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參數(shù)資料
| 型號： | 0429007.WRMLHF |
| 元件分類： | 保險(xiǎn)絲 |
| 英文描述： | VERY FAST BLOW ELECTRIC FUSE, 7A, 24VAC, 24VDC, 35A (IR), SURFACE MOUNT |
| 封裝： | ROHS COMPLIANT |
| 文件頁數(shù)： | 2/3頁 |
| 文件大?。?/td> | 588K |
| 代理商： | 0429007.WRMLHF |
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
34
2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
429 Series
Thin Film > 1206 Size > Very Fast-Acting > 429 Series
Please refer to www.littelfuse.com/series/429.html for current information.
Average Time Current Curves
7A
TI
M
E
IN
SE
CO
ND
S
CURRENT IN AM PERES
0.01
0.1
1
10
100
10
100
0.001
reflow condition
Pb – Free assembly
pre Heat
-Temperature min (T
s(min))
150°C
-Temperature max (T
s(max))
200°C
-Time (min to max) (t
s)
60 – 180 secs
Average ramp up rate (liquidusTemp
(T
l) to peak
5°C/second max
T
S(max) to Tl - ramp-up rate
5°C/second max
reflow
-Temperature (T
l) (liquidus)
217°C
-Temperature (t
l)
60 – 150 seconds
peakTemperature (T
p)
250+0/-5 °C
Time within 5°c of actual peak
Temperature (t
p)
20 – 40 seconds
ramp-down rate
5°C/second max
Time 25°c to peakTemperature (T
p)
8 minutes Max.
Do not exceed
260°C
Soldering Parameters
Temperature Rerating Curve
Wave Soldering
260°C, 10 seconds max.
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)IRAT
2. The temperature derating curve represents the nominal conditions. For questions
about temperature derating curve, please consult Littelfuse technical support
for assistance.
Time
Te
mperatur
e
TP
TL
TS(max)
TS(min)
25
tP
tL
tS
time to peak temperature
(t 25C to peak)
Ramp-down
Ramp-up
Preheat
Critical Zone
TL to TP
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| 0429007.WRML | VERY FAST BLOW ELECTRIC FUSE, 7A, 24VAC, 24VDC, 35A (IR), SURFACE MOUNT |
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