A voltage-gated sodium channel subtype found in neuronal tissue that mediates the sodium ion PERMEABILITY of excitable membranes.

Synonyms: Voltage-Gated Sodium Channel Type 3 Subunit alpha, Voltage Gated Sodium Channel Type 3, NAV1.3 alpha Subunit, Voltage Gated Sodium Channel Type 3 alpha Subunit, Type 3 Voltage-Gated Sodium Channel, 0, Voltage Gated Sodium Channel Type 3 Subunit alpha, Voltage-Gated Sodium Channel Type 3 alpha Subunit, Voltage-Gated Sodium Channel Type 3, SCN3A Sodium Channel alpha Subunit, NAV1.3 Voltage-Gated Sodium Channel, NAV1.3 Voltage Gated Sodium Channel, alpha Subunit, NAV1.3, Type 3 Voltage Gated Sodium Channel