RW1/RW2 Series
Surface Mount Four Terminal Current Sense
F e at u R e S
• 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
S e R i e S S P e c i F i c at i O N S
Power Rating Resistance Range
Type
(watts)
E-12 (mΩ)
RW1S0CK
1
5mΩ - 50mΩ
RW2S0DK
2
5mΩ - 50mΩ
Resistance
Tolerance
1%
1%
Dielectric Withstanding
TCR
Voltage
(max. ppm/°C)
500V
±50
500V
±50
Qty./Reel
1000
1000
chaRacteRiSticS
TCR max.
±50 ppm/°C
Rated Ambient Temp.
+70°C
Operating Temp. Range
-55°C - +125°C
Derating
100
80
Surface Temperature Rise
125
RW2S0DK
Temperature Rise (ϒ
C)
100
75
50
25
0
RW1S0CK
Typical Schematic
Input
Detecting
Circuit
Output
Percent Rated Power
60
40
20
0
R
W
Voltage Terminal
(KELVIN terminal)
Current Terminal
-55
-40
-20
0
20
40
70
60
80
Ambient Temperature,
°C
100
125
140
0
20
40
60
80
Percent Rated Power
100
P e R F O R M a N c e D ata
Requirement ∆R
Typical
Parameter Limit
Resistance
Within
regulated
tolerance
T.C.R.
Within
specified
T.C.R.
Overload
±1.0%
Resistance to Solder
±1.0%
Heat
Rapid Change of
±1.0%
Temperature
Moisture Resistance
±2.0%
Endurance at 70°C
±1.0%
Low Temperature
±0.5%
Operation
High Temperature
±0.5%
Exposure
—
Test Method
25°C
—
+25°C/-55°C and +25°C/+125°C
±1.0%
±1.0%
±0.5%
±0.5%
±0.5%
±0.25%
±0.25%
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
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1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
RW1/RW2 Series
Surface Mount Four Terminal Current Sense
(in./mm)
DiMeNSiONS
Voltage
Electrode
Molded
Resistive
Resin
Element
L
W
t
c
f
b
d
g
h
c
a
Current
Electrode
RW1S0CK
RW2S0DK
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)
e
L
W
t
a
b
c
d
e
f
g
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)
Land Pattern
Dimensions for reference only
j
k
m
h
j
k
m
n
o
p
q
r
s
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)
n o
r
s
p
q
O R D e R i N g i N F O R M at i O N
RoHS Compliant
½½½½½½½½½½½½½½
Type &
Power Rating
RW1S0CK = 1 watt
RW2S0DK = 2 watt
Ohms
R005 = 0.005½
R050 = 0.05½
Tolerance
F = 1%
D = 0.5%
Packaging
T = tape and reel
(optional)
Standard Part Numbers for RW Series
Wattage:
Tolerance:
Ohms
0.00500
0.01000
0.02500
0.05000
1%
Series: RW1S0CK----FET
RW1S0CKR005FET
RW1S0CKR010FET
RW1S0CKR025FET
RW1S0CKR050FET
1 watt
0.5%
RW1S0CK----DET
RW1S0CKR005DET
RW1S0CKR010DET
RW1S0CKR025DET
RW1S0CKR050DET
2 watt
1%
RW2S0DK----FET
RW2S0DKR005FET
RW2S0DKR010FET
RW2S0DKR025FET
RW2S0DKR050FET
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%
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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