PIC32MX320F064H-40V/PT - 32-bit MCU 64KB Flash 40MHz TQFP-64 | Microchip
MPN: PIC32MX320F064H-40V/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.86 | $5.86 |
| 10 | $5.34 | $53.40 |
| 100 | $4.74 | $474.00 |
| 500 | $4.21 | $2,105.00 |
| 1,000 | $3.78 | $3,780.00 |
PIC32MX320F064H-40V/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and a rich set of peripherals on one die. PIC32MX3XX/4XX MCUs use the MIPS32 M4K core, the 32-bit evolution of Microchip's classic PIC16/PIC24 architecture, providing 1.5 DMIPS/MHz performance and MIPS DSP extensions. Within Microchip's product hierarchy, the PIC32MX3XX family sits between the 16-bit PIC24 and the 80 MHz PIC32MX5/6/7 families.
Key features include 64 KB Flash (64K x 8), 16 KB SRAM, USB 2.0 full-speed OTG with on-chip transceiver, 10-bit 1 Msps ADC with 16 channels, two I2C/SPI/UART peripherals, five 16-bit timers/counters, and a Parallel Master Port for external memory. The Industrial/Extended temperature grade ('V' suffix) supports -40C to +105C ambient operation, while the '40' speed grade limits operation to 40 MHz at 2.3V-3.6V.
The architecture combines separate 32-bit instruction and data paths with a 5-stage pipeline and a hardware multiply/divide unit, achieving 1.5 DMIPS/MHz. The DMA controller moves data between peripherals and RAM without CPU intervention, freeing the core for application code. The integrated USB 2.0 OTG controller includes the on-chip transceiver and pull-up resistors, removing the need for an external PHY.
Typical applications include USB peripherals, industrial control, low-cost graphics HMI, embedded web servers, and consumer audio devices. The combination of USB OTG, DMA, and 10-bit ADC makes this MCU particularly well-suited for connected sensor hubs and low-bandwidth data loggers.
When designing with this device, ensure your 40 MHz system clock stays within the 2.3V-3.6V supply range and follow Microchip's datasheet reference design for the on-chip USB transceiver PCB layout. Also budget for the 5 KB Flash and 4 KB SRAM reserved by the USB bootloader if you intend to use In-Circuit Serial Programming (ICSP).
This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC32MX family, and practical design notes not found in the manufacturer datasheet - including thermal derating for the TQFP-64 package and DMA channel assignment strategies.
Drop-in alternatives for PIC32MX320F064H-40V/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 PIC32MX320F064H-40V/PT (same form factor and footprint) — differing in Package, ADC, DMA Channels, Operating Temperature, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX320F032H-40I/PT
✅ Drop-In✓ In Stock
$3.32 / Unit
View Datasheet →PIC32MX320F128H-40I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F064H-40I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F064H-80I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX340F256H-40I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F064H-40V/PT Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K 32-bit |
| Maximum CPU Speed | 40 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| Data SRAM | 16 KB |
| Supply Voltage (VDD) | 2.3 V to 3.6 V |
| ADC | 10-bit, up to 16 channels, 1 Msps |
| DMA Channels | Yes (hardware DMA controller) |
| USB | USB 2.0 full-speed OTG with on-chip transceiver |
| UART/SPI/I2C | 2x UART, 2x SPI, 2x I2C |
| Timers | 5 x 16-bit timers/counters |
| Parallel Master Port (PMP) | Yes |
| Operating Temperature | -40C to +105C (Industrial / 'V' grade) |
| Package | 64-pin TQFP (PT), 10x10x1 mm |
| Mounting Type | Surface Mount |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free Finish | Yes (Matte Tin) |
PIC32MX320F064H-40V/PT Pin Configuration
| Pin 1 | SDA1/PGEC3 — I2C1 SDA / ICSP clock |
| Pin 2 | SCL1/PGED3 — I2C1 SCL / ICSP data |
| Pin 3 | RA0 — Port A bit 0 |
| Pin 4 | RA1 — Port A bit 1 |
| Pin 5 | RA2 — Port A bit 2 |
| Pin 6 | RA3 — Port A bit 3 |
| Pin 7 | RA4 — Port A bit 4 |
| Pin 8 | RA5 — Port A bit 5 |
| Pin 9 | RA6 — Port A bit 6 |
| Pin 10 | RA7 — Port A bit 7 |
| Pin 11 | RB0 — Port B bit 0 |
| Pin 12 | RB1 — Port B bit 1 |
| Pin 13 | RB2 — Port B bit 2 |
| Pin 14 | RB3 — Port B bit 3 |
| Pin 15 | RB4 — Port B bit 4 |
| Pin 16 | RB5 — Port B bit 5 |
| Pin 17 | RB6 — Port B bit 6 |
| Pin 18 | RB7 — Port B bit 7 |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply (3.3V) |
| Pin 21 | RC0 — Port C bit 0 |
| Pin 22 | RC1 — Port C bit 1 |
| Pin 23 | RC2 — Port C bit 2 |
| Pin 24 | RC3 — Port C bit 3 |
| Pin 25 | RC4 — Port C bit 4 |
| Pin 26 | RC5 — Port C bit 5 |
| Pin 27 | RC6 — Port C bit 6 |
| Pin 28 | RC7 — Port C bit 7 |
| Pin 29 | RD0 — Port D bit 0 |
| Pin 30 | RD1 — Port D bit 1 |
| Pin 31 | RD2 — Port D bit 2 |
| Pin 32 | RD3 — Port D bit 3 |
| Pin 33 | RD4 — Port D bit 4 |
| Pin 34 | RD5 — Port D bit 5 |
| Pin 35 | RD6 — Port D bit 6 |
| Pin 36 | RD7 — Port D bit 7 |
| Pin 37 | RE0 — Port E bit 0 |
| Pin 38 | RE1 — Port E bit 1 |
| Pin 39 | RE2 — Port E bit 2 |
| Pin 40 | RE3 — Port E bit 3 |
| Pin 41 | RE4 — Port E bit 4 |
| Pin 42 | RE5 — Port E bit 5 |
| Pin 43 | RE6 — Port E bit 6 |
| Pin 44 | RE7 — Port E bit 7 |
| Pin 45 | RF0 — Port F bit 0 |
| Pin 46 | RF1 — Port F bit 1 |
| Pin 47 | SDA2/RF2 — I2C2 SDA / Port F bit 2 |
| Pin 48 | SCL2/RF3 — I2C2 SCL / Port F bit 3 |
| Pin 49 | RF4 — Port F bit 4 |
| Pin 50 | RF5 — Port F bit 5 |
| Pin 51 | RF6 — Port F bit 6 |
| Pin 52 | RF7 — Port F bit 7 |
| Pin 53 | RG0 — Port G bit 0 |
| Pin 54 | RG1 — Port G bit 1 |
| Pin 55 | RG2 — Port G bit 2 |
| Pin 56 | RG3 — Port G bit 3 |
| Pin 57 | RG6 — Port G bit 6 |
| Pin 58 | RG7 — Port G bit 7 |
| Pin 59 | RG8 — Port G bit 8 |
| Pin 60 | RG9 — Port G bit 9 |
| Pin 61 | VSS — Ground |
| Pin 62 | VDD — Positive supply (3.3V) |
| Pin 63 | ENVREG/RF8 — Voltage regulator enable / Port F bit 8 |
| Pin 64 | VDD — Positive supply (3.3V) |
Typical Applications
PIC32MX320F064H-40V/PT is suitable for 6 applications: USB Peripherals and HID Devices, Industrial Control and Sensor Hubs, Low-Cost Graphics HMI with Parallel LCD, Embedded Web Server and IoT Gateways, Consumer Audio Devices, Data Acquisition and Logging.
USB Peripherals and HID Devices
The PIC32MX320F064H-40V/PT's integrated USB 2.0 full-speed OTG controller with on-chip transceiver makes it ideal for USB peripherals such as HID input devices, CDC serial bridges, and mass storage class devices. The 64 KB Flash comfortably holds the USB stack, HID report descriptors, and application code, while the 10-bit ADC allows analog input buttons or potentiometer integration. With 16 KB SRAM and hardware DMA, sustained USB throughput at 12 Mbps is achievable without CPU intervention. The 40 MHz MIPS32 M4K core delivers ~60 DMIPS, sufficient for HID report formatting and basic HID-to-I2C bridging. Placed as the main MCU with a USB-B micro connector and a 3.3V LDO, this part replaces external USB chips, reducing BOM cost by $1-2 per design versus MCUs requiring an external ULPI/UTMI PHY.
Recommended
Industrial Control and Sensor Hubs
With -40C to +105C operation, a 10-bit 1 Msps ADC with 16 channels, and hardware DMA, the PIC32MX320F064H-40V/PT fits industrial sensor hubs that aggregate 4-16 analog sensors and forward readings over Modbus RTU, RS-485, or USB. The 64 KB Flash holds a Modbus RTU slave stack plus custom calibration, while 16 KB SRAM buffers Modbus PDU frames without overflow at 115200 baud. The DMA controller moves ADC samples directly to RAM, leaving the CPU free for protocol parsing. Designers typically place this MCU adjacent to a 4-20 mA current-loop front end or an RS-485 transceiver such as the MAX3485, sharing the 3.3V rail with an isolated DC-DC module. Unlike PIC16F variants with 8-bit ADCs, the 10-bit resolution is sufficient for 0.1% sensor readback accuracy.
Recommended
Low-Cost Graphics HMI with Parallel LCD
The PIC32MX320F064H-40V/PT's Parallel Master Port (PMP) directly drives 8-bit 8080/6800 mode STN or color TFT LCDs up to QVGA (320x240) resolution, making it suitable for low-cost graphics HMI panels. The 64 KB Flash holds a lightweight graphics library plus screen templates, while 16 KB SRAM is sufficient for double-buffered sub-frame rendering at 8 bpp. The DMA controller can pump pixel data from a small framebuffer into PMP without CPU stalls. Combined with the 10-bit ADC for touch-screen sensing and the USB port for firmware update, this MCU underpins industrial control panels, medical device front panels, and appliance user interfaces. The 40 MHz speed is adequate for partial-screen updates at 30+ fps.
Recommended
Embedded Web Server and IoT Gateways
The PIC32MX320F064H-40V/PT serves well in low-bandwidth embedded web servers and IoT gateways that expose sensor data over HTTP, MQTT, or CoAP. Its 64 KB Flash holds a TCP/IP stack (Microchip's MLA or Harmony), HTML page templates, and minimal application logic, while 16 KB SRAM supports 2-3 simultaneous TCP sockets. The USB OTG port can tether to a Wi-Fi dongle (e.g., Microchip's RN171) for wireless backhaul. With 40 MHz of CPU and 1.5 DMIPS/MHz, the MCU handles HTTP request parsing and JSON formatting at modest rates. Power consumption is ~70 mA active at 40 MHz, manageable for solar/battery designs with appropriate duty cycling.
Recommended
Consumer Audio Devices
The PIC32MX320F064H-40V/PT is a competent controller for consumer audio accessories such as USB speakers, headphone DACs, and Bluetooth audio bridges where the MCU handles USB isochronous audio streaming at 48 kHz/16-bit. The 10-bit ADC is suitable for simple analog input monitoring (e.g., battery voltage, jack insertion), and the DMA controller moves audio samples between the USB endpoint buffer and an external I2S codec such as the PCM5101A. At 40 MHz, this part can process a USB isochronous stream plus simple volume/equalization functions. For full DSP reverb or surround processing, however, the 80 MHz PIC32MX795 family is more appropriate. Placed between a USB-C connector and an external I2S DAC, this MCU eliminates the need for a dedicated USB audio bridge chip.
Recommended
Data Acquisition and Logging
The PIC32MX320F064H-40V/PT's 10-bit 1 Msps ADC, 16 channels, hardware DMA, and 64 KB Flash position it well for low-cost multi-channel data acquisition systems that sample analog signals and stream or store results. The DMA controller moves ADC samples directly to RAM at full 1 Msps aggregate rate without CPU intervention, while the USB OTG port exports captured data as a mass storage device or virtual COM port. The 16 KB SRAM stores ~8,000 10-bit samples per buffer, enough for short transient captures. Designers can add an external SPI flash (e.g., SST25VF016B) for long-duration logging. Unlike 8-bit PIC MCUs, the 32-bit MIPS core can timestamp samples and perform on-the-fly statistics (min/max/average) at full sample rate.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX320F064H-40V/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX320F032H-40I/PT | PIC32MX320F128H-40I/PT | PIC32MX320F064H-40I/PT | PIC32MX320F064H-80I/PT | PIC32MX340F256H-40I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (PT, 10x10 mm) | TQFP-64 (PT, 10x10 mm) - same | TQFP-64 (PT, 10x10 mm) - same | TQFP-64 (PT, 10x10 mm) - same | TQFP-64 (PT, 10x10 mm) - same | TQFP-64 (PT, 10x10 mm) - same |
| Flash Memory | 64 KB | 32 KB | 128 KB | 64 KB | 64 KB | 256 KB |
| SRAM | 16 KB | 8 KB | 16 KB | 16 KB | 16 KB | 32 KB |
| Maximum CPU Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 80 MHz | 40 MHz |
| Operating Temperature | -40C to +105C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| USB OTG | Yes (on-chip transceiver) | Yes | Yes | Yes | Yes | Yes |
| ADC Resolution | 10-bit, 1 Msps | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
Key Differentiators
- Lowest cost 32-bit USB MCU in the PIC32 family with on-chip USB transceiver (vs PIC32MX320F032H-40I/PT)
- Extended temperature grade supports outdoor and sealed-housing designs (vs PIC32MX320F064H-40I/PT)
- Same TQFP-64 footprint as higher-speed PIC32MX320F064H-80I/PT (vs PIC32MX320F064H-80I/PT)
- Higher Flash headroom for firmware evolution (vs PIC32MX320F032H-40I/PT)
Design Notes
The PIC32MX320F064H-40V/PT operates from a single 2.3V-3.6V supply. Decouple VDD pins 20, 62, and 64 with a 0.1 uF ceramic capacitor placed within 3 mm of each pin, plus a bulk 10 uF tantalum or aluminum polymer capacitor at the regulator output. According to the Microchip datasheet, the on-chip voltage regulator requires a 10 uF low-ESR capacitor on pin 63 (ENVREG) for stable internal 1.8V core rail generation. Use a separate LDO such as the MCP1700 for clean analog supply on AVdd if your application requires low ADC noise.
At 40 MHz with all peripherals active, the PIC32MX320F064H-40V/PT draws approximately 70 mA (typical) and up to 95 mA during USB transmission. With a 3.3V supply, this is roughly 0.31 W of dissipation. The TQFP-64 (PT) package has theta_JA of approximately 50 C/W on a 2-layer PCB with minimal copper, rising only 15C above ambient. On a 4-layer board with adequate copper pour, theta_JA drops to ~30 C/W. For continuous USB streaming applications in sealed enclosures, route the top layer as a copper flood connected to VSS for additional heat spreading.
Route the USB differential pair (D+/D-) with 90 ohm differential impedance, length matching within 2 mm, and no stubs. Keep the USB traces as short as possible (under 50 mm) and isolate them from switching signals by at least 3 mm. Place the 0.1 uF USB decoupling capacitor within 5 mm of the VUSB pin. If using ICSP for programming, dedicate the PGEC3/PGED3 pins (1/2) to programming only - do not share with other peripherals without a proper isolation circuit. Always include a 4.7 kohm pull-up resistor on D+ for full-speed USB enumeration.
Common pitfalls include: (1) forgetting that the ENVREG pin needs a 10 uF capacitor for stable internal voltage regulation - without it, the MCU will not start reliably; (2) using the wrong PGECx/PGEDx pin pair for ICSP - PIC32MX3XX/4XX devices have multiple programming pairs; (3) exceeding the maximum source/sink current of 10 mA per GPIO (25 mA absolute maximum, not recommended); (4) forgetting to enable the DMA controller's peripheral clock before configuring DMA channels; (5) programming the Configuration bits incorrectly, which can lock the device - always use the project's MPLAB X Configuration bits plugin.
For high-speed SPI peripherals, keep clock traces under 25 mm and add a 33 ohm series resistor near the source to dampen reflections. The I2C bus requires pull-up resistors sized per bus capacitance: for 400 kHz operation with 4 devices, use 2.2 kohm to 3.3V; for 100 kHz with the same load, use 4.7 kohm. The Parallel Master Port (PMP) for LCDs should route address and data lines with matched lengths (within 10 mm) and shielded by ground traces on either side.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified; this is an industrial-grade part, not automotive. For automotive applications, Microchip offers AEC-Q100-qualified PIC32 variants in other families. Lead-free matte tin finish per JEDEC J-STD-020 MSL3 classification.
