WW12L WALSIN | Alldatasheet
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Technical content
Page 1 of 10 WW12-20-25L_V01 MAR - 2017 WW12L, WW20L, WW25L 1%, 5% Thick Film Power Low Ohm Chip Resistor Wide Termination RoHS compliant and Halogen free Size 0612, 1020, 1225 *Contents in this sheet are subject to change without prior notice.
Page 2 of 10 WW12-20-25L_V01 MAR - 2017 FEATURE 1. High power rating and compact size 2. High reliability and stability 3. Reduced size of final equipment 4. RoHS compliant and Halogen free products APPLICATION Power supply PDA Digital meter Computer Automotives Battery charger DC-DC power converter
DESCRIPTION
The resistor s 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 ap proximate 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 add ed at longer sides. For ease of soldering the outer layer of these end terminations is Tin (lead free) alloy. Fig 2. Construction of Chip-R
Page 3 of 10 WW12-20-25L_V01 MAR - 2017 QUICK REFERENCE DATA Item General Specification Series No. WW12L WW20L WW25L Size code 0612(1632) 1020 ( 2550 ), 1225(3264) Resistance Tolerance 5%; 1% Resistance Range 0.1 ~ 0.91, TCR (ppm/C) : 0.5 ~ 0.91: 0~200 ppm/C Max. dissipation at Tamb=70C 1W 1 W 2W Operation temperature -55 ~ +155C MECHANICAL DATA (unit : mm) TYPE WW12L WW20L WW25L
Figure 3. Maximum dissipation in percentage of rated power as a function of the ambient temperature. 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 10 WW12-20-25L_V01 MAR - 2017 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 Mou nt Resistors on one side of a PCB and other discrete components on the reverse (mixed PCBs). Surface Mount Resistors are tested for solderability at 235C during 2 seconds. The test condition for no leaching is 260 C for 30 seconds. Typical examples of sol dering processes that provide reliable joints without any damage are given in Fig 4. Fig 4. Infrared soldering profile for Chip Resistors CATALOGUE NUMBERS The resistors have a catalogue number starting with . WW12 L R100 F T L Size code WW25 : 1225 WW20 : 1020 WW12: 0612 Type code L : wide termination Resistance code 3 significant digits followed by no. of zeros 0.1 = R100 0.91 = R910 Tolerance J : 5% F : 1% Packaging code T : 7” Reel taping Termination code L = Sn base (lead free)
Page 6 of 10 WW12-20-25L_V01 MAR - 2017 TEST AND REQUIREMENTS (JIS C 5201-1: 2011)
Page 7 of 10 WW12-20-25L_V01 MAR - 2017 0612: 3mm 1020/1225: 1mm
Page 8 of 10 WW12-20-25L_V01 MAR - 2017
Page 9 of 10 WW12-20-25L_V01 MAR - 2017 PACKAGING Tape specifications (unit :mm) Type A B W F E Type P1 P0 D T WW12L 1.0 0.050.1 Max 1.0 WW20L 1.10±0.15 WW25L Reel dimensions
Page 10 of 10 WW12-20-25L_V01 MAR - 2017 (unit : mm) Symbol A B C D Taping quantity WW20L, WW25L by plastic tape taping 4,000 pcs per reel! WW12L by paper tape taping 5,000 pcs per reel!