WF25P, WF20P, WF12P
1%, 5% 1 ~ 1M
Thick Film High Power Chip Resistors
Size 2512 2W, 2010 1W, 1206 1/2W
*Contents in this sheet are subject to change without prior notice.
Page 1 of 7 ASC_WF25-20-12P_V10 Jul.2011 Approval sheet
1. High power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. RoHS compliant and Lead free products
5. Flame Retardant
DC-DC power converter
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 a Tin (lead free) alloy.
Fig 1. Construction of Chip-R
Page 2 of 7 ASC_WF25-20-12P_V10 Jul.2011