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© 2009 Littelfuse, Inc.

Specifications are subject to change without notice.

Surface Mount Fuses

Please refer to www.littelfuse.com/series/440.html for current information.

440 Series

Ceramic Fuse > 440 Series

Description

The 440 Series is a 100% Lead-free, RoHS compliant and

Halogen-free fuse series designed specifically to provide

over-current protection to circuits that operate under high

working ambient temperatures up to 150ºC and high inrush

currents.

The general design ensures excellent temperature stability

and performance reliability.

inrush current withstand capability to avoid nuisance fuse

open.

Agency Approvals

Agency

Agency File number

Ampere rAnge

e10480

.25A - 8A

lr 29862

.25A - 8A

Features

Electrical Characteristics for Series

• OperatingTemperature

from -55ºC to +150ºC

• 100%Lead-free,RoHS

compliant and Halogen-

free

• Suitableforbothleaded

and lead-free reflow /

wave soldering

% of Ampere

rating

Ampere rating

OpeningTime at 25ºc

100%

0.25A - 8A

4 hours, Minimum

350%

0.25A - 8A

5 secs., Maximum

Applications

Ampere

rating

(A)

Amp

code

max.

Voltage

rating (V)

interrupting rating

nominal

resistance

nominal

nominal Voltage

Drop At rated

nominal power

Dissipation At

rated current (W)

Agency Approvals

0.25

.250

125

50 A @ 125 V AC/DC

2.140

0.00649

0.5260

0.132

x

X

0.375

.375

125

1.216

0.01455

0.4993

0.187

x

X

0.5

.500

63

50 A @ 63 V AC/DC

0.8140

0.02642

0.4831

0.242

x

X

0.75

.750

63

50 A @ 63 V AC/DC

0.4624

0.09312

0.3983

0.299

x

X

1

001.

50

50 A @ 50 V DC

50 A @ 50 V AC

0.3096

0.21054

0.3457

0.346

x

X

1.25

1.25

50

0.2268

0.40200

0.3240

0.405

x

X

1.5

01.5

50

0.1759

0.50652

0.3215

0.482

x

X

1.75

1.75

32

50 A @ 32 V AC/DC

0.04518

0.3312

0.0777

0.136

x

X

2

002.

32

0.03802

0.4326

0.0792

0.158

x

X

2.5

02.5

32

0.02850

0.8191

0.0747

0.187

x

X

3

003.

32

0.02252

1.232

0.0742

0.223

x

X

3.5

03.5

32

0.01845

1.789

0.0757

0.265

x

X

4

004.

32

0.01553

2.601

0.0709

0.284

x

X

5

005.

32

0.01164

4.761

0.0654

0.327

x

X

7

007.

32

0.00753

8.464

0.0696

0.487

x

X

8

008.

32

0.00634

12.95

0.0655

0.524

x

X

Electrical Specifications by Item

Notes:

1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting

Rating tested at rated voltage with time constant < 0.8 msec.

2. Nominal Resistance measured with < 10% rated current.

3. Nominal Melting I²t measured at 1 msec. opening time.

4. Nominal Voltage Drop measured at rated current after temperature has stabilized.

• AutomotiveElectronics

• LCDDisplays

• Servers

• NotebookComputers

• Printers

• Scanners

• DataModems

• HardDiskDrives

Devices designed to carry rated current for 4 hours minimum. It is recommended that

devices be operated continuously at no more than 80% rated current. See “Temperature

Derating Curve”for additional derating information.

Devices designed to be mounted with marking code facing up.

Revised: June 23, 2011