Littelfuse 431 User Manual
10
SURFACE MOUNT
FUSES
Thin-Film Surface Mount
369
Surface Mount Fuses
www.littelfuse.com
0603 Very Fast-Acting Fuse 431 Series
Reference Dimensions:
®
®
OBSOLETE
• For new designs please use the 434 or 467 Series products.
ELECTRICAL CHARACTERISTICS:
% of Ampere Opening
Rating Time at 25°C
100% 4 hours, Minimum
200% 5 seconds, Maximum
300% 0.2 seconds, Maximum
AGENCY APPROVALS: Recognized under the Components
Program of Underwriters Laboratories and Certified by CSA.
AGENCY FILE NUMBERS: UL E10480, CSA LR 29862.
INTERRUPTING RATINGS:
.25–1A 50 amperes at 32 VAC/VDC
1–5A 35 amperes at 32 VAC/VDC
ENVIRONMENTAL SPECIFICATIONS:
Operating Temperature:
–55°C to 90°C. Consult temperature
rerating chart on page 4. For operation above 90°C contact Littelfuse.
Vibration: Withstands 10-55 HZ per MIL-STD-202F, Method 201A
and 10-2000 HZ at 20 G’s per MIL-STD-202F, Method 204D, Condition D.
Insulation Resistance (After Opening):
Greater than 500,000 ohms.
Resistance To Soldering Heat: Withstands 60 seconds above
200°C up to 260°C, maximum.
Thermal Shock: Withstands 5 cycles of –50°C to 125°C.
PHYSICAL SPECIFICATIONS:
Materials: Body:
Epoxy Substrate
Terminations: Copper/Nickel/Tin-Lead (95/5)
Cover Coat: Conformal Coating
Soldering Parameters:
Reflow Solder— 260°C, 30 seconds maximum
PACKAGING SPECIFICATIONS: 8mm Tape and Reel per
EIA-RS481-1 (IEC 286, part 3); 5,000 per reel, add packaging suffix, NR.
PATENTED
ORDERING INFORMATION:
For New Designs Use 434 or 467 Series.
Nominal
Catalog Ampere Voltage Resistance Melting I2t
Number Rating Rating Cold Ohm
1
(A2Sec.)
431.250 0.25 32 0.375 0.0030
431.375 0.375 32 0.265 0.0053
431.500 0.5 32 0.193 0.0087
431.750 0.75 32 0.114 0.0171
431 001 1 32 0.072 0.0210
431 01.5 1.5 32 0.048 0.0526
431 002 2 32 0.036 0.104
431 02.5 2.5 32 0.028 0.175
431 003 3 32 0.023 0.198
431 03.5 3.5 32 0.019 0.265
431 004 4 32 0.017 0.352
431 005 5 32 0.013 1.600
1
Measured at 10% of rated current, 25°C.
Average Time Current Curves
2.54
(.100")
1.02 (.040")
.76 (.030")
1.09 (.043")
REFLOW SOLDER
100
10
1
TIME IN SECONDS
0.1
0.01
.25A
1.60 (.063")
R .20 (.008")
.36 (.014")
2A
1.5A
1A
2.5A3A4A
.75A
.5A
.375A
.79
(.031")
1.04
(.041")
.43 (.017") REF.
5A
3.5A
.46 (.018")
0.001
0.1
1
CURRENT IN AMPERES
10 100
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