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A New Specification of ±0.5% Resistance Tolerance Added to WK73R 0508 Inch Size.

2025.07.23

Contribution to Higher Precision of Equipment by Realizing Narrow Tolerances

WK73R

KOA's WK73 series wide-terminal flat chip resistors feature large electrodes that offer excellent heat dissipation and superior resistance to thermal shock.
Compared to general-purpose chip resistors (RK73 series), this product which applies terminal part temperature regulation supports high rated power in all sizes from 0204 to 1225 inch by reviewing the specifications. (Rated power up to 4W guaranteed for 1225 inch size)
A new specification of ±0.5% resistance tolerance has been added to the WK73R 0508 inch size. It supports high rated power with high accuracy, and contributes to miniaturization of circuits, reduction of the number of parts, and high precision of equipment. AEC-Q200 tested.

Applications:
Car electronics, power supply, industrial equipment, etc.
Please contact us for details.

Type Size
(inch) 		 Power Rating
(W)*¹		 T.C.R.
(×10-6/K)		 Resistance
Range
(Ω)		 Tolerance
(%)		 Operating
Temp. Range
(℃)
 WK73 RK73 
WK73R 1E
  0204  0.33 0.1  ±100
  10 ~ 1M  F:±1
J:±5		 -55 ~ +155
WK73R 1J  0306  0.66 0.125  ±100
  10 ~ 9.76k
 0.5  10 ~ 1M
WK73S 2A  0508
  1.25  0.25 0～＋300
0～＋200
±100		  20m ~ 9.76
WK73R 2A  1  ±100  10 ~ 20k D:±0.5NEW
F:±1
J:±5
 0.75  20.5k ~ 1M
WK73S 2B
  0612  1.5  0.25  ±800 ~ ±100  10m ~ 9.76  D:±0.5
F:±1
J:±5
WK73R 2B  1.5  ±100  10 ~ 9.76k
 0.75  10 ~ 1M
WK73S 2H  1020  3.0  0.75  ±800 ~ ±100  10m ~ 9.76  F:±1
J:±5
WK73R 2H  2.0  ±100 ~ ±200  10 ~ 1M
WK73S 3A  1225  4.0  1.0  ±800 ~ ±100  10m ~ 9.76
WK73R 3A  3.0  ±100 ~ ±200  10 ~ 1M
*1 Please keep the condition that the terminal of the resistors is below the rated terminal part temperature. 

Anti-Sulfur Resistors WK73 series

Design Support Data

Features of Wide Terminal Type Resistor