For further information on packaging, please refer
to Appendix A
1002
Nominal
Resistance
RK73B:
3 digits
RK73H:
4 digits
RK73Z:
None
F
Resistance
Tolerance
D: ±0.5%
F: ±1%
G: ±2%
J: ±5%
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
1/24/22
50
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
flat chip resistors (anti-sulfuration)
applications and ratings
RK73B/RK73H
Part
Designation
Rated
Rated
T.C.R.
Power
Terminal
Ambient
(ppm/°C)
Rating
Part
Temp.
Max.
Temp.
±200
±250
––
0.03W
0 - +300
±200
0.05W
±300
±100
0.1W
±200
±100
0.1W
±200
±100
0.125W
±200
±100
125°C
70°C
0.25W
±200
±100
0.25W
±200
0.5W
±100
±200
±100
±200
±100
±200
±100
±200
Maximum Maximum Operating
RK73H
RK73B
Temp.
Working Overload
D±0.5%
G±2%
J±5%
F±1%
Voltage
Range
Voltage
E24, E96
E24
E24
E24, E96
2
100kΩ - 2MΩ
2
100kΩ - 1MΩ 100kΩ - 10MΩ
-55°C
to
––
10Ω - 91kΩ
2
10Ω - 91kΩ 10Ω - 91kΩ
20V
30V
+125°C
1Ω - 9.1Ω
1Ω - 9.1Ω
––
100 - 1M
100Ω - 100kΩ 100Ω - 1MΩ
25V
50V
––
––
10Ω - 91Ω
10Ω - 97.6Ω
—
—
100Ω - 1MΩ 10Ω - 1MΩ
1.02MΩ - 10MΩ 10Ω - 10MΩ 1Ω - 10MΩ
––
1.02kΩ - 1MΩ
1.02kΩ - 1MΩ
—
—
75V
100V
––
1.02MΩ - 10MΩ 1.1kΩ - 10MΩ 1.1kΩ - 10MΩ
—
—
100Ω - 1kΩ 10Ω - 1kΩ
10Ω - 1kΩ
1Ω - 1kΩ
––
––
—
100Ω - 1MΩ 10Ω - 1MΩ
—
150V
200V
—
1.02MΩ - 10MΩ 10Ω - 10MΩ 1Ω - 10MΩ
-55°C
100Ω - 1MΩ 10Ω - 1MΩ
—
—
to
—
1.02MΩ - 10MΩ 10Ω - 10MΩ 1Ω - 10MΩ
+155°C
100Ω - 1MΩ 10Ω - 1MΩ
—
—
—
—
10Ω - 1MΩ
1Ω - 1MΩ
10Ω - 1MΩ 10Ω - 1MΩ
—
—
1 - 9.76
200V
400V
—
1.02MΩ - 10MΩ 1Ω - 10MΩ 1Ω - 10MΩ
10Ω - 1MΩ 10Ω - 1MΩ
—
—
—
1.02MΩ - 10MΩ 10Ω - 10MΩ 1Ω - 10MΩ
10Ω - 1MΩ 10Ω - 1MΩ
—
—
—
1.02MΩ - 10MΩ 10Ω - 10MΩ 1Ω - 10MΩ
Resistance Range
1F
1H
1E
1J
2A
2B
2E
W2H
W3A
W3A2
0.75W
1W
2W
3
95°C
Rated voltage =
√Power
rating x resistance value or max. working voltage, whichever is lower
2
3
The nominal resistance value for RK73H1F (F:±1%) is E24
If you use at the rated power, please keep the condition that the terminal of the resistor is below the rated terminal part temperature. Please refer to
the derating curves based on the terminal temperature.
If any questions arise whether to use the “Rated Ambient Temperature” or the “Rated Terminal Part Temperature,” in your usage conditions, please
give priority to the “Rated Terminal Part Temperature.” Prior to use and for more details refer to “Introduction of the derating curves in the terminal
part temperature” in the beginning of the catalog.
While using under high power, the temperature of the product may increase depending on the condition of heat dissipation from PCB.
Be sure to check the terminal part temperature as well as precautions to use on delivery specification before use.
Derating Curve
RK73B-RK73H-RK73Z-RT
Ambient Temperature
% Rated Power for RK73B, RK73H
% Rated Current for RK73Z
RK73B-RK73H-RK73Z-RT
Terminal Part Temperature
% Rated Power for RK73B, RK73H
% Rated Current for RK73Z
100
80
% Rated Power
1H, 1E, 1J, 2A, 2B, 2E,
W2H, W3A (1W)
RK73B-RK73H-RT
Terminal Part Temperature W3A2
100
80
60
40
20
0
-60 -40
-55
100
80
1F
1H, 1E, 1J, 2A, 2B,
2E, W2H, W3A (1W),
W3A2 (2W)
60
40
20
0
-60 -40
-55
60
40
20
0
-60 -40
-55
-20
0
80
70
Ambient Temperature
(°C)
20
40
60
100 120
140
125
155
-20
0
100 120
140 160
125
155
Terminal Part Temperature
(°C)
40
60
80
20
-20
0
100 120 140 160
95
155
Terminal Part Temperature
(°C)
20
40
60
80
For resistors operated at an ambient temperature
of 70℃ or higher, the power (for RK73B, RK73H)
or a current rating (for RK73Z) shall be derated in
accordance with the above derating curve.
When the terminal part temperature of the resistor exceeds the rated terminal part temperature
shown above, the power shall be derated according to the derating curve.
Please refer to “Introduction of the derating curves based on the terminal part temperature” on
the beginning of our catalog before use.
6/29/20
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
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