80 MHz Cortex-M3 with 384 KB flash — what it means for the BOM
The LM3S1G21-IBZ80-A1T: That flash footprint handles a full control stack plus application logic without external memory — think motor-drive firmware with sensorless FOC or a multi-axis motion controller. The 67 GPIOs and rich peripheral set — including EBI/EMI, I²C, SPI, UART, and LIN — let it interface directly with industrial encoders, HMI panels, and fieldbus transceivers without a glue CPLD.
Package and board-fit for field rework
Housed in a 108-ball BGA (10x10 mm), the part demands a controlled reflow profile and X-ray inspection after assembly — not a hand-solder swap in the field. Industrial temperature range from -40°C to 85°C means it survives cold-start in an unheated cabinet and the heat rise inside a sealed enclosure.
Lifecycle reality — obsolete, sourced to order
Texas Instruments lists the LM3S1G21-IBZ80-A1T as obsolete. For BOM lines that still call this exact order code, supply runs through independent distribution — quantities are lot-specific and confirmed at RFQ.