Littelfuse 456 User Manual

456 Series Fuse

Surface Mount Fuses

NANO2® > 456 Series

Description

The High Current NANO
mount fuse that is designed to support higher current
requirements of various applications.

2®

Fuse is a small square surface

PS

E

40A

20A, 25A, 30A

Agency Approvals

AGENCY AGENCY FILE NUMBER AMPERE RATING

E10480 20A, 25A, 30A, 40A

PS

E

NBK030308-JP1021 20A, 25A, 30A

Electrical Characteristics

% of

Ampere Rating

100% 4 hours, Minimum
200% 60 seconds, Maximum

Opening Time

Features

• Surfacemounthigh

current fuse

• Fullycompatiblewith

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

Applications

• Voltageregulatormodule

for PC server

• Coolingfansystemfor

PC server

• Storagesystempower

Additional Information

Datasheet

Resources

• RoHScompliantand

Halogen Free

• Availableinratingsof20

to 40 Amperes

• Basestationpower

supply

Samples

Electrical Specifications

Ampere

Rating

(A)

20 020. 125

25 025. 125

30 030. 125

40 040. 72

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.

3. I2t values stated for 10 msec opening time.

Amp Code

Max

Voltage

Rating

(V)

Interrupting Rating

100A @125VAC

300A @ 65VAC
300A @ 100VDC
1000A @ 32VDC

500A @ 72VDC
100A @ 125VAC

300A @ 65VAC

500A @ 72VDC

1000A @ 32VDC

100A @ 125VAC

300A @ 65VAC
1000A @ 32VDC

500A @ 72VDC

180A @ 72VDC

600A @ 60VDC

Nominal

Cold Resistance

(Ohms)

0.00230 18 64.7 x x

0.00192 45 68.38 x x

0.00132 81 69.9 x x

0.00105 454 55 x

Nominal

Melting

2

t (A2 Sec.)

I

Nom Voltage

Drop
(mV)

Specifications are subject to change without notice.

Agency Approvals

PS

E

© 2013 Littelfuse, Inc.

Revised: 12/19/13

Surface Mount Fuses

NANO2® > 456 Series

60

40

20

0 0

PERCENT OF UPRATING

Average Time Current CurvesTemperature Rerating Curve

40A

30A

20A

25A

100

20

40

60

120°C

140°C100°C80°C60°C40°C20°C0°C-20°C-40°C-60°C

248°F212°F176°F140°F104°F68°F32°F-4°F-40°F-76°F

AMBIENT TEMPERATURE

264°F

Soldering Parameters – Reflow 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
(TL) to peak

T

to TL - Ramp-up Rate 5°C/second max.

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 (tp)

Ramp-down Rate 5°C/second max.

Time 25°C to peak Temperature (TP) 8 minutes max.

Do not exceed 260°C

) 150°C

s(min)

) 200°C

s(max)

5°C/second max.

+0/–5

°C

20 – 40 seconds

PERCENT OF DOWNUPRATING

10

TIME IN SECONDS

1

0.1

0.01
1 10 100 1000

CURRENT IN AMPS

t

P

t

L

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

Critical Zone

Ramp-down

Time

T

to T

L

P

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