004 Temperature cycling Clause 4.19 Load life (endurance) Clause 4.25 Load life in Humidity Clause 4.24 Un-mounted chips completely immersed for 30.3second in a SAC solder bath good tinning (>95% covered) at 2455 no visible damage 30 minutes at -55C3C, 2~3 minutes at 20C+5C-1C, 30 minutes at +155C3C, 2~3 minutes at 20C+5C-1C, total 5 continuous cycles no visible damage R/R max. (1%+0.005) 1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller 702C, R/R max. (3%+0.005) 1.5 hours on and 0.5 hours off 1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber controller R/R max. (3%+0.005) 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 : 2 mm, R/R max. (1%+0.005) once for 10 seconds Adhesion Pressurizing force: 5N, Test time: 101sec. Clause 4.32 Insulation Resistance Apply the maximum overload voltage (DC) for 1minutes Bending strength No remarkable damage or removal of the terminations JISC5201-1:1998 Clause 4.6 Dielectric Withstand R10G Apply the maximum overload voltage (AC) for 1 minutes Voltage No breakdown or flashover JISC5201-1:1998 Clause 4.7 Page 6 of 7 WW18X Version 10 Jun.-2009 Walsin Technology Corporation PACKAGING Plastic Tape specifications (unit :mm) Symbol Ao Bo W F E Dimensions 3.550.30 4.900.20 12.000.20 5.500.05 1.750.10 Symbol P1 P0 D T Dimensions 8.000.10 8.000.10 1.55 +-00..10 1.300.20 Reel dimensions Symbol A B C D (unit : mm) 178.02.0 60.01.0 13.00.2 14.00.2 Taping quantity - Chip resistors 3,000 pcs per reel. Page 7 of 7 WW18X Version 10 Jun.-2009 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Walsin: WW18XR402FT