PIC32MX250F128B-V/SS - 32-bit MCU 128KB Flash 32KB RAM 28-SSOP
MPN: PIC32MX250F128B-V/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.85 | $5.85 |
| 10 | $5.32 | $53.20 |
| 100 | $4.78 | $478.00 |
| 500 | $4.31 | $2,155.00 |
| 1,000 | $3.92 | $3,920.00 |
PIC32MX250F128B-V/SS Overview
What is a PIC32 microcontroller? PIC32MX devices are 32-bit MIPS-based microcontrollers from Microchip Technology belonging to the broader PIC MCU family. They occupy the mid-range of Microchip's 32-bit portfolio, sitting between the smaller PIC32MM and the more capable PIC32MZ. Their role in the system hierarchy is: MCU -> 32-bit microcontroller -> embedded processor -> semiconductor. PIC32MX parts integrate high-performance CPU cores with rich peripherals such as USB, I2S, PMP, and ADC, enabling designers to consolidate what previously required multiple ICs onto one MCU.
Key features of the PIC32MX250F128B-V/SS include two I2S/SPI modules for codec and serial communications, Peripheral Pin Select (PPS) for flexible signal routing, a Parallel Master Port (PMP) for graphics interfaces, and mTouch capacitive touch sensing support. The CTMU peripheral provides 1 ns high-resolution time measurement, and an on-chip temperature sensor enables die-level thermal monitoring. The 10-bit ADC offers up to 13 input channels and 1 Msps conversion rate for mixed-signal acquisition.
Architecturally, the device uses a Harvard-style MIPS32 core with single-cycle multiplication, 5-stage pipeline, and a dedicated prefetch cache, achieving 1.5 DMIPS/MHz. Hardware multiply/divide and a single-cycle bit manipulation engine accelerate DSP-style algorithms. The USB 2.0 Full-Speed device controller with on-chip transceiver eliminates external PHY components, while the PMP bus and I2S peripherals enable direct glueless interfaces to TFT displays and audio codecs.
Typical applications include USB HID peripherals, audio processing devices, graphics-display HMI modules, capacitive touch user interfaces, and industrial sensor hubs. The wide temperature range and rich peripheral set make it a strong fit for medical instruments, building automation, and consumer appliances requiring USB connectivity plus user feedback.
When designing with the PIC32MX250F128B-V/SS, ensure the VCAP pin decoupling is implemented exactly as specified (typically 10 µF ceramic) because the internal 1.8 V core regulator requires this for stability. Use the PPS feature to remap peripherals, but verify pin assignments during code development because not every peripheral maps to every I/O.
This page synthesizes XAIPART distributor pricing, drop-in PIC32MX alternatives, and practical design notes that are not consolidated in the Microchip datasheet.
Drop-in alternatives for PIC32MX250F128B-V/SS — 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 PIC32MX250F128B-V/SS (same form factor and footprint) — differing in Package, USB, Core Architecture, ADC, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX250F128B-I/SS
✅ Drop-In✓ In Stock
$3.17 / Unit
View Datasheet →PIC32MX250F128BT-V/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX230F128B-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX230F256B-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX150F128B-V/SS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.94 / Unit
View Datasheet →PIC32MX130F256B-I/SS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.15 / Unit
View Datasheet →PIC32MX250F128B-V/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Maximum CPU Speed | 50 MHz (83 DMIPS) |
| Program Memory (Flash) | 128 KB |
| Data Memory (SRAM) | 32 KB |
| Operating Voltage | 2.3 V to 3.6 V |
| Operating Temperature | -40 °C to +105 °C |
| Active Current Consumption | 0.5 mA/MHz typical |
| Package | 28-pin SSOP (5.30 mm) |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed Device with on-chip transceiver |
| ADC | 10-bit, up to 13 channels, 1 Msps |
| I2S/SPI Modules | 2 |
| PMP (Parallel Master Port) | Yes |
| Peripheral Pin Select (PPS) | Yes |
| CTMU (Charge Time Measurement Unit) | Yes, 1 ns resolution |
| On-chip Temperature Sensor | Yes |
| RoHS Status | Compliant |
PIC32MX250F128B-V/SS Pin Configuration
| Pin 1 | MCLR — Master clear / reset input (active low) |
| Pin 2 | PGED1/AN0/C1INC/RPB0/CTED1/RB0 — Programming data, analog input, IOC, CTMU |
| Pin 3 | PGEC1/AN1/C1INC/RPB1/CTED2/RB1 — Programming clock, analog input, IOC, CTMU |
| Pin 4 | PGED2/AN2/C2INC/RPB2/RB2 — Programming data, analog input, IOC |
| Pin 5 | PGEC2/AN3/C2INC/RPB3/RB3 — Programming clock, analog input, IOC |
| Pin 6 | AN4/C1INB/RPB4/RB4 — Analog input, IOC |
| Pin 7 | AN5/C1INA/RPB5/RB5 — Analog input, IOC |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RC12 — Oscillator crystal input or external clock input |
| Pin 10 | OSC2/CLKO/RC15 — Oscillator crystal output or clock output |
| Pin 11 | VBUS — USB bus power detect input |
| Pin 12 | D- — USB D- data line |
| Pin 13 | D+ — USB D+ data line |
| Pin 14 | VCAP — Internal 1.8V regulator output (decoupling cap) |
| Pin 15 | VDD — Positive supply voltage |
| Pin 16 | RPB15/RB15 — Remappable I/O, IOC |
| Pin 17 | RA0/SDA2/TP13 — I/O, I2C2 SDA, parallel data |
| Pin 18 | RA1/SCL2/TP14 — I/O, I2C2 SCL, parallel data |
| Pin 19 | PGED3/VREF-/CVREF-/AN6/RPB6/RB6 — Programming, VREF-, analog input, IOC |
| Pin 20 | PGEC3/VREF+/CVREF+/AN7/RPB7/RB7 — Programming, VREF+, analog input, IOC |
| Pin 21 | AN8/C1IND/RPB8/RB8 — Analog input, IOC |
| Pin 22 | AN9/C2IND/RPB9/RB9 — Analog input, IOC |
| Pin 23 | TMS/CVREF/AN10/RPB10/RB10 — JTAG TMS, VREF, analog input, IOC |
| Pin 24 | TCK/RPB11/RB11 — JTAG TCK, IOC |
| Pin 25 | TDI/RPB12/RB12 — JTAG TDI, IOC |
| Pin 26 | TDO/RPB13/RB13 — JTAG TDO, IOC |
| Pin 27 | RTCC/RPB14/RB14 — Real-time clock alarm output, IOC |
| Pin 28 | AVDD — Analog positive supply |
Typical Applications
PIC32MX250F128B-V/SS is suitable for 6 applications: USB HID Peripheral Devices, Audio Processing Devices, Graphics HMI with TFT Display, Capacitive Touch User Interfaces, Industrial Sensor Hubs, Consumer Appliance Controllers.
USB HID Peripheral Devices
The PIC32MX250F128B-V/SS is ideal for USB Human Interface Device designs such as keyboards, mice, game controllers, and custom HID peripherals because it integrates a USB 2.0 Full-Speed device controller with on-chip transceiver, eliminating external PHY circuitry. Its 50 MHz MIPS32 core executes HID class drivers plus custom report logic at low latency, and 128 KB Flash fits full USB stacks including composite-device descriptors. The Peripheral Pin Select feature allows D+/D- placement on convenient I/O pins for compact PCB layouts in cable-attached peripherals.
Recommended
Audio Processing Devices
Audio applications benefit from the PIC32MX250F128B-V/SS because it integrates two I2S modules that interface directly to audio codecs such as the WM8731 or SGTL5000, while the 50 MHz core supports 16-bit/48 kHz stereo streams and basic DSP filtering in real time. The 32 KB SRAM buffers roughly 170 ms of stereo 16-bit audio at 48 kHz, and the 10-bit ADC samples microphone or line input. USB device mode enables the part to function as a USB audio class device for headsets and USB microphones with minimal external components.
Recommended
Graphics HMI with TFT Display
Human-Machine Interface designs with small TFT displays use the PIC32MX250F128B-V/SS because the Parallel Master Port (PMP) provides 8-bit or 16-bit parallel bus interfaces to common TFT controllers such as SSD1963 or HX8347 without external glue logic. The 50 MHz core renders widgets at full frame rate, and 32 KB SRAM holds partial frame-buffers for layered graphics. PPS routes display enable, backlight PWM, and touch interrupt to any GPIO, simplifying PCB routing in compact enclosures such as appliance control panels.
Recommended
Capacitive Touch User Interfaces
The PIC32MX250F128B-V/SS is well suited to capacitive touch interfaces because its integrated Charge Time Measurement Unit (CTMU) measures capacitance changes with 1 ns resolution, supporting mTouch buttons, sliders, and proximity sensors. Combined with the 128 KB Flash and PPS, the device scans up to 13 channels in parallel with low CPU overhead. The industrial -40 °C to +105 °C range supports reliable touch operation across automotive dashboards, kitchen appliances, and outdoor kiosks where temperature swings affect sensor baselines.
Recommended
Industrial Sensor Hubs
Industrial sensor hubs leverage the PIC32MX250F128B-V/SS because the device combines 10-bit 1 Msps ADC acquisition, USB connectivity, and I2S/SPI peripherals on a single MCU. Designers can aggregate temperature, pressure, and flow data from external sensors over I2C or SPI, perform filtering on the 50 MHz core, and report aggregated data over USB-CDC or HID. The -40 °C to +105 °C operating range supports outdoor and factory environments, while the 32 KB SRAM caches telemetry bursts before transmission.
Recommended
Consumer Appliance Controllers
Consumer appliance designs use the PIC32MX250F128B-V/SS because it integrates USB for firmware updates or diagnostics, PMP for graphic displays, and CTMU for capacitive touch keypads in a single 28-SSOP device. The 128 KB Flash accommodates full application code plus USB bootloader, and the 32 KB SRAM holds display buffers and protocol state. The wide 2.3 V to 3.6 V supply range operates from rectified AC adapter rails and supports battery-backed standby modes for white-goods and small kitchen appliances.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX250F128B-V/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX250F128B-I/SS | PIC32MX230F128B-I/SS | PIC32MX230F256B-I/SS | PIC32MX150F128B-V/SS | PIC32MX130F256B-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Core | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| Maximum CPU Speed | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 40 MHz (-20%) | 40 MHz (-20%) |
| Flash Memory | 128 KB | 128 KB | 128 KB | 256 KB (+100%) | 128 KB | 256 KB (+100%) |
| SRAM | 32 KB | 32 KB | 32 KB | 16 KB (-50%) | 32 KB | 16 KB (-50%) |
| USB 2.0 Full-Speed | Yes (on-chip PHY) | Yes | No | No | No | No |
| Operating Temperature | -40 °C to +105 °C | -40 °C to +85 °C (-20 °C upper) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +105 °C | -40 °C to +85 °C |
Key Differentiators
- Higher industrial temperature range than I-grade sibling (vs PIC32MX250F128B-I/SS)
- Full USB 2.0 Full-Speed with on-chip transceiver (vs PIC32MX230F128B-I/SS)
- Higher 50 MHz CPU speed vs PIC32MX1xx family (vs PIC32MX150F128B-V/SS)
Design Notes
The PIC32MX250F128B-V/SS includes an internal 1.8 V core voltage regulator that requires a 10 µF ceramic decoupling capacitor on the VCAP pin (pin 14). Place this capacitor as close as possible to the VCAP pin with the shortest trace length to ground; X7R or X5R dielectric is recommended. The internal regulator handles all power sequencing; designers must NOT drive VCAP from an external source. Total active current consumption is approximately 0.5 mA/MHz plus peripheral contribution, so at 50 MHz expect 25-30 mA in active mode plus USB and ADC draw.
For USB applications, route the D+ (pin 13) and D- (pin 12) traces as a 90-ohm differential pair with matched length within 150 mils, and keep them away from high-frequency switching signals. Place the USB decoupling capacitor (typically 100 nF) close to the VUSB/VBUS pin. Use a common ground plane under the device and connect digital and analog grounds at a single point near the AGND pin if used. For PMP graphics interfaces, route the 8/16-bit data bus together and shield with ground on both sides.
Three common pitfalls on this device: (1) Forgetting the VCAP decoupling capacitor causes core voltage instability and random resets; (2) Configuring MCLR as an input without a pull-up prevents code execution because MCLR is internally sampled at reset; (3) Failing to configure PPS before toggling alternate peripheral I/O leaves signals mapped to default pins. Always include the configuration bits in code, define a valid configuration pragma, and verify PPS mappings in the Pin Manager tool within MPLAB X IDE before schematic release.
Compliance Information
RoHS compliant per Microchip product page. The PIC32MX250 family is not AEC-Q100 qualified; for automotive AEC-Q100 applications, Microchip offers PIC32MX1xx-Q1 series parts.
