RES-RW1-RW2 Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Extremely low resistance and high precision tolerance

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

Power Rating
Type
(watts)
RW1S0CK
1
RW2S0DK
2
S E R IE S S P ECI F ICATI O N S
Resistance Range Resistance Dielectric Withstanding
E-12 (mΩ)
Tolerance
Voltage
5mΩ - 50mΩ
1%
500V
5mΩ - 50mΩ
1%
500V
TCR
(max. ppm/°C)
±50
±50
Qty./Reel
1000
1000
TCR max. ±50 ppm/°C
Rated Ambient Temp. +70°C
Operating Temp. Range -55°C - +125°C
Typical Schematic
Input
Detecting
Circuit
R
Output
W
Voltage Terminal
(KELVIN terminal)
Current Terminal
characteristics
Derating
100
80
Surface Temperature Rise
125
RW2S0DK
100
60
75
RW1S0CK
40
50
20
25
0
-55 -40 -20
0 20 40 70 60 80 100
Ambient Temperature, °C
125 140
0
0 20 40 60 80 100
Percent Rated Power
P E R F O R M A N CE D ATA
Requirement ∆R
Parameter Limit Typical
Test Method
Resistance Within
—
regulated
tolerance
25°C
T.C.R. Within
—
specified
T.C.R.
+25°C/-55°C and +25°C/+125°C
Overload ±1.0% ±1.0% Rated power x 5 for 5 seconds
Resistance to Solder ±1.0%
Heat
±1.0% 260°C ± 5°C, 10 seconds ±1 second
Rapid Change of ±1.0%
Temperature
±0.5% -55°C (30 minutes), +125°C (30 minutes), 500 cycles
Moisture Resistance ±2.0%
±0.5% 40°C ± 2°C, 90 - 95% RH, 1000 hours, 1.5 hr ON,
0.5 hr OFF cycle
Endurance at 70°C ±1.0% ±0.5% 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
High Temperature ±0.5%
Exposure
±0.25% +125°C, 100 hours
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