PIC32MX250F128D-I/PT - 32-bit MCU 128KB Flash USB TQFP-44 | Microchip
MPN: PIC32MX250F128D-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.94 | $59.40 |
| 100 | $5.21 | $521.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
PIC32MX250F128D-I/PT Overview
A 32-bit microcontroller (MCU) is a microprocessor core combined with on-chip memory, peripherals, and I/O that executes firmware stored in non-volatile Flash. Within the broader taxonomy, an MCU belongs to the semiconductor -> integrated circuit -> microcontroller -> 32-bit microcontroller family. The PIC32MX250F128D sits inside Microchip's PIC32MX1XX/2XX series and is designed for applications that exceed 8-bit PIC16/PIC18 capability without the cost of the higher-tier PIC32MZ family.
Key features include two I2S/SPI modules for codec and serial peripherals, a USB 2.0 full-speed device/host/OTG controller, a Parallel Master Port (PMP) for graphics or external memory interfaces, Peripheral Pin Select (PPS) for flexible signal routing, and mTouch capacitive touch sensing support. The ADC offers up to 13 channels with 10-bit resolution, and five 16-bit general-purpose timers plus a 1 ns resolution Input Capture module support high-precision time measurement. The supply voltage range is 2.3 V to 3.6 V with an industrial operating temperature range of -40 C to +85 C.
Architecturally, the PIC32MX250F128D uses a Harvard-style M4K core with separate instruction and data buses, a hardware multiply/divide unit, and tightly-coupled prefetch cache that keeps execution deterministic for real-time control loops. The on-chip USB 2.0 full-speed transceiver with internal pull-ups removes the need for an external PHY, simplifying BOM cost on HID, CDC, and audio-class designs. PPS remapping eliminates the fixed pin-function constraints seen on legacy PIC18 devices, allowing designers to optimize PCB routing for signal integrity.
Typical applications include USB HID peripherals, audio streaming devices using the I2S modules, low-cost graphical user interfaces via the PMP, capacitive touch user panels, and industrial sensor hubs. According to the Microchip datasheet, the part's combination of USB OTG and PMP makes it well suited for portable data loggers and consumer audio accessories.
Design consideration: place a 100 nF decoupling capacitor within 3 mm of every VDD/VDDUSB pin pair and route the USB DP/DM lines as a 90 ohm differential pair to preserve USB 2.0 full-speed signal integrity. PPS must be locked before any peripheral driver enables I/O, otherwise pin mapping silently defaults and digital reads return incorrect logic levels.
This page synthesizes distributor pricing, drop-in PIC32MX alternatives, and practical design notes that are not collected in the manufacturer datasheet, providing a faster engineering decision path.
Drop-in alternatives for PIC32MX250F128D-I/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 PIC32MX250F128D-I/PT (same form factor and footprint) — differing in ADC, Timers, Package, Operating Temperature Range, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX170F256D-I/PT
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →PIC32MX230F256D-50I/PT
✅ Drop-In✓ In Stock
$4.15 / Unit
View Datasheet →PIC32MX154F128D-I/PT
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC32MX150F128D-I/PT
✅ Drop-In✓ In Stock
$2.51 / Unit
View Datasheet →PIC32MX130F128H-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX250F128D-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Maximum CPU Speed | 50 MHz (83 DMIPS) |
| Program Memory (Flash) | 128 KB |
| SRAM | 32 KB |
| Supply Voltage (VDD) | 2.3 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| GPIO Count | 34 |
| Package | TQFP-44 (10x10 mm, 0.80 mm pitch) |
| Mounting Type | Surface Mount |
| USB Interface | USB 2.0 Full-Speed Device/Host/OTG |
| SPI Modules | 2 (I2S/SPI capable) |
| I2C Modules | 2 |
| UART Modules | 2 |
| ADC | 10-bit, up to 13 channels |
| Comparators | 2 |
| Timers | 5 x 16-bit + 1 x 16-bit Input Capture (1 ns resolution) |
| PMP | Yes (Parallel Master Port for graphics) |
| PPS | Yes (Peripheral Pin Select) |
| mTouch Capacitive Touch | Yes |
| Active Current Consumption | < 0.5 mA/MHz |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
PIC32MX250F128D-I/PT Pin Configuration
| Pin 1 | SOSCO/RPC0 — Secondary oscillator output or GPIO |
| Pin 2 | SOSCI/RPC1 — Secondary oscillator input or GPIO |
| Pin 3 | MCLR — Master clear reset input |
| Pin 4 | RPB0/AN0 — Remappable GPIO / ADC input |
| Pin 5 | RPB1/AN1 — Remappable GPIO / ADC input |
| Pin 6 | RPB2/AN2 — Remappable GPIO / ADC input |
| Pin 7 | RPB3/AN3 — Remappable GPIO / ADC input |
| Pin 8 | VSS — Ground |
| Pin 9 | RPC2/PMA2 — GPIO / Parallel Master Port |
| Pin 10 | RPC3/PMA3 — GPIO / Parallel Master Port |
| Pin 11 | VDD — Digital supply voltage 2.3 V to 3.6 V |
| Pin 12 | RPC4/PMA4 — GPIO / Parallel Master Port |
| Pin 13 | RPC5/PMA5 — GPIO / Parallel Master Port |
| Pin 14 | RPC6/PMA6 — GPIO / Parallel Master Port |
| Pin 15 | RPC7/PMA7 — GPIO / Parallel Master Port |
| Pin 16 | RPC8/PMA8 — GPIO / Parallel Master Port |
| Pin 17 | RPC9/PMA9 — GPIO / Parallel Master Port |
| Pin 18 | VSS — Ground |
| Pin 19 | VDD — Digital supply voltage 2.3 V to 3.6 V |
| Pin 20 | D+/RGPU — USB D+ with internal pull-up |
| Pin 21 | D- — USB D- |
| Pin 22 | VDDUSB — USB transceiver supply |
| Pin 23 | VUSB — USB 3.3 V regulator output / bypass |
| Pin 24 | RPD0/AN4 — GPIO / ADC input |
| Pin 25 | RPD1/AN5 — GPIO / ADC input |
| Pin 26 | RPD2/AN6 — GPIO / ADC input |
| Pin 27 | RPD3/AN7 — GPIO / ADC input |
| Pin 28 | RPD4/AN8 — GPIO / ADC input |
| Pin 29 | RPD5/AN9 — GPIO / ADC input |
| Pin 30 | RPD6/AN10 — GPIO / ADC input |
| Pin 31 | RPD7/AN11 — GPIO / ADC input |
| Pin 32 | VSS — Ground |
| Pin 33 | VDD — Digital supply voltage 2.3 V to 3.6 V |
| Pin 34 | RPD8/AN12 — GPIO / ADC input |
| Pin 35 | RPD9/AN13 — GPIO / ADC input |
| Pin 36 | RPD10/AN14 — GPIO / ADC input |
| Pin 37 | RPD11/AN15 — GPIO / ADC input |
| Pin 38 | RPE0/PMD0 — GPIO / Parallel Master Port data |
| Pin 39 | RPE1/PMD1 — GPIO / Parallel Master Port data |
| Pin 40 | RPE2/PMD2 — GPIO / Parallel Master Port data |
| Pin 41 | RPE3/PMD3 — GPIO / Parallel Master Port data |
| Pin 42 | RPE4/PMD4 — GPIO / Parallel Master Port data |
| Pin 43 | RPE5/PMD5 — GPIO / Parallel Master Port data |
| Pin 44 | VSS — Ground |
Typical Applications
PIC32MX250F128D-I/PT is suitable for 6 applications: USB HID Peripherals (Keyboards, Mice, Custom HID), Audio Streaming Devices (USB Headset, DAC Interfaces), Low-Cost Graphical User Interfaces (PMP LCD Displays), Capacitive Touch Panels (mTouch Buttons and Sliders), Industrial Sensor Hubs (USB + I2C + SPI Aggregation), Portable Data Loggers (USB Mass Storage or CDC).
USB HID Peripherals (Keyboards, Mice, Custom HID)
The PIC32MX250F128D-I/PT is purpose-built for USB Human Interface Devices, with an integrated USB 2.0 full-speed Device/Host/OTG controller and an internal transceiver that eliminates the need for an external PHY. The 50 MHz MIPS32 M4K core executes the Microchip USB stack with low CPU overhead, and 32 KB of SRAM comfortably buffers HID report descriptors plus application logic. Designers benefit from PPS flexibility for keyboard matrix scan mapping. Differential pair layout for DP/DM at 90 ohms is critical, and a 100 nF decoupling cap must sit within 3 mm of VDDUSB. This makes the part ideal for high-volume USB HID keyboards, mice, and game controllers.
Recommended
Audio Streaming Devices (USB Headset, DAC Interfaces)
Dual I2S/SPI modules combined with DMA make the PIC32MX250F128D-I/PT a strong fit for USB audio class streaming. The 50 MHz core sustains 16-bit 48 kHz stereo with low CPU overhead, and 32 KB SRAM holds ping-pong DMA buffers for jitter-free playback. Compared to a USB audio CODEC-only solution, the integrated I2S interfaces reduce BOM cost by avoiding an external serializer. Audio path performance is limited by the 10-bit ADC if analog capture is required; for pure digital I2S input/output, the part delivers excellent quality. Common designs include USB-to-I2S adapters, headphone amplifiers with USB input, and consumer audio docks.
Recommended
Low-Cost Graphical User Interfaces (PMP LCD Displays)
The on-chip Parallel Master Port (PMP) supports 8-bit and 16-bit interface to graphical LCD controllers and external SRAM/Flash, making the PIC32MX250F128D-I/PT a frequent choice for low-cost graphical user interfaces. At 50 MHz, the core can refresh QVGA (320x240) monochrome LCDs while still servicing USB command traffic. PPS enables flexible data, address, and control line placement, which simplifies PCB layout. Designers should allocate the larger RAM for frame buffers when using color displays. Typical implementations include appliance control panels, low-cost HMI terminals, and small medical or fitness graphical products.
Recommended
Capacitive Touch Panels (mTouch Buttons and Sliders)
Built-in mTouch capacitive touch hardware lets the PIC32MX250F128D-I/PT drive multiple touch buttons and sliders without external conversion ICs. The 1 ns resolution Input Capture module combined with 16-bit timers supports precise time-domain charge measurement for robust touch sensing even in noisy industrial environments. The 50 MHz CPU handles mTouch scanning plus a USB HID or CDC interface in parallel, enabling touch panels that also stream data to a host PC. Common designs include kitchen appliance controls, audio mixer front panels, and USB-controlled touch sliders.
Recommended
Industrial Sensor Hubs (USB + I2C + SPI Aggregation)
The PIC32MX250F128D-I/PT aggregates multiple sensor streams via I2C, SPI, and UART and exposes them to a host PC over USB CDC or HID. With two I2C and two SPI modules plus 34 GPIOs, the device can serve 5 to 10 simultaneous sensors while the 50 MHz CPU runs averaging, calibration, and USB enumeration. Industrial temperature range -40 C to +85 C supports factory and outdoor installations. The PPS mapping allows signal integrity optimization by remapping peripherals away from noisy power regions. Practical examples include USB temperature/humidity loggers, multi-axis IMU bridges, and laboratory instrumentation front-ends.
Recommended
Portable Data Loggers (USB Mass Storage or CDC)
The PIC32MX250F128D-I/PT implements portable data loggers that store sensor readings to external SPI Flash and download them to a host via USB. With 32 KB of RAM for compression buffers and 128 KB Flash for the FAT12/16 stack plus application code, the device supports loggers of up to several hundred thousand samples before offload. The internal USB 2.0 full-speed transceiver delivers ~1 MB/s read throughput over CDC ACM or vendor-class bulk transfers. PPS allows the SPI Flash and SD card to share pins without conflict, and the industrial temperature range covers outdoor deployment scenarios.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX250F128D-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX170F256D-I/PT | PIC32MX230F256D-50I/PT | PIC32MX154F128D-I/PT | PIC32MX150F128D-I/PT | PIC32MX130F128H-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (10x10 mm) | TQFP-44 (10x10 mm) - same | TQFP-44 (10x10 mm) - same | TQFP-44 (10x10 mm) - same | TQFP-44 (10x10 mm) - same | TQFP-44 (10x10 mm) - same |
| Core | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| Maximum CPU Speed | 50 MHz (83 DMIPS) | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 40 MHz |
| Flash | 128 KB | 256 KB (+100%) | 256 KB (+100%) | 128 KB (same) | 128 KB (same) | 128 KB (same) |
| SRAM | 32 KB | 64 KB (+100%) | 64 KB (+100%) | 32 KB (same) | 32 KB (same) | 32 KB (same) |
| USB 2.0 FS OTG | Yes | Yes | Yes | Yes | No | No |
| PMP (Parallel Master Port) | Yes | Yes | Yes | Yes | No | No |
| Supply Voltage | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V |
| Unit Price (qty 100) | USD 5.21 | USD 5.85 | USD 6.10 | USD 5.05 | USD 4.40 | USD 4.10 |
Key Differentiators
- Integrated USB 2.0 Full-Speed OTG with internal transceiver (vs PIC32MX150F128D-I/PT)
- Parallel Master Port for direct LCD interface (vs PIC32MX150F128D-I/PT)
- Doubled Flash and RAM on same footprint for forward migration (vs PIC32MX170F256D-I/PT)
- Two I2S/SPI modules plus dedicated DMA channels (vs PIC32MX130F128H-I/PT)
Design Notes
Place a 100 nF decoupling capacitor within 3 mm of every VDD pin (pins 11, 19, 33) and within 3 mm of VDDUSB (pin 22). Add a bulk 4.7 uF tantalum capacitor near the MCLR/VUSB rail pair. The datasheet recommends keeping VUSB at 3.3 V nominal to bias the USB transceiver; tie VUSB to VDD through a ferrite bead or short trace if 3.3 V regulation is provided externally. Estimated: total decoupling budget for 34 GPIO at 50 MHz with USB active is roughly 20 mA average plus 10 mA peak during USB transactions.
Route USB DP (pin 20) and DM (pin 21) as a 90 ohm differential pair with maximum 3 mm trace width mismatch and no stubs. Keep the pair away from switching converters and keep total length under 50 mm to preserve USB 2.0 full-speed signal integrity. Per the datasheet, the internal pull-up on DP is selectable by software, but external ESD protection (such as USBLC6-2) is recommended at the connector. Mismatch in DP/DM trace length must remain below 0.5 mm to avoid jitter.
PPS (Peripheral Pin Select) functions must be unlocked, configured, and locked before enabling any peripheral that uses remappable I/O. Forgetting to call the PPS unlock macro or attempting to remap pins after the peripheral is enabled results in silent pin misrouting and intermittent digital reads. The datasheet lists restricted pin combinations; for example, certain debugger signals cannot be remapped. Estimated: roughly 30 percent of PIC32 first-time users hit a PPS-related bug during board bring-up.
The TQFP-44 package has a junction-to-ambient thermal resistance of approximately 70 C/W (without dedicated copper pad). At full 50 MHz operation plus USB traffic, the typical active power is roughly 25 mA at 3.3 V, equivalent to 83 mW. Estimated: this yields a junction temperature rise of about 5.8 C above ambient, well within the 85 C industrial ceiling. No heatsink is required for normal operation.
Keep the 8 MHz crystal traces (SOSCO/SOSCI) under 5 mm and surround them with a ground pour to minimize EMI susceptibility. Place the load capacitors within 2 mm of the oscillator pins. PPS flexibility allows relocation of the JTAG/programming pins (PGECx/PGEDx) to avoid routing near analog signals - consult the device variant pinout table. Estimated: with this layout, conducted EMI on the power rail typically stays below CISPR 22 class B limits for USB full-speed designs.
Compliance Information
RoHS and REACH compliance per Microchip product page. The part is industrial-grade -40 C to +85 C, not AEC-Q100 automotive qualified; for automotive applications consult the PIC32MX1XX/2XX family automotive variants. Halogen-free status not explicitly stated in retrieved data.
