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Anonymous users2024-02-061. The maximum rectification current if refers to the diode.
The maximum forward average current that is allowed to pass through long-term operation. Because the current passes through the p-n junction.
To cause the diode to heat up, the current is too large and the heat is generated.
If the limit is exceeded, the PN will burn out.
2. The rated forward working current refers to the maximum forward current value allowed to pass through the diode when it works continuously for a long time. When the current passes through the diode, the die heats up, and when the temperature exceeds the allowable limit (about 140 for silicon tubes and about 90 for germanium tubes), the die will overheat and be damaged. Therefore, the diode should not exceed the rated forward working current value of the diode in use.
3. When the maximum reverse working voltage is added to the reverse voltage at both ends of the diode to a certain value, the diode will break down and lose the unidirectional conductivity. In order to ensure safe use, the maximum reverse operating voltage value is specified. Reverse breakdown voltage.
VBR refers to the voltage value of the diode when it is reversed through breakdown. During breakdown, the reverse current increases dramatically, and the unidirectional conductivity of the diode is destroyed, or even burned out due to overheating. The maximum reverse operating voltage given in the general manual is about half of the breakdown voltage to ensure safe operation of the diode.
The above is provided by MDD Chenda Electronics.
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Anonymous users2024-02-05The main parameters of the diode: IDM maximum rectifier current, URM maximum reverse voltage, reverse saturation current IS, maximum working frequency FM, on-voltage ud.
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Anonymous users2024-02-04There are four main parameters of a diode, namely the maximum forward current, the maximum reverse current, the highest reverse working voltage and the highest operating frequency.
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Anonymous users2024-02-03Different diodes have different parameters. For example, TVS transient suppression diode, the specific parameters are: cut-off voltage, clamping voltage, breakdown voltage, leakage current, peak pulse current, peak pulse power, capacitance value, package form, etc.
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Anonymous users2024-02-021. Conduction voltage drop VF: VF is the voltage drop at both ends of the diode when the diode is forward conducted, when the current through the diode is larger, the VF is larger; When the diode temperature is higher, the vf is smaller.
2. Reverse saturation leakage current IR: IR refers to the current flowing through the diode when the reverse voltage is added at both ends of the diode, Schottky diode.
The reverse leakage current is large, and the choice of Schottky diode is to choose a diode with a smaller IR as much as possible.
3. Rated current.
if: refers to the average current value of the Schottky diode converted according to the allowable temperature rise during long-term operation.
The above is provided by MDD Chenda Electronics.
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Anonymous users2024-02-011. Turn-on voltage drop VF: VF is the voltage drop at both ends of the diode when the diode is forward conducted, when the current through the diode is larger, the greater the VF; When the diode temperature is higher, the vf is smaller.
2. Reverse saturation leakage current IR: IR refers to the current flowing through the diode when the reverse voltage is added at both ends of the diode, and the reverse leakage current of the Schottky diode is larger.
3. Forehead Waiting Current IF: refers to the average current value converted according to the allowable temperature rise of the Schottky diode during long-term operation.
The above is provided by MDD Chenda Electronics.
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Anonymous users2024-01-31The diode parameters of each brand model are different, but each first ear potato model manufactured by the manufacturer will have a corresponding parameter table, and some commonly used diode models have similar parameter values, different brands, and of course there are differences in performance.
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Anonymous users2024-01-301. Parameters: CT--- barrier capacitance, CJ --- junction () capacitor; It indicates the detection diode capacitor, CJV --- bias junction capacitor, and CO--- zero bias voltage under the specified bias voltage at both ends of the diode.
2. The capacitance is used to express the technical indicators of the diode's performance and application range, which are called the parameters of the diode. Different types of diodes have different characteristic parameters. Volt-ampere characteristics:
The diode has unidirectional conductivity, the volt-ampere characteristic curve of the diode, and the volt-ampere characteristic curve of the diode.
3. Volt-ampere characteristic curve of the diode. When the voltage value is small, the electric dry current is very small; When the voltage is exceeded, the current begins to increase exponentially, which is usually called the turning on voltage of the diode; When the voltage reaches about that, the diode is in a fully conductive state, which is usually called the on-voltage of the diode, which is represented by the symbol ud.
4. For germanium diodes, the turn-on voltage is and the on-voltage ud is about. When the voltage value is small, the current is very small, and its current value is the reverse saturation current is. When the reverse voltage exceeds a certain value, the current begins to increase sharply, which is called the reverse breakdown before the early time, and this voltage is called the reverse breakdown voltage of the diode, which is represented by the symbol UBR.
The breakdown voltage UBR value varies greatly from tens of volts to several thousand volts for different types of diodes.
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Anonymous users2024-01-29The main performance parameters of the diode are the maximum rectifier current IF, the maximum reverse working voltage UDRM, the reverse current IDRM, the dynamic resistance RD, the maximum working frequency FM, and the voltage temperature coefficient. The details are as follows:
1. The maximum rectifier current is if
IF is a special parameter symbol for diode parameters, which refers to the maximum positive average current value allowed to pass through the diode when it works continuously for a long time, and its value is related to the PN junction area and external heat dissipation conditions. (as shown in the image below).
2. The highest reverse working voltage UDRM
When the reverse voltage applied to both ends of the diode reaches a certain value, the tube will break down and lose the ability to conduct electricity unilaterally. In order to ensure the safety of use, the maximum reverse operating voltage value is specified. (as shown in the image below).
3. Reverse current IDRM
Reverse current refers to the reverse current that flows through the diode at room temperature and the highest reverse voltage. The smaller the reverse current, the better the unidirectional conductivity of the tube. (as shown in the image below).
4. Dynamic resistance rd
The ratio of the change of the voltage near the static operating point q of the diode characteristic curve to the change of the corresponding current is a wide mode. (as shown in the image below).
5. The maximum working frequency is fm
fm is the upper limit frequency at which the diode operates. Since a diode is the same as a PN junction, its junction capacitance is composed of barrier capacitance. (as shown in the image below).
6. Voltage temperature coefficient uz
uz is the relative change in the steady and gentle voltage for every one degree Celsius increase in temperature. The temperature stability of the Zener diode with a UZ of about 6V is good. (as shown in the image below).
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The inventor of the vacuum triode was the American scientist Lee de Forest (1873 - 1961). In 1904, Fleming invented the first electron tube by adding a plate pole in front of the wire (filament) heated in a vacuum He called this kind of electron tube with two poles diode Using the newly invented electron tube, the current can be rectified, so that the ** receiver or other recording device can work Nowadays, when we turn on an ordinary tube radio, we can easily see the tube with the filament burned red It is the heart of the work of electronic equipment and the starting point of the development of the electronics industry.
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