WF12S2R2JTL

WF25S, WF20S, WF12S, WF08S, WF06S ±5%, ±10%, ±20% Power Surge Chip Resistors Size 2512 , 2010 , 1206 , 0805 , 0603 Page 1 of 7 WFxxS_V07 Jan.2011 FEATURE 1. Power rating and compact size 2. High reliability and stability 3. Reduced size of final equipment 4. Surge protection APPLICATION • Power supply • Measurement instrument • Automotive industry • Medical or Military equipment DESCRIPTION The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal 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 request resistance to nominal value within tolerance which controlled by printing process in 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 Tin (Pb free) alloy. Fig 1. Consctruction of Chip-R Page 2 of 7 WFxxS_V07 Jan.2011 QUICK REFERENCE DATA Item General Specification Series No. WF25S WF20S WF12S WF08S WF06S Size code 2512(6432 ) 2010 (5025) 1206 ( 3216 ) 0805 (2012) 0603 (1608) ±5% ±10% ±20% (E24) Resistance Tolerance Resistance Range 1Ω ~ 1MΩ ± 100 ppm /°C TCR (ppm/°C) Max. dissipation at Tamb=70°C 1W 1/2W 1/4W 1/8W 1/10 W Max. Operation Voltage (DC or RMS) 200V 200V 200V 150V 50V Max. Overload Voltage (DC or RMS) 400V 400V 400V 300V 100V 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 × Resistance Value or Max. RCWV listed above, whichever is lower. MECHANICAL DATA(unit : mm) Symbol WF25S WF20S WF12S WF08S WF06S L 6.30±0.20 5.00±0.20 3.10±0.15 2.00±0.15 1.60 ± 0.10 W 3.10±0.20 2.50±0.20 1.60±0.15 1.20±0.15 0.80 ± 0.10 T 0.60±0.15 0.60±0.10 0.55±0.10 0.50±0.10 0.45 ± 0.15 Tt 0.60±0.25 0.60±0.25 0.50±0.25 0.40±0.20 0.30 ± 0.15 Tb 0.60±0.25 0.60±0.25 0.50±0.25 0.40±0.20 0.30 ± 0.10 Page 3 of 7 WFxxS_V07 Jan.2011 MARKING 1. Each resistor is marked with a three-digit code on the protective coating to designate the nominal resistance value. 2. Surge Resistor is prints underline on three-digit code for identification Example: 472 472 = 4700Ω Surge Performance WFxxS series 10000 1000 Peak power (Watt) 2512 2010 100 1206 0805 10 0603 1 .001 1ms .01 .1 10ms 100ms 1 1s Surge duration De-rating curve The power that the resistor can dissipate depends on the operating temperature; see Fig.2 Page 4 of 7 WFxxS_V07 Jan.2011 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 260°C 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 235°C during 2 seconds. The test condition for no leaching is 260°C 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 WFxxS CATALOGUE NUMBERS The resistors have a catalogue number starting with . WF20 S Size code Type code Resistance code Tolerance Packaging code Termination code WF25 : 2512 S : surge E24 : 3 significant digits followed by no. of zeros and a blank J: ±5% T : 7” Reeled taping L = Sn base (lead free) WF20 : 2010 WF12 : 1206 472_ 472 = 4K7 J K: ±10% T L M: ±20% WF08 : 0805 WF06 : 0603 Page 5 of 7 WFxxS_V07 Jan.2011 TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) TEST Temperature Coefficient of Resistance(T.C.R) Clause 4.8 PROCEDURE Natural resistance change per change in degree centigrade. R2 − R1 × 106 R1 (t2 − t1 ) (ppm/°C) REQUIREMENT Refer to “QUICK REFERENCE DATA” t1 : 20°C+5°C-1°C 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 ∆R/R max. ±(1%+0.1Ω) a voltage 2.5 times RCWV or the maximum overload voltage specified in the above list, whichever is less. Resistance to soldering heat(R.S.H) Clause 4.18 Un-mounted chips completely immersed for 10±1second in a no visible damage solder bath at 260℃±5ºC ∆ R/R max. ±(1%+0.05Ω) Solderability Clause Clause 4.17 Un-mounted chips completely immersed for 2±0.5second in good tinning (>95% covered) a solder bath at 235℃±5℃ no visible damage Temperature cycling 30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes at +155°C±3°C, 2~3 minutes at 20°C+5°C-1°C, total 5 cycles Clause 4.19 Load life (endurance) Clause 4.25 no visible damage ∆R/R max. ±(1%+0.05Ω) 70±2ºC, 1000 hours, loaded with RCWV or Vmax,1.5 hours ∆R/R max. ±(3%+0.1Ω) on and 0.5 hours off Clause 4.24 1000 hours, at rated continuous working voltage in humidity ∆R/R max. ±(3%+0.1Ω) chamber controller at 40°C±2°C and 90~95% relative humidity, 1.5hours on and 0.5 hours off Bending strength Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4); ∆R/R max. ±(1%+0.05Ω) bending : 2 mm, once for 10 seconds Adhesion Pressurizing force: 5N, Test time: 10±1sec. No remarkable damage or removal of the terminations Insulation Resistance Apply the maximum overload voltage (DC) for 1minute R≧10GΩ Clause 4.6 Dielectric Withstand Apply the maximum overload voltage (AC) for 1 minute No breakdown or flashover Load life in Humidity Clause 4.32 Voltage Clause 4.7 Page 6 of 7 WFxxS_V07 Jan.2011 PACKAGING Plastic Tape specifications (unit :mm) Series No. A B WF25S 6.70±0.20 3.50±0.20 WF20S 5.50±0.20 2.80±0.20 WF12S 3.57±0.20 2.00±0.20 WF08S 2.40±0.20 1.65±0.20 WF06S 1.90±0.20 1.10±0.20 Series No. P1 P0 W F E 12.00±0.30 5.50±0.05 1.75±0.10 8.00±0.30 3.50±0.05 1.75±0.10 ΦD T WF25S Max. 1.2 WF20S WF12S 4.00±0.10 Φ1.50 +−00..10 4.00±0.10 Max. 1.0 WF08S 0.65±0.05 WF06S Reel dimensions Reel / Tape 7” reel for 8mm tape 7” reel for 12mm tape A B C Φ178.0±2.0 Φ60.0±1.0 13.0±0.2 D 9.00±0.50 12.4±1.00 Taping quantity -1206 0805 0603 Chip resistors 5,000 pcs per reel. -2010 2512 Chip resistors 4,000 pcs per reel. Page 7 of 7 WFxxS_V07 Jan.2011