044903.5MR Littelfuse Inc, 044903.5MR Datasheet - Page 2

• Manufacturer Part Number: 044903.5MR
• Description: FUSE 125V TIME-LAG 3.5A SMD
• Manufacturer: Littelfuse Inc
• Series: NANO²® 449r

Specifications of 044903.5MR

• Fuse Type: Slow Blow, Time Lag
• Voltage - Rated: 125VAC
• Current: 3.5A
• Dc Cold Resistance: 0.026 Ohm
• Melting I²t: 32.7
• Package / Case: Non-Standard SMD
• Size / Dimension: 0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)
• Mounting Type: Holder/Surface Mount
• Operating Temperature: -55°C ~ 125°C
• Current Rating: 3.5 Amps
• Voltage Rating: 125 Volts
• Fuse Size / Group: Nano
• Termination Style: SMD/SMT
• Body Material: Ceramic
• Product: Surface Mount Fuse
• Interrupt Rating: 50 Amps
• Color: -
• Dimensions: 6.1 mm L x 2.69 mm W
• Mounting Style: SMD/SMT
• Operating Temperature Range: - 55 C to + 125 C
• Resistance: 0.0261 Ohms
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Color: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 44903.5MR

Note:
1. Derating depicted in this curve is in addition to the standard derating of 25% for
449 Series
Soldering Parameters
Temperature Rerating Curve
Reflow Condition
Pre Heat
Average ramp up rate (Liquidus Temp
(T
T
Reflow
Peak Temperature (T
Time within 5°C of actual peak
Temperature (t
Ramp-down Rate
Time 25°C to peak Temperature (T
Do not exceed
Wave Soldering Parameters
continuous operation.
S(max)
L
) to peak
to T
L
- Ramp-up Rate
- Temperature Min (T
- Temperature Max (T
- Time (Min to Max) (t
- Temperature (T
- Temperature (t
p
)
P
)
L
L
)
) (Liquidus)
Introduction to Circuit Protection
Introduction to Circuit Protection
s(min)
s(max)
s
)
P
)
)
)
Pb – Free assembly
150°C
200°C
60 – 120 secs
3°C/second max.
3°C/second max.
217°C
60 – 90 seconds
250
20 – 40 seconds
5°C/second max.
8 minutes max.
260°C
Temperature,
3 seconds max.
NANO
+0/-5
Surface Mount Fuses
°C
2®
> Slo-Blo
54
®
Transientology
Average Time Current Curves
> 449 Series
T
T
1000
0.01
S(max)
100
S(min)
0.1
10
25
1
T
T
0
P
L
time to peak temperature
Please refer to www.littelfuse.com/series/449.html for current information.
(t 25ºC to peak)
CURRENT IN AMPERES
t
Preheat
S
1
Specifications are subject to change without notice.
Ramp-up
10
t
P
t
L
Time
© 2009 Littelfuse, Inc.
Critical Zone
Ramp-down
T
L
to T
100
P