A feedthrough filter capacitor assembly, which comprises: a) a conductive ferrule comprising an annular sidewall having a ferrule opening extending axially along the ferrule sidewall from a first end to a second, opposite end thereof; b) at least one conductive terminal pin; c) a feedthrough insulator having an outer sidewall hermetically sealed to an inner surface of the ferrule sidewall and comprising a bore for passage of the terminal pin therethrough; d) a filter capacitor mounted axially at one outer side of the feedthrough insulator and having a bore formed therein for pass-through reception of the terminal pin, wherein the filter capacitor comprises: i) a filter insulating substrate having a terminal pin bore for passage of the terminal pin therethrough and an outer sidewall residing adjacent to the inner surface of the ferrule sidewall; ii) at least a first electrode layer of an electrically conductive material supported on the filter insulating substrate and having a first edge terminating immediately adjacent to the terminal pin bore; iii) a first dielectric layer covering at least a portion of the first electrode layer and having opposed ends spaced from the terminal pin bore and from the outer sidewall of the filter insulating substrate, respectively; and iv) at least a second, opposite polarity electrode layer of an electrically conductive material supported on the filter insulating substrate and having a second edge terminating immediately adjacent to the outer sidewall of the filter insulating substrate; and e) a conductive material (224, 226) providing electrical conductivity from one of the first and second electrode layers to the terminal pin and from the other of the first and second electrode layers to the ferrule. a) a conductive ferrule comprising an annular sidewall having a ferrule opening extending axially along the ferrule sidewall from a first end to a second, opposite end thereof; b) at least one conductive terminal pin; c) a feedthrough insulator having an outer sidewall hermetically sealed to an inner surface of the ferrule sidewall and comprising a bore for passage of the terminal pin therethrough; d) a filter capacitor mounted axially at one outer side of the feedthrough insulator and having a bore formed therein for pass-through reception of the terminal pin, wherein the filter capacitor comprises: i) a filter insulating substrate having a terminal pin bore for passage of the terminal pin therethrough and an outer sidewall residing adjacent to the inner surface of the ferrule sidewall; ii) at least a first electrode layer of an electrically conductive material supported on the filter insulating substrate and having a first edge terminating immediately adjacent to the terminal pin bore; iii) a first dielectric layer covering at least a portion of the first electrode layer and having opposed ends spaced from the terminal pin bore and from the outer sidewall of the filter insulating substrate, respectively; and iv) at least a second, opposite polarity electrode layer of an electrically conductive material supported on the filter insulating substrate and having a second edge terminating immediately adjacent to the outer sidewall of the filter insulating substrate; and i) a filter insulating substrate having a terminal pin bore for passage of the terminal pin therethrough and an outer sidewall residing adjacent to the inner surface of the ferrule sidewall; ii) at least a first electrode layer of an electrically conductive material supported on the filter insulating substrate and having a first edge terminating immediately adjacent to the terminal pin bore; iii) a first dielectric layer covering at least a portion of the first electrode layer and having opposed ends spaced from the terminal pin bore and from the outer sidewall of the filter insulating substrate, respectively; and iv) at least a second, opposite polarity electrode layer of an electrically conductive material supported on the filter insulating substrate and having a second edge terminating immediately adjacent to the outer sidewall of the filter insulating substrate; and e) a conductive material (224, 226) providing electrical conductivity from one of the first and second electrode layers to the terminal pin and from the other of the first and second electrode layers to the ferrule.