Littelfuse 443 User Manual

443 Series Fuse

Surface Mount Fuses

NANO

2®

> 250V > Time Lag > 443 Series

Description

The 250V Nano2 Fuse is a small square surface mount
fuse that is designed to enable compliance with the RoHS
directive. This product is fully compatible with lead-free
solder alloy and higher temperature profiles associated
with lead-free assembly.

Features

• 250VACvoltagerating

• Time-Lag

• Available0.50A–5.00A

• RoHSCompliant

• Fullycompatiblewith

lead-free solder alloys
and higher temperature
profiles associated with
lead-free assembly

Agency Approvals

Applications

AGENCY AGENCY FILE NUMBER AMPERE RANGE

E10480 0.500A - 5.00A

Electrical Characteristics for Series

% of Ampere

Rating

100% 4 hours, Minimum

250% 120 seconds, Maximum

Opening Time

• AC/DCpoweradaptor

• Telecomequipment

system power

• Portablesystembuilt-in

AC/DC converter

Additional Information

Datasheet

Resources

• HighvoltageDC/DC

converter

• LightingSystem

• LEDLighting

Electrical Specifications by Item

Ampere

Rating

(A)

0.50 .500 250

0.75 .750 250 0.275 1.0 0 285 x
1 0 01. 250 0.180 10.17 234 x

1.50 01. 5 250 0.100 14.72 196 x
2 002. 250 0.052 18.06 154 x

2.50 02.5 250 0.035 18.13 139 x
3 003. 250 0.028 51.44 113 x

3.50 03.5 250 0.019 53.14 98 x
4 004. 250 0.016 70.56 81 x
5 005. 250 0.0115 127.79 80

Notes:

1. Cold resistance measured at less than 10% of rated current at 23°C.

2. Agency Approval Table Key: X=Approved or Certified, P=Pending and Blank=Not Approved

3. Have special electrical characteristic needs? Contact Littelfuse to learn more about application specific options.

Amp Code

Max

Voltage

Rating

(V)

Interrupting

Rating

50A @250VAC

Nominal Cold

Resistance

(Ohms)

0.600 1.61 448

Nominal

Melting

2

t (A2sec)

I

Nominal

Voltage Drop

(mV)

Samples

Agency

Approvals

x

x

Specifications are subject to change without notice.

© 2013 Littelfuse, Inc.

Revised: 12/19/13

Surface Mount Fuses

CURRENT IN AMPS

NANO2® > 250V > Time Lag > 443 Series

Temperature Rerating Curve

Note:

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

Average Time Current Curves

0.50 A

0.75 A

1.00 A

1.50 A

2.00 A

2.50 A

3.00 A

3.50 A

4.00 A

5.00 A

100

10

1

TIME IN SECONDS

0.1

0.01

0.001

0.1 110100 1000

Soldering Parameters

Reflow Condition Pb – Free assembly

- Temperature Min (T

Pre Heat

- Temperature Max (T

- Time (Min to Max) (ts) 60 – 120 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 – 90 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 Parameters

) 150°C

s(min)

) 200°C

s(max)

5°C/second max.

+0/–5

°C

20 – 40 seconds

) 8 minutes max.

P

260°C Peak
Temperature,
3 seconds max.

Temperature

T

T

T

T

S(max)

S(min)

25

P

L

time to peak temperature

(t 25ºC to peak)

Preheat

t

S

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