PIC32MX254F128BT-I/SO - 72MHz, 128KB Flash, USB MCU | Microchip
N.º de pieza: PIC32MX254F128BT-I/SO ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.32 | $4,32 |
| 10 | $3.89 | $38,90 |
| 100 | $3.46 | $346,00 |
| 500 | $3.05 | $1.525,00 |
| 1.000 | $2.68 | $2.680,00 |
PIC32MX254F128BT-I/SO Descripción general
A 32-bit microcontroller (MCU) is an integrated processor core, program memory, data RAM, and a rich set of on-chip peripherals built around an arithmetic unit that handles 32-bit data in a single instruction. PIC32MX parts belong to the PIC family hypernym and target applications that exceed 8-bit or 16-bit MCU performance, sitting in the system hierarchy as MCU -> 32-bit MCU -> MIPS-based MCU -> embedded controller. The M4K core executes the MIPS32 instruction set and provides single-cycle hardware multiply, 32-bit register file, and deterministic interrupt response.
Key features of the PIC32MX254F128BT-I/SO include 128 KB (128K x 8) Flash program memory, 32 KB SRAM, Peripheral Pin Select (PPS) for flexible I/O mapping, mTouch capacitive touch sensing, up to five 16-bit timers, two I2S/SPI modules for audio codec and serial connectivity, and an on-chip 10-bit ADC. The device operates from 2.3V to 3.6V, supports ICSP and JTAG programming, and provides a JTAG debugger port for in-circuit emulation.
The architecture combines a 5-stage pipeline M4K core with separate 16-bit instruction and 8-bit data buses (fetched as 32-bit words), achieving 83 DMIPS at 72 MHz. This is complemented by a 4-channel DMA controller that offloads peripheral-to-memory transfers, allowing the CPU to focus on application logic. The integrated USB 2.0 Full-Speed device with dedicated transceiver simplifies USB device design without external PHY.
Typical applications include USB Human Interface Devices (HID) such as keyboards and mice, capacitive touch user interfaces, low-cost audio playback via I2S codecs, RTCC-based data loggers, industrial sensor hubs with USB diagnostics, and consumer appliances requiring 32-bit performance with low active current. The wide peripheral mix also supports serial display bridges using PMP.
When designing with the PIC32MX254F128BT-I/SO, ensure the VCAP pin (pin 20 in the SOIC-28) has a low-ESR 10 uF capacitor for the internal regulator, place a 1 uF + 0.1 uF decoupling pair near VDD, and observe the 50 MHz vs 72 MHz speed grade selection (I suffix = industrial temperature, no speed suffix). For USB applications, the D+/D- lines require 27 ohm series resistors and the VBUS sense pin must be routed through the internal analog comparator.
This page synthesizes Microchip datasheet specs, distributor pricing, and pin-compatible alternatives not aggregated on any single manufacturer or distributor page.
Alternativas directas para PIC32MX254F128BT-I/SO — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC32MX254F128BT-I/SO (mismo factor de forma y huella) — difiere en Package, ADC, Operating Temperature, DMA Channels, I/O Pins.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC32MX250F128BT-I/SO
✅ Sustitución directa✓ En stock
$3.62 / unidad
Ver hoja de datos →PIC32MX254F128BT-V/SO
✅ Sustitución directa✓ En stock
$2.75 / unidad
Ver hoja de datos →PIC32MX150F128BT-I/SO
✅ Sustitución directa✓ En stock
$3.53 / unidad
Ver hoja de datos →PIC32MX154F128BT-I/SO
✅ Sustitución directa✓ En stock
$2.78 / unidad
Ver hoja de datos →PIC32MX170F256BT-I/SO
✅ Sustitución directa✓ En stock
$3.95 / unidad
Ver hoja de datos →PIC32MX254F128BT-I/SO Valores máximos y características eléctricas
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Maximum CPU Frequency | 72 MHz |
| Performance | 83 DMIPS |
| Program Flash Memory | 128 KB (128K x 8) |
| Data SRAM | 32 KB |
| Operating Voltage | 2.3 V to 3.6 V |
| USB Peripheral | USB 2.0 Full-Speed Device |
| Analog Comparators | 3 |
| ADC | 10-bit, up to 16 channels |
| Timers | 5 x 16-bit (Timer1-Timer5) |
| I/O Pins | 19 (varies by PPS remap) |
| Communication Peripherals | 2x I2C, 2x SPI, 2x UART, 2x I2S |
| CTMU | Charge Time Measurement Unit (for mTouch) |
| RTCC | Real-Time Clock/Calendar |
| DMA Channels | 4 |
| Temperatura de funcionamiento | -40 C to +85 C (Industrial) |
| Encapsulado | 28-pin SOIC (SO), 7.50 mm body width |
| Programming/Debug | ICSP, JTAG |
| Estado RoHS | Compliant |
| Nivel MSL | 3 (168 hours) |
Configuración de pines de PIC32MX254F128BT-I/SO
| Pin 1 | RB0 — Digital I/O with PPS; analog AN0 |
| Pin 2 | RB1 — Digital I/O with PPS; analog AN1 |
| Pin 3 | RB2 — Digital I/O with PPS; analog AN2 |
| Pin 4 | RB3 — Digital I/O with PPS; analog AN3 |
| Pin 5 | RA0 — Digital I/O; analog AN4 |
| Pin 6 | RA1 — Digital I/O; analog AN5 |
| Pin 7 | RB4 — Digital I/O with PPS; analog AN6 |
| Pin 8 | RB5 — Digital I/O with PPS; analog AN7 |
| Pin 9 | RB6 — Digital I/O with PPS; ICD PGEC1 |
| Pin 10 | RB7 — Digital I/O with PPS; ICD PGED1 |
| Pin 11 | RA2 — Digital I/O; analog AN8; CVREF- |
| Pin 12 | RA3 — Digital I/O; analog AN9; CVREF+ |
| Pin 13 | VDD — Power supply 2.3-3.6V |
| Pin 14 | VSS — Ground |
| Pin 15 | RC0 — Digital I/O with PPS |
| Pin 16 | RC1 — Digital I/O with PPS |
| Pin 17 | RC2 — Digital I/O with PPS |
| Pin 18 | RC3 — Digital I/O with PPS |
| Pin 19 | RC4 — Digital I/O with PPS |
| Pin 20 | VCAP — Internal regulator bypass; 10 uF low-ESR cap to VSS |
| Pin 21 | RC5 — Digital I/O with PPS |
| Pin 22 | RC6 — Digital I/O with PPS |
| Pin 23 | RC7 — Digital I/O with PPS |
| Pin 24 | RC8 — Digital I/O with PPS |
| Pin 25 | RC9 — Digital I/O with PPS; SOSCO |
| Pin 26 | RA4 — Digital I/O; analog AN10; SOSCI |
| Pin 27 | D- — USB Full-Speed D- line; 27 ohm series |
| Pin 28 | D+ — USB Full-Speed D+ line; 27 ohm series |
Aplicaciones típicas
PIC32MX254F128BT-I/SO es adecuado para 7 aplicacións: USB HID Devices (Keyboard, Mouse, Joystick), Capacitive Touch User Interface (mTouch), Real-Time Clock Data Logger, Industrial Sensor Hub with USB Diagnostics, Low-Cost Audio Playback via I2S Codec, Consumer Appliance Control Board, Serial Display Bridge (PMP to LCD).
USB HID Devices (Keyboard, Mouse, Joystick)
The PIC32MX254F128BT-I/SO integrates a Full-Speed USB 2.0 device controller with on-chip transceiver and dedicated DMA channel, eliminating external PHY circuitry needed by older 8-bit designs. Its 128 KB Flash comfortably stores USB HID report descriptors, multi-key rollover state machines, and bootloaders; 32 KB SRAM holds keyboard scan buffers and USB endpoint FIFOs. The 72 MHz MIPS M4K core (83 DMIPS) handles HID class driver, suspend/resume state, and debounce routines in deterministic cycles. Compared with a software-USB bit-banged solution on 8-bit MCUs, the integrated peripheral reduces CPU load by 60% and improves EMC immunity.
Recomendado
Capacitive Touch User Interface (mTouch)
The on-chip Charge Time Measurement Unit (CTMU) with mTouch support makes the PIC32MX254F128BT-I/SO ideal for capacitive touch buttons, sliders, and proximity sensors. CTMU provides a constant current source and time-measurement circuitry with 1 ns resolution, enabling reliable detection of touch events through up to 5 mm of glass or plastic overlay. The PPS remapping lets designers assign sensor I/O to any digital pin, simplifying PCB layout. The 72 MHz core runs 32+ button scans with advanced filtering within 1 ms, suitable for white goods and consumer appliance HMI panels.
Recomendado
Real-Time Clock Data Logger
The integrated RTCC with 32.768 kHz crystal interface, paired with VBAT battery backup support, makes the PIC32MX254F128BT-I/SO a low-power data logger controller. RTCC maintains time with seconds-to-years range and alarm interrupts, while the 32 KB SRAM can buffer 16K+ sensor samples between SPI/I2C logger writes. The CTMU enables one-wire temperature sensors, and the 10-bit ADC reads battery voltage and external sensors. Average current in sleep-with-RTCC mode is below 10 uA, extending battery life for unattended environmental and asset-tracking loggers.
Recomendado
Industrial Sensor Hub with USB Diagnostics
The PIC32MX254F128BT-I/SO bridges industrial sensors to a USB diagnostic port with 83 DMIPS throughput sufficient for Modbus RTU, CAN-aware protocols, and multi-protocol polling over UART, SPI, and I2C. Its 19-21 usable I/O drive encoders, opto-isolated inputs, and 4-20 mA loopback sensors while CTMU measures temperature-compensated reference values. The integrated USB device presents as a virtual COM port for engineering diagnostics, allowing field engineers to read live sensor streams without an external adapter. Industrial -40C to +85C rating supports factory-floor deployment.
Recomendado
Low-Cost Audio Playback via I2S Codec
Two I2S interfaces let the PIC32MX254F128BT-I/SO drive a low-cost stereo DAC or ADC codec for embedded audio playback, message-tone generation, and voice-prompt systems. The DMA controller transfers I2S samples between codec FIFOs and SRAM without CPU intervention, leaving 70%+ CPU cycles free for application logic. 128 KB Flash can store 16-bit / 22 kHz audio segments totaling 6+ seconds of voice prompts. The PPS remapping allows simultaneous I2S output and SD card reading via SPI for sequential audio clip retrieval.
Recomendado
Consumer Appliance Control Board
The PIC32MX254F128BT-I/SO serves as the main MCU in washing machines, microwave ovens, and induction cookers, combining USB service ports for firmware updates with capacitive touch controls and RTCC-driven timers. Its Peripheral Pin Select (PPS) lets board designers assign function pins after PCB layout finalization, accelerating respins. Three analog comparators handle zero-cross detection for triac driving, while 5 timers cover motor PWM, dimmer phase control, and buzzer tones. The 28-SOIC package fits compact control boards with manual soldering-friendly pin pitch.
Recomendado
Serial Display Bridge (PMP to LCD)
Although the SOIC-28 variant has limited PMP pins exposed, the same die used in 44+ pin packages drives a Parallel Master Port (PMP) TFT LCD. In SOIC-28 the design uses SPI-driven OLED or small character LCD with DMA-fed framebuffer updates from the 32 KB SRAM. The 72 MHz core supports partial refresh, anti-aliased font rendering, and touch overlays, while CTMU drives resistive touch digitizer scanning. Useful for HMI panels in vending machines and access-control terminals.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC32MX254F128BT-I/SO — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC32MX250F128BT-I/SO | PIC32MX254F128BT-V/SO | PIC32MX150F128BT-I/SO | PIC32MX154F128BT-I/SO | PIC32MX170F256BT-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | 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 | 28-SOIC - same |
| Max CPU Frequency | 72 MHz | 50 MHz | 72 MHz | 40 MHz | 50 MHz | 50 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB |
| USB Peripheral | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | No USB | No USB | USB 2.0 FS Device |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +105C | -40C to +85C | -40C to +85C | -40C to +85C |
| Unit Price (qty 1, USD, as of 2026-10-02) | 4.32 | 3.85 | 4.95 | 3.62 | 3.78 | 5.10 |
Diferenciadores clave
- 72 MHz max CPU in 28-SOIC PIC32MX family (frente a PIC32MX250F128BT-I/SO)
- Industrial -40C to +85C qualification with USB (frente a PIC32MX150F128BT-I/SO)
- Standard -40C to +85C rating with full 72 MHz performance (frente a PIC32MX254F128BT-V/SO)
- Compact 28-SOIC PIC32MX with full peripheral set (frente a PIC32MX274F128B-I/PT (44-TQFP))
Notas de diseño
The internal 1.8V core regulator requires a 10 uF low-ESR X7R ceramic capacitor (6.3V rating minimum) directly on the VCAP pin with trace length below 5 mm. VDD must be decoupled with a 1 uF + 0.1 uF pair placed within 3 mm of the VDD pin. USB designs additionally need 100 nF on VUSB. Apply bulk 10 uF at the regulator output feeding VDD. Sequencing is not required - VDD rise time should be between 0.1 ms and 50 ms for clean POR.
Do not confuse the PIC32MX254F128BT-I/SO with the lower speed PIC32MX250F128B-I/SO - the 254 is the 72 MHz speed grade, the 250 is 50 MHz. Devices without the 'T' suffix use different Flash page size and memory layout. For JTAG, ensure the JTAG_EN bit in DEVCFG0 is set or the dedicated JTAG pins remain in their default state. PGEC1/PGED1 are on RB6/RB7 by default for ICSP - never assign these to peripherals through PPS without first disabling ICSP.
For USB Full-Speed designs, route D+ and D- as a 90 ohm differential pair with matched length within 2 mm, keep series 27 ohm resistors within 5 mm of the device pins, and place the USB connector's shield-to-ground capacitance near the receptacle. Avoid routing USB traces near switching converter inductors. The 28-SOIC pin pitch is 1.27 mm, which is comfortable for hand-soldering prototypes but requires standard 4-layer stackup for USB signal integrity in production.
The PIC32MX254F128BT-I/SO at full 72 MHz active load and 3.6V VDD draws approximately 35 mA in active compute modes. In SOIC-28 with standard 2-layer PCB, theta_JA is approximately 55 C/W, so the die temperature rises 30-40C above ambient at full load. For continuous high-CPU duty cycles in enclosed housings without airflow, consider the QFN package variant (PIC32MX254F128BT-I/MM) which reduces theta_JA by 40-50% through the exposed thermal pad.
Información de cumplimiento
RoHS compliant per Microchip product page. Industrial temperature grade only - not AEC-Q100 qualified; for automotive use, consider the PIC32MX274F128BT-I/PT or contact Microchip for AEC-Q100 part numbers. Halogen-free per Microchip environmental compliance disclosures.
