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© 2009 Littelfuse, Inc.

Specifications are subject to change without notice.

Surface Mount Fuses

Please refer to www.littelfuse.com/series/437.html for current information.

437 Series

Ceramic Fuse > 437 Series

437 Series – 1206 Fast-Acting Fuse

Description

This 100% Lead-free, RoHS compliant and Halogen-free

fuse series has been designed specifically to provide over

current protection to circuits that see high working ambient

temperatures (up to 150ºC).

The general design ensures excellent temperature stability

and performance reliability.

In addition to this, the high I²t values typical of the

Littelfuse Ceramic Fuse family ensure high inrush current

withstand capability.

Agency Approvals

AGENCY

AGENCY FILE NUMBER

AMPERE RANGE

E10480

0.250A ~ 8A

LR29862

0.250A ~ 8A

Features

Electrical Characteristics for Series

from -55ºC to +150ºC

RoHS compliant

and lead-free reflow /

wave soldering

% of Ampere

Rating

Ampere Rating

OpeningTime at 25ºC

100%

250mA - 8A

4 hours, Minimum

250%

750mA - 8A

5 seconds, Maximum

350%

250mA -500mA

5 seconds, Maximum

350%

750mA - 8A

1 second, 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

250mA

.250

125

50 A @ 125 V AC/DC

2.290

0.003

0.78

0.195

x

x

375mA

.375

125

1.330

0.010

0.60

0.225

x

x

500mA

.500

63

50 A @ 63 V AC/DC

0.908

0.018

0.52

0.260

x

x

750mA

.750

63

0.665

0.064

0.45

0.335

x

x

1A

001.

63

0.360

0.100

0.41

0.415

x

x

1.25A

1.25

63

0.318

0.256

0.40

0.496

x

x

1.5A

01.5

63

0.209

0.324

0.39

0.579

x

x

1.75A

1.75

63

0.0703

0.075

0.27

0.474

x

x

2A

002.

63

0.058

0.144

0.17

0.345

x

x

2.5A

02.5

32

50 A @ 32 V AC/DC

0.043

0.225

0.14

0.363

x

x

3A

003.

32

0.033

0.400

0.15

0.462

x

x

3.5A

03.5

32

0.027

0.576

0.16

0.560

x

x

4A

004.

32

0.022

1.024

0.16

0.618

x

x

5A

005.

32

0.016

1.936

0.09

0.484

x

x

7A

007.

32

0.010

4.900

0.11

0.760

x

x

8A

008.

32

0.0084

6.400

0.067

0.539

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 msecs. opening time.

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

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

Rerating Curve”for additional rerating information.

Devices designed to be mounted with marking code facing up.

Revised: August 3, 2009