PIC32MX340F256H-80I/MR - 80MHz 32-bit MCU 256KB Flash | Microchip
MPN: PIC32MX340F256H-80I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.95 | $6.95 |
| 10 | $6.2 | $62.00 |
| 100 | $5.45 | $545.00 |
| 500 | $4.9 | $2,450.00 |
| 1,000 | $4.35 | $4,350.00 |
PIC32MX340F256H-80I/MR Overview
What is a 32-bit microcontroller? A 32-bit microcontroller (MCU) is an integrated circuit combining a CPU, memory, and peripherals around a data path that processes 32-bit words per instruction. The PIC32MX3xx/4xx family uses the MIPS M4K core, a RISC architecture providing single-cycle multiplication, hardware multiply-accumulate (MAC) support, and deterministic interrupt latency. Compared with 8-bit MCUs, 32-bit parts deliver higher throughput, larger addressable memory, and richer peripheral sets for industrial, consumer, and USB-connected applications.
Key features include a 32-bit MIPS M4K core with up to 80 MHz operation (1.56 DMIPS/MHz), 256 KB Flash program memory, 32 KB SRAM, an on-chip DMA controller for CPU-offloaded data movement, a 10-bit ADC with up to 16 channels, USB 2.0 full-speed device with integrated transceiver, and CAN 2.0B active for automotive/industrial networking. The 64-pin VQFN (MR) package provides a small footprint and good thermal dissipation for space-constrained designs.
The PIC32MX340F256H-80I/MR utilizes a Harvard architecture with separate 32-bit instruction and data buses, and includes a prefetch cache module for Flash memory to mask access latency. The integrated DMA works with the parallel bus and serial peripherals to keep the CPU free for application code. The 16-bit wide instruction path supports C-compiled code from MPLAB XC32 with hardware FPU-less floating-point emulation, suitable for control loops and protocol stacks.
Typical applications include USB HID/CDC devices, CAN-connected industrial sensor nodes, industrial control panels, low-cost graphics interfaces, embedded audio processing, and general-purpose 32-bit replacements for legacy 8/16-bit MCUs. The wide peripheral set lets designers consolidate external logic into a single chip.
When designing with this MCU, ensure the VDD/VSS pin pairs are properly bypassed with 100 nF and 10 uF capacitors placed close to the package, and consider using the on-chip DMA to offload ADC and serial traffic. The 80 MHz operation at 3.3 V (typical) draws about 70 mA active, so power budgeting should account for I/O sink/source currents.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes beyond what the manufacturer datasheet covers, including thermal dissipation, USB bus considerations, and a comparison with PIC32MX3xx variants. Engineers evaluating the PIC32MX340 family benefit from this consolidated view when planning migrations or BOM reductions.
Drop-in alternatives for PIC32MX340F256H-80I/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 PIC32MX340F256H-80I/MR (same form factor and footprint) — differing in Core Architecture, ADC, I2C, Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX340F256HT-80I/MR
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →PIC32MX340F256H-80V/MR
✅ Drop-In✓ In Stock
$5.09 / Unit
View Datasheet →PIC32MX340F128HT-80I/MR
✅ Drop-In✓ In Stock
$4.12 / Unit
View Datasheet →PIC32MX340F256H-80I/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Maximum Clock Frequency | 80 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM | 32 KB |
| Operating Voltage (VDD) | 2.5 V to 3.6 V |
| I/O Pins | 53 |
| ADC | 10-bit, up to 16 channels |
| DMA Channels | Yes (integrated DMA controller) |
| USB | USB 2.0 Full-Speed Device with on-chip transceiver |
| CAN | CAN 2.0B active |
| UART | Multiple UART modules |
| SPI | Multiple SPI modules |
| I2C | Multiple I2C modules |
| Timers | Multiple 16-bit timers + 32-bit timer |
| Operating Temperature Range | -40C to +85C (Industrial, 'I') |
| Package | 64-VQFN (MR) 9x9 mm |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Lead Free, RoHS Compliant (per DigiKey listing) |
| Voltage Regulator | On-chip 3.3V LDO |
PIC32MX340F256H-80I/MR 64-vqfn (mr) 9x9 mm Pin Configuration Guide
Pin configuration for PIC32MX340F256H-80I/MR (64-vqfn (mr) 9x9 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC32MX340F256H-80I/MR.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC32MX340F256H-80I/MR is suitable for 6 applications: USB HID/CDC Peripherals, CAN 2.0B Industrial Networking, Industrial Sensor Hubs, USB-Connected Data Acquisition, Consumer Audio Processing, HMI Control Panels.
USB HID/CDC Peripherals
The PIC32MX340F256H-80I/MR is well suited for USB Human Interface Devices (HID) and Communication Device Class (CDC) peripherals because it integrates a USB 2.0 Full-Speed device with on-chip transceiver, eliminating external PHY components. The 80 MHz MIPS M4K core delivers sufficient throughput for HID report parsing, while 256 KB Flash accommodates USB descriptors and class drivers from the Microchip USB stack. Per Microchip datasheet DS61143H, designers connect D+/D- directly to USB lines with proper 15K pull-down resistors and 22-ohm series termination. Compared to lower-end 8-bit MCUs requiring external USB-to-UART bridges, this part reduces BOM cost and PCB area.
Recommended
CAN 2.0B Industrial Networking
Industrial CAN bus nodes benefit from the PIC32MX340F256H-80I/MR's CAN 2.0B active controller and 80 MHz processing throughput. According to Microchip datasheet DS61143H, the on-chip CAN module supports standard 11-bit and extended 29-bit identifiers with hardware acceptance filtering, enabling efficient sensor and actuator node designs. The 256 KB Flash holds CANopen or DeviceNet protocol stacks, and the on-chip DMA offloads message buffering from the CPU for time-critical traffic. Operating from 2.5-3.6 V suits 3.3V industrial bus transceivers like the MCP2551, while the 53 I/O pins handle multiple sensors per node.
Recommended
Industrial Sensor Hubs
The PIC32MX340F256H-80I/MR is suitable for industrial multi-sensor hubs because the 10-bit ADC supports up to 16 input channels and the on-chip DMA controller can stream ADC conversions into RAM without CPU intervention. Per Microchip datasheet DS61143H, the 53 I/O pins let designers connect temperature, pressure, and flow sensors via SPI, I2C, and analog inputs on a single MCU. The 80 MHz core executes sensor fusion algorithms fast enough for 1 kHz loop rates, and 256 KB Flash accommodates application code plus over-the-air firmware updates for long lifecycle industrial installations.
Recommended
USB-Connected Data Acquisition
Data acquisition modules using the PIC32MX340F256H-80I/MR leverage its USB 2.0 Full-Speed device interface to stream digitized sensor data to a host PC at up to 12 Mbps. The on-chip DMA engine transfers ADC samples directly to USB endpoints, freeing the 80 MHz CPU for filtering and FFT preprocessing in real time. Per Microchip datasheet DS61143H, the 10-bit ADC combined with the 32 KB SRAM buffer supports continuous sampling rates sufficient for vibration analysis and audio band measurement. Designers often pair this MCU with external op-amps for signal conditioning, creating compact USB-powered DAQ sticks.
Recommended
Consumer Audio Processing
Consumer audio products like USB speakers, headphone DACs, and MIDI controllers benefit from the PIC32MX340F256H-80I/MR's USB audio device class support and 80 MHz MIPS throughput. According to Microchip datasheet DS61143H, the integrated I2S or SPI peripherals drive external audio DACs while the CPU handles USB streaming and basic DSP effects. The 256 KB Flash stores USB audio class drivers plus custom DSP code, while 32 KB RAM provides I2S buffer space for low-latency playback. Compared to dedicated audio processors, this MCU reduces BOM cost when a USB host interface is already required.
Recommended
HMI Control Panels
Human-machine interface panels using the PIC32MX340F256H-80I/MR take advantage of the 80 MHz core for driving TFT LCDs, scanning keypads, and managing CAN/USB communication simultaneously. Per Microchip datasheet DS61143H, the parallel master port (PMP) interface connects to common LCD controller chips, while the 53 I/O pins support matrix keypads, LEDs, and rotary encoders. The 256 KB Flash fits LVGL or proprietary graphics libraries for menu systems, and 32 KB RAM holds frame buffer segments. The industrial temperature grade (-40C to +85C 'I' suffix) makes this part suitable for factory-floor equipment.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX340F256H-80I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX340F256HT-80I/MR | PIC32MX340F256H-80V/MR | PIC32MX340F128HT-80I/MR |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-VQFN (MR) 9x9 mm | 64-VQFN (MR) 9x9 mm - same | 64-VQFN (MR) 9x9 mm - same | 64-VQFN (MR) 9x9 mm - same |
| Core | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit |
| Max Clock Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 128 KB (-50%) |
| RAM | 32 KB | 32 KB | 32 KB | 32 KB |
| Operating Voltage | 2.5 V to 3.6 V | 2.5 V to 3.6 V | 2.5 V to 3.6 V | 2.5 V to 3.6 V |
| I/O Pins | 53 | 53 | 53 | 53 |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +105C | Industrial -40C to +85C |
Key Differentiators
- Identical silicon with tape orientation variant (vs PIC32MX340F256HT-80I/MR)
- 256 KB Flash vs 128 KB in same package (vs PIC32MX340F128HT-80I/MR)
- Industrial temperature grade option (vs PIC32MX340F256H-80V/MR)
Design Notes
The PIC32MX340F256H-80I/MR requires VDD between 2.5 V and 3.6 V. Place a 10 uF bulk tantalum or ceramic capacitor near the VDD/VSS pin pair, with a 100 nF ceramic decoupling cap adjacent to each power pin pair. Per Microchip datasheet DS61143H, the on-chip voltage regulator still requires proper external decoupling. Active current consumption is approximately 70 mA at 80 MHz, so power supply design must support peak loads during USB enumeration bursts.
The 64-VQFN (MR) package requires thermal vias under the exposed pad for proper heat dissipation. Stitch at least 9 thermal vias (0.3 mm drill, 0.5 mm pitch) connecting the EP to internal ground planes. Keep D+/D- traces short and length-matched within 2 mm to maintain USB signal integrity. Place the 12 MHz crystal or external oscillator within 5 mm of the OSC1/OSC2 pins with a guard ring to ground.
Do not assume the on-chip regulator eliminates the need for an external 3.3V rail - the MCU itself is powered from VDD directly. Configure the system clock using the OSCCON register before any peripheral access, or peripherals may operate unpredictably. When migrating from PIC32MX3xx to PIC32MX4xx variants, verify the USB pin mapping differs slightly; consult the family datasheet DS61143H pinout tables for correct ball assignments.
Compliance Information
Lead-free and RoHS compliant per DigiKey product listing (2081904). Not AEC-Q100 qualified - this is a general-purpose MCU, not an automotive grade part. For AEC-Q100 qualified alternatives, look at PIC32MK automotive family.
