RC
RC
RF
General
Carbon Composition (0.25 and 0.5 Watt)
Ceramic Composition (0.5 Watt and above)
Metal Film
RW
RP
Wirewound Power and Low Value
Power Film
RC
Film
Series: carbon composition (
1
/
4
&
1
/
2
watt)
High Voltage Thick
RC Series: ceramic composition (above
1
/
2
watt)
RF Series: metal film
RW Series: wirewound
RP Series: power film
RM Series: high voltage thick film
RM
Surface Mount
Power
Standard
pedestal mount
Recessed-base
mount
Flexible
J-bend
F e at u r e S
• Tolerance 1%, 5%, 10%, depending on construction
• Twelve wattage ratings
• Seven package sizes
• Two mounting designs to accommodate your soldering process
• Five power resistor technologies to optimize your operating perfor-
mance:
1. Carbon and Ceramic composition for surge and low inductance
2. Metal film for high ohmic value and low T.C.
3. Wire element for inrush current combined with low ohmic values.
Resistance values as low as 0.005Ω
4. Power film for high ohmic value and high wattage
5. High Voltage thick film for high voltage applications
• Flexible J-bend terminations
• Working Temperature Range: -55°C to +150°C
S e r I e S S P e C I F I C at I O N S
Part Number
RC0S2CA–––––
RC0R5DB–––––
RF0S8BA–––––
Power Maximum
(watts)* voltage
0.25
0.6
0.50
0.8
1.0
1.0
250
50
350
200
350
50
1% tol.
—
—
Resistance range
5% tol.
10% tol.
—
—
2.2Ω–5.6M
2.2Ω–20M
Temp. Coefficient
0.1Ω–1Ω
1Ω–10Ω
—
—
±400
±50
±400
±100
±200
±250
±250
±50
±250
±50
±250
±250
±50
—
±50
±50
10Ω+
±400
±20
±400
±100
±100
±20
Dielectric
Withstanding
1000V
1000V
Tape Size
13” reels
16mm
24mm
Quantity
per reel
1500
1000
RW0S6BB–––––
RW1S0BA–––––
RF1S0CA–––––
RC1R0EA–––––
RP1S3CA–––––
RW1S5CA–––––
0.010Ω–1K
0.005Ω–1K
10Ω–1M
—
1Ω–5M
0.005Ω–1K
0.005Ω–1K
1Ω–10M
1Ω–1M
—
±90
±90
—
—
1000V
1000V
12mm
12mm
12mm
2500
2000
2000
750
1000V
1.25
1.5
1.5
1.0
500
75
350
350
100
500
100
500
3.3-100K (10% tol only)
0.005Ω–1.5K
1Ω–1M
RP1S5CB–––––
RP1R5CB–––––
0.005Ω–1.5K
—
±90
—
—
-1300
±250
±250
1000V
1000V
16mm
±250
±250
±20
±250
±20
±250
±250
±20
±50
±20
1000V
1000V
1000V
1000V
1000V
1000V
1000V
32mm
1500
1500
1000
1000
1000
1000
1000
750
16mm
16mm
16mm
16mm
24mm
24mm
24mm
1500
RW2S0CB–––––
RW2R0CB–––––
RP2S0DA–––––
RP2R0DA–––––
2.0
2.0
2.0
2.5
0.005Ω–5K
—
0.005Ω–5K
—
0.005Ω–5K
1Ω–1M
0.005Ω–5K
1Ω–1M
±90
—
±90
—
RW2S0DA–––––
RW2R0DA–––––
RP2R5DB–––––
RP3R0EA–––––
RW3R0DB–––––
RW3R5EA–––––
RM0R7EA–––––
3.0
3.0
200
*25°C ambient. E24 values standard; contact Ohmite for custom values.
0.75
3.5
750
0.005Ω–13K
0.005Ω–25K
—
0.005Ω–13K
0.005Ω–25K
1KΩ–1000M
1Ω–1M
±90
±90
—
—
1000V
2500
350
1000V
24mm
1KΩ–1000M
1000V
32mm
1000
750
1000V
32mm
32mm
750
(continued)
32
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Surface Mount Power
P e r F O r M a N C e d ata
Temp. cycle
Load Life
(-55°C to 125°C, (1000 hours
Construction
1000 cycles)
at 25°C)
Carbon/Ceramic Comp.
±4.0%+.05Ω ±10.0%+.05Ω
Metal Film
±0.5%+.05Ω ±0.5%+.05Ω
Wirewound
±0.5%+.05Ω ±3.0%+.05Ω
Power Film
±3.0%+.05Ω ±5.0%+.05Ω
Wirewound, Non-inductive ±0.5%+.05Ω ±3.0%+.05Ω
Immersion
(260°C for
10 sec.)
±3.0%+.05Ω
±0.1%+.05Ω
±0.1%+.05Ω
±0.5%+.05Ω
±0.1%+.05Ω
Momentary
Overload
6.3x rated power for 5 sec.
2x rated power for 0.1 sec.
5x rated power for 5 sec.
2x rated power for 0.1 sec.
5x rated power for 5 sec.
No visible leaching
No mechanical damage
UL Material rating, UL94V0
Derating
100
Percent Rated Power
80
60
40
20
0
0
25
50
75 100 125
Ambient Temperature,
ϒ
C
150
RC
RF
RW
RP
RN
ALL models:
Leaching
(260°C Solder immersion, 60 sec.).......................
Thermal Shock
(Units at -55°C, then rated power applied)..
Flammability
.........................................................................
TCR
500
Recommended Solder Profile
300
Temperature °C
Soldering
10 sec.
60 sec.
400
300
200
100
Typical TCR for
less than 0.1 SMD
resistors (PPM/°C)
250
200
150
100
50
0
0
50
Preheating
120 sec.
Preheating:
145°C ±15°, max. 120 sec.
Soldering:
min. 220°C, max. 60 sec.
Cooling
Max. Temp.:
260°C ±5°, 10 sec.
100 150 200
Time (sec.)
250
0.02 0.04 0.06 0.08 0.10
Ohms
200
180
160
Temperature rise,
ϒ
C
140
120
100
80
60
40
20
100%
200%
Percent Rated power
300%
Solder joint
FR4
Package limit hot spot temperature rise
Alumina
The temperature rise graph
data was obtained by a
selection of test substrate
size and trace width for
each resistor size to limit
operating temperatures to
safe values.
The operating temperature
safe rises are either 100°C
substrate temperature rise
or 180°C package hot spot
temperature rise at 25°C
ambient.
FR4: 0.062 in. thick; 0.062
in. traces
Alumina: 0.040 in. thick;
0.010 in. traces
Molding material rated at
205°C continuous.
rC SerIeS: bake PrOCedure
RC SERIES ONLY
A. Heat Treatment
110°C ±10°C
15 hours
B. Frequency of
heat treatment
1 time only
C. Cautions
Solderability:
may be affected due to oxidization of lead wire
Resistance value:
some units may not completely recover to origi-
nal value.
Soldering heat:
some treated product may have substantial resis-
tance change during soldering operation. It is recommended that
parts be tested to evaluate soldering heat effects.
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33
Surface Mount Power
dIMeNSIONS
(in./mm)
A
B
M
L
N
P
E
J
Note 2
K
=0.006 Ref.
O
G
Note 1
H
D
F
=0.005
±.001
I
C
Recommended
for glue dot
application
PC Board Land Pattern
N
O
P
0.098
0.126
0.050
2.49
3.20
1.27
0.134
0.126
0.060
3.40
3.20
1.52
0.131
0.126
0.093
3.33
3.20
2.36
0.134
0.155
0.093
3.40
3.94
2.36
0.134
0.155
0.093
3.40
3.94
2.36
0.195
0.155
0.093
4.95
3.94
2.36
0.125
0.126
0.026
3.18
3.20
0.66
Packages
BA
(in.)
(mm)
CA
(in.)
(mm)
CB
(in.)
(mm)
DA
(in.)
(mm)
DB
(in.)
(mm)
EA
(in.)
(mm)
BB
(in.)
(mm)
A
0.246±.020
6.248±.508
0.394±.020
10.008±.508
0.407±.020
10.338±.508
0.455±.020
11.557±.508
0.625±.020
15.875±.508
0.811±.020
20.599±.508
0.202±.010
5.140±.508
B
0.136±.005
3.454±.127
0.159±.005
4.039±.127
0.226±.005
5.74±.127
0.240±.005
6.096±.127
0.273±.005
6.934±.127
0.273±.005
6.934±.127
0.10±.010
2.54±.127
Package Outline Dimensions
C
D
G
0.133 REF
0.110±.010
0.047 ±0.020
3.378 REF
2.794±.254
1.194 ±0.508
0.156 REF
0.220±.010
0.062 Nom.
3.962 REF
5.588±.254
1.575 Nom.
0.222 REF
0.260±.010
0.062 Nom.
5.639 REF
6.604±.254
1.575 Nom.
0.236 REF
0.260±.010
0.062 Nom.
5.994 REF
6.604±.254
1.575 Nom.
0.268 REF
0.417±.010
0.062 Nom.
6.807 REF
10.592±.254
1.575 Nom.
0.268 REF
0.572±.010
0.093 Nom.
6.807 REF
14.529±.254
2.362 Nom.
0.095 REF
0.079±.010
0.050 Nom.
2.41 REF
2.00±.254
1.280 Nom.
I
0.054±.012
1.372±.305
0.078±.012
1.981±.305
0.084±.012
2.134±.305
0.143±.012
3.632±.305
0.143±.012
3.632±.305
0.143±.012
3.632±.305
0.065±.012
1.640±.305
J
0.136±.005
3.454±.127
0.159±.005
4.038±.127
0.222±.005
5.639±.127
0.226±.005
5.740±.127
0.226±.005
5.740±.127
0.273±.005
6.934±.127
0.135±.005
3.420±.127
L
0.150
3.81
0.256
6.50
0.276
7.01
0.317
8.05
0.474
12.040
0.611
15.52
0.078
1.98
M
0.346
8.79
0.524
13.31
0.537
13.64
0.585
14.86
0.742
18.85
1.000
25.4
0.328
8.33
Note 1:
Packages BA and CA are only available with a pedestal base. Packages CB and DA are available in either pedestal or recessed base. Packages DB and EA
are only available in a recessed base.
Note 2:
Test point is .020 above PCB.
Note 3:
Tape and reel dimensions per EIA 481 A except “EA” size which is 12 mm component pitch versus 16mm pitch.
Land pattern dimensions are for reference only
Reel Dimensions
0.795*
20.2
min.
0.512
±.008
13.0
±
.200
1.973
50
min.
Full
Radius
Tape Start Slot
0.098 /
2.5
min. width
0.394 /
10
min. depth
B
Measured
at Hub
C
0.059*
1.5
min.
A
Size A nom.
B
12mm 13” 0.488" +0.078, –0.00
12.4mm +2.0, –0.0
16mm 13” 0.646" +0.078, –0.00
16.4mm +2.0, –0.0
24mm 13” 0.961" +0.078, –0.00
24.4mm +2.0, –0.0
32mm 13” 1.276" +0.078, –0.00
32.4mm +2.0, –0.0
C max.
0.724"
18.4mm
0.882"
22.4mm
1.196"
30.4mm
1.52"
38.4mm
Quantity
2000 pcs. BA or
2500 pcs. BB
1500 pcs. CA or
1000 pcs. CB
1000 pcs. DA or DB
750 pcs. EA
All reels are compatible with major pick-and-place machines
and made in accordance with EIA 481 A (except EA size,
which is 12mm component pitch versus 16mm pitch).
(continued)
34
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Surface Mount Power
O r d e r I N g I N F O r M at I O N
Package
B = 12mm
C = 16mm
D = 24mm
E = 32mm
Package Modifier
A, B sequential
Tolerance
F = 1%
G = 2%
H = 3%
J = 5%
K =10%
Component type
R = resistor
Type of Base
S = standard
R = recessed
½½½½½½½½½½½½½½
Component Modifier Wattage
C = carbon/ceramic
Examples:
composition
1S3 = 1.25W
F = film
2S0 or 2R0 = 2.0W
P = power film
3R5 = 3.5W
W = wire
N = wirewound, non-inductive
T = Tape
and Reel
(optional)
E = RoHS compliant
Resistance Value
Available Jan. 2006
R = Decimal Examples:
K = 1,000
R249 = 0.249 ohms
M = 1,000,000 24R9 = 24.9 ohms
2K49 = 2,490 ohms
(For example, the part
number shown is a wire-
wound resistor, 3.5 watt,
recessed base, 32mm tape
size, first case size [A],
1000 ohms 1% tolerance.)
Standard Part Numbers for Surface Mount Power Resistors
Wirewound
Package style
BA
Base: standard
or recessed
S
Wattage
1.0
RW1S0BA–––
Ohmic value
Part No.
Prefix
CA
S
1.5
RW1S5CA–––
CB
S
2.0
RW2S0CB–––
CB
R
2.0
RW2R0CB–––
DA
S
2.0
RW2S0DA–––
DA
R
2.0
RW2R0DA–––
DB
R
3.0
RW3R0DB–––
EA
R
3.5
RW3R5EA–––
BB
S
0.6
RW0S6BB–––
EA
R
1.0
RC1R0EA–––
Ohmic value
Package style
Base: standard
or recessed
Wattage
Part No.
Prefix
BA
S
1.0
RW1S0BA–––
CA
S
1.5
RW1S5CA–––
Wirewound
CB
S
2.0
RW2S0CB–––
CB
R
2.0
RW2R0CB–––
DA
S
2.0
RW2S0DA–––
DA
R
2.0
RW2R0DA–––
DB
R
3.0
RW3R0DB–––
EA
R
3.5
RW3R5EA–––
BB
S
0.6
RW0S6BB–––
F
K
J
F
F
F
F
F
F
F
F
K
K
K
K
K
F
EA
R
1.0
RC1R0EA–––
K
K
K
K
K
J
0.005
0.010
0.015
0.020
0.025
0.027
0.030
0.033
0.036
0.050
0.056
0.075
0.080
0.100
0.150
0.200
0.220
0.240
0.300
0.330
0.400
0.400
0.470
0.500
0.750
1.00
2.00
Suffix
Tolerance suffix: F = 1% J = 5% K=10%
–––R005–
J
J
F/J
–––R010–
F/J
J
J
F
J
J
–––R015–
F/J
J
–––R020–
J
J
F
J
–––R025–
J
–––R027–
J
–––R030–
F
J
J
–––R033–
J
–––R036–
J
–––R050–
F/J
J
J
F
J
–––R056–
J
–––R075–
J
–––R080–
J
–––R100–
F/J
J
J
F
J
J
–––R150–
J
J
J
–––R200–
J
J
–––R220–
J
–––R240–
J
J
–––R300–
J
J
–––R330–
J
–––R040–
J
–––R400–
J
–––R470–
J
J
J
–––R500–
J
J
J
–––R750–
J
–––1R00–
F/J
J
J
J
J
–––2R00–
J
J
F
F
F
J
F
J
F
F
J
J
J
F
F
F
J
F
F
F
3.30
4.70
5.00
5.60
6.80
7.50
10.00
15.00
20.00
22.00
24.90
33.00
36.00
47.00
50.00
51.00
68.00
82.00
100.00
120.00
180.00
300.00
470.00
1K
4.7K
5K
Suffix
Tolerance suffix: F = 1% J = 5% K=10%
–––3R30–
–––4R70–
–––5R00–
–––5R60–
J
–––6R80–
–––7R50–
–––10R0–
J
J
J
–––15R0–
J
J
–––20R0–
J
–––22R0–
–––24R9–
–––33R0–
–––36R0–
–––47R0–
J
–––50R0–
–––51R0–
J
–––68R0–
–––82R0–
J
–––100R–
J
–––120R–
J
–––180R–
J
–––300R–
J
–––470R–
J
–––1K00–
J
–––4K70–
J
–––5K00–
J
J
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35
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