Silicon Protection Arrays Application Guide 10/100 Ethernet Considerations: ● 10/100 relates to the data rate in Mbps (i.e. 10Mbps and 100Mbps) → For 10 Base-T, data is transmitted over 2 UTP (unshielded twisted pairs) using a 10MHz clock → For 100Base-TX, data is transmitted over 2 UTP using a 125MHz clock ● For these data rates the parasitic capacitance needs to be taken into account to preserve signal integrity ● The 4 data lines below (Tx+/- and Rx+/-) are being protected against intra-building (i.e. 100A, tP=8/20us) lightning transients by a two stage protection scheme Application Schematic: RJ-45 Connector *Package is shown as transparent Tx+ J1 TxOutside World Ethernet PHY Rx+ Rx- J8 SP03 (x2) NC Case GND Case GND SP3050 Recommended SPA Devices: Lightning (tP=8/20μs) 150A I/O Capacitance 16pF # of Channels 2 VRWM Packaging SP03-xBTG ESD Level (Contact) ±30kV 3.3V,6V SOIC-8 SP3050-04HTG ±20kV 10A 2.4pF 4 6V SOT23-6 Ordering Number ©2009 Littelfuse, Inc 10