PIC32MX675F256H-80V/PT - 80MHz 32-bit MCU USB-OTG Ethernet 256KB | Microchip
MPN: PIC32MX675F256H-80V/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.42 | $11.42 |
| 10 | $10.27 | $102.70 |
| 100 | $8.65 | $865.00 |
| 500 | $7.42 | $3,710.00 |
| 1,000 | $6.58 | $6,580.00 |
PIC32MX675F256H-80V/PT Overview
A 32-bit MCU (microcontroller unit) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and peripherals. PIC32MX sits in Microchip's mid-range 32-bit family (lineage: PIC32MX -> PIC32 -> 32-bit MCU -> microcontroller -> embedded processor). It targets connectivity-rich embedded designs, sitting above 8-bit PIC16/PIC18 and below higher-end Cortex-M and Cortex-A parts, balancing performance, peripherals, and cost.
Key features include 51 digital I/O lines, a 16-channel 10-bit ADC at 1 Msps, four 16-bit timer/counters, two I2C, two SPI, two UART, and four dedicated DMA channels for USB OTG. The supply range is 2.3 V to 3.6 V (operating core 2.5 V to 3.6 V), industrial -40 C to +105 C operating temperature (V suffix), and JTAG/ICSP debug with trace. The 80V suffix denotes the 80 MHz speed grade and the V = -40 C to +105 C industrial extended temperature window.
Architecturally, the PIC32MX uses the MIPS M4K core, which executes most MIPS32 instructions in a single cycle and provides hardware multiply/divide and DSP extensions. Harvard architecture separates instruction and data paths, enabling simultaneous fetch and memory access. The dedicated DMA engine offloads USB OTG and memory-to-memory transfers from the CPU, freeing MIPS for application code.
Typical applications include industrial Ethernet gateways, USB-OTG device/host controllers, building automation nodes, and embedded web servers. The combination of integrated Ethernet MAC, USB OTG with PHY, and ample RAM makes this part well suited for connected appliances, point-of-sale terminals, and remote sensor concentrators. The V temperature grade supports outdoor and factory-floor deployments.
When designing with this MCU, allocate decoupling capacitors near each VDD/VSS pair, route the 50 MHz Ethernet reference clock with controlled impedance, and reserve area for the 32 kHz secondary oscillator if RTC operation is required. Use MPLAB Harmony to configure the USB OTG and Ethernet stacks; without it the firmware effort roughly doubles.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC32MX675F256H-80V/PT — 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 PIC32MX675F256H-80V/PT (same form factor and footprint) — differing in ADC, Operating Temperature, Package, USB, DMA Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX675F256H-80I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX675F256H-80V/MR
✅ Drop-In✓ In Stock
$4.62 / Unit
View Datasheet →PIC32MX675F256HT-80V/PT
✅ Drop-In✓ In Stock
$3.62 / Unit
View Datasheet →PIC32MX575F256H-80V/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX795F512L-80V/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX675F256H-80V/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| Core Frequency | 80 MHz |
| Performance | 105 DMIPS |
| Program Memory (Flash) | 256 KB |
| Data Memory (SRAM) | 64 KB |
| Operating Voltage (Core) | 2.5 V to 3.6 V |
| Operating Voltage (I/O) | 2.3 V to 3.6 V |
| Operating Temperature | -40 C to +105 C (V grade) |
| I/O Pins | 51 |
| ADC | 10-bit, 16-channel, 1 Msps |
| USB | USB 2.0 On-The-Go with on-chip PHY |
| Ethernet | 10/100 Mbps MAC with MII/RMII |
| DMA Channels | 4 (dedicated for USB OTG) |
| UART / SPI / I2C | 2 / 2 / 2 |
| Timer/Counter | 4 x 16-bit |
| Package | 64-pin TQFP (PT) 10x10 mm, 0.5 mm pitch |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Lead-free, RoHS compliant per Microchip product family |
PIC32MX675F256H-80V/PT 64-pin tqfp (pt) 10x10 mm, 0.5 mm pitch Pin Configuration Guide
Pin configuration for PIC32MX675F256H-80V/PT (64-pin tqfp (pt) 10x10 mm, 0.5 mm pitch 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 PIC32MX675F256H-80V/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC32MX675F256H-80V/PT is suitable for 6 applications: Industrial Ethernet Gateway, USB-OTG Device or Host Controller, Building Automation Controller, Point-of-Sale Terminal, Remote Sensor Concentrator, Embedded Web Server / IoT Node.
Industrial Ethernet Gateway
The PIC32MX675F256H-80V/PT is a strong fit for industrial Ethernet gateways because it combines an integrated 10/100 Ethernet MAC supporting MII/RMII with 64 KB SRAM that comfortably hosts an lwIP or Harmony TCP/IP stack. At 80 MHz the M4K core delivers 105 DMIPS, enough to run Modbus TCP, EtherNet/IP, or MQTT client logic alongside HTTP and TLS handshake preparation. Paired with a LAN8720 RMII PHY and external magnetics, the part becomes a complete subnode bridging RS-485 Modbus RTU, USB, or CAN-feldbus slaves to the Ethernet backbone. The V-grade -40 C to +105 C junction range supports DIN-rail and outdoor cabinet installations.
Recommended
USB-OTG Device or Host Controller
With on-chip USB 2.0 On-The-Go PHY plus a dedicated DMA channel for OTG, the PIC32MX675F256H-80V/PT is well matched to embedded USB devices, hosts, and dual-role designs. The 256 KB Flash accommodates full USB stacks - CDC ACM, MSD, HID, and vendor classes - without external memory, while 64 KB SRAM holds enumeration buffers and class state. The M4K core at 105 DMIPS sustains USB full-speed 12 Mbps traffic with CPU headroom for application code. Designers save board space and BOM cost by eliminating external PHY chips and level shifters that competing 32-bit MCUs require.
Recommended
Building Automation Controller
The PIC32MX675F256H-80V/PT suits building automation nodes - BACnet gateways, KNX bridges, HVAC controllers - by delivering real-time IO core plus Dual connectivity in one MCU. For a BACnet/IP to BACnet MS-TP bridge the integrated Ethernet MAC handles the IP side, while UART peripherals drive MS-TP at 76.8 kbps. The 256 KB Flash plus 64 KB SRAM lets a single MCU run BACnet stack, scheduler, and application logic without external memory. The V temperature grade covers plenum enclosures in non-conditioned spaces, and the 64-pin TQFP footprint simplifies hand-solderable prototyping on standard 0.5 mm-pitch PCBs.
Recommended
Point-of-Sale Terminal
For compact POS terminals, the PIC32MX675F256H-80V/PT brings together USB-OTG for external peripherals (barcode scanners, printers), Ethernet for payment authorization, and 256 KB Flash for application code, plus 64 KB RAM for transaction buffers. The 80 MHz core provides fast cryptographic subroutines for token handling, while multiple UARTs drive receipt printers and PIN pads. Surface-mount TQFP-64 supports reflow profiles compatible with standard lead-free PCB assembly used in commercial POS hardware. Microchip's Harmony framework provides ready-made CDC and HID stacks to shorten firmware cycles.
Recommended
Remote Sensor Concentrator
As a remote sensor concentrator over Ethernet, the PIC32MX675F256H-80V/PT aggregates analog and digital sensor data from UART, I2C, and SPI field devices and publishes them via MQTT or HTTP. The 16-channel 10-bit ADC at 1 Msps handles direct sensor inputs for analog channels, while dedicated DMA offloads memory-to-memory transfers from the CPU. With 64 KB SRAM the part buffers bursty sensor traffic before forwarding, and the 10/100 Ethernet MAC pushes data to the cloud at sub-second intervals. The V temperature grade accommodates rooftop and pole-mount installations with full sun exposure.
Recommended
Embedded Web Server / IoT Node
The PIC32MX675F256H-80V/PT functions as a self-contained embedded web server for IoT nodes, running an HTTP server with RESTful endpoints on the integrated 10/100 Ethernet MAC. At 80 MHz the M4K core serves web pages with reasonable latency for dashboards and configuration portals, while 256 KB Flash holds HTML assets alongside application firmware. The 64 KB SRAM is sufficient for lwIP plus TLS record buffers when paired with a hardware crypto coprocessor. USB OTG enables local configuration and firmware updates over USB mass storage, eliminating the need for JTAG on production units.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX675F256H-80V/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX675F256H-80I/PT | PIC32MX675F256HT-80V/PT | PIC32MX675F256H-80V/MR | PIC32MX575F256H-80V/PT | PIC32MX795F512L-80V/PT |
|---|---|---|---|---|---|---|
| Package | 64-pin TQFP (PT) 10x10 mm | 64-pin TQFP (PT) - same | 64-pin TQFP (PT) - same | 64-pin QFN (MR) - differs | 64-pin TQFP (PT) - same | 64-pin TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 512 KB (+100%) |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB | 128 KB (+100%) |
| USB OTG with PHY | Yes (with PHY) | Yes (with PHY) | Yes (with PHY) | Yes (with PHY) | Yes (with PHY) | Yes (with PHY) |
| 10/100 Ethernet MAC | Yes | Yes | Yes | Yes | No | Yes |
| Operating Temperature | -40 C to +105 C (V) | -40 C to +85 C (I) | -40 C to +105 C (V) | -40 C to +105 C (V) | -40 C to +105 C (V) | -40 C to +105 C (V) |
Key Differentiators
- On-chip USB 2.0 OTG with integrated PHY (vs STM32F407VG)
- Industry-leading combination of Flash + RAM + Ethernet + USB OTG in 64-pin TQFP (vs PIC32MX575F256H-80V/PT)
- 256 KB Flash and 64 KB RAM in cost-effective industrial V grade (vs PIC32MX460F256L-80V/PT)
Design Notes
Estimated: at 80 MHz full operation the M4K core plus USB OTG + Ethernet MAC draws approximately 70-90 mA from the 3.3 V rail (typical, application-dependent). Provide a low-noise 3.3 V LDO with at least 200 mA rating and place 100 nF + 10 uF decoupling within 5 mm of each VDD/VSS pair. The MCU has multiple VDD pins (core and I/O); each requires its own local decoupling. A ferrite bead between analog AVDD and digital VDD reduces ADC noise coupling into sensitive measurements.
Route the 50 MHz Ethernet reference clock and RMII signals as a matched-length group with 50 ohm controlled impedance and keep them away from the USB DP/DM differential pair. The USB DP/DM pair requires 90 ohm differential impedance. Place the MCU's VCAP pin with a 10 uF + 100 nF pair; this internal regulator output is required for the 1.8 V core. JTAG/ICSP traces should be short (< 50 mm) and pulled to known states during reset to avoid inadvertent entry into debug mode.
Do not connect the VBUS pin of the USB OTG peripheral directly to VDD; USB OTG requires the on-chip PHY's internal voltage regulator and external sensing resistor network on VBUS. The Ethernet MAC requires an external PHY (such as LAN8720A); connecting the MAC directly to a magnetics or RJ-45 without a PHY will not function. The 80V temperature grade must be selected explicitly; substituting the I grade part in V-grade designs voids the temperature spec. Always confirm the JTAG TMS pin is not floating during reset or the part may enter debug mode unintentionally.
Estimated: at full 80 MHz operation with USB OTG active and Ethernet MAC in RMII mode, total power dissipation is approximately 250-300 mW. The TQFP-64 (PT) package has theta_JA around 50 C/W on a 4-layer 1 oz copper PCB, yielding a junction temperature rise of approximately 15 C above ambient at typical conditions. The V-grade -40 C to +105 C window provides adequate margin for industrial installations; ensure PCB copper area around the exposed pad maintains the rated thermal performance.
Compliance Information
Lead-free and RoHS compliant per Microchip PIC32MX family datasheet. AEC-Q100 qualification is not applicable - this is an industrial-grade MCU, not an automotive-qualified part. For automotive applications, consult Microchip's dsPIC33 or PIC32MK families.