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參數(shù)資料
| 型號： | HSMS-270P-BLKG |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | UNIDIRECTIONAL, 4 ELEMENT, SILICON, TVS DIODE |
| 封裝： | ROHS COMPLIANT, SC-70, 6 PIN |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 125K |
| 代理商： | HSMS-270P-BLKG |
8
Because the automatic, pick-and-place equipment used
to assemble these products selects dice from adjacent
sites on the wafer, the two diodes which go into the
HSMS-2702 or HSMS-270C (series pair) are closely
matched —without the added expense of testing and
binning.
Current Handling in Clipping/Clamping Circuits
The purpose of a clipping/clamping diode is to handle
high currents, protecting delicate circuits downstream
of the diode. Current handling capacity is determined
by two sets of characteristics, those of the chip or device
itself and those of the package into which it is mounted.
tained at a low limit even at high values of current.
Maximum reliability is obtained in a Schottky diode when
the steady state junction temperature is maintained at or
below 150°C, although brief excursions to higher junction
temperatures can be tolerated with no signicant impact
upon mean-time-to-failure, MTTF. In order to compute
the junction temperature, Equations (1) and (3) below
must be simultaneously solved.
0
0.1
0.2
0.3
0.5
0.4
V
F
–
FORWARD
VOLTAGE
(V)
IF – FORWARD CURRENT (mA)
0
3
2
1
6
4
5
Rs = 7.7
Rs = 1.0
IF = IS
e
–1
11600 (V F – IFRS)
n T J
(1)
IS = I0
e
T J
2 9 8
2
n
1
T J
1
2 9 8
– 4060
–
(2)
TJ = VFIF JC + TA
(3)
Figure 8. Two Schottky Diodes Are Used for Clipping/Clamping in a Circuit.
Consider the circuit shown in Figure 8, in which two
Schottky diodes are used to protect a circuit from noise
spikes on a stream of digital data. The ability of the diodes
to limit the voltage spikes is related to their ability to sink
the associated current spikes. The importance of current
handling capacity is shown in Figure 9, where the forward
voltage generated by a forward current is compared in
two diodes.
Figure 9. Comparison of Two Diodes.
The rst is a conventional Schottky diode of the type
generally used in RF circuits, with an RS of 7.7 Ω. The
second is a Schottky diode of identical characteristics,
save the RS of 1.0 Ω. For the conventional diode, the
relatively high value of RS causes the voltage across the
diode’s terminals to rise as current increases. The power
dissipated in the diode heats the junction, causing RS to
climb, giving rise to a runaway thermal condition. In the
second diode with low RS, such heating does not take
place and the voltage across the diode terminals is main-
where:
IF = forward current
IS = saturation current
VF = forward voltage
RS = series resistance
TJ = junction temperature
IO = saturation current at 25°C
n = diode ideality factor
θJC = thermal resistance from junction to case (diode
lead)
=
θpackage + θchip
TA = ambient (diode lead) temperature
Equation (1) describes the forward V-I curve of a Schottky
diode. Equation (2) provides the value for the diode’s satu-
ration current, which value is plugged into (1). Equation
(3) gives the value of junction temperature as a function
of power dissipated in the diode and ambient (lead)
temperature.
The key factors in these equations are: RS, the series resis-
tance of the diode where heat is generated under high
current conditions;
θchip, the chip thermal resistance of
the Schottky die; and
θpackage, or the package thermal
resistance.
RS for the HSMS-270x family of diodes is typically 0.7 Ω
and is the lowest of any Schottky diode available from
Avago. Chip thermal resistance is typically 40°C/W; the
thermal resistance of the iron-alloy-leadframe, SOT-23
package is typically 460°C/W; and the thermal resistance
of the copper-leadframe, SOT-323 package is typically
110°C/W. The impact of package thermal resistance on
the current handling capability of these diodes can be
seen in Figures 3 and 4. Here the computed values of
junction temperature vs. forward current are shown
current
limiting
pull-down
(or pull-up)
long cross-site cable
noisy data-spikes
Vs
0V
voltage limited to
Vs + Vd
0V – Vd
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HSMS-2800-TR2 | SILICON, MIXER DIODE |
| HSMS-280E-BLKG | SILICON, MIXER DIODE |
| HSMS-2805L31 | SILICON, MIXER DIODE |
| HSMS-2803L31 | SILICON, MIXER DIODE |
| HSMS-2862L31 | SILICON, MIXER DIODE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HSMS-270P-TR1G | 功能描述:肖特基二極管與整流器 15 VBR 6.7 pF 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:SOT-143 封裝:Reel |
| HSMS-270P-TR2G | 功能描述:肖特基二極管與整流器 15 VBR 6.7 pF 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:SOT-143 封裝:Reel |
| HSMS-2800 | 制造商:Avago Technologies 功能描述:DIODE SCHOTTKY RF SOT23 |
| HSMS-2800#L31 | 制造商:Avago Technologies 功能描述:Rectifier Diode, Schottky, 70 Volt, SOT-23 |
| HSMS-2800-BLKG | 功能描述:肖特基二極管與整流器 70 VBR 2 pF 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:SOT-143 封裝:Reel |
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