PIC24FJ64GU205-I/M4 - 16-bit USB MCU, 64KB Flash, 48-UQFN | Microchip
MPN: PIC24FJ64GU205-I/M4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.61 | $36.10 |
| 100 | $3.18 | $318.00 |
| 500 | $2.78 | $1,390.00 |
| 1,000 | $2.45 | $2,450.00 |
PIC24FJ64GU205-I/M4 Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM), peripherals, and I/O. The PIC24F family uses a 16-bit modified Harvard architecture with single-cycle instruction execution, providing higher code density and throughput than typical 8-bit MCUs while retaining low power consumption. Within Microchip's portfolio, the PIC24FJ GU2 sub-family is positioned for low-pin-count USB applications such as human-interface devices, portable instrumentation, and consumer peripherals.
Key features include eXtreme Low-Power (XLP) technology with multiple power-saving modes (Sleep, Deep Sleep, Retention), a 16-channel 10-bit ADC, multiple communication peripherals (UART, SPI, I2C), and four 16-bit timers. The integrated USB 2.0 Full-Speed device with on-chip transceiver eliminates external PHY components, reducing BOM cost and PCB area. The device operates from 2.0V to 3.6V across an industrial -40C to +85C temperature range, with 38 available I/O pins for user applications.
Architecturally, the PIC24FJ64GU205 uses Microchip's nanoWatt XLP design methodology, achieving currents under 1 uA in Deep Sleep while retaining RAM. The 16-bit datapath, 24-bit instruction word, and hardware multiply/divide make it well-suited to DSP-like filtering on sensor data without offloading to a DSP.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), portable medical accessories, low-power wireless sensor nodes, USB-to-UART bridges, and consumer electronics with USB charging monitoring. The combination of USB, low power, and small footprint makes it attractive for wearable and battery-powered products.
Design considerations include careful USB PCB layout (90-ohm differential impedance on D+/D-, common-mode choke, ESD protection), decoupling capacitor placement, and use of the on-chip 8 MHz internal oscillator with PLL to minimize external components. Migration between package options (UQFN-48, TQFP-48, QFN-48) within the family is supported through pin-compatible variants.
This page synthesizes authorized distributor pricing, drop-in compatible alternatives within the PIC24FJ family, and practical USB layout guidance not always covered in the datasheet.
Drop-in alternatives for PIC24FJ64GU205-I/M4 — 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 PIC24FJ64GU205-I/M4 (same form factor and footprint) — differing in ADC, Operating Temperature, Core Architecture, Timers, USB.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ64GP205-I/M4
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC24FJ32GU205-E/M4
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.55 / Unit
View Datasheet →PIC24FJ64GU205-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.02 / Unit
View Datasheet →PIC24FJ128GU405-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.25 / Unit
View Datasheet →PIC24FJ64GU205-I/M4 Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F (16-bit modified Harvard) |
| Family | PIC24FJ GU2 / GP2 |
| Program Memory (Flash) | 64 KB (22K x 24) with ECC |
| RAM | 8 KB |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Operating Voltage Range | 2.0 V to 3.6 V |
| Operating Temperature Range | -40C to +85C (Industrial) |
| I/O Pins | 38 |
| USB Controller | USB 2.0 Full-Speed Device with on-chip transceiver |
| ADC | 10-bit, up to 16 channels |
| Timers | 4 x 16-bit |
| Communication Interfaces | UART, SPI, I2C |
| Low-Power Modes | XLP Sleep, Deep Sleep, Retention |
| Package | 48-pin UQFN (6x6 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC24FJ64GU205-I/M4 Pin Configuration
| Pin 1 | RB0 — PORTB I/O pin 0 |
| Pin 2 | RB1 — PORTB I/O pin 1 |
| Pin 3 | RB2 — PORTB I/O pin 2 |
| Pin 4 | RB3 — PORTB I/O pin 3 |
| Pin 5 | VSS — Ground |
| Pin 6 | RC0 — PORTC I/O pin 0 |
| Pin 7 | RC1 — PORTC I/O pin 1 |
| Pin 8 | RC2 — PORTC I/O pin 2 |
| Pin 9 | RC3 — PORTC I/O pin 3 |
| Pin 10 | RC4 — PORTC I/O pin 4 |
| Pin 11 | RC5 — PORTC I/O pin 5 |
| Pin 12 | RC7 — PORTC I/O pin 7 |
| Pin 13 | RC6 — PORTC I/O pin 6 / USB D+ |
| Pin 14 | RC8 — PORTC I/O pin 8 / USB D- |
| Pin 15 | RC9 — PORTC I/O pin 9 |
| Pin 16 | VSS — Ground |
| Pin 17 | VDD — Positive supply voltage |
| Pin 18 | RA0 — PORTA I/O pin 0 |
| Pin 19 | RA1 — PORTA I/O pin 1 |
| Pin 20 | RA2 — PORTA I/O pin 2 |
| Pin 21 | RA3 — PORTA I/O pin 3 |
| Pin 22 | RA4 — PORTA I/O pin 4 |
| Pin 23 | RA5 — PORTA I/O pin 5 |
| Pin 24 | RA6 — PORTA I/O pin 6 |
| Pin 25 | RA7 — PORTA I/O pin 7 |
| Pin 26 | RB4 — PORTB I/O pin 4 |
| Pin 27 | RB5 — PORTB I/O pin 5 |
| Pin 28 | RB6 — PORTB I/O pin 6 |
| Pin 29 | RB7 — PORTB I/O pin 7 |
| Pin 30 | RB8 — PORTB I/O pin 8 |
| Pin 31 | RB9 — PORTB I/O pin 9 |
| Pin 32 | RB10 — PORTB I/O pin 10 |
| Pin 33 | RB11 — PORTB I/O pin 11 |
| Pin 34 | RB12 — PORTB I/O pin 12 |
| Pin 35 | RB13 — PORTB I/O pin 13 |
| Pin 36 | RB14 — PORTB I/O pin 14 |
| Pin 37 | RB15 — PORTB I/O pin 15 |
| Pin 38 | VDD — Positive supply voltage |
| Pin 39 | VSS — Ground |
| Pin 40 | OSCI — Oscillator input |
| Pin 41 | OSCO — Oscillator output |
| Pin 42 | MCLR — Master clear (reset) input |
| Pin 43 | PGED1 — Programming data I/O |
| Pin 44 | PGEC1 — Programming clock input |
| Pin 45 | VDD — Positive supply voltage |
| Pin 46 | VSS — Ground |
| Pin 47 | VBUS — USB VBUS detect input |
| Pin 48 | VDDUSB — USB internal transceiver supply |
Typical Applications
PIC24FJ64GU205-I/M4 is suitable for 7 applications: USB HID Peripherals, Portable Medical Accessories, USB-to-UART Bridge, Consumer USB Charging Monitor, Low-Power Wireless Sensor Nodes, Wearables and Fitness Bands, Industrial USB Sensor Interfaces.
USB HID Peripherals
The PIC24FJ64GU205-I/M4 is purpose-suited for USB HID-class peripherals such as keyboards, mice, game controllers, and custom input devices. Its integrated USB 2.0 Full-Speed device controller with on-chip transceiver eliminates external PHY components, reducing BOM cost by approximately $0.50 to $1.00 per unit compared to MCU + external PHY solutions. With 64 KB Flash and 8 KB RAM, the device comfortably fits HID report descriptors, debounce logic, and composite device stacks. The 16 MIPS performance at 32 MHz handles polling rates up to 1000 Hz without CPU loading.
Recommended
Portable Medical Accessories
The PIC24FJ64GU205-I/M4 fits portable medical accessories such as glucose meters, pulse oximeters, and USB-charged diagnostic tools. Its XLP low-power modes deliver currents below 1 uA in Deep Sleep with RAM retention, enabling months of battery life on coin cells in duty-cycled measurement applications. The 10-bit ADC with up to 16 channels supports multi-sensor acquisition, while USB connectivity enables direct data upload to clinical software. The 2.0V minimum supply allows single-cell lithium battery operation with no boost converter.
Recommended
USB-to-UART Bridge
The PIC24FJ64GU205-I/M4 is ideal for USB-to-UART bridge dongles that replace legacy RS-232 connections in industrial and embedded development tools. The integrated USB Full-Speed device and multiple UART peripherals enable CDC-ACM class bridges with baud rates up to 921600 without external crystals. The 64 KB Flash holds full USB CDC stack plus vendor-specific commands for JTAG or I2C tunneling. The 48-UQFN (6x6 mm) package fits into compact dongle form factors commonly used in development kits.
Recommended
Consumer USB Charging Monitor
The PIC24FJ64GU205-I/M4 enables USB charging monitors and protocol analyzers for consumer electronics and test equipment. The on-chip USB transceiver, ADC, and 64 KB Flash support real-time monitoring of VBUS voltage, D+/D- BC 1.2 handshakes, and proprietary quick-charge protocols. The PIC24F core's 16-bit datapath efficiently processes sampled voltage and current data without taxing the CPU, allowing logging to internal Flash at high sample rates.
Recommended
Low-Power Wireless Sensor Nodes
The PIC24FJ64GU205-I/M4 serves as the host MCU in low-power wireless sensor nodes using modules like the MRF24J40 or external sub-GHz transceivers. Its XLP architecture with under-1-uA Deep Sleep current extends battery life to years in duty-cycled IoT deployments where the radio wakes only briefly every few seconds. SPI and UART peripherals directly interface common wireless modules, while USB enables field firmware updates and configuration without separate programming headers.
Recommended
Wearables and Fitness Bands
The PIC24FJ64GU205-I/M4 is well-suited for wearable fitness bands and watches that require USB charging and data sync without compromising battery life. Its 2.0V minimum supply supports single-cell lithium polymer batteries, and XLP modes keep quiescent current under 1 uA during idle periods. The integrated USB simplifies charging cradle designs, while the 38 GPIO pins can drive small OLED displays, accelerometers via I2C, and haptic feedback motors. The small 6x6 mm UQFN package fits into slim wearable enclosures.
Recommended
Industrial USB Sensor Interfaces
The PIC24FJ64GU205-I/M4 supports industrial sensor-to-USB interfaces for factory automation and process monitoring. Its -40C to +85C industrial temperature range and 38 GPIO allow direct connection to multiple 4-20 mA loops, digital sensors, and isolated UART lines via SPI/I2C expanders. The integrated USB enables plug-and-play connection to SCADA systems without proprietary drivers. ECC Flash protects against bit flips in electrically noisy industrial environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ64GU205-I/M4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ64GP205-I/M4 | PIC24FJ32GU205-E/M4 | PIC24FJ64GU205-I/PT | PIC24FJ128GU405-I/PT |
|---|---|---|---|---|---|
| Package | 48-UQFN (6x6) | 48-UQFN (6x6) - same | 48-UQFN (6x6) - same | 48-TQFP - different | 48-TQFP - different |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Flash Memory | 64 KB ECC | 64 KB ECC | 32 KB ECC | 64 KB ECC | 128 KB ECC |
| RAM | 8 KB | 8 KB | 4 KB | 8 KB | 32 KB |
| USB Controller | Yes (Full-Speed, on-chip PHY) | No | Yes (Full-Speed, on-chip PHY) | Yes (Full-Speed, on-chip PHY) | Yes (Full-Speed, on-chip PHY) |
| CPU Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| I/O Pins | 38 | 38 | 38 | 38 | 38 |
Key Differentiators
- Integrated USB Full-Speed with on-chip transceiver eliminates external PHY (vs PIC24FJ64GP205-I/M4)
- Smallest package option in PIC24FJ GU2 family at 6x6 mm (vs PIC24FJ128GU405-I/PT)
- eXtreme Low-Power (XLP) Deep Sleep below 1 uA (vs PIC24FJ32GU205-E/M4)
Design Notes
USB D+/D- traces must be routed as a 90-ohm differential pair with controlled impedance, length-matched within 150 mil, and kept away from high-frequency switching nodes. Place a common-mode choke (such as DLW21SN) close to the USB connector, and add ESD protection (USBLC6-2SC6) at the connector. Maintain a continuous ground reference beneath the differential pair and avoid splitting the ground plane under USB traces. The VBUS pin requires a 1 uF + 100 nF decoupling network and a voltage divider to step down 5V VBUS to a 3.3V-tolerant GPIO.
Decouple each VDD pin with a 100 nF ceramic capacitor placed within 3 mm of the pin, plus a bulk 4.7 uF or 10 uF capacitor on the main supply rail. The VDDUSB pin powering the internal USB transceiver requires its own 100 nF + 4.7 uF decoupling network to meet USB impedance specifications. Place the bulk capacitor on the same side of the PCB as the MCU to minimize inductance. For battery-powered designs, use the MCP1700 or MCP1810 LDO rather than a switching regulator to avoid noise coupling into the USB analog circuits.
Three common pitfalls: (1) Failing to enable the USB module's on-chip pull-up on D+ via the UPUEN bit in the U1CNFG2 register - USB enumeration will silently fail without this. (2) Using the internal 8 MHz oscillator without engaging the PLL for USB - the USB module requires a 48 MHz clock derived from a precisely tuned source; off-frequency USB clocks cause enumeration failures. (3) Neglecting to configure the VBUS pin for sensing; without VBUS detect, the device cannot wake from sleep on USB attach. Always check silicon errata DS80000496 for known USB-specific anomalies.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified (this is a general-purpose MCU, not automotive-grade). Use PIC24FJ64GU205-I/M4VAO or automotive-designated variants for AEC-Q100 applications.
