Surface Mount Fuses
Thin Film > 1206 Size > Very Fast-Acting > 429 Series
429 Series Fuse
Description
The 429 Series Fast-Acting SMF is a small (1206 size) thin-
film device designed for secondary protection of circuits
used in space constrained applications such as hand-held
portable electronic devices.
This series is Halogen-Free, Lead-Free and meets the
requirements of the RoHS directive.
Agency Approvals
Agency
Agency File number
e10480
lr29862
Ampere rAnge
7A
7A
• RoHS compliant and
Lead-Free 7A device
available-add ‘L suffix
’
to part number.
• Halogen-Free 7A
device available-add
‘HF’ suffix to the part
number
Applications
•
For new designs up
to 5A please consult
the 433 or 466 Series
Electrical Characteristics for Series
% of Ampere
rating
100%
200%
300%
Opening Time at 25
O
c
4 hours, Minimum
5 sec., Maximum
0.2 sec., Maximum
Secondary protection for space constrained applications
such as:
• Cell phones
• Battery packs
• Digital cameras
• DVD players
• Hard disk drives.
Electrical Specifications by Item
Ampere
rating
(A)
7
.00
Amp
code
007
.
max
Voltage
rating
(V)
24
interrupting
rating
35 amperes
@ voltage, VAC/VDC
nominal cold
resistance
(Ohms)
0.00925
nominal
melting
i
2
t (A
2
sec)
3.6000
Agency
Approvals
x
x
1. Measured at 10% of rated current, 25ºC.
2. Measured at rated voltage.
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/429.html for current information.
33
Revised: Jun 16 , 2011
429 Series
429 Series
Features
Transientology
Thin Film > 1206 Size > Very Fast-Acting > 429 Series
Surface Mount Fuses
Introduction to Circuit Protection
Temperature Rerating Curve
Average Time Current Curves
7A
100
10
TI E I SEC O N D S
M N
1
0.
1
Note:
1. Derating 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)I
RAT
= (0.60)I
RAT
2. The temperature derating curve represents the nominal conditions. For questions
about temperature derating curve, please consult Littelfuse technical support
for assistance.
0.
01
0.
001
0.
1
1
10
C U R R EN T I A M PER ES
N
100
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
)
Pb – Free assembly
150°C
60 – 180 secs
5°C/second max
5°C/second max
217°C
60 – 150 seconds
250
+0/-5
T
P
T
L
Temperature
t
P
Ramp-up
Critical Zone
T
L
to T
P
200°C
T
S(max)
T
S(min)
Preheat
t
L
Ramp-down
t
S
time to peak temperature
(t 25ºC to peak)
25
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
20 – 40 seconds
5°C/second max
8 minutes Max.
260°C
Wave Soldering
260°C, 10 seconds max.
429 Series
34
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/429.html for current information.
Surface Mount Fuses
Thin Film > 1206 Size > Very Fast-Acting > 429 Series
Product Characteristics
Body:
Epoxy Substrate
Terminations, RoHS Compliant Device (429L):
100% Tin over Nickel over Copper
Element Cover Coat:
Conformal Coating
NOTE: Do not use alcohol-based cleaners or
solvents with 429 Series Thin-Film Fuses as it
may damage the coating.
– 55 C to 90 C.
Consult temperature rerating chart.
For operation above 90°C contact Littelfuse.
O
O
Humidity
MIL
-STD-202F
, Method 103B
Condition D
Withstands 10 – 55 Hz per MIL
-STD-
202F Method 201A and 10-2000 Hz
,
at 20 G’s per MIL
-STD-202F Method
,
204D, Condition D.
Greater than 10,000 ohms
MIL
-STD-202G, Method 210F
,
Condition D
Materials
Vibration
Insulation Resistance
(After Opening)
Resistance to
Soldering Heat
Operating
Temperature
Thermal Shock
Dimensions
R EC O M M EN D ED PA D LA YO U TS
3.
18
(125"
.
)
3.
81
(150"
.
)
1.
52
(060"
.
)
1.
14
(045"
.
)
1.
12
(044"
.
)
R EF.
1.
52
(060"
.
)
Part Marking System
Series
429L
marking
code
7
Part Numbering System
2. (098"
49 .
)
R EF.
1.
14
(045"
.
)
.
635
(025"
.
)
2.
03
(080"
.
)
R EFLO W SO LD ER
0429 007. WRM L HF
SERIES
AMP Code
Refer to Amp Code Column of
Electrical characteristics table
WRM = 3000 pieces, Tape and Reel
QuANTITy Code
L = Lead-Free device and
RoHS compliant device
Halogen-Free item
Packaging
packaging Option
Tape & Reel – 8mm tape
packaging Specification
EIA-481 Rev. D (IEC 60286, part 3)
Quantity
3000
Quantity &
packaging code
WRM
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/429.html for current information.
35
429 Series
429 Series
Withstands 5 cycles of – 55
O
C to 125
O
C
嵌入式系统
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