16-bit MCU for low-power mixed-signal control
NRND — plan a last-time buy or second source
The MSP430F5437IPNR carries an NRND (Not Recommended for New Designs) status. That means TI has stopped active design-in support, though the part remains available for existing production runs through the independent channel. For a BOM that already qualifies this MCU, the window to secure final lifetime volumes is open but narrowing. No official successor order code is listed in the lifecycle record. The MSP430F5xx family includes pin-compatible density variants — an engineer cross-referencing the base product number MSP430F5437 can evaluate a step up to a higher Flash/RAM sibling within the same 80-LQFP footprint, but that requires a firmware port and re-qualification.
18 MHz and 256 KB Flash — what they mean for the BOM
The core runs at 18 MHz. The 16-channel 12-bit ADC conversion time is the throughput limit. 256 KB of Flash and 16 KB of RAM support a Modbus RTU slave with a lookup table and sensor buffer.
Sourcing posture
This part is sourced and quoted to order through independent distribution. Availability and current pricing are confirmed at quote time. For a BOM line already using the MSP430F5437IPNR, an RFQ is the right next step to lock in allocation before the NRND window closes.