PIC24FJ64GU202-I/SO - 16-bit USB MCU, 64KB Flash, 28-SOIC
MPN: PIC24FJ64GU202-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.96 | $2.96 |
| 10 | $2.66 | $26.60 |
| 100 | $2.31 | $231.00 |
| 500 | $1.98 | $990.00 |
| 1,000 | $1.76 | $1,760.00 |
PIC24FJ64GU202-I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, peripherals, and I/O on one die. The 16-bit PIC24F class sits between 8-bit PIC MCUs and 32-bit ARM Cortex parts: it offers 16 MIPS throughput at 32 MHz, a modified Harvard architecture, and DSP-friendly instructions for sensor processing. Within the power-management hierarchy, MCU families are grouped as general-purpose (GP), graphics (DA), USB (GU), and low-power (GL), and the GU2 line specifically bundles Full-Speed USB with XLP current budgets below 1 µA in sleep.
Key features include 64 KB (22K x 24) ECC Flash with self-programmability, 8 KB RAM, an integrated USB 2.0 Full-Speed PHY supporting Host/Device/OTG roles, four 16-bit timers, multiple UART/SPI/I2C peripherals, and a 12-bit ADC with 9 channels. The PIC24FJ64GU202-I/SO also exposes Peripheral Pin Select (PPS) for flexible signal routing, a Real-Time Clock Calendar (RTCC) with calendar mode, and Core Independent Peripherals (CIPs) such as CLC and 16-bit PWM that run without CPU intervention.
Typical applications include USB HID peripherals, USB-to-UART bridges, low-power sensor nodes with USB charging, medical data loggers, and industrial human-machine interfaces (HMIs). The USB OTG capability also supports point-of-sale terminals and small appliances that need to act as either host or device.
When designing with this device, allocate a 4 KB Flash block for the USB bootloader to enable field firmware upgrades, and add a 0.1 µF decoupling capacitor close to every VDD pin. Because the part is in a 300-mil 28-SOIC, hand-soldering and rework remain straightforward even at prototype volumes.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not collected on the manufacturer datasheet or single distributor listing.
Drop-in alternatives for PIC24FJ64GU202-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 PIC24FJ64GU202-I/SO (same form factor and footprint) — differing in ADC, Operating Temperature, Package, Timers, Communication Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ64GA202-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ32GU202-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ64GB002-I/SO
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC24FJ64GU202-I/MV
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.21 / Unit
View Datasheet →PIC24FJ64GU202-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F 16-bit modified Harvard |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Program Memory (Flash) | 64 KB (22K x 24) ECC Flash |
| Data RAM | 8 KB |
| USB Interface | USB 2.0 Full-Speed Host/Device/OTG PHY integrated |
| ADC | 12-bit, up to 9 channels |
| Timers | 4 x 16-bit |
| Communication Peripherals | 2x UART, 2x SPI, 2x I2C |
| Operating Voltage | 2.0 V to 3.6 V |
| Low Power Mode Current | Down to a few hundred nA (XLP sleep, per Microchip product page) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-pin SOIC (SO) |
| Pin Count | 28 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC24FJ64GU202-I/SO Pin Configuration
| Pin 1 | RA0 — PORTA bit 0 / analog / PPS |
| Pin 2 | RA1 — PORTA bit 1 / analog / PPS |
| Pin 3 | RB0 — PORTB bit 0 / analog / PPS |
| Pin 4 | RB1 — PORTB bit 1 / analog / PPS |
| Pin 5 | RB2 — PORTB bit 2 / analog / PPS |
| Pin 6 | RB3 — PORTB bit 3 / analog / PPS |
| Pin 7 | VDD — Positive supply (2.0-3.6 V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSCI — Crystal oscillator input |
| Pin 10 | OSCO — Crystal oscillator output |
| Pin 11 | RA2 — PORTA bit 2 / analog / PPS |
| Pin 12 | RA3 — PORTA bit 3 / analog / PPS |
| Pin 13 | RB4 — PORTB bit 4 / analog / PPS |
| Pin 14 | RB5 — PORTB bit 5 / analog / PPS |
| Pin 15 | RB6 — PORTB bit 6 / PPS |
| Pin 16 | RB7 — PORTB bit 7 / PPS |
| Pin 17 | AVDD — Analog positive supply |
| Pin 18 | AVSS — Analog ground |
| Pin 19 | RB8 — PORTB bit 8 / PPS |
| Pin 20 | RB9 — PORTB bit 9 / PPS |
| Pin 21 | RB10 — PORTB bit 10 / PPS |
| Pin 22 | RB11 — PORTB bit 11 / PPS |
| Pin 23 | VCAP — Internal voltage regulator decoupling |
| Pin 24 | RB12 — PORTB bit 12 / PPS |
| Pin 25 | RB13 — PORTB bit 13 / PPS |
| Pin 26 | D+ — USB D+ data line |
| Pin 27 | D- — USB D- data line |
| Pin 28 | VUSB — USB transceiver supply / 3.3 V regulator output |
Typical Applications
PIC24FJ64GU202-I/SO is suitable for 7 applications: USB HID Peripheral, USB-to-UART Bridge, Low-Power Sensor Node with USB Charging, Medical Data Logger, Industrial HMI Controller, Point-of-Sale Terminal, USB Mass Storage Device.
USB HID Peripheral
The PIC24FJ64GU202-I/SO is well suited as a USB HID peripheral controller. Its integrated Full-Speed USB 2.0 PHY eliminates external transceivers, and 16 MIPS at 32 MHz easily handles HID report parsing, debouncing, and descriptor handling without CPU strain. With 64 KB of Flash, full HID class stacks from Microchip's MLA library fit comfortably alongside application code. The 28-SOIC package keeps the BOM small and the footprint hand-solderable for prototyping, while the 2.0-3.6 V supply range lets the part share the USB 3.3 V rail directly.
Recommended
USB-to-UART Bridge
The 2x UART peripherals combined with integrated USB Full-Speed OTG make the PIC24FJ64GU202-I/SO an excellent drop-in for USB-to-UART bridge designs, replacing FTDI-style chips with a programmable MCU. PPS routing lets the designer remap UART lines onto almost any GPIO, simplifying PCB layout. The 12-bit ADC can additionally monitor the UART-side line for voltage-level reporting to the host. XLP sleep keeps idle bridge current below 1 mA, useful for bus-powered accessories that must meet USB suspend current budgets.
Recommended
Low-Power Sensor Node with USB Charging
Battery-powered environmental sensors that occasionally attach to USB for charging and data download benefit from the PIC24FJ64GU202-I/SO's XLP nanoamp sleep, RTCC retention, and on-chip USB OTG. The part can run a sensor sweep every minute on AA cells for years, then wake via USB attach to stream data at Full-Speed. The 12-bit ADC handles temperature, humidity, and analog sensor inputs without an external front end. PPS allows I2C sensors to coexist with SPI flash on the same 28-SOIC pin budget.
Recommended
Medical Data Logger
Medical data loggers that record patient metrics and download via USB to a clinician's PC fit naturally on the PIC24FJ64GU202-I/SO. The 64 KB ECC Flash provides wear-leveled storage for longitudinal measurements, and ECC improves data integrity over the part's lifetime. XLP sleep keeps thermal budget low so the device can be worn, while the integrated USB OTG eliminates external interface ICs that would add cost and FDA documentation overhead. The industrial temperature grade supports a wide range of clinical environments.
Recommended
Industrial HMI Controller
Small industrial HMIs that expose a USB port for configuration or diagnostics benefit from the PIC24FJ64GU202-I/SO's combination of 4 x 16-bit timers, multiple UARTs, and USB Host capability. The Core Independent Peripherals (CIPs) such as CLC and 16-bit PWM can drive keypads, LEDs, and relay logic without CPU overhead, leaving the 16 MIPS core free for protocol parsing. The 28-SOIC package survives hand-soldered rework on long-life industrial boards, and PPS keeps board layout simple when pin functions change late in the design.
Recommended
Point-of-Sale Terminal
Compact point-of-sale (POS) terminals that need USB OTG for connecting printers, keyboards, or card readers pair well with the PIC24FJ64GU202-I/SO. USB Host mode enables peripherals; USB Device mode enables PC-side configuration. The 12-bit ADC and 8 KB RAM handle keypad scanning and short transaction buffers, while the 64 KB Flash stores the application and a USB bootloader for field updates. ECC Flash is valuable for audit-log integrity in financial transactions where bit errors are unacceptable.
Recommended
USB Mass Storage Device
The PIC24FJ64GU202-I/SO's Full-Speed USB Device capability and 64 KB Flash are enough to implement a small USB Mass Storage Class device using the on-chip Flash as the backing store, optionally supplemented by external SPI flash. PPS keeps SPI flash pins off the dedicated USB D+/D- lines. With XLP, the device can enter low-power states between host commands, useful for portable backup gadgets. The 28-SOIC package suits compact dongle-style enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ64GU202-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ64GA202-I/SO | PIC24FJ32GU202-I/SO | PIC24FJ64GB002-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC | 28-SOIC | 28-SOIC |
| Program Memory (Flash) | 64 KB | 64 KB | 32 KB (-50%) | 64 KB |
| Data RAM | 8 KB | 8 KB | 4 KB (-50%) | 8 KB |
| USB Interface | USB 2.0 Full-Speed Host/Device/OTG | No USB | USB 2.0 Full-Speed Host/Device/OTG | USB 2.0 Full-Speed Host/Device/OTG |
| Crypto Engine | No | Yes (AES, RNG, key storage) | No | No |
| XLP Sleep Current | Hundreds of nA | Hundreds of nA | Hundreds of nA | ~1 µA (older generation) |
| 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 |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated Full-Speed USB OTG with XLP nanoamp sleep (vs PIC24FJ64GA202-I/SO)
- Same package footprint for cost/size optimization (vs PIC24FJ32GU202-I/SO)
- Newer CIP-rich core independent peripherals (vs PIC24FJ64GB002-I/SO)
Design Notes
Add a 0.1 µF decoupling capacitor as close as possible to every VDD/AVDD pin, plus a 4.7-10 µF bulk capacitor on the main 3.3 V rail. The PIC24FJ64GU202-I/SO requires a 10 µF low-ESR cap on VCAP (pin 23) to stabilize the internal 1.8 V core regulator. Without proper VCAP decoupling the part can exhibit brown-out resets under USB burst load. Estimate: VCAP ripple should stay below 50 mV pp; ceramic X5R/X7R 10 µF 6.3 V is sufficient at room temperature.
USB signal integrity is critical on the 28-SOIC footprint - keep the D+ and D- traces (pins 26 and 27) matched in length and impedance (90 ohm differential) and as short as practical. Place the VUSB 3.3 V regulator output bypass (pin 28) close to the connector side. Series ferrite beads on VBUS help isolate USB bus noise from the rest of the board. Skip bulk capacitance directly on D+/D- lines to avoid violating USB signal quality specs.
Reserve a 4 KB Flash block (the top page of program memory on PIC24F) for a USB bootloader to enable field firmware upgrades. When laying out the 28-SOIC, place the 32 kHz crystal on OSCI/OSCO (pins 9/10) with short traces and a guard ring to minimize stray capacitance. PPS pin assignments must be committed in firmware before any peripheral that depends on them (UART, SPI, PWM) is initialized - forgetting this is the most common new-user gotcha.
Compliance Information
RoHS and lead-free status per Microchip product page and DigiKey/Mouser listings. Halogen-free status not explicitly listed in the provided data; AEC-Q100 not applicable for general-purpose MCU.
