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Surface Mount Fuses
Subminiature Surface Mount
NANO
2® Slo-Blo
®
Fuse 452/454 Series
®
®
The NANO
2
Slo-Blo fuse has enhanced inrush withstand characteristics
over the NANO
2
Fast-Acting fuse. The unique time delay feature of this
fuse design helps solve the problem of nuisance “opening” by accommo-
dating inrush currents that normally cause a fast-acting fuse to open.
ELECTRICAL CHARACTERISTICS:
% of Ampere
Rating
100%
200%
300%
800%
Opening
Time
4 hours,
Minimum
1 second,
Min.;
60 seconds,
Max.
0.2 seconds,
Min.;
3 seconds,
Max.
0.02 seconds,
Min.;
0.1 seconds,
Max.
6.86
(.270")
3.15
(.124")
2.95
1.96 (.116")
(.077")
Recommended pad layout
1.45
(.057")
6.10
(.240")
F
AGENCY APPROVALS:
Recognized under the Components Program
of Underwriters Laboratories and Certified by CSA.
AGENCY FILE NUMBERS:
UL E10480, CSA LR 29862.
INTERRUPTING RATINGS:
50 amperes at 125 VAC/VDC
T
1A
2.69
(.106")
2.69
(.106")
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, .06 in. total excursion).
Salt Spray:
MIL-STD-202, Method 101, Test Condition B (48 hrs.).
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,
(3 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).
Average Time Current Curves
3/8A
1/2A
3/4A
1A
1 1/2A
2A
2 1/2A
3A
3 1/2A
4A
5A
7
SURFACE MOUNT
FUSES
1000
PHYSICAL SPECIFICATIONS:
Materials:
Body: Ceramic
Terminations: Tin-Lead Alloy or Silver
Plated Brass Caps.
100
Soldering Parameters:
TIME IN SECONDS
Wave Solder — 260°C, 3 seconds maximum
Reflow Solder — 230°C, 30 seconds maximum
Solderability:
MIL-STD-202, Method 208.
PACKAGING SPECIFICATIONS:
12mm Tape and Reel per EIA-
RS481-1 (IEC 286, part 3); 1,000 per reel; 5,000 piece reel also available.
Marking:
The 452/454 series Slo-Blo fuse marking includes the letter
“T” to designate time delay characteristics.
10
PATENTED
ORDERING INFORMATION:
Tin-Lead
Plated
Catalog #
R452.375
R452.500
R452.750
R452
001.
R452
01.5
R452
002.
R452
02.5
R452
003.
R452
03.5
R452
004.
R452
005.
Silver
Plated Ampere
Catalog # Rating
0454.375
3/8
0454.500
1/2
0454.750
3/4
0454
001.
1
0454
01.5
1
1
/
2
0454
002.
2
0454
02.5
2
1
/
2
0454
003.
3
0454
03.5
3
1
/
2
0454
004.
4
0454
005.
5
Nominal
Nominal
Resistance Melting I
2
t
Cold Ohms
A
2
Sec.
1.20
0.101
0.700
0.240
0.360
0.904
0.225
1.98
0.0930
3.65
0.0625
8.20
0.0450
15.0
0.0340
20.16
0.0224
26.53
0.0186
34.40
0.0136
53.72
1
Voltage
Rating
125
125
125
125
125
125
125
125
125
125
125
0.1
0.01
0.1
1
10
100
CURRENT IN AMPERES
1000
Refer to pg. 271 for SMF Omni-Blok
®
Holder, Series
154
000T.
269
w w w. l i t t e l f u s e . c o m
LITTELFUSE [ LITTELFUSE ]
