PIC24FJ64GU202T-I/SO - 16-bit 32MHz USB MCU, 64KB Flash | Microchip
MPN: PIC24FJ64GU202T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.15 | $41.50 |
| 100 | $3.69 | $369.00 |
| 500 | $3.31 | $1,655.00 |
| 1,000 | $2.95 | $2,950.00 |
PIC24FJ64GU202T-I/SO Overview
A 16-bit microcontroller (MCU) is a programmable logic device with a 16-bit data path and instruction word that sits between simple 8-bit microcontrollers and full 32-bit ARM Cortex-M parts. The PIC24F sits in the broader hierarchy of microcontroller -> embedded controller -> semiconductor, where it offers more computational headroom, larger memory, and richer peripherals than 8-bit parts at the cost of slightly larger silicon and more sophisticated power sequencing. The PIC24FJ64GU202 is part of Microchip's 'GP2/GU2' sub-family, distinguished by its integrated USB 2.0 transceiver, hardware crypto engine on select variants, and a wide 2.0 V to 3.6 V VDD range that simplifies single-cell Li-ion and two-AA designs.
Key differentiating features include 20 general-purpose I/O pins grouped across multiple ports, a 10-bit ADC with multiple conversion trigger sources, multiple UART/SPI/I2C peripherals, hardware RTCC, and Configurable Logic Cells (CLC) that implement glue logic in firmware-free hardware. The CLCs, 16-bit PWM, and quadrature encoder interface free the CPU from bit-banging tasks, a hallmark of the 'Core Independent Peripherals' (CIPs) philosophy.
Technically, the GU2 family uses a 16-bit modified Harvard CPU with 32 MHz oscillator and a 2-cycle system clock, paired with on-chip FRC accuracy suitable for USB without an external crystal in some configurations. The integrated USB 2.0 Full-Speed transceiver supplies Host, Device, and OTG roles, with internal pull-up/pull-down resistors configurable in firmware. The CIPs - including CLC, MCCP, 16-bit PWM, and 32-bit CRC - run without CPU intervention, freeing MIPS for application code.
Typical applications include USB HID peripherals (keyboards, mice, custom HID), USB-to-UART bridges, USB charging controllers with host mode, low-power sensor data loggers, and portable medical or industrial instrumentation that benefits from XLP nanoamp sleep current. The 28-SOIC footprint supports hand-solderable prototypes and through-hole-friendly DFA.
When designing with this part, pay attention to VDD-VUSB supply topology: the USB transceiver requires a regulated 3.3 V, and decoupling must follow Microchip's 28-pin SOIC reference layout to pass USB-IF compliance. The XLP deep-sleep mode requires all wake sources to be re-armed on every wake cycle - firmware state machines should be designed around the Sleep/Wake peripheral library.
This page synthesizes distributor pricing across DigiKey and Mouser, drop-in same-family alternatives in the same 28-SOIC footprint, and practical design notes not collocated in the manufacturer datasheet.
Drop-in alternatives for PIC24FJ64GU202T-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 PIC24FJ64GU202T-I/SO (same form factor and footprint) — differing in Package, ADC, Operating Temperature, MSL Level, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ64GU202-I/SO
✅ Drop-In✓ In Stock
$1.76 / Unit
View Datasheet →PIC24FJ64GU202-I/SS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.52 / Unit
View Datasheet →PIC24FJ64GU202T-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ64GB202T-I/SO
✅ Drop-In✓ In Stock
$2.69 / Unit
View Datasheet →PIC24FJ32GU202T-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.62 / Unit
View Datasheet →PIC24FJ64GA702T-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.14 / Unit
View Datasheet →PIC24FJ64GU202T-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC24F 16-bit |
| Architecture | Modified Harvard |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Program Flash | 64 KB (22K x 24) with ECC |
| SRAM | 8 KB |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| USB | USB 2.0 Full-Speed Host/Device/OTG |
| I/O Pins | 20 |
| Package | 28-pin SOIC |
| Operating Temperature | -40C to +85C (industrial, /I suffix) |
| ADC | 10-bit SAR |
| Communication | UART, SPI, I2C |
| PWM Channels | Multiple 16-bit |
| Timers | Multiple 16-bit with RTCC |
| Core Independent Peripherals (CIPs) | CLC, MCCP, 32-bit CRC, configurable logic |
| Sleep Current (XLP) | Few hundred nA with RAM retention |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | MSL1 |
| ECC Support | Yes (Flash ECC) |
PIC24FJ64GU202T-I/SO Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active-low |
| Pin 2 | RA0 — Port A bit 0 / analog input |
| Pin 3 | RA1 — Port A bit 1 / analog input |
| Pin 4 | RP4/RB4 — Remappable peripheral pin / Port B bit 4 |
| Pin 5 | VDD — Positive supply voltage (2.0 V to 3.6 V) |
| Pin 6 | VSS — Ground reference |
| Pin 7 | OSCI/CLKI/RA2 — Crystal oscillator input or external clock |
| Pin 8 | OSCO/CLKO/RA3 — Crystal oscillator output |
| Pin 9 | D+ — USB D+ data line |
| Pin 10 | D- — USB D- data line |
| Pin 11 | VBUS — USB VBUS sense input |
| Pin 12 | VUSB — USB transceiver supply (3.3 V regulated) |
| Pin 13 | RP9/RB9 — Remappable peripheral pin / Port B bit 9 |
| Pin 14 | RP10/RB10 — Remappable peripheral pin / Port B bit 10 |
| Pin 15 | RP11/RB11 — Remappable peripheral pin / Port B bit 11 |
| Pin 16 | VSS — Ground reference |
| Pin 17 | VDD — Positive supply voltage (2.0 V to 3.6 V) |
| Pin 18 | RP12/RB12 — Remappable peripheral pin / Port B bit 12 |
| Pin 19 | RP13/RB13 — Remappable peripheral pin / Port B bit 13 |
| Pin 20 | PGED3/RB0 — Programming data / Port B bit 0 |
| Pin 21 | PGEC3/RB1 — Programming clock / Port B bit 1 |
| Pin 22 | RP1/RB1 — Remappable peripheral pin / Port B bit 1 |
| Pin 23 | RP2/RB2 — Remappable peripheral pin / Port B bit 2 |
| Pin 24 | RP3/RB3 — Remappable peripheral pin / Port B bit 3 |
| Pin 25 | RA4 — Port A bit 4 |
| Pin 26 | RA5 — Port A bit 5 |
| Pin 27 | RA6 — Port A bit 6 |
| Pin 28 | RA7 — Port A bit 7 |
Typical Applications
PIC24FJ64GU202T-I/SO is suitable for 6 applications: USB HID Peripheral (Keyboard/Mouse/Custom HID), USB-to-UART Bridge and Serial Adapter, Low-Power Sensor Data Logger, Industrial USB Instrumentation Front-End, Portable Medical and Wellness Device, USB Charging Controller with Host Mode.
USB HID Peripheral (Keyboard/Mouse/Custom HID)
The PIC24FJ64GU202T-I/SO's integrated USB 2.0 Full-Speed transceiver supporting Host, Device, and On-The-Go roles makes it a natural fit for USB Human Interface Device peripherals such as keyboards, mice, game controllers, and custom HID devices. The 16 MIPS CPU easily services USB interrupt endpoints while still running key-scanning or sensor-fusion firmware. With 64 KB of ECC Flash and 8 KB of SRAM, designers can embed USB stacks plus application code without external memory. The XLP sleep mode dropping current to a few hundred nanoamps extends battery life in wireless HID peripherals - critical for multi-year coin-cell designs where every microamp counts.
Recommended
USB-to-UART Bridge and Serial Adapter
The PIC24FJ64GU202T-I/SO's USB 2.0 Device mode plus dual UART peripherals make it ideal for USB-to-serial bridge designs replacing legacy RS-232 ports on laptops. The internal FRC oscillator is accurate enough for USB Full-Speed signaling without an external crystal in many configurations, simplifying BOM. The 8 KB SRAM buffers full-speed UART traffic at 921600 baud with headroom for protocol translation. The 28-SOIC package fits hand-solderable prototypes. XLP sleep modes let the bridge drop to nanoamp idle when no UART activity is detected, useful for solar-powered IoT gateways.
Recommended
Low-Power Sensor Data Logger
The PIC24FJ64GU202T-I/SO's eXtreme Low Power technology - sleep current down to a few hundred nanoamps with full SRAM and interrupt context retention - enables multi-year battery life on coin cells, making it ideal for environmental sensor loggers, asset trackers, and remote monitoring nodes. The 10-bit ADC samples temperature, humidity, or analog sensors while the CPU stays asleep until threshold-crossing interrupts wake it. The 64 KB Flash stores months of timestamped readings with the hardware 32-bit CRC validating each block. The 8 KB SRAM buffers raw sensor bursts before flash commit, avoiding wear from frequent small writes.
Recommended
Industrial USB Instrumentation Front-End
The PIC24FJ64GU202T-I/SO's industrial -40C to +85C temperature range, ECC Flash, and USB Host mode (for connecting USB test instruments) suit industrial process-control front-ends and USB data-acquisition modules. Core Independent Peripherals like Configurable Logic Cells (CLC) and 16-bit PWM offload bit-banging tasks from the CPU, freeing 16 MIPS for protocol parsing. The dual UART and SPI peripherals interface to RS-485 transceivers and ADC front-ends, while USB Host mode can read external USB flash drives for data export. ECC Flash protects against soft errors from EMI common on factory floors.
Recommended
Portable Medical and Wellness Device
The PIC24FJ64GU202T-I/SO's XLP nanoamp sleep modes, integrated USB for charging and data sync, and wide 2.0 V to 3.6 V supply range support portable medical devices such as blood-pressure monitors, pulse oximeters, and digital thermometers. The 10-bit ADC reads sensor analog signals with 1 mV resolution, sufficient for vital-sign measurements. Hardware encryption and ECC Flash protect patient data integrity on the device. The 28-SOIC package fits into slim handheld enclosures. Designers can run USB Device mode for charging/data sync and UART/SPI for sensor interfaces from the same chip.
Recommended
USB Charging Controller with Host Mode
The PIC24FJ64GU202T-I/SO's USB 2.0 Host mode with VBUS drive capability and OTG role switching supports USB charging controllers, USB battery packs, and embedded host peripherals that negotiate charging current with attached devices. The 16 MIPS CPU runs USB Host stack plus battery-monitoring firmware. Multiple PWM channels drive LED status indicators and buck-boost converter control loops. ECC Flash prevents firmware corruption that could brick a $20K medical cart. The 8 KB SRAM handles USB Host enumeration tables for connected devices.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ64GU202T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ64GU202-I/SO | PIC24FJ64GU202T-E/SO | PIC24FJ64GB202T-I/SO | PIC24FJ32GU202T-I/ML | PIC24FJ64GA702T-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-QFN - different | 28-SOIC - same |
| Flash | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB | 64 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| USB | USB 2.0 FS Host/Device/OTG | USB 2.0 FS Host/Device/OTG | USB 2.0 FS Host/Device/OTG | No USB | USB 2.0 FS Host/Device/OTG | No USB |
| CPU Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| Operating Temp | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +125C (extended) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Supply 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 | 2.0 V to 3.6 V |
Key Differentiators
- Integrated USB 2.0 Full-Speed Host/Device/OTG with on-chip transceiver (vs PIC24FJ64GB202T-I/SO)
- Extended temperature option available for harsh environments (vs PIC24FJ64GU202T-E/SO)
- eXtreme Low Power sleep to a few hundred nanoamps with full RAM retention (vs PIC24FJ64GA702T-I/SO)
Design Notes
The USB transceiver requires a regulated 3.0 V to 3.6 V supply on the VUSB pin even when USB is not in use, because leakage through D+/D- pull-ups can otherwise disturb internal logic. Add a 3.3 V LDO such as MCP1700 or MCP1640 between VDD and VUSB when operating from a single Li-ion cell. Decouple VDD with 100 nF and 10 uF ceramic placed within 5 mm of the pin; the 28-SOIC layout in datasheet DS30010030 Section 2.4 specifies exact capacitor placement for USB-IF compliance.
Follow Microchip's 28-SOIC USB reference layout for D+/D- trace routing: 90-ohm differential impedance, no stubs, and a continuous ground plane beneath the traces. D+ and D- traces should be length-matched within 0.5 mm and free of vias. Place the 100 nF VUSB decoupling capacitor within 2 mm of the VUSB pin. Skipping this layout discipline is the most common cause of USB-IF compliance failures and radiated-emission issues.
Do not confuse the 'T' suffix (Tape and Reel) with a temperature grade. The 'I' in 'I/SO' denotes the industrial -40C to +85C operating range, while 'E' denotes extended -40C to +125C. Mixing the two codes in production orders has caused field failures in automotive-adjacent designs. Also, the XLP deep-sleep mode requires re-arming all wake sources on every wake cycle - firmware state machines should be designed around the Sleep/Wake Peripheral Library (PLIB) calls rather than busy-wait loops, or sleep current will not drop to nanoamp range.
Compliance Information
RoHS compliant per Microchip product page. Industrial temp grade only; extended -40C to +125C requires 'E' suffix variant. AEC-Q100 not qualified.
