WF25N WALSIN | Alldatasheet
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Page 1 of 9 WFxxN_V01 FEB 2017 WF25N, WF20N, WF12N, WF08N, WF06N 1%, 5% Thick Film High Voltage Chip Resistors UL Safety Certification Size 2512,2010,1206, 0805, 0603
Page 2 of 9 WFxxN_V01 FEB 2017 FEATURE 1. Special materials and design for higher working voltage required. 2. Compatible with flow and reflow soldering. 3. Suitable for lead free soldering. 4. Max. Voltage coefficient resistance below 300ppm. 5. RoHS compliant & Halogen Free. 6. Safety resistor certificate meet： - UL/IEC 60950-1 2.5 kV impulse. - UL/IEC 60065 10 kV impulse. APPLICATION Power supply Measurement instrument Back light inverter Medical or Military equipment
DESCRIPTION
The resistors are constructed in a high grade ceramic body (aluminum oxide). Inte rnal 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 Tin (lead free) alloy. Fig 1. Construction of Chip-R
Page 3 of 9 WFxxN_V01 FEB 2017 QUICK REFERENCE DATA 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 ValueResistancePower RatedRCWV or Max. RCWV listed above, whichever is lower. MECHANICAL DATA Symbol WF25N WF 20N WF12N WF08N WF06N L 6.40 0.20 5.00 0.20 3.10 0.10 2.00 0.10 1.60 0.10 W 3.20 0.20 2.50 0.20 1.60 0.10 1.25 0.10 0.80 0.10 T 0.60 0.15 0.60 0.10 0.55 0.10 0.50 0.10 0.45 0.10 Tt 0.65 0.25 0.65 0.25 0.50 0.20 0.40 0.20 0.30 0.20 Tb 0.90 0.25 0.60 0.25 0.50 0.20 0.40 0.20 0.30 0.20 105 WF06N WF08N WF12N WF20N WF25N
Page 4 of 9 WFxxN_V01 FEB 2017 MARKING For E24 5% series, each resistor is marked with a three –digit code on the protective coating to designate the nominal resistance value. For E24/E96 1% series, each resistor is marked with a four–digit code on the protective coating to designate the nominal resistance value. 0603 is marked with three-digits. FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E24/E96 series for resistors with a tolerance of 1%, 5%. The values of the E24/E96 series are in accordance with “IEC publication 60063”.
Page 5 of 9 WFxxN_V01 FEB 2017 Derating curve 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 WF06N WF08N WF12N WF20N WF25N
Page 6 of 9 WFxxN_V01 FEB 2017 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 possib le 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 te st 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 CATALOGUE NUMBERS The resistors have a catalogue number starting with . WF25 N 105 J T L Size code WF25 : 2512 WF20 : 2010 WF12 : 1206 WF08 : 0805 WF06 : 0603 Type code N :High Voltage UL certified Resistance code 5% E24 : 2 significant digits followed by no. of zeros and a blank
1 M = 105
1%, E24+E96: 3 significant digits followed by no. of zeros
1 M = 1004
J : 5% F : 1% Packaging code T : 7” inch reel 0603/0805/1206: paper tape, 5kpcs/reel 2010,2512 : plastic tape, 4kpcs/reel Termination code L = Sn base (lead free) Tape packaging WF12, WF08, WF06 : 8mm width paper taping 5,000pcs per reel. WF25；WF20: 12mm width plastic taping 4,000pcs per reel.
Page 7 of 9 WFxxN_V01 FEB 2017 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 atmospher ic conditions according to IEC 60068-1, subclause 5.3. Unless otherwise specified, the following value supplied : Temperature: 15°C to 35°C. 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. TEST PROCEDURE REQUIREMENT Temperature Coefficient of Resistance(T.C.R) Clause 4.8 Natural resistance change per change in degree centigrade. 121 12 10 ttR RR (ppm/C) R1 : Resistance at reference temperature R2 : Resistance at test temperature t1 : 20°C+5°C-1°C Refer to “QUICK REFERENCE DATA” Short time overload (S.T.O.L) Clause 4.13 Permanent resistance change after a 5 second application of 5 times of rated power. No visible damage J: R/R max. (2%+0.1) F: R/R max. (1%+0.1) Resistance to soldering heat(R.S.H) Clause 4.18 Un-mounted chips completely immersed for 10±1second in a SAC solder bath at 260℃±5ºC no visible damage Solderability Clause 4.17 Un-mounted chips completely immersed for 3±0.5second in a SAC solder bath at 245℃±5℃ good tinning (>95% covered) no visible damage Temperature cycling Clause 4.19 30 minutes at -55C3C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes at +155C3C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous cycles no visible damage R/R max. ±(1%+0.1) Load life (endurance) Clause 4.25 1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller 70±2ºC, 1.5 hours on and 0.5 hours off no visible damage J: R/R max. (3%+0.1) F: R/R max. (1%+0.1) Load life in Humidity Clause 4.24 1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber controller at 40 C2C and 95% relative humidi ty, 1.5hours on and 0.5 hours off no visible damage J: R/R max. (3%+0.1) F: R/R max. (1%+0.1) Bending strength Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4), 2512, 2010, 1206 bending : 2 mm once for 10 seconds 0805, 0603 bending: 3mm once for 10 seconds Insulation Resistance Clause 4.6 Apply voltage 100+/-15V for 1minute R≧1GΩ
Page 8 of 9 WFxxN_V01 FEB 2017 PACKAGING Paper Tape specifications (unit :mm) Series No. A B W F E WF25N 6.70±0.20 3.50±0.20 WF20N 5.50±0.20 2.80±0.20 Series No. P1 P0 D T WF25N 1.0 0.050.1 Max. 1.2 WF20N WF12N Max. 1.0 WF08N WF06N 0.65±0.10 Reel dimensions (unit : mm) Reel / Tape A B C D 7” reel for 12mm tape 12.4±1.0 7” reel for 8mm tape 9.0±0.5
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