PIC32MX320F128H-80I/MR - 80MHz 32-bit MCU 128KB Flash | Microchip
MPN: PIC32MX320F128H-80I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.63 | $5.63 |
| 10 | $5.18 | $51.80 |
| 100 | $4.69 | $469.00 |
| 500 | $4.21 | $2,105.00 |
| 1,000 | $3.85 | $3,850.00 |
PIC32MX320F128H-80I/MR Overview
What is a 32-bit PIC microcontroller? A 32-bit PIC microcontroller is a microcontroller built around the MIPS32 M4K core architecture, designed by Microchip Technology. Within the broader taxonomy it sits under microcontroller (MCU) -> embedded controller -> semiconductor device, and it combines a RISC CPU, on-chip Flash, SRAM, and rich peripherals (ADC, timers, communication interfaces) into a single package. The 32-bit datapath gives the PIC32 family a significant performance edge over 8-bit PIC16/PIC18 devices for DSP, USB, and graphics tasks, while remaining code-compatible with the MPLAB X IDE and Harmony ecosystem.
Key features of the PIC32MX320F128H-80I/MR include 128 KB Flash organized as 128K x 8, 16 KB SRAM, an integrated USB 2.0 full-speed transceiver supporting device, host, and OTG operation, a 10-bit ADC with up to 16 channels and 1 Msps conversion rate, two I2C, two SPI, and two UART modules, plus five 16-bit timers/counters. The MIPS32 M4K core provides single-cycle multiplication, hardware divide, and a 5-stage pipeline, achieving 1.56 DMIPS/MHz and 80 MHz / 1.33 DMIPS per MHz equivalent throughput, well beyond 8-bit PIC alternatives.
In terms of architecture and process, the PIC32MX3xx family uses a 0.18 µm flash process with on-chip voltage regulation to 1.8 V core from a 2.5-3.6 V supply. Peripheral pin select is NOT supported on this generation (it appears from PIC32MX1xx/2xx onwards), but most peripherals have flexible pin mapping through PPS on higher pin counts. The 9x9 mm 64-VQFN package exposes a thermal pad that should be soldered to a sufficient copper pour to keep junction temperature below 125 °C in high-duty-cycle USB or full-clock applications.
Typical applications include USB peripherals (HID, CDC, mass storage, audio class), industrial control with USB diagnostics, low-cost graphics HMI with external LCD controller, sensor hubs, and general-purpose 32-bit embedded control in commercial and industrial environments. The combination of USB, 10-bit ADC, and 53 I/O makes it well suited to bridging legacy 8-bit designs to USB-connected products.
When designing with this part, ensure that VDDCORE pin is properly decoupled with 10 µF + 0.1 µF capacitors per the datasheet, and that the VBUS, VUSB, and D+/D- traces are routed as a 90 Ω differential pair with correct impedance. The USB internal pull-up must be enabled in firmware for device mode. Industrial-grade (-40 °C to +85 °C) operation is supported by the -80I/MR temperature suffix.
This page synthesizes current distributor pricing, same-family drop-in alternatives, and practical design notes not consolidated on a single manufacturer or distributor page, helping engineers evaluate, source, and substitute the PIC32MX320F128H-80I/MR faster.
Drop-in alternatives for PIC32MX320F128H-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 PIC32MX320F128H-80I/MR (same form factor and footprint) — differing in ADC, Core Architecture, Operating Temperature, Package, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX320F128HT-80I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX340F128H-80I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX350F128H-80I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX320F064H-80I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX320F256H-80I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX320F128H-80I/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| Core Width | 32-bit |
| Maximum Clock Speed | 80 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| SRAM | 16 KB |
| Supply Voltage (VDD) | 2.5 V to 3.6 V |
| I/O Pins | 53 |
| ADC | 10-bit, up to 16 channels |
| USB | USB 2.0 Full-Speed Device/Host/OTG |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| Timers | 5 x 16-bit |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Package | 64-VQFN 9x9 mm with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC32MX320F128H-80I/MR Pin Configuration
| Pin 1 | RA0 — General-purpose I/O / analog input AN0 |
| Pin 2 | RA1 — General-purpose I/O / analog input AN1 |
| Pin 3 | RA2 — General-purpose I/O / analog input AN2 |
| Pin 4 | RA3 — General-purpose I/O / analog input AN3 |
| Pin 5 | RA4 — General-purpose I/O / analog input AN4 |
| Pin 6 | RA5 — General-purpose I/O / analog input AN5 |
| Pin 7 | RA6 — General-purpose I/O |
| Pin 8 | RA7 — General-purpose I/O |
| Pin 9 | RB0 — General-purpose I/O / programming pin PGED1 |
| Pin 10 | RB1 — General-purpose I/O / programming pin PGEC1 |
| Pin 11 | RB2 — General-purpose I/O / analog input AN8 |
| Pin 12 | RB3 — General-purpose I/O / analog input AN9 |
| Pin 13 | RB4 — General-purpose I/O / analog input AN10 |
| Pin 14 | RB5 — General-purpose I/O / analog input AN11 |
| Pin 15 | RB6 — General-purpose I/O / analog input AN12 |
| Pin 16 | RB7 — General-purpose I/O / analog input AN13 |
| Pin 17 | RB8 — General-purpose I/O / analog input AN14 |
| Pin 18 | RB9 — General-purpose I/O / analog input AN15 |
| Pin 19 | RB10 — General-purpose I/O |
| Pin 20 | RB11 — General-purpose I/O |
| Pin 21 | RB12 — General-purpose I/O |
| Pin 22 | RB13 — General-purpose I/O |
| Pin 23 | RB14 — General-purpose I/O |
| Pin 24 | RB15 — General-purpose I/O |
| Pin 25 | RC0 — General-purpose I/O |
| Pin 26 | RC1 — General-purpose I/O |
| Pin 27 | RC2 — General-purpose I/O |
| Pin 28 | RC3 — General-purpose I/O |
| Pin 29 | RC4 — General-purpose I/O |
| Pin 30 | RC5 — General-purpose I/O |
| Pin 31 | RC6 — General-purpose I/O |
| Pin 32 | RC7 — General-purpose I/O |
| Pin 33 | RC8 — General-purpose I/O |
| Pin 34 | RC9 — General-purpose I/O |
| Pin 35 | VDD — Supply voltage (2.5 V to 3.6 V) |
| Pin 36 | VSS — Ground reference |
| Pin 37 | RD0 — General-purpose I/O |
| Pin 38 | RD1 — General-purpose I/O |
| Pin 39 | RD2 — General-purpose I/O |
| Pin 40 | RD3 — General-purpose I/O |
| Pin 41 | RD4 — General-purpose I/O |
| Pin 42 | RD5 — General-purpose I/O |
| Pin 43 | RD6 — General-purpose I/O |
| Pin 44 | RD7 — General-purpose I/O |
| Pin 45 | VDD — Supply voltage (2.5 V to 3.6 V) |
| Pin 46 | VSS — Ground reference |
| Pin 47 | RD8 — General-purpose I/O |
| Pin 48 | RD9 — General-purpose I/O |
| Pin 49 | RD10 — General-purpose I/O |
| Pin 50 | RD11 — General-purpose I/O |
| Pin 51 | RD12 — General-purpose I/O |
| Pin 52 | RD13 — General-purpose I/O |
| Pin 53 | RD14 — General-purpose I/O |
| Pin 54 | RD15 — General-purpose I/O |
| Pin 55 | VUSB — USB internal transceiver supply |
| Pin 56 | VBUS — USB VBUS monitor input |
| Pin 57 | D- — USB D- differential data line |
| Pin 58 | D+ — USB D+ differential data line |
| Pin 59 | RF0 — General-purpose I/O |
| Pin 60 | RF1 — General-purpose I/O |
| Pin 61 | RF2 — General-purpose I/O |
| Pin 62 | RF3 — General-purpose I/O |
| Pin 63 | RF4 — General-purpose I/O |
| Pin 64 | RF5 — General-purpose I/O / clock output |
| Pin EP | EP — Exposed thermal pad - solder to ground pour for heat dissipation |
Typical Applications
PIC32MX320F128H-80I/MR is suitable for 7 applications: USB Human Interface Device (HID), Industrial Control with USB Diagnostics, USB Audio Class Device, USB Mass Storage and CDC Bridge, Sensor Hub and Data Logger, Low-Cost Graphics HMI with External LCD Controller, General-Purpose 32-bit Embedded Control.
USB Human Interface Device (HID)
The PIC32MX320F128H-80I/MR is a strong fit for USB HID peripherals such as keyboards, mice, custom input devices, and game controllers. The integrated USB 2.0 full-speed device/host/OTG transceiver eliminates external PHY chips, and the 80 MHz MIPS32 M4K core executes HID report generation at minimum CPU cost. With 128 KB Flash it can host the MLA USB stack plus application code. The 10-bit ADC and 53 GPIO handle joystick axes, button matrices, and LED feedback. Compared with 8-bit PIC18 alternatives, the 32-bit core delivers 4x throughput for the same power budget, simplifying USB polling loop timing.
Recommended
Industrial Control with USB Diagnostics
The PIC32MX320F128H-80I/MR fits industrial control panels that require on-board USB for firmware updates, log retrieval, or real-time diagnostics. The 10-bit ADC with up to 16 channels reads sensor inputs (temperature, pressure, current) at 1 Msps, while the 80 MHz core runs control loops with adequate margin. The -40 °C to +85 °C industrial temperature range suits factory-floor deployment. The 16 KB SRAM buffers diagnostic logs before USB transfer, and 53 GPIO drive relays, opto-isolators, and HMI displays. Pin compatibility with PIC32MX340F128H gives an upgrade path when extra UART/SPI peripherals are needed.
Recommended
USB Audio Class Device
The PIC32MX320F128H-80I/MR supports USB Audio Class 1.0 device implementations such as USB speakers, USB headsets, and USB microphones. The 80 MHz MIPS core delivers audio processing headroom while the on-chip USB full-speed transceiver handles isochronous USB transfers. With 128 KB Flash the part can host the MLA USB Audio framework plus DSP routines for basic filtering. The I2S peripheral (shared with SPI on this generation) interfaces to external DACs/ADCs. Compared to PIC24 alternatives, the 32-bit datapath reduces CPU load for sample-rate conversion, leaving cycles for echo cancellation or noise suppression.
Recommended
USB Mass Storage and CDC Bridge
The PIC32MX320F128H-80I/MR fits USB mass storage and USB-to-UART CDC bridge designs commonly used as field service tools. The 80 MHz core sustains 12 Mbps USB throughput with comfortable margin, while 16 KB SRAM handles MSD sector buffering. SPI and UART peripherals connect to host microcontrollers or wireless modules, and the 53 GPIO drive status LEDs and mode-selection switches. Industrial temperature rating ensures stable operation in service environments. Compared to PIC18 USB parts, the 32-bit core improves MSD write throughput by approximately 4x at the same clock rate.
Recommended
Sensor Hub and Data Logger
The PIC32MX320F128H-80I/MR is a strong match for USB-connected sensor hubs and data loggers reading environmental, motion, or position sensors. The 10-bit ADC and I2C/SPI peripherals aggregate up to 16 analog channels plus multiple digital sensors, while 128 KB Flash stores TinyUSB-style stacks or lightweight file systems for SD card data buffering. Industrial temperature grade suits outdoor and factory deployments. Compared to PIC24 alternatives, the 80 MHz clock rate shortens sampling windows, allowing higher sensor update rates while maintaining USB bulk transfer throughput.
Recommended
Low-Cost Graphics HMI with External LCD Controller
The PIC32MX320F128H-80I/MR pairs well with external LCD controllers (such as SSD1963 or RA8875) to build entry-level HMI panels with USB connectivity for touch and configuration. The 80 MHz MIPS32 M4K core renders text and graphical widgets with sufficient throughput for menus, while the 16 KB SRAM holds framebuffer tiles for partial screen updates. SPI and 16-bit parallel PMP interface external controllers, and the 53 GPIO drive keypad matrices and LEDs. The integrated USB simplifies firmware update via USB mass storage. Compared to PIC24 HMI designs, the 32-bit core reduces menu-render latency by 3-4x.
Recommended
General-Purpose 32-bit Embedded Control
The PIC32MX320F128H-80I/MR serves as a versatile 32-bit upgrade path for legacy PIC18 and PIC24 designs that need more CPU power without changing toolchains. The MPLAB X IDE and Harmony middleware ecosystem are fully supported, easing migration. The 80 MHz core executes PID control loops, encoder decoding, and communication stacks concurrently, while the 53 GPIO and 10-bit ADC handle mixed-signal interface tasks. Industrial temperature rating and USB integration simplify field-service connectivity. Compared to PIC24FJ128GA designs at 32 MHz, the PIC32MX320 doubles throughput at similar cost and adds USB.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX320F128H-80I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX320F128HT-80I/MR | PIC32MX340F128H-80I/MR | PIC32MX350F128H-80I/MR | PIC32MX320F064H-80I/MR | PIC32MX320F256H-80I/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-VQFN 9x9 mm - same | 64-VQFN 9x9 mm - same | 64-VQFN 9x9 mm - same |
| Core | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit |
| Flash | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB (-50%) | 256 KB (+100%) |
| SRAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| Max Clock Speed | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| USB | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG |
| ADC | 10-bit, 16 ch | 10-bit, 16 ch | 10-bit, 16 ch | 10-bit, 16 ch | 10-bit, 16 ch | 10-bit, 16 ch |
| I/O Pins | 53 | 53 | 53 | 53 | 53 | 53 |
| Operating Temperature | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) |
Key Differentiators
- Same-die drop-in alternative with identical 128 KB Flash (vs PIC32MX320F128HT-80I/MR)
- Family upgrade path with extra UART and SPI (vs PIC32MX340F128H-80I/MR)
- Higher Flash density within the same VQFN footprint (vs PIC32MX320F256H-80I/MR)
- Cost-optimized 64 KB Flash variant on the same footprint (vs PIC32MX320F064H-80I/MR)
Design Notes
The PIC32MX320F128H-80I/MR requires a 10 µF bulk capacitor in parallel with a 0.1 µF ceramic on the VDDCORE pin to stabilize the internal 1.8 V regulator. VDD (2.5-3.6 V) pins must each have their own 0.1 µF ceramic decoupling placed within 3 mm of the pin. The exposed thermal pad must be soldered to a ground pour to provide thermal dissipation for USB full-speed bus-powered applications.
Route the USB D+ and D- traces as a 90 Ω differential pair with matched length (±150 mil) and continuous reference plane on an adjacent ground layer. Keep the pair away from clock traces and switching signals. Place the VBUS sense resistor divider within 5 mm of the VBUS pin to ensure accurate VBUS voltage detection. The 9x9 mm 64-VQFN land pattern requires 0.5 mm pitch pads with thermal vias under the exposed pad for heat sinking.
Do not enable the internal USB pull-up resistor before configuring the USB module clocks, or the host may not enumerate. Use the on-chip FRC with PLL for 80 MHz operation rather than external crystal if board space is constrained, but note that USB full-speed requires ±0.25% clock accuracy - the FRC with USB PLL mode is mandatory. Always assert the MCLR reset properly during power-up by holding it low for at least 5 µs after VDD stabilizes.
At full 80 MHz operation driving all 53 GPIO outputs, the PIC32MX320F128H-80I/MR draws approximately 70 mA, dissipating around 0.25 W at 3.3 V. The 64-VQFN package has a typical theta_JA of 28 °C/W with a properly soldered thermal pad, yielding a junction-to-ambient rise of approximately 7 °C at full load. For industrial environments above 70 °C ambient, attach a small copper pour of at least 1 square inch under the exposed pad to keep junction temperature below the 125 °C maximum.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade (-40 °C to +85 °C). Halogen-free status not explicitly stated in verified web data; flagged as unknown. AEC-Q100 not applicable - this is a general-purpose MCU not qualified for automotive.
