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Home/Questions/Q 1033
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umesh kokate
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umesh kokate
Asked: May 28, 20222022-05-28T13:56:06+05:30 2022-05-28T13:56:06+05:30In: Passives & Protection

Diode selection

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Dear Mahendra sir.

Please help how to select TVS diode for surge protection . How does it work ok surge

 

 

 

 

 

diodessemiconctortvs diodes
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    1. Mahendra Metil
      2022-06-03T10:15:10+05:30Added an answer on June 3, 2022 at 10:15 am

      To select a TVS diode, follow these steps: Select a diode with a standoff voltage that is higher than the normal operating voltage. Ensure that the TVS diode maximum clamping voltage is less than the abs max rating of all the devices on the line to be protected. It is important to consider operationRead more

      To select a TVS diode, follow these steps:

      1. Select a diode with a standoff voltage that is higher than the normal operating voltage. Ensure that the TVS diode maximum clamping voltage is less than the abs max rating of all the devices on the line to be protected. It is important to consider operation during both the transient event (a higher conduction current will result in a higher clamping voltage, for example) and during normal operation when a transient event is not present.
      2. Verify that the specified peak current exceeds the expected peak current. Ensure that the diode is specified to handle the required power during a transient event. Diodes that are too small, or are not designed for a given current, may fail and cause the circuit to be destroyed during a surge or EFT event.
      3. Calculate the maximum clamping voltage (VCL) of the selected diode. TVS diode data sheets typically list the VCL for a given IPP in the part selection table. For other peak pulse currents, however, this VCL may not be valid. To accommodate other IPP values, the TVS diode manufacturer gives a formula in the data sheet to calculate the VCL. Use this formula to calculate the VCL for a given IPP.
      4. Confirm that the calculated VCL is less than the specified abs max rating for the pin.
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    2. Mahendra Metil
      2022-06-03T10:27:12+05:30Added an answer on June 3, 2022 at 10:27 am

      Umesh, Please find attached the file for the selection of the TVS diode. You will understand what parameters need to check & how it works to protect the device from surge spike.

      Umesh,

      Please find attached the file for the selection of the TVS diode. You will understand what parameters need to check & how it works to protect the device from surge spike.

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