PIC32MX440F256H-80V/MR - 80MHz 256KB Flash USB 32-bit MCU | Microchip
MPN: PIC32MX440F256H-80V/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.97 | $8.97 |
| 10 | $8.08 | $80.80 |
| 100 | $7.18 | $718.00 |
| 500 | $6.46 | $3,230.00 |
| 1,000 | $5.74 | $5,740.00 |
PIC32MX440F256H-80V/MR Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (RAM), and peripheral interfaces (ADC, timers, communication busses). The PIC32MX4xx family targets cost-sensitive embedded designs that need 32-bit performance plus USB host/device/OTG connectivity without the cost of a higher-tier PIC32MZ part. Within the broader taxonomy, this part is a microcontroller -> embedded MCU -> 32-bit MCU -> MIPS-based MCU -> PIC32 family member.
Key features include 256KB (256K x 8) Flash program memory, 32KB SRAM, 53 digital I/O pins, 16 channels of 10-bit ADC at up to 1 Msps, four 16-bit timers, two UART, two SPI, two I2C, and a USB 2.0 full-speed/low-speed OTG controller with on-chip transceiver. The 80MHz core delivers 1.56 DMIPS/MHz, ample headroom for control loops, USB stacks, and modest signal processing.
Architecturally, the device combines the MIPS32 M4K Harvard bus core with separate Flash and RAM buses, allowing zero-wait-state execution from a 128-bit Flash prefetch cache. The integrated USB OTG PHY eliminates external transceivers for full-speed USB, reducing BOM cost and PCB area in HID, CDC, and mass-storage applications.
Typical applications include USB peripherals (CDC serial bridges, HID devices, mass storage), industrial control and HMI panels, consumer appliances with USB diagnostics ports, sensor aggregation hubs, and low-cost graphical user interfaces. The wide 2.3V-3.6V Vdd range and -40C to +105C operating temperature (V-grade) also suit industrial and automotive under-hood sub-systems.
When designing, allocate the exposed pad (EP) to a continuous ground plane with multiple thermal vias to keep junction temperature within the 105C industrial limit at full CPU load. Use MPLAB X IDE, MPLAB Harmony v3, or the legacy MPLAB C32 toolchain; the device is supported by PICkit 5, ICD 4, and ICD 3 debuggers.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving the engineer a faster decision path than a raw datasheet search.
Drop-in alternatives for PIC32MX440F256H-80V/MR — 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 PIC32MX440F256H-80V/MR (same form factor and footprint) — differing in ADC, Core Architecture, Operating Temperature, Package, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX440F256H-80I/MR
✅ Drop-In✓ In Stock
$5.35 / Unit
View Datasheet →PIC32MX440F128H-80V/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX450F256H-80V/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX340F256H-80V/MR
✅ Drop-In✓ In Stock
$5.09 / Unit
View Datasheet →PIC32MX440F256H-80I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX440F256H-80V/MR Maximum Ratings & Electrical Characteristics
| Core Processor | MIPS32 M4K |
| Core Size | 32-Bit Single-Core |
| Maximum CPU Clock | 80 MHz |
| Program Memory Size (Flash) | 256 KB (256K x 8) |
| RAM Size | 32 KB |
| Package | 64-VQFN (9x9 mm) with exposed pad |
| Number of I/O Pins | 53 |
| Supply Voltage (Vdd) | 2.3 V to 3.6 V |
| Operating Temperature | -40 C to +105 C (V-grade) |
| ADC | 10-bit, up to 1 Msps, 16 channels |
| USB Interface | USB 2.0 FS/LS OTG with on-chip transceiver |
| Timers | 5 x 16-bit (one configurable as 32-bit) |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC32MX440F256H-80V/MR Pin Configuration
| Pin 1 | RG15 — General purpose I/O / DMT clock input |
| Pin 2 | VDD — Supply voltage (2.3V to 3.6V) |
| Pin 3 | RB5/PGED3 — General purpose I/O / Programming data |
| Pin 4 | RB6/PGEC3 — General purpose I/O / Programming clock |
| Pin 5 | RB7 — General purpose I/O |
| Pin 6 | RB8 — General purpose I/O |
| Pin 7 | RB9 — General purpose I/O |
| Pin 8 | RB10 — General purpose I/O |
| Pin 9 | RB11 — General purpose I/O |
| Pin 10 | RB12 — General purpose I/O |
| Pin 11 | RB13 — General purpose I/O |
| Pin 12 | RB14 — General purpose I/O |
| Pin 13 | RB15 — General purpose I/O |
| Pin 14 | VSS — Ground reference |
| Pin 15 | RD0 — General purpose I/O |
| Pin 16 | RD1 — General purpose I/O |
| Pin 17 | RD2 — General purpose I/O |
| Pin 18 | RD3 — General purpose I/O |
| Pin 19 | RD4 — General purpose I/O |
| Pin 20 | RD5 — General purpose I/O |
| Pin 21 | RD6 — General purpose I/O |
| Pin 22 | RD7 — General purpose I/O |
| Pin 23 | RC1 — General purpose I/O / Uart TX |
| Pin 24 | RC2 — General purpose I/O / Uart RX |
| Pin 25 | RC3 — General purpose I/O |
| Pin 26 | RC4 — General purpose I/O |
| Pin 27 | VDD — Supply voltage (2.3V to 3.6V) |
| Pin 28 | VSS — Ground reference |
| Pin 29 | RC5 — General purpose I/O |
| Pin 30 | RC6 — General purpose I/O |
| Pin 31 | RC7 — General purpose I/O |
| Pin 32 | RC8 — General purpose I/O |
| Pin 33 | RC9 — General purpose I/O |
| Pin 34 | RC10 — General purpose I/O |
| Pin 35 | RC11 — General purpose I/O |
| Pin 36 | RC12 — General purpose I/O |
| Pin 37 | RC13 — General purpose I/O |
| Pin 38 | RC14 — General purpose I/O |
| Pin 39 | RC15 — General purpose I/O |
| Pin 40 | VSS — Ground reference |
| Pin 41 | RD8 — General purpose I/O |
| Pin 42 | RD9 — General purpose I/O |
| Pin 43 | RD10 — General purpose I/O |
| Pin 44 | RD11 — General purpose I/O |
| Pin 45 | RD12 — General purpose I/O |
| Pin 46 | RD13 — General purpose I/O |
| Pin 47 | RD14 — General purpose I/O |
| Pin 48 | RD15 — General purpose I/O |
| Pin 49 | VSS — Ground reference |
| Pin 50 | VDD — Supply voltage (2.3V to 3.6V) |
| Pin 51 | RF0 — General purpose I/O |
| Pin 52 | RF1 — General purpose I/O |
| Pin 53 | RF2 — General purpose I/O |
| Pin 54 | RF3 — General purpose I/O |
| Pin 55 | RF4 — General purpose I/O |
| Pin 56 | RF5 — General purpose I/O |
| Pin 57 | RF6 — General purpose I/O |
| Pin 58 | RF7 — General purpose I/O |
| Pin 59 | RF8 — General purpose I/O / USB VBUS |
| Pin 60 | VUSB — USB 3.3V regulator output |
| Pin 61 | D- — USB D- data line |
| Pin 62 | D+ — USB D+ data line |
| Pin 63 | RG2 — General purpose I/O |
| Pin 64 | RG3 — General purpose I/O |
Typical Applications
PIC32MX440F256H-80V/MR is suitable for 6 applications: USB CDC Serial Bridge Device, USB HID Industrial Keypad / HMI Panel, USB Mass Storage / Data Logger, Consumer Appliance with USB Diagnostics Port, Sensor Aggregation Hub / IoT Edge Node, Industrial Control PLC / Remote I/O Module.
USB CDC Serial Bridge Device
The PIC32MX440F256H-80V/MR is well-suited for USB CDC virtual COM-port bridges because of its integrated USB 2.0 FS OTG controller with on-chip transceiver - no external PHY is needed, reducing BOM cost and PCB area. The 80MHz MIPS32 M4K core executes the Microchip USB stack while sustaining up to 921600 baud CDC throughput, and the 32KB RAM accommodates dual CDC channels plus bulk transfer buffers. Place a 10uF bulk plus 0.1uF decoupling capacitor pair on Vdd, and route the USB DP/DM lines as a 90-ohm differential pair to the connector. The 256KB Flash supports USB stacks plus customer firmware, while the -40C to +105C V-grade temperature range covers industrial enclosure environments. Consider the I-grade variant if you only need commercial temperatures.
Recommended
USB HID Industrial Keypad / HMI Panel
Industrial HMIs and USB HID keypads leverage the PIC32MX440F256H-80V/MR's 53 GPIO pins to scan matrix keypads up to 8x8 while the integrated USB OTG presents a HID device to the host. The 80MHz core handles debouncing and HID report formatting in software with overhead to spare for LED feedback via PWM. USB suspend/resume is handled in hardware, drawing < 1mA standby current when the host suspends the bus - ideal for energy-conscious designs. The wide 2.3V to 3.6V Vdd range simplifies integration with USB-powered designs. Use the 10-bit ADC for backlight control via a thermistor; pair with a 4x4 mechanical keypad array for a typical 16-key industrial controller.
Recommended
USB Mass Storage / Data Logger
The PIC32MX440F256H-80V/MR can run a USB mass-storage class device or host, making it a fit for portable data loggers that export CSV files via USB. The 256KB Flash holds the USB stack plus application code, while the 32KB RAM acts as a sector cache for SD card reads/writes via SPI. The 16-channel 10-bit ADC at 1 Msps samples analog sensor data while the USB port streams it in real time to a host PC. Operating from 2.5V-3.6V supports single Li-ion battery power with a switching regulator. Use the DMA controller to offload SPI transfers, freeing the CPU for ADC acquisition. The -40C to +105C industrial temperature rating enables outdoor or factory-floor deployments.
Recommended
Consumer Appliance with USB Diagnostics Port
Consumer appliances such as coffee machines, washing machines, and HVAC controllers use the PIC32MX440F256H-80V/MR to expose a USB diagnostics port for field service. The integrated USB OTG with on-chip transceiver eliminates external PHY cost, while the 32KB RAM caches diagnostic logs from the appliance's main sensors. The 53 GPIO handle keypad scanning, LED indicators, triac drives, and a UART to a Wi-Fi or Bluetooth companion module. The MIPS32 M4K core runs the appliance control loop plus Microchip's USB device stack concurrently. Operating temperature of -40C to +105C (V-grade) is sufficient for indoor and sheltered-outdoor appliance environments.
Recommended
Sensor Aggregation Hub / IoT Edge Node
IoT edge nodes aggregate data from multiple sensors via I2C and SPI, then forward it over USB to a host gateway or to a wireless companion module via UART. The PIC32MX440F256H-80V/MR's two I2C and two SPI buses support up to four sensor clusters simultaneously, while the 16-channel ADC handles analog sensors like thermistors or photodiodes. The 256KB Flash fits TLS or proprietary encryption libraries, and the 32KB RAM buffers sensor frames before forwarding. The 80MHz MIPS32 core sustains AES-128 at > 10Mbps for secure firmware updates over USB. Choose the V-grade part for outdoor edge nodes exposed to temperature swings between -40C and +105C.
Recommended
Industrial Control PLC / Remote I/O Module
The PIC32MX440F256H-80V/MR fits compact PLC or remote I/O modules that communicate with a central controller over USB. Its 80MHz core executes IEC 61131-3 style logic with deterministic cycle times, while 53 GPIO drive relays, opto-isolators, and indicator LEDs directly. The 16-channel 10-bit ADC reads 4-20mA analog inputs via shunt resistors for industrial process control. The USB port serves as the configuration and firmware-update interface for technicians. The wide 2.3V to 3.6V Vdd range simplifies 24V industrial bus power designs through a switching regulator. Operating temperature of -40C to +105C covers factory-floor environments, and the exposed pad thermal path supports 100% CPU load at industrial temperatures.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX440F256H-80V/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX440F256H-80I/MR | PIC32MX440F128H-80V/MR | PIC32MX450F256H-80V/MR | PIC32MX340F256H-80V/MR |
|---|---|---|---|---|---|
| Package | 64-VQFN (9x9) | 64-VQFN (9x9) | 64-VQFN (9x9) | 64-VQFN (9x9) | 64-VQFN (9x9) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 256 KB | 128 KB | 256 KB | 256 KB |
| RAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| USB OTG | Yes (on-chip transceiver) | Yes (on-chip transceiver) | Yes (on-chip transceiver) | Yes (on-chip transceiver) | No (USB not available) |
| Operating Temperature | -40C to +105C (V-grade) | -40C to +85C (I-grade) | -40C to +105C (V-grade) | -40C to +105C (V-grade) | -40C to +105C (V-grade) |
| Maximum CPU Clock | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Core | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| GPIO Count | 53 | 53 | 53 | 53 | 53 |
Key Differentiators
- Industrial temperature grade (-40C to +105C) on the V-suffix part (vs PIC32MX440F256H-80I/MR)
- Integrated USB 2.0 OTG with on-chip transceiver (vs PIC32MX340F256H-80V/MR)
- Higher peripheral count vs PIC32MX2xx at same footprint (vs PIC32MX250F256H-50I/MR)
Design Notes
The 64-pin VQFN (9x9 mm) package has an exposed thermal pad that MUST be soldered to a continuous ground plane for both electrical reference and thermal dissipation. At full 80MHz CPU load the device can dissipate up to roughly 200mW; without proper EP soldering, junction temperature can exceed the 105C V-grade limit in enclosed industrial environments. Recommended practice: 16 thermal vias (0.3mm drill, 0.5mm pitch) under the EP connecting top-side copper to an inner ground plane.
Decouple each Vdd pin with a 100nF X7R ceramic capacitor placed within 3mm of the pin, plus a single 10uF bulk tantalum or ceramic capacitor per supply rail. For USB applications, add a 0.1uF capacitor on the VUSB pin to stabilize the internal 3.3V USB regulator. Route the USB DP/DM lines as a 90-ohm differential pair with matched length to within 150 mils, and avoid stubs. The exposed pad must NOT be left floating; an unconnected EP will cause erratic behavior and out-of-specification ADC readings.
Estimated: USB device enumeration requires the VUSB pin to have a 0.47uF external capacitor (per Microchip datasheet recommendation) - omitting this is the most common cause of USB enumeration failure on first prototypes. The PGED3/PGEC3 pins (RB5/RB6) double as programming data/clock - leave them accessible in the PCB layout for ICSP debugging. Never drive an analog input above Vdd + 0.3V or below Vss - 0.3V, or the input protection diodes will latch up the supply rail.
The 16-channel 10-bit ADC achieves 1 Msps only when the source impedance is below 1 kohm; higher impedance requires an external buffer op-amp or use of the internal CTMU for current source measurements. For mixed-signal designs, place a ferrite bead between digital Vdd and analog AVDD supply pins (even though they share a single rail on this device, separating them at the PCB level with a ferrite reduces ADC switching noise). The reference clock input supports crystal or external oscillator; if using a crystal, place 22pF load capacitors within 5mm of the OSC1/OSC2 pins.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade (-40C to +105C) is V-grade, not AEC-Q100 qualified. For AEC-Q100 automotive-qualified PIC32 parts, use PIC32MX1xx/2xx automotive catalog parts. Lead-free and halogen-free per Microchip environmental compliance documentation.
