WWXXD WALSIN | Alldatasheet
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Page 1 of 10 WWxxD_V07 APR 2018 WW25D, WW12D, WW08D, WW06D 0.5%, 1%, 5% Metal Foil Low Ohm Power Chip Resistor Size 2512, 1206, 0805, 0603 Sensing Type Anti-Sulfur ASTM B-809 105C 1000hrs *Contents in this sheet are subject to change without prior notice.
Page 2 of 10 WWxxD_V07 APR 2018 FEATURE 1. Ultra low and stable TCR performance 2. High power rating and compact size 3. High reliability and stability 4. Reduced size of final equipment 5. RoHS exemption free & Lead free 6. ASTM B-809 105C 1000hrs compliant APPLICATION Power supply PDA Digital meter Computer Automotives Battery charger DC-DC power converter
DESCRIPTION
The resistors are constructed in a high grade low resistive metal foil which adhere on top of ceramic substrate body. The resistive layer is covered with a protective coat and printed a resistance marking code over it . Finally, the two external end terminations are added. For ease of soldering the outer layer of these end terminations is a Lead free terminations. Fig 1. Construction of 0603/0805/1206
Page 3 of 10 WWxxD_V07 APR 2018 QUICK REFERENCE DATA Item General Specification Series No. WW25D WW12D WW08D WW06D Size code 2512 (6432) 1206 (3216) 0805 (2012) 0603 (1608) Resistance Tolerance 5% , 1%, 0.5% (only for TC50) Resistance Range 2~450mΩ, 700 mΩ 3~700mΩ 3~500mΩ 5~75mΩ TCR (ppm/C) 2~9mΩ: ±100 10~700mΩ: ±50 3~9mΩ: ±100 10~700mΩ: ±50 3~9mΩ: ±100 10~500mΩ: ±50 5~9mΩ: 100 10~75mΩ: 50 Max. power at Tamb=70C 2W 1W 3/4W 1/2W Operation Temperature -55 ~ +155C Note : Max. Operation Current : So called RCWC (Rated Continuous Working Current) is determined by Value ResistancePower / RatedRCWC listed above. MECHANICAL DATA Type Size (inch) R-value L (mm) W (mm) H (mm) d (mm) WW25D 2512 WW12D 1206 WW08D 0805
Page 4 of 10 WWxxD_V07 APR 2018 WW06D 0603 RECOMMENDED SOLDER LAND PATTERN Type R-value P (mm) W (mm) D (mm) WW25D R002 0.60 3.57 4.35 R003 0.90 3.57 4.20 R004-R009 3.10 3.57 3.10 R010-R700 3.10 3.57 3.10 WW12D R003 0.60 1.84 2.10 R004-R008 1.20 1.84 1.80 R009-R700 1.20 1.84 1.80 WW08D R003 0.50 1.44 1.55 R004-R007 0.80 1.44 1.40 R008-R500 0.80 1.44 1.40 WW06D R005 0.50 0.92 1.35 R006-R009 0.60 0.92 1.30 R010-R075 0.60 0.92 1.30
Page 5 of 10 WWxxD_V07 APR 2018 MARKING Each resistor is marked with a four -digit code on 2512/1206 & three-digit code on 0805 & two -digit on 0603 protective coating to designate the nominal resistance value. Example: R020 = 0.02 ( WW25D/WW12D ) 020 = 0.02 ( WW08D ) 20 = 0.02 ( WW06D ) FUNCTIONAL DESCRIPTION Derating curve The power that the resistor can dissipate depends on the operating temperature; see Fig.2 STORAGE CONDITIONS Under airtight in temperature+10℃～40℃、relative humidity ≦75% can store 2 years. Without dew in temperature+10℃～60℃、relative humidity be 95% maximum value for 30days. SOLDERING CONDITIONS The robust construction of chip resistors allows them to be completely immersed in a solder bath o f 260C for max.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). Typical examples of soldering processes that provide reliable joints without any damage are given in Fig3 as below.
Page 6 of 10 WWxxD_V07 APR 2018 Fig 3. Infrared soldering profile for Chip Resistors CATALOGUE NUMBERS The resistors have a catalogue number starting with . WW12 D R020 F T L Size code WW25 : 2512 WW20 : 2010 WW12 : 1206 WW08 : 0805 WW06 : 0603 Type code D : Metal foil Resistance code R is first digit followed by 3 significant digits. 0.020 = R020 0.040 = R040 Tolerance J : 5% F : 1% D : 0.5% Packaging code T : 7” reeled in tape Termination code L = Sn base (lead free) 1206/ 0805/ 0603 Reeled tape packaging : 8mm width paper taping 5,000pcs per reel. 2512 Reeled tape packaging : 8mm width PC taping 4,000pcs per reel.
Page 7 of 10 WWxxD_V07 APR 2018 TEST & REQUIREMENTS
Page 8 of 10 WWxxD_V07 APR 2018 PACKAGING Tape Specifications (unit :mm) Symbol A B W F E Symbol P1 P0 D T WW25D 4.00±0.10 4.00±0.10 1.0 0.050.1 1.3 max. WW12D 4.00±0.10 4.00±0.10 1.0 0.050.1 1.0 max. WW08D 4.00±0.10 4.00±0.10 1.0 0.050.1 1.0 max. WW06D 4.00±0.10 4.00±0.10 1.0 0.050.1 1.0 max. Reel Dimensions Symbol A B C D Taping Quantity - 1206/0805/0603 chip resistors 5,000 pcs per reel. - 2512 chip resistors 4,000 pcs per reel.