Surface Mount Fuses
Ceramic Fuse > 501 Series
501 Series – High Current 1206 Fast-Acting Fuse
Description
The 501 Series is a 100% Lead-free, RoHS compliant and
Halogen-free fuse series designed specifically to provide
over- current protection to circuits that operate under high
working ambient temperature up to 150°C.
The general design ensures excellent temperature stability
and performance reliability.
The high I
2
t values which is typical in the Littelfuse
Ceramic Fuse family, ensure high inrush current withstand
capability.
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E10480
LR29862
AMPERE RANGE
10A - 20A
10A - 20A
Features
from -55ºC to +150ºC
over-current protection
in high current voltage
regulator module (VRM)
applications
Applications
Module (VRM)
Equipment
compliant and Halogen-
free
and lead-free reflow /
wave soldering
Electrical Characteristics for Series
% of Ampere
Rating
100%
350%
Ampere Rating
10A – 20A
10A – 20A
Opening Time at 25ºC
4 Hours, Minimum
5 Seconds, Maximum
Electrical Specifications by Item
Ampere
Rating
(A)
10
12
15
20
Amp
Code
010.
012.
015.
020.
Max. Voltage
Rating
(V)
24
24
24
24
Interrupting
Rating
(DC)
1
Nominal
Nominal
Resistance Melting I
2
T
(Ohms)
2
(A
2
Sec.)
3
0.00427
0.00321
0.00250
0.00200
10.385
20.341
36.100
54.760
Nominal Voltage
Drop At Rated
Current (V)
4
0.05679
0.04891
0.04605
0.05936
Nominal Power Agency Approvals
Dissipation At
Rated Current (W)
0.5679
0.5870
0.6908
1.1871
x
x
x
x
x
x
x
x
2
t measured at 1 msec. opening time. For other I
2
t data refer to chart.
devices be operated continuously at no more than 80% rated current. See “Temperature
Rerating Curve”for additional rerating information.
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/501.html for current information.
25
Revised: August 25, 2009
501 Series
Surface Mount Fuses
Introduction to Circuit Protection
Transientology
Ceramic Fuse > 501 Series
Temperature Rerating Curve
Average Time Current Curves
140
PERCENT OF RATING
120
100
80
60
40
-65
-45
-25
-5
15
35
55
75
95
115
135
155
TEMPERATURE (°C)
1. Rerating depicted in this curve is in addition to the standard rerating of 20% for
continuous operation.
I = (0.80)(0.85)I
RAT
= (0.68)I
RAT
Soldering Parameters
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (Min to Max) (t
s
)
Average Ramp-up Rate (Liquidus Temp
(T
L
) to peak)
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Temperature (t
L
)
150°C
60 – 180 seconds
3°C/second max.
5°C/second max.
217°C
60 – 150 seconds
260
+0/-5
T
P
Ramp-up
t
P
Critical Zone
T
L
to T
P
Temperature
200°C
T
L
T
S(max)
Preheat
t
L
Ramp-down
T
S(min)
t
S
25
time to peak temperature
(t 25ºC to peak)
Time
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
°C
10 – 30 seconds
6°C/second max.
8 minutes max.
260°C
Wave Soldering
260°C, 10 seconds max.
501 Series
26
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/501.html for current information.
Surface Mount Fuses
Ceramic Fuse > 501 Series
Product Characteristics
Body:
Advanced Ceramic
Terminations:
Element Cover Coating:
Lead-free Glass
Moisture Resistance
Thermal Shock
Mechanical Shock
Vibration
Vibration,
High Frequency
Dissolution of
Metallization
Terminal Strength
IEC 60127-4
Condition A
Materials
Moisture
Sensitivity Level
Solderability
Humidity Test
ESD Immunity
Resistance to
Solvents
Dimensions
3.200 ± .1778
[.126 ± .007]
Part Marking System
Amp Code
010.
012.
015.
1.000
[.039]
1.63 +.10/-.20
[.064 +.004/-.008]
Marking Code
10
12
15
20
20
020.
.8179 +.046/-.076
[.0322 +.0018/-.003]
TERMINATION
Part Numbering System
0501 020. W R
SERIES
.520 ± .200
[.020 ± .008]
1.000
[.039]
1.500
[.059]
PACKING CODE
AMP CODE
QUANTITY CODE
1.800
[.071]
W = 3000 pcs
3.500
[.138]
Packaging
Packaging Option
8mm Tape and Reel
Packaging Specification
EIA-481-1 (IEC 286, part 3)
Quantity
3000
Quantity &
Packaging Code
WR
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/501.html for current information.
27
501 Series
Embedded System
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