PIC32MX270F256B-V/SS
PIC32MX270F256B-V/SS - 50MHz 32-bit MCU 256KB Flash USB SSOP-28
The Microchip Technology PIC32MX270F256B-V/SS is a 32-bit MIPS M4K RISC microcontroller running up to 50 MHz delivering 83 DMIPS, with 256 KB Flash and 64 KB SRAM, integrated USB 2.0 full-speed device/host/OTG, two I2S/SPI modules, and a 10-bit 1 Msps ADC, in an industrial-grade SSOP-28 package.
A 32-bit microcontroller (MCU) is a single-chip computer that integrates a 32-bit CPU core, Flash program memory, SRAM data memory, and a rich set of peripherals (ADC, timers, communication controllers, GPIO) into one IC. In the broader taxonomy, the PIC32MX270F256B-V/SS belongs to the microcontroller category, which itself sits under microcontrollers -> embedded processors -> integrated circuits -> semiconductors. The PIC32MX1XX/2XX family specifically targets cost-sensitive applications that still require USB connectivity, larger memory, and DSP-class throughput, distinguishing it from 8-bit PIC16/PIC18 families and from higher-end PIC32MZ parts.
Key features include 0.5 mA/MHz typical run current, a 1.0 mA typical IDLE current, Peripheral Pin Select (PPS) for flexible signal routing, Parallel Master Port (PMP) for graphics interfaces, CTMU for mTouch capacitive touch and high-resolution 1 ns time measurement, an on-chip temperature sensor, and an integrated USB 2.0 full-speed transceiver. The -V suffix indicates a -40C to +105C industrial operating range, and the SSOP-28 (5.30 mm body) provides a smaller footprint than SOIC-28 while remaining hand-solderable. The combination of 83 DMIPS and 1.5 MB total addressable memory makes it suitable for USB audio, USB HID, and modest graphics stacks.
The architecture combines a Harvard-style MIPS M4K core with a multi-channel DMA controller, a 5-stage pipeline, hardware multiply/divide, and a single-cycle 32-bit ALU. The USB OTG controller with on-chip transceiver eliminates external PHY components for full-speed USB 2.0 designs. PPS remaps digital peripheral I/O to a wide range of physical pins, simplifying PCB layout when multiple peripheral functions compete for limited pins.
Typical applications include USB audio interfaces, USB HID/CDC devices, low-cost graphics HMI with PMP-driven LCDs, capacitive touch key/slider panels, industrial control with USB diagnostics, and educational development boards. The wide industrial temperature range extends usability to outdoor enclosures and factory-floor equipment.
When designing in, plan for two decoupling capacitors per VDD/AVDD pair, a 12 MHz or 24 MHz primary crystal with proper load capacitors, and a dedicated 3.3 V rail with adequate headroom. PPS mapping must be assigned in firmware before peripheral use, and the USB D+/D- traces should be length-matched and routed away from switching nodes to pass USB compliance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
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