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POLYFUSE(R) 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
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
Pd 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
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 () 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 () 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
Agency Approvals
72R020X 72R025X 72R030X 72R040X 72R050X 72R065X 72R075X 72R090X 72R110X 72R135X 72R160X 72R185X 72R250X 72R300X 72R375X
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
I hold = Hold current: maximum current device will pass without tripping in 23C still air. I trip = Trip current: minimum current at which the device will trip in 23C 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 (Vmax) P d = Power dissipated from device when in the tripped state at 23C still air. R min = Minimum resistance of device in initial (un-soldered) state.
R 1max = Maximum resistance of device at 23C measured one hour after tripping or reflow soldering of 260C for 20 sec. Caution: Operation beyond the specified rating may result in damage and possible arcing and flame.
(c)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
72R Series
Electrical Characteristics
POLYFUSE(R) Resettable PTCs
Radial Leaded > 72R Series
Temperature Rerating
Ambient Operation Temperature -40C 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 -20C 0C 23C 40C 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 50C 60C 70C 85C
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
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/72R.html for current information.
POLYFUSE(R) 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 4C/Sec. Max. solder temperature should not exceed 260C 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
-40C to +85C 125C +85C, 1000 hours -/+5% typical resistance change +85C, 85% R.H. 1000 hours -/+5% typical resistance change +85C to -40C 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
(c)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
72R Series
POLYFUSE(R) 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
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/72R.html for current information.
POLYFUSE(R) 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 U PR U PR U PR U PR U PR U MR F MR F MR F MR F MR F MR H
(c)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
72R Series
PR
POLYFUSE(R) 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.
Dimensions Dimension EIA Mark IEC Mark Dim. (mm) Tol. (mm)
Carrier tape width Hold down tape width Top distance between tape edges Sprocket hole position Sprocket hole diameter* Abscissa to plane (straight lead) Abscissa to plane (kinked lead) Abscissa to top 72R020X-72R090X Abscissa to top 72R110X-72R300X Overall width without lead protrusion: 72R020X-72R090X Overall width without lead protrusion: 72R110X-72R300X Overall width with lead protrusion: 72R020X-72R090X Overall width with lead protrusion: 72R110X-72R300X Lead protrusion Protrusion of cut out Protrusion beyond hold-down tape Sprocket hole pitch: 72R020X-72R090X Sprocket hole pitch: 72R110X-72R300X Pitch tolerance Device pitch: 72R020X-72R090X Device pitch: 72R110X-72R300X Tape thickness Tape thickness with splice Splice sprocket hole alignment Body lateral deviation Body tape plane deviation Ordinate to adjacent component lead*: 72R020X-72R090X Ordinate to adjacent component lead*: 72R110X-72R300X Lead spacing: 72R020X-72R185X Lead spacing: 72R250X-72R300X *Differs from EIA Specification
W W4 W6 W5 D0 H H0 H1 H1 C1
W W0 W2 W1 D0 H H0 H1
18 11 3 9 4 18.5 16 32.2 47 .5 42.5 57
-0.5 / +1.0 min. max. -0.5 / +0.75 -0.32 / +0.2 -/+ 3.0 -/+ 0.5 max. max. max.
C2 58 L1 L l2 P0 P0 l1 L l2 P0 P0
43.2
max.
1.0 11 Not specified 12.7 25.4 20 consecutive. 12.7 25.4
max. max.
-/+ 0.3 -/+ 0.5 -/+ 1
t t1
t
0.9 2.0 0
max. max. -/+ 0.3 -/+ 1.0 -/+ 1.3 -/+ 0.7 -/+ 0.7 -/+ 0.8 -/+ 0.8
h p P1
h p P1
0 0 3.81 7 .62
F F
F F
5.08 10.18
72R Series
144 Revised: April 3, 2009
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/72R.html for current information.
POLYFUSE(R) Resettable PTCs
Radial Leaded > 72R Series
Tape and Ammo Diagram
Figure 1
h h h Reference plane H1 L I2 L1 P0 D0
Direction of unreeling Cross section A - B
p
A1 F A B H0 W4 W5 W
H1 C1 H C2
t
(c)2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/72R.html for current information.
145 Revised: April 3, 2009
72R Series
72R Series

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