For resistors operated at an ambient temperature of 70℃ or higher, the power shall be derated
in accordance with the above derating curve.
■ Surface Temperature Rise
250
Surface
temperature rise（℃）
Surface
temperature rise（℃）
250
■Load Life at 70℃ 1000h
5W
（L35A）
3W
5W
（L35A）
（L25A）
3W
（L25A）
2W
（L20A）
200
200
150
100
+4
+4
+2
0
-2
-4
0.1
SPR×1
SPR1
SPR1
2W
（L20A）
ΔR/R
（％）
150
100
50
50
0
0
0
0
ΔR/R
（％）
SPR×1
+2
0
-2
-4
1W
1W
（L15A）
（L15A）
0.5W
0.5W
（L10A）
（L10A）
0.25W
（L5A）
（L5A）
0.25W
25
25
50
50
75
Power rating ratio
（％）
75
100
Power rating ratio
（％）
100
1 2
0.1
10
100
1k
12
10
Resistance
（Ω）
10k
100
100k
1k
Resistance
（Ω）
10k
100k
■Performance
Test Items
Resistance
T.C.R.
Performance Requirements
ΔR±
（％＋0.05Ω）
Limit
Within specified tolerance
Within specified T.C.R.
±
（1％＋0.1Ω）
1
Typical
—
—
0.5
0.5
—
0.5
1.5：1/4W½2W
2.5：3W, 5W
1.5：1/4W½2W
2.5：3W, 5W
Test Methods
Measuring points are 10mm±1mm from the end cap.
＋25℃/＋125℃
Rated voltage×2.5 or Max. overload
vol., whichever is lower, for 5s
260℃±5℃, 10s±1s, 350℃±10℃, 3.5s±0.5s
Twist 360°5 times
,
－55℃
（30min.）
/＋155℃
（30min.）5 cycles
40℃±2℃, 90%½95%RH, 1000h
1.5h ON/0.5h OFF cycle
70℃±2℃, 1000h
1.5h ON/0.5h OFF cycle
（Short time）
Overloa
d
Resistance to soldering heat
Terminal strength
Rapid change of temperature
Moisture resistance
Endurance at 70℃
Resistance to solvent
No lead-coming off and loose terminals
1
±
（3％＋0.1Ω）
：1/4W½2W
±
（5％＋0.1Ω）
：3W, 5W
±
（3％＋0.1Ω）
：1/4W½2W
±
（5％＋0.1Ω）
：3W, 5W
No abnormality in appearance.
—
Marking shall be easily legible.
Ultrasonic washing with Isopropyl alcohol for 2 min.
Power : 0.3W/cm
2
, f : 28kHz, Temp : 35℃±5℃
Flame test : The test flame shall be applied and removed for each 15 sec
respectively to repeat the cycle 5 times.
Overload flame retardant : AC voltage corresponding to 2, 4, 8, 16 and 32
times the power rating shall be applied for each 1min. until disconnection
occurs.
However the applied voltage shall not exceed the value of 4 times of the
maximum operating voltage.
Flame retardant
No evidence of flaming or
self-flaming.
—
High Power Type Resistors
High Power Type Resistors
■Precautions for Use
・
Water and moisture may affect and change the high resistance range of this product largely. Consult us in advance when you consider using this product for such
applications that may cause serious damage.
・
Ionic impurities such as flux etc. attached to these products or mounted onto PCB, negatively affect the moisture resistance, corrosion resistance, etc. Ionic substances
like sweat and salt that may be caused according to the storage environment, mounting conditions and mounting environment, also affect the above characteristics. Wash
thoroughly these ionic substances. Confirm the reliability of washing and decide the dry conditions so that washing solvent is not to be remained inside the
product after washing. Do not apply electricity to the product nor use the product itself until the drying is fully completed.
・
Be careful to handle these resistors because outer coatings are comparatively weak to outer shock due to flameproof special coats. Please wash them to a
minimum. No external force is given to the coating films until they are well dried because the coating films become weaker right after washing. The original
strength will be returned after they are dried, so please pay attention not to apply any external force onto the coating film of resistors for 20 minutes after
drying. Especially no PC boards shall be piled up.
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.
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.
