Cartridge, Axial Lead, and Socket Fuses
PICO
®
II > Very Fast-Acting > 251/253 Series
RoHS
251/253 Series,
PICO
®
II, Very Fast-Acting Fuse
Description
®
®
PS
E
TUV
The PICO
®
II very fast-acting fuse is designed to meet an
extensive array of performance characteristics in a
space-saving subminiature package.
Features
temperature range
(62mA- 15A)
Applications
Agency Approvals
Agency
®
Secondary protection for space constrained applications
Ampere Range
Agency File Number
E10480
®
62mA - 15A
62mA - 15A
1A - 5A
500mA - 10A
LR 29862
JET 1896-31007-1001
J02037794
PS
E
Electrical Characteristics
% of Ampere
Rating
100%
200%
Ampere Rating
1/16–15
1/16–7
10
12-15
Opening Time
4 hours, Minimum
1 sec., Maximum
3 sec., Maximum
10 sec., Maximum
TUV
Electrical Characteristics
Ampere
Rating
(A)
1/16
1/8
1/4
3/8
1/2
3/4
1
11/4
11/2
2
21/2
3
31/2
4
5
7
10
12
15
Amp
Code
.062
.125
.250
.375
.500
.750
001.
1.25
01.5
002.
02.5
003.
03.5
004.
005.
007
.
010.
012.
015.
Max
Ordering Ordering
Nominal Cold
Voltage Interrupting
Number Number
Resistance
Rating
Rating
(Std.)
(Mil.)
(Ohms)
(V)
251.062
253.062
125
7
.000
251.125
253.125
125
1.700
251.250
253.250
125
0.665
251.375
253.375
125
0.395
251.500
253.500
125
0.280
251.750
253.750
125
0.175
251001.
253001.
125
0.128
300 amperes
2511.25
125
0.100
at rated
25101.5
25301.5
125
0.0823
voltage VDC
251002.
253002.
125
0.0473
50 amperes at
25102.5
125
0.0360
rated voltage
251003.
253003.
125
0.0290
VAC
25103.5
125
0.0240
251004.
253004.
125
0.0204
251005.
253005.
125
0.0155
251007
.
253007
.
125
0.0105
251010.
253010.
125
0.00705
251012.
32
0.0055
251015.
253015.
32
0.00446
Nominal
Melting
I
2
t (A
2
sec)
0.000113
0.00174
0.0116
0.0296
0.0598
0.153
0.256
0.390
0.587
0.405
0.721
1.19
1.58
2.45
4.14
10.4
25.5
45.2
68.8
Nom
Voltage Drop
(mV)
1.4
0.285
0.24
0.215
0.2165
0.176
0.194
0.2
0.21
0.141
0.132
0.131
0.1205
0.114
0.11
0.102
0.1
0.0878
0.071
Agency Approvals
®
®
PS
E
TUV
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
x
x
x
x
x
x
x
x
x
Note: Higher ampere ratings are available. Please contact Littelfuse Technical Support or your Littelfuse products representative for assistance.
©2008 Littelfuse, Inc.
1
Specifications are subject to change without notice.
Revised: April 23, 2008
Please refer to www.littelfuse.com for the most current information for current information.
http://www.littelfuse.com/series/251.html or /253.html
251/253 Series
Cartridge, Axial Lead, and Socket Fuses
PICO
®
II > Very Fast-Acting > 251/253 Series
Temperature Rerating Curve
Average Time Current Curves
1/4A
3/8A
1/2A
3/4A
1A
1 1/4A
1 1/2A
2A
2 1/2A
3A
3 1/2A
4A
5A
7A
10A
12A
15A
1
10
100
CURRENT IN AMPERES
1/16A
100
10
TIME IN SECONDS
1
0.1
0.01
0.001
0.05 0.1
1/8A
1000
Soldering Parameters - Wave Soldering
Recommended Process Parameters:
300
Temperature
(°C) - Measured on bottom side of board
280
260
240
220
200
180
160
140
120
100
80
60
40
20
100
110
120
130
140
160
170
180
190
200
210
220
230
240
150
10
20
30
40
50
60
70
80
90
0
0
Wave
Parameter
Preheat:
(Depends on Flux Activation Temperature)
Lead-Free Recommendation
(Typical Industry 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
251/253 Series
2
Revised: April 23, 2008
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for the most current information
Please refer to http://www.littelfuse.com/series/251.html or /253.html for current information.
Cartridge, Axial Lead, and Socket Fuses
PICO
®
II > Very Fast-Acting > 251/253 Series
Product Characteristics
Encapsulated, Epoxy-Coated
Body: Wire Leads. Pure Tin coated
copper wire leads
MIL-STD-202, Method 208
MIL-STD-202. Method 211. Test Condition
A (will withstand a 7 lb. axial pull test).
J-STD 020 MSL Rating 2
Operating Temperature
Shock
–55
O
C to 125
O
C
MIL
-STD-202, Method 213, Test
Condition I (100 G’s peak for 6
milliseconds)
MIL
-STD-202, Method 201 (10–55
Vibration
Moisture Resistance
Resistance to Soldering
Heat
Flammability Rating
MIL
-STD-202, Method 106
Withstands 60 seconds above 200
O
C
and up to 260
O
C, maximum
UL 94V0
Materials
Solderability
Lead Pull Force
Moisture Sensitivity
Level
Dimensions
62.7 (2.468")
27.78
(1.094")
**0.64 (.025")
52.4 (2.062")*
7.11 (.280")
27.78
(1.094")
2.80 (.11")
Part Numbering System
0251 xxxx N R T1 L
Series
251 = Standard type
253 = Military type
6.35 (.25")
tape
1A
6.35 (.25")
tape
5.0 (.197")
F
L
Current Rating
Refer to Amp Code column of
Electrical Characteristics Table
1A
F
L
Quantity
N = 5000
P = 2000
M = 1000
H = 100
V =5
251 series markings
F
L
1A
253 series markings
Type of Packaging
R = Reel
A = Ammo Pack
X = Loose Pack
Lead Length
T1: 52.4mm (2.062”)*
RoHS
Packaging
Packaging Option
*T1: 52.4mm (2.062") Tape and Reel
Packaging Specification
EIA 296
Quantity &
Packaging Code
above in "Part Numbering System”
** .025” diameter for 1/16–10A, .032” diameter for 12–15A.
©2008 Littelfuse, Inc.
3
Specifications are subject to change without notice.
Revised: April 23, 2008
Please refer to www.littelfuse.com for the most current information for current information.
http://www.littelfuse.com/series/251.html or /253.html
251/253 Series
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