PRODUCT SELECTION & COMPARISON
Surface Mount Chip Fuses
NIC Components Corp.
www.NICcomp.com | Page 1
PRODUCT TRAINING
SMT Fuses
 Fuse is over-current protection device
 Under adverse over-current conditions the fuse operates to ‘open’ and protect
the electronic equipment from damage due to excessive current flow
 The goal in selection the proper fuse is to select device rating which will
operate trouble-free until adverse conditions occur
 In ideal case, need to know the following information to make the best fuse
selection
1.
2.
3.
4.
5.
6.
7.
NIC Components Corp.
Circuit voltage (VDC or VAC)
Nominal operating current
Interrupting Rating
Ambient Temperature
Overload Conditions & Opening Times
Maximum available fault current
Inrush, Pulse or Surge current waveform
www.NICcomp.com | Page 2
PRODUCT TRAINING
SMT Fuses
1.) Circuit Voltage & Voltage Rating:
Maximum operating voltage should not exceed the fuse rated voltage
 NFVC6125F = 125VAC/160VDC (up to 10A); 65VAC/ (above 10A)
 NFVC6125H = 250VAC (all ratings)
NFVC6125S = 125VAC (all ratings)
Rule of thumb - DO NOT use 125VAC rated fuse in circuit application operating at greater than 125VAC
2.) Normal Operating Current
Fuses must function without opening, under rated current conditions (rated current @ +25℃)
for a least 4 hours
Rule of thumb - operate at no more than 75% of fuse current rating @ +25℃
3.) Interrupt Rating:
Interrupt rating can also be referenced as 'breaking capacity' or 'short circuit rating‘ of the
fuse, and is a safety rating for the maximum current that can safely be interrupted by the fuse
under rated voltage.
Rule of thumb - A fuse with a low interrupting rating should NOT be used in circuit applications where
higher fault current could exist, as the fuse could fail potentially cause a safety hazard (i.e. arcing, fire or
fracture) upon opening
NIC Components Corp.
www.NICcomp.com | Page 3
PRODUCT TRAINING
SMT Fuses
4.) Ambient Temperature:
When operating at temperatures above or below +25℃, please refer to the temperature
derating curve found on product specifications
Rule of thumb – Derate the current rating of the fuse with increasing operating temperature
5.) Overload Conditions and Opening Times:
Electrical overload condition is abnormal excessive current flow condition within the electrical
circuit, which exceeds the circuit’s normal full load current condition.
For fuses, the first overload condition point is typically 200% to 300% of fuse current rating
Overload curve, at left, shows 1.0A fuse
opening in one second with between
200% ~ 300% (2.0A ~ 3.0A) applied
NIC Components Corp.
www.NICcomp.com | Page 4
PRODUCT TRAINING
SMT Fuses
6.) Maximum Available Fault Current:
(as referenced in #3 above) The interrupt rating of the fuse must meet or exceed the maximum
fault current of the circuit.
Rule of thumb - A fuse with a low interrupting rating should NOT be used in circuit applications where
higher fault current could exist, as the fuse could fail potentially cause a safety hazard upon opening
7.) Pulse Current Characteristics
Transient pulse current is used to describe current waveform shapes resulting from start-up,
in-rush, pulse, surge or transient currents within a circuit. Transient pulse currents will
produce thermal cycling and possible mechanical failure of the fuse.
Capability of a fuse to withstand surge pulse conditions can be determined from the I2t
characteristics of the fuse. Melting I2t, is the thermal energy level causing melting (opening) of
the fuse element. Fuse component size, materials and construction will establish the I2t
characteristics of the fuse.
Rule of thumb - Slow blow type fuses are suggested for high in-rush and pulse current applications
Rule of thumb. The circuit designer needs to properly size the fuse based upon the fuse melting I2t value
being greater than the pulse current I2t divided by the pulse factor Fp (see page 7) … Typically the selected
fuse should have melting I2t value much greater than the I2t value of the pulse (See pages 6 & 7)
NIC Components Corp.
www.NICcomp.com | Page 5
PRODUCT TRAINING
SMT Fuses
7.) Pulse Current Characteristics
Use the correct formula, shown above, to determine
the required I2t characteristics of the fuse
NIC Components Corp.
www.NICcomp.com | Page 6
PRODUCT TRAINING
SMT Fuses
7.) Pulse Current Characteristics
Pulse factor ‘Fp’
Correct the I2t required, based upon the number of
pulse cycles as seen by the fuse (see above curve)
Example: 1000 cycles derate I2t to 50%
Example: 100,000 cycles derate I2t to 25%
NIC Components Corp.
www.NICcomp.com | Page 7
PRODUCT TRAINING
SMT Fuses
Fuse Selection (non-pulse applications)
Establish the circuit values:
operating current, in-rush current
waveform and determine
operating temperature
Use derating factors :
Temperature Derating
① Derate 75% (0.75)
② Derate for temperature factor
Example:
Operating 1.3A @ + 80℃
1.3A / 0.75 / 0.91 = 1.905A
+ 80℃
NIC Components Corp.
www.NICcomp.com | Page 8
PRODUCT TRAINING
SMT Fuses
Fuse Selection (pulse applications)
Establish the circuit values:
operating current, in-rush current
waveform and determine
operating temperature
Pulse Example: 1.905A
Calculate I2t needed based upon
pulse type (see page 6), and correct
I2t for number of pulses (see page 7)
Pulse Example:
100K pulses 4Amp square wave for 10mS
I2t = (4A)2 x 10mS = 0.16
Use derating factors :
① Derate 75% (0.75)
② Derate for temperature factor
Corrected for 100K pulses (Fp = 25%) = 0.64
Select fuse with I2t >0.64
Temperature Derating
Example:
Operating 1.3A @ + 80℃
1.3A / 0.75 / 0.91 = 1.905A
+ 80℃
NIC Components Corp.
www.NICcomp.com | Page 9
PRODUCT TRAINING
SMT Fuses
Operating 1.3A @ + 80℃
1.3A / 0.75 / 0.91 = 1.905A
Pulse Example:
100K pulses 4Amp square wave for 10mS
I2t = (4A)2 x 10mS = 0.16
Corrected for 100K pulses = 0.64
Select fuse with I2t >0.64
Suggested PN: NFVC6125F2R00TRF
2.0A rated with I2t of 1.34 (A2S)
NIC Components Corp.
www.NICcomp.com | Page 10
SMT Fuses Types
Thick Film
Wire-In-Air
Ceramic body
Solder dome
Termination
(Cap)
NFVC
series
NFCC / NFHC / NFSC series
Melting wire
Thick Film construction advantages
Wire-In-Air construction advantages
 Consistent melting characteristic
 Length and diameter of the melting wire can be
adjusted to meet many different applications
 Excellent inrush capability
 Good lightning immunity (1.2KV lightning test)
NIC Components Corp.
 Small size
 Low Profile
 Lower Cost
 Range of current ratings offered
www.NICcomp.com | Page 11
SMT Fuses Types
Technology
NFCC / NFHC / NFSC
series
Thick Film
NFVC
series
Wire-In-Air
(WIA)
Typical Case Sizes
1206, 0805,
0603, 0402
Wire-In-Air
2410 (6125)
Wire-In-Air
Voltage Rating
High Current Rating
Anti-Inrush (I2t)
Size (small)
Thickness (low profile)
Cost
Automated Production
NIC Components Corp.
Thick Film



-

Thick Film
Thin Film
-

-




www.NICcomp.com | Page 12
NEW
English
Size
2410
Rated Current
(A)
1
Rated
Voltage(VAC)
125
Fusing
Type
fast
Littelfuse
Bussmann
KOA
AEM
Conquer
NFVC6125F1R00TRF
Metric
Size
6125
0451 001.
6125FF1-R
CCF1NTE1
AF2-1.00V125T
SEF 001
NFVC6125F1R25TRF
6125
2410
1.25
125
fast
0451 1.25
6125FF1.25-R
CCF1NTE1.25
AF2-1.25V125T
NFVC6125F1R60TRF
6125
2410
1.6
125
fast
0451 01.6
6125FF1.5-R
CCF1NTE1.6
NFVC6125F2R00TRF
6125
2410
2
125
fast
0451 002.
6125FF2-R
CCF1NTE2
AF2-2.00V125T
SEF 002
NFVC6125F2R50TRF
6125
2410
2.5
125
fast
0451 02.5
6125FF2.5-R
CCF1NTE2.5
AF2-2.50V125T
SEF 2.50
NFVC6125F3R15TRF
6125
2410
3.15
125
fast
0451 3.15
6125FF3-R
CCF1NTE3.15
AF2-3.15V125T
SEF 003
NFVC6125F4R00TRF
6125
2410
4
125
fast
0451 004.
6125FF4-R
CCF1NTE4
AF2-4.00V125T
SEF 004
NFVC6125F5R00TRF
6125
2410
5
125
fast
0451 005.
6125FF5-R
CCF1NTE5
AF2-5.00V125T
SEF 005
NFVC6125F6R30TRF
6125
2410
6.3
125
fast
0451 06.3
6125FF6.3-R
CCF1NTE6.3
AF2-6.30V125T
SEF 006
NFVC6125F7R00TRF
6125
2410
7
125
fast
0451 007.
6125FF7-R
AF2-7.00V125T
SEF 007
NFVC6125F8R00TRF
6125
2410
8
125
fast
0451 008
6125FF8-R
CCF1NTE8
AF2-8.00V125T
SEF 008
NFVC6125F10R0TRF
6125
2410
10
125
fast
0451 010.
6125FF10-R
CCF1NTE10
AF2-10.0V125T
SEF 010
NFVC6125F12R0TRF
6125
2410
12
65
fast
0451 012.
6125FF12-R
AF2-12.0V125T
SEF 012
NFVC6125F15R0TRF
6125
2410
15
65
fast
0451 015.
6125FF15-R
AF2-15.0V125T
SEF 015
NFVC6125F20R0TRF
6125
2410
20
65
fast
NIC Part Numbers
NIC Components Corp.
SEF 1.50
AF2-20.0V125T
www.NICcomp.com | Page 13
2410
Rated
Current
(A)
1
Rated
Voltage
(VAC)
250V
2410
1.25
250V
6125
2410
1.5
6125
2410
6125
2410
6125
6125
Fusing Type
Littelfuse
Bussmann
KOA
AEM
Conquer
High Inrush
NA
NA
NA
MF2410F1.000TM
CQ24PT 001
High Inrush
NA
NA
NA
MF2410F1.250TM
NA
250V
High Inrush
NA
NA
NA
NA
CQ24PT 1.50
1.6
250V
High Inrush
NA
NA
NA
MF2410F1.600TM
NA
2
250V
High Inrush
NA
NA
NA
MF2410F2.000TM
CQ24PT 002
2410
2.5
250V
High Inrush
NA
NA
NA
NA
CQ24PT 2.50
2410
3
250V
High Inrush
NA
NA
NA
NA
CQ24PT 003
6125
2410
3.15
250V
High Inrush
NA
NA
NA
NA
NA
6125
2410
3.5
250V
High Inrush
NA
NA
NA
NA
NA
6125
2410
4
250V
High Inrush
NA
NA
NA
NA
CQ24PT 004
6125
2410
5
250V
High Inrush
NA
NA
NA
NA
CQ24PT 005
NIC Part Numbers
Size
Size
Fusing Type
Littelfuse
Bussmann
KOA
AEM
Conquer
NFVC6125S1R00TRF
NFVC6125S1R25TRF
NFVC6125S1R50TRF
NFVC6125S1R60TRF
NFVC6125S2R00TRF
NFVC6125S2R50TRF
NFVC6125S3R00TRF
NFVC6125S3R15TRF
NFVC6125S3R50TRF
NFVC6125S4R00TRF
NFVC6125S5R00TRF
6125
2410
High Inrush
0452 001.
6125TD1-R
NA
NA
SET 001
6125
2410
1.25
125V
High Inrush
NA
NA
NA
NA
6125
2410
1.5
125V
High Inrush
0452 01.5
6125TD1.5-R
NA
InRushNA
6125
2410
1.6
125V
High Inrush
NA
NA
NA
NA
NA
6125
2410
2
125V
High Inrush
0452 002.
6125TD2-R
NA
NA
SET 002
6125
2410
2.5
125V
High Inrush
0452 02.5
6125TD2.5-R
NA
NA
SET 2.50
6125
2410
3
125V
High Inrush
0452 003.
6125TD3-R
NA
NA
SET 003
6125
2410
3.15
125V
High Inrush
NA
NA
NA
NA
SET 3.15
6125
2410
3.5
125V
High Inrush
0452 03.5
6125TD3.5-R
NA
NA
SET 3.50
6125
2410
4
125V
High Inrush
0452 004.
6125TD4-R
NA
NA
SET 004
6125
2410
5
125V
High Inrush
0452 005.
6125TD5-R
NA
NA
SET 005
NIC Part Numbers
Size
Size
NFVC6125H1R00TRF
NFVC6125H1R25TRF
NFVC6125H1R50TRF
NFVC6125H1R60TRF
NFVC6125H2R00TRF
NFVC6125H2R50TRF
NFVC6125H3R00TRF
NFVC6125H3R15TRF
NFVC6125H3R50TRF
NFVC6125H4R00TRF
NFVC6125H5R00TRF
6125
6125
NIC Components Corp.
Rated
Rated
Current
Voltage (VAC)
(A)
1
125V
High InRush
High
www.NICcomp.com | Page 14
NA
SET 1.50
NFCC & NFHC Series
Secondary Voltage (low voltage; fast acting) Chip Fuses
COMPETITORS / CHIP FUSES:
 Belfuse Fast acting C2Q (0603) / C1Q (1206) ... Slow blow C1S (1216)
 Cooper Bussman CC06 / CC12H / 3216FF
 Vishay MFU Series - 0402 / 0603 / 0805 / 1206 / & TFU 0603
NIC Components Corp.
JDYX2.E302168
Fuses, Supplemental – Component
www.NICcomp.com | Page 15
NSFC Series
Secondary Voltage (low voltage; 32V; slower acting) Chip Fuses
JDYX2.E302168
Fuses, Supplemental - Component
NIC Components Corp.
www.NICcomp.com | Page 16
PRODUCT COMPARISON
NIC Components NFVC6125 to Littelfuse 0451 Comparison
DESC: Fast Acting SMT Fuses
 Technology
 Specifications
 Structure & Dimensions
 DCR / 2In / I2T / Thermal Shock / Surface Temperature Rise
 Summary
NIC Components Corp.
www.NICcomp.com | Page 17
Comparison
Company
NIC
Littelfuse
P/N
NFVC6125F1R00TRF
0451001.MRL
Structure
Advantage
Disadvantage
NIC Components Corp.
1.Excellent thermal conductivity
2.Excellent anti-surge capability
3. Stable fusing time
and good reliability.
4.Excellent solder ability
5.Low surface temperature rise
6.Full automated production line
1. Production capacity
1.Excellent thermal conductivity
2. Stable fusing time
and good reliability
3.Excellent solder ability
1. High surface temperature rise
2. Long Lead-time
3. Non-automated production line
www.NICcomp.com | Page 18
Comparison: Structure & Dimensions
Structure Comparison Table for 1A Rating
NIC
Littelfuse
Ceramic
Ceramic
Curved-wire
Curved-wire
External View
FINDING:
 Similar Construction
Internal View
Wire Structure
1.Dimension Specification
Company
L(mm)
W(mm)
T(mm)
t(mm)
NIC
6.1±0.20
2.50±0.10
2.50±0.1
1.40±0.10
Littelfuse
6.1
2.69
2.69
1.45
2. Component Measurement
Company
L(mm)
W(mm)
T(mm)
t(mm)
NIC
6.00
2.56
2.55
1.33
Littelfuse
6.00
2.57
2.57
1.42
NIC Components Corp.
FINDING:
 Same size
 Same PCB footprint and same PCB layout
www.NICcomp.com | Page 19
Comparison: Specifications
Rated
Voltage(V)
Nominal
DCR
(Ω)
I2t
(A2S)
Interrupting
Voltage
(AC/DC)
Company
PN
AMP
(A)
NIC
NFVC6125F1R00TRF
1
125V AC
160V DC
0.080
0.56
125/160
Littelfuse
0451001.MRL
1
125V AC
125V DC
0.153
0.459
125/125
Advantage: NIC NFVC
 Lower DCR
 Higher I2t
NIC Components Corp.
www.NICcomp.com | Page 20
Comparison: Typical DCR
1.DCR Spec.
Company
PN
AMP(A)
Nominal DCR(Ω)
NIC
NFVC6125F1R00TRF
1
0.080
Littelfuse
0451001.MRL
1
0.153
2.Typical DCR Measurements; n = 20
300.00
Little Fuse 04511001.MRL
DC Resistance (mΩ)
250.00
200.00
150.00
NIC NFVC6125F1R00TRF
100.00
50.00
0.00
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
FINDING:
 NIC NFVC6125F1R00TRF has lower DCR than Littelfuse 04511001.MRL
NIC Components Corp.
www.NICcomp.com | Page 21
Comparison: Typical I2T
Company
NIC
Littelfuse
Spec. I2T
0.56 (A2S)
0.459 (A2S)
I2T = The thermal energy level causing
melting (opening) of the fuse element.
Test Condition: 10 A Current
Test Result
NIC
Littelfuse
sample
10In (mS)
I2t (A2S)
10In (mS)
I2t (A2S)
1
5.560
0.556
3.76
0.376
2
5.480
0.548
4.08
0.408
3
5.380
0.538
4.08
0.408
4
5.220
0.522
3.92
0.392
5
5.060
0.506
4.24
0.424
Avg.
5.34
0.542
4.02
0.402
FINDINGS:
 I2T of NIC NFVC6125F1R00TRF is better than Littelfuse 451
 NIC NFVC6125F1R00TRF has better anti-surge capability
NIC Components Corp.
www.NICcomp.com | Page 22
Comparison: Typical Fusing Time
Test Condition
Loading current = 2A
Spec: 2In rated current ≤ 5 Seconds
Test Result
Time: Seconds
S/N
NIC
Littelfuse
1
0.210
0.102
2
0.210
0.122
3
0.195
0.115
4
0.248
0.140
5
0.203
0.132
Avg.
0.213
0.122
FINDINGS:
 Fusing times are very similar … all less than 0.5 seconds
NIC Components Corp.
www.NICcomp.com | Page 23
Comparison: Thermal Shock
DCR Change with Thermal Cycle
Test Condition
5 Cycles between -55℃/+125℃, 60 minutes @ each extreme
NIC
Littelfuse
NFVC6125F1R00TRF
0451001.MRL
S/N
initial
after
change(%)
initial
after
change(%)
1
84.14
83.90
-0.29%
138.2
138.6
0.29%
2
83.79
83.53
-0.31%
136
136.4
0.29%
3
82.91
82.77
-0.17%
152.8
153.4
0.39%
4
82.65
82.48
-0.21%
140.4
140.9
0.36%
5
79.74
79.48
-0.33%
131
131.6
0.46%
MIN
79.74
79.48
-0.17%
131
131.6
0.29%
MAX
84.14
83.90
-0.33%
152.8
153.4
0.46%
AVG
82.65
82.43
0.26%
139.68
140.18
0.36%
FINDINGS:
 NIC NFVC has better thermal cycle performance than Littelfuse 451
NIC Components Corp.
www.NICcomp.com | Page 24
Comparison: Surface Temperature Rise
Test Condition
Room Temp.
+20℃
Current(A)
1.25A
Time(min)
60min
Test equipment
NIC Components Corp.
www.NICcomp.com | Page 25
Comparison: Surface Temperature Rise
Company
NIC
Littelfuse
Surface
Temperature
of Fuse
+43°C
+83°C
Fe (68.18%)
Ni (34.82%)
Ag(93.55%)
Higher heating … Littelfuse
element use Fe/Ni/Ag alloy
material. It has higher internal
resistance, so the temperature
rise is higher than NIC NFVC
FINDINGS:
 NIC NFVC has lower self-heating than Littelfuse 451
NIC Components Corp.
www.NICcomp.com | Page 26
Comparison: Summary
NIC NFVC
Littelfuse 0451
NFVC6125F1R00TRF
0451001.MRL
DCR
Excellent
Good
2In Fusing Time
Excellent
Excellent
I2T
Excellent
Good
Thermal Shock
Excellent
Good
Surface Temp. Rise
Excellent
Good
Performance
SUMMARY:
NFVC6125 series products have excellent performance, superior to Little fuse
in above performance comparison, and are compatible as replacement with
Littelfuse 451 type
NIC Components Corp.
www.NICcomp.com | Page 27
Technical & Sales Support
NIC has broad offering in Performance Passives
Additional Information Needed?
Need Samples?
Technical Support: tpmg@niccompcom
Sales Support: sales@niccomp.com
NIC Components Corp.
European Engineering Support
North America Engineering Support
SE Asia Engineering Support
www.NICcomp.com | Page 28