■Derating Curve
Ambient temperature
Terminal part temperature
100
80
60
40
20
0
100
80
60
40
20
0
-60 -40 -20
-55
0
20 40 60 80 100120 140 160
125 155
-60 -40 -20
-55
0
20 40 60 80 100120 140 160
70
155
Terminal Part temperature（℃）
Ambient temperature（℃）
For resistors operated at an ambient temperature of 70℃ or higher, the power 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.
■Temperature Rise
RK73G 1E-1J
RK73G 2A-2B
Regarding the temperature rise, the
value of the temperature varies per
70
60
50
40
30
20
10
0
60
50
40
30
20
10
0
2B
conditions and board for use since the
1E
1E
1J
1J
temperature is measured under our
measuring conditions.
2B
2A
2A
Measurement condition
Room temperature: 25℃
PCB: FR-4t
= 1.6mm
Cu foil thickness: 35µm
①：Hot spot
②：Terminal
0
25
50
75
100
0
25
50
75
100
Power Rating（ %）
Power Rating（ %）
■One-Pulse Limiting Electric Power
RK73G 1H-2B
100
10
2B
2A
1
1J
The maximum applicable voltage is equal to the max. overload voltage.
1E
Please ask us about the resistance characteristic of continuous applied pulse.
The pulse endurance values are not assured values,so be sure to check the
products on actual equipment when you use them.
0.1
1H
0.001
0.01
0.1
1
10
100
1000
Pulse Duratio n（ ms）
■Performance
Performance RequirementsꢀΔR±（％＋0.1Ω）
Test Items
Test Methods
25℃
Limit
Typical
—
Resistance
Within specified tolerance
＋25℃/＋125℃：1H
＋25℃/－55℃ and ＋25℃/＋125℃：1E, 1J, 2A, 2B
T.C.R.
Within specified T.C.R.
—
Overload（Short time）
2
1
0.6
Rated voltage×2.5 for 5s（1E, 2B：Rated voltage×2 for 5s）
Resistance to
soldering heat
1：1H
0.4：1E, 1J, 2A, 2B
260℃±5℃, 10s±1s
0.5：Characteristic「Nil（」Standard） 0.3：Characteristic「Nil（」Standard）
Rapid change of
temperature
Characteristic「Nil」（Standard）ー 5 5 ℃（ 3 0 m in .）/ ＋ 1 2 5 ℃（ 3 0 m in .）100 cycles
Characteristic「A」（Heat shock resistance）：ー 5 5 ℃（ 3 0 m in .）/ ＋ 1 2 5 ℃（ 3 0 m in .）1000 cycles
1：Characteristic「A」
0.5：Characteristic「A」
（Heat shock resistance）
（Heat shock resistance）
3：1H, 1E
2：1J, 2A, 2B
1：1H, 1E
0.6：1J, 2A, 2B
40℃±2℃, 90%～95%RH, 1000h
1.5h ON/0.5h OFF cycle
Moisture resistance
Endurance at 70℃ or rated 3：1H, 1E
1：1H, 1E
0.6：1J, 2A, 2B
70℃±2℃ or rated terminal part temperature ±2℃ 1000h
1.5h ON/0.5h OFF cycle
terminal part temperature
2：1J, 2A, 2B
High temperature exposure
1
0.6
＋155℃, 1000h
■Precautions for Use
・The substrate of chip resistors is alumina. Cracks may occur at the connection of solder (solder fillet portion) due to the difference of the coefficient of thermal
expansion from a mounting board when heat stress like heat cycle, etc. are repeatedly given to them. Care should be taken to the occurrence of the cracks when
the change in ambient temperature or ON/OFF of load is repeated. The occurrence of the crack by heat stress may be influenced by the size of a pad, solder
volume, heat radiation of mounting board etc., so please pay careful attention to designing when a big change in ambient temperature and conditions for use like
ON/OFF of load can be assumed.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Aug. 2ꢀ02ꢀ3
Oct. 2023
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
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www.koaglobal.com
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