Through-hole 8-bit MCU with 64 MHz core and 24-channel ADC
The Microchip PIC18F26Q43-I/SP is an 8-bit MCU from the PIC® XLP™ 18F series, built around a PIC core running at 64 MHz.
64 MHz performance and memory sizing for the BOM
At 64 MHz, this is one of the faster 8-bit PICs, suited for control loops and communication protocols that need more throughput than the typical 32 MHz 8-bit parts. The 4K x 8 RAM handles moderate buffering for UART or SPI data streams. If your application needs more RAM or a 16-bit data path, the PIC24FJ256GA106-I/MR (16-bit, 32 MHz, 53 I/O) or PIC24FV16KA304-I/PT (16-bit, 32 MHz, 38 I/O) are surface-mount alternatives in the same PIC ecosystem, though they trade speed for wider data handling.
It is ROHS3 compliant. For dual-sourcing resilience, the PIC16LF1559-I/SS is a lower-speed (32 MHz) 8-bit alternative with fewer I/O and a surface-mount package, but it is not a direct pin-for-pin replacement — the 28-SPDIP through-hole footprint of the PIC18F26Q43-I/SP is unique among these peers.