FUZETEC TECHNOLOGY CO., LTD.
NO.
PQ04-44E
Product Specification and Approval Sheet
Version
5
Page
1/4
NOTE : Specification subject to change without notice.
Surface Mountable PTC Resettable Fuse: Lo Rho FSMD1812 Series
1. Summary
(a) RoHS Compliant & Halogen Free
(b) Applications: All high-density boards
(c) Product Features: Small surface mountable, Solid state, Faster time to trip than
standard SMD devices, Lower resistance than standard SMD devices
(d) Operation Current: 1.40A~3.70A
(e) Maximum Voltage: 6VDC
(f) Temperature Range : -40℃ to 85℃
2. Agency Recognition
UL: File No. E211981
C-UL: File No. E211981
TÜ V: File No. R50090556
3. Electrical Characteristics (23℃)
Part
Number
Hold
Current
Trip
Current
Rated
Voltage
Max
Current
Typical
Power
Max Time to Trip
Resistance
Current
Time
RMIN
R1MAX
IH, A
IT, A
VMAX, VDC
IMAX, A
Pd, W
A
Sec
Ohms
Ohms
FSMD140RZ
1.40
3.60
6
100
1.0
8.0
3.00
0.010
0.035
FSMD190RZ
1.90
4.90
6
100
1.0
8.0
5.00
0.003
0.025
FSMD270RZ
2.70
6.20
6
100
1.0
13.5
3.00
0.003
0.023
FSMD300RZ
3.00
7.00
6
100
1.0
15.0
2.00
0.003
0.022
FSMD370RZ
3.70
9.10
6
100
1.0
18.5
2.00
0.003
0.018
IH=Hold current-maximum current at which the device will not trip at 23℃still air.
IT=Trip current-minimum current at which the device will always trip at 23℃ still air.
V MAX=Maximum voltage device can withstand without damage at it rated current.(I MAX)
I MAX= Maximum fault current device can withstand without damage at rated voltage (V MAX).
Pd=Typical power dissipated-type amount of power dissipated by the device when in the tripped state in 23℃ still air environment.
RMIN=Minimum device resistance at 23℃ prior to tripping.
R1MAX=Maximum device resistance at 23℃ measured 1 hour post trip.
Termination pad characteristics
Termination pad materials: Pure Tin
FUZETEC TECHNOLOGY CO., LTD.
NO.
PQ04-44E
Product Specification and Approval Sheet
Version
5
Page
2/4
NOTE : Specification subject to change without notice.
4. FSMD Product Dimensions (Millimeters)
Part
Number
A
B
C
D
E
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
FSMD140RZ
4.37
4.73
3.07
3.41
0.30
0.70
0.25
0.95
0.25
0.65
FSMD190RZ
4.37
4.73
3.07
3.41
0.30
0.70
0.25
0.95
0.25
0.65
FSMD270RZ
4.37
4.73
3.07
3.41
0.40
0.75
0.25
0.95
0.25
0.65
FSMD300RZ
4.37
4.73
3.07
3.41
0.40
0.75
0.25
0.95
0.25
0.65
FSMD370RZ
4.37
4.73
3.07
3.41
0.40
0.75
0.25
0.95
0.25
0.65
5. Thermal Derating Curve
0%
50%
100%
150%
200%
-40 -20 0 20 40 60 80
Percent of Rated Hold and Trip Current
Ambient Temperature (℃)
Lo Rho FSMD1812 Series