POE International Corp SPECIFICATION OF HIGH PRECISION THIN FILM CHIP RESISTOR M01-00-E-07 Ver: 1 Page: 1 of 8 ROHS compliance WF12U, WF08U, WF06U, WF04U 0.5%, 0.1% TC25 High Precision Thin Film chip resistors Size 1206, 0805, 0603, 0402 POE International Corp SPECIFICATION OF HIGH PRECISION THIN FILM CHIP RESISTOR M01-00-E-07 Ver: 1 Page: 2 of 8 FEATURE 1. SMD metal film resistor 2. High reliability and stability of 0.1% and below per customer request 3. High performance of TCR: 25 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 POE International Corp M01-00-E-07 Ver: 1 SPECIFICATION OF HIGH PRECISION THIN FILM CHIP RESISTOR Page: 3 of 8 QUICK REFERENCE DATA Item General Specification Series No. WF12U WF08U WF06U WF04U Size code 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) 0402 ( 1005 ) 0.5%, 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 ) +25 ~ -25 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 0.60 0.15 0.50 0.15 0.45 0.15 0.35 0.05 B 0.45 0.20 0.40 0.20 0.30 0.20 0.25 0.10 t 0.50 0.20 0.40 0.20 0.30 0.20 0.20 0.10 Protective coat t End termination B Resistive layer A Ceramic Substrate W T 1001 L POE International Corp SPECIFICATION OF HIGH PRECISION THIN FILM CHIP RESISTOR M01-00-E-07 Ver: 1 Page: 4 of 8 Marking Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance value. WF04U has no marking! Example: E24 serious 1% 39R0 => 390 820R =>821 E96 serious 1% 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%, 0.1%. 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. POE International Corp M01-00-E-07 Ver: 1 SPECIFICATION OF HIGH PRECISION THIN FILM CHIP RESISTOR Page: 5 of 8 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 245C during 3 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. Catalogue numbers The resistors have a catalogue number starting with . WF06 Size code WF12 : 1206 WF08 : 0805 WF06 : 0603 WF04 : 0402 U xxxx B T _ Type code Resistance code Tolerance Packaging code Termination code U :TCR 25ppm E96 +E24: B : 0.1% T : 7" Reeled taping 4 significant digits. D : 0.5% B : Bulk _ = SnPb base ("_" means a blank) E24: 39R0=>39R0 820R =>8200 E96: 17R8 =>17R8 178R =>1780 1. Reeled tape packaging: 8mm width paper taping. 5,000pcs/reel for WF12U, WF08U, WF06U; 10,000pcs/reel for WF04U. L = Sn base (lead free) POE International Corp M01-00-E-07 Ver: 1 SPECIFICATION OF HIGH PRECISION THIN FILM CHIP RESISTOR Page: 6 of 8 TEST AND REQUIREMENTS REQUIREMENT TEST PROCEDURE Resistor DC resistance Temperature Coefficient of Resistance ( TCR ) DC resistance values measured at the test Within the specified tolerance 0.5% & 0.1% voltages specified below : Resistance <100 <1K <10K Test voltage 0.3V 1.0V 3.0V Resistance <100K <1M <10M Test voltage 10V 25V 50V Natural resistance change per change in degree Test temperature -55C ~ +125C centigrade. TCR: 25 ppm/C R2 - R1 x 106 R1 (t2 - t1 ) (ppm/C) R1 : Resistance at reference temperature R2 : Resistance at test temperature t1 : 25C Short time overload ( STOL ) Permanent resistance change after a 5second R/R max. (0.1%+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 Unmounted chips 101 seconds, 2605C Solderability Unmounted chips completely immersed for good tinning (>95% covered) 31sec. in a lead-free solder bath at 2455C no visible damage 1. 30 minutes at -55C3C, no visible damage 2. 2~3 minutes at room temperature, R/R max. (0.1%+0.05) 3. 30 minutes at +1553C, 4. 2~3 minutes at room temperature, Temperature cycling no visible damage R/R max. (0.1%+0.05) Total 5 continuous cycles Load life (endurance) 702C, 1000 hours, loaded with RCWV or R/R max. (0.5%+0.05) Vmax,1.5 hours on and 0.5 hours off Load life in Humidity 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 Bending and Termination strength Resistors mounted on a 90mm glass epoxy R/R max. (0.1%+0.05) resin PCB(FR4); bending : 3 mm, once for 10 seconds Pulling test : 500grams POE International Corp M01-00-E-07 Ver: 1 SPECIFICATION OF HIGH PRECISION THIN FILM CHIP RESISTOR Page: 7 of 8 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 Symbol A B C D (unit : mm) 178.02.0 60.01.0 13.00.2 9.00.5 POE International Corp SPECIFICATION OF HIGH PRECISION THIN FILM CHIP RESISTOR Taping quantity - Chip resistors 5,000 pcs per reel ( WF12U, WF08U, WF06U ) - Chip resistors 10,000 pcs per reel ( WF04U ) M01-00-E-07 Ver: 1 Page: 8 of 8