© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/15/18
Axial Lead & Cartridge Fuses
PICO® ll > Slo-Blo® Fuse > 473 Series
473 Series, PICO® II Slo-Blo® Fuse
Description
The PICO® II Slo-Blo® Fuse combines time-delay
performance characteristics with the proven reliability of
a PICO® Fuse.
Agency Approvals
Agency Agency File Number Ampere Range
E10480 0.375A - 7A
29862 0.375A - 7A
PS
ENBK200416-JP1021 1A - 5A
Features
Electrical Characteristics
• Enhanced inrush
withstand
• Small size
• Wide range of current
ratings (0.375A - 7A)
• Halogen free and RoHS
complaint
• Wide operating
temperature range
• Low temperature
rerating
% of Ampere
Rating Opening Time
100% 4 Hours, Min.
200% 1 Sec., Min.; 60 Sec., Max.
300% 0.2 Sec., Min.; 3 Sec., Max.
800% 0.002 Sec., Min.; 0.1 Sec., Max.
Applications
RoHS
Ampere
Rating
(A)
Amp
Code
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2 sec)
Nom
Voltage Drop
(mV)
Agency Approvals
PS
E
0.375 .375 125
50A@125VAC/DC
1.7550 0.085 0.840 X X
0.500 .500 125 1.1370 0.210 0.775 X X
0.750 .750 125 0.4900 0.760 0.429 X X
1.00 001. 125 0.3000 2.010 0.353 XXX
1.50 01.5 125 0.1170 3.940 0.208 XXX
2.00 002. 125 0.0720 7.600 0.180 XXX
2.25 2.25 125 0.0640 9.280 0.164 XXX
2.50 02.5 125 0.0520 13.00 0.153 XXX
3.00 003. 125 0.0380 21.00 0.140 XXX
3.50 03.5 125 0.0240 26.80 0.094 XXX
4.00 004. 125 0.0200 35.00 0.086 XXX
5.00 005. 125 0.0133 54.80 0.074 XXX
7.0 0 0 07. 125 0.0092 105.00 0.070 X X
Electrical Characteristics
• Flat–panel Display TV
• LCD monitor
• Lighting system
• Medical equipment
• Industrial equipment
PS
E
Application testing is strongly recommended.
Additional Information
Datasheet Samples
Resources
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/15/18
Axial Lead & Cartridge Fuses
PICO® ll > Slo-Blo® Fuse > 473 Series
Average Time Current Curves
1000
100
10
1
0.1
0.01
10001001010.1
.375A
.50A
.75A
1.0A
1.5A
2.0A
2.5A
3.0A
3.5A
4.0A
5.0A
7.0A
TIME IN SECONDS
CURRENT IN AMPERES
Temperature Re-rating Curve
Soldering Parameters
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:
Note:
Rerating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/15/18
Axial Lead & Cartridge Fuses
PICO® ll > Slo-Blo® Fuse > 473 Series
Materials
Encapsulated, Epoxy-Coated Body;
Solder Coated Copper wire leads;
RoHS compliant Product: Pure Tin-coated
Copper wire leads
Solderability MIL-STD-202, Method 208
Lead Pull Force MIL-STD-202, Method 211, Test Condition
A (will withstand 7 lbs. axial pull test)
Operating
Temperature –60ºC to +125ºC (Consider re-rating)
Shock MIL-STD-202, Method 213, Test Condition
I (100 G’s peak for 6 milliseconds)
Product Characteristics
Vibration
MIL-STD-202, Method 201 (10–55
Hz); MIL-STD-202, Method 204, Test
Condition C (55–2000 Hz at 10 G’s
Peak)
Salt Spray MIL-STD-202, Method 101, Test
Condition B
Insulation Resistance
(After Opening):
MIL-STD-202, Method 302, (10,000
ohms minimum at 100 volts)
Resistance to Soldering
Heat
MIL-STD-202, Method 210, Test
Condition C (20 sec at 260ºC)
Thermal Shock MIL-STD-202, Method 107, Test
Condition B (–65ºC to 125ºC)
Moisture Resistance MIL-STD-202, Method 106 (90–98%
RH), Heat (65ºC)
F
L
1 A
F
L
1 A
27.78
(1.094")
27.78
(1.094")
7.11 (.280")
62.7 (2.468")
52.4 (2.062")*
473 series markings
0.64 (.025")
6.35 (.25")
tape
5.0 (.197")
6.35 (.25")
tape
3.43 (.135")
MAX
Dimensions Part Numbering System
0473 xxxx Y R T1 L
RoHS + HF
Lead Length
Type of Packaging
Quantity
Current Rating
Series
T1: 52.4mm (2.062”)*
R = Reel
A = Ammo Pack
X = Loose Pack
Y = 4000
P = 2000
M = 1000
Refer to Amp Code column of
Electrical Characteristics Table
Packaging
Packaging Option Packaging Specification Quantity &
Packaging Code
*T1: 52.4mm (2.062") Tape and Reel EIA 296 Please refer to available quantities above
in "Part Numbering System”
Notes: * T1 dimension is defined as the length of the component between the two tapes. The full component length is 62.7mm (2.468").
Disclaimer Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military,
aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other
application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those
expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any
purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products
used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is
subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Information furnished is believed to be accurate and reliable.
However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not
designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
