WR18X WALSIN | Alldatasheet
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Page 1 of 7 WR18-20-25X(W)_V17 DEC - 2016 WR18X(W), WR20X(W), WR25X(W) 1%, 5% Thick Film Power Chip Resistors Size 1218,2010,2512 *Contents in this sheet are subject to change without prior notice.
Page 2 of 7 WR18-20-25X(W)_V17 DEC - 2016 FEATURE 1. High power rating and compact size 2. High reliability and stability 3. Reduced size of final equipment 4. RoHS compliant and Lead free products 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 Tin (lead free) alloy. Fig 1. Construction of 2512, 2010 Chip-R Fig 2. Construction of a 1218 Chip-R
Page 3 of 7 WR18-20-25X(W)_V17 DEC - 2016 QUICK REFERENCE DATA Item General Specification Series No. WR18X(W) WR20X(W) WR25X(W) Size code 1218(3248) 2010 ( 5025 ), 2512(6432) Resistance Tolerance 5% (E24); 1% (E24+E96) Resistance Range 1 ~ 10M, Jumper (0) TCR (ppm/C) : 10< Rn 10M 1 Rn 10 100 ppm/C 100 ppm/C 100 ppm/C 200 ppm/C 200 ppm/C 200 ppm/C Max. dissipation at Tamb=70C 1W 0.75 W 1W Max. Operation Voltage (DC or RMS) 200V 200V 250V Max. Overload Voltage (DC or RMS) 400V 400V 500V Operation temperature -55 ~ +155’C Storage temperature 5 ~ 40’C Test conditions for jumper ( 0 ohm ) Type WR18X(W) WR20X(W) WR25X(W) Power Rating At 70C 1 W 3/4 W 1 W Resistance Max. 50mR Max. 50mR Max. 50mR Rated Current 4.5 A 3.8 A 4.5 A Peak Current 11 A 9 A 11 A Operating Temperature -55C ~ 155C -55C ~ 155C -55C ~ 155C Note : 1. This is the maximum voltage that may be continuous ly 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. 3. Max. Operation Current : So called RCWC (Rated Continuous Working Current) is determined by Value Resistance/Power RatedRCWC MECHANICAL DATA (unit : mm) TYPE WR18 WR20 WR25
5% & 1%. The values of the E24/E96 series are in accordance with “IEC publication 60063”. Figure 3. Maximum dissipation in percentage of rated power as a function of the ambient temperature. 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.
Page 5 of 7 WR18-20-25X(W)_V17 DEC - 2016 SOLDERING CONDITION The robust construction of chip resistors allows them to be completely im mersed 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 235C 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 below. CATALOGUE NUMBERS The resistors have a catalogue number starting with . WR20 X 472_ J T L Size code WR25 : 2512 WR20 : 2010 WR18: 1218 Type code X : 5%: 1-10M 1%: 10-1M W : 1% : <10 or >1M Resistance code 5% E24 : 2 significant digits followed by no. of zeros and a blank 4.7 =4R7_ 10 =100_ 1% E24+E96: 3 significant digits followed by no. of zeros 102 =1020 37.4K =3742 Tolerance J : 5% F : 1% P : Jumper Packaging code T : 7” Reel taping (T:1218 10” Reel) Q : 10” Reel taping G : 13” Reel taping Termination code L = Sn base (lead free) 3-5 sec
Page 6 of 7 WR18-20-25X(W)_V17 DEC - 2016 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 st andard atmospheric 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 DC resistance Clause 4.5 DC resistance values measured at the test voltages specified below : Within the specified tolerance 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) t1 : 20°C+5°C-1°C R1 : Resistance at reference temperature R2 : Resistance at test temperature Refer to “QUICK REFERENCE DATA” Short time overload (S.T.O.L) Clause 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 is less. R/R max. ±(2%+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 im mersed for 2±0.5 second in a SAC solder bath at 235℃±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 +155 C3C, 2~3 minutes at 20°C+5°C-1°C, total 5 con tinuous cycles no visible damage 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 R/R max. (3%+0.1) Load life in Humidity Clause 4.24 1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber controller at 40C2C and 90~95% relative humidity, 1.5hours on and 0.5 hours off R/R max. (3%+0.1) Bending strength Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4); bending : 2 mm, once for 10 seconds Adhesion Clause 4.32 Pressurizing force: 5N, Test time: 10±1sec. No remarkable damage or removal of the terminations Insulation Resistance Clause 4.6 Apply the maximum overload voltage (DC) for 1minute R≧10GΩ Dielectric Withstand Voltage Clause 4.7 Apply the maximum overload voltage (AC) for 1 minute No breakdown or flashover
Page 7 of 7 WR18-20-25X(W)_V17 DEC - 2016 PACKAGING Plastic Tape specifications (unit :mm) Type A B W F E WR18 4.90±0.20 3.55±0.30 WR25 6.90±0.20 3.60±0.20 Type P1 P0 D T WR18 8.00±0.10 4.00±0.10 1.0 0.050.1 1.30±0.20 WR20 4.00±0.10 MAX1.2 WR25 Reel dimensions (unit : mm) Symbol A B C D Taping quantity WR20, WR25 by plastic tape taping 4,000 pcs per 7” reel; 8,000pcs per 10” reel; 16,000pcs per 13” reel ! WR18 by plastic tape taping 3,000 pcs per 10” reel