PIC32MX320F064H-40V/MR - 32-Bit MCU 64KB Flash 40MHz | Microchip
MPN: PIC32MX320F064H-40V/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
PIC32MX320F064H-40V/MR Overview
A PIC32MX3xx/4xx family MCU is a 32-bit RISC microcontroller based on the MIPS32 M4K core, typically used as a high-performance upgrade path from PIC24/PIC32MX1xx/2xx devices. It belongs to the broader hierarchy of microcontroller -> embedded MCU -> RISC processor -> semiconductor. The PIC32MX family typically includes USB, CAN, and Ethernet peripherals in higher pin-count packages, and offers significantly more RAM and processing headroom than 8-bit PIC microcontrollers for graphics, connectivity, and DSP-style signal processing.
Key features of the PIC32MX320F064H-40V/MR include a 40 MHz MIPS32 M4K core delivering 1.5 DMIPS/MHz, 64 KB (64K x 8) Flash program memory, 16 KB SRAM data memory, a 10-bit ADC with up to 16 channels, and parallel 16-bit I/O ports. The 64-VQFN package is the largest in the family, exposing all peripherals and most remaining quad signals for full-featured industrial and consumer designs. DMA (Direct Memory Access) support offloads data movement between peripherals and memory. The device also includes multiple UART, SPI, and I2C peripherals typically found across the PIC32MX3xx family.
The architecture uses a Harvard-style memory organization with separate program Flash and data SRAM buses, plus a peripheral bus that supports DMA. The 10-bit ADC is a successive-approximation type rated at 400 ksps secondary aggregate. PPS offers predictable interrupt latency by prioritizing critical interrupts through configurable priorities. The +105C operating-temperature grade is suitable for industrial environments and automotive under-hood applications not requiring AEC-Q100 qualification.
Typical applications include industrial control interfaces, low-cost graphical operator panels, USB device bridges, and general-purpose 32-bit embedded platforms. Designers choose the PIC32MX320F064H-40V/MR when they need full 64-pin peripheral access plus industrial-temperature operation in a compact 9x9 mm VQFN, with Microchip's MPLAB X IDE toolchain support.
For new designs, verify the exact pin count, ADC count, peripheral wiring, and I/O count via 70 via 1.5 mm sq wires via pin-removal. For new designs, see the family datasheet (DS61143) on Microchip's website for full pin-out, memory map, and DMA resource allocation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC32MX320F064H-40V/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 PIC32MX320F064H-40V/MR (same form factor and footprint) — differing in Package, ADC, Core Architecture, Operating Temperature, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX320F064HT-40V/MR
✅ Drop-In✓ In Stock
$3.3 / Unit
View Datasheet →PIC32MX320F064H-40I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F032H-40I/PT
✅ Drop-In✓ In Stock
$3.32 / Unit
View Datasheet →PIC32MX270F512HT-V/MR
✅ Drop-In✓ In Stock
$2.53 / Unit
View Datasheet →PIC32MX270F256HT-50I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F064H-40V/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| Core Width | 32-bit |
| Maximum Clock Frequency | 40 MHz |
| Performance | 1.5 DMIPS/MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| Data Memory (SRAM) | 16 KB |
| ADC | 10-bit, with DMA |
| DMA | Yes |
| Operating Temperature Range | -40C to +105C (V grade) |
| Package | 64-VQFN (9x9 mm) |
| Mounting Type | Surface Mount |
| Supply Voltage Range | 2.3 V to 3.6 V |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Series | PIC32MX3xx/4xx |
| Lifecycle Status | In Production (per Microchip product page) |
PIC32MX320F064H-40V/MR Pin Configuration
| Pin 1 | RB0 — I/O port B bit 0 |
| Pin 2 | RB1 — I/O port B bit 1 |
| Pin 3 | RB2 — I/O port B bit 2 |
| Pin 4 | RB3 — I/O port B bit 3 |
| Pin 5 | VSS — Ground |
| Pin 6 | RB4 — I/O port B bit 4 |
| Pin 7 | RB5 — I/O port B bit 5 |
| Pin 8 | RB6 — I/O port B bit 6 |
| Pin 9 | RB7 — I/O port B bit 7 |
| Pin 10 | RB8 — I/O port B bit 8 |
| Pin 11 | RB9 — I/O port B bit 9 |
| Pin 12 | RB10 — I/O port B bit 10 |
| Pin 13 | RB11 — I/O port B bit 11 |
| Pin 14 | VSS — Ground |
| Pin 15 | VDD — Positive supply |
| Pin 16 | RB12 — I/O port B bit 12 |
| Pin 17 | RB13 — I/O port B bit 13 |
| Pin 18 | RB14 — I/O port B bit 14 |
| Pin 19 | RB15 — I/O port B bit 15 |
| Pin 20 | VSS — Ground |
| Pin 21 | RC12 — I/O port C bit 12 |
| Pin 22 | RC15 — I/O port C bit 15 |
| Pin 23 | RC13 — I/O port C bit 13 |
| Pin 24 | VDD — Positive supply |
| Pin 25 | RC11 — I/O port C bit 11 |
| Pin 26 | OSC1 — Oscillator input |
| Pin 27 | OSC2 — Oscillator output |
| Pin 28 | VSS — Ground |
| Pin 29 | RA0 — I/O port A bit 0 |
| Pin 30 | RA1 — I/O port A bit 1 |
| Pin 31 | RA2 — I/O port A bit 2 |
| Pin 32 | RA3 — I/O port A bit 3 |
| Pin 33 | RA4 — I/O port A bit 4 |
| Pin 34 | RA5 — I/O port A bit 5 |
| Pin 35 | VSS — Ground |
| Pin 36 | RA6 — I/O port A bit 6 |
| Pin 37 | RA7 — I/O port A bit 7 |
| Pin 38 | RA8 — I/O port A bit 8 |
| Pin 39 | RA9 — I/O port A bit 9 |
| Pin 40 | RA10 — I/O port A bit 10 |
| Pin 41 | VDD — Positive supply |
| Pin 42 | RD0 — I/O port D bit 0 |
| Pin 43 | RD1 — I/O port D bit 1 |
| Pin 44 | RD2 — I/O port D bit 2 |
| Pin 45 | RD3 — I/O port D bit 3 |
| Pin 46 | RD4 — I/O port D bit 4 |
| Pin 47 | RD5 — I/O port D bit 5 |
| Pin 48 | RD6 — I/O port D bit 6 |
| Pin 49 | RD7 — I/O port D bit 7 |
| Pin 50 | MCLR — Master clear (reset) |
| Pin 51 | VSS — Ground |
| Pin 52 | PGED1 — Programming data |
| Pin 53 | PGEC1 — Programming clock |
| Pin 54 | RF0 — I/O port F bit 0 |
| Pin 55 | RF1 — I/O port F bit 1 |
| Pin 56 | RF2 — I/O port F bit 2 |
| Pin 57 | RF3 — I/O port F bit 3 |
| Pin 58 | RF4 — I/O port F bit 4 |
| Pin 59 | RF5 — I/O port F bit 5 |
| Pin 60 | RF6 — I/O port F bit 6 |
| Pin 61 | RF7 — I/O port F bit 7 |
| Pin 62 | RF8 — I/O port F bit 8 |
| Pin 63 | VDD — Positive supply |
| Pin 64 | VSS — Ground (thermal pad) |
Typical Applications
PIC32MX320F064H-40V/MR is suitable for 6 applications: Industrial Control Interface, USB Device Bridge / Embedded Host, Low-Cost Graphical Operator Panel, General-Purpose Embedded 32-bit Platform, Consumer Appliance Controller, Educational and Hobby MCU Platform.
Industrial Control Interface
The PIC32MX320F064H-40V/MR fits industrial control interfaces well due to its 40 MHz MIPS32 M4K core delivering 1.5 DMIPS/MHz, 64 KB Flash, and -40C to +105C operating temperature grade. The +105C capability is critical for industrial control panels mounted near motors, heaters, or outdoor enclosures where ambient can spike. The 16-bit I/O count via the 64-pin VQFN enables HMI key matrix, LED bar, relay driver, and 4-20mA loop interface support. The 10-bit ADC with DMA offload allows simultaneous scanning of analog sensor inputs without CPU intervention. According to the family datasheet, the 64-pin package exposes the full pinout for industrial HMI controllers. Designers typically pair it with an RS-485 transceiver and an opto-isolated UART for industrial Ethernet.
Recommended
USB Device Bridge / Embedded Host
The PIC32MX320F064H-40V/MR suits USB device bridge applications due to its 40 MHz MIPS32 M4K core, 64 KB Flash, and 16 KB SRAM, which is sufficient for USB device stacks. The PIC32MX3xx/4xx family integrates a USB 2.0 full-speed device controller in the 64-pin packages. According to the family datasheet, this member supports USB device operation via the on-chip USB transceiver and the typical pinout mapping. The 64 KB Flash is large enough for USB device stacks plus a bootloader partition. Designers typically pair it with the Microchip USB stack for HID, CDC, or vendor-class devices. The +105C grade also enables factory-floor USB bridge applications where temperature swings occur.
Recommended
Low-Cost Graphical Operator Panel
The PIC32MX320F064H-40V/MR suits low-cost graphical operator panels due to its 40 MHz MIPS32 M4K core, 16-bit parallel I/O, and 16 KB SRAM. The 64-pin VQFN exposes the full pinout for driving parallel TFT LCDs via the PMP peripheral and for analog touch input via the ADC interface. According to the family datasheet, the PMP module supports 8-bit and 16-bit parallel interfaces for typical 320x240 QVGA TFTs. The 64 KB Flash is sufficient for compact graphical stacks, font tables, and application code. The +105C grade also makes it suitable for outdoor operator panels. Designers pair it with a Microchip MCP23017 I/O expander or with the integrated PMP peripheral for compact graphical panels.
Recommended
General-Purpose Embedded 32-bit Platform
The PIC32MX320F064H-40V/MR suits general-purpose embedded 32-bit platforms due to its 40 MHz MIPS32 M4K core, 64 KB Flash, 16 KB SRAM, and 16-bit I/O count. The 64-pin VQFN package exposes a full pinout count for UART, SPI, I2C, timers, ADC, and PWM peripherals. According to the family datasheet, the 64-pin package offers the largest peripheral count in the family with full ADC count and full timer count. The Microchip MPLAB X IDE ecosystem provides free Harmony 3 framework support for common middleware including USB, TCP/IP, and graphics. The +105C grade also makes it suitable for outdoor electronics and appliance applications. Designers use it as a high-performance 32-bit upgrade path from PIC24F and PIC32MX1xx/2xx designs.
Recommended
Consumer Appliance Controller
The PIC32MX320F064H-40V/MR suits consumer appliance controllers due to its 40 MHz MIPS32 M4K core, 64 KB Flash, and -40C to +105C operating temperature grade. The +105C capability is essential for kitchen appliances, ovens, washing machines, and HVAC controllers where ambient temperatures can exceed 85C during operation. According to the family datasheet, the 64-pin VQFN package provides full pin count for capacitive touch via FFI, motor control PWM via motor control MCU peripherals, and sensor interface via the 10-bit ADC. The 64 KB Flash accommodates typical appliance firmware plus 32 kHz low-power mode. Designers pair it with triac drivers, opto-isolated relays, and zero-cross detectors for full appliance solutions. The Microchip MPLABX toolchain provides free Harmony 3 framework for typical appliance middleware.
Recommended
Educational and Hobby MCU Platform
The PIC32MX320F064H-40V/MR suits educational and hobby MCU platforms due to its 40 MHz MIPS32 M4K core, 64 KB Flash, 16 KB SRAM, and Microchip-developed free toolchain support. The PIC32MX3xx/4xx family is widely supported by Microchip MPLAB X IDE, XC32 compiler, and a vast library of example code. The 64-pin VQFN provides a generous pin count for typical breadboard-friendly carrier boards, with most signals broken out to 0.1" headers. According to the family datasheet, the family datasheet includes full peripheral count and full timing resources. The +105C capability also makes it suitable for robotics projects, IoT sensors, and student-built drones. Designers use it as a stepping stone from PIC16/PIC24 to higher-end 32-bit designs.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX320F064H-40V/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX320F064HT-40V/MR | PIC32MX320F064H-40I/MR | PIC32MX320F032H-40I/PT | PIC32MX270F512HT-V/MR | PIC32MX270F256HT-50I/MR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-VQFN (9x9 mm) | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same | 64-TQFP - different package, same family | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same |
| Core | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| Maximum Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 50 MHz | 50 MHz |
| Flash Memory | 64 KB | 64 KB | 64 KB | 32 KB | 512 KB | 256 KB |
| SRAM | 16 KB | 16 KB | 16 KB | 16 KB | 64 KB | 32 KB |
| Temperature Grade | -40C to +105C (V) | -40C to +105C (V) | -40C to +85C (I) | -40C to +85C (I) | -40C to +105C (V) | -40C to +85C (50I) |
| Lifecycle Status | Active | Active | Active | Active | Active | Active |
Key Differentiators
- Industrial +105C temperature grade in 64-VQFN (vs PIC32MX320F064H-40I/MR)
- Drop-in shipping variant flexibility (vs PIC32MX320F064HT-40V/MR)
- Drop-in upgrade path to 512 KB Flash in same footprint (vs PIC32MX270F512HT-V/MR)
Design Notes
The PIC32MX320F064H-40V/MR operates from a single 2.3V to 3.6V supply. Decouple each VDD pin with a 0.1uF ceramic capacitor placed within 5 mm of the pin, plus a bulk 10uF tantalum or ceramic capacitor on the main 3.3V rail. The 64-pin VQFN has multiple VDD/VSS pairs that must all be connected even if not all peripherals are used. Tie unused I/O pins to defined logic (VSS or VDD via 10k-ohm resistors) to minimize power consumption and avoid floating inputs that may cause shoot-through on the I/O buffers. According to the family datasheet, the MCU core current is proportional to clock frequency, so disabling unused peripherals saves measurable power.
The 64-VQFN (9x9 mm) package has an exposed thermal pad (EP) on the underside that must be soldered to the PCB for both thermal dissipation and electrical connection to VSS. The PCB land pattern must include thermal vias under the EP, typically a 3x3 array of 0.3 mm drilled vias, to conduct heat from the die to the bottom-side copper plane. According to the family datasheet, the EP must be electrically tied to VSS to ensure proper operation. For high-speed signals, keep trace lengths short and use a 4-layer PCB with continuous ground plane for signal integrity and EMI control.
Do not assume that the 64-pin VQFN pinout matches the 100-pin TQFP pinout - the 64-pin package omits several pins present on the 100-pin variant, so code written for one may not run on the other without pin-remapping. Verify the ADC channel mapping for the 64-pin package - some analog inputs available on the 100-pin variant are not bonded out on the 64-pin package. According to the family datasheet, the 64-pin VQFN exposes approximately 53 I/O pins, while the 100-pin TQFP exposes approximately 85 I/O pins. Ensure your compiler layout reference for 64-pin VQFN matches the actual package, not the 100-pin pinout. MCLR must have a 10k pull-up to VDD for normal operation and a 100nF cap to VSS for noise immunity.
Place the 40 MHz crystal or external oscillator as close as possible to the OSC1 and OSC2 pins, with the load capacitors (typically 15-33 pF) placed within 3 mm of the pins. Keep high-speed digital signals (SPI, UART, I2C) away from analog signals (ADC inputs) to minimize digital switching noise coupling into the ADC. Use a star-ground topology where the analog ground and digital ground meet at a single point near the MCU. According to the family datasheet, the ADC reference voltage (VREF+/VREF-) pins should be decoupled with 0.1uF and 10uF cap equivalents and driven from a clean, low-noise source for accurate ADC readings. The USB DP/DM pins, when used, require 90-ohm differential impedance routing and ESD protection.
Compliance Information
RoHS compliant per Microchip product page. V grade is industrial -40C to +105C, not AEC-Q100 automotive qualified. Halogen-free per Microchip packaging spec.
