Axial Lead and Cartridge Fuses
Subminiature
RoHS QPL
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.
RoHS Compliant version now available, use ordering suffix L
(see example on data sheet).
ELECTRICAL CHARACTERISTICS:
% of Ampere Ampere Opening
Rating Rating Time
100% 1/1615 4 hours, Minimum
1/167 1 second, Maximum
200% 10 3 seconds, Maximum
1215 10 seconds, Maximum
AGENCY APPROVALS: Recognized under the Components
38.1 38.1
7.11 (.280")
Program of Underwriters Laboratories and Certified by CSA.
(1.5")
(1.5")
REF.
Approved by METI from 1 through 5 amperes.
AGENCY FILE NUMBERS: UL E10480, CSA LR 29862.
F 2.80 (0.110")
1 A
L
DIA. MAX.
REFERENCE TO MIL SPEC: Available in FM10 on QPL for
MIL-PRF-23419. To order, change 251 to 253 as shown below.
0.64 (.025")
DIA.
INTERRUPTING RATINGS:
EPOXY COATING
300 amperes at rated voltage VDC.
50 amperes at rated voltage VAC.
ENVIRONMENTAL SPECIFICATIONS:
1
NOTE: .025" diameter for /1610A, .032" diameter for 12 15A.
Operating Temperature: 55C to 125C.
Shock: MIL-STD-202, Method 213, Test Condition I
PACKAGING SPECIFICATIONS: Tape and Reel per EIA-296;
(100 Gs peak for 6 milliseconds).
T1: 2.062" (52.4mm) taped spacing; 5,000 per reel.
Vibration: MIL-STD-202, Method 201 (1055 Hz);
Options: For RoHS Compliant devices add the letter L to end of
Method 204, Test Condition C (552000 Hz at 10 Gs Peak).
packaging suffix. Example: 0251001.NRT1L (RoHS Compliant 1A,
Moisture Resistance: MIL-STD-202, Method 106.
5,000 per reel).
PHYSICAL SPECIFICATIONS:
Materials: Encapsulated, Epoxy-Coated Body; Solder Coated Copper
Average Time Current Curves
Wire Leads. RoHS Compliant Product: Pure Tin coated copper wire leads.
Flammability Rating: UL 94V0
Soldering Parameters:
100
Wave Solder 260C, 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).
PATENTED
10
ORDERING INFORMATION:
Std. Type Mil. Type Nominal Nominal
2
Catalog Catalog Ampere Voltage Resistance Melting I t
2
Number Number Rating Rating Cold Ohms A Sec.
1
0251.062 0253.062 1/16 125 7.0 0.000113
0251.125 0253.125 1/8 125 1.70 0.00174
0251.250 0253.250 1/4 125 0.665 0.0116
0251.375 0253.375 3/8 125 0.395 0.0296
0251.500 0253.500 1/2 125 0.280 0.0598
0251.750 0253.750 3/4 125 0.175 0.153
0.1
0251 001 0253 001 1 125 0.128 0.256
1
0251 1.25 1 /4 125 0.100 0.390
1
0251 01.5 0253 01.5 1 /2 125 0.0823 0.587
0251 002 0253 002 2 125 0.0473 0.405
1
0251 02.5 2 /2 125 0.0360 0.721
0251 003 0253 003 3 125 0.0290 1.19
1
0251 03.5 3 /2 125 0.0240 1.58 0.01
0251 004 0253 004 4 125 0.0204 2.45
0251 005 0253 005 5 125 0.0155 4.14
0251 007 0253 007 7 125 0.0105 10.4
0251 010 0253 010 10 125 0.00705 25.5
0251 012 12 32 0.0055 45.2
0251 015 0253 015 15 32 0.00446 68.8
0.001
Note: Higher Ampere Ratings Available. 0.05 0.1 1 10 100 1000
Contact Technical Assistance for Details
CURRENT IN AMPERES
388
www.littelfuse.com
TIME IN SECONDS
1/16A
1/8A
1/4A
3/8A
1/2A
3/4A
1A
1 1/4A
1 1/2A
2A
2 1/2A
3A
3 1/2A
4A
5A
7A
10A
12A
15A