Texas Instruments MSP430F2xx series 16-bit MCU, MSP430F2121IDWR, 16 MHz, 4KB Flash, 256B RAM, 16 I/O, 1.8V-3.6V, -40°C to 85°C, 20-SOIC.
| Parameter | Value |
|---|---|
| Series | MSP430F2xx |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 1.8V ~ 3.6V |
| Operating temperature | -40°C~85°C(TA) |
| Speed | 16MHz |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| RAM size | 256 x 8 |
| Core size | 16-Bit |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of i (O) | 16 |
| Core processor | MSP430 CPU16 |
| Case | 20-SOIC (0.295\", 7.50mm Width) |
| Data converters | Slope A/D |
| Program memory size | 4KB (4K x 8 + 256B) |
The slope A/D converter handles basic analog sensing without an external ADC.
The 1.8V to 3.6V supply range means it can run directly from a 3.6V Li-ion cell or a 1.8V regulated rail without a secondary LDO.
TI lists the MSP430F2121IDWR as Active (current production). The MSP430F2xx series has broad distribution coverage.
The evidence does not carry an official second-source or direct replacement. For a higher-performance alternative within TI's portfolio, the F280041PZQR (C2000 C28x core, 100 MHz, 32-bit) is a different architecture and would require a full redesign — not a pin-compatible swap.
Yes. The supply range is 1.8V to 3.6V, so 3.3V logic levels are within spec. The I/O pins are 5V-tolerant on most MSP430F2xx devices, but verify the absolute maximum ratings in the datasheet for the specific pin function.