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Page 1 of 8 WK12-20-25L_V_AUTO_V01 FEB - 2017 WK12L, WK20L, WK25L 1%, 5% Thick Film Power Chip Resistor Wide Termination RoHS compliant and Halogen free Size 0612, 1020, 1225 Automotive AEC Q200 Compliant ASTM B-809-95 Compliant *Contents in this sheet are subject to change without prior notice.
Page 2 of 8 WK12-20-25L_V_AUTO_V01 FEB - 2017 FEATURE 1. High power rating and compact size 2. High reliability and stability 3. Reduced size of final equipment 4. RoHS compliant and Halogen free products 5. AEC Q200 Compliant 6. ASTM B-809-95 60’C 1000hrs compliant 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 r esistive layer is covered with a protective coat. Finally, the two external end terminations are added at longer sides. For ease of soldering the outer layer of these end terminations is Tin (lead free) alloy. Fig 2. Construction of Chip-R
Page 3 of 8 WK12-20-25L_V_AUTO_V01 FEB - 2017 QUICK REFERENCE DATA Item General Specification Series No. WK12L WK20L WK25L Size code 0612(1632) 1020 ( 2550 ), 1225(3264) Resistance Tolerance 5% (E24); 1% (E24+E96) Resistance Range 1 ~ 1M, TCR (ppm/C) : 200 ppm/C 200 ppm/C 200 ppm/C Max. dissipation at Tamb=70C 3/4W 1 W 2W Max. Operation Voltage (DC or RMS) 200V 200V 200V Max. Overload Voltage (DC or RMS) 400V 400V 400V 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 ValueResistancePower RatedRCWV or Max. RCWV listed above, whichever is lower. MECHANICAL DATA (unit : mm) TYPE WK12L WK20L WK25L
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 8 WK12-20-25L_V_AUTO_V01 FEB - 2017 SOLDERING CONDITION The robust construction of chip resistors allows them to be completely immersed i n 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 Fig 4. Fig 4. Infrared soldering profile for Chip Resistors CATALOGUE NUMBERS The resistors have a catalogue number starting with . WK12 L 472_ J T L V Size code WK25 : 1225 WK20 : 1020 WK12: 0612 Type code L : wide termination 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 Termination code L = Sn base (lead free) Special code V = AEC Q200 Compliant + ASTM B-809-
95 Compliant
Page 6 of 8 WK12-20-25L_V_AUTO_V01 FEB - 2017 TEST AND REQUIREMENTS ( AEC Q200 )
Page 7 of 8 WK12-20-25L_V_AUTO_V01 FEB - 2017
Page 8 of 8 WK12-20-25L_V_AUTO_V01 FEB - 2017 PACKAGING Tape specifications (unit :mm) Type A B W F E Type P1 P0 D T WK12L 1.0 0.050.1 Max 1.0 WK20L 1.10±0.15 WK25L Reel dimensions (unit : mm) Symbol A B C D Taping quantity WK20L, WK25L by plastic tape taping 4,000 pcs per 7” reel! WK12L by paper tape taping 5,000 pcs per 7” reel!