Datasheet

Axial Lead & Cartridge Fuses
PICO® ll > Very Fast-Acting Fuse > 251/253 Series
251/253 Series, PICO® II Very Fast-Acting Fuse
PS
E
QPL
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
• Very fast-acting
• Halogen-free available
• Small size
• Wide operating
temperature range
• Wide current rating range
(0.062A- 15A)
• Low temperature re-rating
Applications
Agency Approvals
Agency File
Agency
Number
Secondary protection for space constrained applications
Agency File Number
251 Series
253 Series
PS
E
QPL
Ampere Range
• Flat–panel display TV
• Power supply
• LCD monitor
• Audio/Video system
N/A
E10480
0.062A - 15A
• LCD backlight inverter
• Lighting system
N/A
29862
0.062A - 15A
• Office machines
• Medical equipment
N/A
JET1896-310071004
1A - 5A
N/A
J50158379
0.500A - 10A
FM10
N/A
0.062A - 15A
N/A
2009010207366577
0.500A, 1A, 2A,
2.5A, 3A, 4A, 5A
Electrical Characteristics for Series
% of Ampere
Rating
Ampere Rating
Opening Time
100%
0.062A - 15A
4 Hours, Min.
200%
275%
Additional Information
400%
Datasheet
251 Series
Resources
251 Series
Samples
251 Series
Datasheet
253 Series
Resources
253 Series
Samples
253 Series
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice. Application testing is strongly recommended.
Revised: 11/11/15
1000%
0.062A - 7A
1 Second, Max.
10A
3 Seconds, Max.
12 - 15A
10 Seconds, Max.
0.500A, 1A, 2A,
2.5A, 3A, 4A, 5A,
7A, 10A
0.05A, 1A, 2A,
2.5A, 3A, 4A, 5A,
7A, 10A
0.500A, 1A, 2A,
2.5A, 3A, 4A, 5A,
7A, 10A
300 msecs., Max.
30 msecs., Max.
4 msecs., Max.
Axial Lead & Cartridge Fuses
PICO® ll > Very Fast-Acting Fuse > 251/253 Series
Electrical Specifications by Item
Agency Approvals
Nom
Max
Nominal
Ampere
Nominal
Ordering Ordering
Voltage
Amp
Voltage Interrupting
Cold
Rating
Melting
Number Number
Drop
Code
Rating
Rating
Resistance 2
(A)
I t (A2 sec)
(Std.)
(Mil.)
(V)
(V)
(Ohms)
.062
.125
.200
.250
.375
.500
.630
.750
1.00
1.25
1.50
2.00
2.50
3.00
3.50
4.00
5.00
7.00
10.0
12.0
15.0
.062
.125
.200
.250
.375
.500
.630
.750
001.
1.25
01.5
002.
02.5
003.
03.5
004.
005.
007.
010.
012.
015.
251.062
251.125
251.200
251.250
251.375
251.500
251.630
251.750
251001.
2511.25
25101.5
251002.
25102.5
251003.
25103.5
251004.
251005.
251007.
251010.
251012.
251015.
253.062
253.125
253.200
253.250
253.375
253.500
253.750
253001.
25301.5
253002.
253003.
253004.
253005.
253007.
253010.
253015.
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
32
32
300 A @
125VDC
[email protected]
For CCC 7A:
[email protected]
For CCC 10A:
100A@
125VAC
[email protected]
& [email protected]
7.000
1.700
0.895
0.665
0.395
0.302
0.205
0.175
0.128
0.100
0.0823
0.0473
0.0360
0.0295
0.0240
0.0204
0.0158
0.0107
0.0072
0.0059
0.00446
0.000113
0.00174
0.0048
0.0116
0.0296
0.0598
0.08
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
1.4
0.285
0.345
0.24
0.215
0.2165
0.188
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
PS
E
QPL
TUV 253
Series
Only
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
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.
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/11/15
Axial Lead & Cartridge Fuses
PICO® ll > Very Fast-Acting Fuse > 251/253 Series
.250A
.375A
.500A
.630A
.750A
1A
1.25A
1.5A
2A
2.5A
3A
3.5A
4A
5A
7A
10A
12A
15A
100
.125A
Average Time Current Curves
.062A
Temperature Re-rating Curve
TIME IN SECONDS
10
1
0.1
Note:
1. Re-rating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
0.01
Soldering Parameters
Recommended Process Parameters:
Lead-Free Recommendation
for 251 Series only
Wave Parameter
Preheat:
(Depends on Flux Activation Temperature)
(Typical Industry Recommendation)
Temperature Minimum:
100°C
Temperature Maximum:
Preheat Time:
150°C
60-180 seconds
Solder Pot Temperature:
260°C Maximum
Solder Dwell Time:
2-5 seconds
Recommended Hand Soldering 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
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/11/15
0.001
0.05 0.1
1
10
CURRENT IN AMPERES
100
1000
Axial Lead & Cartridge Fuses
PICO® ll > Very Fast-Acting Fuse > 251/253 Series
Product Characteristics
Vibration
MIL-STD-202, Method 201 (10–55
Hz); Method 204, Test Condition C
(55–2000 Hz at 10 G’s Peak)
MIL-STD-202, Method 211, Test Condition
A (will withstand a 7lbs. axial pull test)
Shock
MIL-STD-202, Method 213, Test
Condition I (100 G’s peak for 6
msecs.)
Fuses To MIL SPEC
For fuses to MIL-PRF-23419, FM10
change the series number from
251 to 253
Insulation Resistance
(After Opening):
MIL-STD-202, Method 302,
Test Condition A (10,000 ohms
minimum at 100 volts)
Operating
Temperature
–55ºC to +125ºC (Consider re-rating)
Moisture Resistance
MIL-STD-202, Method 106
Resistance to Soldering
Heat
Withstands 60 seconds above 200OC
and up to 260ºC, maximum
Flammability Rating
UL 94V–0
Materials
Encapsulated, Epoxy-Coated
Body: Pure Tin-coated Copper wire leads
Solderability
MIL-STD-202, Method 208
Lead Pull Force
Part Numbering System
Dimensions
251 Series Markings
(T1 lead length)
62.7 (2.468")
52.4 (2.062")*
27.78
(1.094")
7.11 (.280")
1A
6.35 (.25")
tape
LF
5.0 (.197")
1A
0251 xxxx N R T1 L
Series
27.78
(1.094")
2.80
(.11")
MAX
251 = Standard type
253 = Military type
6.35 (.25")
tape
LF
N = 5000
P = 2000
M = 1000
H = 100
251 Series (Halogen-free Version) Markings
27.78
(1.094")
6.35 (.25")
tape
7.11 (.280")
LF
1A
1A
LF
27.78
(1.094")
2.80
(.11")
MAX
5.0 (.197")
Type of Packaging
6.35 (.25")
tape
253 Series Markings
(T3 lead length)
83.31 (3.28")
6.35 (.25")
tape
73.0 (2.874")**
7.11 (.280")
LF
1A
LF
1A
Lead Length
Option Codes
38.1
(1.5")
2.61 (.103")
MAX
5.0 (.197")
R = Reel
A = Ammo Pack
X = Loose Pack
The default lead length for Ammo pack and
Loose pack is now T1 for 251 series, and
remains T3 for 253 series, therefore:
T1 = 52.4mm (2.062”), 251 series only*
Blank = 52.4mm (2.062”) for 251 series*
or 73mm (2.874”) for 253 series**
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 12-15 amp
38.1
(1.5")
Refer to Amp Code column of
Electrical Specifications Table
Quantity
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 12-15 amp
(T1 lead length)
62.7 (2.468")
52.4 (2.062")*
Current Rating
L = RoHS + HF
(Only applies to 251 Series)
6.35 (.25")
tape
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 15 amp
Packaging
Packaging Option
Packaging Specification
*T1: 52.4mm (2.062") Tape and Reel
EIA 296
**T3: 73mm (2.874') Tape and Reel
EIA 296
Quantity &
Packaging Code
Please refer to available quantities
above in "Part Numbering System”
The default lead length for both ammo pack and loose pack is T1 for 251 and is T3 for 253.
Notes: * T1 dimension is defined as the length of the component between the two tapes. The full component length is 62.7mm (2.468"). T1 length is for 251 series only.
** T3 dimension is defined as the length of the component between the two tapes. The full component length is 83.3.7mm (3.28”). T3 length is for 253 series only.
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/11/15