WF20M WALSIN | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 7
Technical content
Page 1 of 7 WFxxM Trimmable_V11 Apr.2010 00-S-R06-D WF20M / WF12M / WF08M / WF06M 0/-20% and 0/-30% Trimmable chip resistors Size 2010, 1206, 0805, 0603
Page 2 of 7 WFxxM Trimmable_V11 Apr.2010 00-S-R06-D FEATURE 1. Reduced size of final equipment 2. Lower assembly costs 3. Higher component and equipment reliability 4. Improved performance at high frequency 5. Low noise, when not trimmed 6. RoHS compliant and Lead free products APPLICATION
- Consumer electrical equipment
- Automotive application
- EDP, Computer application
- Telecom application
DESCRIPTION
The resistors are constructed on a high-grade ceramic body (aluminum oxide). Internal metal electrodes are added at each and connected by a resistive paste, which is applied to the substrate. The composition of the paste is adjusted to give the approximate resistance required. The resistive layer is converted with a transparent protective coating. Finally the two external end terminations are added. For case of soldering the outer of theses end terminations is Tin (lead free) alloy. Fig 1. Consctruction of Trimmable Chip-R
Page 3 of 7 WFxxM Trimmable_V11 Apr.2010 00-S-R06-D QUICK REFERENCE DATA Item General Specification Series No. WF20M WF12M WF08M WF06M Size code 2010 (5020) 1206 (3216) 0805 (2012) 0603 (1608) Resistance Range 1 Ω ~ 10M Ω Tolerance 0/-10% and 0/-20% and 0/-30% (E24 series) TCR (ppm/ °C) ≥10 Ω <10 Ω ≤ ± 200 ppm/ °C -300~+500 ppm/ °C Max. dissipation at T amb =70 °C 1/2W 1/4 W 1/8W 1/10W Max. Operation Voltage (DC or RMS) 200V 200V 100V 50V Max. Over Load Voltage (DC or RMS) 400V 400V 200V 100 V 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. DIMENSIONS(unit : mm) WF20M WF12M L 5.00 ± 0.20 3.10 ± 0.10 W 2.50 ± 0.20 1.60 ± 0.10 T 0.55 ± 0.15 0.60 ± 0.15 Tb 0.65 ± 0.25 0.45 ± 0.20 Tt 0.60 ± 0.25 0.50 ± 0.20 WF08M WF06M L 2.00 ± 0.10 1.60 ± 0.10 W 1.25 ± 0.10 0.80 ± 0.10 T 0.50 ± 0.15 0.45 ± 0.15 Tb 0.40 ± 0.20 0.30 ± 0.20 Tt 0.40 ± 0.20 0.30 ± 0.10 MARKING No marking for Trimmable Chip Resistor
Page 4 of 7 WFxxM Trimmable_V11 Apr.2010 00-S-R06-D TRIMMING INTRODUCTIONS Typical value for a YAG-laser; cutting speed : 10-200 mm/sec, laser power : 1-6 Watt, bite size : 3~10 µm ( = speed / Q_rate , Bite Size is the distance each laser spot moving and influence the trimming accuracy) maximum trimming length : 60% of resistive film width, minimum distance from end termination to trimming cut : 0.20mm, minimum distance between cuts (double-cut) : 0.5mm Protection of the laser cut by epoxy-fenol lacquers, epoxy resins or silicon alkyd-resins. This is necessary for humidity test and stability under loaded. FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of ±5%, and E96 series for resistors with a tolerance of ±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.
Page 5 of 7 WFxxM Trimmable_V11 Apr.2010 00-S-R06-D 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 CATALOGUE NUMBERS The resistors have a catalogue number starting with : WF12 M 472_ M T L Size code WF20 : 2010 WF12 : 1206 WF08 : 0805 WF06 : 0603 Type code M : Trimmable Resistance code E24 : 2 significant digits followed by no. of zeros and a blank 4.7 Ω =4R7_ 10 Ω =100_ 220 Ω =221_ (“_” means a blank) Tolerance X : 0/-30% Y : 0/-20% Z : 0/-10% Packaging code T : 7” Reeled taping B : Bulk Termination code L = Sn base (lead free) 1. Reeled tape packaging : WF12M / WF08M / WF06M - 8mm width paper taping 5000pcs per reel. : WF20M – 12mm width paper taping 4000pcs per reel. 2. Bulk packaging : WF12M / WF08M / WF06M - 5000pcs per polybag : WF20M – 4000pcs per polybag
Page 6 of 7 WFxxM Trimmable_V11 Apr.2010 00-S-R06-D TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) TEST PROCEDURE REQUIREMENT DC resistance Clause 4.5 DC resistance values measured at the test voltages specified below : <100K Ω @10V, <1M Ω @25V, <10M Ω @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) ; t1 : 20° C+5° C-1° C R1 : Resistance at reference temperature R2 : 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. ±(2.0%+0.10 Ω ) 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 ΔR/R max. ±(1.0% +0.05 Ω ) 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 -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. ±(0.5% +0.05 Ω ) Load life (endurance) 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. ±(3.0% +0.1 Ω ) Load life in Humidity 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. ±(3.0% +0.1 Ω ) Bending strength Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4); bending : 3 mm, once for 10 seconds. (only 2010: 2mm) no visible damage ΔR/R max. ±(1% +0.05 Ω ) Adhesion 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 ≧10G Ω Dielectric Withstand Voltage Clause 4.7 Apply the maximum overload voltage (AC) for 1 minute No breakdown or flashover
Page 7 of 7 WFxxM Trimmable_V11 Apr.2010 00-S-R06-D PACKAGING Paper Tape specifications (unit :mm) Series No. A B W F E WF12M 3.60 ±0.20 2.00 ±0.20 WF08M 2.40 ±0.20 1.65 ±0.20 WF06M 1.90 ±0.20 1.10 ±0.20 Series No. P1 P0 Φ D T WF20M Max. 1.2 WF12M / WF08M Max. 1.0 WF06M 0 . 050 . 1+ Φ 0.65 ±0.05 Reel dimensions Symbol (unit : mm) A B C D