5. All terms and symbols are consistent with ANS/IEEE C62.35
6. Transient Voltage Suppressors (TVS) are devices used to protect vulnerable circuits from electrical overstress such as that caused by electrostatic discharge, inductive load
switching and induced lightning. Within the TVS, damaging voltage spikes are limited by clamping or avalanche action of a rugged silicon pn junction which reduces the
amplitude of the transient to a nondestructive level. See Fig. 7 & Fig. 8
http://www.formosams.com/
TEL:886-2-22696661
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Document ID
Issued Date
2009/08/10
Revised Date
-
Revision
A
Page.
9
Page 3
DS-221826
SMD Transient Voltage Suppressor
5.0SMCJ Series
Formosa MS
Rating and characteristic curves (5.0SMCJ SERIES)
Fig.1 - Pealk Pulse Power Rating Curve
100
Peak Pulse Power, P
PPM
(KW)
Peak Pulse Power or Current
Derating in Percentage, %
100
Fig.2 - Pulse Derating Curve
75
10
50
1.0
25
0.1
0.1ì
1.0ì
10ì
100ì
1.0m
10m
0
0
25
50
75
100
125
150 175
200
Pulse Width, td ( Sec)
Ambient Temperature, T
A
(°C)
Fig.3 - Pulse Waveform
150
Peak Pulse Current, I
PPM
(%)
tr=10ìS
Junction Capacitance, C
J
(pF)
pulse width (td) is defined
as the point where the peak
current decays to 50%
10,000
Fig.4 - Typical Junction Capacitance
uni-directional
bi-directional
V
R
=0
1,000
V
R
=rated
stand-off
voltage
100
T
J
=25°C
f=1.0MHz
Vsig=50mVp-p
10
1.0
10
100
Breakdown Voltage, V
BR
(Volts)
500
100
peak value I
PPM
half value I
PPM
/2
10/1000
ìS
waveform
50
td
0
0
1.0
2.0
time, t (mS)
3.0
4.0
http://www.formosams.com/
TEL:886-2-22696661
FAX:886-2-22696141
Document ID
Issued Date
2009/08/10
Revised Date
-
Revision
A
Page.
9
Page 4
DS-221826
SMD Transient Voltage Suppressor
5.0SMCJ Series
Formosa MS
Rating and characteristic curves (5.0SMCJ SERIES)
Fig.5 - Steady State Power Derating Curve
Steady State Power Dissipation (W)
8.0
400
Peak Forward Surge Current, I
FSM
(A)
60Hz resistive
or inductive load
Fig.6 - Maximum Non-Repetitive
Forward Surge Current
6.0
300
4.0
2.0
lead length
0.375" (9.5mm)
0.31" x 0.31" x 0.04"
(8x8x1mm)
copper heat sinks
200
0
0
25
50
75
100
125 150 175
200
100 1
10
Number of Cycles at 60Hz
100
Lead Temperature, T
L
(°C)
Fig. 7 - Transients of several thousand volts can be
clamped to a safe level by the TVS
Fig. 8 - Transient current is divered to ground thru
1 Introduction
In the mid-1960s, American scientist Maas conducted extensive experimental research on the charging process of open-cell batteries and proposed an acceptable charging curve for ...[详细]
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