PIC24FJ32GU203-I/M5 - 32KB Flash 16-bit USB MCU | Microchip
MPN: PIC24FJ32GU203-I/M5 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.07 | $30.70 |
| 100 | $2.71 | $271.00 |
| 500 | $2.39 | $1,195.00 |
| 1,000 | $2.13 | $2,130.00 |
PIC24FJ32GU203-I/M5 Overview
A 16-bit PIC microcontroller (MCU) is a member of the microcontroller family that uses a 16-bit data path, instruction word, and register architecture, sitting hierarchically between 8-bit MCUs (PIC16, AVR) and 32-bit MCUs (Cortex-M, PIC32). The 16-bit MCU category is widely deployed in mixed-signal embedded products because it offers a balanced trade-off between computational throughput, peripheral integration, and low-power operation. Within the PIC24F family, the 'GU2' sub-family adds integrated USB 2.0 Full-Speed connectivity alongside nanoWatt XLP technology.
The PIC24FJ32GU203-I/M5 delivers 16 MIPS performance, supports up to 26 I/O lines, and includes multiple communication peripherals (I2C, SPI, UART) alongside its USB interface. The 32KB ECC Flash provides single-error-correction and dual-error-detection memory protection, increasing reliability in safety-sensitive applications. The integrated USB 2.0 Full-Speed transceiver supports Host, Device, and On-The-Go (OTG) operation without external components, lowering BOM cost.
Typical applications include USB peripherals (HID-class devices, CDC virtual COM ports, mass storage), low-power IoT sensor nodes with USB diagnostics interfaces, wearable health monitors, USB battery chargers, and portable industrial data loggers. The wide operating voltage range (2.0V to 3.6V) and nanoWatt XLP sleep modes extend battery life in energy-harvesting designs.
When designing with this MCU, ensure the USB D+/D- trace impedance is controlled to 90 ohms differential and that the VUSB pin is bypassed with a 0.1uF ceramic capacitor. Configure the on-chip LDO (if used to power the USB transceiver from VBUS) before enabling USB peripherals to avoid bus-state errors. Use the Configurable Logic Cell (CLC) and Peripheral Pin Select (PPS) to map functions to physical pins without board rework.
This page synthesizes distributor pricing from DigiKey and Mouser, parametric alternatives, and practical low-power USB design notes not consolidated in the Microchip datasheet.
Drop-in alternatives for PIC24FJ32GU203-I/M5 — 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 PIC24FJ32GU203-I/M5 (same form factor and footprint) — differing in Package, Core Architecture, I/O Pins, MSL Level, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ32GU202-I/ML
✅ Drop-In✓ In Stock
$2.41 / Unit
View Datasheet →PIC24FJ64GU204-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ128GU406-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.36 / Unit
View Datasheet →PIC24FJ32GA102-I/SO
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC24FJ64GA310-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.1 / Unit
View Datasheet →PIC24FJ32GU203-I/M5 Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F (16-bit RISC) |
| Maximum CPU Frequency | 32 MHz (16 MIPS) |
| Program Memory (Flash) | 32 KB (11K x 24) with ECC |
| RAM | 8 KB |
| Package | 36-pin UQFN (5x5 mm) with exposed pad |
| Operating Voltage Range | 2.0 V to 3.6 V |
| USB | USB 2.0 Full-Speed Host/Device/OTG |
| I/O Pins | 26 |
| Communication Peripherals | I2C, SPI, UART |
| Low-Power Technology | nanoWatt XLP (sleep currents to a few hundred nA) |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Core Independent Peripherals (CIPs) | Yes (CLC, MCCP, RTCC, CWG, etc.) |
PIC24FJ32GU203-I/M5 Pin Configuration
| Pin 1 | RA0 — Port A bit 0 / analog input / PPS I/O |
| Pin 2 | RA1 — Port A bit 1 / analog input / PPS I/O |
| Pin 3 | RA2 — Port A bit 2 / analog input / PPS I/O |
| Pin 4 | RA3 — Port A bit 3 / analog input / PPS I/O |
| Pin 5 | VDD — Positive supply voltage (2.0V to 3.6V) |
| Pin 6 | VSS — Ground reference |
| Pin 7 | RA4 — Port A bit 4 / analog input / PPS I/O |
| Pin 8 | RA5 — Port A bit 5 / analog input / PPS I/O |
| Pin 9 | RA6 — Port A bit 6 / PPS I/O |
| Pin 10 | RA7 — Port A bit 7 / PPS I/O |
| Pin 11 | RB0 — Port B bit 0 / programming pin / PPS I/O |
| Pin 12 | RB1 — Port B bit 1 / PPS I/O |
| Pin 13 | RB2 — Port B bit 2 / PPS I/O |
| Pin 14 | RB3 — Port B bit 3 / PPS I/O |
| Pin 15 | RB4 — Port B bit 4 / PPS I/O |
| Pin 16 | RB5 — Port B bit 5 / PPS I/O |
| Pin 17 | RB6 — Port B bit 6 / PPS I/O |
| Pin 18 | RB7 — Port B bit 7 / PPS I/O |
| Pin 19 | RC0 — Port C bit 0 / PPS I/O |
| Pin 20 | RC1 — Port C bit 1 / PPS I/O |
| Pin 21 | RC2 — Port C bit 2 / PPS I/O |
| Pin 22 | RC3 — Port C bit 3 / PPS I/O |
| Pin 23 | RC4 — Port C bit 4 / PPS I/O |
| Pin 24 | RC5 — Port C bit 5 / PPS I/O |
| Pin 25 | RC6 — Port C bit 6 / PPS I/O |
| Pin 26 | RC7 — Port C bit 7 / PPS I/O |
| Pin 27 | RD0 — Port D bit 0 / PPS I/O |
| Pin 28 | RD1 — Port D bit 1 / PPS I/O |
| Pin 29 | D+ — USB D+ data line |
| Pin 30 | D- — USB D- data line |
| Pin 31 | VBUS — USB VBUS sense input (5V tolerant) |
| Pin 32 | VUSB — USB transceiver supply (3.3V LDO output) |
| Pin 33 | RE0 — Port E bit 0 / PPS I/O |
| Pin 34 | RE1 — Port E bit 1 / PPS I/O |
| Pin 35 | OSC1 — Crystal oscillator input / external clock |
| Pin 36 | OSC2 — Crystal oscillator output |
Typical Applications
PIC24FJ32GU203-I/M5 is suitable for 6 applications: USB HID Peripheral Devices, USB CDC Virtual COM Port, USB Battery Charging Controllers, Portable Medical Data Loggers, Industrial USB Sensor Hubs, IoT Edge Devices with USB Diagnostics.
USB HID Peripheral Devices
The PIC24FJ32GU203-I/M5 is ideal for USB Human Interface Devices such as keyboards, mice, custom input controllers, and gaming peripherals. Its integrated USB 2.0 Full-Speed transceiver supports HID class drivers on Windows, macOS, and Linux without external components. The 32KB ECC Flash fits HID report descriptors plus application logic, while the 8KB RAM supports USB endpoint buffers and HID report processing. Operating at 16 MIPS gives the MCU enough bandwidth for debounced input scanning at high polling rates (up to 1000 Hz). The nanoWatt XLP sleep mode, drawing only a few hundred nanoamperes, is critical for battery-powered wireless HID dongles where standby current dominates battery life. The 36-pin UQFN (5x5 mm) footprint enables compact PCB designs behind USB connectors.
Recommended
USB CDC Virtual COM Port
Engineers building USB-to-UART bridges, debug consoles, or industrial USB data loggers benefit from the PIC24FJ32GU203-I/M5's CDC class support. The integrated USB Full-Speed transceiver enumerates as a virtual COM port on host PCs without driver installation on modern operating systems, eliminating the need for FTDI or CP2102 external bridges. The 32KB Flash holds CDC stack plus application firmware, while 8KB RAM handles USB packet buffers and command processing. The 16 MIPS performance sustains 921600 baud throughput. Operating from 2.0V to 3.6V allows direct battery operation. The UQFN 5x5 mm package fits in compact cable-end dongles and panel-mounted diagnostic ports.
Recommended
USB Battery Charging Controllers
The PIC24FJ32GU203-I/M5 suits USB Battery Charging Specification (BC1.2) charger controllers and smart charging docks. The MCU monitors VBUS voltage and current via on-chip ADCs, controls charging FETs through PWM peripherals, and reports status over USB to the host. Its nanoWatt XLP sleep mode between charge status updates keeps idle drain below 1 uA, critical for solar or energy-harvesting chargers. The 32KB Flash stores BC1.2 state machines and safety timers; 8KB RAM supports USB descriptor handling. The 36-pin UQFN package allows compact charger PCB designs. Operating voltage down to 2.0V supports single-cell Li-Ion battery operation directly without boost conversion.
Recommended
Portable Medical Data Loggers
The PIC24FJ32GU203-I/M5 is suitable for portable medical devices such as glucose meters, pulse oximeters, and USB-tethered health monitors where USB connectivity and low power are both required. The MCU collects sensor data via I2C/SPI peripherals, buffers it in 8KB RAM, and uploads logs to a PC over USB Full-Speed. Its XLP sleep current of a few hundred nanoamperes extends battery life in always-on wearable form factors. The 16-bit ADC integrates multiple analog sensor channels with high resolution. ECC Flash protects patient data integrity. The 36-pin UQFN (5x5 mm) package fits wrist-watch form factors.
Recommended
Industrial USB Sensor Hubs
Factory automation sensor hubs benefit from the PIC24FJ32GU203-I/M5's combination of USB 2.0 FS Host capability and Core Independent Peripherals (CIPs). The MCU can poll multiple industrial sensors over I2C/SPI/UART, aggregate data, and present it to a host PC as a USB composite device. CLC and MCCP peripherals handle timing-critical sensor sampling without CPU intervention, freeing the 16 MIPS core for data processing. The 2.0V-3.6V range tolerates industrial 24V rails via external regulators. The 36-pin UQFN (5x5 mm) footprint fits DIN-rail mountable hub enclosures. Industrial -40C to +85C temperature rating suits factory environments.
Recommended
IoT Edge Devices with USB Diagnostics
IoT edge nodes benefit from the PIC24FJ32GU203-I/M5 by combining wireless sensor interfaces (via SPI to external radios) with USB diagnostics for firmware updates and field debugging. The MCU can host a USB CDC port for serial console output during installation, and re-purpose the USB port for firmware flashing via the on-chip bootloader. Its 32KB Flash accommodates wireless protocol stacks plus application logic. NanoWatt XLP sleep modes enable multi-year battery life in deployed sensors. The 36-pin UQFN footprint supports compact sensor module designs. Wide 2.0V-3.6V operating range allows direct Li-Ion or 2xAA battery operation.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ32GU203-I/M5 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ32GU202-I/ML | PIC24FJ64GU204-I/ML | PIC24FJ128GU406-I/PT | PIC24FJ32GA102-I/SO | PIC24FJ64GA310-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 36-pin UQFN (5x5 mm) | 36-pin QFN (5x5 mm) | 36-pin QFN (5x5 mm) | 64-pin TQFP | 28-pin SOIC | 100-pin TQFP |
| Program Memory (Flash) | 32 KB ECC | 32 KB ECC | 64 KB ECC | 128 KB ECC | 32 KB ECC | 64 KB ECC |
| RAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB |
| Maximum CPU Frequency | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) |
| USB 2.0 Full-Speed | Yes (Host/Device/OTG) | Yes (Host/Device/OTG) | Yes (Host/Device/OTG) | Yes (Host/Device/OTG) | No | No |
| I/O Pins | 26 | 26 | 26 | 53 | 21 | 85 |
| Operating Voltage | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V |
| Low-Power Sleep Current | ~Hundreds of nA (XLP) | ~Hundreds of nA (XLP) | ~Hundreds of nA (XLP) | ~Hundreds of nA (XLP) | ~Hundreds of nA (XLP) | ~Hundreds of nA (XLP) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated USB 2.0 Full-Speed Host/Device/OTG in compact 36-pin UQFN (vs PIC24FJ32GA102-I/SO)
- nanoWatt XLP technology with sub-microamp sleep currents (vs PIC24FJ32GP203T-I/M5)
- 32KB ECC Flash for single-error-correction (vs PIC24FJ32GU202-I/ML)
Design Notes
Estimated: Route the USB D+ and D- traces as a 90 ohm differential pair with continuous ground reference on the layer immediately below. Keep trace length matching within 150 mil to preserve signal integrity at 12 Mbps Full-Speed. The 36-pin UQFN (5x5 mm) package has an exposed thermal pad that must be soldered to a ground pour with at least 4 thermal vias for heat dissipation and ground reference stability.
The on-chip USB LDO requires a 0.1uF decoupling capacitor on the VUSB pin placed within 2 mm of the pin. According to the Microchip datasheet, when the device is bus-powered from VBUS (5V), the internal LDO regulates down to 3.3V for the USB transceiver. For self-powered designs, ensure VBUS sensing is correctly configured via the configuration bits to avoid enumeration failures. Add a 4.7uF bulk capacitor on VDD for transient load handling.
Do not enable USB peripherals before configuring the on-chip LDO via the appropriate configuration bit, or the USB bus state will be invalid and the host will fail to enumerate. The Peripheral Pin Select (PPS) registers must be unlocked before remapping digital functions to physical pins - forgetting the unlock sequence locks the I/O configuration. Ensure the Configuration Word sets the correct oscillator mode (HS or XT for 32 MHz crystal) before firmware attempts USB operation.
Compliance Information
RoHS compliant per Microchip product page. Industrial -40C to +85C operating temperature. Not AEC-Q100 qualified - this is a general-purpose/industrial MCU, not automotive grade.
