Apple 820-0507-02 Trackpad Board PowerBook 520 520C 540 540C 343S6503-A

Apple 820-0507-02 Trackpad Board PowerBook 520 520C 540 540C 343S6503-A

This is the Apple 820-0507-02 trackpad logic board, the internal PCB responsible for trackpad input on the Apple PowerBook 500 series. The board carries the Apple-proprietary 343S6503-A controller IC and interfaces with the laptop's trackpad surface to translate finger movement into cursor input for the system. The board is silkscreened "Apple Computer © 1993," placing it in the early-to-mid 1990s PowerBook 500 production run.

Specifications & What's Included

• Apple Part Number: 820-0507-02
• Main Controller IC: Apple 343S6503-A N (© 1992)
• IC Date Code: QHYR9440
• PCB Copyright / Production Year: 1993
• Form Factor: Internal PCB module
• Compatible Systems: Apple PowerBook 520, 520C, 540, 540C (500 series)
• Connector: Edge-mounted ribbon/flex connector header (visible on PCB edge)
• Trackpad board only — no cables, brackets, or accessories included

Applications

The Apple PowerBook 500 series, introduced in 1994, was notable for being among the first laptops to ship with a built-in trackpad as standard input — replacing the trackball used on earlier PowerBook models. The 520 and 540 lines used the 68LC040 and full 68040 processors respectively and ran System 7. This trackpad board is a direct replacement part for anyone restoring or repairing a PowerBook 520, 520C, 540, or 540C. Demand for these components is driven primarily by vintage Macintosh collectors and restorers keeping 500-series machines in working order, as original Apple replacement parts for this generation are no longer manufactured.