Four-terminal Current
Sense Resistor
RW Type
Voltage
Electrode
Molded
Resistive
Resin
Element
L
Current
Electrode
W
t
c
f
b
d
g
h
c
a
e
FEATURES
• Extremely low resistance and
high precision tolerance
• Low T.C.R. achieved (±50ppm/
°C)
• Flameproof UL94-V-0
• Marking: Black body color with
white marking
SPECIFICATIONS
TCR max.:
±50 ppm/°C
Rated Ambient Temp:
+70°C
Oper. Temp. Range:
-55°C - +125°C
DERATING
100
80
Percent Rated Power
60
40
20
0
-55
-40
-20
0
20
40
70
60
80
Ambient Temperature,
°C
100
125
140
Power Resistance
Rating
Range
Resistance
Type
(watts) E-12 (mΩ)
Tolerance
RW1S0CK
1
5mΩ - 50mΩ
1%
RW2S0DK
2
5mΩ - 50mΩ
1%
Dielectric
TCR
Withstanding (ppm/°C)
Voltage
Max.
500V
±50
500V
±50
T Y P I C A L S C H E M AT I C
DIMENSIONS
L
W
t
a
b
c
d
e
f
g
h
j
k
m
n
o
p
q
r
s
inches
(mm)
RW1S0CK
0.425±.02
(10.8±0.5)
0.244±.012
(6.2±0.3)
0.083±.008
(2.1±0.2)
0.118±.012
(3.0±0.3)
0.031±.008
(0.8±0.2)
0.055±.02
(1.4±0.5)
0.047±.02
(1.2±0.5)
0.051±.012
(1.3±0.3)
0.051±.012
(1.3±0.3)
0.197±.004
(5.0±0.1)
0.098±.004
(2.5±0.1)
0.39
(10.0)
0.08
(2.0)
0.04
(1.0)
0.12
(3.0)
0.24
0.20
0.06
0.08
0.04
(6.0)
(5.0)
(1.6)
(2.0)
(1.0)
RW2S0DK
Output
S U R F A C E T E M P. R I S E
125
RW2S0DK
Temperature Rise (°C)
100
75
50
25
0
0
20
40
60
80
Percent Rated Power
100
RW1S0CK
Input
Detecting
Circuit
0.504±.02
(12.8±0.5)
0.323±.012
(8.2±0.3)
0.122±.008
(3.1±0.2)
0.197±.012
(5.0±0.3)
0.039±.008)
(1.0±0.2)
0.079±.02
(2.0±0.5)
0.079±.02
(2.0±0.5)
0.087±.012
(2.2±0.3)
0.087±.012
(2.2±0.3)
0.236±.004
(6.0±0.1)
0.118±.004
(3.0±0.1)
0.47
(12.0)
0.09
(2.3)
0.05
(1.15)
0.21
(5.3)
0.31
0.24
0.09
0.13
0.06
(8.0)
(6.0)
(2.2)
(3.2)
(1.6)
R
W
Voltage Terminal
(KELVIN terminal)
Current Terminal
LAND PATTERN
k
j
m
n o
r
s
p
q
PERFORMANCE CHARACTERISTICS
Parameter
Resistance
T.C.R.
Overload
Resistance to
Solder Heat
Rapid Change of
Temperature
Moisture
Resistance
Endurance at
70°C
Low Temperature
Operation
High Temperature
Exposure
Requirement
ΔR
Limit
Typical
Within
—
regulated
tolerance
Within
—
specified
T.C.R.
±1.0%
±1.0%
±1.0%
±1.0%
±1.0%
±2.0%
±1.0%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.25%
±0.25%
Test Method
25°C
+25°C/-55°C and +25°C/+125°C
Rated power x 5 for 5 seconds
260°C ± 5°C, 10 seconds
±1 second
-55°C (30 minutes), +125°C
(30 minutes), 500 cycles
40°C ± 2°C, 90 - 95% RH, 1000
hours, 1.5 hr ON, 0.5 hr OFF cycle
70°C ± 2°C, 1000 hours,
1.5 hr ON, 0.5 hr OFF cycle
-55°C, 1 hour
+125°C, 100 hours
O R D E R I N G I N F O R M AT I O N
RoHS Compliant
½½½½½½½½½½½½½½½
Type &
Power Rating
Ohms
R005 = 0.005½
R050 = 0.05½
Tolerance
F = 1%
D = 0.5%
Packaging
T = tape and reel
(optional)
Current
Sense
Power Rating
Resistor (watts)
The part itself will be
marked as follows:
½½½½
½½½½½½½½½½
Ohms
10m ohms = 0.01½
Tolerance
F = 1%
D = 0.5%
S TA N D A R D PA RT N U M B E R S AVA I L A B L E
Wattage:
Tolerance:
Ohms
0.00500
0.01000
0.02500
0.05000
Series:
1%
1 watt
0.5%
RW1S0CK----DT
RW1S0CKR005DT
RW1S0CKR010DT
RW1S0CKR025DT
RW1S0CKR050DT
RW1S0CK----FT
RW1S0CKR005FT
RW1S0CKR010FT
RW1S0CKR025FT
RW1S0CKR050FT
2 watt
1%
RW2S0DK----FT
RW2S0DKR005FT
RW2S0DKR010FT
RW2S0DKR025FT
RW2S0DKR050FT
Ohmite Mfg. Co.
1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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