POLY-FUSE® Resettable PTCs
Radial Leaded > 72R Series
72R Series
RoHS
Description
The 72R Series is designed to provide overcurrent
protection to 72Vdc maximum voltage with a maximum
40A short circuit rating.
Features
• 72Vdc max voltage w/max • Resettable feature
40A short circuit rating
• Ideal for a broad range of
• RoHS-compliant, Lead-Free general electronics using a
and Halogen Free*
low voltage power supply
Applications
• Load protection on wide
• Computer peripherals
range of low voltage power • General electronics
supplies
Agency Approvals
Agency
Agency File Number
• Computers
E183209
R50119318
Additional Information
Datasheet
Samples
Resources
Electrical Characteristics
Part Number
I hold
(A)
I trip
(A)
V max
(Vdc)
I max
(A)
Pd
typ.
(W)
Maximum Time To Trip
Current
Time
(A)
(Sec.)
Resistance
R min
R 1max
(Ω)
(Ω)
Agency Approvals
72R020X
0.20
0.40
72
40
0.41
1.00
2.20
1.830
4.400
X
X
72R030X
0.30
0.60
72
40
0.49
1.50
3.00
0.880
2.100
X
X
72R040X
0.40
0.80
72
40
0.56
2.00
3.80
0.550
1.290
X
X
72R050X
0.50
1.00
72
40
0.77
2.50
4.00
0.500
1.170
X
X
72R065X
0.65
1.30
72
40
0.88
3.25
5.30
0.310
0.720
X
X
72R075X
0.75
1.50
72
40
0.92
3.75
6.30
0.250
0.600
X
X
72R090X
0.90
1.80
72
40
0.99
4.50
7.20
0.200
0.470
X
X
72R110X
1.10
2.20
72
40
1.50
5.50
8.20
0.150
0.380
X
X
72R135X
1.35
2.70
72
40
1.70
6.75
9.60
0.120
0.300
X
X
72R160X
1.60
3.20
72
40
1.90
8.00
11.40
0.090
0.220
X
X
72R185X
1.85
3.70
72
40
2.10
9.25
12.60
0.080
0.190
X
X
72R250X
2.50
5.00
72
40
2.50
12.50
15.60
0.050
0.130
X
X
72R375X
3.75
7.50
72
40
3.20
18.75
24.00
0.030
0.080
X
X
CAUTION: Operation beyond the specified rating may result in damage and possible arcing and flame.
I hold = Hold current: maximum current device will pass without tripping in 20°C still air.
I trip = Trip current: minimum current at which the device will trip in 20°C still air.
Vint = Maximum voltage the device can withstand without damage at rated current (I max)
Vop = The device regular operation voltage
I max = Maximum fault current device can withstand without damage at rated voltage (Vmax)
P d = Power dissipated from device when in the tripped state at 20°C still air.
R min = Minimum resistance of device in initial (un-soldered) state.
R typ = Typical resistance of device in initial (un-soldered) state.
R 1max = Maximum resistance of device at 20°C measured one hour after tripping.
* Effective February 11, 2010 onward, all 600R PTC products will be manufactured Halogen Free (HF). Existing
Non-Halogen Free 600R PTC products may continue to be sold, until supplies are depleted. This change will
have no effect on 600R product specifications or performance.
WARNING
• Users shall independently assess the suitability of these devices for each of their applications
• Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or fire
• These devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such conditions are expected to be
repetitive or prolonged in duration
• Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these PPTC devices
• These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses
• Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BO.12/07/20
POLY-FUSE® Resettable PTCs
Radial Leaded > 72R Series
Temperature Rerating
Ambient Operation Temperature
-40°C
-20°C
0°C
20°C
Part Number
40°C
50°C
60°C
70°C
85°C
0.08
Hold Current (A)
72R020X
0.31
0.27
0.24
0.20
0.16
0.14
0.13
0.11
72R030X
0.47
0.41
0.36
0.30
0.24
0.22
0.19
0.16
0.12
72R040X
0.62
0.54
0.48
0.40
0.32
0.29
0.25
0.22
0.16
72R050X
0.78
0.68
0.60
0.50
0.41
0.36
0.32
0.27
0.20
72R065X
1.01
0.88
0.77
0.65
0.53
0.47
0.41
0.35
0.26
72R075X
1.16
1.02
0.89
0.75
0.61
0.54
0.47
0.41
0.30
72R090X
1.40
1.22
1.07
0.90
0.73
0.65
0.57
0.49
0.36
72R110X
1.71
1.50
1.31
1.10
0.89
0.79
0.69
0.59
0.44
72R135X
2.09
1.84
1.61
1.35
1.09
0.97
0.85
0.73
0.54
0.64
72R160X
2.48
2.18
1.90
1.60
1.30
1.15
1.01
0.86
72R185X
2.87
2.52
2.20
1.85
1.50
1.33
1.17
1.00
0.74
72R250X
3.88
3.40
2.98
2.50
2.03
1.80
1.58
1.35
1.00
72R375X
5.81
5.10
4.46
3.75
3.04
2.70
2.36
2.03
1.50
170%
72R
130%
90%
1000
70%
50%
30%
1
10000
110%
10%
Time in Seconds
Time in Seconds
10
250R
100000
150%
Percentage of Rated Current
3.75A
0.30A
0.40A
0.50A
0.65A
0.75A
0.90A
1.10A
1.35A
1.60A
1.85A
2.50A
0.20A
100
0.080A
0.120A
0.145A
0.180A
Temperature Rerating Curve
Average Time Current Curves
-40 -30 -20
100
10
-10
0
10
20 30
40
Temperature (°C)
50
60
70
80
1
0.1
Note: Typical Temperature rerating curve, refer to table for derating data
0.1
0.01
0.01
0.1
1
10
100
Current in Amperes
0.1
1
10
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.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BO.12/07/20
100
POLY-FUSE® 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.
Soldering Zone
Max. solder temperature should not exceed 260°C.
Time within 5°C of actual Max. solder temperature
within 3 - 5 seconds.
Total time from 25°C room to Max. solder temperature
within 5 minutes including Pre-Heating time.
Cooling Zone
Cooling by natural convection in air.
Max. ramping down rate should not exceed 6°C/Sec.
Soldering
260
Cooling
220
Temperature (°C)
Pre-Heating Zone
190
160
Preheating
0
60 min.
5 max.
Time(s)
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 208
Insulating Material
Lead Solderability
Cured, flame retardant epoxy polymer meets UL 94V0 requirements.
Marked with ‘LF’, voltage, current rating,
and date code.
Environmental Specifications
Operating/Storage Temperature
Maximum Device Surface
Temperature in Tripped State
-40°C to +85°C
125°C
Solvent Resistance
+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 215
Moistrue Sesitivity Level
Level 1, J–STD–020
Passive Aging
Humidity Aging
Thermal Shock
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BO.12/07/20
POLY-FUSE® Resettable PTCs
Radial Leaded > 72R Series
Dimensions
Part Marking System
E
A
Single Sided Marking
Littelfuse
Trademark
Voltage Rating
Current Rating
72
020X
XXXX
Littelfuse
Trademark
Date Code
(Contact Littelfuse
for additional
information)
B
D
F
C
Part
Number
72R020X
72R030X
72R040X
72R050X
72R065X
72R075X
72R090X
72R110X
72R135X
72R160X
72R185X
72R250X
72R375X
A
B
C
D
E
F
Physical Characteristics
Inches
mm
Inches
mm
Inches
mm
Inches
mm
Inches
mm
Inches
mm
Max.
0.29
0.29
0.30
0.31
0.37
0.40
0.44
0.51
0.53
0.60
0.66
0.78
1.04
Max.
7.4
7.4
7.6
7.9
9.4
10.2
11.2
13.0
13.58
15.36
16.76
19.93
26.3
Max.
0.46
0.50
0.53
0.54
0.57
0.60
0.62
0.72
0.78
0.85
0.91
1.03
1.22
Max.
11.7
12.7
13.5
13.7
14.5
15.2
15.8
18.2
19.8
21.6
23.0
26.2
31.1
Typ.
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
Typ.
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
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
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
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
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
Typ.
0.047
0.047
0.047
0.047
0.047
0.047
0.047
0.055
0.055
0.055
0.055
0.055
0.055
Typ.
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.4
1.4
1.4
1.4
1.4
1.4
Lead (dia)
Inches
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
mm
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
Material
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
Part Ordering Number System
72 R 090 X P R
Packaging Style
Blank: Bulk
R: Tape & Ammo
Series
Quantity Code: F=200 H=100 M=1000 P=2000 U=500
Type: X (72VDC)
IHOLD Current Code (Refer to Packaging or Electrical Characteristics tables)
R: Radial
Voltage Rating (Vdc)
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BO.12/07/20
Littelfuse
Trademark
POLY-FUSE® Resettable PTCs
Radial Leaded > 72R Series
Packaging
Ordering Part
Number
72R020XPR
72R030XPR
72R040XPR
72R050XPR
72R065XPR
72R075XPR
72R090XPR
72R110XU
72R110XMR
72R135XF
72R135XMR
72R160XF
72R160XMR
72R185XMR
72R250XF
72R250XMR
72R375XH
Part Number
72R020X
72R030X
72R040X
72R050X
72R065X
72R075X
72R090X
72R110X
72R135X
72R160X
72R185X
72R250X
72R375X
I hold
(A)
0.20
0.30
0.40
0.50
0.65
0.75
0.90
I hold Code
Packaging Option
Quantity
Quantity & Packaging Codes
020
030
040
050
065
075
090
Tape and Ammo
Tape and Ammo
Tape and Ammo
Tape and Ammo
Tape and Ammo
Tape and Ammo
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Tape and Ammo
Bulk
Tape and Ammo
Bulk
2000
2000
2000
2000
2000
2000
2000
500
1000
200
1000
200
1000
1000
200
1000
100
PR
PR
PR
PR
PR
PR
PR
U
MR
F
MR
F
MR
MR
F
MR
H
1.10
110
1.35
135
1.60
160
1.85
185
2.50
250
3.75
375
Tape and Ammo Diagram
Figure 1
∆h
∆h
∆h
∆p
Reference plane
A1
H1
H1 C1
H C2
F
A
L
B
H0
W4
W5
W
I2
L1
P0
D0
Direction of unreeling
Cross section A - B
t
WARNING
• Users shall independently assess the suitability of these devices for each of their applications
• Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or fire
• These devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such conditions are expected to be repetitive or
prolonged in duration
• Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these PPTC devices
• These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses
Reel
• Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device.
Upper side
Direction
of
unreeling
Tape
Lower side
w1
w2
Cross section
Optional shape: Circular or polygonal
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BO.12/07/20
POLY-FUSE® Resettable PTCs
Radial Leaded > 72R Series
Tape and Ammo Specifications
Devices taped using EIA468-B/IE286-2 standards. See table below and Figure 1 for details.
Dimension
Carrier tape width
EIA Mark
IEC Mark
W
Dimensions
Dim. (mm)
Tol. (mm)
W
18
–0.5 / +1.0
Hold down tape width
W4
W0
11
min.
Top distance between tape edges
W6
W2
3
max.
Sprocket hole position
W5
W1
9
–0.5 / +0.75
Sprocket hole diameter*
D0
D0
4
–0.32 / +0.2
Abscissa to plane (straight lead)
H
H
18.5
–/+ 3.0
Abscissa to plane (kinked lead)
H0
H0
16
–/+ 0.5
Abscissa to top 72R020X–72R090X
H1
H1
32.2
max.
Abscissa to top 72R110X–72R250X
H1
-
47.5
max.
Overall width without lead protrusion: 72R020X–72R090X
C1
-
42.5
max.
Overall width without lead protrusion: 72R110X– 72R250X
-
-
57
max.
Overall width with lead protrusion: 72R020X–72R090X
C2
-
43.2
Overall width with lead protrusion: 72R110X–72R250X
-
58
-
-
Lead protrusion
L1
l1
1.0
max.
Protrusion of cut out
L
L
11
max.
Protrusion beyond hold–down tape
l2
l2
Not specified
-
Sprocket hole pitch: 72R020X–72R090X
P0
P0
12.7
–/+ 0.3
Sprocket hole pitch: 72R110X–72R250X
P0
P0
25.4
–/+ 0.5
Pitch tolerance
-
-
20 consecutive.
–/+ 1
Device pitch: 72R020X–72R090X
-
-
12.7
-
Device pitch: 72R110X–72R250X
-
-
25.4
-
Tape thickness
t
t
0.9
max.
Tape thickness with splice
t1
-
2.0
max.
Splice sprocket hole alignment
-
-
0
–/+ 0.3
Body lateral deviation
Δh
Δh
0
–/+ 1.0
Body tape plane deviation
Δp
Δp
0
–/+ 1.3
Ordinate to adjacent component lead*: 72R020X–72R090X
P1
P1
3.81
–/+ 0.7
Ordinate to adjacent component lead*: 72R110X–72R250X
-
-
7.62
–/+ 0.7
Lead spacing: 72R020X–72R185X
F
F
5.08
–/+ 0.8
Lead spacing: 72R250X–72R250X
F
F
10.18
–/+ 0.8
*Differs from EIA Specification
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are
not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BO.12/07/20
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