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SDISEMI has powerful design team, able to provide all of the electronic equipment/system provides protection electrostatic discharge (ESD), electrical fast transient (EFT), EMI and induction switch and destructive impact SDISEMI provide unique system solutions.
Want to know more of ESD application case column or about SDISEMI selection problem, we will thank you very much for your patience and mail to Support@sdisemi.com consultation.
ESD application common problem:
Question: as a circuit design engineer, when/why I should consider design a TVS protection device or insurance
Protecting network?
Answer: consider TVS protection device in a particular circuit/system used in the best time is in the initial stage of design.
This is because this can more easily use to plan the components for the appropriate space configuration, so usually in the beginning design
To be considered when rather than in the design is completed. In addition, it is more easy to estimate TVS device to signal and system performance of the shadow
Ring. Finally, current transient immunity standard (IEC or EN standard) require system/circuit with TVS protection.
Problem: for a given device, the system or circuit, I need to use multiple protection device?
Answer: yes. But need to use what protection device, this basically need to depend on transient threat environment, protection coordination (I
/ O port and power bus) and TVS device position. For example, there are three main threat environment: lightning (surge), electric
Fast transient (EFT) and electrostatic discharge (ESD). Any one of these threats can directly or indirectly induce equipment,
System or circuit in multiple interfaces problems. Therefore, all the interface need protection, it is need to use a variety of protection device.
Question: in printed circuit board (PCB) on two different grounding line between I need to use TVS protection device?
Answer: yes, in the PCB away from a common contact furthest point. In the circuit board level, usually between ground there will be some isolation (die
Quasi and digital). But in some of the connection point in the system, the two ground is common. In critical circumstances, circuit the low
Voltage difference must be maintained to prevent ground bounce (GPR), it will affect some sensitive IC components.
Problem: a protective device/network will affect the normal work of the circuit during the signal?
Answer: yes. TVS protection device or the network is connected between the in a circuit, can have the influence of insertion loss or lead to signal loss
True. These protection device/network selection is based on their capacity. In a given operating frequency, existing in the circuit
Other elements will affect the TVS device capacitance value. Therefore, in the circuit parasitic or transmission capacity to TVS device
Choice is a very important considerations.
Problem: hand-held devices need to momentary thunder and lightning threat of protection?
Answer: for the hand-held product environmental threat is mainly electrostatic discharge (ESD). However, when the product is placed on the stent charging or
Connected to the computer to carry on the download, it also can become susceptible should be struck by lightning and the possible electrical fast transient (EFT) influence.
Problem: a due to the line impedance mismatch cause reflection signals, can be removed by filtering?
Answer: can't. Filter is designed to filter out the design of low voltage noise. Reflected signal is usually two times the input pulse amplitude
And frequency. Therefore, it is recommended to use by TVS/filter combination of circuit to such high voltage at the same time reduce the residual noise.
Problem: low frequency and high frequency between the cutoff point is how much?
Answer: for TVS device choice, parting is in 10 to 30 MHz range. Low capacitance TVS device can be used for high
In the 30 MHz work frequency. The actual capacitance value will also depend on line or circuit of parasitic components
Question: when why we want to use different types of waveform (namely 10/1000 μ s, 8/20 μ s, etc.) ?
Answer: our TVS to choose to use what waveform to test is based on a system it need to meet the specific standard. waveform
Is an environmental threat of representation, also is the actual system test results. For example, 10/1000 μ s is long transmission line was ray
Strike waveform, 8/20 μ s is close to lightning point nearby waveform, 1/30 ns were in ESD waveform.
Some wave depends on the source of the threat. For example, ESD has 1/30 ns waveform and EFT have multiple volleying 5/50 ns waveform.
Question: for a pulse waveform description why use 50% of the attenuation to represent pulse time?
Answer: a pulse waveform can be used two ways to measure. The most common way is to 50% wave attenuation point measurement. this
50% wave attenuation point represents the waveform in the curve of the whole area.
Question: why is it said that the TVS protection device or protect the network capacity is very important parameter?
Answer: protection device capacitance will affect the circuit performance, insertion loss, reflection and signal integrity. As data transmission speed
Degree enhancement, TVS protection device or protect the network's capacity to become more concern.
Question: how do I know should be for the use of TVS protection device or protect the network configuration how much space?
Answer: for a given waveform, transient threat from standard voltage, current, or both to define the transient conditions.
Therefore, the use of selected TVS device or protect the network needs matching a given waveform peak pulse current threats. if
Fruit a low capacitance TVS protection device is necessary, these devices usually has a bit more largish package size. Small seal
Loading, such as flip chip, general enough for ESD transients and low frequency application.
Want to know more of ESD application case column or about SDISEMI selection problem, we will thank you very much for your patience and mail to Support@sdisemi.com consultation.
ESD application common problem:
Question: as a circuit design engineer, when/why I should consider design a TVS protection device or insurance
Protecting network?
Answer: consider TVS protection device in a particular circuit/system used in the best time is in the initial stage of design.
This is because this can more easily use to plan the components for the appropriate space configuration, so usually in the beginning design
To be considered when rather than in the design is completed. In addition, it is more easy to estimate TVS device to signal and system performance of the shadow
Ring. Finally, current transient immunity standard (IEC or EN standard) require system/circuit with TVS protection.
Problem: for a given device, the system or circuit, I need to use multiple protection device?
Answer: yes. But need to use what protection device, this basically need to depend on transient threat environment, protection coordination (I
/ O port and power bus) and TVS device position. For example, there are three main threat environment: lightning (surge), electric
Fast transient (EFT) and electrostatic discharge (ESD). Any one of these threats can directly or indirectly induce equipment,
System or circuit in multiple interfaces problems. Therefore, all the interface need protection, it is need to use a variety of protection device.
Question: in printed circuit board (PCB) on two different grounding line between I need to use TVS protection device?
Answer: yes, in the PCB away from a common contact furthest point. In the circuit board level, usually between ground there will be some isolation (die
Quasi and digital). But in some of the connection point in the system, the two ground is common. In critical circumstances, circuit the low
Voltage difference must be maintained to prevent ground bounce (GPR), it will affect some sensitive IC components.
Problem: a protective device/network will affect the normal work of the circuit during the signal?
Answer: yes. TVS protection device or the network is connected between the in a circuit, can have the influence of insertion loss or lead to signal loss
True. These protection device/network selection is based on their capacity. In a given operating frequency, existing in the circuit
Other elements will affect the TVS device capacitance value. Therefore, in the circuit parasitic or transmission capacity to TVS device
Choice is a very important considerations.
Problem: hand-held devices need to momentary thunder and lightning threat of protection?
Answer: for the hand-held product environmental threat is mainly electrostatic discharge (ESD). However, when the product is placed on the stent charging or
Connected to the computer to carry on the download, it also can become susceptible should be struck by lightning and the possible electrical fast transient (EFT) influence.
Problem: a due to the line impedance mismatch cause reflection signals, can be removed by filtering?
Answer: can't. Filter is designed to filter out the design of low voltage noise. Reflected signal is usually two times the input pulse amplitude
And frequency. Therefore, it is recommended to use by TVS/filter combination of circuit to such high voltage at the same time reduce the residual noise.
Problem: low frequency and high frequency between the cutoff point is how much?
Answer: for TVS device choice, parting is in 10 to 30 MHz range. Low capacitance TVS device can be used for high
In the 30 MHz work frequency. The actual capacitance value will also depend on line or circuit of parasitic components
Question: when why we want to use different types of waveform (namely 10/1000 μ s, 8/20 μ s, etc.) ?
Answer: our TVS to choose to use what waveform to test is based on a system it need to meet the specific standard. waveform
Is an environmental threat of representation, also is the actual system test results. For example, 10/1000 μ s is long transmission line was ray
Strike waveform, 8/20 μ s is close to lightning point nearby waveform, 1/30 ns were in ESD waveform.
Some wave depends on the source of the threat. For example, ESD has 1/30 ns waveform and EFT have multiple volleying 5/50 ns waveform.
Question: for a pulse waveform description why use 50% of the attenuation to represent pulse time?
Answer: a pulse waveform can be used two ways to measure. The most common way is to 50% wave attenuation point measurement. this
50% wave attenuation point represents the waveform in the curve of the whole area.
Question: why is it said that the TVS protection device or protect the network capacity is very important parameter?
Answer: protection device capacitance will affect the circuit performance, insertion loss, reflection and signal integrity. As data transmission speed
Degree enhancement, TVS protection device or protect the network's capacity to become more concern.
Question: how do I know should be for the use of TVS protection device or protect the network configuration how much space?
Answer: for a given waveform, transient threat from standard voltage, current, or both to define the transient conditions.
Therefore, the use of selected TVS device or protect the network needs matching a given waveform peak pulse current threats. if
Fruit a low capacitance TVS protection device is necessary, these devices usually has a bit more largish package size. Small seal
Loading, such as flip chip, general enough for ESD transients and low frequency application.
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