100-LQFP package — fan-out planning for the 67 I/O
The LM3S1G21-IQC80-A2T: Housed in a 100-LQFP (14x14 mm) with a 0.50 mm pitch, this part demands a 4-layer PCB for reliable fan-out of the 67 general-purpose I/O.
Industrial temperature grade and peripheral set
On-chip peripherals include an 8-channel 12-bit ADC, DMA controller, PWM timers, and a brown-out reset — enough signal-chain support to close a current loop without an external ADC. Connectivity covers I²C, SPI, UART, LIN, and an external memory interface.
Obsolete — last-time-buy sourcing through independent channels
Texas Instruments lists this part as obsolete. The 384 KB flash and 64 KB SRAM footprint is common in the Stellaris family, so a board-level redesign to a current-generation Cortex-M4 or M7 part is the typical migration path for new builds.