FCSL Series
Metal Foil Current Sense
Ohmite continues to add to its complement
of Current Sense offerings with the FCSL
Series. FCSL incorporates proven metal foil
technology to produce the ultimate in a cur-
rent sense resistor. FCSL features the effec-
tive combination of very low and stable TCRs
(Temperature Coefficient of Resistance) avail-
able in a wide selection of very low ohmic
values. Power ratings up to 10 Watts makes
FCSL the ideal choice for your current sens-
ing applications.
S e r i e S S p e C i F i C at i o n S
F e at u r e S
• Foil Construction ensures a very stable TCR (Temperature
Coefficient of Resistance)
• Designed for automatic insertion
• Industry standard sizes
• High heat resistant use
• Low heat electromotive use
• Color: white (top) and green (bottom)
CharaCteriStiCS
Test Condition
Overload
(10W) Rated power x1.5, 5s
Max. temperature
70°C
for rated power
(10W: 100°C)
Operating
-55°C ~ +155°C
temp. range
Rated voltage
√(Rated power x Resistance
value) V
In-rush current*
Rated current 10 msec ON,
60 sec OFF, 10 cycles* (see
table below)
Rapid change of
-55°C (30min.)/+155°C
temperature
(30min.), 100 cy.
-40℃ (30min), Room temp
(3min), +125℃ (30min),
Room temp (3min), 1000 cy.,
FCSL150 only
Solderability
245°C ±5°C for 3 ±0.5 sec.
Endurance at
70°C ±3°C, Rated voltage
70°C
1.5h ON, 0.5h OFF, 1000h
Resistance to
260°C ±5°C for 10 ±1 sec.
soldering heat
Moisture
60°C ±2°C, 90~95% RH,
resistance
Rated voltage 1.5h ON, 0.5h
OFF, 1000h
±(1.0% +0.0005Ω)
Maximum ∆R
±(1.0%+0.0005Ω)
Power Resistance
TCR Weight
Series
Rating Range (mΩ) Tol. (ppm/°C) (g)
FCSL64 2.0W
1m
±5% ±150 0.036
2m
±2% ±100
3m ~ 100m ±1%
±50
10m ~ 50mΩ ±0.5% ±50
FCSL76 3.0W
1m
±5% ±150 0.050
2m
±2% ±100
3m ~ 100m ±1%
±50
FCSL90 4.0W
1m
±5% ±150 0.071
2m
±2% ±100
3m ~ 100m ±1%
±50
FCSL110 5.0W
1m
±5% ±150 0.096
2m
±2% ±100
3m ~ 100m ±1%
±50
10m ~ 50mΩ ±0.5% ±50
FCSL150 10.0W
1m
±5% ±100 0.316
2m
±2% ±100
3m ~ 100m ±1% ±100
(>9m:±50)
Recommended Reflow
Temperature Profile
(10W)
±(1.0% +0.0005Ω)
±0.6%
Min. 90% cover-
age
±(1.0% +0.0005Ω)
±(0.5% +0.0005Ω)
±(2.0% +0.0005Ω)
Derating
100
Percent Rated Power
80
60
40
20
0
-55
For lead free soldering (Sn-Ag-Cu
solder)
Preheating: 130° ~ 180° 60s ~ 90s
Heating: Over 220° 30s ~ 90s
Peak:
240° ~ 260° Max. 10s
Max. number of reflow: 2
300
Temperature °C
±(1.0%+0.0005Ω)
Terminal strength 10W:
Bending width: 2mm
for 10s±1s, Glass epoxy sub-
strate 1.6mm thick
*In-rush Current
1mΩ~10mΩ
Rated In-rush
Max.
Series Wattage Power Current
FCSL64
2W
225W
125A
FCSL76
3W
325W
150A
FCSL90
4W
440W
180A
FCSL110
5W
600W
240A
FCSL150
10W
700W
270A
12mΩ~100mΩ
In-rush
Max.
Power Current
150W
70A
210W
80A
300W
100A
440W
120A
470W
140A
0
50 70 100
Ambient Temperature,
°C
155
250
200
150
100
50
Peak
240 ~ 260℃ Max. 10s
Preheating
130 ~ 180℃
60 ~ 90 sec.
Over 220℃
30s ~ 90s
Heating
In-rush current = √(in-rush
power/resistance value), or
max. current, whichever is
smaller
Time (sec.)
6
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