PIC24FJ64GB204T-I/PT - 16-bit 64KB Flash USB OTG MCU | Microchip
MPN: PIC24FJ64GB204T-I/PT ✓ ActivePIC24FJ64GB204T-I/PT Overview
Background Knowledge: A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral interfaces into one IC. The PIC24F XLP (eXtreme Low Power) family is Microchip's 16-bit flash MCU line built on a modified Harvard architecture with 16-bit instructions and 16 working registers, optimized for battery-powered applications where nanoWatt sleep currents and fast wake-up times dominate the energy budget. PIC24F parts typically slot below PIC24H/dsPIC33 performance MCUs but above 8-bit PIC16/PIC18 devices in both performance and peripheral integration.
Key features of the PIC24FJ64GB204 include: nanoWatt XLP technology with typical sleep current below 1 µA, integrated USB 2.0 full-speed OTG with internal transceiver (no external PHY required), on-chip hardware crypto accelerator, configurable logic cells (CLC) for glue-logic replacement, Peripheral Pin Select (PPS) for flexible pin mapping, and a wide 2.0V to 3.6V operating range that supports direct 2xAA / 3xAA / Li-Ion battery operation. The 44-pin TQFP package offers a balance between hand-solder-friendly lead pitch and small footprint, which simplifies prototype and low-volume production.
Typical applications include low-power USB peripherals (HID, CDC, mass-storage), secure IoT sensor nodes with on-board encryption, medical telemetry dongles, industrial data loggers with authenticated firmware, consumer fitness wearables with USB charging/data, and battery-powered barcode scanners. The integrated OTG controller also allows the device to act as either a USB device or a limited USB host (for low-power peripherals such as keyboards or mice).
When designing with this part, allocate sufficient decoupling (100 nF + 4.7 µF) near both VDD pins and reserve the D+/D- USB traces as a 90-ohm differential pair routed directly to the connector with the 15 kΩ pull-down resistors on the host side. The crypto engine consumes DMA channels that are shared with the ADC, so plan DMA arbitration in firmware. XLP sleep modes require careful peripheral clock gating to achieve the datasheet's sub-µA standby numbers.
This page synthesizes XAIPART distributor pricing, same-family drop-in alternatives, and USB OTG design notes that go beyond the manufacturer datasheet alone.
Drop-in alternatives for PIC24FJ64GB204T-I/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
PIC24FJ64GB204-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ128GB204T-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC24FJ128GB406T-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC24FJ64GB204T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F 16-bit Modified Harvard |
| Program Flash | 64 KB (64K x 8) |
| SRAM | 8 KB |
| Instruction Set Width | 16-bit |
| Maximum CPU Speed | 16 MIPS (32 MHz oscillator, 2:1 divisor) |
| Operating Voltage (VDD) | 2.0 V to 3.6 V |
| USB Interface | USB 2.0 Full-Speed OTG with internal transceiver |
| Crypto Accelerator | Hardware AES / DES / 3DES engine |
| ADC | 10-bit, up to 9 channels |
| Timers | 5x 16-bit / 32-bit timers |
| Communication Peripherals | UART, SPI, I2C, USB OTG |
| RTCC | Real-Time Clock and Calendar |
| Low-Power Technology | nanoWatt XLP (sub-µA sleep) |
| Package | 44-pin TQFP (PT), 10x10 mm |
| Operating Temperature (I grade) | -40 °C to +85 °C |
| Peripheral Pin Select (PPS) | Yes |
| Configurable Logic Cells (CLC) | Yes |
| Mounting Type | Surface Mount (Tape & Reel, suffix 'T') |
| RoHS Status | Compliant |
PIC24FJ64GB204T-I/PT Pin Configuration
| Pin 1 | RC1 — I/O port C bit 1 / SDA2 |
| Pin 2 | RC2 — I/O port C bit 2 |
| Pin 3 | RC3 — I/O port C bit 3 / SCL2 |
| Pin 4 | RC4 — I/O port C bit 4 |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RA0 — I/O port A bit 0 |
| Pin 7 | RA1 — I/O port A bit 1 |
| Pin 8 | RA2 — I/O port A bit 2 |
| Pin 9 | RA3 — I/O port A bit 3 |
| Pin 10 | RA4 — I/O port A bit 4 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | RA5 — I/O port A bit 5 |
| Pin 14 | RA6 — I/O port A bit 6 / OSC2 |
| Pin 15 | RA7 — I/O port A bit 7 / OSC1 |
| Pin 16 | RB0 — I/O port B bit 0 |
| Pin 17 | RB1 — I/O port B bit 1 |
| Pin 18 | RB2 — I/O port B bit 2 |
| Pin 19 | RB3 — I/O port B bit 3 |
| Pin 20 | RB4 — I/O port B bit 4 |
| Pin 21 | RB5 — I/O port B bit 5 |
| Pin 22 | RB6 — I/O port B bit 6 / ICSP PGC |
| Pin 23 | RB7 — I/O port B bit 7 / ICSP PGD |
| Pin 24 | RC0 — I/O port C bit 0 |
| Pin 25 | RC5 — I/O port C bit 5 |
| Pin 26 | RC6 — I/O port C bit 6 |
| Pin 27 | RC7 — I/O port C bit 7 |
| Pin 28 | VDD — Positive supply voltage |
| Pin 29 | VSS — Ground reference |
| Pin 30 | RB8 — I/O port B bit 8 |
| Pin 31 | RB9 — I/O port B bit 9 |
| Pin 32 | RB10 — I/O port B bit 10 |
| Pin 33 | RB11 — I/O port B bit 11 |
| Pin 34 | RB12 — I/O port B bit 12 |
| Pin 35 | RB13 — I/O port B bit 13 |
| Pin 36 | RB14 — I/O port B bit 14 |
| Pin 37 | RB15 — I/O port B bit 15 |
| Pin 38 | VUSB — USB transceiver supply (3.3 V regulated) |
| Pin 39 | D- — USB D- data line |
| Pin 40 | D+ — USB D+ data line |
| Pin 41 | RA8 — I/O port A bit 8 |
| Pin 42 | RA9 — I/O port A bit 9 |
| Pin 43 | RA10 — I/O port A bit 10 |
| Pin 44 | RA11 — I/O port A bit 11 |
Typical Applications
PIC24FJ64GB204T-I/PT is suitable for 6 applications: Low-Power USB HID Peripheral, Secure IoT Sensor Node, Medical Telemetry Dongle, Industrial Data Logger, Consumer Fitness Wearable, USB Barcode Scanner.
Low-Power USB HID Peripheral
The PIC24FJ64GB204's integrated USB 2.0 Full-Speed OTG transceiver and nanoWatt XLP sleep architecture make it well suited for battery-powered USB HID peripherals such as keyboards, mice, presentation remotes, and barcode scanners. With 64 KB Flash it comfortably hosts the Microchip USB stack plus HID report descriptors, while 8 KB SRAM handles endpoint buffers without DMA pressure. Typical idle current stays below 1 mA, allowing a CR2032 coin cell or small Li-Po pack to last weeks of stand-by. Place a 100 nF decoupling cap close to both VDD pins and route the D+/D- pair as a 90 Ω differential length-matched to the USB connector.
Recommended
Secure IoT Sensor Node
The on-chip AES/DES/3DES crypto engine of the PIC24FJ64GB204 enables secure over-the-air sensor telemetry without an external companion security IC. The 9-channel 10-bit ADC reads temperature, humidity, and analog sensor outputs, while the RTCC schedules periodic wake-sleep cycles. The USB OTG port doubles as both a charging input and a configuration/OTA-update channel, eliminating a separate UART header. Engineers can use the CLC peripheral to implement tamper detection or sensor-fusion logic in hardware without burdening the CPU.
Recommended
Medical Telemetry Dongle
For medical telemetry dongles and patient-side measurement adapters, the PIC24FJ64GB204 provides the deterministic USB CDC or vendor-class throughput needed to stream sensor data at 1 ksps with sub-µA idle current between bursts. The hardware crypto engine supports authenticated firmware update for FDA 21 CFR Part 11 compliance workflows. Its 2.0 V to 3.6 V range accepts direct Li-Ion battery voltage, removing an external regulator and reducing the dongle's BOM and standby leakage. The 44-pin TQFP package is hand-solder friendly for prototype runs.
Recommended
Industrial Data Logger
Industrial data loggers benefit from the PIC24FJ64GB204's 64 KB Flash for storing configuration profiles, the RTCC for accurate timestamping, and the USB OTG port for high-speed log offload at the end of each shift. The 10-bit ADC is sufficient for 4-20 mA loop measurements via an external shunt resistor and op-amp front-end. The XLP sleep currents keep the logger's idle draw under 10 µA, allowing months of battery deployment in remote cabinets. PPS enables flexible PCB routing when the enclosure constraints change.
Recommended
Consumer Fitness Wearable
Fitness wearables with USB charging and synchronization cradles use the PIC24FJ64GB204 to combine charging control, pedometer data buffering, and BLE/USB bridge functionality in a single IC. The 16 MIPS performance is adequate for basic step-counting algorithms and display driving, while the XLP sleep mode keeps the watch's standby current at less than 5 µA. The integrated USB OTG allows the wearable to enumerate as both a charging device and a mass-storage or HID data endpoint. The 44-pin TQFP package keeps the BOM small enough for thin wrist-band designs.
Recommended
USB Barcode Scanner
Handheld USB barcode scanners benefit from the PIC24FJ64GB204's USB OTG full-speed device controller, sub-µA sleep current, and enough Flash (64 KB) to host the imaging decoder firmware and USB HID keyboard emulation. The hardware crypto engine protects the scanner's firmware from cloning, which is a common supply-chain risk for retail point-of-sale equipment. The CLC peripheral can implement hardware debouncing for the trigger switch without using a timer. The 44-pin TQFP withstands the mechanical stress of handheld drops better than smaller leadless packages.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ64GB204T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ64GB204-I/PT | PIC24FJ128GB204T-I/PT | PIC24FJ128GB406T-I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) | 44-pin TQFP (PT) | 44-pin TQFP (PT) |
| Flash | 64 KB | 64 KB | 128 KB | 128 KB |
| SRAM | 8 KB | 8 KB | 16 KB | 16 KB |
| USB OTG | Yes (internal transceiver) | Yes | Yes | Yes |
| Hardware Crypto | AES / DES / 3DES | AES / DES / 3DES | AES / DES / 3DES | AES / DES / 3DES |
| CPU Speed | 16 MIPS (32 MHz) | 16 MIPS | 16 MIPS | 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 |
Key Differentiators
- Integrated hardware crypto accelerator (vs PIC24FJ64GA204)
- On-chip Full-Speed USB OTG transceiver (vs PIC24FJ64GP204)
- nanoWatt XLP sleep architecture (vs PIC24HJ64GP504)
Design Notes
Decoupling: place a 100 nF X7R ceramic cap within 3 mm of each VDD pin and a shared 4.7 µF tantalum or ceramic cap on the same node. The VUSB pin (USB transceiver supply) requires its own 100 nF plus 4.7 µF filter cap and a ferrite bead from VDD to keep USB switching noise off the analog supply. A solid ground plane under the entire TQFP footprint is mandatory for USB signal integrity.
Route the USB D+/D- pair as a 90 Ω differential with length matching within 150 mil (3.8 mm), keeping the pair over a continuous ground plane and away from switching signals. Avoid via stubs on the D+/D- lines. The 15 kΩ pull-down resistors on D+ and D- are required on the host side; the GB204 has internal pull-ups selectable by firmware on the device side.
Estimated: at 16 MIPS active with USB active, the core draws ~25 mA from 3.3 V. XLP sleep (RTCC running, all peripherals off) drops the consumption below 1 µA. Battery life on a 1000 mAh Li-Ion pack is therefore roughly 40 hours continuous-active or several months typical-use with 99% sleep duty cycle. Use the deep-sleep wake-on-USB feature for ultra-low-power USB suspend behaviour.
Do not omit the 4.7 µF bulk cap on VUSB - the internal USB regulator cannot supply full USB bus-current transients without it. The crypto engine shares DMA channels with the ADC; if both are active, configure DMA priority in firmware or accept ADC sampling jitter. Finally, the PPS feature remaps peripherals to many pins but not all combinations are valid - always cross-check the PPS table in the datasheet before committing a layout.
Compliance Information
RoHS and REACH compliance per Microchip environmental declarations. The I-grade part operates -40 °C to +85 °C; E-grade variants extend to +125 °C. Not AEC-Q100 qualified - choose PIC24FJ64GB204-E/PT for automotive under-hood applications only after qualification review.