F E A T U R E S
S P E C I F I C A T I O N 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
TCR max.: ±50 ppm/°C
Rated Ambient Temp: +70°C
Oper. Temp. Range:
-55°C - +125°C
RW1/RW2 Series
Surface Mount
Four Terminal Current Sense
Voltage
Electrode
Molded
Resin
Resistive
Element
Current
D E R A T I N G
Electrode
100
L
W
80
60
40
20
0
e
t
f
d
g
a
c
b
h
c
Power Resistance
Rating Range
(watts) E-12 (mΩ) Tolerance
1
2
Dielectric
TCR
Resistance Withstanding (ppm/°C) Qty./
Type
Voltage
500V
500V
Max. Reel
±50 1000
±50 1000
-55 -40
-20
0
20
40 70 60
80
100
125 140
Ambient Temperature, °C
RW1S0CK
RW2S0DK
5mΩ - 50mΩ
5mΩ - 50mΩ
1%
1%
T Y P I C A L S C H E M A T I C
S U R F A C E T E M P. R I S E
Input
Detecting
Circuit
125
D I M E N S I O N S inches (mm)
RW2S0DK
100
RW1S0CK
RW2S0DK
R
Output
W
L
W
t
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)
0.504±.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)
75
Voltage Terminal
(KELVIN terminal)
a
RW1S0CK
b
50
Current Terminal
c
d
e
f
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)
0.079±.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)
25
0
L A N D P A T T E R N
Land pattern dimensions are for refer-
ence only
g
k
h
j
0.098±.004 (2.5±0.1)
0.39 (10.0)
0.118±.004 (3.0±0.1)
0.47 (12.0)
m
0
20
40
60
80
100
j
Percent Rated Power
k
0.08 (2.0)
0.09 (2.3)
m
n
0.04 (1.0)
0.05 (1.15)
0.12 (3.0)
0.21 (5.3)
o
p
q
r
0.24 (6.0)
0.20 (5.0)
0.06 (1.6)
0.08 (2.0)
0.04 (1.0)
0.31 (8.0)
0.24 (6.0)
0.09 (2.2)
0.13 (3.2)
0.06 (1.6)
n o
r
s
s
p
q
P E R F O R M A N C E C H A R A C T E R I S T I C S
O R D E R I N G I N F O R M AT I O N
Requirement ΔR
Parameter
Limit
Typical
Test Method
RoHS Compliant
Resistance
Within
regulated
tolerance
—
25°C
� ꢀ ꢁ ꢂ ꢃ ꢄ ꢅ � ꢃ ꢃ ꢆ ꢇ ꢈ ꢉ
Type &
Ohms
Tolerance
Packaging
T.C.R.
Within
specified
T.C.R.
—
+25°C/-55°C and +25°C/+125°C
Power Rating
RW1S0CK = 1 watt
RW2S0DK = 2 watt
R005 = 0.005� F = 1%
T = tape and reel
(optional)
R050 = 0.05�
D = 0.5%
Overload
±1.0%
±1.0%
±1.0%
Rated power x 5 for 5 seconds
Current
Sense
Power Rating
Resistance to
Solder Heat
±1.0%
±0.5%
±0.5%
±0.5%
260°C ± 5°C, 10 seconds
±1 second
Resistor (watts)
Rapid Change of
Temperature
±1.0%
±2.0%
±1.0%
-55°C (30 minutes), +125°C
(30 minutes), 500 cycles
The part itself will be
marked as follows:
ꢄꢂ�ꢁ
ꢁꢃꢊꢋꢌꢍꢊꢎꢋꢏ
Tolerance
Moisture
Resistance
40°C ± 2°C, 90 - 95% RH, 1000
hours, 1.5 hr ON, 0.5 hr OFF cycle
F = 1%
D = 0.5%
Ohms
10m ohms = 0.01�
Endurance at
70°C
70°C ± 2°C, 1000 hours,
1.5 hr ON, 0.5 hr OFF cycle
Low Temperature ±0.5%
Operation
±0.25% -55°C, 1 hour
S TA N D A R D P A R T N U M B E R S F O R R W S E R I E S
High Temperature ±0.5%
Exposure
±0.25% +125°C, 100 hours
Wattage:
1 watt
2 watt
1%
Tolerance:
1%
0.5%
Ohms
Series: RW1S0CK----FET
RW1S0CK----DET
RW2S0DK----FET
Check product availability at www.ohmite.com
0.00500
0.01000
0.02500
0.05000
RW1S0CKR005FET RW1S0CKR005DET RW2S0DKR005FET
RW1S0CKR010FET RW1S0CKR010DET RW2S0DKR010FET
RW1S0CKR025FET RW1S0CKR025DET RW2S0DKR025FET
RW1S0CKR050FET RW1S0CKR050DET RW2S0DKR050FET
Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 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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