Littelfuse USBR Series - Manual (Page 2)

64
Revised: July 12, 2010
POLYFUSE ® Resettable PTCs
© 2010 Littelfuse, Inc.
USBR Series
Radial Leaded > USBR Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/USBR.html for current information.
Temperature Rerating Curve
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 85
10%
30%
50%
70%
90%
110%
130%
150%
170%
Temperature (°C)
Percentage of Rated Current
B
A
A
B
06R075B
06R120B
06R155B 16R090B
16R110B
16R135B
A B
Line/Part Number:
16R160B
16R185B
16R250B
Average Time Current Curves
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.
Soldering Parameters
Pre-Heating
Zone
Refer to the condition recommended by the
flux manufacturer. Max. ramping rate should
not exceed 4°C/Sec.
Soldering Zone
Max. solder temperature should not exceed
260°C
Cooling Zone Cooling by natural convection in air.
Preheating
160
190
220
260
0
5 max.
Temperature (
°C)
Soldering Cooling
60 min.
Time(s)
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
Temperature Rerating
100
1
10
0.1
0.001
0.01
0.75A 1.20A 1.55A 0.90A 1.10A 1.35A 1.60A 1.85A 2.50A
1 10 100 1000
Current in Amperes
Time in Seconds
USBR