PIC32MX250F128BT-V/SO - 32-bit MCU 128KB Flash 40MHz 28-SOIC | Microchip
MPN: PIC32MX250F128BT-V/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.65 | $5.65 |
| 10 | $5.08 | $50.80 |
| 100 | $4.52 | $452.00 |
| 500 | $4.05 | $2,025.00 |
| 1,000 | $3.62 | $3,620.00 |
PIC32MX250F128BT-V/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile working memory (SRAM), and a rich set of digital and analog peripherals. Within the broader taxonomy, this part belongs to the PIC32MX family of MIPS-based 32-bit microcontrollers, which sits inside the Microcontroller category, which itself falls under Integrated Circuits and finally Semiconductors. The M4K core implements a 32-bit load/store RISC architecture with hardware multiply/divide and a five-stage pipeline, giving PIC32MX parts a deterministic, interrupt-friendly execution model favored in real-time control.
Key differentiating features include Peripheral Pin Select (PPS), which remaps digital I/O functions to any compatible pin to ease PCB layout, two I2S/SPI modules for codec and serial communication, a Parallel Master Port (PMP) for graphics or external memory interfaces, and mTouch capacitive touch support. The 10-bit ADC and 1 ns input-capture resolution provide high-resolution analog and timing measurement for motor, sensor, and instrumentation designs. On-chip temperature measurement is also available.
Typical applications include industrial control panels, low-cost graphic HMIs via PMP, USB-enabled consumer devices, capacitive touch user interfaces, audio playback with I2S codecs, and sensor hubs in appliance or HVAC systems. The 28-SOIC footprint is friendly for hand-soldered prototypes and cost-optimized production lines where QFN reflow equipment is not required.
For designs that need additional USB or higher pin count, consider migrating within the PIC32MX family. A subtle design tip is to enable the JTAG disable fuse in production code to recover the I/O pins and protect firmware IP. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes beyond what is summarized in the manufacturer datasheet.
Drop-in alternatives for PIC32MX250F128BT-V/SO — 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 PIC32MX250F128BT-V/SO (same form factor and footprint) — differing in ADC, Package, Core Architecture, Timers, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX250F128BT-I/SO
✅ Drop-In✓ In Stock
$3.62 / Unit
View Datasheet →PIC32MX250F128B-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX250F128BT-V/ML
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX150F128BT-V/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.81 / Unit
View Datasheet →PIC32MX220F032BT-I/SO
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC32MX250F128BT-V/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| Core Count | Single-Core 32-bit |
| Maximum CPU Frequency | 40 MHz |
| DMIPS Performance | 83 DMIPS |
| Program Memory (Flash) | 128 KB (128K x 8) |
| SRAM | 32 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| ADC | 10-bit |
| I2S / SPI Modules | 2 |
| Parallel Master Port (PMP) | Yes |
| Peripheral Pin Select (PPS) | Yes |
| mTouch Capacitive Touch | Supported |
| Input Capture Resolution | 1 ns |
| On-chip Temperature Sensor | Yes |
| Active Current Consumption | 0.5 mA/MHz typical |
| Operating Temperature Range | -40 C to +105 C (V grade) |
| Package | 28-SOIC (SO) |
| Pin Count | 28 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC32MX250F128BT-V/SO Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active-low |
| Pin 2 | RA0 — Port A bit 0 / PPS-remappable I/O / analog input |
| Pin 3 | RA1 — Port A bit 1 / PPS-remappable I/O / analog input |
| Pin 4 | RB0 — Port B bit 0 / PPS-remappable I/O / analog input |
| Pin 5 | RB1 — Port B bit 1 / PPS-remappable I/O / analog input |
| Pin 6 | RB2 — Port B bit 2 / PPS-remappable I/O / analog input |
| Pin 7 | RB3 — Port B bit 3 / PPS-remappable I/O / analog input |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSCI — Crystal oscillator input or external clock |
| Pin 10 | OSCO — Crystal oscillator output |
| Pin 11 | RB4 — Port B bit 4 / PPS-remappable I/O |
| Pin 12 | RB5 — Port B bit 5 / PPS-remappable I/O |
| Pin 13 | RB6 — Port B bit 6 / PPS-remappable I/O |
| Pin 14 | RB7 — Port B bit 7 / PPS-remappable I/O |
| Pin 15 | VDD — Positive supply 2.3 V to 3.6 V |
| Pin 16 | RA2 — Port A bit 2 / PPS-remappable I/O / analog input |
| Pin 17 | RA3 — Port A bit 3 / PPS-remappable I/O / analog input |
| Pin 18 | RA4 — Port A bit 4 / PPS-remappable I/O / analog input |
| Pin 19 | RA5 — Port A bit 5 / PPS-remappable I/O / analog input |
| Pin 20 | RA6 — Port A bit 6 / PPS-remappable I/O |
| Pin 21 | RA7 — Port A bit 7 / PPS-remappable I/O |
| Pin 22 | VSS — Ground reference |
| Pin 23 | RB8 — Port B bit 8 / PPS-remappable I/O |
| Pin 24 | RB9 — Port B bit 9 / PPS-remappable I/O |
| Pin 25 | RB10 — Port B bit 10 / PPS-remappable I/O |
| Pin 26 | RB11 — Port B bit 11 / PPS-remappable I/O |
| Pin 27 | RB12 — Port B bit 12 / PPS-remappable I/O |
| Pin 28 | RB14 — Port B bit 14 / PPS-remappable I/O |
Typical Applications
PIC32MX250F128BT-V/SO is suitable for 6 applications: Industrial Control Panels, Capacitive Touch User Interfaces, Low-Cost Graphic HMI with PMP, USB Audio Playback Devices, Appliance Sensor Hubs, Battery-Connected IoT Edge Nodes.
Industrial Control Panels
The PIC32MX250F128BT-V/SO is well suited for industrial control panel designs thanks to its -40C to +105C operating range, 0.5 mA/MHz active current, and 83 DMIPS throughput at 40 MHz. The 128 KB Flash holds a full Modbus RTU master plus HMI state machine, while 32 KB SRAM buffers incoming UART frames. PMP drives character LCDs directly. PPS remaps any digital peripheral to convenient PCB pins.
Recommended
Capacitive Touch User Interfaces
The PIC32MX250F128BT-V/SO integrates Microchip's mTouch capacitive touch library support, 1 ns input-capture resolution, and 32 KB SRAM for slider/wheel decoding in capacitive touch user interfaces. The 10-bit ADC samples a charge-transfer sensor array at high rate without taxing the CPU. Low 0.5 mA/MHz active current extends runtime on battery-powered appliances with touch panels.
Recommended
Low-Cost Graphic HMI with PMP
The PIC32MX250F128BT-V/SO drives low-cost graphic HMI displays using its Parallel Master Port (PMP) at up to 40 MHz, with 128 KB Flash storing framebuffer helpers and the M4K core refreshing STN/QVGA panels without DMA. PPS lets the designer reserve more pins for touch scanning. The 28-SOIC footprint simplifies hand-rework of prototype HMIs.
Recommended
USB Audio Playback Devices
The PIC32MX250F128BT-V/SO enables USB audio playback devices using its USB Full-Speed device controller and two I2S/SPI modules for external audio codecs such as the PIC32 audio DAC family. With 128 KB Flash and 32 KB SRAM, the part runs USB HID plus a small WAV decoder comfortably. On-chip temperature sensing helps thermal foldback in amplified outputs.
Recommended
Appliance Sensor Hubs
The PIC32MX250F128BT-V/SO is a strong fit for appliance sensor hubs such as washing machines, dishwashers, and HVAC controls thanks to its -40C to +105C operating temperature and PPS-driven flexible I/O mapping. The 10-bit ADC with on-chip temperature sensor and 1 ns input-capture timer combine to monitor motor RPM, NTC thermistors, and capacitive water-level probes simultaneously with predictable interrupt latency.
Recommended
Battery-Connected IoT Edge Nodes
The PIC32MX250F128BT-V/SO is well suited to battery-connected IoT edge nodes with its 0.5 mA/MHz active current, multiple low-power sleep modes, 32 KB SRAM for queued sensor samples, and 128 KB Flash storing TLS or LoRaWAN stacks. The 10-bit ADC plus PMP handle local pre-processing before wake-and-transmit, and the -40C to +105C grade supports outdoor enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX250F128BT-V/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX250F128BT-I/SO | PIC32MX250F128B-I/SO | PIC32MX150F128BT-V/SO | PIC32MX220F032BT-I/SO |
|---|---|---|---|---|---|
| Package | 28-SOIC (SO) | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 128 KB | 128 KB | 128 KB | 128 KB | 32 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 8 KB |
| Maximum CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Temperature Range | -40 C to +105 C | -40 C to +105 C | -40 C to +85 C | -40 C to +105 C | -40 C to +85 C |
| Parallel Master Port (PMP) | Yes | Yes | Yes | No | Yes |
| Packaging Form | Tape & Reel (T suffix) | Tube (no T suffix) | Tube | Tape & Reel | Tube |
Key Differentiators
- Extended -40C to +105C temperature grade for harsh environments (vs PIC32MX250F128B-I/SO)
- PMP graphic interface retained versus PIC32MX150 family (vs PIC32MX150F128BT-V/SO)
- Eight times more Flash than the entry-level PIC32MX220 (vs PIC32MX220F032BT-I/SO)
Design Notes
Decouple VDD with a 10 uF bulk capacitor plus a 0.1 uF ceramic placed within 5 mm of each VDD/VSS pair, per the PIC32MX250 family datasheet. The internal PLL draws brief high-current pulses during frequency lock; insufficient decoupling causes core resets or analog ADC noise. Place a ferrite bead between the digital 3.3 V rail and the AVDD pin if the application uses the ADC at high sample rates.
Route the 40 MHz crystal traces on the top layer with short, symmetric traces and a guard ring tied to ground. Keep the OSCI/OSCO traces away from PWM or switching signals to avoid clock jitter. Place the crystal within 5 mm of the MCU. The 28-SOIC land pattern is generous, so pour copper on all spare area to improve heat spreading but stitch the pour with vias around the crystal traces.
The MCLR pin must be pulled high through a 10 kohm resistor and a 10 nF capacitor to ground for proper reset behavior. Floating MCLR is a common cause of intermittent start-up failures. Also configure unused I/O pins as outputs driven low, not as inputs, to avoid floating-pin current leakage that can exceed the datasheet sleep current by orders of magnitude.
Compliance Information
RoHS and REACH compliance per Microchip product declaration. Lead-free and halogen-free per the datasheet materials statement. AEC-Q100 not applicable for this general-market grade.
