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參數(shù)資料
| 型號： | HBAT-540C-BLKG |
| 廠商： | AGILENT TECHNOLOGIES INC |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | UNIDIRECTIONAL, 2 ELEMENT, SILICON, TVS DIODE |
| 封裝： | LEAD FREE, SC-70, 3 PIN |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 112K |
| 代理商： | HBAT-540C-BLKG |
6
Applications Information
Schottky Diode Fundamentals
The HBAT-540x series of clipping/
clamping diodes are Schottky
devices. A Schottky device is a
rectifying, metal-semiconductor
contact formed between a metal
and an n-doped or a p-doped
semiconductor. When a metal-
semiconductor junction is formed,
free electrons flow across the
junction from the semiconductor
and fill the free-energy states in
the metal. This flow of electrons
creates a depletion or potential
across the junction. The differ-
ence in energy levels between
semiconductor and metal is called
a Schottky barrier.
P-doped, Schottky-barrier diodes
excel at applications requiring
ultra low turn-on voltage (such as
zero-biased RF detectors). But
their very low, breakdown-voltage
and high series-resistance make
them unsuitable for the clipping
and clamping applications involv-
ing high forward currents and high
reverse voltages. Therefore, this
discussion will focus entirely on
n-doped Schottky diodes.
Under a forward bias (metal
connected to positive in an
n-doped Schottky), or forward
voltage, V
F
, there are many
electrons with enough thermal
energy to cross the barrier poten-
tial into the metal. Once the
applied bias exceeds the built-in
potential of the junction, the
forward current, I
F
, will increase
rapidly as V
F
increases.
When the Schottky diode is
reverse biased, the potential
barrier for electrons becomes
large; hence, there is a small
probability that an electron will
have sufficient thermal energy to
cross the junction. The reverse
leakage current will be in the
nanoampere to microampere
range, depending upon the diode
type, the reverse voltage, and the
temperature.
In contrast to a conventional p-n
junction, current in the Schottky
diode is carried only by majority
carriers. Because no minority
carrier charge storage effects are
present, Schottky diodes have
carrier lifetimes of less than
100 ps and are extremely fast
switching semiconductors.
Schottky diodes are used as
rectifiers at frequencies of 50 GHz
and higher.
Another significant difference
between Schottky and p-n diodes
is the forward voltage drop.
Schottky diodes have a threshold
of typically 0.3 V in comparison to
that of 0.6 V in p-n junction
diodes. See Figure 6.
P
N
CURRENT
0.6V
+
–
BIAS VOLTAGE
PN JUNCTION
CAPACITANCE
METAL
N
CURRENT
0.3V
+
–
BIAS VOLTAGE
SCHOTTKY JUNCTION
CAPACITANCE
Figure 6.
Through the careful manipulation
of the diameter of the Schottky
contact and the choice of metal
deposited on the n-doped silicon,
the important characteristics of
the diode (junction capacitance,
C
J
; parasitic series resistance, R
S
;
breakdown voltage, V
BR
; and
forward voltage, V
F
,) can be
optimized for specific applica-
tions. The HSMS-270x series and
HBAT-540x series of diodes are a
case in point.
Both diodes have similar barrier
heights; and this is indicated by
corresponding values of satura-
tion current, I
S
. Yet, different
contact diameters and epitaxial-
layer thickness result in very
different values of junction
capacitance, C
J
and R
S
. This is
portrayed by their SPICE param-
eters in Table 1.
Table 1. HBAT-540x and
HSMS-270x SPICE Parameters.
HBAT-
540x
40 V
3.0 pF
0.55 eV
10E-4 A
1.0E-7 A
1.0
2.4
0.6 V
2
0.5
HSMS-
270x
25 V
6.7 pF
0.55 eV
10E-4 A
1.4E-7 A
1.04
0.65
0.6 V
2
0.5
Parameter
BV
CJ0
EG
IBV
IS
N
RS
PB
PT
M
At low values of I
F
≤
1 mA, the
forward voltages of the two
diodes are nearly identical.
However, as current rises above
10 mA, the lower series resistance
of the HSMS-270x allows for a
much lower forward voltage. This
gives the HSMS-270x a much
higher current handling capability.
The trade-off is a higher value of
junction capacitance. The forward
voltage and current plots illustrate
the differences in these two
Schottky diodes, as shown in
Figure 7.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HBAT-540C-BLKG | 制造商:Avago Technologies 功能描述:Diode |
| HBAT-540C-TR1 | 功能描述:DIODE SCHOTTKY 30V 430MA SOT-323 RoHS:否 類別:分離式半導體產(chǎn)品 >> RF 二極管 系列:- 標準包裝:3,000 系列:- 二極管類型:PIN - 單 電壓 - 峰值反向(最大):50V 電流 - 最大:50mA 電容@ Vr, F:0.4pF @ 50V，1MHz 電阻@ Vr, F:4.5 歐姆 @ 10mA，100MHz 功率耗散（最大）:100mW 封裝/外殼:SC-70，SOT-323 供應商設備封裝:3-MCP 包裝:帶卷 (TR) |
| HBAT-540C-TR1G | 功能描述:肖特基二極管與整流器 430mA 825mW Series RoHS:否 制造商:Skyworks Solutions, Inc. 產(chǎn)品:Schottky Diodes 峰值反向電壓:2 V 正向連續(xù)電流:50 mA 最大浪涌電流: 配置:Crossover Quad 恢復時間: 正向電壓下降:370 mV 最大反向漏泄電流: 最大功率耗散:75 mW 工作溫度范圍:- 65 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-143 封裝:Reel |
| HBAT-540C-TR2 | 制造商:AGILENT 制造商全稱:AGILENT 功能描述:High Performance Schottky Diode for Transient Suppression |
| HBAT-540C-TR2G | 功能描述:肖特基二極管與整流器 430mA 825mW Series RoHS:否 制造商:Skyworks Solutions, Inc. 產(chǎn)品:Schottky Diodes 峰值反向電壓:2 V 正向連續(xù)電流:50 mA 最大浪涌電流: 配置:Crossover Quad 恢復時間: 正向電壓下降:370 mV 最大反向漏泄電流: 最大功率耗散:75 mW 工作溫度范圍:- 65 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-143 封裝:Reel |
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