Selecting the appropriate SinglFuse™ SMD Fuse for your
application is easy - just follow these simple steps:
Step 1. What is the preferred product footprint?
o 0603 – refer to the following data sheets:
o 0402 – refer to the following data sheets:
o 1206/1210 – refer to the following data sheets:
o 2410 – refer to the following data sheets:
o 2923 – refer to the following data sheets:
o 3812 – refer to the following data sheets:
Step 2. What is the normal operating current of the circuit?
(This is the equivalent of the Rated Current specification of the SinglFuse™ SMD fuses.)
Hint: Select a SinglFuse™ SMD fuse with a rated current greater than the operating current since a fuse is typically derated 25 % for operation at 25 °C
to avoid nuisance blowing. For example, if a customer wants a 1206 surface mount one-time fuse and has an operating current of 5.5 A, a fuse with a
rated current greater than 7.3 A will be recommended (5.5 A / 0.75 = 7.3 A).
Series Rated Current Rated Voltage
Fusing Time Typical I²t (A²s)
Operating Temperature
SF-1206S 0.5 – 7A 32 – 63 VDC 5 sec @ 250 % Ir 0.03 – 5.68 –20 to 105 °C
SF-1206SxxxM 0.5 – 8 A 32 – 63 VDC 5 sec @ 250 % I
r
0.002 – 2.3 –55 to 125 °C
SF-1206SxxxW 1.5 – 15 A 32 – 65 VDC 5 sec @ 250 % I
r
0.37 – 24.5 –55 to 125 °C
SF-1206SP 0.5 – 7 A 32 – 63 VDC 1 - 120 sec @ 200 % I
r
0.027 – 10.17 –20 to 105 °C
SF-1206SPxxxM 1 – 8 A 24 – 63 VDC 1 - 120 sec @ 200 % I
r
0.11 – 16.9 –55 to 125 °C
SF-1206F 0.5 – 7 A 32 – 63 VDC 60 sec @ 200 % I
r
0.011 – 3.25 –20 to 105 °C
SF-1206FP 0.5 – 7 A 32 – 63 VDC 5 sec @ 200 % I
r
0.015 – 3.3 –20 to 105 °C
SF-1206HIxxxM 1 – 8 A 24 – 63 VDC 60 sec @ 200 % I
r
0.11 – 60 –55 to 125 °C
SF-1206HHxxM 10 – 30 A 24 VDC 5 sec @ 350 % I
r
12 – 270 –55 to 125 °C
SF-1206HVxxM 10 – 40 A 35 VDC 5 sec @ 350 % I
r
15 – 240 –55 to 125 °C
• SF-0603F Series
• SF-0603FP Series
• SF-0603FPxxxF Series
• SF-0603FPxxxM Series
• SF-0603S Series
• SF-0603SxxxM Series
• SF-0603SP Series
• SF-0603SPxxxM Series
• SF-0603HIxxxF Series
• SF-0603HIxxxM Series
• SF-0402F Series • SF-0402FP Series
• SF-0402FPxxxF Series
• SF-0402S Series
• SF-0402SxxxM Series
• SF-1206F Series
• SF-1206FP Series
• SF-1206SP Series
• SF-1206SPxxxM Series
• SF-1206S Series
• SF-1206SxxxM Series
• SF-1206SxxxW Series
• SF-1210SxxxW Series
• SF-1206HHxxM Series
• SF-1206HIxxxM Series
• SF-1206HVxxM Series
• SF-2410FxxxW Series
• SF-2410F-T Series
• SF-2410FPxxxW Series
• SF-2410FP-T Series
• SF-2410SPxxxW Series
• SF-2410HI-T Series
• SF-2923HC-C Series • SF-2923UC-C Series
• SF-3812F-T Series
• SF-3812FG-T Series
• SF-3812SP-T Series • SF-3812TL-T Series
• SF-3812TM-T Series
Product Selection Worksheet
Bourns
®
SinglFuse
™
SMD Fuses
Step 6. Request samples from your nearest Bourns representative and start testing in your
application.
Step 4. What is the maximum circuit voltage?
Step 5. What is the nominal melt I
2
t?
Hint: Select a SinglFuse™ SMD fuse with a rated voltage equal to or greater than the circuit voltage.
For example, if a customer wants a 1206 surface mount one-time fuse with a rated current greater than 7.3 A, an ambient temperature of 115 °C, and a
maximum circuit voltage of 32 V, then part numbers SF-1206S800M-2 / SF-1206S800W-2 / SF-1206HV10M-2 will be suitable as the rated voltage is equal
to or greater than the circuit voltage of 32 V while the operating current and ambient temperature requirements are also met.
Hint: Refer to the Typical I
2
t of the data sheet and select a SinglFuse™ SMD fuse with suitable I
2
t to avoid blowing by pulse current in the circuit.
For example, if a customer wants a 1206 surface mount one-time fuse with a rated current greater than 7.3 A, ambient temperature of 115 °C, maximum
circuit voltage of 32 V, and a nominal melt I
2
t of 14 A
2
sec, then part number SF-1206HV10M-2 would be a suitable model as the typical I
2
t of 15 A
2
sec is
greater than nominal melt I
2
t of 14 A
2
sec.
Additional product selection support is available using the Bourns Parametric Search tool:
www.bourns.com/parametric-search
Step 3. What is the ambient temperature of the circuit?
Hint: Refer to the Operating Temperature of the data sheet and select a SinglFuse™ SMD fuse which is suit-
able for the ambient temperature. For example, if a customer wants a 1206 surface mount one-time fuse
with a rated current greater than 7.3 A and it will be used at an ambient temperature of 115 °C, then the SF-1206SxxxM / SF-1206SxxxW / SF-1206SPxxxM /
SF-1206HIxxxM / SF-1206HHxxM / SF-1206HVxxM series will be suitable as the rated current and ambient temperature requirements can be satisfied.
Series Part Number Rated Current Rated Voltage Fusing Time Typical I²t (A²s)
Operating
Temperature
SF-1206SxxxM
SF-1206SxxxM SF-1206S800M-2 8 A 32 VDC 5 sec @ 250 % I
r
2.3 –55 to 125 °C
SF-1206SxxxW SF-1206S800W-2 8 A 32 VDC 5 sec @ 250 % I
r
13.5 –55 to 125 °C
SF-1206SPxxxM SF-1206SP800M-2 8 A 24 VDC 1 – 120 sec @ 250 % I
r
16.9 –55 to 125 °C
SF-1206HIxxxM SF-1206HI800M-2 8 A 24 VDC 60 sec @ 200 % I
r
60 –55 to 125 °C
SF-1206HHxxM SF-1206HH10M-2 10 A 24 VDC 5 sec @ 350 % I
r
12 –55 to 125 °C
SF-1206HVxxM SF-1206HV10M-2 10 A 35 VDC 5 sec @ 350 % I
r
15 –55 to 125 °C
www.bourns.com
COPYRIGHT© 2019 • BOURNS, INC. • 4/19 • e/SF1902 • “Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries. “SinglFuse” is a trademark of Bourns, Inc. in the U.S. and other countries.
Product Selection Worksheet
Bourns
®
SinglFuse
™
SMD Fuses
F
1.25
E
Y
This model satisfies all the customer’s
requirements in this example