04910.200MAT1HF [LITTELFUSE]
Electric Fuse;
LITTELFUSE 
Axial Lead & Cartridge Fuses
PICO® ll > Very Fast-Acting > 491 Series
PS
E
491 Series, PICꢀ® II, Very Fast-ꢁcting Fuse
Description
The PICO® II Very Fast-Acting Fuse is designed to meet an
extensive array of performance characteristics in a
space-saving subminiature package.
Features
•ꢀ Veryꢀfast-acting
•ꢀ Smallꢀsizeꢀ
•ꢀ Wideꢀcurrentꢀratingꢀrangeꢀ
(125mA - 10A)
•ꢀ Halogen-freeꢀavailableꢀ
•ꢀ Wideꢀoperatingꢀ
temperature range
•ꢀ Lowꢀtemperatureꢀde-rating
•ꢀ RoHSꢀcompliantꢀ
Agency Approvals
Applications
Agency
Agency File Number
Ampere Range
Secondary protection for space constrained applications
•ꢀ Flat–panelꢀdisplayꢀTVꢀ
•ꢀ LCDꢀmonitor
•ꢀ LCDꢀbacklightꢀinverter
•ꢀ Officeꢀmachines
•ꢀ Powerꢀsupply
E10480
LR 29862
125mA - 10A
•ꢀ Audio/Videoꢀsystem
•ꢀ Lightingꢀsystem
•ꢀ Medicalꢀequipment
125mA - 10A
1A - 5A
PS
E
JET 1896-31007-1001
Electrical Characteristics
% of Ampere
Rating
Ampere Rating
1/8-10
OpeningTime
100%
300%
4 Hours, Min.
1/8-10
0.3 Seconds, Max.
Electrical Characteristics
Agency Approvals
Max
Voltage
Rating
(V)
Ampere
Rating
(A)
Ordering
Number
(Std.)
Nominal Cold
Resistance
(Ohms)
Interrupting
Rating
Amp Code
PS
E
.125
.200
.250
.315
.400
.500
.630
.750
.800
1.00
1.25
1.50
1.60
2.00
2.50
3.00
3.15
3.50
4.00
5.00
7. 0 0
0.125
0.200
0.250
0.315
0.400
0.500
0.630
0.750
0.800
001.
0491.125
0491.200
0491.250
0491.315
0491.400
0491.500
0491.630
0491.750
0491.800
0491 001.
0491 1.25
0491 01.5
0491 01.6
0491 002.
0491 02.5
0491 003.
0491 3.15
0491 03.5
0491 004.
0491 005.
0491 007.
0491 010.
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
86
1.7000
0.8950
0.6650
0.5000
0.3230
0.3020
0.2050
0.1750
0.1480
0.1280
0.1000
0.0823
0.0700
0.0473
0.0360
0.0295
0.0275
0.0240
0.0204
0.0158
0.0107
0.0072
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
x
x
x
x
x
x
x
x
x
x
x
x
x
50A at
125Vac and
Vdc
1.25
01.5
01.6
002.
02.5
003.
3.15
03.5
004.
005.
0 0 7.
10.00
010.
86
Note: Higher ampere ratings are available. Please contact LittelfuseTechnical Support or your Littelfuse products representative for assistance.
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/26/13
Axial Lead & Cartridge Fuses
PICO® ll > Very Fast-Acting > 491 Series
Temperature Rerating Curve
AverageTime Current Curves
1000
100
10
1
Note:
1. Derating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
0.1
0.01
Soldering Parameters
Recommended Process Parameters:
0.1
1
10
100
1000
CURRENT IN AMPERES
Wave Parameter
Preheat:
(Depends on Flux ActivationTemperature)
Temperature Minimum:
Temperature Maximum:
PreheatTime:
Lead-Free Recommendation
(Typical Industry Recommendation)
100° C
150° C
60-180 seconds
Solder PotTemperature:
Solder DwellTime:
260° C Maximum
2-5 seconds
Recommended Hand-Solder Parameters:
Solder IronTemperature: 350° C +/- 5°C
HeatingTime: 5 seconds max.
Note:These devices are not recommended for IR or
Convection Reflow process.
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/26/13
Axial Lead & Cartridge Fuses
PICO® ll > Very Fast-Acting > 491 Series
Product Characteristics
Encapsulated, Epoxy-Coated
Body: PureTin-coated Copper wire leads
Operating Temperature –55ºC to +125ºC
Materials
MIL-STD-202, Method 213, Test
Condition I (100 G’s peak for 6
milliseconds)
Solderability
Lead Pull Force
MIL-STD-202, Method 208
Shock
MIL-STD-202, Method 211, Test Condition
A (will withstand a 7lbs. axial pull test)
MIL-STD-202, Method 201 (10–55
Hz); Method 204, Test Condition C
(55–2000 Hz at 10 G’s Peak)
Vibration
Moisture Resistance
MIL-STD-202, Method 106
Withstands 60 seconds above 200OC
and up to 260ºC, maximum
Resistance to Soldering
Heat
Flammability Rating
UL 94V–0
Part Numbering System
Dimensions
0491 xxxx N R T1 HF
491 Series (RoHS Version) Markings
(T1 lead length)
62.7 (2.468")
Series
52.4 (2.062")*
27.78
27.78
Current Rating
(1.094")
(1.094")
7.11 (.280")
Refer to Amp Code column of
Electrical Characteristics Table
F
0.5
0.5
L
2.80 (.11")
MAX
Quantity
N = 5000
M = 1000
5.0 (.197")
6.35 (.25")
tape
6.35 (.25")
tape
F
L
Wire Diameter:
0.64 (.025")
Type of Packaging
R = Reel
A = Ammo Pack
491 Series (RoHS and Halogen-free Version) Markings
(T1 lead length)
Lead Length
62.7 (2.468")
The default lead length for Ammo pack and
Loose pack is now T1
T1 = 52.4mm (2.062”)
52.4 (2.062")*
27.78
(1.094")
27.78
(1.094")
7.11 (.280")
F
0.5
0.5
L
Option Codes
Blank = RoHS
2.80 (.11")
MAX
5.0 (.197")
6.35 (.25")
tape
6.35 (.25")
tape
HF
= RoHS and Halogen-free
F
L
Wire Diameter:
0.64 (.025")
Packaging
Quantity &
Packaging Code
Packaging Option
Packaging Specification
Please refer to available quantities
above in "Part Numbering System”
*T1: 52.4mm (2.062")Tape and Reel
EIA 296
Notes:
* T1 dimension is defined as the length of the component between the two tapes. The full component length is 62.7mm (2.468").
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/26/13
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