PIC32MX450F128H-I/RG - 32-bit MCU, 128KB Flash, USB-OTG | Microchip
MPN: PIC32MX450F128H-I/RG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.32 | $5.32 |
| 10 | $4.78 | $47.80 |
| 100 | $4.2 | $420.00 |
| 500 | $3.65 | $1,825.00 |
| 1,000 | $3.18 | $3,180.00 |
| 3,000 | $2.79 | $8,370.00 |
PIC32MX450F128H-I/RG Overview
A 32-bit microcontroller (MCU) is a single-chip computer whose central processing unit has a 32-bit data path, 32-bit registers, and a 32-bit address bus. The PIC32MX family sits in the PIC (Peripheral Interface Controller) lineage from Microchip, which evolved from 8-bit and 16-bit cores into a MIPS-derived 32-bit architecture. Within the broader taxonomy, the PIC32MX450F128H belongs to microcontrollers -> embedded processors -> RISC microcontrollers -> 32-bit microcontrollers -> semiconductor ICs.
Key on-chip resources include a Full-Speed USB 2.0 On-The-Go (OTG) controller, two I2S/SPI modules for codec and serial audio, a Parallel Master Port (PMP) for graphics, Peripheral Pin Select (PPS) for flexible signal routing, a Charge Time Measurement Unit (CTMU), a 10-bit 1 Msps ADC with up to 28 channels, two analog comparators, two I2C peripherals, five 16-bit timers/counters, and standard 5V-tolerant GPIO on most pins. Code protection, JTAG/ICSP debugging, and a real-time clock calendar are also integrated.
Architecturally, the PIC32MX450F128H uses the Harvard-style MIPS M4K core with separate instruction and data buses, prefetch cache, and a tightly-coupled DMA-free peripheral set. The result is deterministic interrupt latency and competitive MIPS/mW figures for low-cost 32-bit designs. Prefetch and Flash cache accelerate the 128 KB Flash array, while the 16 KB SRAM supports RAM-intensive stacks, USB descriptors, and graphics framebuffers without external memory.
Typical applications include USB audio interfaces and USB HID/CDC devices, HMI panels with PMP-driven TFT or OLED displays, low-cost barcode scanners, home appliances with touch sensing via CTMU, industrial sensor hubs with CAN-ready bridges, IoT edge nodes using USB as the connectivity tether, and medical instrument front-ends. The integrated USB-OTG removes the need for an external PHY, lowering BOM cost on these designs.
When designing with this part, choose the variant speed code carefully: -I/RG is the 80 MHz industrial-grade version in 64-QFN. If your design needs more headroom, evaluate the PIC32MX450F256H (256 KB Flash) or PIC32MX470F512H (512 KB Flash), both in the same 64-QFN footprint for a near-drop-in upgrade. Decoupling must include 100 nF on every VDD/AVDD pair plus a bulk 4.7-10 uF to keep the USB PLL and core logic rails quiet.
This page synthesizes current distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond a single datasheet, helping engineers shortlist PIC32MX replacements without sacrificing USB-OTG, graphics, or audio features.
Drop-in alternatives for PIC32MX450F128H-I/RG — 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/RG (same form factor and footprint) — differing in Package, USB, Core Architecture, ADC, SPI / I2S.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX450F128H-I/MR
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC32MX450F128HT-I/RG
✅ Drop-In✓ In Stock
$4.15 / Unit
View Datasheet →PIC32MX450F256H-I/RG
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX470F512H-I/RG
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX450F128LT-I/RG
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX440F128H-I/RG
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX450F128H-I/RG Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K (PIC32MX3/4 family) |
| CPU | 32-bit RISC, single core |
| Max CPU Speed | 80 MHz (industrial variant, per distributor); 100 MHz/120 MHz family max |
| DMIPS | 131 DMIPS @ 100 MHz (family rating) |
| Program Flash | 128 KB (128K x 8) |
| Data SRAM | 16 KB |
| Operating Voltage (VDD) | 2.3 V to 3.6 V |
| Operating Temperature (I grade) | -40 C to +85 C |
| Package | 64-pin QFN (RG), 9 x 9 mm |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed On-The-Go (OTG) controller, integrated transceiver |
| ADC | 10-bit, up to 28 channels, 1 Msps |
| Analog Comparators | 2 |
| I2C | 2 modules |
| SPI / I2S | 2 SPI/I2S modules |
| Parallel Master Port (PMP) | Yes, for graphics interfaces |
| Peripheral Pin Select (PPS) | Yes |
| CTMU (Charge Time Measurement Unit) | Yes |
| Timers | 5 x 16-bit timer/counter |
| Debug | JTAG + ICSP (2-wire programming/debug) |
| RoHS Status | Compliant |
| MSL (Moisture Sensitivity Level) | 3 (per typical QFN handling) |
PIC32MX450F128H-I/RG 64-pin qfn (rg), 9 x 9 mm Pin Configuration Guide
Pin configuration for PIC32MX450F128H-I/RG (64-pin qfn (rg), 9 x 9 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC32MX450F128H-I/RG.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC32MX450F128H-I/RG is suitable for 6 applications: USB Audio Interface, HMI Panel with Graphics Display, USB Barcode Scanner, Touch-Sensing Appliance Control, Industrial Sensor Hub, Medical Instrument Front-End.
USB Audio Interface
The PIC32MX450F128H-I/RG fits USB audio designs because its integrated USB 2.0 Full-Speed On-The-Go controller pairs with two I2S/SPI modules, providing the exact peripheral set required for a USB Audio Class 1.0 device at 48 kHz/16-bit. Its 16 KB SRAM holds USB descriptors plus small audio buffers without external memory, and the 128 KB Flash accommodates the USB stack, audio pipeline, and DSP effects. The device runs from 2.3 V to 3.6 V, ideal for a 3.3 V single-rail design.
Recommended
HMI Panel with Graphics Display
The PIC32MX450F128H-I/RG drives HMI panels through its Parallel Master Port (PMP) interface and Peripheral Pin Select (PPS), connecting directly to TFT, OLED, and graphic LCDs in 8-bit or 16-bit modes. The 80 MHz core speed sustains SPI-based refresh of smaller displays while PMP handles full 16-bit parallel writes for 320x240 panels. Designers can choose this MCU for cost-sensitive industrial control panels where USB is also needed for firmware updates.
Recommended
USB Barcode Scanner
The PIC32MX450F128H-I/RG integrates USB-HID and CDC stacks while running image-processing and decoding firmware on its 32-bit M4K core. The 10-bit ADC with up to 28 channels digitizes sensor inputs, and the two I2C peripherals drive ambient-light sensors and laser aimers. With 128 KB Flash, designers can implement basic QR decoding libraries plus USB-HID keyboard-emulation firmware in a single chip, eliminating an external processor.
Recommended
Touch-Sensing Appliance Control
The PIC32MX450F128H-I/RG uses its integrated Charge Time Measurement Unit (CTMU) to implement capacitive touch sensing for appliance keypads without an external touch IC. The 28-channel ADC reads CTMU discharge curves, supporting 16+ touch buttons plus slider and wheel gestures. Operating from -40 C to +85 C, it tolerates kitchen and laundry environments, while the USB-OTG port enables service diagnostics and firmware updates.
Recommended
Industrial Sensor Hub
The PIC32MX450F128H-I/RG serves as a USB-connected sensor hub, reading analog sensors through its 10-bit ADC and digital sensors through I2C and SPI. The USB-OTG controller streams sensor data to a host PC or acts as a USB device for data logging. With 5 timers/counters, it can simultaneously trigger sampling, PWM outputs for control loops, and UART bridges to legacy RS-485 gear via an external transceiver.
Recommended
Medical Instrument Front-End
The PIC32MX450F128H-I/RG fits low-cost medical instrument front-ends because the USB-OTG controller streams digitized data to a host PC running analysis software, eliminating a dedicated display. The 10-bit ADC at 1 Msps samples ECG and pulse-oximeter signals with adequate resolution for screening-grade devices, and the CTMU drives precision resistive or capacitive sensor bridges. Industrial -40 C to +85 C temperature rating suits most clinical environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX450F128H-I/RG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX450F128H-I/MR | PIC32MX450F128HT-I/RG | PIC32MX450F256H-I/RG | PIC32MX470F512H-I/RG | PIC32MX450F128LT-I/RG | PIC32MX440F128H-I/RG |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin QFN (9x9 mm, RG) | 64-pin QFN (RG-family) | 64-pin QFN (9x9 mm, RG) - same | 64-pin QFN (9x9 mm, RG) - same | 64-pin QFN (9x9 mm, RG) - same | 64-pin QFN (9x9 mm, RG) - same | 64-pin QFN (9x9 mm, RG) - same |
| Core | MIPS32 M4K 32-bit | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| Max CPU Speed (I-grade) | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Program Flash | 128 KB | 128 KB | 128 KB | 256 KB | 512 KB | 128 KB | 128 KB |
| Data SRAM | 16 KB | 16 KB | 16 KB | 16 KB | 128 KB | 16 KB | 32 KB |
| USB-OTG | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Voltage | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V |
| Unit Price (qty 1) | USD 5.32 | USD 5.18 (typical) | USD 5.30 (typical) | USD 5.85 (typical) | USD 6.40 (typical) | USD 5.35 (typical) | USD 4.95 (typical) |
Key Differentiators
- Integrated USB-OTG with on-chip transceiver (vs PIC32MX370F512H-I/PT)
- Two I2S/SPI modules for audio (vs PIC32MX270F256D-I/PT)
- Lowest unit cost within the PIC32MX4 USB family (vs PIC32MX470F512H-I/RG)
Design Notes
Place a 100 nF ceramic decoupling capacitor on every VDD and AVDD pin pair, within 2 mm of the package pad. Add a single 4.7-10 uF bulk capacitor at the supply entry point. USB-OTG compliance requires VDD ripple below 50 mV peak-to-peak, so use a low-noise LDO (such as MCP1700) ahead of the PIC32MX450F128H-I/RG rather than feeding the MCU directly from a switching regulator.
The 64-pin QFN package has an exposed thermal pad that MUST be soldered to a continuous ground plane for both electrical grounding and thermal dissipation. Use an array of 9x9 thermal vias (0.3 mm drill, 0.6 mm pitch) under the e-pad to drop the junction-to-ambient thermal resistance. Without proper e-pad soldering, the part can overheat during sustained USB-OTG transfers at 80 MHz.
Do not exceed 3.6 V on any VDD pin; the PIC32MX450F128H-I/RG is NOT a 5V-tolerant core. If you interface 5V signals, use a level translator or resistive divider on inputs. Also note that the -I suffix designates industrial temperature (-40 C to +85 C); do not use this variant in extended-temperature designs - move to the V-suffix parts instead. The USB D+/D- traces must be 90 ohm differential with matching length, per USB 2.0 Full-Speed requirements.
Use Peripheral Pin Select (PPS) to remap peripheral functions onto convenient GPIO, but remap only what you need - keeping peripherals on default pins minimizes code complexity and improves timing margin. Place the 12 MHz or 8 MHz crystal within 5 mm of the OSC1/OSC2 pins with a guarded ground plane to avoid coupling noise into the USB PLL.
Compliance Information
RoHS compliant per Microchip product page. Industrial-grade (I-suffix) operating temperature -40 C to +85 C; not AEC-Q100 qualified. For automotive applications, evaluate the AEC-Q100 qualified PIC32MX variants in the same family. Lead-free matte-tin plating confirmed by Microchip product compliance documentation.
