DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 8
Technical content
Page 1 of 8 WFxxK_V02 Feb-2013 WF12K, WF08K, WF06K, WF04K Thick film TC50 High Precision Thick Film chip resistors Size 1206, 0805, 0603, 0402
Page 2 of 8 WFxxK_V02 Feb-2013 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 elect rodes 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 WFxxK
Page 3 of 8 WFxxK_V02 Feb-2013 QUICK REFERENCE DATA Item General Specification Series No. WF12K WF08K WF06K WF04K Size code 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) 0402 ( 1005 ) Resistance Tolerance 1.0%, 0.5%, 0.25%, 0.1% Resistance Range 10 ~ 1M ( E24 +E96 ) 100 ~ 1M ( E24 +E96 ) TCR (ppm/C) 50 ppm/C Max. dissipation at Tamb=70C 1/4W 1/8W 1/10W 1/16W Max. Operation Voltage (DC or RMS) 200V 150V 50V 50V Max. Overload Voltage (DC or RMS) 400V 300V 100V 100V Operation temperature - 55 ~ +155’C 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. DIMENSIONS(unit : mm) Type WF12K WF08K WF06K WF04K Protective coat Resistive layer End termination Ceramic Substrate t B A T W L 1001
Page 4 of 8 WFxxK_V02 Feb-2013 MARKING 3-digits marking for 0603 size WFxxK has same marking rule as commodity ±1%. 3-digits marking（1% : 0603） Nominal resistance Description 1.E-24 series As 0603 WR06X 5%. 2.E-96 series The 1st two digit codes are referring to the CODE on the table, the 3rd code is the index of resistance value : EX : 17.8Ω=25X，178Ω=25A，1K78 =25B 17K8=25C， 178K=25D， 1M78=25E 3. Remark There is no marking for the items are not under E-24 and E-96 series CODE R_value CODE R_value CODE R_Value CODE R_value CODE R_value CODE R_value CODE R_value CODE R_value 01 100 13 133 25 178 37 237 49 316 61 422 73 562 85 750 02 102 14 137 26 182 38 243 50 324 62 432 74 576 86 768 03 105 15 140 27 187 39 249 51 332 63 442 75 590 87 787 04 107 16 143 28 191 40 255 52 340 64 453 76 604 88 806 05 110 17 147 29 196 41 261 53 348 65 464 77 619 89 825 06 113 18 150 30 200 42 267 54 357 66 475 78 634 90 845 07 115 19 154 31 205 43 274 55 365 67 487 79 649 91 866 08 118 20 158 32 210 44 280 56 374 68 499 80 665 92 887 09 121 21 162 33 215 45 287 57 383 69 511 81 681 93 909 10 124 22 165 34 221 46 294 58 392 70 523 82 698 94 931 11 127 23 169 35 226 47 301 59 402 71 536 83 715 95 953 12 130 24 174 36 232 48 309 60 412 72 549 84 732 96 976 4-digits marking for 1206, 0805 size Each resistor is marked with a four digits code on th e protective coating to designate the nominal resistance value of E24+E96. For values below 976 the R is used as a digit. For values of 1 00 or greater, the first 3 digits are significant, the fourth digit indicates the number of multiple to follow. Example RESISTANCE 10 12 100 6800 47000 4-digits marking 10R0 12R0 1000 6801 4702 No marking code for 0402 size
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 6 of 8 WFxxK_V02 Feb-2013 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 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 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 . WF08 K xxxx D T L Size code WF12: 1206 WF08: 0805 WF06: 0603 WF04: 0402 Type code TCR 50ppm Resistance code E24 +E192: R is first code followed by 3 significant digits. E24: 39R0=>39R0 820R =>8200 E96: 49R9 =>49R9 499R =>4990 Tolerance F : 1.0% D : 0.5% C: 0.25% B : 0.1% Packaging code T : 7” reel G : 13” reel Termination code L : lead free 1. Reeled tape packaging: 8mm width paper taping. for WF12, WF08, WF06, 5,000pcs/ 7” reel; 20kpcs/ 13” reel for WF04, 10,000pcs/ 7” reel ; 70kpcs/ 13” reel
Page 7 of 8 WFxxK_V02 Feb-2013 TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) TEST PROCEDURE REQUIREMENT Resistor DC resistance Clause 4.5 DC resistance values measured <10M@30V 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) 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 5second application of a voltage 2.5 times RCWV or the maximum ove rload voltage specified in the above list, whichever is less. 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 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 +1 25C3C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous cycles no visible damage Load life (endurance) Clause 4.25 70±2ºC, 1000 hours, loaded with RCWV or Vmax,1.5 hours on and 0.5 hours off Load life in Humidity Clause 4.24 1000 hours, at rated continuous working voltage in humidity chamber controller at 40 C2C and 90~95% relative humidity, 1.5hours on and 0.5 hours off Bending strength Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4); bending : 3 mm, once for 10 seconds. Adhision 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 8 of 8 WFxxK_V02 Feb-2013 PACKAGING Paper Tape specifications (unit :mm) F P0 D Series No. A B W D E Series No. F P0 D T WF12 4.00±0.10 4.00±0.10 1.0 0.050.1 Max. 1.0 WF08 4.00±0.10 4.00±0.10 1.0 0.050.1 Max. 1.0 WF06 4.00±0.10 4.00±0.10 1.0 0.050.1 0.65±0.05 WF04 2.00±0.10 4.00±0.10 1.0 0.050.1 0.40±0.05 Reel dimensions ABC D Symbol A B C D Taping quantity - Chip resistors 5,000 pcs per 7” reel; 20,000 pcs per 13: reel ( WF12, WF08, WF06 ) - Chip resistors 10,000 pcs per 7” reel; 70,000 pcs per 13” reel ( WF04 )