Texas Instruments has ended production of the Stellaris LM3S9U90 series; there is no direct pin-compatible replacement from TI. This part is available now only through independent distribution — surplus factory reels or customer returns that have been verified. The 108-BGA package (10x10 mm) and the specific peripheral mix (Ethernet + USB OTG + CANbus) make it a last-time-buy candidate for legacy designs that cannot justify a board respin.
80 MHz Cortex-M3 with a full peripheral set
This is a Texas Instruments Stellaris ARM Cortex-M3 32-bit single-core MCU running at 80 MHz. There is also an EBI/EMI bus for external memory or FPGA attachment. The 12-bit ADC has 16 channels. The core supply is 1.235 V to 1.365 V; I/O rails are typically 3.3 V (not separately listed but standard for this family).
108-BGA package — design-in notes
This is a fine-pitch BGA — expect a ball pitch around 0.8 mm or 0.65 mm (typical for this body size and ball count). The mounting is surface mount only. For rework, the standard lead-free profile applies; If the original sealed reel is intact, the moisture barrier is preserved.