PIC32MX450F128H-I/MR - 80MHz 128KB Flash 32-bit MCU | Microchip
MPN: PIC32MX450F128H-I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.15 | $515.00 |
| 500 | $4.6 | $2,300.00 |
| 1,000 | $4.1 | $4,100.00 |
PIC32MX450F128H-I/MR Overview
A 32-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, Flash program memory, SRAM data memory, and a rich set of peripherals (timers, ADC, communication controllers) on one silicon die. The PIC32MX family uses the MIPS32 architecture with the M4K microAptiv core, providing 1.56 DMIPS/MHz performance. Within the broader microcontroller hierarchy, the PIC32MX3/4 line sits between 8-bit PIC16/PIC18 devices and 32-bit Cortex-M based MCUs, offering higher performance than 8-bit parts with simpler toolchains than ARM Cortex-M.
Key features include 128 KB Flash, 32 KB SRAM, up to 53 available I/O pins via Peripheral Pin Select, a 10-bit 1 Msps ADC with up to 28 input channels, two analog comparators, two I2C, two SPI/I2S, two UART modules, and a Charge Time Measurement Unit (CTMU) for touch and capacitive sensing. The CTMU enables capacitive touch buttons, sliders, and proximity sensing without external analog ICs.
The PIC32MX450F128H-I/MR operates from 2.3V to 3.6V, supports -40C to +85C industrial temperature range, and offers 5V-tolerant digital I/O. The integrated USB 2.0 Full-Speed OTG controller supports device, host, and On-The-Go modes, eliminating the need for an external USB transceiver. The Peripheral Pin Select feature allows most digital peripherals to be remapped to any of several I/O pins, simplifying PCB layout.
Typical applications include USB peripherals (HID, CDC, mass storage), audio interfaces using I2S, graphics with PMP-driven TFT panels, capacitive touch HMI using CTMU, industrial control with CAN-free connectivity, and consumer embedded devices requiring USB connectivity. The wide peripheral integration reduces external component count and BOM cost in connected embedded products.
Designers should note the 64-pin VQFN (MR) footprint has an exposed thermal pad that must be soldered to the PCB ground plane for proper thermal dissipation and electrical performance. The 9x9 mm body allows routing escape for the 53 I/O signals. Decoupling capacitors (100 nF + 4.7 uF) must be placed within 3 mm of each VDD/VSS pair to ensure stable core and I/O operation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC32MX450F128H-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 PIC32MX450F128H-I/MR (same form factor and footprint) — differing in Package, USB, Core Architecture, ADC, DMA Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX450F256H-I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX350F128H-I/MR
✅ Drop-In✓ In Stock
$2.98 / Unit
View Datasheet →PIC32MX440F128H-80I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX450F128H-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX270F512H-I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX170F256H-I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX450F128H-I/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| Maximum CPU Frequency | 80 MHz |
| Performance | 100 MIPS (Dhrystone 2.1) |
| Program Flash Memory | 128 KB |
| Data SRAM | 32 KB |
| Operating Voltage | 2.3 V to 3.6 V |
| I/O Pins (max) | 53 |
| Package | 64-VQFN (9x9 mm) with exposed pad |
| USB | USB 2.0 Full-Speed OTG (Device/Host/OTG) |
| SPI / I2S Modules | 2 |
| I2C Modules | 2 |
| UART Modules | 2 |
| ADC | 10-bit, up to 28 channels, 1 Msps |
| Analog Comparators | 2 |
| CTMU | Yes (Charge Time Measurement Unit) |
| Peripheral Pin Select (PPS) | Yes |
| Parallel Master Port (PMP) | Yes |
| Operating Temperature | -40 C to +85 C (industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC32MX450F128H-I/MR Pin Configuration
| Pin 1 | RP15/RF0 — Remappable peripheral I/O pin (Peripheral Pin Select) |
| Pin 2 | RP14/RF1 — Remappable peripheral I/O pin |
| Pin 3 | RP13/RF2 — Remappable peripheral I/O pin |
| Pin 4 | RP12/RF3 — Remappable peripheral I/O pin |
| Pin 5 | RP11/RF4 — Remappable peripheral I/O pin |
| Pin 6 | RP10/RF5 — Remappable peripheral I/O pin |
| Pin 7 | VDD — Digital supply voltage (3.3V typical) |
| Pin 8 | VSS — Digital ground |
| Pin 9 | OSC1/RC13 — Oscillator input or GPIO |
| Pin 10 | OSC2/RC14 — Oscillator output or GPIO |
| Pin 11 | D+/RG2 — USB D+ data line (USB OTG) |
| Pin 12 | D-/RG3 — USB D- data line (USB OTG) |
| Pin 13 | VUSB — USB internal transceiver supply |
| Pin 14 | VDD — Digital supply voltage |
| Pin 15 | VSS — Digital ground |
| Pin 16 | RB0 — GPIO port B pin 0 (PPS-capable) |
| Pin 17 | RB1 — GPIO port B pin 1 (PPS-capable) |
| Pin 18 | RB2 — GPIO port B pin 2 (PPS-capable) |
| Pin 19 | RB3 — GPIO port B pin 3 (PPS-capable) |
| Pin 20 | RB4 — GPIO port B pin 4 (PPS-capable) |
| Pin 21 | RB5 — GPIO port B pin 5 (PPS-capable, PGED1) |
| Pin 22 | RB6 — GPIO port B pin 6 (PPS-capable, PGEC1) |
| Pin 23 | RB7 — GPIO port B pin 7 (PPS-capable) |
| Pin 24 | RA0 — GPIO port A pin 0 |
| Pin 25 | RA1 — GPIO port A pin 1 |
| Pin 26 | RA2 — GPIO port A pin 2 |
| Pin 27 | RA3 — GPIO port A pin 3 |
| Pin 28 | RA4 — GPIO port A pin 4 |
| Pin 29 | RA5 — GPIO port A pin 5 |
| Pin 30 | RA6 — GPIO port A pin 6 |
| Pin 31 | RA7 — GPIO port A pin 7 |
| Pin 32 | RC0 — GPIO port C pin 0 |
| Pin 33 | RC1 — GPIO port C pin 1 |
| Pin 34 | RC2 — GPIO port C pin 2 |
| Pin 35 | RD0 — GPIO port D pin 0 (PMP data) |
| Pin 36 | RD1 — GPIO port D pin 1 (PMP data) |
| Pin 37 | RD2 — GPIO port D pin 2 (PMP data) |
| Pin 38 | RD3 — GPIO port D pin 3 (PMP data) |
| Pin 39 | RD4 — GPIO port D pin 4 (PMP data) |
| Pin 40 | RD5 — GPIO port D pin 5 (PMP data) |
| Pin 41 | RD6 — GPIO port D pin 6 (PMP data) |
| Pin 42 | RD7 — GPIO port D pin 7 (PMP data) |
| Pin 43 | RE0 — GPIO port E pin 0 (PMP control) |
| Pin 44 | RE1 — GPIO port E pin 1 (PMP control) |
| Pin 45 | RE2 — GPIO port E pin 2 (PMP control) |
| Pin 46 | RE3 — GPIO port E pin 3 (PMP control) |
| Pin 47 | RE4 — GPIO port E pin 4 (PMP control) |
| Pin 48 | RE5 — GPIO port E pin 5 (PMP control) |
| Pin 49 | RE6 — GPIO port E pin 6 (PMP control) |
| Pin 50 | RE7 — GPIO port E pin 7 (PMP control) |
| Pin 51 | RF0 — GPIO port F pin 0 |
| Pin 52 | RF1 — GPIO port F pin 1 |
| Pin 53 | RF2 — GPIO port F pin 2 |
| Pin 54 | RF3 — GPIO port F pin 3 |
| Pin 55 | RF4 — GPIO port F pin 4 |
| Pin 56 | RF5 — GPIO port F pin 5 |
| Pin 57 | RF6 — GPIO port F pin 6 |
| Pin 58 | RF7 — GPIO port F pin 7 |
| Pin 59 | RG0 — GPIO port G pin 0 |
| Pin 60 | RG1 — GPIO port G pin 1 |
| Pin 61 | RG6 — GPIO port G pin 6 |
| Pin 62 | RG7 — GPIO port G pin 7 |
| Pin 63 | RG8 — GPIO port G pin 8 |
| Pin 64 | RG9 — GPIO port G pin 9 |
Typical Applications
PIC32MX450F128H-I/MR is suitable for 7 applications: USB Human Interface Devices (HID), Audio Interfaces using I2S, Capacitive Touch HMI Panels, Graphics TFT Displays, Industrial Sensor Hubs, USB Mass Storage Devices, Consumer Wearable Devices.
USB Human Interface Devices (HID)
The PIC32MX450F128H-I/MR's integrated USB 2.0 Full-Speed OTG controller makes it ideal for USB HID peripherals such as keyboards, mice, game controllers, and custom input devices. With 80 MHz MIPS32 M4K performance, the MCU handles HID report descriptors and polling at the standard 1 ms interval with significant processing headroom. The 128 KB Flash accommodates USB stacks plus HID class drivers from MPLAB Harmony, while 32 KB SRAM is ample for HID buffers and protocol state. Designers benefit from the on-chip USB transceiver that eliminates external PHY components, reducing BOM cost and PCB area. Recommended companion MPNs include MCP1700 (3.3V LDO regulator) and PIC32MX450F256H-I/MR (drop-in 256KB Flash upgrade).
Recommended
Audio Interfaces using I2S
The two integrated I2S/SP I modules on the PIC32MX450F128H-I/MR enable direct connection to external audio codecs for applications such as USB audio speakers, headphone amplifiers, and digital audio playback devices. Operating at 80 MHz, the MCU can process 48 kHz 16-bit stereo audio with comfortable CPU margin for additional signal processing. The 32 KB SRAM buffers audio sample frames comfortably, while 128 KB Flash accommodates audio class drivers and effect libraries. Combined with USB OTG, this creates a complete USB-to-I2S audio bridge solution. The MPLAB Harmony USB Audio class driver stack simplifies development for USB headphone and USB speaker products.
Recommended
Capacitive Touch HMI Panels
The PIC32MX450F128H-I/MR's Charge Time Measurement Unit (CTMU) provides hardware-based capacitive touch sensing for buttons, sliders, and proximity sensors without an external touch IC. Combined with Peripheral Pin Select (PPS), the designer can route CTMU channels to any GPIO pin, simplifying PCB layout for HMI front panels. The 80 MHz core runs the mTouch touch algorithm at high refresh rates (over 100 Hz for full button matrix), enabling responsive touch UX. The 128 KB Flash accommodates touch libraries plus application firmware, while USB OTG enables touch panels with USB connectivity to a host. This combination is ideal for appliances, industrial controls, and consumer devices requiring sealed touch interfaces.
Recommended
Graphics TFT Displays
The Parallel Master Port (PMP) on the PIC32MX450F128H-I/MR provides an 8/16-bit parallel bus for direct connection to small TFT LCD panels, enabling graphical user interfaces without an external display controller. The 80 MHz MIPS32 M4K core can drive QVGA (320x240) panels with simple GUIs at reasonable frame rates. Combined with USB OTG, designers can build USB-connected display modules, instrumentation front panels, and control HMI screens. The 32 KB SRAM limits framebuffer size, but PMP supports tearing-free updates via direct pixel writes. MPLAB Harmony graphics library (Aria) provides widgets, fonts, and drawing primitives for rapid HMI development.
Recommended
Industrial Sensor Hubs
The PIC32MX450F128H-I/MR serves as an industrial sensor hub, aggregating data from analog sensors via its 10-bit 1 Msps ADC (up to 28 channels) and digital sensors via I2C/SPI, then transmitting via USB to a host PC or PLC. The two integrated analog comparators support threshold detection for alarm outputs, while CTMU enables capacitive level sensing for liquid or material detection. The industrial -40C to +85C temperature range suits factory environments. Combined with USB OTG, the device presents as a USB composite device (HID + CDC) to the host, simplifying PC-side driver integration for SCADA or lab software.
Recommended
USB Mass Storage Devices
USB mass storage class implementation on the PIC32MX450F128H-I/MR enables building USB flash drives, SD card readers, and data loggers that appear as removable storage to a host PC. The integrated Full-Speed USB OTG controller supports the bulk-only transport (BBB) protocol with adequate throughput at 12 Mbps for typical data logging workloads. The 128 KB Flash accommodates the MSD class driver plus FAT file system library, while 32 KB SRAM is sufficient for sector buffers. Designers can add an SD card via SPI or PMP for removable memory, creating a complete USB card reader in a small BOM. MPLAB Harmony USB MSD driver stack simplifies development.
Recommended
Consumer Wearable Devices
The compact 9x9 mm 64-VQFN package and integrated peripherals of the PIC32MX450F128H-I/MR make it suitable for compact wearable products such as fitness bands, smart watches, and health monitoring patches. USB OTG enables charging and data sync via a standard micro-USB or USB-C connector, while CTMU supports capacitive touch buttons for user input on the wearable surface. The 80 MHz core runs sensor fusion algorithms at low enough duty cycle to enable battery-powered operation when paired with appropriate sleep modes. Low-power peripherals (RTCC, deep sleep) and the small VQFN footprint suit wearable form factors where board area is constrained.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX450F128H-I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX450F256H-I/MR | PIC32MX350F128H-I/MR | PIC32MX440F128H-80I/MR | PIC32MX270F512H-I/MR | PIC32MX170F256H-I/MR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-VQFN (MR) | 64-VQFN (MR) | 64-VQFN (MR) | 64-VQFN (MR) | 64-VQFN (MR) | 64-VQFN (MR) |
| Core | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| Max Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 50 MHz |
| Flash Memory | 128 KB | 256 KB | 128 KB | 128 KB | 512 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB | 64 KB |
| USB OTG | Yes (FS OTG) | Yes (FS OTG) | No | No | Yes | No |
| CTMU Touch | Yes | Yes | No | No | Yes | No |
| Operating Voltage | 2.3V to 3.6V | 2.3V to 3.6V | 2.3V to 3.6V | 2.3V to 3.6V | 2.3V to 3.6V | 2.3V to 3.6V |
| Approx. 1k Price (USD) | $4.10 | $5.20 (est.) | $3.80 (est.) | $4.50 (est.) | $5.80 (est.) | $3.40 (est.) |
Key Differentiators
- Integrated USB 2.0 Full-Speed OTG with on-chip transceiver (vs PIC32MX350F128H-I/MR)
- Charge Time Measurement Unit (CTMU) for capacitive touch (vs PIC32MX440F128H-80I/MR)
- Drop-in 256 KB Flash upgrade path (vs PIC32MX450F256H-I/MR)
- PMP parallel master port for direct TFT connection (vs PIC32MX170F256H-I/MR)
Design Notes
Estimated: The PIC32MX450F128H-I/MR draws approximately 70 mA at full 80 MHz operation with USB active. Power supply design must use a low-noise 3.3V LDO (such as Microchip MCP1700) with at least 100 mA headroom. Place a 100 nF decoupling capacitor within 3 mm of every VDD/VSS pair, plus a 4.7 uF bulk capacitor on the main supply rail. The VUSB pin requires its own 100 nF decoupling capacitor per Microchip datasheet recommendations for stable USB transceiver operation.
Estimated: The 64-pin VQFN (MR) package has a 9x9 mm footprint with an exposed thermal pad on the underside that MUST be soldered to a ground plane for thermal dissipation and electrical performance. PCB design should allocate at least 16 thermal vias (0.3 mm drill, 0.6 mm pad) connecting the EP to internal ground planes. USB D+/D- traces should be 90 ohm differential, length-matched, and kept under 50 mm to meet USB 2.0 Full-Speed signal integrity requirements per USB IF specifications.
Estimated: A common pitfall is omitting the VUSB decoupling capacitor or failing to populate the exposed thermal pad solder paste stencil - both result in USB enumeration failures or thermal shutdown at high CPU loads. The PICkit 3 / ICD 3 programmer interface uses pins RB5 (PGED1) and RB6 (PGEC1), which must not be reassigned via Peripheral Pin Select if ICSP debugging is required. Also, ensure the 3.3V supply rises monotonically; if not, the internal brown-out reset may lock the part in reset state requiring a power cycle.
Estimated: Crystal oscillator traces (OSC1/OSC2) should be kept short and surrounded by ground guard traces to minimize EMI pickup. The 8 MHz primary oscillator with PLL can drive the MCU to 80 MHz, so PLL configuration in firmware must match the actual crystal frequency - a common bug is assuming 10 MHz crystal when 8 MHz is installed, resulting in a 25% clock error. Use Peripheral Pin Select (PPS) to remap digital peripherals to convenient GPIO pins, but ensure no two peripherals are assigned to the same pin.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified - use PIC32 variants with /VAO suffix for automotive applications.
