LM98640QML-SP: Top pad grounding

Steve,

Closing this thread, as we have followed up over e-mail.

For future reference, this package is mounted with the circled pad on the left facing down, mounted to a grounding plane on the PCB. This circled pad on the left is grounded internally.

The lid, shown on the right image as the larger metal surface, is not internally bonded to ground. Continuity testing the lid to ground was open circuit.

With that said, for space applications, the lid should be grounded regardless to prevent a floating conductor condition. Refer to this NASA document (last paragraph on page 28): https://standards.nasa.gov/sites/default/files/standards/NASA/B/0/2022-06-07-NASA-HDBK-4002B-Approved.pdf