®
POLY-FUSE Resettable PTCs
Radial Leaded > USBR Series
Soldering Parameters
Refer to the condition recommended by
the flux manufacturer.
Soldering
Cooling
Pre-Heating Zone
260
220
Max. ramping rate should not exceed 4°C/
Sec.
Max. solder temperature should not
exceed 260°C
Preheating
190
160
Time within 5°C of actual Max. solder
temperature within 3 – 5 seconds
Soldering Zone
Cooling Zone
Total time from 25°C room to Max. solder
temperature within 5 minutes including
Pre-Heating time
0
5 max.
60 min.
Time(s)
Cooling by natural convection in air.
Max. ramping down rate should not
exceed 6°C/Sec.
Physical Specifications
.90-2.50A:Tin-plated Copper clad steel
.75A:Tin-plated Copper
Lead Material
Environmental Specifications
Operating/Storage
Soldering
Characteristics
Solderability per MIL–STD–202,
Method 208
-40°C to +85°C
Temperature
Cured, flame retardant epoxy polymer
meets UL 94V-0 requirements.
Insulating Material
Device Labeling
Maximum Device Surface
Temperature inTripped State
125°C
Marked with ‘LF’, voltage, current rating,
and date code.
+85°C, 1000 hours
-/+5% typical resistance change
Passive Aging
Humidity Aging
Thermal Shock
+85°C, 85% R.H., 1000 hours
-/+5% typical resistance change
Dimensions (mm)
+85°C to -40°C 10 times
-/+5% typical resistance change
A
E
A
E
Solvent Resistance
MIL–STD–202, Method 215
Level 1, J–STD–020
B
D
B
D
Moisture Sensivitivy Level
C
C
Figure 1
Figure 2
A
B
C
D
E
Physical Characteristics
Part
Number
Figure Inches mm Inches mm Inches mm Inches mm Inches mm
Lead (dia)
Material
Max.
0.27
0.27
0.27
0.29
0.29
0.35
0.35
0.40
0.45
Max.
6.9
6.9
6.9
7. 4
Max.
0.45
0.46
0.46
0.48
0.56
0.53
0.60
0.62
0.72
Max.
11.4
Typ.
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
Typ.
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
Min.
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
Min.
7. 6
7. 6
7. 6
7. 6
7. 6
7. 6
7. 6
7. 6
7. 6
Max.
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
Max. Inches mm
06R075B
06R120B
06R155B
16R090B
16R110B
16R135B
16R160B
16R185B
16R250B
1
1
1
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.020
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
Sn/Cu
11.7
Sn/CuFe
Sn/CuFe
Sn/CuFe
Sn/CuFe
Sn/CuFe
Sn/CuFe
Sn/CuFe
Sn/CuFe
11.7
12.2
14.2
13.5
15.2
15.7
18.3
7. 4
8.9
8.9
10.2
11.4
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17