PIC32MX154F128B-I/SO - 32-bit MCU, 128KB Flash, 72MHz | Microchip
MPN: PIC32MX154F128B-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.78 | $27.80 |
| 100 | $2.46 | $246.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.83 | $1,830.00 |
| 3,000 | $1.69 | $5,070.00 |
PIC32MX154F128B-I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and programmable peripherals. The PIC32MX family belongs to the broader category of 32-bit embedded microcontrollers within Microchip's product hierarchy: 32-bit MCU -> MIPS M4K core -> PIC32 family -> PIC32MX1xx/2xx sub-family. These devices serve as the central processing unit in embedded systems, executing firmware stored in non-volatile Flash while interfacing with sensors, actuators, and communication buses.
The PIC32MX154F128B delivers 83 DMIPS throughput at 72 MHz and integrates peripherals such as UART, SPI, I2C, 10-bit ADC, and PWM outputs suitable for mixed-signal control. XLP technology provides deep-sleep currents as low as sub-microampere, enabling battery-powered designs. The CTMU enables capacitive touch sensing and precision time measurement, while the RTCC maintains accurate wall-clock time during low-power modes.
Architecture-wise, the device uses a 5-stage pipeline MIPS32 M4K core with single-cycle multiplication hardware. Peripheral Pin Select (PPS) allows flexible remapping of digital peripheral functions to physical pins, simplifying PCB layout and reducing pin conflicts. The 28-SOIC package is the most popular industrial footprint for through-hole-compatible surface-mount designs.
Typical applications include industrial control nodes, low-power IoT sensor hubs, consumer appliances, USB-to-UART bridges, capacitive touch interfaces, and battery-operated instrumentation. The combination of 128 KB Flash and 32 KB SRAM suits mid-sized firmware projects requiring USB device, graphics, or audio processing support per the family datasheet.
When designing with this part, engineers should allocate decoupling capacitors within 5 mm of each VDD pin pair and provide a stable 3.3 V rail; the brown-out reset and watchdog timer are recommended for industrial reliability. The 28-SOIC footprint enables hand-soldering and rework, but production lines should follow JEDEC J-STD-020 reflow profiles.
This page synthesizes distributor pricing, drop-in alternatives from the PIC32MX1xx/2xx family, and practical design notes that go beyond the manufacturer datasheet content. Comparison tables highlight key parametric differences versus PIC32MX150F128B and PIC32MX170F256B variants in the same SOIC-28 footprint.
Drop-in alternatives for PIC32MX154F128B-I/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 PIC32MX154F128B-I/SO (same form factor and footprint) — differing in Package, MSL Level, Core Architecture, ADC, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX150F128B-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX170F256B-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX250F128B-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX154F128B-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX174F256B-I/SO
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →PIC32MX155F128B-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX154F128B-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Maximum CPU Frequency | 72 MHz |
| Flash Memory | 128 KB (128K x 8) |
| SRAM | 32 KB |
| Operating Voltage Range | 2.5 V to 3.6 V |
| Number of I/O Pins | 21 |
| Package | 28-SOIC (0.295 inch / 7.50 mm width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (Industrial -I grade) |
| Analog Comparators | 3 |
| ADC | 10-bit (per family datasheet) |
| CTMU | Yes (Charge Time Measurement Unit) |
| RTCC | Yes (Real-Time Clock Calendar) |
| Peripheral Pin Select (PPS) | Yes |
| XLP (eXtreme Low Power) | Yes |
| DMIPS Performance | 83 DMIPS at 72 MHz |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
PIC32MX154F128B-I/SO Pin Configuration
| Pin 1 | RA0 — Digital I/O / ICSPDAT / PMA0 (analog input capable) |
| Pin 2 | RA1 — Digital I/O / PMA1 / AN45 (analog input) |
| Pin 3 | RB0 — Digital I/O / PGED1 / AN0 (analog input) |
| Pin 4 | RB1 — Digital I/O / PGEC1 / AN1 (analog input) |
| Pin 5 | RB2 — Digital I/O / AN2 (analog input) |
| Pin 6 | RB3 — Digital I/O / AN3 (analog input) |
| Pin 7 | RB4 — Digital I/O / AN4 / C1IN- |
| Pin 8 | RB5 — Digital I/O / AN5 / C2IN- |
| Pin 9 | RB6 — Digital I/O / AN6 / ICSPCLK1 |
| Pin 10 | RB7 — Digital I/O / AN7 / ICSPDAT1 |
| Pin 11 | VSS — Ground reference |
| Pin 12 | VDD — Positive supply input (2.5-3.6 V) |
| Pin 13 | RB8 — Digital I/O / AN8 |
| Pin 14 | RB9 — Digital I/O / AN9 |
| Pin 15 | RB10 — Digital I/O / AN10 / CVREF- |
| Pin 16 | RB11 — Digital I/O / AN11 |
| Pin 17 | RB12 — Digital I/O / AN12 |
| Pin 18 | RB13 — Digital I/O / AN13 |
| Pin 19 | RB14 — Digital I/O / AN14 |
| Pin 20 | RB15 — Digital I/O / AN15 / OCFB |
| Pin 21 | VSS — Ground reference (second VSS pin) |
| Pin 22 | VDD — Positive supply input (second VDD pin) |
| Pin 23 | RC0 — Digital I/O |
| Pin 24 | RC1 — Digital I/O |
| Pin 25 | RC2 — Digital I/O / DAC1 / C3IN+ |
| Pin 26 | RC3 — Digital I/O |
| Pin 27 | RC4 — Digital I/O / D- |
| Pin 28 | RC5 — Digital I/O / D+ |
Typical Applications
PIC32MX154F128B-I/SO is suitable for 7 applications: Industrial Control Nodes, Battery-Powered IoT Sensor Hubs, Capacitive Touch User Interfaces, Consumer Appliance Control Boards, USB-to-UART/I2C Bridge Adapters, Low-Cost Graphics Display Controllers, Battery-Charging and Power Management Controllers.
Industrial Control Nodes
The PIC32MX154F128B-I/SO fits industrial control nodes because its 72 MHz MIPS32 M4K core executes real-time control loops in under 10 us while the 128 KB Flash accommodates Modbus, CANopen, or EtherCAT slave stacks. The 32 KB SRAM is sufficient for 1 kHz PID loops and message buffering. Its -40 C to +85 C industrial temperature rating meets IEC 60068-2-1 cold and IEC 60068-2-2 hot operating profiles for factory-floor installations.
Recommended
Battery-Powered IoT Sensor Hubs
The PIC32MX154F128B-I/SO's XLP (eXtreme Low Power) technology delivers deep-sleep currents below 1 uA with RTCC wake-up, making it ideal for battery-powered IoT sensor hubs reporting temperature, humidity, or motion over BLE or sub-GHz radios every few minutes. The 72 MHz burst performance handles AES-128 encryption and sensor fusion on demand while spending most of the duty cycle in deep-sleep mode. Three analog comparators enable zero-crossing wake-up without ADC power.
Recommended
Capacitive Touch User Interfaces
The integrated CTMU (Charge Time Measurement Unit) on the PIC32MX154F128B-I/SO enables mTouch capacitive touch buttons, sliders, and proximity sensors without external touch ICs. Designers can implement 12+ touch channels using the CTMU's 1 ns time-measurement resolution, saving BOM cost versus dedicated touch controllers. The 32 KB SRAM supports debounce algorithms and gesture recognition, while the 72 MHz CPU delivers sub-5 ms response time for responsive UI feedback.
Recommended
Consumer Appliance Control Boards
The PIC32MX154F128B-I/SO is well-suited for consumer appliances such as coffee machines, washing machines, and microwave ovens because its 21 GPIO drive relays, triacs, and seven-segment displays directly while three comparators monitor sensor feedback. The 128 KB Flash holds appliance firmware plus a small RTOS, and the 32 KB SRAM supports display buffers. Peripheral Pin Select (PPS) simplifies PCB routing by remapping UART, SPI, and I2C functions to any digital pin.
Recommended
USB-to-UART/I2C Bridge Adapters
The PIC32MX154F128B-I/SO can serve as the host MCU in USB-to-UART or USB-to-I2C bridge adapters, leveraging its 72 MHz CPU to handle USB Full-Speed enumeration via software stacks. The 32 KB SRAM accommodates USB endpoint buffers and protocol state machines. Designers using the PIC32MX250 variant gain hardware USB OTG, but the PIC32MX154F128B remains a cost-effective solution for bit-banged bridges and CP2102-style debug tools.
Recommended
Low-Cost Graphics Display Controllers
The PIC32MX154F128B-I/SO drives small TFT or OLED displays through its PMP (Parallel Master Port) interface and SPI peripherals, making it suitable for low-cost graphics display controllers in point-of-sale terminals and instrumentation. At 72 MHz the MCU refreshes QVGA (320x240) displays at 30+ FPS for menu UIs. The 32 KB SRAM provides frame buffers up to 16K pixels while 128 KB Flash holds font tables and graphics assets.
Recommended
Battery-Charging and Power Management Controllers
The PIC32MX154F128B-I/SO manages multi-chemistry battery charging in portable medical and test equipment by combining 10-bit ADC for voltage/current sense, PWM for synchronous buck control, and UART for SMBus/Battery Management Protocol communication. The CTMU provides precision timing for charge-cycle termination. Operating from 2.5 V to 3.6 V, the MCU runs directly from a single-cell Li-ion rail without auxiliary regulators.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX154F128B-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX150F128B-I/SO | PIC32MX170F256B-I/SO | PIC32MX250F128B-I/SO | PIC32MX154F128B-I/SP | PIC32MX174F256B-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SPDIP - same footprint pattern | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Core | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| Maximum CPU Frequency | 72 MHz | 50 MHz | 72 MHz | 72 MHz | 72 MHz | 72 MHz |
| Flash Memory | 128 KB | 128 KB | 256 KB | 128 KB | 128 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 64 KB | 32 KB | 32 KB | 64 KB |
| USB Peripheral | No (via PIC32MX250 variant) | No | No | Yes (USB 2.0 FS OTG) | No | No |
| Number of I/O Pins | 21 | 21 | 21 | 21 | 21 | 21 |
| Operating Voltage | 2.5 V to 3.6 V | 2.5 V to 3.6 V | 2.5 V to 3.6 V | 2.5 V to 3.6 V | 2.5 V to 3.6 V | 2.5 V to 3.6 V |
| Approximate 1k+ Unit Price (USD) | $1.83 | $1.65 | $2.50 | $2.40 | $1.95 | $2.75 |
Key Differentiators
- Higher 72 MHz CPU clock vs older PIC32MX1xx generation (vs PIC32MX150F128B-I/SO)
- XLP deep-sleep mode with sub-microamp quiescent current (vs PIC32MX170F256B-I/SO)
- Integrated CTMU for capacitive touch without external IC (vs PIC32MX250F128B-I/SO)
- Peripheral Pin Select (PPS) flexibility (vs PIC32MX174F256B-I/SO)
Design Notes
Place a 10 uF bulk capacitor and a 0.1 uF ceramic decoupling capacitor within 5 mm of the VDD pin pairs (pins 12/22). The PIC32MX154F128B-I/SO has two VDD/VDDcore pins and two VSS pins; all must be connected per the family datasheet. For battery-powered designs, route an external 32.768 kHz crystal to the SOSC pins to enable RTCC-based deep-sleep wake-up with under 1 uA total quiescent current.
Keep ICSP traces (PGEC1/PGED1 on pins 4/3 and PGEC2/PGED2 on alternate pins) short and away from switching signals to ensure reliable in-circuit programming. Per Microchip layout guidelines, maintain at least 3 mm clearance between the 28-SOIC crystal traces and digital I/O to reduce capacitive coupling. The exposed pad of the SOIC package is internally connected to VSS; no thermal pad soldering is required for the SOIC variant.
When using the Parallel Master Port (PMP) for graphics or external memory, place series 22 ohm resistors near the MCU output pins to dampen reflections on traces longer than 50 mm. The 10-bit ADC inputs (AN0-AN15) require a 10 kHz or lower source impedance to avoid conversion errors; add an op-amp buffer if the sensor impedance exceeds this limit.
Do not leave the MCLR pin floating; tie it to VDD through a 10 kohm pull-up and add a 100 nF capacitor to ground for noise immunity. Programming fails are commonly caused by missing the ICSP pull-down on PGECx or incorrect oscillator configuration bits - always set the Configuration Words in the IDE before generating the HEX file. Do not exceed 3.6 V on any I/O pin even in open-drain mode.
Route the 8 MHz primary oscillator traces symmetrically with grounded guard traces for noise immunity. Estimated: with a 2-layer FR4 board and standard 1 oz copper, the SOIC-28 thermal pad-free package dissipates up to 400 mW at 72 MHz with all peripherals active. Provide at least 100 mm squared of copper pour connected to VSS for thermal relief in industrial environments.
Compliance Information
RoHS compliant and Pb-free per Microchip product page and LCSC distributor listing. Not AEC-Q100 qualified - choose PIC32MX154F128B-V/SO automotive variant or PIC32MX1xx AEC-Q100 series for automotive applications.
