Ohmite Mfg. Co. 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 13
FEATURES
• 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 performance:
1. Carbon and Ceramic compo-
sition for surge and low induc-
tance
2. Metal film for high ohmic value
and low T.C.
3. Wire element for inrush cur-
rent 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
Surface Mount Power
RC Series: carbon composition (1/4 & 1/2 watt)
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
Performance SPecificationS
Power Maximum Resistance range Temp. Coefficient Dielectric Tape Size Quantity
Part Number (watts)* voltage 1% tol. 5% tol. 10% tol. 0.1Ω–1Ω 1Ω–10Ω 10Ω+ Withstanding 13” reels per reel
RC0S2CA––––– 0.25 250 — — 2.2Ω–5.6M — ±400 ±400 1000V 16mm 1500
RC0R5DB––––– 0.50 350 — — 2.2Ω–20M — ±400 ±400 1000V 24mm 1000
RW0S6BB––––– 0.6 50 0.010Ω–1K 0.005Ω–1K ±90 ±50 ±20 1000V 12mm 2500
RF0S8BA––––– 0.8 200 1Ω–5M — — ±100 ±100 1000V 12mm 2000
RW1S0BA––––– 1.0 50 0.005Ω–1K 0.005Ω–1K ±90 ±50 ±20 1000V 12mm 2000
RF1S0CA––––– 1.0 350 10Ω–1M 1Ω–10M — ±200 ±100 1000V 16mm 1500
RC1R0EA––––– 1.0 500 3.3-100K(10% tol only) -1300 1000V 32mm 750
RP1S3CA––––– 1.25 350 — 1Ω–1M — ±250 ±250 1000V 16mm 1500
RP1S5CA––––– 1.5 75 0.005Ω–1.5K 0.005Ω–1.5K ±90 ±250 ±250 1000V 16mm 1500
RP1S5CB––––– 1.5 350 — 1Ω–1M — ±250 ±250 1000V 16mm 1000
RP1R5CB–––––
RW2S0CB––––– 2.0 100 0.005Ω–5K 0.005Ω–5K ±90 ±50 ±20 1000V 16mm 1000
RW2R0CB–––––
RP2S0DA––––– 2.0 500 — 1Ω–1M — ±250 ±250 1000V 24mm 1000
RP2R0DA–––––
RW2S0DA––––– 2.0 100 0.005Ω–5K 0.005Ω–5K ±90 ±50 ±20 1000V 24mm 1000
RW2R0DA–––––
RP2R5DB––––– 2.5 500 — 1Ω–1M — ±250 ±250 1000V 24mm 1000
RW3R0DB––––– 3.0 200 0.005Ω–13K 0.005Ω–13K ±90 ±50 ±20 1000V 24mm 1000
RP3R0EA––––– 3.0 750 — 1Ω–1M — ±250 ±250 1000V 32mm 750
RW3R5EA––––– 3.5 350 0.005Ω–25K 0.005Ω–25K ±90 ±50 ±20 1000V 32mm 750
RM0R7EA––––– 0.75 2500 1KΩ–1000M 1KΩ–1000M — — ±50 1000V 32mm 750
*25°C ambient
Flexible
J-bend
Standard
pedestal mount
Recessed-base
mount
Dimensions (in. / mm)
Series* Wattage Ohms Length Height Width Voltage
RC0S2CA 0.25 2.2–5.6M 0.394 / 10.01 0.159 / 4.04 0.159 / 4.04 250
RC0R5DB 0.50 2.2–20M 0.625 / 15.88 0.226 / 5.74 0.273 / 6.93 350
RW0S6BB 0.6 0.010-1K 0.202 / 5.14 0.135 / 3.42 0.1 / 2.54 50
RF0S8BA 0.80 1.0–10M 0.246 / 6.25 0.136 / 3.45 0.136 / 3.45 200
RW1S0BA 1.00 0.005–1K 0.246 / 6.25 0.136 / 3.45 0.136 / 3.45 50
RF1S0CA 1.00 1.0–10M 0.394 / 10.01 0.159 / 4.04 0.159 / 4.04 350
RC1R0EA 1.00 3.3–100K 0.811 / 20.60 0.273 / 6.93 0.273 / 6.93 500
RP1S3CA 1.25 1.0–1M 0.394 / 10.01 0.159 / 4.04 0.159 / 4.04 350
RW1S5CA 1.50 0.005–1.5K 0.394 / 10.01 0.159 / 4.04 0.159 / 4.04 75
RP1S5CB 1.50 1.0–1M 0.407 / 10.34 0.222 / 5.64 0.226 / 5.74 350
RP1R5CB 1.50 1.0–1M 0.407 / 10.34 0.222 / 5.64 0.226 / 5.74 350
RW2S0CB 2.00 0.005–5K 0.407 / 10.34 0.222 / 5.64 0.226 / 5.74 100
RW2R0CB 2.00 0.005–5K 0.407 / 10.34 0.222 / 5.64 0.226 / 5.74 100
RP2S0DA 2.00 1.0–1M 0.455 / 11.56 0.226 / 5.74 0.24 / 6.10 500
RP2R0DA 2.00 1.0–1M 0.455 / 11.56 0.226 / 5.74 0.24 / 6.10 500
RW2S0DA 2.00 0.005–5K 0.455 / 11.56 0.226 / 5.74 0.24 / 6.10 100
RW2R0DA 2.00 0.005–5K 0.455 / 11.56 0.226 / 5.74 0.24 / 6.10 100
RP2R5DB 2.50 1.0–1M 0.655 / 16.64 0.226 / 5.74 0.273 / 6.93 500
RW3R0DB 3.00 0.005–13K 0.625 / 15.88 0.226 / 5.74 0.273 / 6.93 200
RP3R0EA 3.00 1.0–1M 0.811 / 20.60 0.273 / 6.93 0.273 / 6.93 750
RW3R5EA 3.50 0.005–25K 0.811 / 20.60 0.273 / 6.93 0.273 / 6.93 350
Military grade versions available; contact Ohmite.
*Last two digits designate package size
(continued)
100
Percent Rated Power
Ambient Temperature, °C
60
20
0
80
40
25 50 100 150750125
DERATING
14 Ohmite Mfg. Co. 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
Package Outline Dimensions PC Board Land Pattern
Packages A B C D G I J L M N O P
BA (in.) .246±.020 .136±.005 .133 REF .110±.010 .047 Nom. .054±.012 .136±.005 .150 .346 .098 .126 .050
(mm) 6.248±.508 3.454±.127 3.378 REF 2.794±.254 1.194 Nom. 1.372±.305 3.454±.127 3.81 8.79 2.49 3.20 1.27
CA (in.) .394±.020 .159±.005 .156 REF .220±.010 .062 Nom. .078±.012 .159±.005 .256 .524 .134 .126 .060
(mm) 10.008±.508 4.039±.127 3.962 REF 5.588±.254 1.575 Nom. 1.981±.305 4.038±.127 6.50 13.31 3.40 3.20 1.52
CB (in.) .407±.020 .226±.005 .222 REF .260±.010 .062 Nom. .084±.012 .222±.005 .276 .537 .131 .126 .093
(mm) 10.338±.508 5.74±.127 5.639 REF 6.604±.254 1.575 Nom. 2.134±.305 5.639±.127 7.01 13.64 3.33 3.20 2.36
DA (in.) .455±.020 .240±.005 .236 REF .260±.010 .062 Nom. .143±.012 .226±.005 .317 .585 .134 .155 .093
(mm) 11.557±.508 6.096±.127 5.994 REF 6.604±.254 1.575 Nom. 3.632±.305 5.740±.127 8.05 14.86 3.40 3.94 2.36
DB (in.) .625±.020 .273±.005 .268 REF .417±.010 .062 Nom. .143±.012 .226±.005 .474 .742 .134 .155 .093
(mm) 15.875±.508 6.934±.127 6.807 REF 10.592±.254 1.575 Nom. 3.632±.305 5.740±.127 12.040 18.85 3.40 3.94 2.36
EA (in.) .811±.020 .273±.005 .268 REF .572±.010 .093 Nom. .143±.012 .273±.005 .611 1.000 .195 .155 .093
(mm) 20.599±.508 6.934±.127 6.807 REF 14.529±.254 2.362 Nom. 3.632±.305 6.934±.127 15.52 25.4 4.95 3.94 2.36
BB (in.) .202±.010 .10±.010 .095 REF .079±.010 .050 Nom. .065±.012 .135±.005 0.078 0.328 0.125 0.126 0.026
(mm) 5.140±.508 2.54±.127 2.41 REF 2.00±.254 1.280 Nom. 1.640±.305 3.420±.127 1.98 8.33 3.18 3.20 0.66
J
I
C
B
K=0.006 Ref.
D
A
E
GH
Note 1 F=0.005 ±.001
Note 2
L
O
M
P
N
Recommended
for glue dot
application
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.
Size A nom. B C max. Quantity
12mm 13” 0.488" +0.078, –0.00 0.724" 2000 pcs. BA or
12.4mm +2.0, –0.0 18.4mm 2500 pcs. BB
16mm 13” 0.646" +0.078, –0.00 0.882" 1500 pcs. CA or
16.4mm +2.0, –0.0 22.4mm 1000 pcs. CB
24mm 13” 0.961" +0.078, –0.00 1.196" 1000 pcs. DA or DB
24.4mm +2.0, –0.0 30.4mm
32mm 13” 1.276" +0.078, –0.00 1.52" 750 pcs. EA
32.4mm +2.0, –0.0 38.4mm
reel DimenSionS
All reels are compatible with major pick-and-place machines and made
in accordance with EIA 481 A (except EA size, which is 12mm compo-
nent pitch versus 16mm pitch).
A
0.795*
20.2
min.
0.512 ±.008
13.0
±
.200
C
B
1.973
50
min.
0.059*
1.5
min.
Full
Radius
Tape Start Slot
Measured
at Hub
0.098 /
2.5
min. width
0.394 /
10
min. depth
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 continu-
ous.
100% 200% 300%
200
180
160
140
120
100
80
60
40
20
Temperature rise, °C
Percent Rated power
Alumina
Solder joint
FR4
Package limit hot spot temperature rise
(continued)
Surface Mount Power
(continued)
Land pattern dimensions are for reference only
0.02
500
400
300
200
100
Ohms
0.04 0.06 0.08 0.10
Typical TCR for
less than 0.1Ω SMD
resistors (PPM/°C)
Ohmite Mfg. Co. 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 15
StanDarD Part numberS for Surface mount Power reSiStorS
orDerinG information
RW1S0BA–––
RW1S5CA–––
RW2S0CB–––
RW2R0CB–––
RW2S0DA–––
RW2R0DA–––
RW3R0DB–––
RW3R5EA–––
RW0S6BB–––
RC1R0EA–––
BA CA CB CB DA DA DB EA BB EA
S S S R S R R R S R
1.0 1.5 2.0 2.0 2.0 2.0 3.0 3.5 0.6 1.0
Wirewound
3.30 –––3R30– K
4.70 –––4R70– K
5.00 –––5R00– F
5.60 –––5R60– J
6.80 –––6R80– K
7.50 –––7R50– J F
10.00 –––10R0– J J J F K
15.00 –––15R0– J J F K
20.00 –––20R0– J
22.00 –––22R0– F K
24.90 –––24R9– F
33.00 –––33R0– F K
36.00 –––36R0– F
47.00 –––47R0– J J F K
50.00 –––50R0– J
51.00 –––51R0– J
68.00 –––68R0– K
82.00 –––82R0– J
100.00 –––100R– J F K
120.00 –––120R– J
180.00 –––180R– J
300.00 –––300R– J
470.00 –––470R– J
1K –––1K00– J K
4.7K –––4K70– J
5K –––5K00– J
0.005 –––R005– J J F/J
0.010 –––R010– F/J J J F J J J F
0.015 –––R015– F/J J F
0.020 –––R020– J J F J J F
0.025 –––R025– J
0.027 –––R027– J
0.030 –––R030– F J J J F
0.033 –––R033– J
0.036 –––R036– J
0.050 –––R050– F/J J J F J J F
0.056 –––R056– J
0.075 –––R075– J F
0.080 –––R080– J J
0.100 –––R100– F/J J J F J J J F
0.150 –––R150– J J J
0.200 –––R200– J J J
0.220 –––R220– J
0.240 –––R240– J J F
0.300 –––R300– J J
0.330 –––R330–
J
0.400 –––R040– J
0.400 –––R400– J
0.470 –––R470– J J J F
0.500 –––R500– J J J J
0.750 –––R750– J F
1.00 –––1R00– F/J J J J J F
2.00 –––2R00– F
RW1S0BA–––
RW1S5CA–––
RW2S0CB–––
RW2R0CB–––
RW2S0DA–––
RW2R0DA–––
RW3R0DB–––
RW3R5EA–––
RW0S6BB–––
RC1R0EA–––
Ohmic value
Part No.
Prefix
Suffix Tolerance suffix: F = 1% J = 5% K=10%
Package style
Base: standard
or recessed
Wattage
BA CA CB CB DA DA DB EA BB EA
S S S R S R R R S R
1.0 1.5 2.0 2.0 2.0 2.0 3.0 3.5 0.6 1.0
Wirewound
Ohmic value
Part No.
Prefix
Suffix Tolerance suffix: F = 1% J = 5% K=10%
Package style
Base: standard
or recessed
Wattage
(For example, the part number
shown is a wirewound resistor, 3.5
watt, recessed base, 32mm tape
size, first case size [A], 1000 ohms
1% tolerance.)
Component type
R = resistor
Component Modifier
C = carbon/ceramic
composition
F = film
P = power film
W = wire
N = wirewound, non-inductive
Wattage
Examples:
1S3 = 1.25W
2S0 or 2R0 = 2.0W
3R5 = 3.5W
Type of Base
S = standard
R = recessed
Package
B = 12mm
C = 16mm
D = 24mm
E = 32mm
Package Modifier
A, B sequential
Resistance Value
R = Decimal
K = 1,000
M = 1,000,000
Tolerance
F= 1%
G= 2%
H= 3%
J= 5%
K=10%
Examples:
R249 = 0.249 ohms
24R9 = 24.9 ohms
2K49 = 2,490 ohms
T = Tape
and Reel
(optional)
E = RoHS compliant
Available Jan. 2006
Surface Mount Power
(continued)
Temp. cycle Load Life Immersion
(-55°C to 125°C, (1000 hours (260°C for Momentary
Construction 1000 cycles) at 25°C) 10 sec.) Overload
RC Carbon/Ceramic Composition ±4.0%+.05Ω ±10.0%+.05Ω ±3.0%+.05Ω 6.3x rated power for 5 sec.
RF Metal Film ±0.5%+.05Ω ±0.5%+.05Ω ±0.1%+.05Ω 2x rated power for 0.1 sec.
RW Wirewound ±0.5%+.05Ω ±3.0%+.05Ω ±0.1%+.05Ω 5x rated power for 5 sec.
RP Power Film ±3.0%+.05Ω ±5.0%+.05Ω ±0.5%+.05Ω 2x rated power for 0.1 sec.
RN Wirewound, Non-inductive ±0.5%+.05Ω ±3.0%+.05Ω ±0.1%+.05Ω 5x rated power for 5 sec.
ALL models: Leaching (260°C Solder immersion, 60 sec.)....................... No visible leaching
Thermal Shock (Units at -55°C, then rated power applied).. No mechanical damage
Flammability ......................................................................... UL Material rating, UL94V0
Performance Data
