Revised: January 7, 2009
143
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
372 Series
Please refer to www.littelfuse.com/series/372.html for current information.
TR5® > Time-Lag > 372 Series
372 Series
372 Series, TR5®, Time-Lag Fuse
Agency Approvals
Agency Agency File Number Ampere Range
5007679-1170-0003/82447 50mA - 4A
5007679-1170-0004/82452 5A - 6.3A
JET1896-31007-2002 1A - 5A
709066 50mA - 6.3A
E67006 40mA - 6.3A
SU05024-7010
SU05024-7011
SU05024-7006
SU05024-7007
SU05024-7008
SU05024-7009
SU05024-7012
50mA - 100mA
125mA - 800mA
1A - 2.5A
3.15A
4A
5A
6.3A
CQC07012021162 5A - 6.3A
2007010207240346 40mA - 4A
Features
Electrical Characteristics
t -FBEGSFF
t 3FEVDFE1$#TQBDF
requirements
t %JSFDUTPMEFSBCMFPS
plug-in versions
t *OUFSOBUJPOBMMZ
approved
t -PXJOUFSOBMSFTJTUBODF
t 4IPDLTBGFDBTJOH
t 7JCSBUJPOSFTJTUBOU
t )BMPHFOGSFF
t "WBJMBCMFGSPNN"
to 6.3A
% of Ampere
Rating Opening Time
150% 1 Hour, Min.
210% 2 Minutes, Max.
275% 400 ms, Min. ; 10 Sec., Max.
400% 150 ms, Min. ; 3 Sec., Max.
1000% 20 ms, Min. ; 150 ms, Max.
Applications
The 372 Series are TR5®, time-Lag type, 250V rated fuses,
that are designed in accordance to IEC 60127-3.
t #BUUFSZ$IBSHFST
t $POTVNFSFMFDUSPOJDT
t 1PXFSTVQQMJFT
t *OEVTUSJBM$POUSPMMFST
Description
Revised: January 7, 2009
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
144 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
372 Series
Please refer to www.littelfuse.com/series/372.html for current information.
TR5® > Time-Lag > 372 Series
Average Time Current CurvesTemperature Rerating Curve
0
20
40
60
80
100
120
140
-40-20 0 20406080
AMBIENT TEMPERATURE (°C)
PERCENT OF RATING
23°C
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
min. (A2s)
Agency Approvals
0040 40mA 250V
35A/250VAC1
50-60 Hz cos ϕ = 1.0
900 90 0.009 X
0050 50mA 250V 500 70 0.01 XX X X X
0063 63mA 250V 400 80 0.02 XX X X X
0080 80mA 250V 370 100 0.023 XX X X X
0100 100mA 250V 300 110 0.047 XX X X X
0125 125mA 250V 260 120 0.066 XX X X X
0160 160mA 250V 200 130 0.14 XX X X X
0200 200mA 250V 170 140 0.20 XX X X X
0250 250mA 250V 150 150 0.28 XX X X X
0315 315mA 250V 140 160 0.36 XX X X X
0400 400mA 250V 130 170 0.9 XX X X X
0500 500mA 250V 125 180 1.3 XX X X X
0630 630mA 250V 120 200 2.5 XX X X X
0800 800mA 250V 110 220 3.8 XX X X X
1100 1.00A 250V 110 360 5.5 XX X X X X
1125 1.25A 250V 95 450 9 XX X X X X
1160 1.60A 250V 95 450 14 XX X X X X
1200 2.00A 250V 85 600 23 XX X X X X
1250 2.50A 250V 80 700 35 XX X X X X
1315 3.15A 250V 80 1100 60 XX X X X X
1400 4.00A 250V 40A / 250 VAC 75 1200 95 XX X X X X
1500 5.00A 250V 50A / 250 VAC 80 1300 94 G X X X CQC X
1630 6.30A* 250V 58 1250 105 G X X CQC X
1 Per UL, approved breaking capacity is 50 A at 250 V.
* Conducting path min. 0.2 mm2
G = Expert Report
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
0.040A
0.050A
0.063A
0.080A
0.100A
0.125A
0.160A
0.200A
0.250A
0.315A
0.400A
0.500A
0.630A
0.800A
1.00A
1.25A
1.60A
2.00A
2.50A
3.15A
4.00A
5.00A
6.30A
Revised: January 7, 2009
145
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
372 Series
Please refer to www.littelfuse.com/series/372.html for current information.
TR5® > Time-Lag > 372 Series
372 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/+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’s 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
146 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
372 Series
Please refer to www.littelfuse.com/series/372.html for current information.
TR5® > Time-Lag > 372 Series
Dimensions

Long Leads (L=18.8mm)
Short Leads (L=4.3mm)
Part Numbering System
Packaging
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code Reel Size
372 Series
Tape & Ammopack N/A 1,000 000 N/A
Short Leads N/A 1,000 041 N/A
Short Leads N/A 200 043 N/A
3.3mm Leads N/A 1,000 051 N/A
Packaging Code
Series