SWITCHING DIODE 1SS355
A Switching Diode 1SS355 is suitable for switching a small signal of up to 100 mA, acting as a rectifier. In contrast, a rectifier diode is used for AC line rectification (from alternating current to direct current). Switching diodes are designed to handle a voltage of less than tens of volts. Those in small surface-mount packages are widely used.
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A Switching Diode 1SS355 is suitable for switching a small signal of up to 100 mA, acting as a rectifier. In contrast, a rectifier diode is used for AC line rectification (from alternating current to direct current). Switching diodes are designed to handle a voltage of less than tens of volts. Those in small surface-mount packages are widely used.
Benefits of SWITCHING DIODE 1SS355
Turn-on time
Turn-on time is the time required to turn on the switch from switching diode from the cut-off . We require this time to be short so that appliances start working as soon as they are turned on. Therefore, we use appliances with minimum turn-on time.
Reverse Recovery Time
Once a diode has been turned on then it may require some time to go to the 'OFF' state. The time required by a diode from going to 'OFF' state from 'ON' state is known as reverse recovery time of the diode. The reverse recovery time of diode is usually larger than the turn on time.
Switching Time
Switching Time is defined as the sum of turn-on time & reverse recovery time. The speed of switching from one state to the other state is quite fast in the diodes. If we compare two materials then we can say that Ge has a reverse recovery time of .few hundred nanoseconds whereas silicon diodes have a reverse-recovery time of few nanoseconds.
Working principle of Switching Diode 1SS355
When the semiconductor diode is turned on, it is equivalent to the switch being closed (the circuit is turned on). When it is turned off, it is equivalent to the switch being opened (the circuit is turned off). Due to the unidirectional conduction characteristics of semiconductor diodes, the PN junction is turned on under positive bias, and the resistance in the on-state is very small, about tens to hundreds of ohms; under reverse bias, it is turned off, and its resistance is very large. The general silicon diode is above 10MΩ, and the germanium tube also has tens of thousands of ohms to hundreds of thousands of ohms. Using this feature, the diode will play a role in controlling the current on or off in the circuit, making it an ideal electronic switch.
Switching Diode 1SS355, the most important feature is the performance at high frequencies. Under high-frequency conditions, the barrier capacitance of the diode exhibits extremely low impedance and is connected in parallel with the diode. When the capacitance of this barrier capacitor reaches a certain level, it will seriously affect the switching performance of the diode. Under extreme conditions, the diode will be short-circuited. High-frequency current no longer passes through the diode, but directly bypasses the barrier capacitance, and the diode fails. The barrier capacitance of the switching diode is generally very small, which is equivalent to blocking the path of the barrier capacitance, which achieves the effect of maintaining good unidirectional conductivity under high frequency.
How to Measure the Good and Bad Switching Diode 1SS355?
The polarity of the discriminator will be placed on the multimeter R × 100 files or R × 1k file, the two pens were connected to the two electrodes of the diode, and measured the result, After measuring a result, adjust the two pens, and then measure a result. One of the two measurements has a higher resistance (reverse resistance) and one has a lower resistance (forward resistance).
In the smaller resistance value of a measurement, the black pen is connected to the positive terminal of the diode, the red pen is connected to the negative terminal of the diode.
Single negative conductivity detection and good or bad judgment usually, the germanium material diode forward resistance value of about 1kΩ, reverse resistance value of about 300. Silicon material diode resistance value of about 5 kΩ, the reverse resistance value of ∞ (infinity). The smaller the forward resistance the better, the greater the reverse resistance the better. The difference between the positive and negative resistance values is more significant.
If the measured diode's positive and reverse resistance values are close to 0 or the resistance value is small, it means that the diode has an internal breakdown short circuit or leakage damage.
If the measured diode positive and reverse resistance values are infinity, it means that the diode has been open circuit damage. Reverse breakdown voltage detection diode reverse breakdown voltage (withstand voltage value) can be measured with transistor DC parameters test table. The method is: when measuring the diode, the test table should be "NPN/PNP" selection key set to NPN state, and then the positive terminal of the diode under test to the test table "C" jack, the negative terminal into the test table " e" jack, and then press the "V (BR)" key, the test table can indicate the reverse breakdown voltage value of the diode.
Megohmmeter and multimeter can also be used to measure the reverse breakdown voltage of the diode, measurement when the negative terminal of the diode under test is connected to the positive terminal of the megohmmeter, the positive terminal of the diode is connected to the negative terminal of the megohmmeter, while using the multimeter (placed in the appropriate DC voltage file) to monitor the voltage across the diode. Shake the megohmmeter handle (should be slow and gradually accelerated), to be stable and no longer rising voltage at both ends of the diode, this voltage value is the reverse breakdown voltage of the diode.
The characteristics of switching diodes mainly include the following.
· Turn-on time
The time taken to turn on the switching diode from the cut-off is known as turn-on time. When this time is shorter then it is better.
· Reverse Recovery Time
Once the switching diode is activated then the forward voltage can be detached. The required time for the switching diode to off from ON is known as the reverse recovery time. In general, this time is greater as compared to the turn-on time.
· Switching Time
The switching time is the sum of both the turn-on time & reverse recovery time.
The switching diode's switching speed is quite fast. The reverse recovery time of the Ge switching diode is a few hundred nanoseconds whereas the Si switching diode has a few nanoseconds.
Once the forward voltage is provided to the two terminals of the switch, then the switching diode is said to be it is in the on-state, so that is equal to the ON state of the switch. Similarly, when a reverse voltage is provided to this diode, then the diode is said to be it is in the off state, which is equal to the OFF state of the switch.
The switching diode uses this main feature for faster and better switching speed characteristics, smaller internal resistance throughout conduction, higher resistance once-off & the small junction capacitance of the PN-junction.
Switching Diode 1SS355 are rugged and efficient. They are also expected to be relatively trouble free. Protective encapsulation processes and special coating techniques have even further increased their life expectancies. In theory, a diode should last indefinitely. However, if diodes are subject to current overloads, their junctions will be damaged or destroyed. In addition, the application of excessively high operating voltages can damage or destroy junctions through arc-over, or excessive reverse currents. One of the greatest dangers to the diode is heat. Heat causes more electron-hole pairs to be generated, which in turn increases current flow. This increase in current generates more heat and the cycle repeats itself until the diode draws excessive current. This action is referred to as THERMAL RUNAWAY and eventually causes diode destruction. Extreme caution should be used when working with equipment containing diodes to ensure that these problems do not occur and cause irreparable diode damage.
The following is a list of some of the special safety precautions that should be observed when working with Switching Diode 1SS355:
· Never remove or insert a diode into a circuit with voltage applied.
· Never pry diodes to loosen them from their circuits.
· Always be careful when soldering to ensure that excessive heat is not applied to the diode.
· When testing a diode, ensure that the test voltage does not exceed the diode's maximum allowable voltage.
· Never put your fingers across a signal diode because the static charge from your body could short it out.
· Always replace a diode with a direct replacement, or with one of the same type.
· Ensure a replacement diode is put into a circuit in the correct direction.
Basic Continuity Test on a Switching Diode 1SS355
Performing a basic continuity test on a diode is a simple process that can help you determine if the diode is functioning correctly. Here are the steps to follow:
• Turn off the power supply to the circuit and disconnect any wires or components that are in connection with the diode.
• Set your multimeter to the continuity testing mode. A symbol resembling a sound wave usually indicates the availability of this mode.
• Connect the black test lead to the COM port and the red test lead to the VΩ port on the multimeter.
• Touch the black test lead to the cathode (the end of the diode with the stripe) and the red test lead to the anode (the end of the diode without the stripe).
• Check the multimeter display. If the diode is functioning correctly, the multimeter should beep or show a reading of zero ohms. If the diode is faulty or damaged, the multimeter will not beep and may show a reading of infinity.
Reverse the test leads and touch the black lead to the anode and the red lead to the cathode.
• Check the multimeter display again. If the diode is functioning correctly, the multimeter will not beep and may show a reading of infinity. If the diode is faulty or damaged, the multimeter will not beep and may show a reading of zero ohms.
• And if the diode passes the continuity test in both directions, it is likely functioning correctly. However, a basic continuity test only checks for a low-resistance path through the diode, and it does not provide information about the diode's voltage drop or other characteristics.
What to Look for When Replacing a Switching Diode 1SS355?
When replacing a diode, always read the datasheets and pay attention to the following parameters:
· Type: Ensure the replacement diode is of the same type and has similar electrical characteristics as the faulty diode.
· Forward Voltage: Match the forward voltage rating closely to the original diode. Using a diode with a significantly different forward voltage may affect circuit performance.
· Reverse Voltage (Zener): Pay attention to the reverse voltage rating. That's the most important parameter for Zener diodes.
· Power Rating: Match or exceed the power rating of the replacement diode with the original diode.
· Package Type: Choose a replacement diode with a compatible package type and size. Different packages have different mounting and pin configurations. If space is not a concern, you can use any size as it won't affect the circuit behavior.
· Reverse Recovery Time: In high-frequency applications, the reverse recovery time of the diode is crucial. Ensure the replacement diode has a similar or faster reverse recovery time.
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TRR Electronics Co.,Ltd is one state capital hold controlling interest enterprise which make research, develop, manufacture and sell semiconductor discrete components and products as main operating business. We are subsidiary of A-shares quoted company 600059 and found in 2000,Toexpand oversea market business, Established subsidiary Guangdong TRR Electronics Co., Ltd.
TRR shares has multiply areas core technologies in wafer, package, apparatus test and application design, etc, we devote into research, manufacture, sell and application scheme design in new type components, already obtained more than 80 national authorized invent patents, include the general MB10F bridge in power supply industry, LED industry used UMB10F / B7 bridge, the globe smallest bridge IBS and series high junction temperature products.
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