WFXXT WALSIN | Alldatasheet
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Page 1 of 10 ASC_WFxxT & U Mar - 2019 WF25T/U, WF20T/U, WF10T/U, WF12T/U, WF08T/U, WF06T/U, WF04T/U, WF02T/U. TC50 ,TC25 High Precision Thin Film Chip Resistors Size 2512, 2010, 1210, 1206, 0805, 0603, 0402, 0201 *Contents in this sheet are subject to change without prior notice.
Page 2 of 10 ASC_WFxxT & U Mar - 2019 FEATURE 1. SMD metal film resistor 2. High reliability and stability of 0.25% and below per customer request 3. High performance of TCR: 50 & 25 ppm/ °C and below per customer request 4. Low current noise 5. RoHS compliant and 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 WFxxT /U
Page 3 of 10 ASC_WFxxT & U Mar - 2019 QUICK REFERENCE DATA 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. DIMENSIONS:(unit: mm) Type WF25T&U WF20T&U WF10T&U WF12T&U WF08T&U WF06T&U WF04T&U WF02T&U Item General Specification Series No. WF25 T & U WF20 T & U WF10 T & U WF12 T & U WF08 T & U WF06 T & U WF04 T & U WF02 T & U Size Code 2512 (6432) 2010 (5025) 1210 (3225) 1206 (3216) 0805 (2012) 0603 (1608) 0402 (1005) 0201 (0603) Resistance Tolerance ±1.0%, ±0.5%, ±0.1% ±0.05% ±0.01% Resistance Range 1Ω ~ 3M Ω 4.7 Ω ~ 3M Ω 4.7 Ω ~ 2.49M Ω 1Ω ~ 2.49M Ω 4.7 Ω ~ 2M Ω 3.9Ω ~ 1M Ω 10 Ω ~ 255KΩ 100 Ω ~ 12K Ω TCR ± 50 & 25 ppm/ °C Max. Dissipation at T amb =70 °C 3/4W 1/2W 1/4W 1/8W 1/10W 1/16W 1/16W 1/32W Max. Operation Voltage 200V 200V 200V 200V 100V 50V 50V 15V Max. Overload Voltage 400V 400V 400V 400V 200V 100V 1 00V 30V Operating Temperature - 55~ +155’C Protective coat Resistive layer End termination Ceramic Substrate t B A T W L 1001
Page 4 of 10 ASC_WFxxT & U Mar - 2019 MARKING 3-digits marking for 0603 size WFxx T/ U has same marking rule as WRxx ±1%. 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 : Y=10 EX : 17.8 Ω=25X ，178 Ω=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 2512, 2010, 1210, 1206, 0805 size For E24+E96, each resistor is marked with a four digits code on the protective coating to designate the nominal resistance value. For values below 97 Ω 6 the R is used as a digit. For values of 100 Ω or greater, the first 3 digits are significant, the fourth digit indicates the number of multiple to follow. Example RESISTANCE 100 Ω 6800 Ω 47000 Ω 4-digits marking 1000 6801 4702 No marking code for 0402 and 0201 size FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E192 & E24 series for resistors with a tolerance of 60063”.
Page 5 of 10 ASC_WFxxT & U Mar - 2019 DERATING 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.
components on the reverse (mixed PCBs). provide reliable joints without any damage are given in Fig 3. and Table 1. Table 1. Infrared soldering condition for Chip Resistors
Page 7 of 10 ASC_WFxxT & U Mar - 2019 CATALOGUE NUMBERS The resistors have a catalogue number starting with . WF06 U xxxx B T L Size code WF25: 2512 WF20: 2010 WF10: 1210 WF12: 1206 WF08: 0805 WF06: 0603 WF04: 0402 WF02: 0201 Type code T: TCR= 50ppm U: TCR= 25ppm Resistance code R is first code followed by 3 significant digits. 100 Ω =1000 37.4K Ω =3742 Tolerance T : ±0.01% U: ±0.02% A : ±0.05% B : ±0.10% C : ±0.25% D : ±0.50% F : ±1.00% Packaging code T : 7” Taped &Reel A : 7” Reel 15k pcs Termination code L : lead free 1. Reeled tape packaging: 8mm width paper taping. 5,000pcs/reel for WF10, WF12, WF08, WF06; 10,000pcs/reel for WF04; 15,000pcs/real for WF02. 2. Reeled tape packaging: 12mm width paper taping 4,000pcs/reel for WF25,WF20.
Page 8 of 10 ASC_WFxxT & U Mar - 2019 TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) TEST PROCEDURE REQUIREMENT Resistor DC resistance Clause 4.5 DC resistance values measured 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 5second application of a voltage 2.5 times RCWV or the maximum overload voltage specified in the above list, whichever is less. ΔR/R max. ±(0.1%+0.05 Ω ) Resistance to soldering heat(R.S.H) IEC 60068-2-58:2004 Un-mounted chips completely immersed for 10 ±1second in a SAC solder bath at 260 ℃±5ºC no visible damage Δ R/R max. ±(0.1% +0.05 Ω ) Solder ability IEC 60068-2-58:2004 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 +155°C ±3°C, 2~3 minutes at 20° C+5° C-1° C, total 5 continuous cycles no visible damage ΔR/R max. ±(0.25%+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. ±(0.25%+0.05 Ω ) Humidity Clause 4.24 1000 hours, at rated continuous working voltage 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. ±(0.25%+0.05 Ω ) 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. ±(0.1% +0.05 Ω ) Adhesion Clause 4.32 Pressurizing force: 5N, Test time: 10 ±1sec. No remarkable damage or removal of the terminations.
Page 9 of 10 ASC_WFxxT & U Mar - 2019 PACKAGING Paper Tape specifications (unit :mm) Series No. Tape A B W D E Series No. P1 P0 Φ D T 0 . 050 . 1+ Φ Max 1.2 0 . 050 . 1+ Φ Max 1.2 0 . 050 . 1+ Φ Max. 1.0 0 . 050 . 1+ Φ Max. 1.0 0 . 050 . 1+ Φ Max. 1.0 0 . 050 . 1+ Φ 0.65 ±0.05 0 . 050 . 1+ Φ 0.40 ±0.05 0 . 050 . 1+ Φ 0.45 ±0.05
Page 10 of 10 ASC_WFxxT & U Mar - 2019 Reel dimensions ABC D WF25 , WF20 WF12 , WF10 , WF08 , WF06 , WF04 WF02 Symbol A B C D (unit : mm) 0 . 0 5 . 1180 + Φ 0 . 0 5 . 160 + Φ 13.0 ±0.2 0 . 1 0 . 09+ Φ Taping quantity - Chip resistors 4,000 pcs per reel ( WF25, WF20 ) - Chip resistors 5,000 pcs per reel ( WF10, WF12, WF08, WF06 ) - Chip resistors 10,000 pcs per reel ( WF04 ) - Chip resistors 15.000 pcs per reel ( WF02 ) Symbol A B C D Symbol A B C D