POLYFUSE
®
Resettable PTCs
Radial Leaded > 72R Series
72R Series
Description
The 72R Series is designed to provide overcurrent
protection to 72Vdc maximum voltage with a maximum
40A short circuit rating.
Features
lead-free
40A short circuit rating
Agency Approvals
AGENCY
AGENCY FILE NUMBER
general electronics using a
low voltage power supply
Applications
E183209
R50119318
range of low voltage power
supplies
Electrical Characteristics
Maximum Time
To Trip
Current
(A)
1.00
1.25
1.50
2.00
2.50
3.25
3.75
4.50
5.50
6.75
8.00
9.25
12.50
15.00
18.75
Time
(Sec.)
2.20
2.50
3.00
3.80
4.00
5.30
6.30
7
.20
8.20
9.60
11.40
12.60
15.60
19.80
24.00
Resistance
R
min
(Ω)
1.830
1.250
0.880
0.550
0.500
0.310
0.250
0.200
0.150
0.120
0.090
0.080
0.050
0.040
0.030
R
1max
(Ω)
4.400
3.000
2.100
1.290
1.170
0.720
0.600
0.470
0.380
0.300
0.220
0.190
0.130
0.100
0.080
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Part Number
I
hold
(A)
0.20
0.25
0.30
0.40
0.50
0.65
0.75
0.90
1.10
1.35
1.60
1.85
2.50
3.00
3.75
I
trip
(A)
0.40
0.50
0.60
0.80
1.00
1.30
1.50
1.80
2.20
2.70
3.20
3.70
5.00
6.00
7
.50
V
max
(Vdc)
72
72
72
72
72
72
72
72
72
72
72
72
72
72
72
I
max
(A)
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
P
d
typ.
(W)
0.41
0.45
0.49
0.56
0.77
0.88
0.92
0.99
1.50
1.70
1.90
2.10
2.50
2.80
3.20
Agency
Approvals
72R020X
72R025X
72R030X
72R040X
72R050X
72R065X
72R075X
72R090X
72R110X
72R135X
72R160X
72R185X
72R250X
72R300X
72R375X
I
hold
= Hold current: maximum current device will pass without tripping in 23°C still air.
I
trip
= Trip current: minimum current at which the device will trip in 23°C still air.
V
max
= Maximum voltage device can withstand without damage at rated current (I max)
I
max
= Maximum fault current device can withstand without damage at rated voltage (V
max
)
P
d
= Power dissipated from device when in the tripped state at 23°C still air.
R
min
= Minimum resistance of device in initial (un-soldered) state.
R
1max
= Maximum resistance of device at 23°C measured one hour after tripping or reflow
soldering of 260°C for 20 sec.
Caution:
Operation beyond the specified rating may result in damage and possible arcing
and flame.
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/72R.html for current information.
139
Revised: April 3, 2009
72R Series
POLYFUSE
®
Resettable PTCs
Radial Leaded > 72R Series
Temperature Rerating
Ambient Operation Temperature
-40°C
Part Number
72R020X
72R025X
72R030X
72R040X
72R050X
72R065X
72R075X
72R090X
72R110X
72R135X
72R160X
72R185X
72R250X
72R300X
72R375X
0.31
0.39
0.47
0.62
0.78
1.01
1.16
1.40
1.71
2.09
2.48
2.87
3.88
4.65
5.81
0.27
0.34
0.41
0.54
0.68
0.88
1.02
1.22
1.50
1.84
2.18
2.52
3.40
4.08
5.10
0.24
0.30
0.36
0.48
0.60
0.77
0.89
1.07
1.31
1.61
1.90
2.20
2.98
3.57
4.46
0.20
0.25
0.30
0.40
0.50
0.65
0.75
0.90
1.10
1.35
1.60
1.85
2.50
3.00
3.75
-20°C
0°C
23°C
40°C
Hold Current (A)
0.16
0.20
0.24
0.32
0.41
0.53
0.61
0.73
0.89
1.09
1.30
1.50
2.03
2.43
3.04
0.14
0.18
0.22
0.29
0.36
0.47
0.54
0.65
0.79
0.97
1.15
1.33
1.80
2.16
2.70
0.13
0.16
0.19
0.25
0.32
0.41
0.47
0.57
0.69
0.85
1.01
1.17
1.58
1.89
2.36
0.11
0.14
0.16
0.22
0.27
0.35
0.41
0.49
0.59
0.73
0.86
1.00
1.35
1.62
2.03
0.08
0.10
0.12
0.16
0.20
0.26
0.30
0.36
0.44
0.54
0.64
0.74
1.00
1.20
1.50
50°C
60°C
70°C
85°C
Average Time Current Curves
Temperature Rerating Curve
0.20A
0.25A
0.30A
0.40A
0.50A
0.65A
0.75A
0.90A
1.10A
1.35A
1.60A
1.85A
2.50A
3.00A
3.75A
170%
100
72R
Percentage of Rated Current
150%
130%
110%
90%
70%
50%
30%
10
Time in Seconds
1
10%
-40 -30 -20
-10
0
10
20 30
40
Temperature (°C)
50
60
70
80
0.1
0.01
0.1
1
10
100
Current in Amperes
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.
72R Series
140
Revised: April 3, 2009
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/72R.html for current information.
POLYFUSE
®
Resettable PTCs
Radial Leaded > 72R Series
Soldering Parameters - Wave Soldering
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
Cooling by natural convection in air.
Temperature (°C)
260
220
Soldering
Cooling
Pre-Heating Zone
Soldering Zone
Preheating
190
160
Cooling Zone
0
60 min.
5 max.
Time(s)
Physical Specifications
0.20-0.40A: Tin-plated Copper clad steel
0.50-3.75A: Tin-plated Copper
Solderability per MIL–STD–202, Method
208E
Cured, flame retardant epoxy polymer
meets UL 94V-0 requirements.
Marked with ‘LF’, voltage, current rating,
and date code.
Environmental Specifications
Operating/Storage
Temperature
Maximum Device Surface
Temperature in Tripped State
Passive Aging
Lead Material
Soldering
Characteristics
Insulating Material
Lead Solderability
-40°C to +85°C
125°C
+85°C, 1000 hours
-/+5% typical resistance change
+85°C, 85% R.H. 1000 hours
-/+5% typical resistance change
+85°C to -40°C 10 times
-/+5% typical resistance change
MIL–STD–202, Method 215F
Level 1, J–STD–020C
Humidity Aging
Thermal Shock
Solvent Resistance
Moistrue Sesitivity Level
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/72R.html for current information.
141
Revised: April 3, 2009
72R Series
POLYFUSE
®
Resettable PTCs
Radial Leaded > 72R Series
Dimensions
Part Marking System
A
E
Littelfuse
Trademark
Single Sided Marking
72
020X
XXXX
Voltage Rating
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
B
D
C
A
Part Number
Inches
Max.
72R020X
72R025X
72R030X
72R040X
72R050X
72R065X
72R075X
72R090X
72R110X
72R135X
72R160X
72R185X
72R250X
72R300X
72R375X
0.29
0.29
0.29
0.30
0.31
0.37
0.40
0.44
0.51
0.53
0.60
0.66
0.78
0.91
1.04
mm
Max.
7
.4
7
.4
7
.4
7
.6
7
.9
9.4
10.2
11.2
13.0
13.58
15.36
16.76
19.93
23.11
26.3
Inches
Max.
0.46
0.50
0.50
0.53
0.54
0.57
0.60
0.62
0.72
0.78
0.85
0.91
1.03
1.15
1.22
B
mm
Max.
11.7
12.7
12.7
13.5
13.7
14.5
15.2
15.8
18.2
19.8
21.6
23.0
26.2
29.3
31.1
Inches
Typ.
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.40
0.40
0.40
C
mm
Typ.
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
10.2
10.2
10.2
Inches
Min.
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
D
mm
Min.
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
7
.6
Inches
Max.
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
E
mm
Max.
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
Physical Characteristics
Lead (dia)
Inches
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.03
0.03
0.03
0.03
0.03
0.03
0.03
mm
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.81
0.81
0.81
0.81
0.81
0.81
0.81
Material
Sn/CuFe
Sn/CuFe
Sn/CuFe
Sn/CuFe
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
72R Series
142
Revised: April 3, 2009
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/72R.html for current information.
POLYFUSE
®
Resettable PTCs
Radial Leaded > 72R Series
Part Ordering Number System
72 R 090
X PR
PACKAGING STYLE
BLANK:
Bulk
R:
Tape
& Ammo
SERIES
QUANTITY CODE:
F=200 H=100 M=1000 P=2000 U=500
TYPE: X (72VDC)
I
HOLD
CURRENT CODE
(See to Electrical Characteristics table)
R: RADIAL
VOLTAGE RATING (VDC)
Packaging
Part Number
72R020X
72R025X
72R030X
72R040X
72R050X
72R065X
72R075X
72R090X
72R110X
72R135X
72R160X
72R185X
72R250X
72R300X
72R375X
Ordering Part
Number
72R020XU
72R020XPR
72R025XU
72R025XPR
72R030XU
72R030XPR
72R040XU
72R040XPR
72R050XU
72R050XPR
72R065XU
72R065XPR
72R075XU
72R075XPR
72R090XU
72R090XPR
72R110XU
72R110XMR
72R135XF
72R135XMR
72R160XF
72R160XMR
72R185XF
72R185XMR
72R250XF
72R250XMR
72R300XF
72R300XMR
72R375XH
I
hold
(A)
0.20
0.25
0.30
0.40
0.50
0.65
0.75
0.90
1.10
1.35
1.60
1.85
2.50
3.00
3.75
I
hold
Code
020
025
030
040
050
065
075
090
110
135
160
185
250
300
375
Packaging
Option
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Quantity
500
2000
500
2000
500
2000
500
2000
500
2000
500
2000
500
2000
500
2000
500
1000
200
1000
200
1000
200
1000
200
1000
200
1000
100
Quantity &
Packaging Codes
U
PR
U
PR
U
PR
U
PR
U
PR
U
PR
U
PR
U
PR
U
MR
F
MR
F
MR
F
MR
F
MR
F
MR
H
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/72R.html for current information.
143
Revised: April 3, 2009
72R Series
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