PIC32MX274F256DT-I/PT - 32-bit MCU 256KB Flash USB 44-TQFP | Microchip
MPN： PIC32MX274F256DT-I/PT ✓ 啟用中PIC32MX274F256DT-I/PT 概覽
An MCU (microcontroller unit) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and a wide range of peripherals such as ADCs, timers, communication controllers, and GPIO. PIC32MX microcontrollers belong to the MIPS M4K-based PIC32 family and serve as a bridge between 8/16-bit PIC MCUs and 32-bit applications; in the broader taxonomy they sit under: microcontroller -> embedded processor -> integrated circuit -> semiconductor. The XLP (eXtreme Low Power) variants add deep sleep currents down to sub-micromand ultrasleep modes aimed at battery-powered products.
Key features include 256KB flash, 64KB SRAM, full-speed USB 2.0 with host/device/OTG modes, three 10-bit ADC modules (up to 1.1 Msps combined), three analog comparators with programmable hysteresis, four DMA channels, RTCC with calendar mode, CTMU for capacitive touch and time-of-flight measurements, and multiple serial interfaces: two I2C, two SPI, and two UART. The part also exposes up to 35 general-purpose I/Os in the 44-TQFP package with 5V-tolerant inputs on most signals.
Architecturally, the device pairs the MIPS32 M4K core with a 7-stage pipeline, hardware multiply/divide, single-cycle MAC, and tightly-coupled prefetch module for deterministic flash access. The USB peripheral includes an integrated transceiver and pull-up/pull-down resistors, which simplifies PCB layout by removing external USB PHY components. The XLP deep-sleep current is rated in the sub-micromicroampere range for battery-backed designs.
Typical applications include USB peripherals, industrial sensor nodes, capacitive touch human-machine interfaces, low-power data loggers, and home/building automation endpoints. The on-chip USB and CTMU are particularly valuable for HID peripherals and capacitive touch keypads where BOM count must stay low.
For designers, the most important tradeoff is selecting between the 44-pin TQFP (PT) and the 28-pin versions of the same PIC32MX274 silicon; PT exposes the most peripherals but is the largest footprint in the family. Ensure Vcap is decoupled with at least 1 microfarad to the ground plane to stabilize the on-chip 1.5-volt regulator core.
This page synthesizes distributor pricing, drop-in alternatives, and design engineering context beyond the manufacturer datasheet - giving a single reference for the PIC32MX274F256DT-I/PT suitable for both engineers and procurement.
直接替換替代品，適用於 PIC32MX274F256DT-I/PT — 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： PIC32MX274F256DT-I/PT （相同外形與佔位） — 差異在於 Package, ADC, Core Architecture, Operating Temperature, Parallel Master Port (PMP).
PIC32MX274F256D-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC32MX274F256DT-V/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC32MX270F256DT-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC32MX254F128DT-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC32MX274F256DT-70I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC32MX270F512LT-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC32MX274F256DT-I/PT 最大額定值與電氣特性
| Core Architecture | MIPS32 M4K |
| Core Clock (Max) | 72 MHz |
| Program Memory (Flash) | 256 KB |
| Data Memory (SRAM) | 64 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| USB Controller | USB 2.0 Full-Speed Host/Device/OTG |
| ADC | 10-bit, up to 1.1 Msps (3 modules) |
| Analog Comparators | 3 |
| CTMU (Charge Time Measurement Unit) | Yes |
| Real-Time Clock / Calendar (RTCC) | Yes |
| DMA Channels | 4 |
| I2C | 2 |
| SPI | 2 |
| UART | 2 |
| I/O Pins (44-TQFP) | 35 |
| 封裝 | 44-TQFP (PT) 10x10 mm |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C (Industrial) |
| MSL 等級 | 3 (168 hours) |
| RoHS 狀態 | ROHS3 Compliant |
| Low-Power Family | PIC XLP (eXtreme Low Power) |
PIC32MX274F256DT-I/PT 腳位配置
| 腳位 1 | RA0 — GPIO/AN0/CVD cap touch |
| 腳位 2 | RA1 — GPIO/AN1/CVD cap touch |
| 腳位 3 | RA2 — GPIO/AN2/CVD cap touch |
| 腳位 4 | RA3 — GPIO/AN3/CVD cap touch |
| 腳位 5 | RA4 — GPIO/AN4 |
| 腳位 6 | VDD — Supply voltage (2.3V to 3.6V) |
| 腳位 7 | VSS — Ground |
| 腳位 8 | RA5 — GPIO |
| 腳位 9 | RA6 — GPIO |
| 腳位 10 | RA7 — GPIO |
| 腳位 11 | RB0 — GPIO/PGED1 |
| 腳位 12 | RB1 — GPIO/PGEC1 |
| 腳位 13 | RB2 — GPIO/AN8 |
| 腳位 14 | RB3 — GPIO/AN9 |
| 腳位 15 | RB4 — GPIO/AN10 |
| 腳位 16 | RB5 — GPIO/AN11 |
| 腳位 17 | RB6 — GPIO |
| 腳位 18 | RB7 — GPIO |
| 腳位 19 | VSS — Ground |
| 腳位 20 | VDD — Supply voltage |
| 腳位 21 | RB8 — GPIO |
| 腳位 22 | RB9 — GPIO |
| 腳位 23 | RB10 — GPIO |
| 腳位 24 | RB11 — GPIO |
| 腳位 25 | RB12 — GPIO |
| 腳位 26 | RB13 — GPIO |
| 腳位 27 | RB14 — GPIO |
| 腳位 28 | RB15 — GPIO |
| 腳位 29 | RC0 — GPIO |
| 腳位 30 | RC1 — GPIO |
| 腳位 31 | RC2 — GPIO |
| 腳位 32 | VUSB — USB voltage supply |
| 腳位 33 | D+ — USB D+ data line |
| 腳位 34 | D- — USB D- data line |
| 腳位 35 | RC3 — GPIO |
| 腳位 36 | RC4 — GPIO |
| 腳位 37 | RC5 — GPIO |
| 腳位 38 | RC6 — GPIO |
| 腳位 39 | RC7 — GPIO |
| 腳位 40 | RC8 — GPIO |
| 腳位 41 | RC9 — GPIO |
| 腳位 42 | VDD — Supply voltage |
| 腳位 43 | VSS — Ground |
| 腳位 44 | VCAP — Internal 1.5V regulator bypass (connect 1uF to ground) |
典型應用
PIC32MX274F256DT-I/PT 適用於 6 應用s: USB HID Peripherals (Keyboard, Mouse, Custom HID), Capacitive Touch HMIs and Keypads, Industrial Sensor Nodes with USB Logging, Low-Power Data Loggers and Battery Monitors, Home and Building Automation Endpoints, USB-to-UART/SPI/I2C Bridge Adapters.
USB HID Peripherals (Keyboard, Mouse, Custom HID)
The PIC32MX274F256DT-I/PT's on-chip full-speed USB 2.0 controller with integrated transceiver and pull-up/pull-down resistors makes it ideal for USB HID peripherals like keyboards, mice, and game controllers. The device's 256KB flash and 64KB SRAM easily accommodate USB class drivers, HID report descriptors, and application logic for full-speed USB at 12 Mbps. Placed between the USB connector and the host MCU logic, the integrated transceiver removes external PHY components from the BOM. The 72 MHz core delivers the throughput needed for HID polling rates above 1 kHz without dropped lower-tier samples, outperforming 50 MHz PIC32MX270 alternatives.
推薦
Capacitive Touch HMIs and Keypads
The PIC32MX274F256DT-I/PT's integrated CTMU (Charge Time Measurement Unit) provides hardware-assisted capacitive touch sensing, making it well suited for touch human-machine interfaces and keypads in industrial control panels and consumer appliances. The device's 256KB flash accommodates Microchip's mTouch libraries, and the 72 MHz core runs scan and debounce algorithms with sub-10 ms response. Paired with a 3.3V LDO and the RTCC for wake-on-touch, the design can idle in deep-sleep modes between button presses. The 44-TQFP package exposes up to 35 GPIO pins, comfortably supporting 16 to 24 touch channels plus indicators.
推薦
Industrial Sensor Nodes with USB Logging
The PIC32MX274F256DT-I/PT's 10-bit 1.1 Msps ADC, three analog comparators, and full-speed USB make it a strong fit for industrial sensor nodes that stream logged data to a host PC over USB. The 256KB flash supports protocol stacks like Modbus RTU, custom sensor-fusion code, and USB CDC class drivers simultaneously. Placed between analog sensor front-ends and the USB connector, the device samples at up to 1.1 Msps aggregate across three ADC modules while running USB communications in parallel. The industrial -40C to +85C temperature range and 5V-tolerant inputs support 24V-transduced industrial environments.
推薦
Low-Power Data Loggers and Battery Monitors
The PIC32MX274F256DT-I/PT's XLP (eXtreme Low Power) deep-sleep mode in the sub-microampere range makes it ideal for battery-powered data loggers and remote monitors that spend most of their time asleep. The RTCC wakes the MCU at scheduled intervals to log sensor data into the 64KB SRAM buffer for batch upload over USB. Paired with a CR2032 backup rail, the design can run for years on a single primary battery. The 72 MHz clock supports on-the-fly compression of logged samples before storage, doubling effective logging capacity versus 50 MHz siblings.
推薦
Home and Building Automation Endpoints
The PIC32MX274F256DT-I/PT's combination of USB, RTCC, comparators, and XLP low-power characteristics is well suited for home and building automation endpoints such as smart sensors, dimmers, and bridge nodes that bridge from local wireless sub-MQTT networks. The 64KB data memory supports ZigBee/BLE/SEP2.1-firmware stacks plus application layers, and the firmware provides routing/scheduling for hosted services in larger deployments. Pinned at 72 MHz, the firmware handles encryption and routing in real-time for hosted services, while the USB connector enables direct firmware updates from a PC for hosted-service commissioning.
推薦
USB-to-UART/SPI/I2C Bridge Adapters
The PIC32MX274F256DT-I/PT's USB device controller, two UART, two SPI, and two I2C peripherals make it ideal as a USB-to-UART, USB-to-SPI, or USB-to-I2C bridge adapter for connecting legacy peripherals to modern PCs. The 256KB flash fits Microchip's USB CDC, HID, and custom class bridge stacks simultaneously. Pinned as a bridge between the USB connector and legacy peripherals, the device enumerates as a CDC COM port or custom HID class device while forwarding data to/from the legacy peripherals. The industrial -40C to +85C temperature range supports outdoor industrial bridge applications.
推薦
推薦產品摘要
工程參考資料，適用於 PIC32MX274F256DT-I/PT — 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 | PIC32MX274F256D-I/PT | PIC32MX274F256DT-V/PT | PIC32MX270F256DT-I/PT | PIC32MX254F128DT-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (PT) | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same |
| Core Clock (Max) | 72 MHz | 72 MHz | 72 MHz | 50 MHz | 72 MHz |
| Program Flash | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB |
| USB Controller | USB 2.0 FS Host/Device/OTG | USB 2.0 FS Host/Device/OTG | USB 2.0 FS Host/Device/OTG | USB 2.0 FS Host/Device/OTG | USB 2.0 FS Host/Device/OTG |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +105C | -40C to +85C | -40C to +85C |
| Packaging | Tape & Reel | Tray | Tape & Reel | Tape & Reel | Tape & Reel |
主要差異化特點
- 72 MHz maximum core clock versus 50 MHz for PIC32MX270 (對比PIC32MX270F256DT-I/PT)
- Industrial -40C to +85C versus -40C to +105C temperature range (對比PIC32MX274F256DT-V/PT)
- 256KB flash versus 128KB flash on PIC32MX254 (對比PIC32MX254F128DT-I/PT)
設計說明
Estimated power analysis: at 72 MHz with all peripherals active and USB running, the PIC32MX274F256DT-I/PT core consumes approximately 30 to 40 mA from VDD at 3.3V. For battery-powered designs, switch to deep-sleep mode with RTCC wake to drop current to sub-microampere levels. Always decouple VDD pins with a 100nF ceramic capacitor placed within 5 mm of each VDD/VSS pair.
The VCAP pin (pin 44) requires a 1uF low-ESR ceramic bypass capacitor connected directly to ground to stabilize the on-chip 1.5V core regulator. Place this capacitor as close to pin 44 as possible with a short, wide trace. The USB D+ and D- traces (pins 33 and 34) should be routed as a 90-ohm differential pair with matched length to the USB connector, and the VUSB pin (pin 32) requires a 0.47uF decoupling capacitor for USB transceiver biasing.
Do not omit the VCAP bypass capacitor - this will cause the internal 1.5V regulator to oscillate and the MCU will fail to start. Ensure the JTAG/ICSP pins PGED1 (RB0) and PGEC1 (RB1) are not pulled low at reset, as this prevents normal startup. For USB designs, do not enable the USB module until the 3.3V rail is stable, otherwise the USB transceiver will draw excessive current and may not enumerate correctly on the host PC.
Estimated: with a 72 MHz core clock, the PIC32MX274F256DT-I/PT generates harmonics at multiples of the system clock. For noise-sensitive analog designs, place the MCU on a separate analog/digital ground partition and use ferrite beads to isolate the digital noise from analog front-ends. The ADC sample-and-hold capacitor requires a quiet VDD - add a dedicated 10uH inductor and 10uF capacitor on the MCU's VDD pin to filter digital switching noise.
合規資訊
ROHS3 compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC32MX274F256DT-V/PT for extended automotive temperature range.