501 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
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 I2t values which is typical in the Littelfuse
Ceramic Fuse family, ensure high inrush current withstand
capability.
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E10480 10A - 20A
29862 10A - 20A
Features
Operating Temperature
from -55ºC to +150ºC
Designed to provide
over-current protection
in high current voltage
regulator module (VRM)
applications
100% Lead-free, RoHS
compliant and Halogen-
free
Suitable for both leaded
and lead-free reflow /
wave soldering
Electrical Characteristics for Series
% of Ampere
Rating Ampere Rating Opening Time at 25ºC
100% 10A – 20A 4 Hours, Minimum
350% 10A – 20A 5 Seconds, Maximum
Applications
RoHS
Pb
Voltage Regulator
Module (VRM)
Equipment
Notebook PC
DC-DC Converter
Ampere
Rating
(A)
Amp
Code
Max. Voltage
Rating
(V)
Interrupting
Rating
(DC)1
Nominal
Resistance
(Ohms)2
Nominal
Melting I2T
(A2Sec.)3
Nominal Voltage
Drop At Rated
Current (V)4
Nominal Power
Dissipation At
Rated Current (W)
Agency Approvals
10 010. 32
150 A @ 32 VDC
0.00362 10.385 0.04407 0.4407 x x
12 012. 32 0.00311 20.341 0.04927 0.5912 x x
15 015. 32 0.00250 39.700 0.04843 0.7265 x x
20 020. 32 0.00194 86.360 0.05888 1.1776 x x
Electrical Specifications by Item
Notes:
1. DC Interrupting Rating tested at rated voltage with time constant < 0.5 msec.
2. Nominal Resistance measured with < 10% rated current.
3. Nominal Melting I2t measured at 1 msec. opening time. For other I2t data refer to chart.
4. Nominal Voltage Drop measured at rated current after temperature has stabilized and
with fuse mounted on board with 3-oz Cu trace.
Devices designed to carry rated current for 4 hours minimum. It is recommended that
devices be operated continuously at no more than 80% rated current. See “Temperature
Re-rating Curve”for additional re-rating information.
Devices designed to be mounted with marking code facing up.
Specifications are subject to change without notice. Application testing is strongly recommended.
Additional Information
Datasheet Samples
Resources
% Littelfuse" [mm mm \ AnswL-v: mums
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/17
Surface Mount Fuses
Ceramic Fuse > 501 Series
Average Time Current Curves
0.001
0.010
0.100
1.000
10.000
100.000
TIME IN SECONDS
110100 1000
CURRENT IN AMPERES
10A
20A
15A
12A
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 – 180 seconds
Average Ramp-up Rate (Liquidus Temp
(TL) to peak) 3°C/second max.
TS(max) to TL - Ramp-up Rate 5°C/second max.
Reflow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL)60 – 150 seconds
Peak Temperature (TP)260+0/-5 °C
Time within 5°C of actual peak
Temperature (tp)10 – 30 seconds
Ramp-down Rate 6°C/second max.
Time 25°C to peak Temperature (TP)8 minutes max.
Do not exceed 260°C
Soldering Parameters
Temperature Re-rating Curve
40
60
80
100
120
140
-65 -45 -25 -5 15 35 55 75 95 115 135 155
TEMPERATURE (°C)
PERCENT OF RATING
Wave Soldering 260°C, 10 seconds max.
Example:
For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:
I = (0.80)(0.85)IRAT = (0.68)IRAT
Note:
1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for
continuous operation.
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
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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/17
Surface Mount Fuses
Ceramic Fuse > 501 Series
Materials
Body: Advanced Ceramic
Terminations: Ag / Ni / Sn (100% Lead-free)
Element Cover Coating: Lead-free Glass
Moisture
Sensitivity Level IPC/JEDEC J-STD-020, Level 1
Solderability IPC/ECA/JEDEC J-STD-002, Condition B
Humidity Test MIL-STD-202, Method 103, Conditions D
Resistance to
Solvents MIL-STD-202, Method 210, Condition B
Product Characteristics
Moisture Resistance MIL-STD-202, Method 106
Thermal Shock MIL-STD-202, Method 107,
Condition B
Mechanical Shock MIL-STD-202, Method 213,
Condition A
Vibration MIL-STD-202, Method 201
Vibration,
High Frequency
MIL-STD-202, Method 204,
Condition D
Dissolution of
Metallization
IPC/ECA/JEDEC J-STD-002,
Condition D
Terminal Strength IEC 60127-4
Dimensions
Packaging
Part Marking System
Packaging
Option
Packaging
Specification Quantity Quantity &
Packaging Code
8mm Tape
and Reel
EIA-481, IEC
60286, Part 3 3000 WR
Part Numbering System
20
1. 00
[.04]
1.63 +.10/-.20
[.064 +.004/-.008]
3.200 ± .1778
[.126 ± .007]
0.835 ± 0.15
[.033 ± .006]
.520 ± .200
[.020 ± .008]
1.500
[.059]
1.800
[.071]
3.500
[.138]
1. 000
[.039]
Amp Code Marking Code
010. 10
012. 12
015. 15
020. 20
0501 020. W R
Series
AMP Code
W = 3000 pcs
Quantity
R = Reel Pack
Packing Code
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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