Catalogue AVX Transient Suppression Products
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TransGuard®
AVX Multilayer Ceramic Transient Voltage Suppressors
TYPICAL PERFORMANCE CURVES (0603, 0805, 1206 & 1210 CHIP SIZES)
PULSE DEGRADATION
Traditionally varistors have suffered degradation of electrical perfor­mance with repeated high current pulses resulting in decreased breakdown voltage and increased leakage current. It has been suggested that irregular intergranular boundaries and bulk material result in restricted current paths and other non-Schottky barrier paralleled conduction paths in the ceramic. Repeated pulsing of both 5.6 and 14V TransGuard transient voltage suppressors with
150 Amp peak 8 x 20uS waveforms shows negligible degradation in breakdown voltage and minimal increases in leakage current. This does not mean that TransGuard suppressors do not suffer degradation, but it occurs at much higher current. The plots of typical breakdown voltage vs number of 150A pulses are shown below.
Repetitive Peak Current Strikes TransGuard 1210 1.5J Product
10% r
Repetitive Peak Current Strikes TransGuard 1206 0.4J Product
if 10% i
e )
CO
I
8%
8%
6%
6%
s
o :□
O
cö CD
2Ü
M21018J390
4%
4%
2%
2%
0
)
CO
e )
CC
O
0%
0%
0
100
200 300 400 Number of Strikes
Figure 1
500
600
0
100
200 300 400
Number of Strikes
500
600
Figure 3
Repetitive Peak Current Strikes TransGuard 0805 0.1J and 0.3J Products
Repetitive Peak Current Strikes StaticGuard 0805 0.1J Product
— 30%
)e25%
CO
> 20%
e )
CO
sz o
s
CO 0
m
s
o
CD
15%
VC080518C400
10%
5%
VC08LC18A500
e )
CO
e )
CC
O
5%
0%
0%
0
100
200 300 400
Number of Strikes
500
600
0
100
200 300 400
Number of Strikes
500 600
Figure 2
Figure 4
CAPACITANCE/FREQUENC CHARACTERISTICS
TransGuard Capacitance vs Frequency 0603
100
TransGuard Capacitance vs Frequency 0805
100
TransGuard Capacitance vs Frequency 1206
100
^ 80
0
)
§ 60
o
I'
0
CJ)
§1
-£Z
O
0
o ' cö
"Ö
ce ;
Q. CO
Ü
VC080505C150
0
)
§ 1
-£Z Ü
0
Ü '
.£3 "Ö
CO '
Q.
CO
Ü
0 o
'Ö
Q.
Ü
VC060305A150
VC080518C400 VC080514A300
VC06LC18X500
0
0
VC060326A580
60
80
100
60
80
100
Frequency (MHz)
Frequency (MHz)
Frequency (MHz)
/aW<
10
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