LAN / WAN Protectors
100Base-T Protection
Capacitance across the pair of wires = (D1 || D2) + P0640EA/SA + (D3 || D4)
The MUR 1100E pair of diodes capacitance is approximately (10 pF || 10 pF) 20 pF. Then,
adding the capacitive effect of the P0640EA/SA (typically 50pF), the total capacitance
across the pair of wires is approximately 8 pF. This will provide a GR 1089 intra-building
compliant design. (Figure 3.45)
Note: MURS160T3 is a SMT equivalent of the MUR 1100E.
D1
D2
P0640EA/SA
D3
D4
Figure 3.45 100 Base-T Protection
The P0642SA is a very low capacitance device that requires no compensating diodes.
(Figure 3.46)
P0642SA
Figure 3.46 100 Base-T Protection Without External Compensation
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SIDACtor Data Book and Design Guide
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