Revised: January 7, 2009
135
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
303 Series
Please refer to www.littelfuse.com/series/303.html for current information.
TR3® > Fast-Acting > 303 Series
303 Series
Description
Agency Approvals
Agency Agency File Number Ampere Range
E67006 50mA-5A
051378 50mA-5A
Features
Electrical Characteristics
% of Ampere
Rating Opening Time
200 60 Seconds, Maximum
Applications
Electrical Characteristics
Note: 1.00 means the number one with two decimal places. 1,000 means the number one thousand.
303 Series, TR3®, Fast-Acting Fuse
Amp Code Rated
Current
Voltage
Rating Breaking Capacity
Voltage
Drop
1.0 x IN
max. (mV)
Power
Dissipation
1.0 x IN
max. (mW)
Melting
Integral
10 x IN
max. (A2s)
Approvals
®
0050 50mA 125V
50A / 125VAC
60-60 Hz/cos ϕ - 1
50A / 63 VDC
800 40 0.00007 XX
0063 63mA 125V 780 50 0.00013 XX
0080 80mA 125V 730 60 0.0002 XX
0100 100mA 125V 700 70 0.0004 XX
0125 125mA 125V 650 85 0.0022 XX
0160 160mA 125V 600 100 0.0029 XX
0200 200mA 125V 550 110 0.0042 XX
0250 250mA 125V 500 125 0.0082 XX
0315 315mA 125V 450 145 0.015 XX
0400 400mA 125V 400 160 0.025 XX
0500 500mA 125V 380 190 0.042 XX
0630 630mA 125V 160 100 0.015 XX
0800 800mA 125V 155 125 0.025 XX
1100 1.00A 125V 150 155 0.039 XX
1125 1.25A 125V 145 185 0.059 XX
1160 1.60A 125V 140 225 0.11 XX
1200 2.00A 125V 130 260 0.17 XX
1250 2.50A 125V 125 315 0.23 XX
1315 3.15A 125V 120 380 0.45 XX
1400 4.00A 125V 110 440 1.0 XX
1500 5.00A 125V 105 525 1.5 XX
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The 303 Series are TR3®, fast-acting type, 125V rated
fuses designed in accordance to UL 248–14.
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Revised: January 7, 2009
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
136 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
303 Series
Please refer to www.littelfuse.com/series/303.html for current information.
TR3® > Fast-Acting > 303 Series
TT
TT
Time (sec.)ime (sec.)
ime (sec.)ime (sec.)
ime (sec.)
Contact Littelfuse for individual I-t curves
II
II
IFaultFault
FaultFault
Fault / I / I
/ I / I
/ IRatedRated
RatedRated
Rated
TR3 / No.
303303
303303
303
23456789011
0.001
0.01
0.1
1
10
100
1,000
10,000
100,000
151.5
UL 248-14
Test value
I-t Characteristics
(Min-Max Limit)
Average Time Current CurvesTemperature Rerating Curve
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:
0
20
40
60
80
100
120
140
-40-200 20406080
AMBIENT TEMPERATURE (°C)
PERCENT OF RATING
23°C
Revised: January 7, 2009
137
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
303 Series
Please refer to www.littelfuse.com/series/303.html for current information.
TR3® > Fast-Acting > 303 Series
303 Series
Product Characteristics
Operating Temperature -25ºC to +70ºC (consider de-rating)
Climatic Category -25ºC/+70ºC/21 days
(EN 60068-1..3)
Stock Conditions +10ºC to +60ºC RH,
≤ 75% yearly average, without dew
Vibration Resistance
24 cycles at 15 min. each
(EN 60068-6)
10 - 60 Hz at 0.75 mm amplitude
60 - 2000 Hz at 10 g acceleration
Ø 6
Ø 0,6
2,54
max. 8
L
1 +0,1
Materials
Base/Cap: Black Thermoplastic Base
Polyamide PA 6.6, UL 94V-0
Brass, Nickel-plated Cap
Round Pins: Copper alloy, 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)
Dimensions Part Numbering System
Dimensions (mm)
Holes in PCB
Long Leads (L=18.8 mm)
Short Leads (L=4.3 mm)
Packaging
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code Reel Size
303 Series
Tape & Ammopack N/A 1,500 000 N/A
Short Leads N/A 200 013 N/A
Short Leads N/A 300 042 N/A