PIC32MX274F256DT-I/PT - 32-bit MCU 256KB Flash USB 44-TQFP | Microchip
MPN: PIC32MX274F256DT-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.45 | $5.45 |
| 10 | $4.95 | $49.50 |
| 100 | $4.32 | $432.00 |
| 500 | $3.78 | $1,890.00 |
| 1,000 | $3.29 | $3,290.00 |
PIC32MX274F256DT-I/PT Overview
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.
Drop-in alternatives for PIC32MX274F256DT-I/PT — 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 PIC32MX274F256DT-I/PT (same form factor and footprint) — differing in Package, ADC, Core Architecture, Operating Temperature, Parallel Master Port (PMP).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX274F256D-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX274F256DT-V/PT
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC32MX270F256DT-I/PT
✅ Drop-In✓ In Stock
$3.92 / Unit
View Datasheet →PIC32MX254F128DT-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX274F256DT-70I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX270F512LT-I/PT
✅ Drop-In✓ In Stock
$4.42 / Unit
View Datasheet →PIC32MX274F256DT-I/PT Maximum Ratings & Electrical Characteristics
| 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 |
| Package | 44-TQFP (PT) 10x10 mm |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial) |
| MSL Level | 3 (168 hours) |
| RoHS Status | ROHS3 Compliant |
| Low-Power Family | PIC XLP (eXtreme Low Power) |
PIC32MX274F256DT-I/PT Pin Configuration
| Pin 1 | RA0 — GPIO/AN0/CVD cap touch |
| Pin 2 | RA1 — GPIO/AN1/CVD cap touch |
| Pin 3 | RA2 — GPIO/AN2/CVD cap touch |
| Pin 4 | RA3 — GPIO/AN3/CVD cap touch |
| Pin 5 | RA4 — GPIO/AN4 |
| Pin 6 | VDD — Supply voltage (2.3V to 3.6V) |
| Pin 7 | VSS — Ground |
| Pin 8 | RA5 — GPIO |
| Pin 9 | RA6 — GPIO |
| Pin 10 | RA7 — GPIO |
| Pin 11 | RB0 — GPIO/PGED1 |
| Pin 12 | RB1 — GPIO/PGEC1 |
| Pin 13 | RB2 — GPIO/AN8 |
| Pin 14 | RB3 — GPIO/AN9 |
| Pin 15 | RB4 — GPIO/AN10 |
| Pin 16 | RB5 — GPIO/AN11 |
| Pin 17 | RB6 — GPIO |
| Pin 18 | RB7 — GPIO |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Supply voltage |
| Pin 21 | RB8 — GPIO |
| Pin 22 | RB9 — GPIO |
| Pin 23 | RB10 — GPIO |
| Pin 24 | RB11 — GPIO |
| Pin 25 | RB12 — GPIO |
| Pin 26 | RB13 — GPIO |
| Pin 27 | RB14 — GPIO |
| Pin 28 | RB15 — GPIO |
| Pin 29 | RC0 — GPIO |
| Pin 30 | RC1 — GPIO |
| Pin 31 | RC2 — GPIO |
| Pin 32 | VUSB — USB voltage supply |
| Pin 33 | D+ — USB D+ data line |
| Pin 34 | D- — USB D- data line |
| Pin 35 | RC3 — GPIO |
| Pin 36 | RC4 — GPIO |
| Pin 37 | RC5 — GPIO |
| Pin 38 | RC6 — GPIO |
| Pin 39 | RC7 — GPIO |
| Pin 40 | RC8 — GPIO |
| Pin 41 | RC9 — GPIO |
| Pin 42 | VDD — Supply voltage |
| Pin 43 | VSS — Ground |
| Pin 44 | VCAP — Internal 1.5V regulator bypass (connect 1uF to ground) |
Typical Applications
PIC32MX274F256DT-I/PT is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX274F256DT-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- 72 MHz maximum core clock versus 50 MHz for PIC32MX270 (vs PIC32MX270F256DT-I/PT)
- Industrial -40C to +85C versus -40C to +105C temperature range (vs PIC32MX274F256DT-V/PT)
- 256KB flash versus 128KB flash on PIC32MX254 (vs PIC32MX254F128DT-I/PT)
Design Notes
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.
Compliance Information
ROHS3 compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC32MX274F256DT-V/PT for extended automotive temperature range.