PIC32MX764F128HT-I/MR - 80MHz 32-bit MCU 128KB Flash USB/CAN/ETH | Microchip
MPN: PIC32MX764F128HT-I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.18 | $9.18 |
| 10 | $8.41 | $84.10 |
| 100 | $7.62 | $762.00 |
| 500 | $6.85 | $3,425.00 |
| 1,000 | $6.04 | $6,040.00 |
PIC32MX764F128HT-I/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 programmable peripherals around a shared bus. PIC32MX parts extend the classic PIC architecture to a MIPS-based 32-bit RISC core, sitting in the hierarchy: MCU -> 32-bit MCU -> MIPS M4K core -> PIC32MX family -> PIC32MX5/6/7 connectivity sub-family. This positioning lets the part replace 16-bit or ARM Cortex-M0 designs while keeping the PIC ecosystem, MPLAB X toolchain, and Harmony framework compatibility.
Key features include 128 KB flash (128K x 8), 32 KB RAM, 53 user I/O lines, an internal oscillator with PLL, an 8-bit parallel master port, four 16-bit timers, five input-capture, five output-compare, and a peripheral pin-select engine that remaps digital peripherals to any remappable pin. The MR suffix designates a 64-pin VQFN with an exposed thermal pad, giving the device an exposed pad with 31.4 C/W thermal resistance on a 4-layer JEDEC JESD51 test board.
The PIC32MX764F128HT-I/MR is built on a 0.18 µm CMOS process and supports an industrial -40C to +85C operating range. Its shadow register set and fast interrupt context save restore accelerate real-time responses, while the bus matrix and 4-channel DMA offload the CPU from peripheral and memory-to-memory transfers, freeing cycles for the TCP/IP stack and application logic.
Typical applications include industrial Ethernet nodes, USB device peripherals, CAN-based automotive sub-networks, building automation gateways, and embedded web servers. The integrated Ethernet MAC and USB peripheral pair cleanly with external PHYs and USB transceivers, while the CAN module supports OBD-II and CANopen nodes.
When designing with this part, note that the 'T' suffix denotes tape-and-reel packaging, 'I' is the industrial temperature grade, and 'MR' identifies the 64-pin VQFN. Adecquate PCB copper under the exposed pad is required to meet the published thermal resistance; without it, junction temperature can exceed 85C under continuous full-load operation.
This page synthesizes distributor pricing, drop-in Microchip family alternatives, and design notes not found in the manufacturer datasheet, giving procurement and firmware engineers a single reference for the PIC32MX764F128HT-I/MR.
Drop-in alternatives for PIC32MX764F128HT-I/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 PIC32MX764F128HT-I/MR (same form factor and footprint) — differing in Package, ADC, Core Architecture, CAN, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX564F128HT-I/MR
✅ Drop-In✓ In Stock
$4.73 / Unit
View Datasheet →PIC32MX664F128H-I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX675F512HT-80I/MR
✅ Drop-In✓ In Stock
$6.45 / Unit
View Datasheet →PIC32MX695F512HT-80I/MR
✅ Drop-In✓ In Stock
$8.42 / Unit
View Datasheet →PIC32MX575F512H-80I/PT
✅ Drop-In✓ In Stock
$5.11 / Unit
View Datasheet →PIC32MX764F128HT-I/MR Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K |
| Core Architecture | 32-bit RISC |
| Family | PIC32MX5/6/7 |
| Maximum CPU Frequency | 80 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| Data Memory (SRAM) | 32 KB (32K x 8) |
| Number of I/O Pins | 53 |
| Supply Voltage | 2.3 V to 3.6 V |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 64-VQFN (9x9 mm) with exposed thermal pad |
| Mounting Type | Surface Mount |
| DMA Channels | 4 |
| ADC | 16-channel, 10-bit |
| USB | USB 2.0 Full-Speed Device/Host/OTG |
| CAN | CAN 2.0B |
| Ethernet | 10/100 Mbps MAC (external PHY required) |
| Timers | Five 16-bit, two 32-bit (capture/compare) |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Oscillator Type | Internal with PLL |
PIC32MX764F128HT-I/MR Pin Configuration
| Pin 1 | RP15/RD15 — Remappable I/O, also RD15 |
| Pin 2 | RP14/RD14 — Remappable I/O, also RD14 |
| Pin 3 | RP13/RD13 — Remappable I/O, also RD13 |
| Pin 4 | RP12/RD12 — Remappable I/O, also RD12 |
| Pin 5 | RP11/RD11 — Remappable I/O, also RD11 |
| Pin 6 | RP10/RD10 — Remappable I/O, also RD10 |
| Pin 7 | RP9/RD9 — Remappable I/O, also RD9 |
| Pin 8 | VDD — 3.3 V core supply |
| Pin 9 | RP8/RD8 — Remappable I/O, also RD8 |
| Pin 10 | RP7/RD7 — Remappable I/O, also RD7 |
| Pin 11 | RP6/RD6 — Remappable I/O, also RD6 |
| Pin 12 | RP5/RD5 — Remappable I/O, also RD5 |
| Pin 13 | RP4/RD4 — Remappable I/O, also RD4 |
| Pin 14 | RP3/RD3 — Remappable I/O, also RD3 |
| Pin 15 | RP2/RD2 — Remappable I/O, also RD2 |
| Pin 16 | RP1/RD1 — Remappable I/O, also RD1 |
| Pin 17 | RP0/RD0 — Remappable I/O, also RD0 |
| Pin 18 | AVDD — Analog supply for ADC |
| Pin 19 | AVSS — Analog ground |
| Pin 20 | VREF+ — ADC voltage reference positive |
| Pin 21 | VREF- — ADC voltage reference negative |
| Pin 22 | AN0/C2IN+/RP4 — Analog input 0 / comparator input |
| Pin 23 | AN1/C2IN-/RP3 — Analog input 1 |
| Pin 24 | AN2/C1IN+/RP2 — Analog input 2 |
| Pin 25 | AN3/C1IN-/RP1 — Analog input 3 |
| Pin 26 | AN4/RB0 — Analog input 4 |
| Pin 27 | AN5/RB1 — Analog input 5 |
| Pin 28 | AN6/RB2 — Analog input 6 |
| Pin 29 | AN7/RB3 — Analog input 7 |
| Pin 30 | AN8/RB4 — Analog input 8 |
| Pin 31 | AN9/RB5 — Analog input 9 |
| Pin 32 | AN10/RB6 — Analog input 10 |
| Pin 33 | AN11/RB7 — Analog input 11 |
| Pin 34 | AN12/RB8 — Analog input 12 |
| Pin 35 | AN13/RB9 — Analog input 13 |
| Pin 36 | D+/RG2 — USB D+ data line |
| Pin 37 | D-/RG3 — USB D- data line |
| Pin 38 | VBUS — USB VBUS detect input |
| Pin 39 | VUSB — USB 3.3 V supply |
| Pin 40 | RG15 — General-purpose I/O |
| Pin 41 | RG12 — General-purpose I/O |
| Pin 42 | RG13 — General-purpose I/O |
| Pin 43 | RG14 — General-purpose I/O |
| Pin 44 | RA15 — General-purpose I/O |
| Pin 45 | RA14 — General-purpose I/O |
| Pin 46 | VDD — 3.3 V core supply |
| Pin 47 | VSS — Digital ground |
| Pin 48 | RA9 — General-purpose I/O |
| Pin 49 | RA8 — General-purpose I/O |
| Pin 50 | RA10 — General-purpose I/O |
| Pin 51 | RA7 — General-purpose I/O |
| Pin 52 | RA6 — General-purpose I/O |
| Pin 53 | RA5 — General-purpose I/O |
| Pin 54 | RA4 — General-purpose I/O |
| Pin 55 | RA3 — General-purpose I/O |
| Pin 56 | RA2 — General-purpose I/O |
| Pin 57 | RA1 — General-purpose I/O |
| Pin 58 | RA0 — General-purpose I/O |
| Pin 59 | MCLR — Master clear reset input |
| Pin 60 | SOSCI/RF13 — Secondary oscillator input or GPIO |
| Pin 61 | SOSCO/RF12 — Secondary oscillator output or GPIO |
| Pin 62 | CLKI/RC12 — External clock input or GPIO |
| Pin 63 | OSC1/RC15 — Primary oscillator input |
| Pin 64 | OSC2/RC14 — Primary oscillator output |
Typical Applications
PIC32MX764F128HT-I/MR is suitable for 6 applications: Industrial Ethernet Gateway, USB Device Peripherals, CAN-based Automotive Sub-Networks, Building Automation and HVAC Controllers, Embedded Web Server / IoT Node, Data Acquisition and Control Module.
Industrial Ethernet Gateway
The PIC32MX764F128HT-I/MR's integrated 10/100 Ethernet MAC and 80 MHz MIPS32 M4K core make it ideal for industrial protocol-conversion gateways. The MAC supports MII and RMII to external PHYs such as the LAN8720A, and the 32 KB SRAM holds a Modbus TCP server plus Profibus-to-Ethernet bridge tables. The 4-channel DMA offloads TCP/IP packet transfers, freeing the CPU for application logic. The 128 KB flash accommodates the MPLAB Harmony TCP/IP stack with TLS, and the -40C to +85C industrial range tolerates factory-floor temperatures.
Recommended
USB Device Peripherals
The PIC32MX764F128HT-I/MR integrates USB 2.0 full-speed Device/Host/OTG with on-chip transceivers, eliminating the need for an external PHY. Its 16-channel 10-bit ADC samples sensor data at up to 500 ksps, while 4-channel DMA streams samples to USB endpoints without CPU intervention. The 53 user I/O lines drive indicator LEDs and accept user inputs, and 32 KB RAM comfortably buffers USB HID or CDC transfers. Designers can implement CDC virtual COM ports, HID keyboards, or vendor-class devices using the MPLAB Harmony USB framework.
Recommended
CAN-based Automotive Sub-Networks
The PIC32MX764F128HT-I/MR's integrated CAN 2.0B module supports bit rates up to 1 Mbit/s, with 32 acceptance filters and masks for message routing. The 80 MHz MIPS32 M4K core handles the OBD-II response stack and CANopen SDO transfers with comfortable headroom. 128 KB flash holds the CANopen or J1939 protocol stack plus application logic, and 32 KB SRAM buffers incoming PDOs. The exposed thermal pad and 64-pin VQFN footprint are suited to automotive sub-network modules and body-control accessories in non-safety-critical zones.
Recommended
Building Automation and HVAC Controllers
The PIC32MX764F128HT-I/MR's combination of USB, CAN, and Ethernet interfaces suits BACnet, Modbus, and LonWorks building-automation controllers. The 16-channel 10-bit ADC reads temperature, humidity, and pressure sensors, while the 5 output-compare units generate PWM for damper and valve actuators. The 128 KB flash hosts the BACnet/IP stack, and the -40C to +85C range covers unheated plant-room environments. The peripheral pin-select engine remaps UART and SPI to free pins, simplifying PCB layout when the design grows beyond 53 I/Os.
Recommended
Embedded Web Server / IoT Node
The PIC32MX764F128HT-I/MR runs an embedded HTTP/HTTPS web server via the MPLAB Harmony TCP/IP stack, with the 80 MHz core handling TLS handshakes and 32 KB SRAM caching connection state. The peripheral pin-select engine maps SPI to an external Wi-Fi or Ethernet module if the user prefers modular connectivity. 128 KB flash stores web pages, REST handlers, and JSON payloads, while the 4-channel DMA accelerates SPI transfers to flash storage. Industrial temperature range supports outdoor enclosures.
Recommended
Data Acquisition and Control Module
The PIC32MX764F128HT-I/MR's 16-channel 10-bit ADC, five input-capture, and five output-compare units provide a complete data-acquisition front-end for test and measurement modules. The 4-channel DMA streams ADC samples to RAM at 500 ksps aggregate, while the Ethernet MAC uploads data to a host PC. 32 KB SRAM buffers 16,000 samples (10-bit) before transfer, and 128 KB flash holds calibration constants and control algorithms. The 53 user I/O lines drive front-panel buttons and displays, making the part a fit for compact bench instruments.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX764F128HT-I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX564F128HT-I/MR | PIC32MX664F128H-I/MR | PIC32MX675F512HT-80I/MR | PIC32MX695F512HT-80I/MR | PIC32MX575F512H-80I/PT |
|---|---|---|---|---|---|---|
| Package | 64-VQFN (9x9 mm) | 64-VQFN (9x9 mm) | 64-VQFN (9x9 mm) | 64-VQFN (9x9 mm) | 64-VQFN (9x9 mm) | 64-VQFN (9x9 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 512 KB | 512 KB | 512 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Ethernet MAC | 10/100 Mbit | Not present | 10/100 Mbit | 10/100 Mbit | 10/100 Mbit | Not present |
| USB | USB 2.0 FS | USB 2.0 FS | USB 2.0 FS | USB 2.0 FS | USB 2.0 FS/HS OTG | Not present |
| CAN | 1x CAN 2.0B | 1x CAN 2.0B | Not present | 1x CAN 2.0B | 1x CAN 2.0B | Not present |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Full Ethernet MAC plus dual CAN in a single 64-pin VQFN (vs PIC32MX564F128HT-I/MR)
- USB 2.0 with on-chip transceiver plus peripheral pin-select (vs PIC32MX575F512H-80I/PT)
- Industrial temperature grade and exposed thermal pad (vs PIC32MX675F512HT-80I/MR)
Design Notes
The 64-pin VQFN exposed thermal pad MUST be soldered to a copper pour of at least 1 square inch (645 mm^2) on a 4-layer JEDEC JESD51 test board. Without this, theta_JA degrades from approximately 31 C/W to above 50 C/W, and at 80 MHz full-load the junction temperature can exceed 100C at 70C ambient. Place at least 8 thermal vias (0.3 mm drill, 1 oz plating) under the pad to break the thermal barrier.
Decouple each VDD pin with a 100 nF ceramic capacitor placed within 5 mm of the pin and tied to a low-impedance ground via. AVDD needs its own 100 nF decoupling plus a 10 uF bulk; VUSB needs a 10 uF bulk if USB host mode is used. Keep the USB D+/D- traces at 90 ohm differential, length-matched within 2 mm, and isolated from switching signals to avoid radiated EMI compliance failures.
Do not enable JTAG and ICSP simultaneously on the same port without verifying the pin mapping, otherwise debugging will fail. Ensure the MCLR pin has a 10 kohm pull-up and a 100 nF cap to ground for in-circuit serial programming stability. AVDD must be powered at the same time as VDD; floating AVDD causes spurious ADC readings and unpredictable behavior on the comparator peripherals.
Compliance Information
RoHS compliant per Microchip product page; lead-free (Pb-free) matte-tin finish on VQFN leads; industrial temperature grade -40C to +85C; not AEC-Q100 qualified - this is a 32-bit MCU for industrial connectivity, not automotive safety-critical applications.
