Littelfuse 433 User Manual

Surface Mount Fuses

®

Thin Film > 1206 Size > Very Fast Acting > 433 Series

433 Series Fuse

Agency Approvals

Agency Agency File Number Ampere Range

®

Electrical Characteristics for Series

% of Ampere

E10480 125mA - 5A

LR29862 125mA - 5A

®

Rating

100% 4 hours, Minimum

200% 5 sec., Maximum

300% 0.2 sec., Maximum

Opening Time at 25

®

®

Description

The 433 series fast-acting surface mount fuse series
is a small (1206 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 466 series thin film fuse. For new designs of
7 amp please refer to Littelfuse 429 series thin film fuse.

Features

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fuse is an extremely
small, low profile design
(1206 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
application.

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electrical specification are
identical to the popular
429 Series specifications.

Applications

O

C

Secondary protection for space constrained applications
such as:

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Electrical Specifications by Item

Ampere

Rating

(A)

0.125 .125 125

0.200 .200 125 0.93800 0.00055 x x

0.250 .250 125 0.62500 0.00100 x x

0.375 .375 125 0.37500 0.00280 x x

0.50 .500 63

0.60 .600 63 0.21000 0.01310 x x

0.75 .750 63 0.13700 0.01700 x x

0.80 .800 63 0.12250 0.03050 x x

1.00 001. 63 0.09950 0.03500 x x

1.25 1.25 63 0.07475 0.06500 x x

1.50 01.5 63 0.06250 0.12500 x x

1.75 1.75 63 0.05000 0.15000 x x

2.00 02.0 63 0.03975 0.23000 x x

2.50 02.5 32

3.00 03.0 32 0.02625 0.70000 x x

4.00 04.0 24

5.00 05.0 24 0.01100 1.6000 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 @125 V AC/DC

50A @63 V AC/DC

50A @32 V AC/DC

50A @24 V AC/DC

Nominal Cold

Resistance

(Ohms)

3.45000 0.00040 x x

0.24050 0.00600 x x

0.03065 0.50000 x x

0.01400 1.0240 x x

7

Revision: February 13, 2008

Nominal

Melting

2

t (A2sec)

I

Agency Approvals

®

433 Series

Surface Mount Fuses

0

Thin Film > 1206 Size > Very Fast Acting > 433 Series

Temperature Rerating Curve

Average Time Current Curves

1.25A

1A

.8A

.75A

.6A

.5A

.375A

.25A

.200A

.125A

100

10

1

TIME IN SECONDS

0.1

0.01

0.001

0.1

1

CURRENT IN AMPERES

1.5A

1.75A

2A

2.5A

3A

5A

4A

10 10

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 (t

L

) 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

433 Series

8

Revision: February 13, 2008

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

Specifications are subject to change without notice.

©2008 Littelfuse, Inc.