PIC32MX675F256HT-80I/MR - 80MHz 32-bit MCU w/ Ethernet | Microchip
MPN: PIC32MX675F256HT-80I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.42 | $11.42 |
| 10 | $10.39 | $103.90 |
| 100 | $9.05 | $905.00 |
| 500 | $8.12 | $4,060.00 |
| 1,000 | $7.32 | $7,320.00 |
PIC32MX675F256HT-80I/MR Overview
A 32-bit microcontroller (MCU) is a single-chip computer that integrates a 32-bit CPU core, volatile and non-volatile memory, and a rich set of on-chip peripherals such as timers, communication controllers, ADCs, and DMA engines. Within the broader taxonomy, MCUs sit under microprocessors (MPU -> MCU -> 32-bit MCU) and are part of the embedded computing category. The PIC32MX family specifically targets connectivity-rich embedded applications, including industrial control, consumer devices, and networked embedded products. This particular PIC32MX675F256HT-80I/MR sits at the high end of the PIC32MX5/6/7 series, distinguished by its on-chip 10/100 Mbit Ethernet MAC and full-speed USB 2.0 controller.
Key features of the PIC32MX675F256HT-80I/MR include 256 KB Flash organized as 256K x 8, 64 KB RAM, eight DMA channels for low-CPU-overhead data movement, an integrated 10/100 Ethernet MAC with the necessary RMII/MII interface, USB 2.0 full-speed OTG/Friendly host-or-device controller, multiple UART/SPI/I2C peripherals, a 10-bit ADC of 16 channels, and a parallel master port for external bus expansion. The part operates from a 2.3 V to 3.6 V supply and is rated for the industrial -40C to +85C temperature range.
Architecturally, the PIC32MX675F256HT-80I/MR uses the MIPS32 M4K core with a 5-stage pipeline, hardware multiply/divide, and a single-cycle 32-bit ALU. Microchip's MPLAB Harmony framework supports the device with peripheral libraries, USB and TCP/IP stacks, and a graphical configuration tool. The Ethernet MAC connects directly to an external PHY (such as the Microchip KSZ8041) via RMII, eliminating the need for an external MAC. Eight DMA channels can service the ADC, SPI, UART, USB, and Ethernet peripherals in parallel, freeing the CPU for application logic.
Typical applications include industrial Ethernet gateways, networked sensor nodes, USB peripherals, building automation controllers, and embedded web servers. The combination of Ethernet, USB, 256 KB Flash, and 64 KB RAM is well matched to small RTOS-based designs running TCP/IP stacks.
When designing with this MCU, place the 64-pin VQFN exposed pad on a sufficiently large copper pour for thermal relief, since industrial Ethernet applications often run near 80 MHz. The Ethernet MAC requires an external 50 MHz reference clock input; ensure your PHY or oscillator circuit meets the RMII timing budget.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC32MX675F256HT-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 PIC32MX675F256HT-80I/MR (same form factor and footprint) — differing in ADC, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX675F256H-80I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX675F256HT-V/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX675F256HT-I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX695F256HT-80I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX764F256H-80I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX575F256HT-80I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX675F256HT-80I/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| Data Bus Width | 32-bit |
| Maximum Clock Frequency | 80 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| SRAM | 64 KB |
| Supply Voltage (VDD) | 2.3 V to 3.6 V |
| Operating Temperature | -40C to +85C (industrial) |
| I/O Pins | 51 |
| DMA Channels | 8 |
| Ethernet MAC | 10/100 Mbit (RMII/MII) |
| USB | USB 2.0 Full-Speed OTG |
| ADC | 10-bit, 16 channels |
| Package | 64-pin VQFN (9x9 mm) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC32MX675F256HT-80I/MR Pin Configuration
| Pin 1 | RP15/RD15 — Remappable I/O / Port D bit 15 |
| Pin 2 | RP14/RD14 — Remappable I/O / Port D bit 14 |
| Pin 3 | RP13/PMD13/RD13 — Remappable I/O / PMP data bit 13 / Port D bit 13 |
| Pin 4 | RP12/PMD12/RD12 — Remappable I/O / PMP data bit 12 / Port D bit 12 |
| Pin 5 | RP11/PMD11/RD11 — Remappable I/O / PMP data bit 11 / Port D bit 11 |
| Pin 6 | RP10/PMD10/RD10 — Remappable I/O / PMP data bit 10 / Port D bit 10 |
| Pin 7 | RP9/PMD9/RD9 — Remappable I/O / PMP data bit 9 / Port D bit 9 |
| Pin 8 | RP8/PMD8/RD8 — Remappable I/O / PMP data bit 8 / Port D bit 8 |
| Pin 9 | RP7/PMD7/RD7 — Remappable I/O / PMP data bit 7 / Port D bit 7 |
| Pin 10 | RP6/PMD6/PRD6 — Remappable I/O / PMP data bit 6 / Port D bit 6 |
| Pin 11 | RP5/PMD5/RD5 — Remappable I/O / PMP data bit 5 / Port D bit 5 |
| Pin 12 | RP4/PMD4/RD4 — Remappable I/O / PMP data bit 4 / Port D bit 4 |
| Pin 13 | RP3/PMD3/RD3 — Remappable I/O / PMP data bit 3 / Port D bit 3 |
| Pin 14 | RP2/PMD2/RD2 — Remappable I/O / PMP data bit 2 / Port D bit 2 |
| Pin 15 | RP1/PMD1/RD1 — Remappable I/O / PMP data bit 1 / Port D bit 1 |
| Pin 16 | RP0/PMD0/RD0 — Remappable I/O / PMP data bit 0 / Port D bit 0 |
| Pin 17 | AVDD — Analog positive supply |
| Pin 18 | AVSS — Analog ground |
| Pin 19 | VREF+ — ADC voltage reference positive input |
| Pin 20 | VREF- — ADC voltage reference negative input |
| Pin 21 | AN0/RB0 — Analog input 0 / Port B bit 0 |
| Pin 22 | AN1/RB1 — Analog input 1 / Port B bit 1 |
| Pin 23 | AN2/RB2 — Analog input 2 / Port B bit 2 |
| Pin 24 | AN3/RB3 — Analog input 3 / Port B bit 3 |
| Pin 25 | AN4/RB4 — Analog input 4 / Port B bit 4 |
| Pin 26 | AN5/RB5 — Analog input 5 / Port B bit 5 |
| Pin 27 | AN6/RB6 — Analog input 6 / Port B bit 6 |
| Pin 28 | AN7/RB7 — Analog input 7 / Port B bit 7 |
| Pin 29 | AN8/RB8 — Analog input 8 / Port B bit 8 |
| Pin 30 | AN9/RB9 — Analog input 9 / Port B bit 9 |
| Pin 31 | AN10/RB10 — Analog input 10 / Port B bit 10 |
| Pin 32 | AN11/RB11 — Analog input 11 / Port B bit 11 |
| Pin 33 | AN12/RB12 — Analog input 12 / Port B bit 12 |
| Pin 34 | AN13/RB13 — Analog input 13 / Port B bit 13 |
| Pin 35 | AN14/RB14 — Analog input 14 / Port B bit 14 |
| Pin 36 | AN15/RB15 — Analog input 15 / Port B bit 15 |
| Pin 37 | VSS — Digital ground |
| Pin 38 | VDD — Digital positive supply 3.3V |
| Pin 39 | OSC1/CLKI/RC15 — Crystal oscillator input / external clock input / Port C bit 15 |
| Pin 40 | OSC2/CLKO/RC14 — Crystal oscillator output / clock output / Port C bit 14 |
| Pin 41 | SOSCI/RP13/RC13 — Secondary oscillator crystal input / remappable I/O / Port C bit 13 |
| Pin 42 | SOSCO/T1CK/RP12/RC12 — Secondary oscillator crystal output / Timer1 clock / Port C bit 12 |
| Pin 43 | TMS/RA0 — JTAG Test Mode Select / Port A bit 0 |
| Pin 44 | TCK/RA1 — JTAG Test Clock / Port A bit 1 |
| Pin 45 | TDI/RA2 — JTAG Test Data In / Port A bit 2 |
| Pin 46 | TDO/RA3 — JTAG Test Data Out / Port A bit 3 |
| Pin 47 | RTCC/RA4 — Real-Time Clock Calendar output / Port A bit 4 |
| Pin 48 | SDA2/RA5 — I2C2 data / Port A bit 5 |
| Pin 49 | SCL2/RA6 — I2C2 clock / Port A bit 6 |
| Pin 50 | MCLR — Master clear reset input (active low) |
| Pin 51 | DPLL/RF6 — Digital PLL / Port F bit 6 |
| Pin 52 | OC1/RD8 — Output Compare 1 / Port D bit 8 |
| Pin 53 | IC1/RD9 — Input Capture 1 / Port D bit 9 |
| Pin 54 | OC2/RD10 — Output Compare 2 / Port D bit 10 |
| Pin 55 | IC2/RD11 — Input Capture 2 / Port D bit 11 |
| Pin 56 | U2TX/RF5 — UART2 transmit / Port F bit 5 |
| Pin 57 | U2RX/RF4 — UART2 receive / Port F bit 4 |
| Pin 58 | U1TX/RF3 — UART1 transmit / Port F bit 3 |
| Pin 59 | U1RX/RF2 — UART1 receive / Port F bit 2 |
| Pin 60 | USBID/RF1 — USB ID / Port F bit 1 |
| Pin 61 | VBUS/RF0 — USB VBUS detect / Port F bit 0 |
| Pin 62 | VDD — Digital positive supply 3.3V (second pin) |
| Pin 63 | VSS — Digital ground (second pin) |
| Pin 64 | EP — Exposed thermal pad - connect to ground |
Typical Applications
PIC32MX675F256HT-80I/MR is suitable for 6 applications: Industrial Ethernet Sensor Gateway, USB HID / CDC Peripheral Device, Building Automation Controller, Embedded Web Server / IoT Edge Node, Networked Data Acquisition System, POS Terminal / Network Printer Controller.
Industrial Ethernet Sensor Gateway
The PIC32MX675F256HT-80I/MR is ideal for industrial Ethernet sensor gateways because it integrates a 10/100 Ethernet MAC that connects directly to an external PHY such as the Microchip KSZ8041 via RMII, eliminating the need for an external MAC controller. The 256 KB Flash hosts a small TCP/IP stack (Harmony or uIP), while 64 KB RAM accommodates buffers and a lightweight RTOS. Eight DMA channels handle Ethernet packet movement without CPU overhead. Operating temperature range of -40C to +85C makes it suitable for factory-floor installation, and the 64-pin VQFN exposed pad provides sufficient thermal relief for continuous 80 MHz operation.
Recommended
USB HID / CDC Peripheral Device
For USB peripherals such as HID keyboards/mice, CDC virtual COM ports, or custom vendor-class devices, the PIC32MX675F256HT-80I/MR provides USB 2.0 full-speed OTG support and 51 GPIO pins for buttons, LEDs, and sensors. The on-chip USB controller includes an internal pull-up and on-chip transceiver, requiring only an external ESD protection array. The 80 MHz core processes USB stacks with comfortable headroom, and 64 KB RAM holds USB descriptor buffers plus application data. Engineers can pair it with the PIC32MX675F256HT-I/MR variant for industrial-grade USB peripherals.
Recommended
Building Automation Controller
In building automation, the PIC32MX675F256HT-80I/MR serves as a centralized controller for HVAC, lighting, and access-control subsystems. Ethernet MAC provides BACnet/IP or Modbus TCP connectivity to the building management system, while multiple UART/SPI/I2C interfaces connect to sensor and actuator boards. The 16-channel 10-bit ADC reads temperature, humidity, and light sensors directly. The 256 KB Flash stores BACnet object tables, scheduling rules, and configuration; 64 KB RAM handles real-time scheduling.
Recommended
Embedded Web Server / IoT Edge Node
The PIC32MX675F256HT-80I/MR can host a small embedded web server using Microchip's Harmony TCP/IP lite stack, providing browser-based configuration pages for industrial equipment. The Ethernet MAC enables HTTP and MQTT-over-TCP, while the USB port supports local debugging or Wi-Fi-dongle attachment. 256 KB Flash accommodates a static web interface plus API endpoints; 64 KB RAM handles socket buffers and the HTTP request parser. The exposed-pad VQFN-64 package keeps the BOM footprint compact for DIN-rail or wall-mount enclosures.
Recommended
Networked Data Acquisition System
For multi-channel data acquisition with Ethernet upload, the PIC32MX675F256HT-80I/MR combines a 16-channel 10-bit ADC at up to 1 Msps with DMA-driven acquisition and Ethernet transmission. The eight DMA channels can simultaneously service the ADC, SPI to a front-end amplifier chain, and the Ethernet MAC, freeing the CPU to perform calibration and statistics. 256 KB Flash stores calibration tables and command-set firmware; 64 KB RAM provides sample buffers. Industrial temperature range supports use in field cabinets.
Recommended
POS Terminal / Network Printer Controller
Point-of-sale terminals and networked receipt printers benefit from the PIC32MX675F256HT-80I/MR's combination of Ethernet, USB, and 51 GPIO. Ethernet handles payment-gateway communication, USB connects to peripherals like barcode scanners or NFC readers, and the GPIO bank drives thermal printer heads and customer displays. The 80 MHz MIPS32 M4K core processes XML-formatted receipt data, and the 64 KB RAM holds print buffers for rasterized line data without external memory expansion.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX675F256HT-80I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX675F256H-80I/MR | PIC32MX675F256HT-V/MR | PIC32MX695F256HT-80I/MR | PIC32MX764F256H-80I/MR | PIC32MX575F256HT-80I/MR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | VQFN-64 (MR) 9x9 | VQFN-64 (MR) 9x9 - same | VQFN-64 (MR) 9x9 - same | VQFN-64 (MR) 9x9 - same | VQFN-64 (MR) 9x9 - same | VQFN-64 (MR) 9x9 - same |
| Core | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| Max Clock Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB |
| RAM | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| Ethernet MAC | Yes (10/100) | Yes (10/100) | Yes (10/100) | Yes (10/100) | Yes (10/100) | No |
| USB | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG + Host | USB 2.0 FS OTG |
| CAN | No | No | No | Yes | No | No |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +105C (automotive) | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated 10/100 Ethernet MAC eliminates external MAC chip (vs PIC32MX575F256HT-80I/MR)
- Industrial temperature rating with tape-and-reel packaging (vs PIC32MX675F256H-80I/MR)
- 8 DMA channels for off-CPU peripheral data movement (vs PIC32MX764F256H-80I/MR)
Design Notes
The 64-pin VQFN-64 (MR) package exposes a thermal pad (EP, pin 64) that MUST be soldered to a continuous ground plane of at least 1 square inch of copper for reliable thermal relief. At 80 MHz operation with all peripherals active, the device dissipates approximately 0.5 W internally; without adequate copper, junction temperature can rise to unsafe levels especially at upper industrial temperature limits. Use thermal vias under the EP to connect to inner ground planes for improved heat spreading.
Place a 0.1 uF ceramic decoupling capacitor within 3 mm of each VDD pin (pins 38 and 62) plus a bulk 4.7 uF tantalum or ceramic near the supply entry point. The analog AVDD pin (pin 17) requires its own 0.1 uF + 10 uF filter network; if the ADC is unused, AVDD can be tied directly to VDD but VREF+ and VREF- should be bypassed. Use a ferrite bead between digital VDD and analog AVDD to reduce switching noise coupling into ADC measurements.
Route the Ethernet RMII signals (ECRS, ETXD0, ETXD1, ETXEN, ERXD0, ERXD1, ERXDV, EREFCLK, EMDC, EMDIO) as a matched-length bus within 2 mm of each other on the same routing layer. Keep the 50 MHz reference clock trace to the PHY less than 25 mm and surround it with ground. The USB DP/DM traces should be 90 ohm differential and routed to within 3 mm of the connector, with a common-mode choke and ESD array placed close to the connector.
The 80 MHz MIPS32 M4K core generates harmonics up to several hundred MHz; place a ferrite bead or pi-filter on each supply rail entering the MCU section to prevent noise injection back into analog circuits. For Ethernet applications, the RMII bus and the 50 MHz reference clock are the most EMI-sensitive nets - keep them short and isolated from switching power and clock traces.
Do not leave the MCLR pin floating - tie it to VDD through a 10 kohm resistor and add a 100 nF cap to ground for reset debouncing. When using the Ethernet MAC, the 50 MHz reference clock must be enabled BEFORE the MAC is configured in software, otherwise the MAC will not bring up the link. Also ensure the oscillator startup delay is respected after a power-on reset before configuring peripherals, especially the USB controller which requires a stable clock within 100 ppm.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified in the standard -I variant; the automotive -V variant (PIC32MX675F256HT-V/MR) is AEC-Q100 qualified. Lead-free and halogen-free package per datasheet ordering information.
