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AntennaGuard 0402/0603
AVX Multilayer Ceramic Transient Voltage Suppressors
ESD Protection for Antennas and Low Capacitor Loading Applications
Antenna varistors offer excellent ESD repetitive strike capa-
bility compared to a SOT23 diode when subjected to IEC
61000-4-2 8Kv contact discharge. A performance summary
is shown in Figure 2.
ESD TEST OF ANTENNAGUARD RATINGS
ANTENNA VARISTOR S21
0
-5
VC04AG183R0
VC06AG183R0
520
70
-10
VC06AG18120
0603 - 12pF
500
60
-15
480
460
0603 - 3pF
50
40
-20
440
420
30
20
-25
-30
400
10
0.01
0.1
Frequency (GHz)
1.0
10
0402 - 3pF
Figure 5. Antenna vs Frequency
380
0
? 100 1000
8kV ESD Strikes
0
10,000
Typical implementations of the antenna varistors are shown
for use in cell phone, pager and wireless LAN applications in
Figure 2. Repetitive 8kV ESD Strike
Antenna varistors also turn on and divert ESD overvoltages
at a much faster rate than SOT23 devices (typically 300pS
vs 1500pS - 5000pS). See Figure 3.
PEAK
Figures 6A, 6B and 6C.
FET
100%
90%
30ns
SITVS TURN ON TIME
1.5nS to 5nS
2.2pF
2.7pF
Figure 6A. Cell Phone
60ns
MLV
1ns
TIME (ns)
30ns
60ns
TURN ON TIME
300pS to 700pS
Figure 3. Turn On Time
The equivalent circuit model for a typical antenna varistor is
shown in Figure 4.
L n
L n = BODY INDUCTANCE
12pF
R V
R I
C 1 = DEVICE CAPACITANCE
C 1
R V = VOLTAGE VARIABLE RESISTOR
R I = INSULATION RESISTANCE
Figure 4. Antenna Varistor
Figure 6B. Pager
The varistor shown exhibits a capacitance of ≤3pF which
can be used to replace the parallel capacitance typically
found prior to the antenna output of an RF amplifier. In the
off state, the varistor acts as a capacitor and helps to filter
RF output. The varistor is not affected by RF output power
or voltage and has little insertion loss. See Figure 3.
3pF
Varistor
Figure 6C.
FET
53
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