Axial Lead and Cartridge Fuses
Subminiature
PICO
®
II
Very Fast-Acting Fuse 251/253
The PICO
®
II very fast-acting fuse is designed to meet an extensive array
of performance characteristics in a space-saving subminiature package.
®
®
QPL
ELECTRICAL CHARACTERISTICS:
% of Ampere
Rating
100%
200%
Ampere
Rating
1/16 –15
1/16 –7
10
12 –15
Opening
Time
4 hours,
Minimum
1 second,
Maximum
3 seconds,
Maximum
10 seconds,
Maximum
AGENCY APPROVALS:
Recognized under the Components
Program of Underwriters Laboratories and Certified by CSA.
Approved by METI from 1 through 5 amperes.
AGENCY FILE NUMBERS:
UL E10480, CSA LR 29862.
REFERENCE TO MIL SPEC:
Available in FM10 on QPL for
MIL-PRF-23419. To order, change 251 to 253 as shown below.
38.1
(1.5")
7.11 (.280")
REF.
38.1
(1.5")
2.41 (.095")
DIA. REF.
INTERRUPTING RATINGS:
300 amperes at rated voltage VDC.
50 amperes at rated voltage VAC.
0.64 (.025")
DIA.
F
L
1A
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);
Method 204, Test Condition C (55–2000 Hz at 10 G’s Peak).
Moisture Resistance:
MIL-STD-202, Method 106.
EPOXY COATING
NOTE: .025" diameter for
1
/
16
–10A, .032" diameter for 12 –15A.
Average Time Current Curves
1/4A
3/8A
1/2A
3/4A
1A
1 1/2A
2A
2 1/2A
3A
3 1/2A
4A
5A
7A
10A
12A
15A
1
10
100
CURRENT IN AMPERES
1/16A
1/8A
PHYSICAL SPECIFICATIONS:
Materials:
Encapsulated, Epoxy-Coated Body; Solder Coated Copper
Wire Leads.
100
Flammability Rating:
UL 94V0
Soldering Parameters:
Wave Solder — 260°C, 10 seconds maximum.
Solderability:
MIL-STD-202, Method 208.
Lead Pull Force:
MIL-STD-202, Method 211, Test Condition A (will
withstand a 7 lb. axial pull test).
2.062" (52.4mm) taped spacing; 5,000 per reel.
Option:
Radial Lead Version; 0.4" lead spacing; to order, change
251
to
252.
10
TIME IN SECONDS
PACKAGING SPECIFICATIONS:
Tape and Reel per EIA-296; T1:
1
PATENTED
ORDERING INFORMATION:
Std. Type
Catalog
Number
R251.062
R251.125
R251.250
R251.375
R251.500
R251.750
R251
001
R251
01.5
R251
002
R251
02.5
R251
003
R251
03.5
R251
004
R251
005
R251
007
R251
010
R251
012
R251
015
Mil. Type
Catalog
Number
R253.062
R253.125
R253.250
R253.375
R253.500
R253.750
R253
001
R253
01.5
R253
002
R253
003
R253
004
R253
005
R253
007
R253
010
R253
015
Ampere
Rating
1/16
1/8
1/4
3/8
1/2
3/4
1
1
1
/
2
2
2
1
/
2
3
3
1
/
2
4
5
7
10
12
15
Voltage
Rating
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
32
32
Nominal
Resistance
Cold Ohms
7.0
1.70
0.665
0.395
0.280
0.175
0.128
0.0823
0.0473
0.0360
0.0290
0.0240
0.0204
0.0155
0.0105
0.00705
0.0055
0.00446
Nominal
Melting I
2
t
A
2
Sec.
0.000113
0.00174
0.0116
0.0296
0.0598
0.153
0.256
0.587
0.405
0.721
1.19
1.58
2.45
4.14
10.4
25.5
45.2
68.8
0.1
0.01
0.001
0.05 0.1
1000
Note: Higher Ampere Ratings Available.
Contact Technical Assistance for Details
280
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