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Littelfuse 253 Series PICO II Manual de usuario Pagina 4

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© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/25/14
Axial Lead & Cartridge Fuses
PICO
®
ll > Very Fast-Acting > 251/253 Series
Materials
Encapsulated,Epoxy-Coated
Body: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a7lbs.axialpulltest)
Fuses To MIL SPEC
251/253SeriesisavailableinFM10on
QPL for MIL-PRF-23419. To order, change
251 to 253
Operating
Temperature
–55ºCto+125ºC
Product Characteristics
Vibration
MIL-STD-202,Method201(10–55
Hz);Method204,TestConditionC
(55–2000Hzat10G’sPeak)
Shock
MIL-STD-202,Method213,Test
ConditionI(100G’speakfor6
msecs.)
Insulation Resistance
(After Opening):
MIL-STD-202,Method302,
Test Condition A (10,000 ohms
minimumat100volts)
Moisture Resistance MIL-STD-202,Method106
Resistance to Soldering
Heat
Withstands60secondsabove200
O
C
and up to 260ºC, maximum
Flammability Rating UL 94V–0
Dimensions
Packaging
Part Numbering System
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”
**T3:73mm(2.874')TapeandReel EIA 296
0251 xxxx N R T1
Lead Length
Type of Packaging
Quantity
Current Rating
Series
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**
R = Reel
A = Ammo Pack
X = Loose Pack
N = 5000
P = 2000
M = 1000
H = 100
Refer to Amp Code column of
Electrical Specifications Table
251
= Standard type
253
= Military type
Option Codes
L
L = RoHS + HF
(Only applies to 251 Series)
ThedefaultleadlengthforbothammopackandloosepackisT1for251andisT3for253.
Notes: *T1dimensionisdened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dened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.
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 15 amp
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 12-15 amp
2.61 (.103")
MAX
6.35 (.25")
tape
5.0 (.197")
6.35 (.25")
tape
38.1
(1.5")
38.1
(1.5")
7.11 (.280")
83.31 (3.28")
253 Series Markings
(T3 lead length)
L
1 A
L
1 A
73.0 (2.874")**
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")*
2.80
(.11")
MAX
6.35 (.25")
tape
5.0 (.197")
6.35 (.25")
tape
251 Series (Halogen-free Version) Markings
(T1 lead length)
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 12-15 amp
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")*
2.80
(.11")
MAX
6.35 (.25")
tape
5.0 (.197")
6.35 (.25")
tape
251 Series Markings
(T1 lead length)
F
F
F
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