443 Series Datasheet by Littelfuse Inc.

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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/17
Surface Mount Fuses
NANO > 250V > Slo-Blo® Fuse > 443 Series
443 Series Fuse
Features
250 VAC voltage rating
• Slo-Blo® Fuse
Available 0.50A – 5.00A
RoHS Compliant
Fully compatible with
lead-free solder alloys
and higher temperature
profiles associated with
lead-free assembly
RoHS
% of Ampere
Rating Opening Time
100% 4 hours, Minimum
250% 120 seconds, Maximum
Electrical Specifications by Item
Ampere
Rating
(A)
Amp
Code
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2sec)
Nominal
Voltage Drop
(mV)
Agency Approvals
PS
E
0.50 .500 250
50A @250VAC
0.600 1.61 448 x x x
0.75 .750 250 0.275 3.025 285 x x x
10 01. 250 0.180 10.17 234 x x x x
1.50 01. 5 250 0.100 14.72 196 x x x x
2 002. 250 0.052 18.06 154 x x x x
2.50 02.5 250 0.035 18.13 139 x x x x
3 003. 250 0.028 51.44 113 x x x x
3.50 03.5 250 0.019 53.14 98 x x x x
4 004. 250 0.016 122.5 81 x x x x
5 005. 250 0.0115 180.6 80 x x x x
Notes:
1. Cold resistance measured at less than 10% of rated current at 23°C.
2. Agency Approval Table Key: X=Approved or Certified, P=Pending and Blank=Not Approved
3. Have special electrical characteristic needs? Contact Littelfuse to learn more about application specific options.
The 250V Nano Fuse is a small square surface mount
fuse that is designed to enable compliance with the RoHS
directive. This product is fully compatible with lead-free
solder alloy and higher temperature profiles associated
with lead-free assembly.
AC/DC power adaptor
Telecom equipment
system power
Portable system built-in
AC/DC converter
Lighting System
LED Lighting
Description
Applications
Agency Approvals
Electrical Characteristics for Series
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E10480 0.500A - 5.00A
SU05024 -14004
SU05024 -14003
SU05024 -14002
0.500A - 0.750A
1.00A - 2.50A
3.00A - 5.00A
PS
E
NBK290416-JP1021 1.00A – 5.00A
R50310551 0.500A - 5.00A
Specifications are subject to change without notice. Application testing is strongly recommended.
PS
E
Additional Information
Datasheet Samples
Resources
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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/17
Surface Mount Fuses
NANO> 250V > Slo-Blo® Fuse > 443 Series
Average Time Current Curves
Reflow Condition Pb – Free assembly
Pre Heat
- Temperature Min (Ts(min))150°C
- Temperature Max (Ts(max))200°C
- Time (Min to Max) (ts)60 – 120 secs
Average ramp up rate (Liquidus Temp
(TL) to peak 5°C/second max.
TS(max) to TL - Ramp-up Rate 5°C/second max.
Reflow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL)60 – 90 seconds
Peak Temperature (TP)260+0/–5 °C
Time within 5°C of actual peak
Temperature (tp)20 – 40 seconds
Ramp-down Rate 5°C/second max.
Time 25°C to peak Temperature (TP)8 minutes max.
Do not exceed 260°C
Soldering Parameters
Temperature Re-rating Curve
0.001
0.01
0.1
1
10
10 0
0.1 110100 1000
TIME IN SECONDS
CURRENT IN AMPS
0.50 A
0.75 A
1.00 A
1.50 A
2.00 A
2.50 A
3.00 A
3.50 A
4.00 A
5.00 A
Note:
1. Rerating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
Wave Soldering Parameters
260°C Peak
Temperature,
3 seconds max.
Time
Temperature
TP
TL
TS(max)
TS(min)
25
tP
tL
tS
time to peak temperature
(t 25ºC to peak)
Ramp-down
Ramp-up
Preheat
Critical Zone
TL to TP
0443 .§o_on R ‘R a}? HI 4
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/17
Surface Mount Fuses
NANO > 250V > Slo-Blo® Fuse > 443 Series
Materials Body: Ceramic
Cap: Silver Plated Brass
Product Marking
Body: Brand Logo, Current Rating
Rated Voltage, and
T - Characteristic “T”
Insulation Resistance
(after Opening)
MIL-STD-202, Method 302,
Test Condition A (10,000 ohms,
Minimum)
Solderability MIL-STD-202, Method 208
Resistance to
Soldering Heat
MIL-STD-202, Method 210,
Test Condition B (10 sec at 260oC)
Moisture Sensitivity
Level Level 1 J-STD-020
PCB
Recommendation
for Thermal
Management
Min. copper layer thickness = 100um
Min. copper trace width = 10mm
Alternate methods of thermal man-
agement may be used. In such cases,
under normal operations, the maximum
temperature of the fuse body should
not exceed 80OC in a 25OC ambient
environment.
Product Characteristics
5A 3.05
(.12")
3.05
(.12")
10.08
(.397")
3.25
(.128")
3.43
(.135")
12.6
(.496")
6.10
(.240")
Recommended Pad Layout
1.70 typ
(.067")
AC250V
T
Dimensions
Packaging
Part Numbering System
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code
24mm Tape and Reel EIA-RS 481-2 (IEC 286, part 3) 1500 DR
Operating Temperature –55OC to 125OC
Thermal Shock
MIL-STD-202, Method 107,
Test Condition B (5 cycles -65oC
to +125oC)
Vibration MIL-STD-202, Method 201
(10-55 Hz)
Moisture Resistance
MIL-STD-202, Method 106,
High Humidity (90-98%RH), Heat
(65oC)
Salt Spray MIL-STD-202, Method 101,
Test Condition B
Mechanical Shock
MIL-STD-202, Method 213,
Test Condition I (100 G’s peak for
6 milliseconds)
0443 .500 D R
SERIES
AMP Code
QUANTITY Code
PACKAGING Code
Refer to Electrical
characteristics table
D = 1500 pcs
R = Tape and Reel
Example:
1.5 amp product is
0443 01.5 D R (0.5 amp
product shown above).
Disclaimer Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military,
aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other
application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those
expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any
purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products
used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is
subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Information furnished is believed to be accurate and reliable.
However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not
designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.

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