Littelfuse 72R Series - Manual (Page 3)

93
Revised: July 12, 2010
POLYFUSE ® Resettable PTCs
© 2010 Littelfuse, Inc
72R Series
Radial Leaded > 72R Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/72R.html for current information.
72R S
eries
Environmental Specifications
Operating/Storage
Temperature
-40°C to +85°C
Maximum Device Surface
Temperature in Tripped State
125°C
Passive Aging
+85°C, 1000 hours
-/+5% typical resistance change
Humidity Aging
+85°C, 85% R.H. 1000 hours
-/+5% typical resistance change
Thermal Shock
+85°C to -40°C 10 times
-/+5% typical resistance change
Solvent Resistance MIL–STD–202, Method 215F
Moistrue Sesitivity Level Level 1, J–STD–020C
Physical Specifications
Lead Material
0.20-0.40A: Tin-plated Copper clad steel
0.50-3.75A: Tin-plated Copper
Soldering
Characteristics Solderability per MIL–STD–202, Method
208E
Insulating Material
Cured, flame retardant epoxy polymer
meets UL 94V-0 requirements.
Lead Solderability
Marked with ‘LF’, voltage, current rating,
and date code.
Soldering Parameters - Wave Soldering
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)