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
Rating and characteristic curves (SMCJ SERIES)
Fig.1 - Pealk Pulse Power Rating Curve
Fig.2 - Pulse Derating Curve
Peak Pulse Power, P
PPM (KW)
100
non-repetitive
pulse waveform
shown in Fig. 3
T
A
=25°C
Peak Pulse Power or Current
Derating in Percentage, %
100
75
10
50
1.0
25
0.1
0.1μ
1.0μ
10μ
100μ
1.0m
10m
0
0
25
50
75
100
125
150 175
200
Pulse Width, td ( sec)
Ambient Temperature, T
A
(°C)
http://www.formosams.com/
TEL:886-2-22696661
FAX:886-2-22696141
Document ID
Issued Date
2008/02/10
Revised Date
2011/08/15
Revision
E
Page.
9
Page 4
DS-221802
Rating and characteristic curves (SMCJ SERIES)
Fig.3 - Pulse Waveform
tr=10μs
pulse width (td) is defined
as the point where the peak
current decays to 50%
Fig.4 - Typical Junction Capacitance
Peak Pulse Current, I
PPM (%)
150
Junction Capacitance, C
J (pF)
100000
10000
1000
100
Bi-directional
@V
RWM
Bi-directional
@
zero bias
Uni-directional
@
zero bias
Uni-directional
@V
RWM
100
peak value I
PPM
half value I
PPM
/2
10/1000 μs
waveform
50
10
1
1
td
0
0
1.0
2.0
3.0
4.0
TJ=25ºC
f=1.0MHz
time, t (ms)
10
100
1000
Breakdown Voltage, V
BR
(Volts)
Peak Forward Surge Current, I
FSM
(A)
Steady State Power Dissipation
(W)
Fig.5 - Steady State Power Derating Curve
5.0
4.0
3.0
2.0
1.0
0
mounted on
0.31"x0.31" (8x8mm)
copper pads to
each terminal
0
25
50
75
100
125
150 175
200
60Hz resistive
or inductive load
Fig.6 - Maximum Non-Repetitive
Forward Surge Current
200
100
T
J
=T
J
max.
8.3ms single half sine-wave
10 uni-directional devices only
1
10
100
Lead Temperature, T
L
(°C)
Number of Cycles at 60Hz
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
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