Walsin Technology Corporation WF12T, WF08T, WF06T, WF04T 0.5%, 0.25%, 0.1% TC50 High Precision Thin Film chip resistors Size 1206, 0805, 0603, 0402 Page 1 of 9 WFxxT Version 04 Apr.-2007 Walsin Technology Corporation FEATURE 1. SMD metal film resistor 2. High reliability and stability of 0.1% and below per customer request 3. High performance of TCR: 50 ppm/K and below per customer request 4. Low current noise 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. Consctruction of Chip-R WFxxU Page 2 of 9 WFxxT Version 04 Apr.-2007 Walsin Technology Corporation QUICK REFERENCE DATA Item General Specification Series No. WF12T WF08T WF06T WF04T Size code 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) 0402 ( 1005 ) 0.5%, 0.25%, 0.1% Resistance Tolerance Resistance Range 4.7 ~ 1M ( E24 +E96 ) 4.7 ~ 1M ( E24 +E96 ) TCR (ppm/C) 10 ~ 330K ( E24 +E96 ) 10 ~ 100K ( E24 +E96 ) +50 ~ -50 ppm/C Max. dissipation at Tamb=70C 1/8W 1/10W 1/16W 1/16W Max. Operation Voltage (DC or RMS) 150V 100V 50V 25V Climatic category (IEC 60068) 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 RCWV = Rated Power x Resistance Value or Max. RCWV listed above, whichever is lower. Dimensions: Type WF12U WF08U WF06U WF04U L 3.10 0.10 2.00 0.10 1.60 0.10 1.00 0.05 W 1.60 0.10 1.25 0.10 0.80 0.10 0.50 0.05 A 0.45 0.20 0.25 0.20 0.25 0.15 0.20 0.10 B 0.45 0.20 0.40 0.20 0.30 0.15 0.25 0.10 t 0.60 0.15 0.50 0.15 0.45 0.15 0.35 0.05 Protective coat t End termination B Resistive layer A Ceramic Substrate W T 1001 L Page 3 of 9 WFxxT Version 04 Apr.-2007 Walsin Technology Corporation Marking Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance value. WF04T has no marking! Example: E24 serious 1% E96 serious 1% 39R0 => 390 820R =>821 17R8 =>25X 178R => 25A FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of 0.5%, 0.25%, 0.1%. The values of the E24/E96 series are in accordance with "IEC publication 60063". Derating The power that the resistor can dissipate depends on the operating temperature; see Fig.2 Figure 2. Maximum dissipation in percentage of rated power As a function of the ambient temperature 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 260C for one minute. 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 260C for 60 seconds. Typical examples of soldering processes that provide reliable joints without any damage are given in Fig 3. Page 4 of 9 WFxxT Version 04 Apr.-2007 Walsin Technology Corporation Catalogue numbers The resistors have a catalogue number starting with . WF06 T xxx D T Size code Type code Resistance code Tolerance Packaging code WF12: 1206 T: TCR 50ppm E96 +E24: D : 0.5% T : Reeled WF08: 0805 R is first code followed by C: 0.25% WF06: 0603 3 significant digits. B : 0.1% E24: 39R0=>390 WF04: 0402 820R =>821 E96: 17R8 =>25X 178R =>25A 1. Reeled tape packaging: 8mm width paper taping. 5,000pcs/reel for WF12T, WF08T, WF06T; 10,000pcs/reel for WF04T. Page 5 of 9 WFxxT Version 04 Apr.-2007 Walsin Technology Corporation TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) TEST REQUIREMENT PROCEDURE Resistor DC resistance DC resistance values measured Clause 4.5 <10@0.1V, <100@0.3V, <1K@1.0V, Within the specified tolerance 0.5%, 0.25%, 0.1% <10K@3V, <100K@10V,<1M@25V, <10M@30V Temperature Natural resistance change per change in degree Test temperature -55C ~ +125C centigrade. Coefficient of TCR: 50 ppm/C Resistance(T.C.R R - R 2 1 ) x 106 (ppm/C) Clause 4.8 R1 (t2 - t1 ) R1 : Resistance at reference temperature R2 : Resistance at test temperature t1 : 20C+5C-1C Short time overload (S.T.O.L) Clause 4.13 Permanent resistance change after a 5second R/R max. (0.2%+0.05) application of a voltage 2.5 times RCWV or the maximum overload 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 no visible damage 101second in a solder bath at 2705C R/R max. (0.1%+0.05) Solderability Un-mounted chips completely immersed for good tinning (>95% covered) 20.5second in a solder bath at 2355 no visible damage Clause 4.17 Leach Test Clause 4.18 Temperature cycling Clause 4.19 Load life (endurance) Un-mounted chips completely immersed for 60 Ditto 1second in a solder bath at 2605 30 minutes at -55C3C, 2~3 minutes at no visible damage 20C+5C-1C, 30 minutes at +125C3C, R/R max. (0.1%+0.05) 2~3 minutes at 20C+5C-1C, total 5 continuous cycles 702C, 1000 hours, loaded with RCWV or R/R max. (0.5%+0.05) Vmax,1.5 hours on and 0.5 hours off Clause 4.25 Load life in Humidity Clause 4.24 1000 hours, at rated continuous working voltage R/R max. (0.5%+0.05) in humidity chamber controller at 40C2C and 90~95% relative humidity, 1.5hours on and 0.5 hours off Clause 4.33 Resistors mounted on a 90mm glass epoxy resin R/R max. (0.1%+0.05) PCB(FR4); bending : 3 mm, once for 10 seconds. Adhision Pressurizing force: 5N, Test time: 101sec. Bending strength Clause 4.32 Page 6 of 9 WFxxT No remarkable damage or removal of the terminations. Version 04 Apr.-2007 Walsin Technology Corporation PACKAGING Paper Tape specifications (unit :mm) P0 F D Series No. A B W D E WF12 3.600.20 2.000.20 8.000.30 3.500.20 1.750.10 WF08 2.400.20 1.650.20 8.000.30 3.500.20 1.750.10 WF06 1.900.20 1.100.20 8.000.30 3.500.20 1.750.10 WF04 1.200.10 0.70.10 8.000.20 3.500.05 1.750.10 Series No. F P0 D T WF12 4.000.10 4.000.10 1.50 +-00..10 Max. 1.0 WF08 4.000.10 4.000.10 1.50 +-00..10 Max. 1.0 WF06 4.000.10 4.000.10 1.50 +-00..10 0.650.05 WF04 2.000.10 4.000.10 1.50 +-00..10 0.400.05 Reel dimensions B C A D Page 7 of 9 Symbol A B C D (unit : mm) 178.02.0 60.01.0 13.00.2 9.00.5 WFxxT Version 04 Apr.-2007 Walsin Technology Corporation Taping quantity - Chip resistors 5,000 pcs per reel ( WF12T, WF08T, WF06T ) Chip resistors 10,000 pcs per reel ( WF04T ) Page 8 of 9 WFxxT Version 04 Apr.-2007