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Neither Rth(ch-a) nor Rth(j-a) is specified for MOSFETs, IGBTs and bipolar transistors. Why is that?

self-standing power devices

Since it is common to install heat sinks in self-standing power devices, we are offering Rth(ch-c) and Rth(j-c). (There are exceptions in some products.)
Channel-to-case (or junction-to-case) thermal resistance values should be used for more accurate thermal calculations instead of channel-to-ambient (or junction-to-ambient) thermal resistance values. Be sure to use Rth(ch-c) or Rth(j-c) if it is specified.

Thermal Design and Attachment of a Thermal Fin: Power MOSFET Application Notes (PDF:1,061KB)

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·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.