Cement Power Resistors
(RoHS Compliant)
FEATURES
• 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
DERATING CHART
70°
Percent Rated Load (%)
100
Heat Rise (°C)
80
60
40
20
0
-50 0 50 100 150 200 250 300
Ambient Temperature (°C)
155
275
PRM-RC Series
HEAT RISE CHART
140
120
100
80
60
40
20
0
0
5W, 7W, 10W
3W
2W
20
40
60
80
Rated Load (%)
100
ød
W
P
5
L
5
±
1
D
PART NUMBERING SYSTEM
2
8
Prefix
0
-
P
R
Series
M
5
Watts
-
1
0
Value
K
-
R
C
Suffix
(RoHS Compliant)
Dimensions (mm)
L ±1
25
38
50
SERIES, WATTAGE, VALUE RANGE, AND DIMENSIONS
Series
Watts (W)
5
7
10
Range of Values (Ω)
Wirewound
0.1 ~ 47
0.1 ~ 680
0.1 ~ 910
Power Film
48 ~ 100K
681 ~ 200K
911 ~ 200K
W ±1
12.5
12.5
12.5
D ±1
9
9
9
ød ±0.05
0.75
0.75
0.75
P ±1
5
5
5
*
PRM
PRM
PRM
Leads are centered
*
STANDARD STOCKED VALUES (Ω)
0.1
0.22
0.3
0.47
0.51
0.68
1.0
2.2
3.0
4.7
6.8
10
15
20
All standard E-24 values not listed are available special order.
33
47
56
68
75
100
150
200
300
330
470
680
1K
2K
4.7K
10K
CONSTRUCTION
No.
1
2
3
4
5
6
Subpart Name
Body
End Cap
Lead
Material
Rod Type Ceramics
Tin plated iron surface
Annealed copper wire
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
Metal Oxide Film
SiO2
4
5
6
3
Cement: Wire-wound
4
1
5
2
6
3
Cement: Power Film
1
2
(Electrosolder plated surface) Pb Free
Ceramic Case
Ceramic
Resistance wire
Ni-Cr Alloy
Resistance Film
Filling Materials
Metal Oxide Film
Quartz mixed sand
Specifications are subject to change without notice. No liability or warranty implied by this information. Environmental compliance based on producer documentation.
XICON PASSIVE COMPONENTS • (800) 628-0544
XC-600039
Date Revised: 12-05-07
Cement Power Resistors
(RoHS Compliant)
CHARACTERISTICS
Characteristics
Limits
PRM-RC Series
Test Methods
( JIS C 5201-1 )
Temperature
coefficient
± 350 PPM / °C Max.
<20Ω ± 400 PPM / °C
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
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
Power film: <100KΩ
>100KΩ
Resistance value
Wire-wound
Power film: <100KΩ
>100KΩ
Δ
R/R
± 5%
± 5%
± 10%
Δ
R/R
± 5%
± 5%
± 10%
Load life in
humidity
Load life
Terminal strength
No evidence of mechanical
damage
Resistance to
soldering heat
Resistance change rate is
± (1% + 0.05Ω) Max. with no
evidence of mechanical damage
Solderability
95 % coverage Min.
XICON PASSIVE COMPONENTS • (800) 628-0544
XC-600039
Date Revised: 9/28/05
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