Littelfuse 253 Series PICO II Manuel d'utilisateur télécharger pdf (Page 4)

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

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 = 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)

1 A

73.0 (2.874")**

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

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)

1 2 3 4

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Littelfuse 253 Series PICO II Manuel d'utilisateur Page 4

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