WR20 WALSIN | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 7
Technical content
Page 1 of 7 WR20, WR25 ( Automotive )_V02 J an.2011 WR20, WR25 General purpose chip resistors Size 2010, 2512 ( Automotive )
Page 2 of 7 WR20, WR25 ( Automotive )_V02 J an.2011 FEATURE 1. Automotive grade AEC Q-200 compliant 2. 100% CCD inspection 3. RoHS compliant and Lead free products APPLICATION
- Automotive application
- Consumer electrical equipment
- EDP, Computer application
- Telecom application
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 within tolerance by laser cutting 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 2512, 2010 Chip-R
Page 3 of 7 WR20, WR25 ( Automotive )_V02 J an.2011 QUICK REFERENCE DATA Item General Specification Series No. WR20 WR25 Size code 2010 ( 5025 ), 2512(6432) Resistance Tolerance ±5% (E24); ±1% (E24+E96) Resistance Range 1Ω ~ 10M Ω , Jumper (0 Ω ) ± 200 ppm/ °C ± 200 ppm/ °C ± 100 ppm/ °C ± 100 ppm/ °C TCR (ppm/ °C) R ≦ 10 Ω 10 Ω < R ≦1M Ω > 1M Ω ± 200 ppm/ °C ± 200 ppm/ °C Max. dissipation at T amb =70 °C 0.5 W 1W Max. Operation Voltage (DC or RMS) 200V 250V Max. Overload Voltage (DC or RMS) 400V 500V 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 Value Resistance Power Rated RCWV ×= or Max. RCWV listed above, whichever is lower. 3. The resistance of Jumper is defined <0.05 Ω . DIMENSIONS (unit : mm) TYPE WR20 WR25 Tt 0.65 ±0.25 0.65 ±0.25
Page 4 of 7 WR20, WR25 ( Automotive )_V02 J an.2011 MARKING 2512, 2010 4-digits marking 4-digits marking FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of ±5% & ±1%. The values of the E24/E96 series are in accordance with “IEC publication 60063”. Derating curve The power that the resistor can dissipate depends on the operating temperature; see Fig.2 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
Page 5 of 7 WR20, WR25 ( Automotive )_V02 J an.2011 CATALOGUE NUMBERS The resistors have a catalogue number starting with . WR25 X 472_ J T L J Size code WR25 : 2512 WR20 : 2010 Type code X : ±5%, 1R ~ 10MR ±1%, 10R ~ 1MR W : ±1%,< 10R; > 1MR Resistance code 5%, E24: 2 significant digits followed by no. of zeros 100 Ω = 101_ 10K Ω = 103 1%, E24+E96: 3 significant digits followed by no. of zeros 100Ω =1000 37.4K Ω =3742 Tolerance F : ±1% J : ±5% P : Jumper Packaging code T : 7” Reeled taping Q : 10” Reeled taping G : 13” Reeled taping B : Bulk Termination code L = Sn base (lead free) Special code J = Automotive grade and Anti-Sulfuration 10ppm x 240hrs TEST AND REQUIREMENTS Essentially all tests are carried out according to the schedule of IEC publication 115-8, category LCT /UCT /56(rated temperature range : Lower C ategory Temperature, U pper C ategory 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 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. REQUIREMENT TEST PROCEDURE / TEST METHOD Resistor 0ΩΩ ΩΩ
Electrical Characteristics
JISC5201-1: 1998 Clause 4.8 - DC resistance values measurement - Temperature Coefficient of Resistance (T.C.R) Natural resistance change per change in degree centigrade. ( ) 121 12 10 ×− ttR RR (ppm/ °C) t 1 : 20° C+5° C-1° C R 1 : Resistance at reference temperature R 2 : Resistance at test temperature Within the specified tolerance Refer to “QUICK REFERENCE DATA” <50m Ω Resistance to soldering heat(R.S.H) MIL-STD-202 method 210 Un-mounted chips completely immersed for 10 ±1second in a SAC solder bath at 270 ℃±5ºC ΔR/R max. ±(1.0%+0.05 Ω ) no visible damage <50m Ω Solderability J-STD-002 a) Bake the sample for 155 ℃ dwell time 4hrs/ solder dipping 235 ℃/ 5sec. b) Steam the sample dwell time 1 hour/ solder dipping 260 ℃/ 7sec. 95% coverage min., good tinning and no visible damage Temperature cycling JESD22 Method JA-104 1000 cycles, -55℃ ~ +155 ℃, dwell time 5~10min ΔR/R max. ±(1.0%+0.05 Ω ) No visible damage <50m Ω
Page 6 of 7 WR20, WR25 ( Automotive )_V02 J an.2011 REQUIREMENT TEST PROCEDURE / TEST METHOD Resistor 0ΩΩ ΩΩ Moisture Resistance MIL-STD-202 method 106 65 ±2°C, 80~100% RH, 10 cycles, 24 hours/ cycle ΔR/R max. ±(1.0%+0.05 Ω ) No visible damage <50m Ω Bias Humidity MIL-STD-202 method 103 1000+48/-0 hours; 85 °C, 85% RH, 10% of operation power ΔR/R max. ±(2.0%+0.10 Ω ) No visible damage <50m Ω Operational Life MIL-STD-202 method 108 1000+48/-0 hours; 35% of operation power, 125 ±2°C ΔR/R max. ±(2.0%+0.1Ω ) No visible damage <50m Ω High Temperature Exposure MIL-STD-202 Method 108 1000+48/-0 hours; without load in a temperature chamber controlled 155 ±3°C ΔR/R max. ±(2.0%+0.10 Ω ) No visible damage <50m Ω Board Flex AEC-Q200-005 Resistors mounted on a 90mm glass epoxy resin PCB(FR4),bending once 2mm for 10sec. ΔR/R max. ±(1.0%+0.05 Ω ) No visible damage <50m Ω Terminal strength AEC-Q200-006 Pressurizing force: 1Kg, Test time: 60±1sec. No remar kable damage or removal of the terminations Thermal shock MIL-STD-202 method 107 Test –55 to 155℃/ dwell time 15min/ Max transfer time 20sec 300cycles ΔR/R max. ±(1.0%+0.05 Ω ) No visible damage <50m Ω ESD AEC-Q200-002 Test contact 1.0KV ΔR/R max. ±(1.0%+0.05 Ω ) No visible damage <50m Ω Short Time Overload JISC5201-1: 1998 Clause 4.13 No visible damage <50m Ω Load life in Humidity JISC5201-1: 1998 Clause 4.24 1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber controller at 40 °C ±2°C and 90~95% relative humidity, 1.5hours on and 0.5 hours off ΔR/R max. ±(2%+0.10 Ω ) No visible damage <50m Ω Load life (endurance) JISC5201-1: 1998 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 ΔR/R max. ±(2%+0.10 Ω ) No visible damage <50m Ω TEST CONDITION FOR JUMPER (0 ΩΩ ΩΩ ) Type WR20X WR25X Power Rating At 70C 1/2 W 1 W Resistance Max. 50mR Rated Current 3.2 A 4.5 A Peak Current 8 A 11 A Operating Temperature -55C ~ 155C
Page 7 of 7 WR20, WR25 ( Automotive )_V02 J an.2011 PACKAGING Plastic Tape specifications (unit :mm) Type A B W F E WR20 5.50 ±0.20 2.80 ±0.20 WR25 6.90 ±0.20 3.60 ±0.20 Type P1 P0 Φ D T WR20 WR25 0 . 050 . 1+ Φ MAX1.2 Reel dimensions Symbol A B C D Taping quantity WR20, WR25 by plastic tape taping 4,000 pcs per reel.