WWXXW WALSIN | Alldatasheet
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Page 1 of 8 ASC_WWxxW_V01 FEB - 2016 WW25W, WW20W, WW10W, WW12W, WW08W, WW06W Thick Film Normal Low Ohm Chip Resistors RoHS Exemption free and Lead free Size 2512, 2010, 1210, 1206, 0805, 0603 *Contents in this sheet are subject to change without prior notice.
Page 2 of 8 ASC_WWxxW_V01 FEB - 2016 FEATURE 1. High power rating and low TCR 2. High reliability and stability 3. Reduced size of final equipment 4. RoHS exemption free and Lead free products APPLICATION
- Power supply
- PDA
- Digital meter
- Computer
- Automotives
- Battery charger
- DC-DC power converter
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 paste that is applied to the top surface of the substrate. The composition of the paste 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 ease of soldering the outer layer of these end terminations is Tin (lead free) alloy. Fig 1. Construction of Chip-R
Page 3 of 8 ASC_WWxxW_V01 FEB - 2016 QUICK REFERENCE DATA Item General Specification Series No. WW25W WW20W WW10W WW12W WW08W WW06W Size code 2512 (6432) 2010 (5025) 1210 ( 3225 ) 120 6 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) Resistance Tolerance ±5%, ±1% Resistance Range 0.010Ω ~ 0.910 Ω , E24 0.050Ω ~ 0.910 Ω , E24 TCR (ppm/ °C) 10 - 20m Ω : ±1000 22 - 39m Ω : ±600 40 - 47m Ω : ±200 50 - 91m Ω : ±100 100 - 910m Ω : ±100 10 - 20m Ω : ±1000 22 - 39m Ω : ±600 40 - 47m Ω : ±200 50 - 91m Ω : ±100 100 - 910m Ω : ±100 10 - 20m Ω : ±600 22 - 39m Ω : ±400 40 - 47m Ω : ±200 50 - 91m Ω : ±100 100 - 910m Ω : ±100 10 - 20m Ω : ±1000 22 - 39m Ω : ±600 40 - 47m Ω : ±200 50 - 91m Ω : ±100 100 - 910m Ω : ±100 10 - 20m Ω : ±1000 22 - 39m Ω : ±600 40 - 47m Ω : ±400 50 - 91m Ω : ±200 100 - 910m Ω : ±100 50 - 91m Ω : ±400 100 - 910m Ω : ±200 Max. dissipation at T amb =70 °C
1 W 3/4W 2/3 W 1/3 W 1/4 W 1/8 W
-55 ~ +155’C MECHANICAL DATA Symbol WW25W WW20W WW10W WW12W WW08W WW06W RECOMMENDED SOLDERING PAD Symbol WW25W WW20W WW10W WW12W WW08W WW06W
Page 4 of 8 ASC_WWxxW_V01 FEB - 2016 MARKING /circle6 4-digits marking for 2512, 2010, 1210, 1206, 0805 size Each resistor is marked with a four-digit code on the protective coating to designate the nominal resistance value. /circle6 3-digits marking for 0603 size /circle6 Each resistor is marked with a three -digit code on the protective coating to designate the nominal resistance value.
Page 5 of 8 ASC_WWxxW_V01 FEB - 2016 FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of ±5% & ±1%. The values of the E24 series are in accordance with “IEC publication 60063”. Derating curve 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 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
Page 6 of 8 ASC_WWxxW_V01 FEB - 2016 CATALOGUE NUMBERS The resistors have a catalogue number starting with: WW12 W R020 F T L Size code WW25 : 2512 WW20 : 2010 WW10 : 1210 WW12 : 1206 WW08 : 0805 WW06 : 0603 Type code W : Thick film Power low ohm low TCR Resistance code 0.020 Ω = R020 0.510 Ω = R510 0.025 Ω = R025 Tolerance J : ±5% F : ±1% Packaging code T : 7” Reel taping Q : 10” Reel taping G : 13” Reel taping Termination code L = Sn base (lead free) Tape packaging WW10, WW12,WW08, WW06 : 8mm width pa per taping 5,000pcs per 7” reel; 10,000pcs per 10” reel; 20,000pcs per 13” reel. WW25, WW20: 12mm width emboss taping 4,000pcs per 7” reel; 8,000pcs per 10” reel; 16,000pcs per 13” reel.
Page 7 of 8 ASC_WWxxW_V01 FEB - 2016 TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) TEST PROCEDURE REQUIREMENT 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) t 1 : 25° C R 1 : Resistance at reference temperature 25° C R 2 : Resistance at test temperature 155° 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 5 times rated power. J: ΔR/R max. ±(2%+0.5m Ω ) F: ΔR/R max. ±(1%+0.5m Ω ) Solderability Clause 4.17 Un-mounted chips completely immersed for 3±0.5 second in a SAC solder bath at 245℃±2℃ good tinning (>95% covered) no visible damage Resistance to soldering heat(R.S.H) Clause 4.18 Un-mounted chips completely immersed for 10 ±1 second in a SAC solder bath at 260 ℃±5ºC no visible damage J: ΔR/R max. ±(1%+0.5m Ω ) F: ΔR/R max. ±(0.5%+0.5mΩ ) 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 J: ΔR/R max. ±(1%+0.5m Ω ) F: ΔR/R max. ±(0.5%+0.5mΩ ) 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 J: ΔR/R max. ±(3%+0.5m Ω ) F: ΔR/R max. ±(1%+0.5m 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 J: ΔR/R max. ±(3%+0.5m Ω ) F: ΔR/R max. ±(1%+0.5m Ω ) Bending strength Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(F R4); bending : 3mm for 0603/0805, 2mm for 1206 and above sizes, once for 10 seconds no visible damage J: ΔR/R max. ±(1%+0.5m Ω ) F: ΔR/R max. ±(0.5%+0.5mΩ ) Adhesion Clause 4.32 Pressurizing force: 5N, Test time: 10 ±1sec. No remarkable damage or removal of the terminations Insulation Resistance Clause 4.6 Test voltage: 100+/-15V I.R≧1G Ω
Page 8 of 8 ASC_WWxxW_V01 FEB - 2016 PACKAGING Paper Tape specifications (unit :mm) Series No. A B W F E WW10W 3.60 ±0.20 3.00 ±0.20 WW12W 3.60 ±0.20 2.00 ±0.20 WW08W 2.40 ±0.20 1.65 ±0.20 WW06W 1.90 ±0.20 1.10 ±0.20 8.00 ±0.30 Series No. P1 P0 Φ D T WW25W Max. 1.2 WW20W Max. 1.2 WW10W Max. 1.0 WW12W Max. 1.0 WW08W Max. 1.0 WW06W 0 . 050 . 1+ Φ Max. 0.8 Reel dimensions Symbol A B C D 7” reel Φ 178.0 ±2.0 Φ 60.0 ±1.0 10” reel Φ 254.0 ±2.0 Φ 100.0 ±1.0 13: reel Φ 330.0 ±2.0 Φ 100.0 ±1.0 13.0 ±0.5 10.0 ±1.5 ( 8mm tape ) 13.8±1.5 (12mm tape)