Radial Lead Fuses
TR3 > Fast-Acting Fuse > 303 Series
303 Series, TR3, Fast-Acting Fuse
Description
RoHS
Pb
The 303 Series are TR3, fast-acting type, 125V rated
fuses designed in accordance to UL 248–14.
Features
• Reduced PCB space
requirements
• Direct solderable or
plug-in versions
• Internationally approved
Agency Approvals
Agency
Agency File Number
Ampere Range
• Vibration resistant
• RoHS compliant, Lead-
Free and Halogen-Free
• Available from 0.050A
to 5A
• Low internal resistance
• Shock safe casing
Applications
• Battery chargers
• Consumer electronics
• Power supplies
• Industrial controllers
E67006
051378
0.050A - 5A
0.050A - 5A
Electrical Characteristics
% of Ampere
Rating
200
Opening Time
60 Seconds, Maximum
Additional Information
Datasheet
Resources
Samples
Electrical Characteristics
Nominal Cold
Resistance
(Ohms)
2.9203
2.7400
2.2300
4.3800
3.4605
2.1687
1.3500
1.1500
0.9645
0.8050
0.5320
0.1448
0.1023
0.0830
0.0644
0.0520
0.0400
0.0307
0.0262
0.0178
0.0131
Voltage
Drop
1.0×I
N
max. (mV)
800
780
730
700
650
600
550
500
450
400
380
160
155
150
145
140
130
125
120
110
105
Power
Dissipation
1.0×I
N
max. (mW)
40
50
60
70
85
100
110
125
145
160
190
100
125
155
185
225
260
315
380
440
525
Melting
Integral
10×I
N
max. (A
2
s)
0.00007
0.00013
0.0002
0.0004
0.0022
0.0029
0.0042
0.0082
0.015
0.025
0.042
0.015
0.025
0.039
0.059
0.11
0.17
0.23
0.45
1.0
1.5
Approvals
®
Amp
Code
0050
0063
0080
0100
0125
0160
0200
0250
0315
0400
0500
0630
0800
1100
1125
1160
1200
1250
1315
1400
1500
Rated
Current
50mA
63mA
80mA
100mA
125mA
160mA
200mA
250mA
315mA
400mA
500mA
630mA
800mA
1.00A
1.25A
1.60A
2.00A
2.50A
3.15A
4.00A
5.00A
Voltage
Rating
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
125V
Breaking
Capacity
50A @ 125VAC
50A @ 63VDC
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
X
X
X
X
X
X
X
X
X
X
X
X
Note: 1.00 means the number one with two decimal places. 1,000 means the number one thousand.
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice. Application testing is strongly recommended.
Revised: 04/29/16
Radial Lead Fuses
TR3 > Fast-Acting Fuse > 303 Series
FAST ACTING DE-RATING CURVE
Temperature Re-rating Curve
Average Time Current Curves
0.400A
0.500A
140
120
1000
PERCENT OF RATING
100
80
60
40
20
0
-40
-20
0
20
40
60
80
100
23°C
10
AMBIENT TEMPERATURE (°C)
TIME IN SECONDS
1
Note
1. Rerating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
0.1
0.01
0.001
0.01
0.1
0.630A
0.800A
1A
1.25A
1.60A
2A
2.50A
3A
3.15A
4A
5A
0.050A
0.063A
0.080A
0.100A
0.125A
0.160A
0.200A
0.250A
0.315A
1
10
100
1000
CURRENT IN AMPERES
Soldering Parameters - Wave Soldering
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
10
20
30
40
50
60
70
80
90
0
0
Recommended Process Parameters:
Wave Parameter
Preheat:
(Depends on Flux Activation Temperature)
(Typical Industry Recommendation)
Temperature (°C) - Measured on bottom side of board
Lead-Free Recommendation
Temperature Minimum:
Temperature Maximum:
Preheat Time:
Solder Pot Temperature:
Solder Dwell Time:
100
°
C
150
°
C
60-180 seconds
260
°
C Maximum
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.
Time (Seconds)
Preheat Time
Dwell Time
Cooling Time
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 04/29/16
Radial Lead Fuses
TR3 > Fast-Acting Fuse > 303 Series
Product Characteristics
Base/Cap: Black Thermoplastic Base
Polyamide PA 6.6, UL 94V-0
Brass, Nickel-plated Cap
Round Pins: Copper alloy, Tin–plated
10 N (IEC 60068-2-21)
260ºC, ≤ 3s. (Wave)
350ºC, ≤ 1s. (Soldering Iron)
260ºC, 10s. (IEC 60068-2-20)
350ºC, 3s. (Soldering Iron)
Vibration Resistance
Operating Temperature
Climatic Category
Stock Conditions
-25ºC to +70ºC (consider de-rating)
-25ºC/+70ºC/21 days
(IEC 60068-1-3)
+10ºC to +60ºC RH,
≤75% yearly average, without dew
24 cycles at 15 min. each
(IEC 60068-6)
10 - 60 Hz at 0.75 mm amplitude
60 - 2000 Hz at 10 g acceleration
Materials
Lead Pull Strength
Solderability
Soldering Heat
Resistance
Dimensions
Ø6
Part Numbering System
303 xxxx 0001
max. 8
2,54
L
1 +0,1
Ø 0,6
Dimensions (mm)
Holes in PCB
Long Leads (L=18.8 mm)
Short Leads (L=4.3 mm)
0001 Tape/Ammopack (1,500 pcs.)
0131 Long Leads - Bulk (200 pcs.)
0421 Short Leads - Bulk (300 pcs.)
Packaging
Packaging Option
303 Series
Tape & Ammopack
Long Leads
Short Leads
Packaging Specification
N/A
N/A
N/A
Quantity
1,500
200
300
Quantity &
Packaging Code
0001
0131
0421
Reel Size
N/A
N/A
N/A
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 04/29/16
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