Littelfuse USBR User Manual
USBR Series
POLYFUSE® Resettable PTCs
Radial Leaded > USBR Series
Description
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provide overcurrent protection for USB applications
where space is not a concern.
Features
Agency Approvals
AGENCY AGENCY FILE NUMBER
E183209
R50119318
Electrical Characteristics
I
Part Number
hold
(A)
06R075B 0.75 1.30 6 40 0.3 8.00 0.4 0.100 0.230 XX
06R120B 1.20 2.00 6 40 0.6 8.00 0.5 0.065 0.140 XX
06R155B 1.55 2.70 6 40 0.6 7.75 2.2 0.040 0.100 XX
16R090B 0.90 1.80 16 40 0.6 8.00 1.2 0.070 0.180 XX
16R110B 1.10 2.20 16 40 0.7 8.00 2.3 0.050 0.140 XX
16R135B 1.35 2.70 16 40 0.8 8.00 4.5 0.040 0.120 XX
16R160B 1.60 3.20 16 40 0.9 8.00 9.0 0.030 0.110 XX
16R185B 1.85 3.70 16 40 1.0 8.00 10.0 0.030 0.090 XX
16R250B 2.50 5.00 16 40 1.2 8.00 40.0 0.020 0.060 XX
I
= Hold current: maximum current device will pass without tripping in 20°C still air.
hold
= Trip current: minimum current at which the device will trip in 20°C still air.
I
trip
= Maximum voltage device can withstand without damage at rated current (I max)
V
max
= Maximum fault current device can withstand without damage at rated voltage (V
I
max
= Power dissipated from device when in the tripped state at 20°C still air.
P
d
I
(A)
V
trip
max
(Vdc)
I
(A)
max
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6-16V
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requirements
Applications
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P
max.
(W)
)
max
Maximum Time
d
R
= Minimum resistance of device in initial (un-soldered) state.
min
= Typical resistance of device in initial (un-soldered) state.
R
typ
= Maximum resistance of device at 20°C measured one hour after tripping or reflow
R
1max
Caution: Operation beyond the specified rating may result in damage and possible arcing
and flame.
To Trip
Current
(A)
soldering of 260°C for 20 sec.
Time
(Sec.)
Resistance
R
min
(Ω)
R
1max
(Ω)
Agency
Approvals
USBR Series
© 2010 Littelfuse, Inc
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/USBR.html for current information.
63
Revised: July 12, 2010
USBR Series
POLYFUSE® Resettable PTCs
Radial Leaded > USBR Series
Temperature Rerating
Ambient Operation Temperature
-40°C -20°C 0°C 23°C 40°C 50°C 60°C 70°C 85°C
Part Number Hold Current (A)
06R075B 1.05 0.95 0.85 0.75 0.65 0.60 0.55 0.50 0.43
06R120B 1.69 1.52 1.36 1.20 1.04 0.96 0.88 0.80 0.68
06R155B 2.17 1.96 1.75 1.55 1.34 1.24 1.13 1.03 0.88
16R090B 1.31 1.17 1.04 0.90 0.75 0.69 0.61 0.55 0.47
16R110B 1.60 1.43 1.27 1.10 1.00 0.92 0.75 0.67 0.57
16R135B 1.96 1.76 1.55 1.35 1.12 1.04 0.92 0.82 0.70
16R160B 2.32 2.08 1.84 1.60 1.33 1.23 1.09 0.98 0.83
16R185B 2.68 2.41 2.13 1.85 1.54 1.42 1.26 1.13 0.96
16R250B 3.63 3.25 2.88 2.50 2.08 1.93 1.70 1.53 1.30
Average Time Current Curves
0.75A
1.20A
1.55A
0.90A
1.10A
1.35A
1.60A
100
10
1
0.1
Time in Seconds
0.01
0.001
1 10 100 1000
1.85A
Current in Amperes
2.50A
USBR
Temperature Rerating Curve
170%
B
150%
A
130%
110 %
90%
70%
50%
Percentage of Rated Current
30%
10%
The average time current curves and Temperature Rerating curve performance is affected
by a number or variables, and these curves provided as guidance only. Customer must
verify the performance in their application.
Line/Part Number:
AB
16R090B
06R075B
16R110B
06R120B
16R135B
06R155B
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 85
16R160B
16R185B
16R250B
Temperature (°C)
A
B
Soldering Parameters
260
220
Preheating
0
60 min.
Temperature (°C)
USBR Series
190
160
Soldering Cooling
5 max.
Time(s)
Pre-Heating
Zone
Soldering Zone
Cooling Zone Cooling by natural convection in air.
64
Revised: July 12, 2010
Refer to the condition recommended by the
flux manufacturer. Max. ramping rate should
not exceed 4°C/Sec.
Max. solder temperature should not exceed
260°C
© 2010 Littelfuse, Inc.
Please refer to www.littelfuse.com/series/USBR.html for current information.
Specifications are subject to change without notice.
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