Ignition coil with case made from impregnated mica tube

An ignition coil assembly (10) includes a cylindrical central core (16) having a main axis ("A"), a primary winding (18) outwardly of the central core (16), a secondary winding (30) outwardly of the primary winding (18), and a case having a first tube (34) formed of a material having mica dispersed in a binder. The binder is may be a silicone-based binder, an epoxy-based binder or any other binder configured to adhere to the mica. The overall diameter of the ignition coil assembly (10) can reduced relative to conventional designs since the case thickness can be reduced over known designs.