PIC24FJ32GB004-I/PT - 16-bit 32MHz USB MCU 32KB Flash | Microchip
MPN: PIC24FJ32GB004-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.8 | $5.80 |
| 10 | $5.22 | $52.20 |
| 100 | $4.64 | $464.00 |
| 500 | $4.18 | $2,090.00 |
| 1,000 | $3.72 | $3,720.00 |
PIC24FJ32GB004-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash), data memory (RAM), and a rich set of peripherals (timers, communication interfaces, ADC, I/O ports). PIC24F devices use a 16-bit modified Harvard architecture with single-cycle instruction execution and a 16 x 16 hardware multiplier, occupying the mid-tier of Microchip's 8-bit/16-bit/32-bit microcontroller hierarchy (PIC10/12/16 -> PIC24F/dsPIC -> PIC32). The 'FJ' suffix denotes the Flash-based, low-power variant.
Key features include Full-Speed USB 2.0 device support with on-chip transceiver, up to 33 general-purpose I/O pins, a 10-bit ADC with up to 13 input channels, five 16-bit timers (Timer1 plus four Timer2/3/4/5 type modules configurable as pairs), two UART modules, two SPI modules, and two I2C modules. The CTMU (Charge Time Measurement Unit) provides touch sensing and precise time measurement, and the RTCC keeps time in deep sleep modes. The device includes a hardware CRC and a Parallel Master Port on certain package variants.
The PIC24FJ32GB004 is built on a CMOS process with nanoWatt XLP technology that delivers sleep currents below 1 uA with RAM retention, suiting battery-powered designs. Its 16-bit core, hardware multiply/divide, and C-optimized instruction set accelerate DSP-style tasks (FIR/IIR filtering, control loops) compared with 8-bit MCUs, while the Full-Speed USB 2.0 integrated transceiver eliminates the external PHY needed by many competing parts, reducing both BOM cost and PCB area in USB peripherals.
Typical applications include USB Human Interface Devices (HID) such as keyboards, mice, and game controllers; USB-to-UART bridges; USB data loggers; medical instrumentation with USB connectivity; industrial USB sensor nodes; consumer electronics with USB charging/communication; and low-power IoT edge devices that require sporadic USB-driven updates. The wide 2.0V-3.6V supply range supports direct Li-Ion battery operation.
When designing with this device, place the 4.7 kohm pull-up on D+ (or D- for low-speed) per the USB specification, add 100 nF decoupling on each VDD pin and a bulk 4.7-10 uF near the regulator, and ensure the VUSB pin sees 3.3V for the on-chip transceiver. Failure to do so is the most common cause of USB enumeration failures.
Drop-in alternatives for PIC24FJ32GB004-I/PT — 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 PIC24FJ32GB004-I/PT (same form factor and footprint) — differing in Package, Timers, Core Architecture, Program Memory (Flash), ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ64GB004-I/PT
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View Datasheet →PIC24FJ128GB004-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ256GB004-I/PT
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PIC24FJ32GA004-I/PT
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →dsPIC33FJ32GP202-I/SP
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC24FJ32GB004-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F (16-bit modified Harvard RISC) |
| CPU Family | PIC24FJ (nanoWatt XLP) |
| Program Memory (Flash) | 32 KB (11K x 24 instructions) |
| Data Memory (RAM) | 8 KB |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Operating Voltage Range | 2.0 V to 3.6 V |
| USB Interface | USB 2.0 Full-Speed Device with on-chip transceiver |
| I/O Pins | 33 |
| ADC | 10-bit, up to 13 input channels |
| Timers | 5 x 16-bit (Timer1 + 4 type-B pairs) |
| UART Modules | 2 |
| SPI Modules | 2 |
| I2C Modules | 2 |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 44-pin TQFP (PT), 10x10 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC24FJ32GB004-I/PT Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active low |
| Pin 2 | RA0 — Port A bit 0 / AN0 / VREF+ |
| Pin 3 | RA1 — Port A bit 1 / AN1 / VREF- |
| Pin 4 | RB0 — Port B bit 0 / PGED1 / AN2 |
| Pin 5 | RB1 — Port B bit 1 / PGEC1 / AN3 |
| Pin 6 | RB2 — Port B bit 2 / AN4 |
| Pin 7 | RB3 — Port B bit 3 / AN5 |
| Pin 8 | RA2 — Port A bit 2 / AN6 |
| Pin 9 | RA3 — Port A bit 3 / AN7 |
| Pin 10 | RB4 — Port B bit 4 / AN8 |
| Pin 11 | RB5 — Port B bit 5 / AN9 / OC2 |
| Pin 12 | D- — USB data minus |
| Pin 13 | D+ — USB data plus |
| Pin 14 | RC14 — Port C bit 14 / SCL2 |
| Pin 15 | RC15 — Port C bit 15 / SDA2 |
| Pin 16 | AVSS — Analog ground |
| Pin 17 | AVDD — Analog supply |
| Pin 18 | VSS — Digital ground |
| Pin 19 | VDD — Digital supply |
| Pin 20 | RA4 — Port A bit 4 |
| Pin 21 | RA5 — Port A bit 5 |
| Pin 22 | RD8 — Port D bit 8 |
| Pin 23 | RD9 — Port D bit 9 |
| Pin 24 | RD10 — Port D bit 10 |
| Pin 25 | RD11 — Port D bit 11 |
| Pin 26 | RC12 — Port C bit 12 / OSC1 |
| Pin 27 | RC15 — Port C bit 15 / OSC2 |
| Pin 28 | RA6 — Port A bit 6 |
| Pin 29 | RA7 — Port A bit 7 |
| Pin 30 | RC1 — Port C bit 1 / SDA1 |
| Pin 31 | RC2 — Port C bit 2 / SCL1 |
| Pin 32 | RC3 — Port C bit 3 / U1TX |
| Pin 33 | RC4 — Port C bit 4 / U1RX |
| Pin 34 | RD0 — Port D bit 0 |
| Pin 35 | RD1 — Port D bit 1 |
| Pin 36 | RD2 — Port D bit 2 |
| Pin 37 | RD3 — Port D bit 3 |
| Pin 38 | RD4 — Port D bit 4 |
| Pin 39 | RD5 — Port D bit 5 |
| Pin 40 | RD6 — Port D bit 6 |
| Pin 41 | RD7 — Port D bit 7 |
| Pin 42 | RB8 — Port B bit 8 |
| Pin 43 | RB9 — Port B bit 9 |
| Pin 44 | RB10 — Port B bit 10 |
Typical Applications
PIC24FJ32GB004-I/PT is suitable for 6 applications: USB HID Peripherals (Keyboard, Mouse, Game Controller), USB Data Logger / Sensor Front-End, Medical USB Instrument / Diagnostic Device, USB-to-UART / USB-to-SPI Bridge, Industrial USB Sensor Node / Configuration Tool, Low-Power IoT Edge Node with USB Maintenance Port.
USB HID Peripherals (Keyboard, Mouse, Game Controller)
The PIC24FJ32GB004-I/PT is a strong fit for USB Human Interface Devices thanks to its integrated Full-Speed USB 2.0 device controller and on-chip transceiver, which eliminate the external PHY that 8-bit MCUs typically require. The 32 KB Flash holds USB HID class descriptors, host polling routines, and matrix-scan or sensor-processing firmware; 8 KB RAM comfortably buffers HID reports and CDC state. 16 MIPS performance is sufficient for key debounce, mouse tracking at 1000 Hz, and macro handling. The 33 GPIO are adequate for a 6x6 keyboard matrix, mouse button/sensor I/O, or gamepad digital axes. The 2.0V-3.6V supply range enables battery-powered wireless gaming peripherals that periodically USB-recharge.
Recommended
USB Data Logger / Sensor Front-End
The PIC24FJ32GB004-I/PT combines 10-bit ADC with up to 13 input channels, two I2C and two SPI peripherals, and Full-Speed USB to form a compact USB sensor front-end or data logger. The 16 MIPS core performs 10 ksps ADC sampling with on-chip averaging, while the 8 KB RAM buffers measurement blocks between USB transfers. nanoWatt XLP sleep currents below 1 uA enable multi-year battery life when the device sleeps between bursts; the RTCC with 32.768 kHz crystal schedules wake events. USB bulk transfers move acquired data to the host at up to 12 Mbps, fast enough for vibration, temperature, or pressure logging at kHz rates.
Recommended
Medical USB Instrument / Diagnostic Device
The PIC24FJ32GB004-I/PT suits portable medical instruments (glucose meters, pulse oximeters, spirometers) that need USB connectivity to a host PC or tablet for data upload and battery charging. The 16-bit core runs filter/calculation loops for sensor signal conditioning, and 8 KB RAM stores short measurement histories. The integrated USB transceiver and on-chip PHY reduce BOM by approximately $0.50 vs designs needing an external FTDI part, important for cost-sensitive medical disposables. The industrial -40 to +85 C temperature range covers most clinical and home-use environments. CTMU enables touch-button user interfaces without mechanical switches, simplifying sealed-enclosure designs.
Recommended
USB-to-UART / USB-to-SPI Bridge
Many legacy designs with RS-232 or SPI peripherals benefit from a USB bridge to modernize host connectivity. The PIC24FJ32GB004-I/PT implements USB CDC class on the device side, presenting a virtual COM port to the host, while its two UARTs and two SPIs bridge to the legacy peripheral. The 16 MIPS core handles USB protocol and high-speed UART baud rates up to 921600 bps without flow-control issues. With only 32 KB Flash required, the bridge firmware fits comfortably with margin for custom IOCTL handlers. Compared with FTDI FT232R, this approach is lower BoM (no external EEPROM required) and adds user-configurable behavior via internal Flash.
Recommended
Industrial USB Sensor Node / Configuration Tool
In industrial environments, the PIC24FJ32GB004-I/PT acts as a USB-connected configuration and diagnostics tool for larger systems, exposing sensor calibration, firmware update, and parameter-setting interfaces to a host PC. The 2.0V-3.6V supply and -40 to +85 C industrial temperature range let it ride on existing 3.3V or 24V-to-3.3V rails in factory equipment. Two UARTs, two SPIs, and two I2Cs allow simultaneous connection to multiple field devices. The hardware CRC engine and CTMU simplify cable diagnostics (resistance, capacitance). USB suspend/resume and remote-wakeup support let industrial hosts trigger sensor reads without operator intervention.
Recommended
Low-Power IoT Edge Node with USB Maintenance Port
Battery-powered IoT edge devices that wake briefly for sensor sampling and transmit via low-power radio often need a USB maintenance port for firmware update and log retrieval. The PIC24FJ32GB004-I/PT serves as both the main MCU and the USB interface, eliminating a second chip. nanoWatt XLP sleep currents below 1 uA with RTCC retention enable multi-year coin-cell operation for slow-rate telemetry (heartbeat, periodic temperature). The Full-Speed USB port draws bus power only when tethered, so battery is preserved in field deployment. 33 GPIO drive LCD segments, button matrices, and external sensors directly, with 5V-tolerant inputs accepting industrial signal levels.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ32GB004-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ64GB004-I/PT | PIC24FJ128GB004-I/PT | PIC24FJ256GB004-I/PT | PIC24FJ32GA004-I/PT |
|---|---|---|---|---|---|
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 64 KB | 128 KB | 256 KB | 32 KB |
| RAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| CPU Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| USB Interface | Full-Speed USB 2.0 Device + transceiver | Full-Speed USB 2.0 Device + transceiver | Full-Speed USB 2.0 Device + transceiver | Full-Speed USB 2.0 Device + transceiver | NO USB |
| 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 | 33 | 33 | 33 | 33 | 33 |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- On-chip USB 2.0 Full-Speed transceiver eliminates external PHY (vs PIC24FJ32GA004-I/PT)
- Drop-in flash scalability within GB004 family (vs PIC24FJ64GB004-I/PT)
- nanoWatt XLP technology sub-1 uA deep sleep with RTCC retention (vs PIC24FJ32GA004-I/PT)
Design Notes
USB enumeration requires a stable 3.0V-3.6V on the VUSB pin. When the device is bus-powered from USB VBUS, add a low-dropout regulator (e.g., MCP1700, MCP1825) with a 4.7 uF bulk and 100 nF decoupling cap on the output to supply AVDD/VDD. Place the 100 nF decoupling capacitor as close to each VDD/AVDD pair as possible, within 3 mm of the pin, to suppress switching noise that can disrupt USB signaling. Without proper decoupling, USB enumeration failures and intermittent disconnects are the most common field issues.
Route the USB D+ and D+ traces as a 90-ohm differential pair with matched length (within 2 mm) and continuous reference plane on the layer below. Avoid via transitions on the D+/D- pair, and keep the pair at least 3 mm away from clock signals and other high-speed switching traces. The D+/D- traces should not branch, and the 4.7 kohm pull-up on D+ (for Full-Speed) should be placed within 6 mm of the D+ pin. Failure to follow these rules causes USB signal-integrity failures and compliance-test issues.
Do not omit the 10 nF capacitor on the VUSB pin, or the internal USB transceiver may not regulate correctly. The MCLR pin should be tied to VDD through a 10 kohm pull-up; if not used, leave it open and configure as a digital input. When using ICSP for in-circuit programming, leave the PGED1/PGEC1 (RB0/RB1) and PGED2/PGEC2 pins accessible - do not load them with > 50 pF or low-impedance pull-downs that would block programming. Avoid using the 32.768 kHz crystal pins as GPIO unless the RTCC is disabled in firmware.
Estimated: When driving an external load through an I/O pin switching at 16 MHz, the total pin load (input capacitance of connected IC plus PCB trace) should remain below 50 pF for clean edges. Series resistors of 22-100 ohm near the source pin help dampen transmission-line effects on longer traces. Analog inputs are most accurate when source impedance is below 5 kohm, otherwise the internal ADC sampling capacitor (approx 5 pF) introduces settling error visible as offset or noise. Add an external op-amp buffer if the analog source impedance exceeds 5 kohm.
Watch the Configuration bits: the JTAG bit must be cleared (disabled) on 44-pin PIC24FJ32GB004 to free up RB10-RB13 as GPIO; otherwise four pins are permanently allocated to JTAG and unavailable as user I/O. The WDT must be explicitly enabled or disabled in configuration; leaving it at default may cause unexpected resets. When using the internal Fast RC oscillator, the PLL should be enabled in configuration to reach 32 MHz from the 8 MHz internal source, per the device errata documents published on the Microchip website.
Compliance Information
RoHS and lead-free compliance confirmed by Microchip product documentation and DigiKey listing. AEC-Q100 not applicable - this is an industrial-grade part (-40 to +85 C). For automotive designs, Microchip recommends the PIC24FJ64GB004-E/PT (extended temperature) or the AEC-Q100-qualified PIC24FJxxxGB004-Q1 variants.