0253.125V Datasheet, PDF (4/4 Pages) Littelfuse – Axial Lead & Cartridge Fuses PICO ll > Very Fast-Acting > 251/253 Series

Axial Lead & Cartridge Fuses
PICO^® ll > Very Fast-Acting > 251/253 Series
Product Characteristics
Materials
Solderability
Lead Pull Force
Fuses To MIL SPEC
&ODBQTVMBUFE
&QPYZ$PBUFE

Body:
1VSF
5JODPBUFE
$PQQFS
XJSF
MFBET
.*-45%
.FUIPE

.*-45%
.FUIPE

5FTU
$POEJUJPO

"
XJMM
XJUITUBOE
B
MCT
BYJBM
QVMM
UFTU

4FSJFT
JT
BWBJMBCMF
JO
'.
PO

QPL for MIL-PRF-23419. To order, change
251 to 253
Operating Temperature o$
UP
$
Shock
Vibration
.*-45%
.FUIPE

5FTU

Condition I (100 G’s peak for 6
msecs.)
.*-45%
.FUIPE

o

)[ 
.FUIPE

5FTU
$POEJUJPO
$

o
)[
BU

(T
1FBL
Moisture Resistance
.*-45%
.FUIPE

Resistance to Soldering 8JUITUBOET

TFDPOET
BCPWF
^OC
Heat
and up to 260ºC, maximum
Flammability Rating
UL 94V–0
Dimensions
251 Series (RoHS Version) Markings
(T1 lead length)
62.7 (2.468")
27.78
(1.094")
52.4 (2.062")*
7.11 (.280")
27.78
(1.094")
1 A LF
6.35 (.25")
tape
5.0 (.197")
1 A LF
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 12-15 amp
2.80
(.11")
MAX
6.35 (.25")
tape
251 Series (RoHS and Halogen-free Version) Markings
(T1 lead length)
62.7 (2.468")
27.78
(1.094")
52.4 (2.062")*
7.11 (.280")
27.78
(1.094")
L^{F 1 A}
6.35 (.25")
tape
5.0 (.197")
1 A LF
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 12-15 amp
2.80
(.11")
MAX
6.35 (.25")
tape
253 Series (RoHS Version) Markings
(T3 lead length)
83.31 (3.28")
38.1
(1.5")
73.0 (2.874")**
7.11 (.280")
38.1
(1.5")
L^{F 1 A}
6.35 (.25")
tape
5.0 (.197")
L^F 1 A
Wire Diameter:
0.64 (.025") for 0.62-10.0 amp,
0.81 (.032") for 15 amp
2.61 (.103")
MAX
6.35 (.25")
tape
Packaging
Part Numbering System
0251 xxxx N R T1 L
Series
251 = Standard type
253 = Military type
Current Rating
Refer to Amp Code column of
Electrical Specifications Table
Quantity
N = 5000
P = 2000
M = 1000
H = 100
Type of Packaging
R = Reel
A = Ammo Pack
X = Loose Pack
Lead Length
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**
Option Codes
L = RoHS + HF
Packaging Option
5
NN

5BQF
BOE
3FFM
5
NN
h
5BQF
BOE
3FFM
Packaging Specification
EIA 296
EIA 296
Quantity &
Packaging Code






1MFBTF
SFGFS
UP
BWBJMBCMF
RVBOUJUJFT

above in "Part Numbering System”
5IF
EFGBVMU
MFBE
MFOHUI
GPS
CPUI
BNNP
QBDL
BOE
MPPTF
QBDL
JT
5
GPS

BOE
JT
5
GPS

/PUFT









5
EJNFOTJPO
JT
EFmOFE
BT
UIF
MFOHUI
PG
UIF
DPNQPOFOU
CFUXFFO
UIF
UXP
UBQFT
5IF
GVMM
DPNQPOFOU
MFOHUI
JT
NN
  T1 length is for 251 series only.


5
EJNFOTJPO
JT
EFmOFE
BT
UIF
MFOHUI
PG
UIF
DPNQPOFOU
CFUXFFO
UIF
UXP
UBQFT
5IF
GVMM
DPNQPOFOU
MFOHUI
JT
NN
w 
T3 length is for 253 series only.
251/253 Series
© 2012 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/251.html
or /253.html for current information.