© 2012 Littelfuse, Inc.

Specifications are subject to change without notice.

Axial Lead & Cartridge Fuses

251/253 Series

Please refer to www.littelfuse.com/series/251.html

or /253.html for current information.

Materials

Body:

Solderability

Lead Pull Force

Fuses To MIL SPEC

QPL for MIL-PRF-23419. To order, change

251 to 253

Product Characteristics

Operating Temperature

Shock

Condition I (100 G’s peak for 6

msecs.)

Vibration

Moisture Resistance

Resistance to Soldering

Heat

and up to 260ºC, maximum

Flammability Rating

UL 94V–0

Dimensions

Packaging

Part Numbering System

Packaging Option

Packaging Specification

Quantity &

Packaging Code

EIA 296

above in "Part Numbering System”

EIA 296

0251 xxxx N R T1 L

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

= RoHS + HF

T1 length is for 251 series only.

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 (RoHS Version) Markings

(T3 lead length)

73.0 (2.874")**

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 (RoHS and 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 (RoHS Version) Markings

(T1 lead length)

F

F

F