PIC32MX450F256H-120/MR - 120MHz 32-bit MCU, 256KB Flash | Microchip
MPN： PIC32MX450F256H-120/MR ✓ 啟用中PIC32MX450F256H-120/MR 概覽
What is a PIC32 microcontroller? The PIC32MX family is Microchip's 32-bit extension of the legacy 16-bit PIC24/dsPIC architecture, based on the MIPS32 M4K core. It sits in the hierarchy 32-bit MCU -> microcontroller -> embedded processor -> semiconductor. PIC32MX parts are widely used in audio/graphics/touch human-machine interface (HMI) applications, USB peripherals, and mixed-signal embedded designs that require more processing headroom than 8/16-bit PIC MCUs while retaining the MPLAB X toolchain.
Key differentiating features include the 120 MHz core frequency (vs 80 MHz on lower-numbered PIC32MX3/4 variants), 256 KB Flash with pre-fetch cache for zero-wait-state execution, and a flexible DMA engine that offloads ADC and SPI transactions. The device supports an industrial-grade temperature range and operates from 2.3 V to 3.6 V. Five 16-bit timers/captures, five input-capture and five output-compare/PWM channels give substantial timing flexibility for motor control and power conversion.
Typical applications include USB audio interfaces, capacitive-touch HMI panels, industrial control boards with USB device/host stacks, graphics-enabled display controllers, and embedded data loggers. The integrated USB OTG controller eliminates the need for an external transceiver in low-cost designs.
When designing with this MCU, allocate 4 KB of Flash for the bootloader and reserve a contiguous SRAM region for USB endpoint buffers. Decouple VDD with 100 nF X7R at each pin pair and add a 10 uF bulk capacitor near the VCORE/VCAP pin. Keep the 48 MHz USB clock trace short to avoid EMI.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical layout guidance not collected in any single vendor datasheet, helping engineers and procurement teams evaluate the PIC32MX450F256H-120/MR quickly.
直接替換替代品，適用於 PIC32MX450F256H-120/MR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC32MX450F256H-120/MR （相同外形與佔位） — 差異在於 Package, ADC, MSL Level, USB, Operating Temperature.
PIC32MX450F256HT-120/MR
✅ 直接替換聯絡詢價
查看資料表 →PIC32MX450F256H-120I/MR
✅ 直接替換📋 參考替代品（不在目錄中）
PIC32MX470F256H-120/MR
✅ 直接替換📋 參考替代品（不在目錄中）
PIC32MX450F128H-I/MR
✅ 直接替換聯絡詢價
查看資料表 →PIC32MX440F256H-80I/MR
✅ 直接替換聯絡詢價
查看資料表 →PIC32MX350F256HT-I/MR
✅ 直接替換聯絡詢價
查看資料表 →PIC32MX450F256H-120/MR 最大額定值與電氣特性
| Core Architecture | MIPS32 M4K (PIC32MX) |
| Maximum CPU Frequency | 120 MHz |
| DMIPS Performance | 150 DMIPS |
| Program Memory (Flash) | 256 KB (256K x 8) |
| Data Memory (SRAM) | 64 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| I/O Pins | 49 |
| DMA Channels | 6 |
| USB Controller | USB 2.0 Full-Speed Device/Host/OTG |
| SPI / I2S Interfaces | 2 |
| I2C Interfaces | 2 |
| UART Interfaces | 5 |
| ADC | 10-bit, 16 channels, 1 Msps |
| Analog Comparators | 2 |
| Timers | 5 x 16-bit |
| Input Capture / Output Compare | 5 / 5 |
| PWM Channels | 5 |
| 封裝 | 64-pin QFN (9x9 mm), MR suffix |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40 C to +85 C (industrial) |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
PIC32MX450F256H-120/MR 腳位配置
| 腳位 1 | RB0 — Port B bit 0 (PGED1/AN0) |
| 腳位 2 | RB1 — Port B bit 1 (PGEC1/AN1) |
| 腳位 3 | RB2 — Port B bit 2 (AN2) |
| 腳位 4 | RB3 — Port B bit 3 (AN3) |
| 腳位 5 | RB4 — Port B bit 4 (AN4) |
| 腳位 6 | RB5 — Port B bit 5 (AN5) |
| 腳位 7 | RB6 — Port B bit 6 (AN6/OC1) |
| 腳位 8 | RB7 — Port B bit 7 (AN7/OC2) |
| 腳位 9 | RB8 — Port B bit 8 (AN8/OC3) |
| 腳位 10 | RB9 — Port B bit 9 (AN9/OC4) |
| 腳位 11 | VDD — Core/IO supply (3.3 V nominal) |
| 腳位 12 | VSS — Ground reference |
| 腳位 13 | RC1 — Port C bit 1 (T2CK) |
| 腳位 14 | RC2 — Port C bit 2 (T3CK) |
| 腳位 15 | RC3 — Port C bit 3 (T4CK) |
| 腳位 16 | RC4 — Port C bit 4 (T5CK) |
| 腳位 17 | RD0 — Port D bit 0 (OC1) |
| 腳位 18 | RD1 — Port D bit 1 (OC2) |
| 腳位 19 | RD2 — Port D bit 2 (OC3) |
| 腳位 20 | RD3 — Port D bit 3 (OC4) |
| 腳位 21 | RD4 — Port D bit 4 (OC5) |
| 腳位 22 | RD5 — Port D bit 5 |
| 腳位 23 | RD6 — Port D bit 6 |
| 腳位 24 | RD7 — Port D bit 7 |
| 腳位 25 | RC14 — Port C bit 14 |
| 腳位 26 | RC15 — Port C bit 15 |
| 腳位 27 | RC13 — Port C bit 13 |
| 腳位 28 | RD8 — Port D bit 8 (IC1) |
| 腳位 29 | RD9 — Port D bit 9 (IC2) |
| 腳位 30 | RD10 — Port D bit 10 (IC3) |
| 腳位 31 | RD11 — Port D bit 11 (IC4) |
| 腳位 32 | VDD — Core/IO supply (3.3 V nominal) |
| 腳位 33 | VSS — Ground reference |
| 腳位 34 | RB10 — Port B bit 10 (CVREF) |
| 腳位 35 | RB11 — Port B bit 11 (AN11) |
| 腳位 36 | RB12 — Port B bit 12 (AN12) |
| 腳位 37 | RB13 — Port B bit 13 (AN13) |
| 腳位 38 | RB14 — Port B bit 14 (AN14) |
| 腳位 39 | RB15 — Port B bit 15 (AN15) |
| 腳位 40 | RF0 — Port F bit 0 (C1OUT) |
| 腳位 41 | RF1 — Port F bit 1 (C2OUT) |
| 腳位 42 | RF2 — Port F bit 2 (U2RX) |
| 腳位 43 | RF3 — Port F bit 3 (U2TX) |
| 腳位 44 | RF4 — Port F bit 4 (U3RX) |
| 腳位 45 | RF5 — Port F bit 5 (U3TX) |
| 腳位 46 | RF6 — Port F bit 6 (U4RX) |
| 腳位 47 | RF7 — Port F bit 7 (U4TX) |
| 腳位 48 | RG6 — Port G bit 6 (SCLK1) |
| 腳位 49 | RG7 — Port G bit 7 (SDA1) |
| 腳位 50 | RG8 — Port G bit 8 (SCL1) |
| 腳位 51 | RG9 — Port G bit 9 (SS1) |
| 腳位 52 | RA0 — Port A bit 0 (TMS) |
| 腳位 53 | RA1 — Port A bit 1 (TCK) |
| 腳位 54 | RA2 — Port A bit 2 (TDI) |
| 腳位 55 | RA3 — Port A bit 3 (TDO) |
| 腳位 56 | RA4 — Port A bit 4 (SOSCO) |
| 腳位 57 | RA5 — Port A bit 5 (SOSCI) |
| 腳位 58 | RD12 — Port D bit 12 (IC5) |
| 腳位 59 | RD13 — Port D bit 13 |
| 腳位 60 | RD14 — Port D bit 14 |
| 腳位 61 | RD15 — Port D bit 15 |
| 腳位 62 | RC12 — Port C bit 12 |
| 腳位 63 | RC11 — Port C bit 11 |
| 腳位 64 | RF8 — Port F bit 8 (U5RX) |
典型應用
PIC32MX450F256H-120/MR 適用於 7 應用s: USB Audio Class Interfaces, Capacitive Touch HMI Panels, Industrial USB Data Loggers, USB Barcode Scanner Modules, Smart Home Sensor Hubs, USB-Powered Graphics Displays, Educational and Development Platforms.
USB Audio Class Interfaces
The PIC32MX450F256H-120/MR's integrated USB 2.0 full-speed OTG controller plus dual I2S ports makes it a single-chip solution for USB audio class 1.0 interfaces operating at 24-bit/48 kHz. The 120 MHz MIPS32 M4K core provides 150 DMIPS, leaving roughly 40 MIPS headroom after USB polling, I2S DMA streaming, and a basic biquad filter chain. Engineers reference the MLA USB Audio Device example and run I2S as a slave to an external DAC such as the PCM5102A. With 64 KB SRAM, two stereo DMA ping-pong buffers (4 KB total) plus USB endpoint memory fit comfortably, leaving room for a bootloader. Compared to 8/16-bit PIC MCUs, the 32-bit core eliminates ISR jitter that would otherwise distort USB audio packets.
推薦
Capacitive Touch HMI Panels
With 49 I/O pins, the PIC32MX450F256H-120/MR can drive up to 49 capacitive-touch sensors via the on-chip Charge Time Measurement Unit (CTMU) and 16-channel 10-bit ADC. The 120 MHz core samples touch channels at 1 Msps aggregate, enabling smooth 100 Hz refresh of 16+ buttons with 1 ms latency per scan. Designers typically use the Microchip mTouch library, which scans via DMA-triggered ADC conversions and processes raw counts in the foreground loop. The 256 KB Flash fits the mTouch library, USB HID stack, and a custom LCD graphics layer; 64 KB SRAM supports frame buffers for small 128x64 graphical displays.
推薦
Industrial USB Data Loggers
The PIC32MX450F256H-120/MR's 120 MHz core and 6-channel DMA engine allow continuous streaming from the 16-channel 10-bit ADC to USB mass storage or USB CDC serial without CPU intervention. The DMA engine offloads ADC-to-SRAM transfers at up to 1 Msps aggregate, freeing the CPU for CSV formatting and FAT32 file system maintenance. With 256 KB Flash, designers can run Microchip's MLA USB MSD host stack plus a small RTOS kernel. Industrial users should select the -120I/MR temperature grade variant to guarantee -40 C to +85 C operation in factory-floor environments with electrical noise and temperature swings.
推薦
USB Barcode Scanner Modules
Handheld barcode scanners need fast image processing plus USB HID keyboard or CDC-ACM output, both of which the PIC32MX450F256H-120/MR delivers via the on-chip USB OTG controller. The 120 MHz MIPS32 M4K core runs decoding firmware (Code 39, QR, Data Matrix) at 30+ fps from a 640x480 CMOS sensor through the parallel interface or SPI. 64 KB SRAM holds one decoded frame plus descriptor tables; 256 KB Flash accommodates firmware updates via the USB bootloader. The integrated 5 UARTs allow legacy RS-232 scanner wedges if the host does not support USB.
推薦
Smart Home Sensor Hubs
The PIC32MX450F256H-120/MR is well-suited for low-power smart-home gateways that aggregate Zigbee or sub-GHz sensor data via UART/SPI and forward it over USB or Wi-Fi. The 120 MHz core manages concurrent DMA-driven UART reception from multiple sensor modems while running an MQTT-over-USB or TLS tunnel to a host processor. With 2.3 V to 3.6 V operation, the device can share a coin-cell boost rail. Designers typically pair the PIC32MX450 with an ESP32 Wi-Fi co-processor, using UART1 for AT command exchange and DMA on UART2 for sensor data bursts. The on-chip 10-bit ADC also reads battery voltage and ambient light.
推薦
USB-Powered Graphics Displays
The PIC32MX450F256H-120/MR's 120 MHz core drives 128x64 or 240x160 color TFTs via SPI/I2S, while USB bus-power keeps the BOM minimal. The 6-channel DMA engine continuously refills the SPI display buffer without CPU involvement, and the on-chip USB CDC device class allows the host PC to send display content as virtual COM port commands. Compared to 80 MHz PIC32MX440 parts, the 120 MHz speed grade leaves extra headroom for anti-aliased fonts and PNG decode. The 64-QFN package includes an exposed thermal pad to dissipate the small heat generated by the core at full load.
推薦
Educational and Development Platforms
Academic labs and hobbyists use the PIC32MX450F256H-120/MR in development boards and Maker projects because of its mature toolchain (MPLAB X IDE, XC32 compiler, Harmony 3 framework) and broad peripheral set. The 120 MHz core provides enough performance for embedded Linux porting exercises, FreeRTOS porting, and real-time DSP coursework. The 256 KB Flash is large enough for student projects using TCP/IP stacks, USB stacks, and file systems concurrently. The part's 64-QFN package is breadboard-friendly via breakout boards, and its 49 I/O pins support the usual mix of LEDs, buttons, character LCDs, and sensors used in coursework.
推薦
推薦產品摘要
工程參考資料，適用於 PIC32MX450F256H-120/MR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC32MX450F256HT-120/MR | PIC32MX450F256H-120I/MR | PIC32MX470F256H-120/MR | PIC32MX450F128H-I/MR | PIC32MX440F256H-80I/MR | PIC32MX350F256HT-I/MR |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | 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 | 64-QFN (9x9 mm) - same |
| CPU Frequency | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 80 MHz | 80 MHz |
| Flash | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB | 256 KB | 256 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB | 64 KB | 64 KB |
| USB Controller | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG + CAN | USB 2.0 FS OTG | USB 2.0 FS OTG | No USB |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| DMA Channels | 6 | 6 | 6 | 8 | 6 | 6 | 6 |
主要差異化特點
- 120 MHz core with 256 KB Flash in 64-QFN (對比PIC32MX440F256H-80I/MR)
- Integrated USB 2.0 OTG vs no USB on PIC32MX350 (對比PIC32MX350F256HT-I/MR)
- Same 64-QFN footprint, double the Flash vs PIC32MX330 (對比PIC32MX330F064H-I/MR)
- 6-channel DMA engine vs 4-channel on PIC32MX250 (對比PIC32MX250F128B-I/SP)
設計說明
Place a 10 uF ceramic + 100 nF X7R bypass pair adjacent to each VDD/VSS pin pair (pins 11/12 and 32/33 on the 64-QFN). The PIC32MX450 internal regulator draws short transient currents during Flash programming; insufficient bulk capacitance causes Vcore droop and resets. Keep the trace length from the VCAP pin to the capacitor below 5 mm. For USB-bus-powered designs, add 4.7 uF on VBUS before the local 3.3 V LDO to avoid brown-out during host enumeration.
Solder the exposed thermal pad (EP) of the 64-QFN package to a continuous ground pour with at least 8 thermal vias to inner ground layers. Without proper EP soldering, the junction-to-ambient thermal resistance rises and the part derates below 100 MHz at high ambient temperatures. Maintain 0.2 mm clearance between QFN pads and adjacent signal traces, and use 4-mil trace-and-space for fine-pitch fanout from the package perimeter.
Keep the 48 MHz USB crystal oscillator trace length below 5 mm and surround it with a ground guard ring. Route D+ and D+ as a 90 ohm differential pair with no other signals within 3W (0.6 mm at 4-mil trace width). Place the USB series ferrite bead and ESD protection diode within 10 mm of the connector. Avoid routing USB traces parallel to high-current switching signals to prevent radiated EMI re-injection.
Do not program the internal 8 MHz RC oscillator as the USB clock source - USB full-speed requires 48 MHz +/- 0.25% accuracy, so always configure a 12 MHz or 24 MHz primary crystal with the on-chip PLL set to 4x or 2x. Forgetting to enable the JTAG pins as digital I/O when JTAG is unused (via CFGCONbits.JTAGEN) locks those pins permanently and reduces the available GPIO count from 49 to 45.
When routing SPI to an external TFT or SD card, place a 22-33 ohm series damping resistor at the MCU SCLK pin to limit ringing on long (>50 mm) traces. For I2S audio, ensure the MCLK, BCLK, and LRCK traces are matched within 5 mm and isolated from digital switching nodes. If I2C pull-ups are used (typical 2.2 k-ohm to 3.3 V), place them near the MCU SDA/SCL pins, not near the peripheral, to suppress ringing on the rising edge.
合規資訊
RoHS-compliant and lead-free per Microchip product page and DigiKey listing. Not AEC-Q100 qualified - select PIC32MX auto-grade variants for automotive applications. Halogen-free status not explicitly stated in verified data.
