Littelfuse 434 User Manual

Surface Mount Fuses

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®

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Thin Film > 0603 Size > Very Fast Acting > 434 Series

434 Series Fuse

Agency Approvals

Agency Agency File Number Ampere Range

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Electrical Characteristics for Series

% of Ampere

E10480 250mA - 3A

LR29862 250mA - 3A

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Rating

100% 4 hours, Minimum

200% 5 seconds, Maximum.

300% 0.2 seconds, Maximum

Opening Time at 25

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Description

The 434 series fast-acting surface mount fuse series is
an ultra small (0603 size) thin-film device designed for
secondary protection of circuits used in space constrained
applications such as hand-held portable electronic devices.

For RoHS compliant and lead-free design, please refer to
the Littelfuse 467 series thin film fuse.

Features

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fuse is an extremely
small, low profile design
(0603 chip size) utilizing
thin-film technology to
achieve precise control of
electrical characteristics.

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produces a flat surface for
improved performance in
pick-and-place operations
and an alternate solution
for height critical
applications.

Applications

Secondary protection for space constrained applications
such as:

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O

C

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t %7%QMBZFST

t )BSEEJTLESJWFT

t %JHJUBMDBNFSBT

Electrical Specifications by Item

Ampere

Rating

(A)

0.250 .250 32

0.375 .375 32 0.2650 0.0053 x x

0.500 .500 32 0.1903 0.0087 x x

0.680 .680 32 0.1250 0.0109 x x

0.750 .750 32 0.1140 0.0171 x x

1.00 001. 32 0.0720 0.0212 x x

1.25 1.25 32

1.50 01.5 32 0.0480 0.0526 x x

1.75 1.75 32 0.0390 0.0661 x x

2.00 002. 32 0.0360 0.1040 x x

2.50 02.5 32 0.0280 0.1750 x x

3.00 003. 32 0.0230 0.1980 x x

3.50 03.5 32 0.0190 0.2650 x x

4.00 004. 32 0.0170 0.3520 x x

5.00 005. 32 0.0130 1.2970 x x

1. Measured at 10% of rated current, 25ºC.

2. Measured at rated voltage.

©2008 Littelfuse, Inc.

Specifications are subject to change without notice.
Please refer to www.littelfuse.com for the most current information

Amp

Code

Max

Voltage

Rating

(V)

Interrupting

Rating

50A @32 V AC/DC

35A @32 V AC/DC

Nominal Cold

Resistance

(Ohms)

0.3750 0.0030 x x

0.0540 0.0320 x x

31

Revision: February 13, 2008

Nominal

Melting

2

t (A2sec)

I

Agency Approvals

434 Series

Surface Mount Fuses

Thin Film > 0603 Size > Very Fast Acting > 434 Series

Temperature Rerating Curve

Average Time Current Curves

1A

.75A

.5A

.375A

.25A

100

10

1

TIME IN SECONDS

0.1

0.01

0.001

0.1

.68A

1

CURRENT IN AMPERES

1.5A

3A

2.5A

2A

3.5A4A5A

10 100

Soldering Parameters - Wave Soldering

Reflow Condition Pb – Free assembly

- Temperature Min (T

Pre Heat

- Temperature Max (T

- Time (Min to Max) (ts) 60 – 180 secs

Average ramp up rate (Liquidus Temp
(T

) to peak

L

to TL - Ramp-up Rate 5°C/second max

T

S(max)

Reflow

- Temperature (T

- Temperature (tL) 60 – 150 seconds

L

Peak Temperature (TP) 250

Time within 5°C of actual peak
Temperature (t

)

p

Ramp-down Rate 5°C/second max

Time 25°C to peak Temperature (T

Do not exceed 260°C

) 150°C

s(min)

) 200°C

s(max)

5°C/second max

) (Liquidus) 217°C

+0/-5

20 – 40 seconds

) 8 minutes Max.

P

°C

434 Series

32

Revision: February 13, 2008

©2008 Littelfuse, Inc.

Please refer to www.littelfuse.com for the most current information

Specifications are subject to change without notice.