R251.750 datasheet(1/1 Pages) LITTELFUSE

Part #	R251.750

Description	Axial Lead and Cartridge Fuses - Subminiature

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Manufacturer	LITTELFUSE [Littelfuse]

Direct Link	http://www.littelfuse.com

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Subminiature

Axial Lead and Cartridge Fuses

PICO® II Very Fast-Acting Fuse 251/253

280

www .littelfuse .com

The PICO® II very fast-acting fuse is designed to meet an extensive array

of performance characteristics in a space-saving subminiature package.

ELECTRICAL CHARACTERISTICS:

% of Ampere

Ampere

Opening

Rating

Time

100%

1/16 –15

4 hours, Minimum

1/16 –7

1 second, Maximum

200%

10

3 seconds, Maximum

12 –15

10 seconds, Maximum

AGENCY APPROVALS: Recognized under the Components

Program of Underwriters Laboratories and Certified by CSA.

Approved by METI from 1 through 5 amperes.

AGENCY FILE NUMBERS: UL E10480, CSA LR 29862.

REFERENCE TO MIL SPEC: Available in FM10 on QPL for

MIL-PRF-23419. To order, change 251 to 253 as shown below.

INTERRUPTING RATINGS:

300 amperes at rated voltage VDC.

50 amperes at rated voltage VAC.

ENVIRONMENTAL SPECIFICATIONS:

Operating Temperature: –55°C to 125°C.

Shock: MIL-STD-202, Method 213, Test Condition I

(100 G’s peak for 6 milliseconds).

Vibration: MIL-STD-202, Method 201 (10–55 Hz);

Method 204, Test Condition C (55–2000 Hz at 10 G’s Peak).

Moisture Resistance: MIL-STD-202, Method 106.

PHYSICAL SPECIFICATIONS:

Materials: Encapsulated, Epoxy-Coated Body; Solder Coated Copper

Wire Leads.

Flammability Rating: UL 94V0

Soldering Parameters:

Wave Solder — 260°C, 10 seconds maximum.

Solderability: MIL-STD-202, Method 208.

Lead Pull Force: MIL-STD-202, Method 211, Test Condition A (will

withstand a 7 lb. axial pull test).

PACKAGING SPECIFICATIONS: Tape and Reel per EIA-296; T1:

2.062" (52.4mm) taped spacing; 5,000 per reel.

Option: Radial Lead Version; 0.4" lead spacing; to order, change

251 to 252.

PATENTED

ORDERING INFORMATION:

100

10

1

0.1

0.01

0.001

0.05 0.1

1

10

100

1000

CURRENT IN AMPERES

Std. Type

Mil. Type

Nominal

Catalog

Ampere

Voltage

Resistance

Melting I2t

Number

Rating

Cold Ohms

A2 Sec.

R251.062

R253.062

1/16

125

7.0

0.000113

R251.125

R253.125

1/8

125

1.70

0.00174

R251.250

R253.250

1/4

125

0.665

0.0116

R251.375

R253.375

3/8

125

0.395

0.0296

R251.500

R253.500

1/2

125

0.280

0.0598

R251.750

R253.750

3/4

125

0.175

0.153

R251 001

R253 001

1

125

0.128

0.256

R251 01.5

R253 01.5

11/2

125

0.0823

0.587

R251 002

R253 002

2

125

0.0473

0.405

R251 02.5

21/2

125

0.0360

0.721

R251 003

R253 003

3

125

0.0290

1.19

R251 03.5

31/2

125

0.0240

1.58

R251 004

R253 004

4

125

0.0204

2.45

R251 005

R253 005

5

125

0.0155

4.14

R251 007

R253 007

7

125

0.0105

10.4

R251 010

R253 010

10

125

0.00705

25.5

R251 012

12

32

0.0055

45.2

R251 015

R253 015

15

32

0.00446

68.8

Average Time Current Curves

F

L 1 A

38.1

(1.5")

38.1

(1.5")

7.11 (.280")

REF.

EPOXY COATING

0.64 (.025")

DIA.

2.41 (.095")

DIA. REF.

NOTE: .025" diameter for 1/16 –10A, .032" diameter for 12 –15A.

Note: Higher Ampere Ratings Available.

Contact Technical Assistance for Details

®

QPL

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