TT electronics IRC Advanced Film Division has developed a substrate technology that offers benefits over conventional polymer-based insulated metal substrates (IMS). Designated Anotherm, IRC’s new material consists of a thermally-conductive aluminum alloy substrate insulated by a thin, chemically grown, anodized dielectric layer, with solderable screen printed conductors applied to the anodized layer. Traditional insulated metal substrate technology (IMS) often relies on a polymer or epoxy material that is mechanically applied to a bare aluminum substrate, which requires extensive surface preparation, as well as a minimum thickness of approximately 75 microns. In addition, traditional IMS technology is subject to delamination at high temperatures. By contrast, the Anotherm process chemically converts the surface of the base aluminum itself to an anodized insulating layer with a uniform thickness of 35 microns, giving the substrate its good thermal properties, as well as eliminating the potential for delamination or peeling. Typical applications for the Anotherm substrate include high brightness LED assemblies, LED packages and power resistors for automotive applications. Maximum operating voltage is 250 VAC, with thermal impedance at 0.2° C per watt. Maximum continuous operating temperature is 400° C without a solder maskant and 175° C with a solder maskant.