Ohmite FC4L Series Data Sheet
FC4L Series
FC4L Four Terminal Current Sense
Metal Foil Construction
FEATURES
• FoilConstructionensuresaverystableTCR
(Temperature Coefficient of Resistance)
• Designedforautomaticinsertion
• Industrystandardsizes
• Highheatresistantuse
• Lowheatelectromotiveuse
• Color:white(top)andgreen(bottom)
SERIES SPECIFICATIONS
Ohmite offers the low TCR FC4L series in 0.25 watts up to
5 watts and values down to 1 milli-ohm. Great stability is
achieved by employing a Ni-Cu-Mn resistive element. The
FC4L series affords the user an added advantage of a built in
4-terminal design with 2 larger electrodes for current management and 2 smaller electrodes for current measurement.
Power Resistance TCR Weight
Series Rating Range Tol. (ppm/°C) (g)
FC4L16 0.25W 5m, 10m, 20m, ±1% ±50 0.004
50mΩ ~ 100mΩ
FC4L32 1W 1mΩ ±5% ±100 0.015
2mΩ ±2% ±100
3mΩ ±1% ±100
4mΩ ~ 500mΩ ±1% ±50
FC4L64 2W 1mΩ ±5% ±100 0.038
2mΩ ±2% ±100
3mΩ ±1% ±100
4m ~ 100mΩ ±1% ±50
10m ~ 50mΩ ±0.5% ±50
Power Resistance TCR Weight
Series Rating Range Tol. (ppm/°C) (g)
FC4L76 3W 1m-4mΩ ±1% ±100 0.062
5m-25mΩ ±0.5%, 1% ±50
FC4L90 4W 1m-4mΩ ±1% ±100 0.082
5m-25mΩ ±0.5%, 1% ±50
FC4L110 5W 1mΩ ±5% ±100 0.110
2mΩ ±2% ±50
3mΩ ~ 100mΩ ±1% ±50
10m ~ 50mΩ ±0.5% ±50
Test Condition Maximum ∆R
Max. temperature for rated power
Operating temperature range
Rated voltage
Overload (FC4L16 only)
In-rush current
Rapid change of temperature
Solderability
Endurance
Resistance to soldering heat
Moisture resistance
CHARACTERISTICS
70°C
-55°C ~ +155°C (FC4L16: -40°C ~ +125°C)
√(Rated power x Resistance value) V
Rated power x 1.5 for 5s ±(0.5%+0.0005Ω)
Rated current 10 msec ON, 60 sec OFF, 10 cycles.
(see table next page)
-55°C (30min.)/+155°C (30min.), 100 cycles
(FC4L16: 1000 cycles)
245°C ±5°C for 3 ±0.5 sec. Min. 90% coverage
70°C ±3°C, Rated voltage 1.5h ON, 0.5h OFF, 1000h
(FC4L76 & 90: 100°C)
260°C ±5°C for 10 ±1 sec.
(FC4L76 & 90: 20 ±1)
60°C ±2°C, 90~95% RH, Rated voltage 1.5h ON, 0.5h OFF, 1,000h
(76 & 90: 85 ±2°C, 85±5%RH, 10% Rated power, 1,000h)
±(1.0% +0.0005Ω)
±(1.0% +0.0005Ω)
(FC4L16: ±(2.0%+0.0005Ω))
(FC4L76 & 90: 95%)
±(1.0% +0.0005Ω)
(FC4L76 & 90: ±(3.0%+0.5mΩ))
±(1.0% +0.0005Ω)
(FC4L16: ±0.5%)
(FC4L76 & 90: No evidence of
mechanical damage)
±(2.0% +0.0005Ω)
(FC4L16: ±1.0%)
(FC4L76 & 90: ±(3% +0.0005Ω))
8
100
Percent Rated Power
Ambient
FC4L16
Others
Temperature, °C
60
20
0
80
40
050 100 125 15570-55
R010
3
4
1
W
L
a
2
5
1. Alumina substrate
2. Resistive element
(Ni-Cu-Mn alloy)*
3. Electrode (Ni, Sn)*
4. Protective coating
(Epoxy resin)
5. Marking (Epoxy
resin): wider mark
indicates “V” term.
*Dependent on size and value
t
d
c
b
“V” term. “I” term.
a
b
e
c
d
FC4L Series
Temperature °C
Time (sec.)
Preheating
130 ~ 180℃
60 ~ 90 sec.
Heating
Peak
200
50
300
250
100
150
Over 220℃
30s ~ 90s
240 ~ 260℃ Max. 10s
W
1
AH N
W
2
E
FC4L Four Terminal Current Sense
Metal Foil Construction
CHARACTERISTICS
Series Rating Range Power Current
FC4L16 0.25 watt 5m, 10mΩ 2.5W 5A
FC4L32 1 watt 1mΩ~9mΩ 25W 45A
FC4L64 2 watt 1mΩ~9mΩ 100W 85A
FC4L76 3 watt 1mΩ~9mΩ 110W 90A
FC4L90 4 watt 1mΩ~9mΩ 120W 95A
FC4L110 5 watt 1mΩ~50mΩ 100W 100A
In-rush current = √(in-rush power/resistance
value), or max. current, whichever is smaller
Power Resistance In-rush Max.
10mΩ~500mΩ 12.5W 24A
10mΩ~100mΩ 50W 35A
10mΩ~***mΩ 55W 40A
10mΩ~***mΩ 60W 45A
DeratingIn-rush current
DIMENSIONS
Recommended Reflow
Temperature Profile
For lead free soldering (Sn-Ag-Cu
solder)
Preheating: 130°~180° 60s~90s
Heating: Over220° 30s~90s
Peak: 240°~260° Max.10s
Max.numberofreflow:2
Land Pattern
Rating (in.±.008/mm ±0.20) (in./mm) mm ±0.15 mm ±0.1 mm ±0.15 mm
FC4L16 0.25 watt 0.063 / 1.60 0.031 / 0.8 0.010 / 0.26 0.30 ±.2 0.3 ±.2 1.0 ±.2 0.5 +.2/-.05
FC4L32 1 watt 0.126 / 3.20 0.063 / 1.6 0.014 / 0.35 0.35 0.2 2.6 0.5 +.2/-.05
FC4L64 2 watt 0.251 / 6.40 0.126 / 3.2 0.020 / 0.5 0.7 0.5 5.2 0.5 +.2/-.05
FC4L76 3 watt 0.30 / 7.60 0.15 / 3.8 0.02 / 0.55 0.75 0.60 6.15 0.60 ±.20
FC4L90 4 watt 0.35 / 9.00 0.18 / 4.5 0.03 / 0.65 0.90 0.75 7.25 0.60 ±.20
FC4L110 5 watt 0.433 / 11.0 0.197 / 5.0 0.028 / 0.7 1.4 1.1 8.5 0.5 +.2/-.05
L W a b c d t
±0.3mm ±0.3mm ±0.2mm ±0.2mm ±0.2mm ±0.3mm
±0.3mm ±0.3mm ±0.2mm ±0.2mm ±0.2mm ±0.3mm
PACKAGING SPECIFICATIONS
Reel
FC4L16 FC4L32 & 64 FC4L76 & 90 FC4L110
A 7.087 (180 +0/-3) 7.087 (180 +0/-3) 7.087 (180 +1.0/-3.0) 7.087 (180 ±2.0)
H 0.512 (13 ±0.2) 0.512 (13 ±0.2) 0.512 (13 ±0.2) 0.512 (13 ±0.2)
E 0.079 (2.0 ±0.5) 0.079 (2.0 ±0.5) 0.079 (2.0 ±0.5) 0.079 (2.0 ±0.5)
N 2.362 (60 +1/-0) 2.362 (60 +1/-0) 2.362 (60 +1/-0) 0.827 (21 ±0.8)
W1 0.354 (9.0 ±0.3) 0.512 (13.0 ±0.3) 0.827 (21 ±0.8) 1.000 (25.4 ±1.0)
W2 0.512 (13.0 ±0.3) 0.669 (17.0 ±1.4) 0.669 (17.0 ±.3) 1.157 (29.4 ±1.0)
(mm) a b c d e
FC4L16 0.25 1.2 0.40 0.30 1.2
FC4L32 0.4 2.7 0.35 0.3 2.7
FC4L64 2.0 4.4 0.7 0.5 5.4
FC4L76 2.4 4.80 0.95 0.45 6.60
FC4L90 2.8 5.60 1.10 0.55 7.80
FC4L110 3.2 5.6 1.6 1.1 8.7
(continued)
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