PIC32MX274F256BT-V/SO - 32-bit MCU, 256KB Flash, 72MHz | Microchip
MPN: PIC32MX274F256BT-V/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.45 | $6.45 |
| 10 | $5.81 | $58.10 |
| 100 | $5.16 | $516.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.13 | $4,130.00 |
PIC32MX274F256BT-V/SO Overview
A 32-bit microcontroller (MCU) is an integrated circuit containing a 32-bit CPU core, program Flash, data RAM, and a rich set of peripherals such as timers, ADC, communication interfaces (UART, SPI, I2C), and GPIO. MCUs belong to the broader semiconductor category and form the lowest tier of embedded computing hierarchy: MCU -> embedded processor -> microprocessor -> computing system. Compared with 8/16-bit MCUs, 32-bit parts handle larger data widths, run more complex firmware (often RTOS-based), and offer higher throughput at comparable cost.
Key specifications of the PIC32MX274F256BT-V/SO include 256KB on-chip Flash, 64KB SRAM, USB 2.0 Full-Speed OTG, up to 10 ADC channels at 1 Msps, four 16-bit timers/counters, two I2C and two SPI/I2S modules, and two UART modules. The PIC XLP (eXtreme Low Power) technology extends battery life in portable designs, with deep-sleep current as low as a few microamps depending on mode.
Architecturally, the device combines a single-cycle MIPS32 M4K core with a 5-stage pipeline and dedicated multiplier/divider, supported by dual-bank Flash and a 16KB instruction cache on larger variants. The peripheral set is mapped through a separate peripheral bus, allowing DMA-style transfers on some channels and keeping CPU offload efficient.
Typical applications include consumer appliances, USB peripherals (HID/keyboard/mouse), industrial control, sensor hubs, low-cost graphical interfaces, and battery-powered IoT nodes. Its automotive-grade -V (extended) temperature variant suits dashboards and other ruggedized uses. Designers benefit from the MPLAB X IDE and Harmony ecosystem.
Designers should plan for an external 8 MHz crystal or use the internal 8 MHz Fast RC oscillator with PLL to reach 72 MHz. The 28-SOIC footprint is generous for hand-soldering and breadboarding; for size-constrained designs, PIC32MX274F256BT-V/MM (28-QFN) provides the same die.
This page synthesizes distributor pricing, drop-in alternatives from the same PIC32MX27x family, and practical design notes not aggregated in the manufacturer datasheet.
Drop-in alternatives for PIC32MX274F256BT-V/SO — 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 PIC32MX274F256BT-V/SO (same form factor and footprint) — differing in Package, ADC, USB, Comparators, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX274F256B-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.35 / Unit
View Datasheet →PIC32MX270F256BT-V/SO
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC32MX254F128BT-V/SO
✅ Drop-In✓ In Stock
$2.75 / Unit
View Datasheet →PIC32MX250F256BT-V/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX170F256BT-V/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX274F256BT-V/MM
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC32MX274F256BT-V/SO Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K 32-bit |
| Family | PIC32MX27x (PIC XLP) |
| CPU Speed | 72 MHz |
| Program Flash | 256 KB |
| SRAM | 64 KB |
| Operating Voltage | 2.3 V to 3.6 V |
| Package | 28-SOIC (7.5 mm width) |
| ADC | 10-channel, 10-bit, 1 Msps |
| USB | USB 2.0 Full-Speed OTG |
| Timers | 5 x 16-bit (Timer/Counter) |
| UART | 2 |
| SPI / I2S | 2 |
| I2C | 2 |
| Temperature Range | -40C to +105C (V grade) |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
PIC32MX274F256BT-V/SO Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active-low; pull-up to VDD required |
| Pin 2 | PGED1/AN0/CVD/RB0 — Programming data, analog input 0, or RB0 GPIO |
| Pin 3 | PGEC1/AN1/CVD/RB1 — Programming clock, analog input 1, or RB1 GPIO |
| Pin 4 | AN2/CVD/RB2 — Analog input 2 or RB2 GPIO |
| Pin 5 | AN3/CVD/RB3 — Analog input 3 or RB3 GPIO |
| Pin 6 | AN4/CVD/RB4 — Analog input 4 or RB4 GPIO |
| Pin 7 | AN5/CVD/RB5 — Analog input 5 or RB5 GPIO |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RA0 — Crystal oscillator input or external clock input or RA0 GPIO |
| Pin 10 | OSC2/CLKO/RA1 — Crystal oscillator output or RA1 GPIO |
| Pin 11 | D+/RG2 — USB D+ data line or RG2 GPIO |
| Pin 12 | D-/RG3 — USB D- data line or RG3 GPIO |
| Pin 13 | VDD — Positive supply voltage (2.3 V to 3.6 V) |
| Pin 14 | RA2/SDA2 — RA2 GPIO or I2C2 SDA |
| Pin 15 | RA3/SCL2 — RA3 GPIO or I2C2 SCL |
| Pin 16 | RA4 — RA4 GPIO |
| Pin 17 | RA5 — RA5 GPIO |
| Pin 18 | RA6 — RA6 GPIO |
| Pin 19 | RA7 — RA7 GPIO |
| Pin 20 | RB6/PGEC2 — RB6 GPIO or alternate programming clock |
| Pin 21 | RB7/PGED2 — RB7 GPIO or alternate programming data |
| Pin 22 | RB8 — RB8 GPIO |
| Pin 23 | RB9 — RB9 GPIO |
| Pin 24 | RB10 — RB10 GPIO |
| Pin 25 | RB11 — RB11 GPIO |
| Pin 26 | RB12 — RB12 GPIO |
| Pin 27 | RB13 — RB13 GPIO |
| Pin 28 | RB14/AN6 — RB14 GPIO or analog input 6 |
Typical Applications
PIC32MX274F256BT-V/SO is suitable for 6 applications: USB HID / Keyboard / Mouse Controller, Industrial Sensor Hub & Control, Battery-Powered IoT Sensor Node, Consumer Appliance HMI / Display Controller, Automotive Interior / Dashboard Module, Audio Bridge / USB Audio Class Device.
USB HID / Keyboard / Mouse Controller
The PIC32MX274F256BT-V/SO's integrated USB 2.0 Full-Speed OTG controller and 72 MHz MIPS M4K core make it well suited to USB HID peripherals such as keyboards, mice, game controllers, and HID-class composite devices. With 256 KB Flash, the Microchip USB stack plus HID report descriptors fits comfortably alongside a custom bootloader. The 64 KB RAM is more than enough for HID ring buffers, debounce state, and a small RGB-backlight lookup table. The 28-SOIC package is friendly to hand-soldered prototypes and low-volume runs typical of PC peripherals.
Recommended
Industrial Sensor Hub & Control
At 72 MHz, the PIC32MX274F256BT-V/SO can poll multiple ADC channels at 1 Msps and run a small DSP filter to extract RMS values from industrial sensor signals. The 10-bit ADC at 1 Msps is adequate for current sensing, vibration analysis, and simple process-control loops when paired with an op-amp front end. The 256 KB Flash is sufficient for Modbus RTU libraries and a simple state machine, while the 64 KB RAM allows queue-based command handling. The -V temperature grade to +105C supports enclosed control cabinets and motor-drive proximity designs.
Recommended
Battery-Powered IoT Sensor Node
The PIC32MX274F256BT-V/SO leverages Microchip's PIC XLP (eXtreme Low Power) technology, with deep-sleep currents in the single-digit microamp range when peripherals are gated. Combined with the 72 MHz performance headroom, it can wake, take ADC readings, transmit over UART or I2C, and return to deep sleep within milliseconds. The 256 KB Flash supports OTA-capable bootloaders, and the 64 KB RAM is plenty for protocol buffers (BLE, LoRa, or NB-IoT) before transfer. The 28-SOIC footprint is well suited to AAA or coin-cell powered sensor enclosures.
Recommended
Consumer Appliance HMI / Display Controller
The PIC32MX274F256BT-V/SO drives small monochrome or color TFT LCDs via the PMP (Parallel Master Port) or SPI interfaces, making it useful for coffee machines, microwaves, and washing-machine user interfaces. The 256 KB Flash stores UI bitmaps, fonts, and the state machine; the 64 KB RAM serves as a frame buffer for low-resolution displays. The 2.3 V to 3.6 V operating range is compatible with 3.3 V LCD panels directly. Two I2C and two SPI channels allow simultaneous touch-controller and LED-driver connections.
Recommended
Automotive Interior / Dashboard Module
The PIC32MX274F256BT-V/SO in -V grade operates from -40C to +105C, which covers automotive interior cabin requirements including dashboard clusters, HVAC panels, and lighting controllers. The 72 MHz CPU handles LIN or CAN software stacks (via SPI-to-CAN transceivers), button-debounce, and PWM-driven LED matrixes. 256 KB Flash holds the application plus a CAN-friendly bootloader; 64 KB RAM is ample for CAN message buffers. The 28-SOIC package is suitable for low-vibration interior modules where thermal cycling is more limiting than mechanical shock.
Recommended
Audio Bridge / USB Audio Class Device
The PIC32MX274F256BT-V/SO can implement USB Audio Class 1.0 devices (headphones, speakers, microphones) at 48 kHz / 16-bit using Microchip's USB audio stack. The 256 KB Flash fits the USB Audio Class firmware plus I2S peripheral configuration. Two I2S-capable SPI modules support stereo input and output paths simultaneously, and the 72 MHz CPU has enough bandwidth to drive 48 kHz / 24-bit streams with modest DSP. The 64 KB RAM buffers USB packets with no need for external memory.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX274F256BT-V/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX274F256B-I/SO | PIC32MX270F256BT-V/SO | PIC32MX254F128BT-V/SO | PIC32MX250F256BT-V/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Flash | 256 KB | 256 KB | 256 KB | 128 KB | 256 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 32 KB | 64 KB |
| Max CPU Speed | 72 MHz | 72 MHz | 72 MHz | 72 MHz | 50 MHz |
| USB OTG | Yes | Yes | Yes | Yes | No |
| Temperature Grade | -40C to +105C (V) | -40C to +85C (I) | -40C to +105C (V) | -40C to +105C (V) | -40C to +105C (V) |
| 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 |
Key Differentiators
- Highest CPU frequency in 28-SOIC PIC32MX27x family (vs PIC32MX250F256BT-V/SO)
- Extended -V temperature grade to +105C (vs PIC32MX274F256B-I/SO)
- 256 KB dual-bank Flash with live update support (vs PIC32MX254F128BT-V/SO)
Design Notes
Power the PIC32MX274F256BT-V/SO from a low-noise 3.3 V regulator; place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic cap on the supply rail. For battery designs, use the PIC XLP deep-sleep mode with peripherals gated to drop quiescent current into single-digit uA. AVDD must be tied to VDD if the ADC is unused, never left floating.
Estimated: route the 48 MHz USB D+/D- differential pair with 90 ohm differential impedance, 8 mm max length, and guard ground on both sides. Keep the USB traces away from switching signals (PWM, switching regulators) to avoid radiated EMI. The 28-SOIC pin pitch is 1.27 mm, which is comfortable for 4-layer boards; on 2-layer boards use a ground pour on the bottom layer for return paths.
Do not leave MCLR floating; tie it through a 10 kohm pull-up to VDD. Failure to do so results in spurious resets in noisy environments. The PGC/PGD pins must be accessible for in-circuit serial programming (ICSP); do not connect them to loads that prevent the programmer from driving the lines. Finally, configure the unused I/O pins as outputs and tied low, never floating, to minimize current leakage.
Compliance Information
RoHS and REACH declarations are available from Microchip. The -V grade is qualified for automotive interior temperature ranges but is NOT formally AEC-Q100 certified. For full AEC-Q100, contact Microchip about PIC32MK or dsPIC33A variants.
