With the book, you will also receive a case study. In terms of mounting type, the recommended type is Surface Mount. In this case, it is embedded in the SC-74A, SOT-753 case. If you search for the AN6123MS family of parts, you will be able to find similar parts. In this case, MINI-5D packages the device.
AN6123MS-TXL Features
With SC-74A, SOT-753 channels
AN6123MS-TXL Applications
There are a lot of Panasonic Electronic Components AN6123MS-TXL Audio Special Purpose applications.