435 Series Datasheet by Littelfuse Inc.

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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/13/18
Surface Mount Fuses
Thin Film > 0402 Size > Very Fast-Acting > 435 Series
435 Series 0402 Fast-Acting Fuse
Description
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E10480 0.250 - 5.0A
29862 0.250 - 5.0A
Electrical Characteristics for Series
Features
35A interrupt rating at
32VDC
Small size with current
ratings of 0.25 to 5.0
amperes
RoHS compliant, Lead-
Free and Halogen-Free
Maximum protection of
sensitive circuits as fuses
are designed to open
consistently in <5sec at
200% overload.
Enhanced Breaking
Capacity, High l2t
% of Ampere
Rating Ampere
Rating Opening Time at 25OC
100% 0.250A - 5A 4 hours, Minimum
200% 0.375A - 5A 5 secs., Maximum
300% 0.250A 5 secs., Maximum
300% 0.375A - 5A 0.2 sec., Maximum
RoHS
Pb
Ampere
Rating
(A)
Amp
Code
Max Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2sec)
Nom
Voltage Drop
(mV)
Nom Power
Dissipation
(W)
Agency Approvals
0.250 .250 32
35A
@32VDC2
0.360010.0025 92.49 0.0231 x x
0.375 .375 32 0.193010.0035 84.64 0.03174 x x
0.500 .500 32 0.16001 0.0053 93.35 0.04668 x x
0.750 .750 32 0.105010.0120 101.84 0.07638 x x
1.0 0 0 01. 32 0.073010.0200 87.45 0.08745 x x
1.25 1.25 32 0.060010.0350 96.37 0.12046 x x
1.50 01.5 32 0.047010.0560 86.70 0.13005 x x
1.75 1.75 32 0.039010.0750 81.13 0.14198 x x
2.00 002. 32 0.030010.1000 70.62 0.14120 x x
2.50 02.5 32 0.020010.1560 55.25 0.13813 x x
3.00 003. 32 0.017010.2032 60.58 0.18740 x x
3.50 03.5 32 0.015010.3017 57.84 0.20244 x x
4.00 004. 32 0.010510.3084 57.00 0.22800 x x
5.00 005. 32 0.008510.5310 52.44 0.26220 x x
Electrical Specifications by Item
1. Measured at 10% of rated current, 25ºC.
2. Measured at rated voltage.
The 435 Series are fast-acting surface mount thin-film
fuses. Their ultra-small size (0402 size) makes them ideal for
secondary protection of circuits used in space constrained
applications such as hand-held portable electronic devices.
This series is 100% lead-free and meet the requirements of
the RoHS directive. New Halogen-Free 435 Series fuses are
available–to order use the “HF” suffix. See Part Numbering
section for additional information.
Applications
Cell phones
Battery packs
Digital cameras
DVD players
Hard disk drives.
Secondary protection for space constrained applications
such as:
Specifications are subject to change without notice. Application testing is strongly recommended.
Additional Information
Datasheet Samples
Resources
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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/13/18
Surface Mount Fuses
Thin Film > 0402 Size > Very Fast-Acting > 435 Series
Average Time Current Curves
0.001
0.01
0.1
1
10
100
0.1 1.0 10.0 100.0
TIME IN SECONDS
CURRENT IN AMPERES
1.5A
1.25A
1.75A
2A
2.5A
3A
3.5A
4A
5A
1A
.25A
.375A
.5A
.75A
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 – 120 secs
Average ramp up rate (Liquidus Temp
(TL) to peak 5°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)250+0/-5 °C
Time within 5°C of actual peak
Temperature (tp)20 – 40 seconds
Ramp-down Rate 5°C/second max
Time 25°C to peak Temperature (TP)8 minutes Max.
Do not exceed 260°C
Soldering Parameters
Temperature Re-rating Curve
Wave Soldering 260°C, 10 seconds max.
Note:
1. Rerating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
Example:
For continuous operation at 70 degrees celsius, the fuse should be deratedas follows:
I = (0.75)(0.80)IRAT = (0.60)IRAT
2. The temperature derating curve represents the nominal conditions. For questions
about temperature derating curve, please consult Littelfuse technical support
for assistance.
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
MasggKRHF s
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/13/18
Surface Mount Fuses
Thin Film > 0402 Size > Very Fast-Acting > 435 Series
Refer to Amp Code column in the
Electrical Specifications table.
The dot is positioned at the end of the
number sequence with whole ratings
and within for fractional ratings.
Example: 1.5 amp product is
043501.5KRHF (2 amp product shown)
Materials
Body: Epoxy / Glass Substrate;
Parts with ‘HF’ suffix: Halogen Free Epoxy / Glass
Terminations: 100% Tin over Nickel over Copper
Device Weight: 0.316mg
Terminal
Strength MIL-STD-202, Method 211, Test Condition A
Insulation
Resistance After Opening: Greater than 10,000Ohms
Operating
Temperature
–55°C to 90°C.
Consult temperature re-rating curve chart.
For operation above 90°C please contact
Littelfuse.
Thermal Shock Withstands 5 cycles of –55°C to 125°C
Vibration MIL-STD-202, Method 201
Product Characteristics
.558
(.022")
Reflow solder
recommended
mounting pad
dimensions
.991 +/- .051
(.039" +/- .002")
Marking code varies
with amperage.
Refer to Part Marking
System chart.
Cu
.508 +/- .051
(.020" +/- .002")
.229 +/- .102
(.009" +/- .004")
0.330 +/- .102
(.013" +/- .004")
.381
(.015") 1.55
(.061")
.584
(.023")
0.292 +/- .102
(.012" +/- .004")
.2159 +/- .0889
(.0085" +/- .0035")
Sn
A
B
C
D
Dimensions
Packaging
Part Numbering System
Part Marking System
Packaging
Option Packaging
Specification Quantity Quantity &
Packaging Code
8mm Tape
and Reel
EIA-481 Rev.
D (IEC 60286,
part 3) 10000 KR
A B C D
inch min 0.037 0.018 0.008 0.005
inch max 0.041 0.022 0.016 0.012
mm min 0.94 0.457 0.190 0.127
mm max 1.04 0.559 0.394 0.305
0435 002. K R HF S
SERIES
HALOGEN FREE ITEM
“S” - for .250A only
PACKAGING Code
R = Tape and Reel
QUANTITY Code
K = 10,000 Pieces
Amp
Code
Marking
Code
.250
.375
.500
.750
001.
1.25
01.5
1.75
002.
02.5
003.
03.5
004.
005.
X
Disclaimer Notice - 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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