VC04AG183R0YATWA [KYOCERA AVX]
Varistor, 18V, Surface Mount, CHIP, 0402, ROHS COMPLIANT;
| 型号： | VC04AG183R0YATWA |
| 厂家： | 
KYOCERA AVX |
| 描述： | Varistor, 18V, Surface Mount, CHIP, 0402, ROHS COMPLIANT 电阻器 |
| 文件： | 总4页 (文件大小：92K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AntennaGuard 0402/0603
AVX Multilayer Ceramic Transient Voltage Suppressors
ESD Protection for Antennas and Low Capacitor Loading Applications
GENERAL DESCRIPTION
RF antenna/RF amplifier protection against ESD events is
a growing concern of RF circuit designers today, given the
combination of increased signal “gain” demands, coupled with
the required downsizing of the transistor package. The ability to
achieve both objectives is tied to a reduced thickness of the
SiO2 gate insulator layer within the semiconductor. The
corresponding result of such a change increases the Power
Amplifier’s (PA’s) vulnerability to ESD strikes — a common event
with handheld electronic products with RF transmitting and/or
receiving features.
AVX’s 0402/0603 AntennaGuard products are an ultra-low
capacitance extension of the proven TransGuard TVS (transient
voltage suppression) line of multilayer varistors. RF designers
now have a single chip option over conventional protection
methods (passive filters with diode clamps), which not only gives
superior performance over traditional schemes, but also
provides the added benefits of reduced PCB real estate and
lower installation costs.
AVX’s AntennaGuard products are available in capacitance
ratings of ≤3pF (0402 & 0603 chips) and ≤12pF (0603 chip).
These low capacitance values have low insertion loss, as well as
give other TransGuard advantages such as small size,
sub-nanosecond response time, low leakage currents and
unsurpassed reliability (FIT Rate of 0.2) compared to diodes.
FEATURES
• Smallest TVS Component
• Standard EIA Chip Sizes
• Chip Placement Compatible
APPLICATION
• ESD Protection for RF Amplifiers
• Laser Drivers
• Fastest Response Time to
ESD Strikes
• Two Cap Values
(≤3 and ≤12pF)
HOW TO ORDER
VC
04
AG
18
3R0
Y
A
T
x
x
Varistor Chip Size Varistor Series Working Capacitance Non-Std.
Not
Termination
Reel
Reel
Chip 04 = 0402 AntennaGuard
Voltage
3pF = 3R0
Cap
Applicable T = Ni/Sn Alloy Size
Quantity
A = 4,000
or 10,000
06 = 0603
(DC)
12pF = 120 Tolerance
(Plated)
1 = 7"
(Maximum)
M = Ni/Sn Pb 3 = 13"
(Plated)
W = 7"
(0402 only)
(i.e., 1A = 4,000
3A = 10,000)
WA = 10,000
25
AntennaGuard 0402/0603
AVX Multilayer Ceramic Transient Voltage Suppressors
ESD Protection for Antennas and Low Capacitor Loading Applications
ANTENNAGUARD CATALOG PART NUMBERS/ELECTRICAL VALUES
AVX Part Number
VC04AG183R0YAT_ _
VC06AG183R0YAT_ _
VC06AG18120YAT_ _
VW (DC)
≤18
VW (AC)
≤14
IL
Cap
3
Case Size
0402
Elements
0.1
0.1
0.1
1
1
1
≤18
≤14
3
0603
≤18
≤14
12
0603
Termination Finish Code
Packaging Code
VW (DC) DC Working Voltage (V)
VW (AC) AC Working Voltage (V)
IL
Cap
Maximum Leakage Current at the Working Voltage (µA)
Maximum Capacitance (pF) @ 1 MHz and 0.ꢀ Vrms; VC06AG18120YAT capacitance tolerance: +4, -2pF
mm (inches)
PHYSICAL DIMENSIONS
0402
0603
Length
1.0 (0.039) 0.1 (0.004)
0.ꢀ (0.020) 0.1 (0.004)
0.6 Max. (0.024)
1.6 (0.063) 0.1ꢀ (0.006)
0.8 (0.031) 0.1ꢀ (0.006)
0.9 Max. (0.03ꢀ)
Width
Thickness
Termination Band Width
0.2ꢀ (0.010) 0.1ꢀ (0.006)
0.3ꢀ (0.014) 0.1ꢀ (0.006)
26
AntennaGuard 0402/0603
AVX Multilayer Ceramic Transient Voltage Suppressors
ESD Protection for Antennas and Low Capacitor Loading Applications
Antenna Varistors
AVX offers a series of 0402 and 0603 chip varistors,
designated the AntennaGuard series, for RF antenna/RF
amplifier protection. These devices offer ultra-low capaci-
tance (<3pF in 0402 chips, and ≤3pF & ≤12pF in 0603
packages), as well as low insertion loss. Antenna varistors
can replace output capacitors and provide ESD suppression
in cell phones, pagers and wireless LANs.
growing concern among RF designers due to the following
trends: (1) RF amplifiers continue to shrink in size, and (2)
FET gains figures continue to increase. Both trends relate to
decreasing gate oxide thickness, which in turn, is directly
proportional to increased ESD sensitivity. As miniaturization
trends accelerate, the traditional methods to protect against
ESD damage (i.e., PC board layout, passive filters, and diode
clamps) are becoming less and less effective.
It is very common to employ some form of a FET in many
types of efficient/miniature RF amplifiers. Typically, these RF
transistors have nearly ideal input gate impedance and
outstanding noise figures. However, FETs are very suscepti-
ble to ESD damage due to the very thin layer of SiO2 uses as
the gate insulator. The ultra-thin SiO2 layer is required to
improve the gain of the transistor. In other words, the upside
of the performance enhancement becomes the downside of
the transistors survival when subjected to an ESD event.
AVX’s AntennaGuard varistor can be used to protect the FET
and offer superior performance to the previously mentioned
protection methods given above. The standard EIA 0603
chip size, and particularly the 0402 chip, offer designers an
ESD protection solution consistent with today’s downsizing
trend in portable electronic products. Savings in component
volume up to 86%, and PC board footprint savings up to
83% are realistic expectations. These percentages are based
upon the following table and Figures 1A and 1B.
ESD damage to the RF Field Effect Transistors (FETs) is a
mm (inches)
Pad Dimensions
Suppression Device
D1
D2
D3
D4
D5
AVX 0402 TransGuard
AVX 0603 TransGuard
Competitor’s SOT23 Diode
1.70 (0.067)
2.ꢀ4 (0.100)
0.61 (0.024)
0.89 (0.03ꢀ)
0.ꢀ1 (0.020)
0.76 (0.030)
See Below
0.61 (0.024)
0.89 (0.03ꢀ)
0.ꢀ1 (0.020)
0.76 (0.030)
0.96
(0.037)
0.96
(0.037)
D2
D1
D3
D4
2.0
(0.079)
0.9
(0.035)
0.8
(0.031)
D5
mm (inch
Figure 1A. 0402/0603
IR Solder Pad Layout
Figure 1B. SOT23- Solder Pad Layout
27
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.
ANTENNA VARISTOR S21
0
-5
VC04AG183R0
VC06AG183R0
VC06AG18120
ESD TEST OF ANTENNAGUARD RATINGS
520
500
480
70
60
50
40
-10
0603 - 12pF
-15
-20
0603 - 3pF
460
440
420
400
380
-25
-30
30
20
10
0
0.01
0.1
1.0
10
Frequency (GHz)
Figure 5. Antenna vs Frequency
0402 - 3pF
0
100
1000
10,000
Typical implementations of the antenna varistors are shown
for use in cell phone, pager and wireless LAN applications in
Figures 6A, 6B and 6C.
8kV ESD Strikes
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 1ꢀ00pS - ꢀ000pS). See Figure 3.
FET
PEAK
100%
2.2pF
2.7pF
SITVS TURN ON TIME
90%
1.5nS to 5nS
30ns
Figure 6A. Cell Phone
60ns
1ns
30ns
60ns
TIME (ns)
MLV
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.
12pF
Ln
Ln = BODY INDUCTANCE
C1 = DEVICE CAPACITANCE
RV
RI
C1
RV = VOLTAGE VARIABLE RESISTOR
RI = 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.
FET
3pF
Varistor
Figure 6C.
28
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