72R040XU Littelfuse Inc, 72R040XU Datasheet - Page 2

• Manufacturer Part Number: 72R040XU
• Description: PTC RESETTABLE 72V .400A RADIAL
• Manufacturer: Littelfuse Inc
• Series: POLYFUSE® 72Rr

Specifications of 72R040XU

• R Min/max: 0.550 ~ 1.290 Ohm
• Voltage - Max: 72V
• Time To Trip: 3.8s
• Current - Hold (ih) (max): 400mA
• Current - Trip (it): 800mA
• Current - Max: 40A
• Package / Case: Radial
• Holding Current: 400mA
• Tripping Current: 800mA
• Initial Resistance Max: 1.29ohm
• Operating Voltage: 72VDC
• Ptc Fuse Case: Radial Lead
• Initial Resistance Min: 0.55ohm
• External Depth: 3.1mm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 72R040X; F3195

72R Series
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.
Temperature Rerating
Part Number
Average Time Current Curves
72R020X
72R025X
72R030X
72R040X
72R050X
72R065X
72R075X
72R090X
72R250X
72R300X
72R375X
72R135X
72R160X
72R185X
72R110X
0.01
100
0.1
10
1
0.1
-40°C
0.31
0.39
0.47
0.62
0.78
2.09
2.48
2.87
3.88
4.65
5.81
1.40
1.71
1.01
1.16
Current in Amperes
1
-20°C
0.27
0.34
0.41
0.54
0.68
0.88
2.52
3.40
4.08
1.02
1.22
1.50
1.84
2.18
5.10
POLYFUSE
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°C
72R
Radial Leaded > 72R Series
Ambient Operation Temperature
100
23°C
0.20
0.25
0.30
0.40
0.50
0.65
0.75
0.90
2.50
3.00
3.75
1.10
1.35
1.60
1.85
®
Revised: July 12, 2010
Resettable PTCs
Hold Current (A)
92
40°C
0.16
0.20
0.24
0.32
0.41
0.53
0.61
0.73
0.89
2.03
2.43
3.04
1.09
1.30
1.50
Temperature Rerating Curve
170%
150%
130%
110%
90%
70%
50%
30%
10%
-40 -30 -20
50°C
0.14
0.18
0.22
0.29
0.36
0.47
0.54
0.65
0.79
0.97
2.16
2.70
1.15
1.33
1.80
Please refer to www.littelfuse.com/series/72R.html for current information.
-10
60°C
0.13
0.16
0.19
0.25
0.32
0.41
0.47
0.57
0.69
0.85
2.36
1.01
1.17
1.58
1.89
0
10
Specifications are subject to change without notice.
Temperature (°C)
20
70°C
0.14
0.16
0.22
0.27
0.35
0.41
0.49
0.59
0.73
0.86
2.03
0.11
1.00
1.35
1.62
30
40
50
85°C
0.08
0.20
0.26
0.30
0.36
0.44
0.54
0.64
0.10
0.12
0.16
0.74
1.00
1.20
1.50
60
© 2010 Littelfuse, Inc.
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