Littelfuse 455 User Manual

376

Surface Mount Fuses

www.littelfuse.com

Subminiature Surface Mount

NANO2®UMF Fast-Acting Fuse 455 Series

• The Nano2UMF Fuse is a very small, square surface mount fuse design.

• Designed to International (IEC) Standards for use globally.

• Meets IEC 60127-4 UMF specifications for Fast-Acting Fuses

• RoHS Compliant version now available, use ordering suffix ‘L’
(see example on data sheet).

ELECTRICAL CHARACTERISTICS:

% of Ampere Opening

Rating Time

125% 1 hour, Minimum
200% 2 minutes, Maximum

1000% 0.001 sec, Min; .01 sec Max

AGENCY APPROVALS: Listed to IEC 60127-4, Universal Modular Fuse-

Links (UMF), 125V.

AGENCY FILE NUMBERS: UL E184655.
INTERRUPTING RATINGS: 50 amperes at 125 VAC/VDC

ENVIRONMENTAL SPECIFICATIONS:
Operating Temperature:

–55°C to 125°C.

Shock: MIL-STD-202, Method 213, Test Condition I

(100 G’s peak for 6 milliseconds).

Vibration: MIL-STD-202, Method 201 (10–55 Hz).
Salt Spray: MIL-STD-202, Method 101, Test Condition B.
Insulation Resistance (After Opening): MIL-STD-202, Method

302, Test Condition A, (10,000 ohms minimum).

Resistance to Soldering Heat: MIL-STD-202,

Method 210, Test Condition B (10 sec. at 260°C).

Thermal Shock: MIL-STD-202, Method 107,

Test Condition B (–65 to 125°C).

Moisture Resistance: MIL-STD-202, Method 106, High Humidity (90-

98 RH), Heat (65°C).

PHYSICAL SPECIFICATIONS:
Materials:

Body: Ceramic
Terminations:Tin-Lead Alloy
RoHS Compliant Ter minations: Gold over Nickel Plated Caps

.

Soldering Parameters:

Wave Solder — 260°C, 10 seconds maximum
Reflow Solder — 260°C, 30 seconds maximum

Solderability: MIL-STD-202, Method 208.
PACKAGING SPECIFICATIONS: 12mm Tape and Reel per

EIA-RS481-1 (IEC 286, part3); 1,000 pieces per reel, add packaging
suffix, MR; 5,000 per reel, add packaging suffix NR.

Options: For RoHS Compliant devices add the letter ‘L’ to end of packag­ing suffix. Example: 0455001.NRL (RoHS Compliant 1A, 5,000 per reel).

PATENTED
ORDERING INFORMATION:

Average Time Current Curves

F

1 A

2.69

(.106")

2.69

(.106")

1.45

(.057")

6.10

(.240")

Nominal Nominal
Catalog Ampere Voltage Cold Resistance Melting I2t
Number Rating Rating (Ohms)

1

(A2sec)

0455.400 0.4 125 0.420 0.0795

0455.500 0.5 125 0.305 0.143
0455 001. 1.0 125 0.078 0.645
0455 01.6 1.6 125 0.0532 1.060

1

Measured at 10% of rated current, 25°C.

6.86

(.270")

3.15

(.124")

2.95

(.116")

1.96

(.077")

Recommended pad layout

RoHS

.5A1A1.6A

100

10

1

TIME IN SECONDS

0.1

0.01

0.001

0.05 0.1 1 10 100 1000

.4A

CURRENT IN AMPERES