News

Power Ratings of Wide Terminal Type Flat Chip Resistors Significantly Increased

2025.03.18

Terminal temperature specifications enable even higher power

WK73R/WK73S

KOA's WK73R/WK73S which are wide terminal type flat chip resistors have a structure with large electrodes for excellent heat dissipation and can apply higher power compared to short-side electrode resistors of the same size.
It is now possible to guarantee even higher power ratings by applying terminal temperature regulations and reviewing the specifications to WK73R/WK73S.
As a result, the series has accomplished higher rated power in all sizes from 0204 inch to 1225 inch, including a guaranteed maximum rated power of 4 W in the 1225 inch size(WK73S).

The category power enables high power application even at high temperatures and power can be applied up to
0.833 W at 155°C in the 0508 inch size(WK73S).Compared to general-purpose chip resistors (RK73 series),
it contributes to downsizing of circuits and reduction in the number of components. AEC-Q200 Tested.

(Applications)
Car electronics, power supply, industrial equipment, etc.
Contact KOA sales for details.

Type Size
(inch)
Power
Rating
(W)*¹
Terminal
Part Temp.
(°C)
T.C.R.
(×10-6/K)
Resistance
Range
(Ω)
WK73R 1E
 0204  0.33  125  ±100
 10 ~ 1M
WK73R 1J  0306  0.66  ±100
 10 ~ 9.76k
 0.5  10 ~ 1M
WK73S 2A  0508
 1.25  0 ~ +300  20m ~ 9.76
WK73R 2A  1  ±100  10 ~ 20k
 0.75  20.5k ~ 1M
WK73S 2B
 0612  1.5  ±800 ~ ±100  10m ~ 9.76
WK73R 2B  1.5  ±100  10 ~ 9.76k
 0.75  10 ~ 1M
WK73S 2H  1020  3  ±800 ~ ±100  10m ~ 9.76
WK73R 2H  2  ±100 ~ ±200  10 ~ 1M
WK73S 3A  1225  4  ±800 ~ ±100  10m ~ 9.76
WK73R 3A  3  ±100 ~ ±200  10 ~ 1M
*1 Please keep the condition that the terminal of the resistors is below the rated terminal part temperature.
About Anti-Sulfur Series

Setting of category power and
expanded rated power based on terminal part temperature specification

《Case of 0508 inch size low ohm WK73S2A》

ーPrevious spec

ー New spec : Revised rated power

 

 


Category Power : Maximum power that can be applied at maximum operating temperature