>>>Click here for the schematic<<<
Hello people,
this is a circuit for metallic protection of Ethernet line pair.
1.5KE6.8A is a special clamping zener with extremely fast response <1ns and high surge capability, called also Transient Voltage Suppressor. Because of its relatively high capacitance it is not applicable for high speed data transfer lines. There is a trick to reduce it's capacitance by connecting it in series with two low capacitance diodes. See the schematic here>>Click for Schematic
My questions are:
The diodes HER107 are ultra fast - 70ns but not fast enough in comparison with the 1.5KE6.8A. Will this affect the performance of the circuit when an Electrostatic discharge occurs. The rise of the voltage is very fast - some picoseconds.
What happened when you connect in series two diodes? What is the resultant response time of the circuit?
Is this critical for the protection of sensitive elements? Should I use a faster schottky diode - 5ns?
Thank's for the time.
bodhisatva
Hello people,
this is a circuit for metallic protection of Ethernet line pair.
1.5KE6.8A is a special clamping zener with extremely fast response <1ns and high surge capability, called also Transient Voltage Suppressor. Because of its relatively high capacitance it is not applicable for high speed data transfer lines. There is a trick to reduce it's capacitance by connecting it in series with two low capacitance diodes. See the schematic here>>Click for Schematic
My questions are:
The diodes HER107 are ultra fast - 70ns but not fast enough in comparison with the 1.5KE6.8A. Will this affect the performance of the circuit when an Electrostatic discharge occurs. The rise of the voltage is very fast - some picoseconds.
What happened when you connect in series two diodes? What is the resultant response time of the circuit?
Is this critical for the protection of sensitive elements? Should I use a faster schottky diode - 5ns?
Thank's for the time.
bodhisatva