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How to select the TVS diode for the interface of an intelligent low-voltage monitoring unit?

Time：2026-01-27 Views：528次
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The selection of the TVS diode for the interface is based on the operating voltage and transient energy. Power port: For a 24VDC system, select SMBJ24CA, VRWM=24V.

Communication port: For RS485, select SMBJ6.5CA.

Signal port: For 5V signals, select SMBJ5.0CA.

Selection principles: VRWM slightly higher than the operating voltage; IPP greater than the expected surge current; junction capacitance should not affect the signal.

Installation: Close to the interface, short leads.

With proper selection, the TVS diode can effectively clamp overvoltages.

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