PIC32MX450F256HT-I/MR - 80MHz 32-bit MCU 256KB Flash 64-QFN
MPN: PIC32MX450F256HT-I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.88 | $6.88 |
| 10 | $6.18 | $61.80 |
| 100 | $5.3 | $530.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.2 | $4,200.00 |
PIC32MX450F256HT-I/MR Overview
A 32-bit microcontroller (MCU) is a single-chip processor that integrates a CPU core, program memory (Flash), data memory (SRAM), and a broad set of peripherals on one die. Within the broader taxonomy of microcontrollers, the PIC32MX450 sits at the high-performance end of Microchip's PIC32 family: microcontroller -> 32-bit MCU -> MIPS-based MCU -> PIC32MX family -> PIC32MX3/4 sub-family. This positioning means the device competes with entry-level ARM Cortex-M3 MCUs in cost while offering Microchip's MPLAB X toolchain and Harmony ecosystem.
Key features include 49 usable I/O, five 16-bit timers, a 16-bit Parallel Master Port, a 10-bit 1 Msps ADC with up to 28 channels, two analog comparators, and a CTMU for capacitive touch. The 64-QFN exposed pad enables efficient PCB thermal dissipation at sustained loads, while the 3.0-3.6 V single-supply operation simplifies power tree design in battery and USB-powered designs.
The architecture pairs a MIPS32 M4K core with a multi-vectored interrupt controller and a 5-stage pipeline, achieving 1.56 DMIPS/MHz or up to 125 DMIPS at 80 MHz. The device includes a 10-bit 1 Msps ADC and 16-bit PMP, enabling integrated graphics or external memory interfacing without external logic, which reduces BOM cost.
Typical applications include consumer audio appliances, low-cost HMI panels with PMP-driven LCDs, industrial sensor hubs, USB device/host controllers, and low-cost 32-bit replacement for PIC24 designs. The wide peripheral set also supports Bluetooth/BLE control hosts using the SPI/I2S bridges and PMP-connected displays.
When designing with this part, ensure the exposed pad is soldered to a sufficiently large copper pour for thermal performance and ground integrity. The 'I' suffix denotes the -40C to +85C industrial temperature grade, while the 'H' indicates 64-pin QFN with internal trace Flash; verify boot configuration and PPS mapping in MPLAB X to avoid pin conflicts.
This page synthesizes distributor pricing, drop-in alternatives within the same 64-QFN footprint, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC32MX450F256HT-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 PIC32MX450F256HT-I/MR (same form factor and footprint) — differing in Package, ADC, Timers, Operating Temperature, DMA Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX450F256HT-120/MR
✅ Drop-In✓ In Stock
$3.27 / Unit
View Datasheet →PIC32MX450F256H-120/MR
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC32MX350F256HT-I/MR
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →PIC32MX450F128HT-I/MR
✅ Drop-In✓ In Stock
$2.81 / Unit
View Datasheet →PIC32MX440F256HT-80I/MR
✅ Drop-In✓ In Stock
$4.61 / Unit
View Datasheet →PIC32MX450F256HT-I/MR Maximum Ratings & Electrical Characteristics
| Core Processor | MIPS32 M4K |
| Core Size | 32-Bit Single-Core |
| Maximum Clock Speed | 80 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM Size | 64 KB |
| Number of I/O | 49 |
| Supply Voltage | 2.3 V to 3.6 V |
| ADC | 10-bit, 1 Msps, up to 28 channels |
| Analog Comparators | 2 |
| UART | 2 |
| SPI / I2S | 2 |
| I2C | 2 |
| Parallel Master Port (PMP) | 8-bit |
| Timers | 5 x 16-bit |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 64-QFN (9x9 mm) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC32MX450F256HT-I/MR Pin Configuration
| Pin 1 | RPB15/AN15/PMPDH/PMCS1 — GPIO RB15, ADC ch15, PMP data high, chip select 1 |
| Pin 2 | RPB14/AN14/PMPDO/PMCS2 — GPIO RB14, ADC ch14, PMP data out, chip select 2 |
| Pin 3 | RPB13/AN13/RPG6/RPG7 — GPIO RB13, ADC ch13, remappable peripheral |
| Pin 4 | RPB12/AN12 — GPIO RB12, ADC ch12 |
| Pin 5 | RPB11/AN11 — GPIO RB11, ADC ch11 |
| Pin 6 | RPB10/AN10/CVREFOUT — GPIO RB10, ADC ch10, CVREF output |
| Pin 7 | RPB9/AN9/C1INB/C2INB/C3INB — GPIO RB9, ADC ch9, comparator negative input |
| Pin 8 | RPB8/AN8/C1INA/C2INA/C3INA — GPIO RB8, ADC ch8, comparator positive input |
| Pin 9 | RPB7/AN7 — GPIO RB7, ADC ch7 |
| Pin 10 | RPB6/AN6 — GPIO RB6, ADC ch6 |
| Pin 11 | VDD — Digital power supply (3.3V nominal) |
| Pin 12 | VSS — Digital ground |
| Pin 13 | RPB5/AN5/C1IND/C2IND/C3IND — GPIO RB5, ADC ch5, comparator negative input |
| Pin 14 | RPB4/AN4/C1INC/C2INC/C3INC — GPIO RB4, ADC ch4, comparator negative input |
| Pin 15 | RPB3/AN3/C2INA — GPIO RB3, ADC ch3, comparator input |
| Pin 16 | RPB2/AN2/C2INB — GPIO RB2, ADC ch2, comparator input |
| Pin 17 | RPB1/AN1/C1INA/C2INA/C3INA — GPIO RB1, ADC ch1, comparator input |
| Pin 18 | RPB0/AN0/C1INB/C2INB/C3INB — GPIO RB0, ADC ch0, comparator input |
| Pin 19 | AVDD — Analog power supply |
| Pin 20 | AVSS — Analog ground |
| Pin 21 | RPA15/AN27 — GPIO RA15, ADC ch27 |
| Pin 22 | RPA14/AN26 — GPIO RA14, ADC ch26 |
| Pin 23 | RPA13/AN25 — GPIO RA13, ADC ch25 |
| Pin 24 | RPA12/AN24 — GPIO RA12, ADC ch24 |
| Pin 25 | RPA11/AN23 — GPIO RA11, ADC ch23 |
| Pin 26 | RPA10/AN22 — GPIO RA10, ADC ch22 |
| Pin 27 | RPA9/AN21 — GPIO RA9, ADC ch21 |
| Pin 28 | VDD — Digital power supply |
| Pin 29 | VSS — Digital ground |
| Pin 30 | RPC15/AN20 — GPIO RC15, ADC ch20 |
| Pin 31 | RPC14/AN19 — GPIO RC14, ADC ch19 |
| Pin 32 | RPC13/AN18 — GPIO RC13, ADC ch18 |
| Pin 33 | RPC12/AN17 — GPIO RC12, ADC ch17 |
| Pin 34 | RPC11/AN16 — GPIO RC11, ADC ch16 |
| Pin 35 | RPC10/AN28 — GPIO RC10, ADC ch28 |
| Pin 36 | RPC9 — GPIO RC9 |
| Pin 37 | RPC8 — GPIO RC8 |
| Pin 38 | RPC7 — GPIO RC7 |
| Pin 39 | RPC6 — GPIO RC6 |
| Pin 40 | RPC5 — GPIO RC5 |
| Pin 41 | RPC4 — GPIO RC4 |
| Pin 42 | RPC3 — GPIO RC3 |
| Pin 43 | RPC2 — GPIO RC2 |
| Pin 44 | RPC1 — GPIO RC1 |
| Pin 45 | RPC0 — GPIO RC0 |
| Pin 46 | RPD15/PMPRD/SDO2/SDI1 — GPIO RD15, PMP read strobe, SPI data |
| Pin 47 | RPD14/PMPA0/SS1 — GPIO RD14, PMP address 0, SPI slave select |
| Pin 48 | RPD13/PMPA1 — GPIO RD13, PMP address 1 |
| Pin 49 | RPD12/PMPA2 — GPIO RD12, PMP address 2 |
| Pin 50 | RPD11/PMPA3/SDI2 — GPIO RD11, PMP address 3, SPI data in |
| Pin 51 | RPD10/PMPA4/SCK2 — GPIO RD10, PMP address 4, SPI clock |
| Pin 52 | RPD9/PMPA5 — GPIO RD9, PMP address 5 |
| Pin 53 | RPD8/PMPA6 — GPIO RD8, PMP address 6 |
| Pin 54 | RPD7/PMPA7/SS2 — GPIO RD7, PMP address 7, SPI slave select 2 |
| Pin 55 | RPD6/PMPA8 — GPIO RD6, PMP address 8 |
| Pin 56 | VDD — Digital power supply |
| Pin 57 | VSS — Digital ground |
| Pin 58 | RPD5/PMPA9 — GPIO RD5, PMP address 9 |
| Pin 59 | RPD4/PMPA10 — GPIO RD4, PMP address 10 |
| Pin 60 | RPD3/PMPA11 — GPIO RD3, PMP address 11 |
| Pin 61 | RPD2/PMPA12 — GPIO RD2, PMP address 12 |
| Pin 62 | RPD1/PMPA13 — GPIO RD1, PMP address 13 |
| Pin 63 | RPD0/PMPA14 — GPIO RD0, PMP address 14 |
| Pin 64 | OSC1/CLKI/RC15 — Crystal oscillator input / external clock input |
| Pin 65 | EP — Exposed thermal pad - connect to ground plane |
Typical Applications
PIC32MX450F256HT-I/MR is suitable for 6 applications: Consumer Audio Appliance, HMI Panel with PMP-Driven LCD, Industrial Sensor Hub, USB Device/Host Controller, Low-Cost 32-bit Replacement for PIC24, BLE Host with SPI-Connected Module.
Consumer Audio Appliance
Drives MP3/AAC decoding and audio routing in sound bars, headphones, and Bluetooth speakers. The PIC32MX450F256HT-I/MR's 80 MHz MIPS M4K core and dual SPI/I2S interfaces provide sufficient bandwidth for stereo 48 kHz / 24-bit audio streams, while 256 KB Flash accommodates MP3/AAC decoder tables and UI state machines. Pair with an external audio DAC like the TI PCM5101A via I2S for full Hi-Fi playback; the integrated 10-bit ADC handles auxiliary analog inputs such as microphone preamps or rotary encoder voltage dividers without an external ADC. This architecture eliminates the need for a separate audio processor, reducing BOM cost and PCB footprint for cost-sensitive consumer audio products.
Recommended
HMI Panel with PMP-Driven LCD
Renders text and graphics on character or dot-matrix LCDs via the integrated 8-bit Parallel Master Port (PMP). The PIC32MX450F256HT-I/MR drives ST7066U-based character LCDs directly through PMP, eliminating external display controllers, while its 64 KB SRAM provides buffer space for full-screen framebuffers on smaller graphic LCDs. Industrial -40C to +85C operation enables deployment in appliances and equipment panels, and the 256 KB Flash stores multilingual font tables and UI state machines. Combined with the 10-bit ADC for touch or rotary inputs, this creates a complete HMI solution with minimal external components, ideal for HVAC controls, vending machines, and IoT gateways.
Recommended
Industrial Sensor Hub
Aggregates analog and digital sensors in factory automation and process control installations. The PIC32MX450F256HT-I/MR integrates a 10-bit 1 Msps ADC with 28 channels for direct connection to thermocouples, RTDs, and 4-20 mA loop sensors via signal conditioning, while dual SPI/I2S ports connect to digital accelerometers and environmental sensors. The -40C to +85C industrial temperature rating ensures reliability on factory floors, and the 256 KB Flash accommodates Modbus RTU and proprietary protocol stacks. Hardware CTMU enables capacitive touch or liquid level sensing without an external touch IC, reducing BOM cost in distributed sensor installations.
Recommended
USB Device/Host Controller
Implements USB device or host controllers using the PIC32MX's integrated USB 2.0 full-speed OTG peripheral. The PIC32MX450F256HT-I/MR's 80 MHz MIPS M4K core and 64 KB SRAM handle USB stack and class driver firmware with sufficient headroom for HID, CDC, MSD, and vendor classes. The two UART bridges provide serial-to-USB conversion in industrial gateways, and the 256 KB Flash stores USB stack plus application logic. Drop-in compatibility with the 120 MHz variant allows easy upgrade for designs requiring higher USB throughput or concurrent protocol processing.
Recommended
Low-Cost 32-bit Replacement for PIC24
Provides a migration path for designs currently using 16-bit PIC24 microcontrollers that need more memory and MIPS. The PIC32MX450F256HT-I/MR offers 256 KB Flash (vs 128 KB typical in PIC24), 64 KB RAM, and 32-bit performance at comparable cost, while remaining compatible with Microchip's MPLAB X IDE and Harmony framework. The two I2C, two SPI/I2S, and two UART preserve existing peripheral connections, easing firmware porting. This makes it ideal for upgrading PIC24FJ designs without PCB changes, especially in industrial control, motor drive, and consumer product designs.
Recommended
BLE Host with SPI-Connected Module
Acts as an application host MCU for Bluetooth/BLE modules connected over SPI or UART. The PIC32MX450F256HT-I/MR's dual SPI/I2S interfaces connect directly to modules like the RN4870 or CC2564 for BLE audio and data transfer, while the 256 KB Flash supports BLE GATT profiles and application logic. The 64 KB SRAM provides buffer space for sensor data aggregation before BLE transmission, and the two UART enable concurrent BLE HCI and debug logging. Industrial temperature grade ensures reliable operation in wearables, smart home sensors, and asset tracking devices.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX450F256HT-I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX450F256HT-120/MR | PIC32MX450F256H-120/MR | PIC32MX350F256HT-I/MR | PIC32MX450F128HT-I/MR | PIC32MX440F256HT-80I/MR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Maximum Clock Speed | 80 MHz | 120 MHz | 120 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB | 256 KB |
| RAM Size | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB | 64 KB |
| Number of I/O | 49 | 49 | 49 | 49 | 49 | 49 |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Supply 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 |
| Sub-Family | PIC32MX4 (USB OTG) | PIC32MX4 (USB OTG) | PIC32MX4 (USB OTG) | PIC32MX3 (no USB) | PIC32MX4 (USB OTG) | PIC32MX4 (USB OTG) |
Key Differentiators
- Highest-performance 80 MHz PIC32MX4 in 64-QFN (vs PIC32MX350F256HT-I/MR)
- Direct 120 MHz upgrade path in identical footprint (vs PIC32MX450F256HT-120/MR)
- 8-bit Parallel Master Port for direct LCD/FPGA interface (vs PIC32MX440F256HT-80I/MR)
Design Notes
The 64-QFN package's exposed thermal pad (pin 65) must be soldered to a continuous ground copper pour of at least 100 mm^2 on the top or inner PCB layer to meet -40C to +85C specifications. Per Microchip's packaging guidelines, the EP should connect via multiple thermal vias (4-8 vias, 0.3 mm drill) to internal ground planes for optimal heat dissipation. Without proper EP soldering, junction temperature can rise above 100C at full 80 MHz operation with sustained GPIO toggling, reducing long-term reliability.
Place 100 nF decoupling capacitors as close as possible to each VDD/VSS pin pair (pins 11/12, 28/29, 56/57) and a single 10 uF bulk capacitor near the supply entry point. Add a separate 100 nF + 10 uF pair on AVDD/AVSS (pins 19/20) to isolate analog reference noise from the digital rails. Keep analog traces (ADC inputs, comparator inputs) away from high-frequency digital lines and clock traces to minimize coupling; route ADC signals over a continuous ground pour for shielding.
Do not exceed 3.6 V on any VDD or AVDD pin - permanent damage will occur above 4.0 V. The 'I' suffix indicates industrial -40C to +85C; do not substitute a 'V' (extended -40C to +105C) or 'E' (automotive) variant without verifying your thermal design. Configure unused I/O as outputs (not inputs) to avoid floating-pin leakage, and enable the JTAG port's internal pull-ups if you disconnect the debugger, or configure the JTAG pins as GPIO via the DEVCFG0 fuse to free up the four dedicated pins.
The PIC32MX450F256HT-I/MR's 80 MHz system clock produces harmonics up to 240 MHz (3rd harmonic). Place the crystal (typically 8 MHz or 10 MHz fundamental) within 10 mm of OSC1/OSC2 (pin 64 area) and route clock traces over a continuous ground pour with no splits. For designs with 80 MHz core and 10/100 Ethernet, add a 33 ohm series termination at the clock driver to dampen reflections; consult the PIC32MX3/4 family datasheet section 32 for oscillator design.
Estimated: For USB OTG designs using the PIC32MX450F256HT-I/MR, route the D+/D- traces as a 90-ohm differential pair with continuous ground reference on both sides, keeping length matching to within 150 mil. Place the 27 ohm series termination resistors within 2 mm of the MCU's USB pins. Use Microchip's AN1166 layout guidelines as reference; proper USB trace impedance is critical for USB compliance testing and signal integrity.
Compliance Information
RoHS and REACH compliant per Microchip product documentation. Not AEC-Q100 qualified; for automotive applications use PIC32MX variants with explicit automotive grade designation.
