Revised: January 7, 2009
139
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
370 Series
Please refer to www.littelfuse.com/series/370.html for current information.
Radial Lead
TR5® > Fast-Acting > 370 Series
370 Series
370 Series, TR5®, Fast-Acting Fuse
Agency Approvals
Agency Agency File Number Ampere Range
License number:
5007679-1170-0001/82438 100mA - 5A
License number:
5007679-1170-0001/97059
5007679-1170-0009/97069
5007679-1170-0002/82443
40mA
50mA - 80mA
6.3A
Certificate number:
710055 50mA - 6.3A
File number:
E67006 40mA - 6.3A
JET0381-31007-2003 1A - 5A
2007010207240347 50mA - 5A
Features
Electrical Characteristics
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requirements
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plug-in versions
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to 6.3A
% of Ampere
Rating Opening Time
150% 1 Hour, Min.
210% 30 Minutes, Max.
275% 10 ms, Min. ; 3 Sec., Max.
400% 3 ms, Min. ; 300 ms, Max.
1000% 20 ms, Max.
Applications
The 370 Series are TR5®,sub-miniature,fast-acting type,
250V rated fuses, designed in accordance to IEC 60127-
3.
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Description
Revised: January 7, 2009
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
140 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
370 Series
Please refer to www.littelfuse.com/series/370.html for current information.
Radial Lead
TR5® > Fast-Acting > 370 Series
Average Time Current CurvesTemperature Rerating Curve
Electrical Characteristics
Amp
Code
Rated
Current
Voltage
Rating Breaking Capacity
Voltage
Drop
1.0 x IN
max. (mV)
Power
Dissipation
1.5 x IN
max. (mW)
Melting
Integral
10 x IN
max. (A2s)
Agency Approvals
0040 40mA 250V
35 A/ 250VAC1
50-60 Hz cos ϕ = 1.0
900 100 0.0002 GX
0050 50mA 250V 320 80 0.00035 XX X X
0063 63mA 250V 350 100 0.0005 XX X X
0080 80mA 250V 370 120 0.0014 XX X X
0100 100mA 250V 600 130 0.0038 XX X X
0125 125mA 250V 550 172 0.0066 XX X X
0160 160mA 250V 500 165 0.014 XX X X
0200 200mA 250V 465 190 0.03 XX X X
0250 250mA 250V 400 250 0.051 XX X X
0315 315mA 250V 380 250 0.1 XX X X
0400 400mA 250V 120 135 0.025 XX X X
0500 500mA 250V 120 155 0.042 XX X X
0630 630mA 250V 115 200 0.076 XX X X
0800 800mA 250V 120 310 0.12 XX X X
1100 1.00A 250V 110 310 0.2 XX X XX
1125 1.25A 250V 100 360 0.31 XX X XX
1160 1.60A 250V 100 600 0.53 XX X XX
1200 2.00A 250V 85 500 0.98 XX X XX
1250 2.50A 250V 80 660 1.8 XX X XX
1315 3.15A 250V 90 950 3.1 XX X XX
1400 4.00A 250V 40 A / 250 VAC 80 920 6.7 XX X XX
1500 5.00A 250V 50 A / 250 VAC 80 1000 12.00 XX X XX
1630 6.30A* 250V 70 1200 24.00 GX X
1 Per UL, approved breaking capacity is 50 A at 250 V.
* Conducting path min. 0.2 mm2
G = Expert Report pending
Note: 1.00 means the number one with two decimal places. 1,000 means the number one thousand.
CURRENT IN AMPERES
TIME IN SECONDS
0.001
0.010
0.100
1
10
100
1000
10000
100000
0.100 1 10 1000.02
0.040
A
0.050
A
0.063
A
0.080
A
0.100
A
0.125
A
0.160
A
0.200
A
0.250
A
0.315
A
0.400
A
0.500
A
0.630
A
0.800
A
1.00A
1.25A
1.60A
2.00A
2.50A
3.15A
4.00A
5.00A
6.30A
CURRENT IN AMPERES
TIME IN SECONDS
0.001
0.010
0.100
1
10
100
1000
10000
100000
0.100 1 10 1000.02
0.040
A
0.050
A
0.063
A
0.080
A
0.100
A
0.125
A
0.160
A
0.200
A
0.250
A
0.315
A
0.400
A
0.500
A
0.630
A
0.800
A
1.00A
1.25A
1.60A
2.00A
2.50A
3.15A
4.00A
5.00A
6.30A
0
20
40
60
80
100
120
140
-40-200 20406080
AMBIENT TEMPERATURE (°C)
PERCENT OF RATING
23°C
Revised: January 7, 2009
141
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
370 Series
Please refer to www.littelfuse.com/series/370.html for current information.
Radial Lead
TR5® > Fast-Acting > 370 Series
370 Series
Materials
Base/Cap: Brown Thermoplastic
Polyamide PA 6.6, UL 94 V-0
Round Pins: Copper, Tin-plated
Lead Pull Strength 10 N (EN 60068-2-21)
Solderability 260ºC, ≤ 3s. (Wave)
350ºC, ≤ 1s. (Soldering Iron)
Soldering Heat
Resistance
260ºC, 10s. (IEC 60068-2-20)
350ºC, 3s. (Soldering Iron)
Product Characteristics
Operating Temperature -40ºC to +85ºC (consider de-rating)
Climatic Category -40ºC to +85ºC/21 days
(IEC 60068-1,-2-1,-2-2,-2-78)
Stock Conditions
+10ºC to +60ºC
RH ≤ 75% yearly average, without
dew, maximum value for 30 days-
95%
Vibration Resistance
24 cycles at 15 min. each
(EN 60068-2-6)
10 - 60 Hz at 0.75 mm amplitude
60 - 2000 Hz at 10G acceleration
Soldering Parameters - Wave Soldering
Dwell Time
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
Time (Seconds)
Temperature (°C) - Measured on bottom side of board
Cooling Time
Preheat Time
Wave Parameter Lead-Free Recommendation
Preheat:
(Depends on Flux Activation Temperature) (Typical Industry Recommendation)
Temperature Minimum: 100°C
Temperature Maximum: 150°C
Preheat Time: 60-180 Seconds
Solder Pot Temperature: 260°C Maximum
Solder Dwell Time: 2-5 Seconds
Recommended Hand-Solder Parameters:
Solder Iron Temperature: 350° C +/- 5°C
Heating Time: 5 seconds max.
Note: These devices are not recommended for IR or
Convection Reflow process.
Recommended Process Parameters:
Revised: January 7, 2009
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
142 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
370 Series
Please refer to www.littelfuse.com/series/370.html for current information.
Radial Lead
TR5® > Fast-Acting > 370 Series
Dimensions
Holes in PCB
Part Numbering System
Packaging

Long Leads (L=18.8mm)
Short Leads (L=4.3mm)
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code Reel Size
370 Series
Tape & Ammopack N/A 1,000 000 N/A
Short Leads N/A 1,000 041 N/A
Packaging Code
Series