Cement Power Resistors
FEATURES
• Temperature Range: -55°C ~ +155°C
• 5% tolerance
• Exceptionally small, sturdy, and reliable
• Sealed with a special cement
• Excellent moisture resistance
• High temperature stability
• Ceramic flame retardant package
• Recommended wash method is alcohol
HEAT RISE CHART
250
Heat Rise (°C)
200
150
100
Percent Rated Load (%)
25W
10W
15-
PW Series
DERATING CURVE
100
80
60
40
20
0
-50
0 50 100 150 200 250 300
Ambient Temperature (°C)
70°
155
275
5W
0
20 40 60 80 100
Rated Load (%)
PART NUMBERING SYSTEM
C
R
5
Watts
-
1
0
Value
K
Series
POWER RATING, RANGE OF VALUES, AND DIMENSIONS
d
H
I
Watts
(W)
5
10
15
25
L
I
W
Dimensions (mm)
H ±1
9
9
11.5
13.5
Range of Values
Wire Wound
Metal Oxide
0.1 ~ 47
0.1 ~ 910
1 ~ 1K
2 ~ 1.0K
48 ~ 25K
911 ~ 25K
- - N/A - -
- - N/A - -
L ±1
22
49
49
64
W ±1
10
10
12.5
14.5
I ±5
35
35
35
35
d ±0.05
0.75
0.75
0.75
0.75
STANDARD STOCKED VALUES (Ω)
0.1
0.15
0.2
0.22
0.27
0.3
0.33
0.39
0.43
0.47
0.5
0.51
0.56
0.62
0.68
0.75
0.82
0.91
1.0
1.1
1.2
1.3
1.5
1.6
1.8
2.0
2.2
2.4
2.7
3.0
3.3
3.6
3.9
4.0
4.3
4.7
5.0
5.1
5.6
6.2
6.8
7.5
8.2
9.1
10
11
12
13
15
16
18
20
22
24
25
27
30
33
36
39
43
47
50
51
56
62
68
75
82
91
100
110
120
130
150
160
180
200
220
240
250
270
300
330
360
390
430
470
500
510
560
620
680
750
820
910
1.0K
1.1K
1.2K
1.3K
1.5K
1.6K
1.8K
2.0K
2.2K
2.4K
2.7K
3.0K
3.3K
3.9K
4.7K
5.0K
10K
20K
25K
*Other values available by special request
XICON PASSIVE COMPONENTS • (800) 628-0544
XC-600040
Specifications are subject to change without notice. No liability or warranty implied by this information. Environmental compliance based on producer documentation.
Date Revised: 9/28/05
Cement Power Resistors
CONSTRUCTION
No.
1
2
3
4
5
6
Subpart Name
Body
End Cap
Lead
Ceramic Case
Resistance wire
Filling Materials
Material
Rod Type Ceramics
Tin plated iron surface
Annealed copper wire
(Electrosolder plated surface) Pb Free
Ceramic
Ni-Cr Alloy
Quartz mixed sand
Material Generic Name
Al
2
O
3
, SiO
2
Tin : 5%, Iron : 95%
Tin-Coated Copper wire
Al
2
O
3
, SiO
2
Ni-Cr Alloy
SiO
2
4
6
3
PW Series
5
2
1
Cement: Wire wound
CHARACTERISTICS
Characteristics
Limits
Test Methods
( JIS C 5201-1 )
5.2 Natural resistance change per temp.
degree centigrade.
R
2
-R
1
x10
6
(PPM / °C)
R
1
(t
2
-t
1
)
R
1
: Resistance value at room temperature (t
1
)
R
2
: Resistance value at room temp. plus 100 °C (t
2
)
5.7 Resistors shall be clamped in the trough
of a 90° metallic V-block and shall be tested at
AC potential respectively for 60 +10/ -0 secs.
7.4 Resistance change after continuous
5 cycles for duty shown below:
Step
Temperature
1
-55 °C ± 3 °C
2
Room temp.
3
+155 °C ± 2 °C
4
Room temp.
5.5 Permanent resistance change after the
application of a potential of 2.5 times RCWV
for 5 seconds
7.9 Resistance change after 1,000 hours
operating at RCWV with duty cycle of
(1.5 hours "on", 0.5 hour "off") in a humidity test
chamber controlled at 40 °C ± 2 °C and 90 to 95 %
relative humidity
7.10 Permanent resistance change after
1,000 hours operating at RCWV with duty cycle
of (1.5 hours “on”, 0.5 hour “off”)
at 70 °C ±2 °C
6.1
Direct load :
Resistance to a 2.5 kgs direct load for 10 secs.
in the direction of the longitudinal axis of the
terminal leads
Twist test :
Terminal leads shall be bent through 90 ° at
a point of about 6mm from the body of the
resistor and shall be rotated through 360°
about the original axis of the bent terminal in
alternating direction for a total of 3 rotations
6.4 Permanent resistance change when leads
immersed to 3.2 to 4.8 mm from the body in
350 °C ± 10 °C solder for 3 ± 0.5 secs.
6.5 The area covered with a new , smooth
clean , shiny and continuous surface free
from concentrated pinholes.
Test temp. of solder : 245 °C ± 3 °C
Dwell time in solder : 2 ~ 3 seconds
Temperature
coefficient
± 350 PPM / °C Max.
<20Ω ± 400 PPM / °C
Dielectric
withstanding
voltage
No evidence of flashover,
mechanical damage, arcing
or insulation break down
Temperature
cycling
Resistance change rate is
± (2% + 0.05Ω) Max. with no
evidence of mechanical damage
Time
30 mins
10 ~ 15 mins
30 mins
10 ~ 15 mins
Short time
overload
Resistance change rate is
± (5% + 0.05Ω) Max. with no
evidence of mechanical damage
Resistance value
Wire-wound
∆
R/R
± 5%
Load life in
humidity
Load life
Resistance value
Wire-wound
∆
R/R
± 5%
Terminal strength
No evidence of mechanical
damage
Resistance to
soldering heat
Resistance change rate is
± (1% + 0.05ø) Max. with no
evidence of mechanical damage
Solderability
95 % coverage Min.
XICON PASSIVE COMPONENTS • (800) 628-0544
XC-600040
Specifications are subject to change without notice. No liability or warranty implied by this information. Environmental compliance based on producer documentation.
Date Revised: 9/28/05
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