■Derating Curve
Ambient temperature
Terminal part temperature
Terminal part temperature
100
100
100
80
60
40
20
0
80
80
60
40
20
0
2A/0.5W（100℃）
1J/0.2W
60
40
20
0
2B/0.5W（120℃）
1J/0.33W（125℃）
2A/0.25W
2B/0.33W
-60 -40 -20
-55
0
20 40 60 80 100 120 140 160
125 155
-60 -40 -20
-55
0
20 40 60 80 100 120 140 160
70 155
Ambient temperature（℃）
-60 -40 -20
0
20 40 60 80 100 120 140 160
125 155
Terminal part temperature（℃）
-55
Terminal part 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.
If you want to use at the rated power of ※1, please use the derating curves based on the terminal part temperature of right side.
※Please refer to“Introduction of the derating curves based on the terminal part temperature”on the beginning of our catalog
before use.
■Temperature Rise
SG73G 1J
SG73G 2A-2B
Regarding the temperature rise, the
value of the temperature varies per
conditions and board for use since the
temperature is measured under our
measuring conditions.
200
180
160
140
120
100
80
120
2B（0.5W）
①
1J（0.33W）
①
2A（0.5W）
①
1J（0.33W）
②
2B（0.5W）
②
100
80
60
40
20
0
2A（0.5W）
②
Measurement condition
Room temperature: 25℃
60
PCB: FR-4t
= 1.6mm
40
Cu foil thickness: 35µm
20
①：Hot spot
0
②：Terminal
0
25
50
75
100
0
25
50
75
100
Power Rating（ %）
Power Rating（ %）
■One-Pulse Limiting Electric Power
SG73G 1J-2B
1000
100
10
2B
2A
1
1J
The maximum applicable voltage is equal to the max. overload voltage.
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
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
T.C.R.
Within specified T.C.R.
—
＋25℃/－55℃ and ＋25℃/＋125℃
Overload（Short time）
Resistance to soldering heat
2
1
0.5
0.75
Rated voltage×2.5 for 5（s 2A : 0.5W, Rated voltage×2 for 5s）
260℃±5℃, 10s±1s
0.5：Characteristic「Nil」ꢀ
ꢀ （Standard）
1：Characteristic「A」
（Heat shock resistance）
0.3：Characteristic「Nil」ꢀ
ꢀ （Standard）
Characteristic「Nil」(Standard)：
Rapid change of
temperature
ꢀー55℃（30min.）/＋125℃（30min.）100 cycles
Characteristic 「A」(Heat shock resistance)：
0.5：Characteristic「A」
ꢀ
（Heat shock resistance） ꢀー55℃（30min.）/＋125℃（30min.）1000 cycles
40℃±2℃, 90%～95%RH, 1000h
1.5h ON/0.5h OFF cycle
Moisture resistance
2
0.75
Endurance at 70℃ or rated
terminal part temperature
High temperature exposure
70℃±2℃ or rated terminal part temperature ±2℃ 1000h
1.5h ON/0.5h OFF cycle
＋155℃, 1000h
2
1
0.75
0.3
■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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