SMD2920P185TF PolyFuse 7351 Surface Mount Resettable Fuses PPTC
1.85A 33V 2920 For Low Voltage Telecom Equipment
Overview
The 2920 series provides surface mount resettable overcurrent
protection with holding current from 0.3A to 5.0A. This series is
suitable for applications with higher holding currant and higher
working voltage up to 60V.
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Agency Approval
Environmental Compliance
| Regulation | Standard |
| RoHS | 2011/65/EU |
| Halogen-free | IEC 61249-2-21:2003 |
Dimension (unit:mm)
| P/N | Marking
| A | B | C | D |
| Min. | Max. | Min. | Max. | Min. | Max. | Min. |
| LSMD030 | T030 | 6.73 | 7.98 | 4.80 | 5.44 | 0.75 | 1.15 | 0.30 |
| LSMD050 | T050 | 6.73 | 7.98 | 4.80 | 5.44 | 0.75 | 1.15 | 0.30 |
| LSMD075 | T075 | 6.73 | 7.98 | 4.80 | 5.44 | 0.75 | 1.15 | 0.30 |
| LSMD100 | T100 | 6.73 | 7.98 | 4.80 | 5.44 | 0.65 | 1.05 | 0.30 |
| LSMD125 | T125 | 6.73 | 7.98 | 4.80 | 5.44 | 0.65 | 1.05 | 0.30 |
| LSMD150 | T150 | 6.73 | 7.98 | 4.80 | 5.44 | 0.65 | 1.50 | 0.30 |
| LSMD185 | T185 | 6.73 | 7.98 | 4.80 | 5.44 | 0.65 | 1.50 | 0.30 |
| LSMD200 | T200 | 6.73 | 7.98 | 4.80 | 5.44 | 0.55 | 0.95 | 0.30 |
| LSMD250 | T250 | 6.73 | 7.98 | 4.80 | 5.44 | 0.55 | 0.95 | 0.30 |
| LSMD260 | T260 | 6.73 | 7.98 | 4.80 | 5.44 | 0.45 | 0.85 | 0.30 |
| LSMD300 | T300 | 6.73 | 7.98 | 4.80 | 5.44 | 0.45 | 0.85 | 0.30 |
| LSMD300D | T300 | 6.73 | 7.98 | 4.80 | 5.44 | 0.65 | 1.50 | 0.30 |
Electrical Characteristics
| P/N | | | | | Max time to trip | Power | Resistance(Ω) |
| IH, (A) | IT,(A) | Vmax,(v) | Imax,(A) | (A) | (Sec.) | Pd typ(W) | Rmin | R1max |
| LSMD030 | 0.30 | 0.60 | 60 | 10 | 1.5 | 3.0 | 1.5 | 0.600 | 4.800 |
| LSMD050 | 0.50 | 1.00 | 60 | 10 | 2.5 | 4.0 | 1.5 | 0.180 | 1.400 |
| LSMD075 | 0.75 | 1.50 | 33 | 40 | 8.0 | 0.3 | 1.5 | 0.100 | 1.000 |
| LSMD100 | 1.00 | 2.00 | 33 | 40 | 8.0 | 0.5 | 1.5 | 0.065 | 0.410 |
| LSMD125 | 1.25 | 2.50 | 33 | 40 | 8.0 | 2.0 | 1.5 | 0.050 | 0.250 |
| LSMD150 | 1.50 | 3.00 | 33 | 40 | 8.0 | 2.0 | 1.5 | 0.035 | 0.230 |
| LSMD185 | 1.85 | 3.70 | 33 | 40 | 8.0 | 2.5 | 1.5 | 0.030 | 0.150 |
| LSMD200 | 2.00 | 4.00 | 16 | 40 | 8.0 | 4.5 | 1.5 | 0.020 | 0.120 |
| LSMD250 | 2.50 | 5.00 | 16 | 40 | 8.0 | 16.0 | 1.5 | 0.020 | 0.085 |
| LSMD260 | 2.60 | 5.20 | 6 | 40 | 8.0 | 10.0 | 1.5 | 0.014 | 0.075 |
| LSMD300 | 3.00 | 6.00 | 6 | 40 | 8.0 | 20.0 | 1.5 | 0.010 | 0.055 |
| LSMD300D | 3.00 | 5.20 | 24 | 20 | 8.0 | 20.0 | 1.5 | 0.010 | 0.055 |
Note on Electrical Characteristics
Vocabulary
Ihold = Hold current: maximum current device will pass without
tripping in 23ºC still air.
Itrip = Trip current: minimum current at which the device will trip
in 23 ºC still air.
Vmax = Maximum voltage device can withstand without damage at rated
current (I max)
Imax = Maximum fault current device can withstand without damage at
rated voltage (Vmax)
Pd typ = Typical power dissipated from device when in the tripped
state at 23 ºC still air.
Rmin = Minimum resistance of device in initial (un-soldered) state.
R1max = Maximum resistance of device at 23 ºC measured one hour
after tripping or reflow soldering of 260 ºC for 20 sec. Value
specified is determined by using the PWB with 0.150”*1.5oz copper
traces.
Caution: Operation beyond the specified rating may result in damage
and possible arcing and flame. Specifications are subject to change
without notice. Po
Features
RoHS compliant and lead-free
Halogen-free
High voltage
Low profile
Fast response to fault current
Compatible with high temperature solders
Application
Power over Ethernet (POE)
Powered USB for POS and IPC
Automotive electronics control module protection
IEEE 1394 port protection
Low voltage telecom equipment
Industrial control
Security systems
Polymeric PTC Selecting Guide
a.Determine the following operating parameters for the circuits:
*Normal operating current (Ihold) *Maximum interrupt current (Imax)
*Maximum circuit voltage (Vmax) *Normal operating temperature
surrounding device (minºC/maxºC)
b.Select the device form factor and dimension suitable for the
application:
*Surface Mount Device (SMD) *Axial Leaded Device (ALD) *Other
Customized Form Factors
*Radial Leaded Device (RLD) *DISC Device
c.Compare the maximum rating for Vmax and Imax of the PPTC device
with the circuit in application and make sure the circuit’s
requirement does not exceed the device rating.
d.Check that PPTC device’s trip time (time-to-trip) will protect
the circuit.
e.Verify that the circuit operating temperature is within the PPTC
device’s normal operating temperature range.
f.Verify the performance and suitability of the chosen PPTC device
in the application.
Thermal Derating Chart – I hold (Amps)
| P/N | Ambient Operating Temperature |
| -40℃ | -20℃ | 0℃ | 25℃ | 40℃ | 50℃ | 60℃ | 70℃ | 85℃ |
| LSMD030 | 0.45 | 0.40 | 0.35 | 0.30 | 0.25 | 0.23 | 0.20 | 0.17 | 0.14 |
| LSMD050 | 0.76 | 0.67 | 0.59 | 0.50 | 0.42 | 0.38 | 0.33 | 0.29 | 0.23 |
| LSMD075 | 1.13 | 1.01 | 0.88 | 0.75 | 0.62 | 0.56 | 0.50 | 0.44 | 0.34 |
| LSMD100 | 1.66 | 1.47 | 1.29 | 1.10 | 0.91 | 0.83 | 0.73 | 0.64 | 0.50 |
| LSMD125 | 1.89 | 1.68 | 1.46 | 1.25 | 1.04 | 0.94 | 0.83 | 0.73 | 0.56 |
| LSMD150 | 2.27 | 2.01 | 1.76 | 1.50 | 1.25 | 1.13 | 1.00 | 0.87 | 0.74 |
| LSMD185 | 2.80 | 2.47 | 2.17 | 1.85 | 1.54 | 1.39 | 1.22 | 1.07 | 0.85 |
| LSMD200 | 3.02 | 2.68 | 2.34 | 2.00 | 1.66 | 1.50 | 1.32 | 1.16 | 0.90 |
| LSMD250 | 3.78 | 3.35 | 2.93 | 2.50 | 2.08 | 1.88 | 1.65 | 1.45 | 1.13 |
| LSMD260 | 3.64 | 3.25 | 2.91 | 2.60 | 2.26 | 2.08 | 1.95 | 1.74 | 1.13 |
| LSMD300 | 4.53 | 4.02 | 3.51 | 3.00 | 2.52 | 2.26 | 1.99 | 1.75 | 1.34 |
| LSMD300D | 4.53 | 4.02 | 3.51 | 3.00 | 2.52 | 2.26 | 1.99 | 1.75 | 1.34 |
Typical time to trip at 25℃
The Time to Trip curves represent typical performance of a device
in a simulated application environment. Actual performance in
specific customer applications may differ from these values due to
the influence of other variables.
A=LSMD030
B=LSMD050
C=LSMD075
D=LSMD100
E=LSMD125
F=LSMD150
G=LSMD185
H=LSMD200
I=LSMD250
J=LSMD260
K=LSMD300
Package
Model Q’ty/Reel
LSMD150/185/300D 1000 pcs
LSMD030 ~ LSMD125 1500 pcs
LSMD200 ~ LSMD300 2000 pcs
Note: Reel packaging per EIA-481-1 standard
