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參數資料
| 型號： | 0437.500WR |
| 元件分類： | 保險絲 |
| 英文描述： | FAST BLOW ELECTRIC FUSE, 0.5A, 63VAC, 63VDC, 50A (IR), SURFACE MOUNT |
| 封裝： | HALOGEN FREE AND ROHS COMPLIANT |
| 文件頁數： | 2/3頁 |
| 文件大小： | 504K |
| 代理商： | 0437.500WR |
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
18
2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
Please refer to www.littelfuse.com/series/437.html for current information.
437 Series
Ceramic Fuse > 437 Series
Average Time Current Curves
0.001
0.01
0.1
1
10
100
0.1
1
10
100
CURRENT IN AMPERES
T
IM
E
IN
S
E
C
O
N
D
S
.2
50
A
.3
75
A
.50
0A
.750A 1A
2A
7A
1.25 1.5A 1.75
2.5A 3A 3.5A 4A 5A
8A
reflow condition
Pb–freeassembly
pre Heat
-Temperature min (T
s(min))
150°C
-Temperature max (T
s(max))
200°C
-Time (min to max) (t
s)
60–180seconds
Average ramp-up rate (liquidusTemp
(T
l) to peak)
3°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)
60–150seconds
peakTemperature (T
p)
260+0/-5 °C
Time within 5°c of actual peak
Temperature (t
p)
10–30seconds
ramp-down rate
6°C/second max.
Time 25°c to peakTemperature (T
p)
8 minutes max.
Do not exceed
260°C
Soldering Parameters
Temperature Rerating Curve
40
60
80
100
120
140
-65
-45
-25
-5
15
35
55
75
95
115
135 155
TEMPERATURE (°C)
P
E
R
C
E
N
T
O
F
R
A
T
IN
G
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
Example:
For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:
I = (0.80)(0.85)I
RAT = (0.68)IRAT
Note:
1. Rerating depicted in this curve is in addition to the standard rerating of 20% for
continuous operation.
Wave Soldering
260°C, 10 seconds max.
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