| TO-8 Three-Stage Packages Description The TO-8-based packages are used for thermoelectrically cooled devices (PCI-3TE and PVI-3TE). The packages are backfilled with inert heavy gases of the low thermal conductivity (Kr/Xe mixtures). Water vapour condensation is prevented by careful package sealing and water absorbers. BaF2 windows are used as a standard. Dimensions in millimeters. |