Littelfuse 468 User Manual

468 Series Fuse

Surface Mount Fuses

Thin Film > 1206 Size > Slo-Blo® > 468 Series

Description

The 468 Series Time-Lag (Slo-Blo®) SMF 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.

This series is 100% lead-free and meets the requirements
of the RoHS directive. New Halogen-Free 468 Series
fuses are available–to order use the “HF” suffix. See Part
Numbering section for additional information.

Agency Approvals

AGENCY AGENCY FILE NUMBER AMPERE RANGE

E10480 500MA - 3A

LR29862 500MA - 3A

Electrical Characteristics for Series

% of Ampere

Rating

100% 4 hours, Minimum

200% 1 sec., Min.; 120 sec., Max.

300% 0.05 sec., Min.; 1.5 sec., Max

800% 0.0015 sec., Min.; .05 sec., Max.

Opening Time at 25

O

C

Additional Information

Datasheet

Resources

Samples

Features

• Complieswith

electronic industry
environmental standards
for lead reduction.

• Productiscompatible

with lead-free solders
and higher temperature

• Packageisvisually

distinct from fast­acting version for easy
identification.

• Topsidemarkingallows

visual verification of
amperage rating.

profiles.

• Timedelayfeature

withstands high inrush
currents and prevents
nuisance openings.

Applications

Secondary protection for space constrained applications:

• Cellphones

• Batterypacks

• DVDplayers

• Harddiskdrives.

• Digitalcameras

Electrical Specifications by Item

Ampere

Rating

(A)

0.50 .500 63

1. 0 0 00 1. 63 0.08250 0.1270 94.70 0.0947 x x

1.50 01. 5 63 0.04750 0.2880 82.32 0.1235 x x

2.00 002. 63 35 amperes @63 VAC

2.50 02.5 63 0.02240 1.0110 73.92 0.1848 x x

3.00 003. 32 50 amperes @32

1. Measured at 10% of rated current, 25˚C.

2. Measured at rated voltage.

Amp

Code

Max

Voltage

Rating

(V)

Interrupting

Rating

50 amperes @63

VAC/VDC

50 amperes @63

VDC

VAC/VDC

Nominal Cold

Resistance

(Ohms)

0.27000 0.0310 156.77 0.0784 x x

0.03240 0.5060 77.27 0.1545 x x

0.01950 1.2700 72.95 0.2189 x x

Nominal

Melting

2

t (A2sec)

I

Nom

Voltage

Drop

(mV)

Nom

Power

Dissipation

(W)

Specifications are subject to change without notice.

Approvals

© 2013 Littelfuse, Inc.

Agency

Revised: 12/19/13

Surface Mount Fuses

0

Current in Amperes

Time in Seconds

5A

Thin Film > 1206 Size > Slo-Blo® > 468 Series

Average Time Current CurvesTemperature Rerating Curve

Note:

1. Derating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.

Example:
For continuous operation at 70 degrees celsius, the fuse should be deratedas follows:

I = (0.75)(0.80)I

2. The temperature derating curve represents the nominal conditions. For questions
about temperature derating curve, please consult Littelfuse technical support
for assistance.

= (0.60)I

RAT

RAT

0.01

0.001

1A

100

10

1

0.1

.5A

3A

2.

2A

1.5A

010110

Soldering Parameters

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 (TL) (Liquidus) 217°C

- Temperature (tL) 60 – 150 seconds

Peak Temperature (TP) 260

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

Wave Soldering 260°C, 10 seconds max.

) 150°C

s(min)

) 200°C

s(max)

5°C/second max

+0/- 5

20 – 40 seconds

) 8 minutes Max.

P

°C

T

Temperature

S(max)

T

S(min)

T

P

T

L

25

time to peak temperature

Preheat

t

S

(t 25ºC to peak)

Ramp-up

t

P

Critical Zone

T

to T

L

P

t

L

Ramp-down

Time

© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13