Surface Mount
Standard Recessed-base
pedestal mount
mount
Power
1 1
RC Series: carbon composition ( /4 & /2 watt)
1 Flexible
RC Series: ceramic composition (above /2 watt)
J-bend
RF Series: metal film
RW Series: wirewound
RP Series: power film
RM Series: high voltage thick film
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 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 0.005
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: -55C to +150C
SerIeS SPeCIFICatIONS
Power Maximum Resistance range Temp. Coefficient Dielectric Tape Size Quantity
Part Number (watts)* voltage 1% tol. 5% tol. 10% tol. 0.11 110 10+ Withstanding 13 reels per reel
RC0S2CA 0.25 250 2.25.6M 400 400 1000V 16mm 1500
RC0R5DB 0.50 350 2.220M 400 400 1000V 24mm 1000
RW0S6BB 0.6 50 0.0101K 0.0051K 90 50 20 1000V 12mm 2500
RF0S8BA 0.8 200 15M 100 100 1000V 12mm 2000
RW1S0BA 1.0 50 0.0051K 0.0051K 90 50 20 1000V 12mm 2000
RF1S0CA 1.0 350 101M 110M 200 100 1000V 16mm 1500
RC1R0EA 1.0 500 3.3-100K (10% tol only) -1300 1000V 32mm 750
RP1S3CA 1.25 350 11M 250 250 1000V 16mm 1500
RW1S5CA 1.5 75 0.0051.5K 0.0051.5K 90 250 250 1000V 16mm 1500
RP1S5CB 1.5 350 11M 250 250 1000V 16mm 1000
RP1R5CB
RW2S0CB 2.0 100 0.0055K 0.0055K 90 50 20 1000V 16mm 1000
RW2R0CB
RP2S0DA 2.0 500 11M 250 250 1000V 24mm 1000
RP2R0DA
RW2S0DA 2.0 100 0.0055K 0.0055K 90 50 20 1000V 24mm 1000
RW2R0DA
RP2R5DB 2.5 500 11M 250 250 1000V 24mm 1000
RW3R0DB 3.0 200 0.00513K 0.00513K 90 50 20 1000V 24mm 1000
RP3R0EA 3.0 750 11M 250 250 1000V 32mm 750
RW3R5EA 3.5 350 0.00525K 0.00525K 90 50 20 1000V 32mm 750
RM0R7EA 0.75 2500 1K1000M 1K1000M 50 1000V 32mm 750
*25C ambient. E24 values standard; contact Ohmite for custom values.
(continued)
32 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.comSurface Mount Power
PerFOrMaNCe data
Temp. cycle Load Life Immersion
Derating
(-55C to 125C, (1000 hours (260C for Momentary
Construction 1000 cycles) at 25C) 10 sec.) Overload 100
RC Carbon/Ceramic Comp. 4.0%+.05 10.0%+.05 3.0%+.05 6.3x rated power for 5 sec.
80
RF Metal Film 0.5%+.05 0.5%+.05 0.1%+.05 2x rated power for 0.1 sec.
60
RW Wirewound 0.5%+.05 3.0%+.05 0.1%+.05 5x rated power for 5 sec.
RP Power Film 3.0%+.05 5.0%+.05 0.5%+.05 2x rated power for 0.1 sec.
40
RN Wirewound, Non-inductive 0.5%+.05 3.0%+.05 0.1%+.05 5x rated power for 5 sec.
20
ALL models: Leaching (260C Solder immersion, 60 sec.)....................... No visible leaching
0
Thermal Shock (Units at -55C, then rated power applied).. No mechanical damage
0 25 50 75 100 125 150
Flammability ......................................................................... UL Material rating, UL94V0
Ambient Temperature, C
TCR Recommended Solder Profile
500 300
Soldering Preheating: 145C 15, max. 120 sec.
10 sec.
250
Soldering: min. 220C, max. 60 sec.
400 Typical TCR for
60 sec.
200
Max. Temp.: 260C 5, 10 sec.
Preheating
less than 0.1 SMD Cooling
120 sec.
(RC only: 250C 5, 3 sec.)
150
resistors (PPM/C)
300
100
200
50
0
100
0 50 100 150 200 250
Time (sec.)
0.02 0.04 0.06 0.08 0.10
Ohms
200
The temperature rise graph
Package limit hot spot temperature rise
data was obtained by a
180
selection of test substrate
Alumina
size and trace width for
160
each resistor size to limit
FR4 operating temperatures to
140 safe values.
The operating temperature
120
safe rises are either 100C
substrate temperature rise
100
or 180C package hot spot
temperature rise at 25C
80
ambient.
FR4: 0.062 in. thick; 0.062
60
in. traces
40
Alumina: 0.040 in. thick;
Solder joint
0.010 in. traces
20
Molding material rated at
205C continuous.
100% 200% 300%
Percent Rated power
rC SerIeS: bake PrOCedure
RC SERIES ONLY A. Heat Treatment B. Frequency of C. Cautions
heat treatment
110C 10C Solderability: may be affected due to oxidization of lead wire
15 hours 1 time only
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.
1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com 33
Temperature rise, C
Temperature C
Percent Rated Power