New copies of Millman & Grabel’s 2nd edition are expensive ($150+ used), but older editions (1st edition, 1979) are perfectly adequate for learning fundamentals. Find them for as low as $10 plus shipping.

might focus more on current MOSFET applications, Millman’s textbooks are celebrated for their clarity in explaining the "internal physical behavior" of devices. Legal and Ethical Access to the PDF

Earlier editions were notable for the effective use of a second color to highlight critical concepts and diagrams.

The text spans approximately 1,000 pages and covers both digital and analog circuits.

Modern textbooks often rush to the application side of electronics. Millman, however, dedicates significant space to the physics of semiconductors. He explains the behavior of holes and electrons, Fermi levels, and the band theory of solids. For a student who wants to truly understand why a diode works, rather than just how to use it, this section is invaluable.