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Page 1 of 10 ASC_WW06 08 12R_V09 FEB - 2017 WW12R, WW08R, WW06R 1%, 5% Metal Low Ohm Power Chip Resistors Size 1206 (1W), 0805 (0.5W), 0603 (0.33W) RoHS Exemption free and Lead free Sensing Type *Contents in this sheet are subject to change without prior notice.
Page 2 of 10 ASC_WW06 08 12R_V09 FEB - 2017 FEATURE 1. Metal 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 & Halogen free & Lead free 6. Inductance below 1nH APPLICATION Power supply PDA Digital meter Computer Automotives Battery charger DC-DC power converter
DESCRIPTION
The resistors are constructe d in a high grade low resistive metal 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 Chip-R
Page 3 of 10 ASC_WW06 08 12R_V09 FEB - 2017 QUICK REFERENCE DATA Item General Specification Series No. WW06R WW08R WW12R Size code 0603 ( 1608 ) 0805 ( 2012 ) 1206 (3216) Resistance Tolerance 5% , 1% Resistance Range 5, 10mΩ 2, 3, 4, 5, 6, 7, 8, 9 10mΩ, 1 ~ 15 mΩ TCR (ppm/C) ±70 ppm/C Max. power at Tamb=70C 1/3 W 1/2 W 1W Max. Operation Current (DC or RMS) Operation temperature -55 ~ +155’C Note : Max. Operation Current : So called RCWC (Rated Continuous Working Current) is determined by Value ResistancePower / RatedRCWC listed above. MECHANICAL DATA Unit: mm Type Size (inch) Resistance L (mm) W (mm) H (mm) c (mm) d (mm) WW06R 0603 5mΩ WW08R 0805 2mΩ 2.0±0.15 1.25±0.15
Page 4 of 10 ASC_WW06 08 12R_V09 FEB - 2017 MARKING WW12R/WW08R each resistor is marked with a 2-digit code with underline on the protective coating to designate the nominal resistance value. WW06R has no marking! Example: 05 = 0.005 10 = 0.010 FUNCTIONAL DESCRIPTION Derating curve The power that the resistor can dissipate depends on the operating temperature; see Fig.2
Page 5 of 10 ASC_WW06 08 12R_V09 FEB - 2017 SOLDERING CONDITIONS The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260C 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 245C during 3 seconds within lead-free solder bath. The test condition for no leaching is 260C for 30 seconds. Typical examples of soldering processes that provide reliable joints without any damage are given in Fig Fig 3. Infrared soldering profile for Chip Resistors WWxxR CATALOGUE NUMBERS The resistors have a catalogue number starting with . WW06 R R005 J T L Size code WW06 : 0603 WW08 : 0805 WW12 :1206 Type code R : 1/3W, 0603 1/2W, 0805 1W, 1206 Resistance code R is first digit followed by 3 significant digits. 0.010 = R010 0.005 = R005 Tolerance J : 5% F : 1% Packaging code T : 7” reel Q : 10” reel Termination code L = Sn base (lead free) Reeled tape packaging : 8mm width paper taping 5,000pcs per 7” reel. 10,000pcs per 10” reel.
Page 6 of 10 ASC_WW06 08 12R_V09 FEB - 2017 RESISTANCE MEASUREMENT SCHEMATIC DIAGRAM The resistance measured is based on mounted on PCB to match with customer field application. RECOMMENDED PCB LAND PATTERN WW06R WW08R WW12R
Page 7 of 10 ASC_WW06 08 12R_V09 FEB - 2017 TEST & REQUIREMENTS
Page 8 of 10 ASC_WW06 08 12R_V09 FEB - 2017
Page 9 of 10 ASC_WW06 08 12R_V09 FEB - 2017 (1%+0.0005ohm) (1%+0.0005ohm)
Page 10 of 10 ASC_WW06 08 12R_V09 FEB - 2017 (1%+0.0005ohm) (1%+0.0005ohm)
Page 11 of 10 ASC_WW06 08 12R_V09 FEB - 2017 PACKAGING Paper Tape specifications (unit :mm) Symbol A B W F E WW06R 1.90±0.20 1.15±0.15 WW12R 3.60±0.20 2.00±0.15 Symbol P1 P0 D T WW06R 1.0 0.050.1 0.8 max. WW08R 1.0 max. WW12R 1.0 max. Reel dimensions Symbol A B C D Taping quantity - Chip resistors 5,000 pcs per 7” reel; 10,000pcs per 10” reel.