251-253 Datasheet, PDF (1/1 Pages) Littelfuse – Axial Lead and Cartridge Fuses - Subminiature

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PICO II ®
Very Fast-Acting Fuse 251/253
®
®
QPL
The PICO^® II very fast-acting fuse is designed to meet an extensive array
of performance characteristics in a space-saving subminiature package.
ELECTRICAL CHARACTERISTICS:
% of Ampere
Rating
Ampere
Rating
Opening
Time
100%
1/16 –15
4 hours, Minimum
1/16 –7
1 second, Maximum
200%
10
3 seconds, Maximum
12 –15
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.
INTERRUPTING RATINGS:
300 amperes at rated voltage VDC.
50 amperes at rated voltage VAC.
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.
PHYSICAL SPECIFICATIONS:
Materials: Encapsulated, Epoxy-Coated Body; Solder Coated Copper
Wire Leads.
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).
PACKAGING SPECIFICATIONS: Tape and Reel per EIA-296; T1:
2.062" (52.4mm) taped spacing; 5,000 per reel.
Option: Radial Lead Version; 0.4" lead spacing; to order, change
251 to 252.
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
1¹/2
2
2¹/2
3
3¹/2
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 I²t
A² 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
38.1
(1.5")
0.64 (.025")
DIA.
7.11 (.280")
REF.
L^F 1 A
38.1
(1.5")
EPOXY COATING
2.41 (.095")
DIA. REF.
NOTE: .025" diameter for /¹ 16 –10A, .032" diameter for 12 –15A.
Average Time Current Curves
100
10
1
0.1
0.01
0.001
0.05 0.1
1
10
100
CURRENT IN AMPERES
1000
Note: Higher Ampere Ratings Available.
Contact Technical Assistance for Details
280
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