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參數(shù)資料
| 型號： | HSMS-285A |
| 英文描述： | Surface Mount Microwave Schottky Detector Diodes in SOT-323(表貼型微波肖特基檢測二極管（SOT-323封裝）) |
| 中文描述： | 表面安裝微波肖特基二極管探測器采用SOT - 323（表貼型微波肖特基檢測二極管（采用SOT - 323封裝）） |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 117K |
| 代理商： | HSMS-285A |
10
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.
[8]
Formerly available only in
radar warning receivers and other
high cost electronic warfare
applications, these diodes have
been adapted to commercial and
consumer circuits.
Hewlett-Packard offers a complete
line of surface mountable PIN
limiter diodes. Most notably, our
HSMP-4820 (SOT-23) 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.
Assembly Instructions
SOT-323 PCB Footprint
A recommended PCB pad layout
for the miniature SOT-323 (SC-70)
package is shown in Figure 32
(dimensions are in inches). This
layout provides ample allowance
for package placement by auto-
mated assembly equipment
without adding parasitics that
could impair the performance.
[8]
Hewlett-Packard Application Note 1050,
Low Cost, Surface Mount Power Limiters.
TIME (seconds)
T
MAX
T
°
C
0
0
50
100
150
200
250
60
Preheat
Zone
Cool Down
Zone
Reflow
Zone
120
180
240
300
Figure 33. Surface Mount Assembly Profile.
0.026
0.035
0.07
0.016
Figure 32. PCB Pad Layout
( dimensions in inches) .
SMT Assembly
Reliable assembly of surface
mount components is a complex
process that involves many
material, process, and equipment
factors, including: method of
heating (e.g., IR or vapor phase
reflow, wave soldering, etc.)
circuit board material, conductor
thickness and pattern, type of
solder alloy, and the thermal
conductivity and thermal mass of
components. Components with a
low mass, such as the SOT-323
package, will reach solder reflow
temperatures faster than those
with a greater mass.
HP’s SOT-323 diodes have been
qualified to the time-temperature
profile shown in Figure 33. This
profile is representative of an IR
reflow type of surface mount
assembly process.
After ramping up from room
temperature, the circuit board
with components attached to it
(held in place with solder paste)
passes through one or more
preheat zones. The preheat zones
increase the temperature of the
board and components to prevent
thermal shock and begin evaporat-
ing solvents from the solder paste.
The reflow zone briefly elevates
the temperature sufficiently to
produce a reflow of the solder.
The rates of change of tempera-
ture for the ramp-up and cool-
down zones are chosen to be low
enough to not cause deformation
of the board or damage to compo-
nents due to thermal shock. The
maximum temperature in the
reflow zone (T
MAX
) should not
exceed 235
°
C.
These parameters are typical for a
surface mount assembly process
for HP SOT-323 diodes. As a
general guideline, the circuit board
and components should be exposed
only to the minimum temperatures
and times necessary to achieve a
uniform reflow of solder.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HSMS-286A | Surface Mount Microwave Schottky Detector Diodes in SOT-323(表貼型微波肖特基檢測二極管（SOT-323封裝）) |
| HSMS-286K | Surface Mount RF Schottky Detector Diodes in SOT-363(表貼型射頻肖特基檢測二極管（SOT-363封裝）) |
| HSMS-286L | Surface Mount RF Schottky Detector Diodes in SOT-363(表貼型射頻肖特基檢測二極管（SOT-363封裝）) |
| HSMS-286P | Surface Mount RF Schottky Detector Diodes in SOT-363(表貼型射頻肖特基檢測二極管（SOT-363封裝）) |
| HSMS-286R | Surface Mount RF Schottky Detector Diodes in SOT-363(表貼型射頻肖特基檢測二極管（SOT-363封裝）) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HSMS-285ASERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Surface Mount Microwave Schottky Detector Diodes in SOT-323 (SC-70) (155K in pdf) |
| HSMS-285B | 制造商:HP 制造商全稱:Agilent(Hewlett-Packard) 功能描述:Surface Mount Zero Bias Schottky Detector Diodes |
| HSMS-285B-BLK | 制造商:HP 制造商全稱:Agilent(Hewlett-Packard) 功能描述:Surface Mount Zero Bias Schottky Detector Diodes |
| HSMS-285B-BLKG | 功能描述:射頻檢測器 RF/ID below 1.5GHz 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-285B-G | 制造商:Avago Technologies 功能描述:HSMS-285B zero-bias Schottky detector |
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