18. What does your nomenclature -01, -02, -03, and AC, BC, AB, AN mean?
-01 means both sides of the TEC are metallized, -02 means the bottom (hot) side is metallized and -03 means neither side is metallized (bare ceramic on both sides).
AC means Alumina ceramics. BC means Beryllia ceramics. AB means there is a mix of Alumina and Beryllia on top or bottom ceramics (or within the stages of a multi-stage thermoelectric cooler). AN means Alumina Nitride.