Datasheet

6
TransGuard
®
AVX Multilayer Ceramic Transient Voltage Suppressors
Multilayer construction and improved grain structure result in
excellent transient clamping characteristics up to 20 amps
peak current, while maintaining very low leakage currents
under DC operating conditions. The VI curves below show the
voltage/current characteristics for the 5.6V, 9V, 14V, 18V and
low capacitance StaticGuard parts with currents ranging from
parts of a micro amp to tens of amps.
Traditionally varistors have suffered degradation of electrical
performance with repeated high current pulses resulting in
decreased breakdown voltage and increased leakage cur-
rent. 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 TransGuard
®
tran-
sient voltage suppressors with 150Amp peak 8 x 20μS
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.
TYPICAL PERFORMANCE CURVES (0402 CHIP SIZE)
VOLTAGE/CURRENT CHARACTERISTICS PULSE DEGRADATION
VC04LC18V500
VC040214X300
VC040218X400
VC040205X150
VC040209X200
100
80
60
40
20
0
10
-9
10
-7
10
-5
10
-3
10
-1
10 10
3
10
5
Current (A)
Voltage (V)
VC04LC18V500
VC040214X300
VC040218X400
VC040205X150
VC040209X200
10 100 1000 10000
8kV ESD STRIKES
BREAKDOWN VOLTAGE (Vb)
35
30
25
20
15
10
5
VC040205X
VC04LC18V
VC040214X
VC040218X
VC040209X
0
-5
-10
-15
-20
-25
0.01 0.1 1 10
Frequency (GHz)
dB
VC04LC18V500
VC040214X300
VC040218X400
VC040205X150
VC040209X200
1300
1200
10 100 1000
IMPULSE DURATION (μS)
PEAK POWER (W)
1100
1000
900
800
700
600
500
400
300
200
100
0
PEAK POWER VS PULSE DURATION
INSERTION LOSS CHARACTERISTICS
ESD TEST OF 0402 PARTS