參數(shù)資料
型號(hào)： HSMS-2863-TR2
廠商： AGILENT TECHNOLOGIES INC
元件分類： 參考電壓二極管
英文描述： SILICON, UHF-C BAND, MIXER DIODE
封裝： SOT-23, 3 PIN
文件頁(yè)數(shù)： 4/17頁(yè)
文件大?。?/td> 205K
代理商： HSMS-2863-TR2
12
Other configurations of six lead
Schottky products can be used to
solve circuit design problems
while saving space and cost.
Thermal Considerations
The obvious advantage of the
SOT-363 over the SOT-143 is
combination of smaller size and
two extra leads. However, the
copper leadframe in the SOT-323
and SOT-363 has a thermal
conductivity four times higher
than the Alloy 42 leadframe of the
SOT-23 and SOT-143, which
enables it to dissipate more
power.
The maximum junction tempera-
ture for these three families of
Schottky diodes is 150
°C under
all operating conditions. The
following equation, equation 1,
applies to the thermal analysis of
diodes:
Tj = (Vf If + PRF)
θ
jc + Ta
Equation (1).
where
Tj = junction temperature
Ta = diode case temperature
θ
jc = thermal resistance
Vf If = DC power dissipated
PRF = RF power dissipated
Note that
θ
jc, the thermal resis-
tance from diode junction to the
foot of the leads, is the sum of
two component resistances,
θ
jc =
θ
pkg +
θ
chip
Equation (2).
Package thermal resistance for
the SOT-323 and SOT-363 pack-
age is approximately 100
°C/W,
and the chip thermal resistance
for these three families of diodes
is approximately 40
°C/W. The
designer will have to add in the
thermal resistance from diode
case to ambient — a poor choice
of circuit board material or heat
sink design can make this number
very high.
Equation (1) would be straightfor-
ward to solve but for the fact that
diode forward voltage is a func-
tion of temperature as well as
forward current. The equation,
equation 3, for Vf is:
11600 (Vf – If Rs)
nT
If = IS e
– 1
Equation (3).
where
n = ideality factor
T = temperature in
°K
Rs = diode series resistance
and IS (diode saturation current)
is given by
2
1
n
– 4060
(
T
–
298)
Is = I0
( T ) e
298
Equation (4).
Equations (1) and (3) are solved
simultaneously to obtain the
value of junction temperature for
given values of diode case
temperature, DC power dissipa-
tion and RF power dissipation.
Diode Burnout
Any Schottky junction, be it an RF
diode or the gate of a MESFET, is
relatively delicate and can be
burned out with excessive RF
power. Many crystal video
receivers used in RFID (tag)
applications find themselves in
poorly controlled environments
where high power sources may be
present. Examples are the areas
around airport and FAA radars,
nearby ham radio operators, the
vicinity of a broadcast band
transmitter, etc. In such
environments, the Schottky
diodes of the receiver can be
protected by a device known as a
limiter diode.[6] Formerly
available only in radar warning
receivers and other high cost
electronic warfare applications,
these diodes have been adapted to
commercial and consumer
circuits.
Agilent offers a complete line of
surface mountable PIN limiter
diodes. Most notably, our HSMP-
4820 (SOT-23) or HSMP-482B
(SOT-323) can act as a very fast
(nanosecond) power-sensitive
switch when placed between the
antenna and the Schottky diode,
shorting out the RF circuit
temporarily and reflecting the
excessive RF energy back out the
antenna.
[6] Agilent Application Note 1050, Low Cost, Surface Mount Power Limiters.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HSMS-2863-TR2G 功能描述:射頻檢測(cè)器 4 VBR 0.3 pF RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel
HSMS-2864 制造商:AGILENT 制造商全稱:AGILENT 功能描述:Surface Mount Microwave Schottky Detector Diodes
HSMS-2864-BLKG 功能描述:射頻檢測(cè)器 4 VBR 0.3 pF RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel
HSMS-2864-TR1G 功能描述:射頻檢測(cè)器 4 VBR 0.3 pF RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel
HSMS-2864-TR2G 功能描述:射頻檢測(cè)器 4 VBR 0.3 pF RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel
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