PIC24FJ256GA108T-I/PT - 32MHz 256KB Flash 16-bit MCU TQFP-80 | Microchip
MPN: PIC24FJ256GA108T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.7467 | $7.75 |
| 10 | $6.97 | $69.70 |
| 100 | $6.2 | $620.00 |
| 500 | $5.42 | $2,710.00 |
| 1,000 | $4.65 | $4,650.00 |
PIC24FJ256GA108T-I/PT Overview
A 16-bit microcontroller (MCU) is a programmable processor core with a 16-bit data path, internal Flash program memory, RAM, and integrated peripherals. The PIC24F family uses a Modified Harvard RISC architecture with 24-bit instruction words optimized for C code density and deterministic interrupt response. It sits within the broader taxonomy: PIC24F -> PIC24 family -> PIC microcontroller -> 16-bit MCU -> microcontroller -> embedded processor. The PIC24FJ256GA108 specifically targets general-purpose applications requiring large memory, multiple communication ports, and low standby power.
Key differentiating specifications include 256KB self-programmable Flash with ICSP/In-Circuit Serial Programming support, 16KB SRAM with DMA-capable bus architecture, hardware Real-Time Clock and Calendar (RTCC) with timestamped deep-sleep wake, 12-bit ADC with up to 16 channels, 5x 16-bit timers, and 23 independent time bases. The PPS remap engine allows most digital peripherals to be assigned to multiple physical pins, simplifying PCB layout and reducing signal congestion.
Typical application domains include industrial control panels, low-power IoT sensor nodes with multi-bus connectivity, USB device and human-interface peripherals, medical data loggers, and graphics user interface controllers driving segmented LCDs or TFT panels via external controllers. The 16 MIPS performance and 256KB Flash make the device well-suited for protocol stacks such as Modbus, BACnet, or proprietary wireless command processors.
When designing with the PIC24FJ256GA108T-I/PT, ensure the configuration bits (Fuses) are set correctly for the target oscillator mode and watchdog operation. Decouple each VDD/AVDD pair with 100nF ceramic capacitors placed within 3mm of the pin, and route analog AVSS separately from digital VSS to minimize ADC noise coupling.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not aggregated on the manufacturer product page or individual distributor listings.
Drop-in alternatives for PIC24FJ256GA108T-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 PIC24FJ256GA108T-I/PT (same form factor and footprint) — differing in Core Architecture, Package, Timers, I/O Pins, Standby Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ256GA108-I/PT
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC24FJ128GA108-I/PT
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →PIC24FJ128GA110-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.1 / Unit
View Datasheet →PIC24FJ192GA108T-I/PT
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →PIC24FJ256DA206-I/PT
✅ Drop-In✓ In Stock
$5.39 / Unit
View Datasheet →PIC24FJ192GB108-I/PT
✅ Drop-In✓ In Stock
$4.88 / Unit
View Datasheet →PIC24FJ256GA108T-I/PT Maximum Ratings & Electrical Characteristics
| Product Type | 16-bit Microcontroller (MCU) |
| Family | PIC24FJ256GA110 (eXtreme Low Power) |
| Core Architecture | PIC 16-bit Modified Harvard RISC |
| Program Memory (Flash) | 256 KB (85.5K x 24 instruction words) |
| Data SRAM | 16 KB |
| CPU Speed | 32 MHz max (16 MIPS at 3.3V) |
| Operating Voltage (VDD) | 2.0 V to 3.6 V |
| I/O Pins | 69 (with Peripheral Pin Select) |
| Package | 80-pin TQFP (PT), 12x12 mm body |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (industrial grade) |
| Communication Interfaces | 3x I2C, 3x SPI, 4x UART |
| ADC | 10/12-bit, up to 16 channels |
| Timers | 5x 16-bit + 23 independent time bases |
| Standby Current | <100 nA (typical, RTCC mode) |
| Programming | ICSP (In-Circuit Serial Programming) |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
PIC24FJ256GA108T-I/PT Pin Configuration
| Pin 1 | OSC1/RA0 — Oscillator crystal input / PORTA bit 0 |
| Pin 2 | OSC2/RA1 — Oscillator crystal output / PORTA bit 1 |
| Pin 3 | RA2 — PORTA bit 2 |
| Pin 4 | RA3 — PORTA bit 3 |
| Pin 5 | RA4 — PORTA bit 4 |
| Pin 6 | RA5 — PORTA bit 5 |
| Pin 7 | RA6 — PORTA bit 6 |
| Pin 8 | RA7 — PORTA bit 7 |
| Pin 9 | RB0 — PORTB bit 0 |
| Pin 10 | RB1 — PORTB bit 1 |
| Pin 11 | RB2 — PORTB bit 2 |
| Pin 12 | RB3 — PORTB bit 3 |
| Pin 13 | RB4 — PORTB bit 4 |
| Pin 14 | RB5 — PORTB bit 5 / Programming PGEC1 |
| Pin 15 | RB6 — PORTB bit 6 / Programming PGED1 |
| Pin 16 | RB7 — PORTB bit 7 |
| Pin 17 | RB8 — PORTB bit 8 |
| Pin 18 | RB9 — PORTB bit 9 |
| Pin 19 | RB10 — PORTB bit 10 |
| Pin 20 | RB11 — PORTB bit 11 |
| Pin 21 | RB12 — PORTB bit 12 |
| Pin 22 | RB13 — PORTB bit 13 |
| Pin 23 | RB14 — PORTB bit 14 |
| Pin 24 | RB15 — PORTB bit 15 |
| Pin 25 | RC0 — PORTC bit 0 |
| Pin 26 | RC1 — PORTC bit 1 |
| Pin 27 | RC2 — PORTC bit 2 |
| Pin 28 | RC3 — PORTC bit 3 |
| Pin 29 | RC4 — PORTC bit 4 |
| Pin 30 | RC5 — PORTC bit 5 |
| Pin 31 | RC6 — PORTC bit 6 |
| Pin 32 | RC7 — PORTC bit 7 |
| Pin 33 | RC8 — PORTC bit 8 |
| Pin 34 | RC9 — PORTC bit 9 |
| Pin 35 | RD0 — PORTD bit 0 |
| Pin 36 | RD1 — PORTD bit 1 |
| Pin 37 | RD2 — PORTD bit 2 |
| Pin 38 | RD3 — PORTD bit 3 |
| Pin 39 | RD4 — PORTD bit 4 |
| Pin 40 | RD5 — PORTD bit 5 |
| Pin 41 | RD6 — PORTD bit 6 |
| Pin 42 | RD7 — PORTD bit 7 |
| Pin 43 | RD8 — PORTD bit 8 |
| Pin 44 | RD9 — PORTD bit 9 |
| Pin 45 | RD10 — PORTD bit 10 |
| Pin 46 | RD11 — PORTD bit 11 |
| Pin 47 | RD12 — PORTD bit 12 |
| Pin 48 | RD13 — PORTD bit 13 |
| Pin 49 | RD14 — PORTD bit 14 |
| Pin 50 | RD15 — PORTD bit 15 |
| Pin 51 | VSS — Ground reference |
| Pin 52 | RE0 — PORTE bit 0 |
| Pin 53 | RE1 — PORTE bit 1 |
| Pin 54 | RE2 — PORTE bit 2 |
| Pin 55 | RE3 — PORTE bit 3 |
| Pin 56 | RE4 — PORTE bit 4 |
| Pin 57 | RE5 — PORTE bit 5 |
| Pin 58 | RE6 — PORTE bit 6 |
| Pin 59 | RE7 — PORTE bit 7 |
| Pin 60 | AVDD — Analog power supply |
| Pin 61 | AVSS — Analog ground reference |
| Pin 62 | RF0 — PORTF bit 0 |
| Pin 63 | RF1 — PORTF bit 1 |
| Pin 64 | RF2 — PORTF bit 2 |
| Pin 65 | RF3 — PORTF bit 3 |
| Pin 66 | RF4 — PORTF bit 4 |
| Pin 67 | RF5 — PORTF bit 5 |
| Pin 68 | RF6 — PORTF bit 6 |
| Pin 69 | RF7 — PORTF bit 7 |
| Pin 70 | RG0 — PORTG bit 0 |
| Pin 71 | RG1 — PORTG bit 1 |
| Pin 72 | RG2 — PORTG bit 2 |
| Pin 73 | RG3 — PORTG bit 3 |
| Pin 74 | RG6 — PORTG bit 6 |
| Pin 75 | RG7 — PORTG bit 7 |
| Pin 76 | RG8 — PORTG bit 8 |
| Pin 77 | RG9 — PORTG bit 9 |
| Pin 78 | MCLR — Master Clear (reset, active low) |
| Pin 79 | VDD — Positive digital supply |
| Pin 80 | VSS — Ground reference |
Typical Applications
PIC24FJ256GA108T-I/PT is suitable for 6 applications: Low-Power Industrial Sensor Hub, Portable Medical Data Logger, USB Human-Interface Device Controller, Battery-Powered IoT Sensor Node, Automotive Body Electronics (Non-AEC-Q100), HMI Panel Controller.
Low-Power Industrial Sensor Hub
The PIC24FJ256GA108T-I/PT is well suited for industrial sensor hubs aggregating multiple Modbus RTU or BACnet nodes because its 256 KB Flash accommodates full protocol stacks plus application logic without external memory. Three I2C, three SPI, and four UART ports allow parallel connection of multi-axis accelerometers, environmental sensors, and RS-485 transceivers without an external bus expander. The 12-bit ADC with up to 16 channels supports direct 4-20 mA current loop measurement through precision shunt resistors. Standby current below 100 nA permits battery or energy-harvested operation across multi-year field deployments, and the industrial -40C to +85C rating covers outdoor enclosure environments.
Recommended
Portable Medical Data Logger
Medical data loggers benefit from the PIC24FJ256GA108T-I/PT combination of 256 KB Flash (suffices for months of timestamped vital-sign records), 16 KB SRAM for DMA-buffered sample streaming, and a hardware RTCC with calendar that survives deep sleep at <100 nA. The 12-bit ADC samples ECG, SpO2, or temperature channels with adequate fidelity while the eXtreme Low Power modes let the device idle between patient measurements. The 32 MHz CPU runs at 16 MIPS, which is sufficient for FFT-based heart-rate variability analysis. Five 16-bit timers drive PWM-driven haptic feedback and LCD bias generation in a single integrated design.
Recommended
USB Human-Interface Device Controller
HID peripherals such as industrial keypads, programmable function keypads, and barcode scanners use the PIC24FJ256GA108T-I/PT as the controller because of its 256 KB Flash for full HID descriptor stacks plus vendor-specific report handlers, 32 MHz CPU that handles USB polling at 1 ms intervals without starving the application layer, and PPS that places USB D+/D- on convenient package pins. The 16 KB RAM holds HID ring buffers and key-debounce state machines comfortably. If higher USB throughput or on-the-go is required, designers should consider PIC24FJ192GB108-I/PT instead, which integrates a USB 2.0 OTG controller in the same TQFP-80 footprint.
Recommended
Battery-Powered IoT Sensor Node
IoT sensor nodes benefit from the PIC24FJ256GA108T-I/PT ultra-low standby current (<100 nA in RTCC mode) and generous 256 KB Flash that fits compressed LoRaWAN or Zigbee protocol stacks. The four UARTs permit simultaneous GPS module, cellular modem, and BLE module attachment, while three SPIs handle SPI radio transceivers and external Flash storage. The 32 MHz core decodes encrypted payloads and runs AES acceleration in software without missing UART or radio interrupts. With a 2500 mAh CR2477 battery and 1% duty cycle, field deployments exceeding 10 years are achievable, with the industrial -40C to +85C rating suiting outdoor and cold-chain logistics.
Recommended
Automotive Body Electronics (Non-AEC-Q100)
Body control modules in non-safety-critical zones benefit from the PIC24FJ256GA108T-I/PT 32 MHz CPU, 16 KB RAM, and 3x SPI for CAN-to-LIN gateway multiplexing. PPS simplifies PCB routing across 69 GPIO, allowing tail-light controllers, mirror-adjust drivers, and door-module networks to share a single BOM. The hardware RTCC supports wake-on-calendar for scheduled HVAC preconditioning, and the 12-bit ADC reads HVAC thermistor and battery sense channels with sufficient accuracy. The industrial temperature grade covers cabin and trunk-mounted enclosures. For ASIL-rated modules, designers should consider PIC24/dsPIC33 AEC-Q100 variants in the same family.
Recommended
HMI Panel Controller
Human-machine interface panels with segmented or character LCDs use the PIC24FJ256GA108T-I/PT because of its 256 KB Flash supporting full emWin or proprietary GUI stacks, 16 KB SRAM backing display buffers, and PPS routing five 16-bit timer PWMs to multiple backlight and contrast control pins. The 32 MHz core drives SPI TFT controllers at 32 MHz SPI clock while updating touch sensing via dedicated timers. Five 16-bit timers can drive eight-channel capacitive-touch scanning with no additional silicon. The TQFP-80 12x12 mm footprint is hand-solderable for prototype builds and reflow-compatible for volume production.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ256GA108T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ256GA108-I/PT | PIC24FJ128GA108-I/PT | PIC24FJ192GA108T-I/PT | PIC24FJ256DA206-I/PT | PIC24FJ192GB108-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-80 (12x12 mm) | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same |
| Flash | 256 KB | 256 KB | 128 KB | 192 KB | 256 KB | 192 KB |
| SRAM | 16 KB | 16 KB | 8 KB | 16 KB | 16 KB | 16 KB |
| Max 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 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 |
| USB Controller | No | No | No | No | No | USB 2.0 OTG integrated |
| LCD Driver | No | No | No | No | 96 segments integrated | No |
| Communication Interfaces | 3x I2C, 3x SPI, 4x UART | 3x I2C, 3x SPI, 4x UART | 3x I2C, 3x SPI, 4x UART | 3x I2C, 3x SPI, 4x UART | 3x I2C, 3x SPI, 4x UART | 3x I2C, 3x SPI, 4x UART |
| 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 | -40 C to +85 C |
| RoHS / Lead-Free | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Same silicon, but T/R packaging variant for SMT assembly (vs PIC24FJ256GA108-I/PT)
- More Flash at same package footprint (vs PIC24FJ128GA108-I/PT)
- More peripherals at same footprint (vs PIC24FJ256DA206-I/PT)
Design Notes
Decouple every VDD pin with a 100 nF X7R ceramic placed within 3 mm of the pin, plus a bulk 10 uF tantalum or aluminum polymer cap near the device. Provide a separate 100 nF cap on AVDD tied to AVSS to minimize ADC reference noise. For deep-sleep operation, drive MCLR high before entering Sleep mode to avoid unintended resets and ensure the RTCC oscillator keeps running to enable calendar wake-ups.
Route AVSS as a separate ground island that joins the digital VSS only at a single point under the IC's exposed pad or nearest VSS pin. Keep analog traces away from switching nodes and clamp diodes. PPS signal assignments should be planned during PCB layout so high-speed peripherals (SPI, UART) are routed on short, impedance-controlled paths; revisit the pinout after board placement to avoid crossing noisy traces.
Estimated: at 32 MHz CPU clock with all peripherals active, core current draw is approximately 15-20 mA at 3.3V - a 10% linear regulator with adequate headroom is required. Do not exceed VDD+0.3V on any digital I/O pin; do not draw more than 25 mA combined from any single VDD/VSS pair. Configuration bits (FOSC, FWDT, WINDIS, etc.) must be set before code execution - leave a valid configuration pragma in every project, or use MPLAB X default configuration macros.
Place the programming/debug connector (ICSP) on the same board edge as the MCU with short, parallel traces for PGC/PGD to ensure reliable in-circuit programming. Add a 4.7 kohm pull-up to VDD on MCLR if not using a supervisor. For USB-equipped variants, route D+/D- as a 90 ohm differential pair with no stubs.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - automotive body-electronics designs should use AEC-Q100 variants in the family.
