WK04K820RFAL

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Page 1 of 7 ASC_WKxxK_V07 NOV- 2015 WK12K, W K08K, WK06K, W K04K, WK02K Thick Film TC50/TC100 High Precision Thick Film chip resistors Size 1206, 0805, 0603, 0402, 0201

Page 2 of 7 ASC_WKxxK_V07 NOV- 2015 FEATURE 1. SMD Thick film resistor 2. High reliability and stability 3. High performance of TCR: 50 ppm/K 4. High precision 5. RoHS compliant & Lead free APPLICATION

• Medical equipment
• Measuring instrument
• Communication device
• Computer
• Printer

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 layer that is applied to the top surface of the substrate. The composition of the resistive layer 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 environmental soldering issue, the outer layer of these end terminations is a Lead-free solder . Fig 1. Construction of Chip-R WKxxK

Page 3 of 7 ASC_WKxxK_V07 NOV- 2015 QUICK REFERENCE DATA Item General Specification Series No. WK12K WK08K WK06K WK04K WK02K Size code 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) 0402 ( 1005 ) 0201 ( 0603 ) Resistance Tolerance ±1.0%, ±0.5% ( E24 +E96 ) Resistance Range/ TCR (ppm/ °C) 3.3 ~ 9.76 Ω : 50ppm 10 Ω ~ 4.7M Ω : 50ppm- 3.3 ~ 9.76 Ω : 50ppm 10 Ω ~ 3.3M Ω : 50ppm 3.3 ~ 9.76 Ω : 100ppm 10 ~ 97.6 Ω : 100ppm 100 Ω ~ 1M Ω : 50ppm 1.02~3.3M Ω : 100ppm 10 ~ 97.6 Ω : 100ppm 100 Ω ~ 1M Ω : 50ppm 1.02~3.3M Ω : 100ppm 51 ~ 976 Ω : 100ppm 1K Ω ~ 1M Ω : 50ppm Max. dissipation at T amb =70 °C 1/4W 1/8W 1/10W 1/16W 1/20W Max. Operation Voltage (DC or RMS) 200V 150V 50V 50V 25V Max. Overload Voltage (DC or RMS) 400V 300V 100V 100V 50V Climatic category 55/125/56 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 Value Resistance Power Rated RCWV ×= or Max. RCWV listed above, whichever is lower. 3. Green color overcoat. DIMENSION (unit : mm) Type WK12K WK08K WK06K WK04K WK02K Protective coat Resistive layer End termination Ceramic Substrate t B A T W L 1001 101

nominal resistance value of E24 and E96. ±1.0%, ±0.5%. The values of the E24/E96 series are in accordance with “IEC publication 60063”. Figure 2. Maximum dissipation in percentage of rated power 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 ASC_WKxxK_V07 NOV- 2015 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 within lead-free solder bath. 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. CATALOGUE NUMBERS The resistors have a catalogue number starting with . WK12 K 4990 D T L Size code WK12: 1206 WK08: 0805 WK06: 0603 WK04: 0402 WK02: 0201 Type code TCR 50ppm/100ppm Resistance code E24 +E96: First 3 significant digits represent resistance code and followed by number of zero. E24: 39R0=>39R0 820R =>8200 E96: 49R9 =>49R9 499R =>4990 Tolerance F : ±1.0% D : ±0.5% Packaging code T : 7” Reeled A : 7” Reeled 15kpcs Termination code L : lead free 1. Reeled tape packaging: 8mm width paper taping. 5,000pcs/reel for WK12, WK08, WK06; 10,000pcs/reel for WK04, 15,000pcs/reel for WK02

Page 6 of 7 ASC_WKxxK_V07 NOV- 2015 TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) REQUIREMENT TEST PROCEDURE Resistor DC resistance Clause 4.5 DC resistance values measured <10K Ω @3V, <100K Ω @10V,<1M Ω @25V, <10M Ω @30V Within the specified tolerance Temperature Coefficient of Resistance(T.C.R) Clause 4.8 Natural resistance change per change in degree centigrade. ( ) 12 1 12 10 ×− ttR RR (ppm/ °C) R 1 : Resistance at reference temperature R 2 : Resistance at test temperature Refer to “QUICK REFERENCE DATA” Short time overload (S.T.O.L) Clause 4.13 Permanent resistance change after a 2 second application of a voltage 2.5 times RCWV or the maximum overload voltage specified in the above list, whichever is less. ΔR/R max. ±(1.0%+0.05 Ω ) 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 Δ R/R max. ±(1.0 % +0.05 Ω ) Solderability Clause 4.17 Un-mounted chips completely immersed 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 -55 °C ±3°C, 2~3 minutes at 20° C+5° C-1° C, 30 minutes at +125°C ±3°C, 2~3 minutes at 20° C+5° C-1° C, total 5 continuous cycles no visible damage ΔR/R max. ±(1.0 % +0.05 Ω ) Load life (endurance) Clause 4.25 70 ±2ºC, 1000 hours, loaded with RCWV or Vmax,1.5 hours on and 0.5 hours off ΔR/R max. ±(5.0%+0.1Ω ) No visual damage Load life in Humidity Clause 4.24 1000 hours, at rated continuous working voltage in humidity chamber controller at 40 °C ±2°C and 95% relative humidity, 1.5hours on and 0.5 hours off ΔR/R max. ±(5.0%+0.1Ω ) No visual damage Endurance at high temperature Clause 4.25 125 °C, no load, 1000hours ΔR/R max. ±(5.0%+0.1Ω ) No visual damage Bending strength Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4); bending : 3 mm, once for 10 seconds. ΔR/R max. ±(1.0%+0.05 Ω ) 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 ≧1G Ω Dielectric Withstand Voltage Clause 4.7 Apply the maximum overload voltage (AC) for 1 minute No breakdown or flashover

Page 7 of 7 ASC_WKxxK_V07 NOV- 2015 PACKAGING Paper Tape specifications (unit :mm) F P0 D Series No. A B W D E Series No. F P0 Φ D T 0 . 050 . 1+ Φ Max. 1.0 0 . 050 . 1+ Φ Max. 1.0 0 . 050 . 1+ Φ Max. 0.8 0 . 050 . 1+ Φ Max. 0.5 0 . 050 . 1+ Φ Max. 0.5 Reel dimensions ABC D Symbol A B C D Taping quantity - Chip resistors 5,000 pcs per reel ( WK12, WK08, WK06 ) - Chip resistors 10,000 pcs per reel ( WK04 ); 15,000pcs per reel (WK02)