PIC32MX250F128B-50I/ML
PIC32MX250F128B-50I/ML - 50MHz 32-bit MCU 128KB Flash | Microchip
The Microchip PIC32MX250F128B-50I/ML is a 32-bit MIPS32 M4K RISC microcontroller running at 50 MHz (83 DMIPS) with 128 KB Flash and 32 KB SRAM, housed in a 28-pin QFN (6x6 mm) package with an exposed thermal pad. It targets audio, graphics, USB, and advanced-analog embedded applications requiring more performance than 8/16-bit MCUs.
A 32-bit microcontroller (MCU) is a single-chip computer with a 32-bit datapath, on-chip Flash program memory, SRAM data memory, and a rich set of peripherals (timers, ADC, communication controllers). Within the taxonomy, PIC32MX250F128B-50I/ML belongs to: microcontroller -> 32-bit MCU -> MIPS MCU -> PIC32MX family -> general-purpose performance line. It is engineered for mid-volume embedded designs that need USB, graphics LCD, and capacitive touch without moving to an ARM Cortex-M device.
Key specifications include 128 KB Flash, 32 KB SRAM, USB 2.0 Full-Speed OTG, two I2S/SPI modules, a Parallel Master Port (PMP) for graphics, Peripheral Pin Select (PPS) for flexible pin mapping, a 1 Msps 10-channel 10-bit ADC, mTouch capacitive-touch support, and 1 ns high-resolution timer capture. Operating voltage is 2.5 V / 3.3 V (range typically 2.3 V to 3.6 V), current consumption is 0.5 mA/MHz active, and the industrial temperature grade is -40 C to +105 C.
Architecturally, the PIC32MX250F128B uses the MIPS32 M4K core with a 5-stage pipeline, hardware multiply/divide, single-cycle MAC, and pre-fetch cache for deterministic interrupt response. The 50 MHz rating delivers 83 DMIPS, enough for USB stacks, small TCP/IP, audio decoding, and graphical user interfaces. The PMP and PPS features let the same 28-pin footprint drive LCDs, keypads, or external memory - a flexibility point that PIC24 and PIC16 cannot match.
Typical applications include USB HID/audio peripherals, low-cost graphical displays, capacitive-touch control panels, industrial sensor hubs, and connected IoT edge nodes. The combination of USB + PMP + mTouch in a 28-pin QFN makes it well-suited to compact, mixed-signal designs that previously required a separate USB controller.
When designing with this device, route the exposed thermal pad (EP) to a continuous ground plane to keep theta-JA low, place the 12 MHz primary oscillator within 12 mm of the OSCI/OSCO pins, and bypass each VDD/VUSB pair with a 0.1 uF ceramic capacitor as close to the IC as possible. Decoupling layout dominates USB and PMP signal-integrity results more than firmware tuning.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. All specifications were sourced from Microchip's PIC32MX1XX/2XX 28/36/44-pin family datasheet (DS60001168L) and cross-checked against DigiKey, Mouser, and Octopart as of 2026-10-02.
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