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 (3.0SMCJ SERIES)
Fig.1 - Pealk Pulse Power Rating Curve
Fig.2 - Pulse Derating Curve
Peak Pulse Power, P
PPM (KW)
100
Peak Pulse Power or Current
Derating in Percentage, %
100
75
10
50
1.0
0.1
0.1u
non-repetitive
pulse waveform
shown in Fig. 3
T
A
=25°C
1.0u
10u
100u
1.0m
10m
25
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
2013/03/01
Revision
D
Page.
9
Page 4
DS-221815
Rating and characteristic curves (3.0SMCJ SERIES)
Peak Pulse Current, I
PPM (%)
150
tr=10us
pulse width (td) is defined
as the point where the peak
current decays to 50%
Junction Capacitance, C
J (pF)
Fig.3 - Pulse Waveform
Fig.4 - Typical Junction Capacitance
Bi
-
directional
@zero bias
Uni
-
directional
@zero bias
Uni
-
directional
@
V
RWM
100
peak value I
PPM
half value I
PPM
/2
10/1000 us waveform
50
Bi
-
directional
@
V
RWM
TJ
=
25ºC
f
=
1
.
0MHz
td
0
0
1.0
2.0
3.0
4.0
time, t (ms)
Breakdown Voltage, V
BR
(Volts)
Peak Forward Surge Current, I
FSM
(A)
Steady State Power Dissipation
(W)
Fig.5 - Steady State Power Derating Curve
8.0
300
Fig.6 - Maximum Non-Repetitive
Forward Surge Current
60Hz resistive
or inductive load
6.0
200
4.0
2.0
lead length
0.375 (9.5mm)
0.31x0.31x0.04
(8x8x1mm)
copper heat sinks
0
25
50
75
100
125
150 175
200
100
0
01
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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Embedded System
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