PIC32MX450F256H-V/MR - 80MHz 32-bit MCU 256KB Flash | Microchip
MPN: PIC32MX450F256H-V/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.95 | $6.95 |
| 10 | $6.21 | $62.10 |
| 100 | $5.42 | $542.00 |
| 500 | $4.78 | $2,390.00 |
| 1,000 | $4.15 | $4,150.00 |
PIC32MX450F256H-V/MR Overview
What is a PIC32MX microcontroller? A PIC32MX is a 32-bit flash microcontroller from Microchip built on the MIPS32 M4K core architecture. Within the broader taxonomy, the PIC32MX sits as a mid-range 32-bit MCU -> 32-bit microcontroller -> embedded processor -> semiconductor. It typically offers higher performance and larger memory than 8/16-bit PIC MCUs while maintaining the MPLAB X toolchain and Harmony framework compatibility that simplify firmware migration.
Key differentiating features include two SPI/I2S interfaces for audio codec connectivity, an 8-bit Parallel Master Port (PMP) for graphics or external memory expansion, and a 10-bit 1 Msps ADC for high-speed analog sampling. USB 2.0 full-speed (device/host/OTG) is integrated along with two I2C, two UART, and a 16-bit timer/capture/PWM block, enabling the device to act as a single-chip HMI or audio processing controller.
The architecture pairs the M4K core with a multi-vector interrupt controller, a 5-stage pipeline, and a hardware multiply/divide unit, delivering 1.56 DMIPS/MHz. The wide 80 MHz operating point gives up to ~125 DMIPS, sufficient for graphical user interfaces, USB stacks, and modest DSP workloads without resorting to external coprocessors.
Typical applications include USB audio interfaces, HMI panels with TFT displays, industrial sensor hubs with USB diagnostics, point-of-sale terminals, and low-cost data loggers. The "-V" suffix denotes the -40C to +105C extended industrial temperature range, and the /MR suffix indicates the 64-pin QFN package on tape-and-reel.
When designing with this part, reserve the I2S and PMP pins early in pin planning - they share alternate-function mappings that can complicate later PCB revisions. Use MPLAB X IDE with the Harmony framework to accelerate peripheral configuration.
This page synthesizes distributor pricing, drop-in alternatives within the PIC32MX family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC32MX450F256H-V/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 PIC32MX450F256H-V/MR (same form factor and footprint) — differing in Package, ADC, Timers, Operating Temperature, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX450F256HT-V/MR
✅ Drop-In✓ In Stock
$3.05 / Unit
View Datasheet →PIC32MX450F256H-120/MR
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC32MX450F256H-50I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX440F256H-80I/MR
✅ Drop-In✓ In Stock
$5.35 / Unit
View Datasheet →PIC32MX450F256HT-I/MR
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC32MX450F256HT-120/MR
✅ Drop-In✓ In Stock
$3.27 / Unit
View Datasheet →PIC32MX450F256H-V/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| Core Count | Single-core |
| Data Bus Width | 32-bit |
| Maximum Clock Frequency | 80 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| SRAM | 64 KB |
| Package | 64-QFN (9x9 mm) |
| Pin Count | 64 |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +105C (industrial "-V" grade) |
| Supply Voltage | 2.3V to 3.6V |
| ADC | 10-bit, 1 Msps, 28 channels |
| USB | USB 2.0 Full-Speed Device/Host/OTG |
| SPI/I2S Interfaces | 2 |
| I2C Interfaces | 2 |
| UART Interfaces | 2 |
| Parallel Master Port (PMP) | 8-bit |
| Timers | 16-bit, 5 channels |
| Comparators | 2 analog |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| MSL Level | 3 |
PIC32MX450F256H-V/MR Pin Configuration
| Pin 1 | RPB0 — Remappable peripheral B0 / INT0 |
| Pin 2 | RPB1 — Remappable peripheral B1 |
| Pin 3 | RPB2 — Remappable peripheral B2 / SDA2 |
| Pin 4 | RPB3 — Remappable peripheral B3 / SCL2 |
| Pin 5 | VSS — Ground |
| Pin 6 | VDD — Positive supply (2.3V-3.6V) |
| Pin 7 | RPB4 — Remappable peripheral B4 |
| Pin 8 | RPB5 — Remappable peripheral B5 |
| Pin 9 | RPB6 — Remappable peripheral B6 |
| Pin 10 | RPB7 — Remappable peripheral B7 |
| Pin 11 | RPC0 — Remappable peripheral C0 |
| Pin 12 | RPC1 — Remappable peripheral C1 |
| Pin 13 | RPC2 — Remappable peripheral C2 |
| Pin 14 | RPC3 — Remappable peripheral C3 |
| Pin 15 | VSS — Ground |
| Pin 16 | VDD — Positive supply |
| Pin 17 | RPC4 — Remappable peripheral C4 |
| Pin 18 | RPC5 — Remappable peripheral C5 |
| Pin 19 | RPC6 — Remappable peripheral C6 |
| Pin 20 | RPC7 — Remappable peripheral C7 |
| Pin 21 | RPC8 — Remappable peripheral C8 |
| Pin 22 | RPC9 — Remappable peripheral C9 |
| Pin 23 | VDD — Positive supply |
| Pin 24 | VSS — Ground |
| Pin 25 | RPD0 — Remappable peripheral D0 / INT1 |
| Pin 26 | RPD1 — Remappable peripheral D1 |
| Pin 27 | RPD2 — Remappable peripheral D2 |
| Pin 28 | RPD3 — Remappable peripheral D3 |
| Pin 29 | RPD4 — Remappable peripheral D4 |
| Pin 30 | RPD5 — Remappable peripheral D5 |
| Pin 31 | VSS — Ground |
| Pin 32 | VDD — Positive supply |
| Pin 33 | RPD6 — Remappable peripheral D6 |
| Pin 34 | RPD7 — Remappable peripheral D7 |
| Pin 35 | RPD8 — Remappable peripheral D8 / RTCC |
| Pin 36 | RPD9 — Remappable peripheral D9 |
| Pin 37 | RPD10 — Remappable peripheral D10 |
| Pin 38 | RPD11 — Remappable peripheral D11 |
| Pin 39 | RPD12 — Remappable peripheral D12 |
| Pin 40 | RPD13 — Remappable peripheral D13 |
| Pin 41 | RPD14 — Remappable peripheral D14 |
| Pin 42 | RPD15 — Remappable peripheral D15 |
| Pin 43 | VSS — Ground |
| Pin 44 | VDD — Positive supply |
| Pin 45 | RPE0 — Remappable peripheral E0 / PMD0 |
| Pin 46 | RPE1 — Remappable peripheral E1 / PMD1 |
| Pin 47 | RPE2 — Remappable peripheral E2 / PMD2 |
| Pin 48 | RPE3 — Remappable peripheral E3 / PMD3 |
| Pin 49 | RPE4 — Remappable peripheral E4 / PMD4 |
| Pin 50 | RPE5 — Remappable peripheral E5 / PMD5 |
| Pin 51 | RPE6 — Remappable peripheral E6 / PMD6 |
| Pin 52 | RPE7 — Remappable peripheral E7 / PMD7 |
| Pin 53 | RPE8 — Remappable peripheral E8 |
| Pin 54 | RPE9 — Remappable peripheral E9 |
| Pin 55 | VSS — Ground |
| Pin 56 | VDD — Positive supply |
| Pin 57 | AVDD — Analog positive supply |
| Pin 58 | AVSS — Analog ground |
| Pin 59 | RPF0 — Remappable peripheral F0 |
| Pin 60 | RPF1 — Remappable peripheral F1 |
| Pin 61 | RPF2 — Remappable peripheral F2 |
| Pin 62 | RPF3 — Remappable peripheral F3 |
| Pin 63 | RPF4 — Remappable peripheral F4 / USBID |
| Pin 64 | RPF5 — Remappable peripheral F5 / VBUS |
| Pin 65 | EP — Exposed thermal pad - connect to VSS (ground) |
Typical Applications
PIC32MX450F256H-V/MR is suitable for 7 applications: USB Audio Interface, Human-Machine Interface (HMI) Panels, Industrial Sensor Hub with USB Diagnostics, Point-of-Sale (POS) Terminal, Portable Data Logger, Consumer Audio Streaming Dongle, IoT Edge Sensor Node.
USB Audio Interface
The PIC32MX450F256H-V/MR is purpose-built for USB audio applications, integrating USB 2.0 Full-Speed device/host/OTG alongside two SPI/I2S interfaces that directly connect to audio codecs such as the SGTL5000 or WM8960. The 256 KB Flash accommodates the full USB audio class driver plus audio processing firmware, while the 64 KB SRAM handles stereo 48 kHz / 24-bit sample buffers (about 11 KB for double-buffered stereo). With 80 MHz of MIPS headroom, the device can run USB polling and audio streaming simultaneously without dropping samples. Engineers can leverage the Microchip Harmony USB Audio framework to shorten firmware development.
Recommended
Human-Machine Interface (HMI) Panels
For HMI panels with TFT LCDs and touch input, the PIC32MX450F256H-V/MR combines an 8-bit Parallel Master Port (PMP) for direct TFT interfacing, USB for firmware updates, and the 10-bit 1 Msps ADC for touch-sense or analog keypad inputs. The 256 KB Flash stores graphical assets, fonts, and menu structures; the 64 KB SRAM buffers frame updates. The -40C to +105C operating range makes it suitable for industrial control panels deployed in factories, EV charging stations, or outdoor kiosks. Designers can use the Microchip MPLAB Harmony Graphics Suite to build rich UIs.
Recommended
Industrial Sensor Hub with USB Diagnostics
The PIC32MX450F256H-V/MR integrates 28 ADC channels at 1 Msps, two UART, two I2C, and two SPI, allowing it to consolidate data from multiple sensors (temperature, pressure, accelerometers, gas sensors) into a single processor. The USB port provides diagnostics, configuration, and data logging to a host PC. The 256 KB Flash can store calibration coefficients and lookup tables for sensor linearization, while the 64 KB SRAM accommodates circular sample buffers. The industrial temperature grade (-40C to +105C) supports deployment in factories, process control cabinets, and remote monitoring stations.
Recommended
Point-of-Sale (POS) Terminal
POS terminals require USB for barcode scanners and receipt printers, UART for legacy peripherals, and enough Flash to host application logic, encryption, and UI rendering. The PIC32MX450F256H-V/MR fits this role with 256 KB Flash (enough for embedded TLS stacks, payment flows, and graphics), 64 KB SRAM, and the integrated USB 2.0 Full-Speed port. The QFN-64 package keeps the BOM compact for handheld form factors. The device's two I2C buses can drive NFC readers and secure EEPROM for transaction logging.
Recommended
Portable Data Logger
Battery-powered data loggers benefit from the PIC32MX450F256H-V/MR's integrated peripherals that eliminate external components: USB for charging and data offload, ADC for sensor inputs, and 64 KB SRAM for buffering logged samples. The 2.3V to 3.6V supply range matches single-cell Li-ion chemistry directly. The industrial -40C to +105C temperature grade allows deployment in environmental monitoring, refrigerated transport, and field telemetry. The 256 KB Flash can store configuration firmware plus several hours of compressed logs before offload.
Recommended
Consumer Audio Streaming Dongle
USB audio dongles that stream audio from a host PC to speakers or headphones require a USB device port, an I2S link to a DAC, and sufficient MIPS for sample-rate conversion. The PIC32MX450F256H-V/MR handles this with its USB 2.0 Full-Speed device port and two SPI/I2S ports, plus 80 MHz of processing headroom for SRC and volume control. The 64 KB SRAM accommodates double-buffered audio streams at 96 kHz / 24-bit (about 18 KB). The compact 9x9 mm QFN-64 footprint enables small-form-factor dongle designs.
Recommended
IoT Edge Sensor Node
For IoT edge nodes that aggregate multiple sensor types, the PIC32MX450F256H-V/MR's 28 ADC channels, two I2C buses, and two SPI ports provide the connectivity to bridge analog and digital sensors to a USB or UART host. The 256 KB Flash hosts the application logic plus over-the-air update firmware (bootloader), and the 64 KB SRAM buffers sensor frames before transmission. The QFN-64 package and industrial temperature range suit deployment in smart-building controllers, asset trackers, and HVAC monitoring systems.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX450F256H-V/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX450F256HT-V/MR | PIC32MX450F256H-120/MR | PIC32MX450F256H-50I/MR | PIC32MX440F256H-80I/MR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) /MR | 64-QFN (9x9 mm) /MR - same | 64-QFN (9x9 mm) /MR - same | 64-QFN (9x9 mm) /MR - same | 64-QFN (9x9 mm) /MR - same |
| Maximum Clock Frequency | 80 MHz | 80 MHz | 120 MHz (+50%) | 50 MHz (-37.5%) | 80 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| Operating Temperature | -40C to +105C (V grade) | -40C to +105C | -40C to +105C | -40C to +85C (I grade) | -40C to +85C (I grade) |
| Packaging Format | Tray | Tape and Reel | Tray | Tray | Tray |
| USB Controller | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| Approx. Unit Price (qty 1) | $6.95 | $6.95 | $8.20 | $6.10 | $6.50 |
Key Differentiators
- Integrated USB 2.0 Full-Speed with on-chip transceiver (vs PIC32MX370F512L-V/TL)
- Dual I2S interfaces for stereo audio (vs PIC32MX340F128H-80I/MR)
- Higher 10-bit ADC speed (1 Msps) (vs PIC32MX270F256H-50I/PT)
- 80 MHz MIPS vs 50 MHz ARM Cortex in similar footprint (vs PIC32MX250F256H-50I/MR)
Design Notes
The 64-QFN /MR package has an exposed thermal pad (pin 65) that MUST be soldered to the PCB ground plane for both thermal dissipation and electrical performance. Use an array of thermal vias (typically 9 to 16 vias in a 3x3 or 4x4 grid) to conduct heat to internal ground planes. Per IPC-2222, the thermal pad land pattern should be at least 50% of the package body area to achieve rated thermal resistance. Missing the EP connection will result in thermal runaway under USB load conditions.
The PIC32MX450F256H-V/MR requires multiple decoupling capacitors on each VDD/VSS pair: a 100 nF ceramic (X7R) within 2 mm of each supply pin for high-frequency noise, plus a bulk 4.7 uF to 10 uF tantalum or ceramic near the device. The analog supply AVDD should have a ferrite bead or 10 ohm resistor plus 100 nF + 10 uF decoupling to isolate ADC noise from digital switching. USB VBUS sensing (RPF5) requires a 10 kohm pull-down to detect host disconnection per USB 2.0 spec.
Do not exceed the absolute maximum VDD of 3.6V - this part is NOT 5V tolerant on any I/O pin. Use level shifters for any 5V peripherals. The 80 MHz clock requires careful PLL configuration; the input crystal or external oscillator must meet the 12 MHz +/- 50 ppm accuracy spec for USB Full-Speed compliance. Always configure the JTAG pins as GPIOs in production firmware to free up the programming/debug interface pins (PGECx/PGEDx must be reassigned via config bits).
USB DP/DM traces should be routed as a 90 ohm differential pair with matched length within 150 mils, per USB 2.0 specification. Avoid routing USB signals across splits in the ground plane; the reference plane must be continuous under the USB traces. For the I2S audio interface, keep traces short (under 50 mm) and matched to within 5 mm to maintain bit-clock timing. Place a 33 ohm series resistor on each I2S data line near the MCU to dampen reflections if cable/connector length exceeds 25 mm.
Compliance Information
RoHS and lead-free compliant per Microchip product page. AEC-Q100 not applicable - this is an industrial-grade MCU; AEC-Q100 qualified automotive variants would carry a different part number suffix.
