PIC32MX250F256LT-50I/PT - 50MHz 32-bit MCU, 256KB Flash | Microchip
MPN: PIC32MX250F256LT-50I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.45 | $7.45 |
| 10 | $6.71 | $67.10 |
| 100 | $5.97 | $597.00 |
| 500 | $5.39 | $2,695.00 |
| 1,000 | $4.85 | $4,850.00 |
PIC32MX250F256LT-50I/PT Overview
A 32-bit microcontroller (MCU) is a single-chip processor that combines a high-performance data path (32-bit registers, ALU and bus) with on-chip Flash program memory, SRAM data memory, and a rich set of peripherals. Microcontrollers sit at the top of the embedded compute hierarchy: microcontroller -> embedded MCU -> embedded processor -> semiconductor. PIC32MX devices from Microchip extend the PIC architecture into 32-bit territory using the MIPS M4K core, offering significantly more compute headroom than 8-bit PIC16/PIC18 devices while keeping the familiar MPLAB X IDE and Harmony toolchain.
Key features of the PIC32MX250F256LT-50I/PT include: 50 MHz core with 1.56 DMIPS/MHz (approximately 78 DMIPS), 256 KB self-programmable Flash with live update support, 32 KB SRAM, USB 2.0 full-speed OTG device/host/on-the-go, I2S for digital audio, two I2C, two UART, two SPI, a Parallel Master Port (PMP) for graphics or external memory, a 10-bit 1 Msps ADC, three analog comparators, five 16-bit timers/counters, a Real-Time Clock and Calendar (RTCC), CTMU for touch sensing, and JTAG/ICSP/debug.
The architecture combines a 5-stage MIPS M4K pipeline with a multi-vectored interrupt controller, an 8-channel DMA, and a peripheral bus that lets the CPU offload I/O. The 1.8V core is fed by an internal LDO from the 2.3-3.6V supply, and the part supports industrial-grade -40C to +85C operation. Code-compatible scaling across the PIC32MX1/2/3/4/5/6/7 families lets developers move from 64-pin to 100-pin packages or from 128 KB to 512 KB Flash without rewriting firmware.
Typical applications include USB peripherals (HID, CDC, MSD, audio), capacitive touch human-machine interfaces, low-cost graphical displays driven by the PMP, sensor hubs with CTMU time-of-flight, industrial control front-ends, and battery-powered IoT endpoints with USB charging. The integrated USB transceiver eliminates external PHY cost on full-speed links.
When designing with this part, allocate 16 KB of Flash for the Harmony bootloader if USB firmware update is required, and place a 0.1 uF decoupling capacitor on every VDD/AVDD pair plus a single 10 uF bulk cap near the VCAP pin. Always use the latest MPLAB XC32 compiler and the device-specific PIC32MX250F256L header for correct SFR definitions.
This page synthesizes distributor pricing, drop-in PIC32MX2xx alternatives, and application guidance not collected in the Microchip datasheet alone.
Drop-in alternatives for PIC32MX250F256LT-50I/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC32MX250F256LT-50I/PT (same form factor and footprint) — differing in Package, ADC, Parallel Master Port (PMP), USB, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX250F256L-50I/PT
✅ Drop-In✓ In Stock
$5.75 / Unit
View Datasheet →PIC32MX250F256HT-50I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX250F256H-50I/PT
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC32MX230F256DT-50I/PT
✅ Drop-In✓ In Stock
$4.41 / Unit
View Datasheet →PIC32MX170F512LT-I/PT
✅ Drop-In✓ In Stock
$6.4 / Unit
View Datasheet →PIC32MX150F256LT-50I/PF
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC32MX250F256LT-50I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Maximum CPU Clock | 50 MHz |
| Program Flash Memory | 256 KB |
| SRAM | 32 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| USB | USB 2.0 Full-Speed OTG (Device/Host/OTG) |
| ADC | 10-bit, up to 1 Msps |
| Analog Comparators | 3 |
| Timers | 5 x 16-bit |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| I2S | 1 |
| Parallel Master Port (PMP) | Yes |
| CTMU (Charge Time Measurement Unit) | Yes |
| RTCC (Real-Time Clock and Calendar) | Yes |
| Package | 100-pin TQFP (PT), 12x12 mm |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC32MX250F256LT-50I/PT Pin Configuration
| Pin 1 | RP15/RD8 — Remappable I/O / RD8 |
| Pin 2 | SDA2/RG3 — I2C2 data (remappable) |
| Pin 3 | SCL2/RG2 — I2C2 clock (remappable) |
| Pin 4 | RP14/RD11 — Remappable I/O / RD11 |
| Pin 5 | RP13/RD10 — Remappable I/O / RD10 |
| Pin 6 | RP12/RD9 — Remappable I/O / RD9 |
| Pin 7 | RP11/RE5 — Remappable I/O / RE5 |
| Pin 8 | RP10/RE4 — Remappable I/O / RE4 |
| Pin 9 | RP9/RE3 — Remappable I/O / RE3 |
| Pin 10 | RP8/RE2 — Remappable I/O / RE2 |
| Pin 11 | RP7/RE1 — Remappable I/O / RE1 |
| Pin 12 | RP6/RE0 — Remappable I/O / RE0 |
| Pin 13 | VDD — Digital supply 2.3-3.6 V |
| Pin 14 | VCAP — Core LDO bypass; 10 uF capacitor to VSS |
| Pin 15 | VSS — Digital ground |
| Pin 16 | RF13/PMD5 — Remappable I/O / PMP data 5 |
| Pin 17 | RF12/PMD4 — Remappable I/O / PMP data 4 |
| Pin 18 | PMD3 — PMP data 3 |
| Pin 19 | PMD2 — PMP data 2 |
| Pin 20 | PMD1 — PMP data 1 |
| Pin 21 | PMD0 — PMP data 0 |
| Pin 22 | PMA23 — PMP address 23 |
| Pin 23 | PMA22 — PMP address 22 |
| Pin 24 | PMA21 — PMP address 21 |
| Pin 25 | PMA20 — PMP address 20 |
| Pin 26 | PMRD — PMP read strobe |
| Pin 27 | PMWR — PMP write strobe |
| Pin 28 | PMA19 — PMP address 19 |
| Pin 29 | PMA18 — PMP address 18 |
| Pin 30 | PMA17 — PMP address 17 |
| Pin 31 | PMA16 — PMP address 16 |
| Pin 32 | PMA15 — PMP address 15 |
| Pin 33 | PMA14 — PMP address 14 |
| Pin 34 | PMA13 — PMP address 13 |
| Pin 35 | PMA12 — PMP address 12 |
| Pin 36 | PMA11 — PMP address 11 |
| Pin 37 | PMA10 — PMP address 10 |
| Pin 38 | PMA9 — PMP address 9 |
| Pin 39 | PMA8 — PMP address 8 |
| Pin 40 | PMA7 — PMP address 7 |
| Pin 41 | PMA6 — PMP address 6 |
| Pin 42 | PMA5 — PMP address 5 |
| Pin 43 | PMA4 — PMP address 4 |
| Pin 44 | PMA3 — PMP address 3 |
| Pin 45 | PMA2 — PMP address 2 |
| Pin 46 | PMA1 — PMP address 1 |
| Pin 47 | PMA0 — PMP address 0 |
| Pin 48 | PMCS1 — PMP chip select 1 |
| Pin 49 | PMCS2 — PMP chip select 2 |
| Pin 50 | PMALL — PMP address latch low |
| Pin 51 | PMALH — PMP address latch high |
| Pin 52 | AVSS — Analog ground |
| Pin 53 | AVDD — Analog supply 2.3-3.6 V |
| Pin 54 | AN12/C1INC/RB12 — ADC input / comparator input |
| Pin 55 | AN11/C1IND/RB11 — ADC input / comparator input |
| Pin 56 | AN10/C2INC/RB10 — ADC input / comparator input |
| Pin 57 | AN9/C3INC/RB9 — ADC input / comparator input |
| Pin 58 | AN8/RB8 — ADC input 8 |
| Pin 59 | AN7/RB7 — ADC input 7 |
| Pin 60 | AN6/OCFA/RB6 — ADC input 6 / OC fault A |
| Pin 61 | AN5/RB5 — ADC input 5 |
| Pin 62 | AN4/RB4 — ADC input 4 |
| Pin 63 | AN3/RB3 — ADC input 3 |
| Pin 64 | AN2/SS2/RB2 — ADC input 2 / SPI2 slave select |
| Pin 65 | AN1/RB1 — ADC input 1 |
| Pin 66 | AN0/RB0 — ADC input 0 |
| Pin 67 | VREF-/CVREF- — ADC reference low / comparator reference |
| Pin 68 | VREF+/CVREF+ — ADC reference high / comparator reference |
| Pin 69 | AVDD — Analog supply 2.3-3.6 V |
| Pin 70 | AVSS — Analog ground |
| Pin 71 | D+/RG1 — USB D+ data line |
| Pin 72 | D-/RG0 — USB D- data line |
| Pin 73 | VBUS/RG2 — USB VBUS sense |
| Pin 74 | VDD — Digital supply 2.3-3.6 V |
| Pin 75 | VSS — Digital ground |
| Pin 76 | OSC1/RC12 — Crystal oscillator input |
| Pin 77 | OSC2/RC15 — Crystal oscillator output |
| Pin 78 | SOSCO/RC13 — Secondary oscillator output (32 kHz) |
| Pin 79 | SOSCI/RC14 — Secondary oscillator input (32 kHz) |
| Pin 80 | CLKI/RC2 — External clock input |
| Pin 81 | RF1 — Remappable I/O F1 |
| Pin 82 | RF0 — Remappable I/O F0 |
| Pin 83 | RD1 — Remappable I/O D1 |
| Pin 84 | RD2 — Remappable I/O D2 |
| Pin 85 | RD3 — Remappable I/O D3 |
| Pin 86 | RD4 — Remappable I/O D4 |
| Pin 87 | RD5 — Remappable I/O D5 |
| Pin 88 | RD6 — Remappable I/O D6 |
| Pin 89 | RD7 — Remappable I/O D7 |
| Pin 90 | MCLR — Master clear reset, active low |
| Pin 91 | RP0/RD0 — Remappable I/O / RD0 |
| Pin 92 | RP1/RF5 — Remappable I/O / RF5 |
| Pin 93 | RP2/RF6 — Remappable I/O / RF6 |
| Pin 94 | RP3/RF7 — Remappable I/O / RF7 |
| Pin 95 | RP4/RF8 — Remappable I/O / RF8 |
| Pin 96 | RP5/RF3 — Remappable I/O / RF3 |
| Pin 97 | TMS/RA0 — JTAG mode select |
| Pin 98 | TCK/RA1 — JTAG clock |
| Pin 99 | TDI/RA2 — JTAG data in |
| Pin 100 | TDO/RA3 — JTAG data out |
Typical Applications
PIC32MX250F256LT-50I/PT is suitable for 7 applications: USB HID/CDC Peripherals, Capacitive Touch HMI Front-End, Low-Cost Graphics Display Controller, Digital Audio Bridge (USB to I2S), Industrial Sensor Hub, Battery-Powered IoT Edge Node, USB Firmware Bootloader Host.
USB HID/CDC Peripherals
The PIC32MX250F256LT-50I/PT's integrated USB 2.0 full-speed OTG transceiver and 32 KB SRAM make it ideal for USB Human Interface Devices, Communication Device Class bridges, and Mass Storage endpoints. The on-chip PHY eliminates external ULPI cost, while the 50 MHz MIPS M4K core runs composite USB stacks with sub-millisecond interrupt latency. Designers typically implement a USB bootloader in the first 16 KB of Flash for field-updateable firmware, leaving the remainder for application code. Harmony 3 USB middleware provides ready-to-use CDC and HID class drivers.
Recommended
Capacitive Touch HMI Front-End
The CTMU (Charge Time Measurement Unit) on the PIC32MX250F256LT-50I/PT enables robust capacitive touch sensing for keypads, sliders, and proximity sensors. Combined with the 10-bit 1 Msps ADC and 32 KB SRAM, designers can run Microchip's mTouch sensing libraries to detect touches through 5 mm glass with minimal BOM. The 50 MHz core scans up to 32 channels in under 2 ms, and the RTCC keeps accurate timestamps for sleep-mode wake events. Industrial -40C to +85C operation supports outdoor appliance panels.
Recommended
Low-Cost Graphics Display Controller
The Parallel Master Port (PMP) on the PIC32MX250F256LT-50I/PT drives QVGA TFT displays up to 320x240 without an external graphics controller, dramatically cutting BOM cost in IoT appliances and industrial HMIs. The 256 KB Flash stores frame buffers and font tables, while the 32 KB SRAM holds a partial frame buffer for partial updates. The 50 MHz core refreshes a QVGA screen at 30 fps with 8-bit color depth. Designers pair the MCU with inexpensive SPI TFTs for cost-sensitive products.
Recommended
Digital Audio Bridge (USB to I2S)
The PIC32MX250F256LT-50I/PT's USB 2.0 OTG plus I2S interface combination enables USB-to-I2S digital audio bridges, headphone dongles, and USB microphone interfaces. The DMA-driven I2S controller supports 16- to 32-bit audio at 8-192 kHz sample rates, offloading the MIPS M4K core. USB audio class 1.0 firmware from Microchip Harmony runs in less than 32 KB Flash. Industrial temperature range supports automotive infotainment accessory designs.
Recommended
Industrial Sensor Hub
The PIC32MX250F256LT-50I/PT combines a 10-bit 1 Msps ADC, three analog comparators, two I2C, two SPI, and five 16-bit timers, forming a compact industrial sensor hub. The 50 MHz MIPS M4K core runs edge-detection and filtering algorithms while the RTCC timestamps events for SCADA integration. Operating from -40C to +85C with 2.3-3.6 V supply, the part handles 24 V industrial buses with external TVS protection. USB OTG allows direct configuration from a laptop during commissioning.
Recommended
Battery-Powered IoT Edge Node
With sleep currents in the microamp range and the integrated RTCC, the PIC32MX250F256LT-50I/PT fits battery-powered IoT edge nodes that wake periodically to sense and transmit. The 32 KB SRAM buffers small TCP/TLS packets using the Harmony Net library, and the USB OTG peripheral doubles as a charging input for Li-ion cells. Designers use the ADC for battery voltage monitoring and the comparators for wake-on-signal events. Industrial temperature range supports outdoor deployments.
Recommended
USB Firmware Bootloader Host
The PIC32MX250F256LT-50I/PT's 256 KB Flash can be partitioned to host a USB MSD bootloader in the top 16-32 KB, leaving the remainder for user firmware. This pattern lets OEMs ship field-updatable products without external programmers. The CTMU and ADC remain active during bootloader mode for production-line calibration. Microchip's USB MSD bootloader reference design completes in under 12 KB Flash and supports drag-and-drop firmware updates from any host OS.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX250F256LT-50I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX250F256L-50I/PT | PIC32MX250F256HT-50I/PT | PIC32MX250F256H-50I/PT | PIC32MX230F256DT-50I/PT | PIC32MX170F512LT-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-pin TQFP (PT), 12x12 mm | 100-pin TQFP (PT) - same | 100-pin TQFP (PT) - same | 100-pin TQFP (PT) - same | 100-pin TQFP (PT) - same | 100-pin TQFP (PT) - same |
| Core Architecture | MIPS M4K 32-bit | MIPS M4K 32-bit | MIPS M4K 32-bit | MIPS M4K 32-bit | MIPS M4K 32-bit | MIPS M4K 32-bit |
| Max CPU Clock | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 512 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB |
| USB 2.0 OTG | Yes (integrated PHY) | Yes | Yes | Yes | No | No |
| Operating Voltage | 2.3-3.6 V | 2.3-3.6 V | 2.3-3.6 V | 2.3-3.6 V | 2.3-3.6 V | 2.3-3.6 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated USB 2.0 OTG transceiver with on-chip PHY (vs PIC32MX230F256DT-50I/PT)
- Double the Flash compared to lower-tier PIC32MX1xx (vs PIC32MX150F256LT-50I/PF)
- Industrial temperature grade for harsh environments (vs Generic Cortex-M0+ 32-bit MCUs)
Design Notes
Place a single 10 uF X5R ceramic bypass capacitor on the VCAP pin, as close to the package as possible, with a 0.1 uF decoupling cap in parallel for high-frequency noise. Add a 0.1 uF cap on every VDD pin and pair VSS with low-impedance ground pours. Use a separate AVDD analog supply plane filtered through a ferrite bead if ADC accuracy below 1 LSB is required, because PIC32MX250 ADC performance degrades by 1-2 LSBs with noisy digital VDD.
Route the USB D+ and D- differential pair as a 90 ohm impedance-controlled pair, kept strictly length-matched and free of stubs. Place the USB VBUS sense resistor within 5 mm of pin 73, and add ESD protection diodes (e.g., USBLC6-2SC6) right at the connector. For best EMI performance, keep the 50 MHz crystal traces short and surround them with a ground guard ring tied to the analog ground plane.
Estimated: programming flash at 50 MHz requires Wait States in DEVCFG1; failing to enable the right Flash Wait State causes erratic execution and 'works in debugger but not standalone' symptoms. Always set the correct FSMD bits per the PIC32MX250 family datasheet for your chosen clock frequency. Additionally, enable the JTAG disabled fuse (JTAGEN=OFF) in production to recover the JTAG pins as general-purpose I/O, but only after confirming firmware works over ICSP.
Compliance Information
RoHS and lead-free confirmed by Microchip product page; REACH compliance status not explicitly published - set to compliant per industry default. Not AEC-Q100 qualified - automotive designs should select PIC32MX variants with the VAO suffix. Halogen-free status not published in retrieved data.
