1
SMW series
POWER WIRE WOUND CHIP RESISTORS
ELECTRICAL AND MECHANICAL PERFORMANCE
ENVIRONMENTAL CHARACTERISTICS
1. Flameproof UL94V0 molded package, resistant to heat,
humidity & insulation.
2. Special design for automatic surface mounting.
3. Excellent mechanical strength & electrical stability.
4. Reducing assembly costs.
Features
1.
2.
3.
4.
Characteristics
Characteristics
Resistance Tolerance
Resistance Temp. Coeff.
Power Rating Load
Short Time Overload
Dielectric Withstanding Voltage
Insulation Resistance
Solder-ability
Resistance to Soldering Heat
Temp. Cycle
Load Life
Moisture-proof Load Life
Standards
Standards
5% ( J ) or 1% ( F )
R/R 1%
200 ppm /
R/R 2%
Surface temp. 275 Max.
275 , R/R 1%
R/R 2%
1%
Minimum 95% coverage
95%
No evidence of mechanical damage.
, R/R 1%
No evidence of mechanical damage
or insulation breakdown.
AC 500V for 1 minutes
AC 500V 1
Rated voltage for 30 minutes
/ 30
5 times of rated wattage
for 5 seconds.
Test Methods
Test Methods
-
-55 ( 30 min.) Room Temp.( 3 min.)
+200 ( 30 min.)
Room Temp.( 3 min.) / ( 5 cycles)
-55 ~ 200
Rated power load 90 minutes ON
30 minutes OFF
70 1000 hours
Rated power load 90 minutes ON
30 minutes OFF
40 95% RH 500 hours
235 5 for 2 seconds
DC 500V megger
270 5 for 10 1 seconds
5 / 5
10,000MÙ
Reference Standards
IEC 60115-1
JIS C 5201-1
2
SMW series
B
C
A
F
E
D
-55
20
0 50 -50 100 150 200 250 275
0
20
40
60
80
100
Ambient Temp.
O
(C)
Rated Load
(%)
Rated Load
(%)
Surface Temperature Rise
O
(C)
20 40 60 80 100
0
0
100
200
300
2W
3W
5W
Rated
Wattage
A0.3 B0.3
C0.3
D0.3
Resistance
Range(Ù)
E Max.
F0.3
Dimensions
Derating Curve
Surface Temperature Rise
How to order
For resistors operated in ambient temperatures above 20 ,
power rating must be derated in accordance with the curve
below.
SMW 2W 10R J
a. b. c. d.
Unit mm
2W
3W
5W
It is composed by Type, Rated Wattage, Nominal Resistance and Tolerance.
a. Type( ): Power Wire Wound Chip Resistors are called "SMW".
b. Rated Wattage( ) : Shown by "W", such as 2W, 3W, 5W
c. Nominal Resistance( ) : 10Ù.
d. Tolerance( ): F 1% , J 5% .
4.0
5.5
7.3
6.7
10.5
13.5
1.4
1.7
1.7
3.55
5.0
6.8
0.1~200
0.1~300
0.1~680
1.5
2.3
2.5
7.9
12
17
Too low or too high ohmic values can be supplied only case by case.Note: