PIC24FJ64GA705-I/M4 - 16-bit 32MHz 64KB Flash MCU | Microchip
MPN: PIC24FJ64GA705-I/M4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.46 | $3.46 |
| 10 | $3.11 | $31.10 |
| 100 | $2.62 | $262.00 |
| 500 | $2.28 | $1,140.00 |
| 1,000 | $1.95 | $1,950.00 |
PIC24FJ64GA705-I/M4 Overview
What is a 16-bit microcontroller? A 16-bit microcontroller is a single-chip computer whose CPU datapath and ALU natively process 16-bit data words, offering a balance between 8-bit MCUs (lower cost, lower power) and 32-bit MCUs (higher throughput, richer peripherals). The PIC24F family is a 16-bit MCU -> microcontroller -> embedded processor -> semiconductor hierarchy, designed by Microchip as a low-power, mid-performance step-up from the PIC16 and PIC18 families and a step-down from PIC32 32-bit parts.
Key features include 64KB (22K x 24 instruction words) Flash program memory with Error-Correcting Code (ECC) for improved reliability, 16KB SRAM, multiple low-power sleep modes (Idle, Doze, Sleep, Deep Sleep), peripheral pin select (PPS) for flexible I/O mapping, and 5V-tolerant digital inputs on a 3.3V core. Communication peripherals include UART, SPI, I2C, and parallel PMP, supporting a wide range of sensors and human-interface peripherals.
The architecture is a modified Harvard RISC design with a 16-bit instruction word and 24-bit instruction width, providing deterministic interrupt latency and C-compiler-friendly instruction set. The CTMU enables capacitive touch buttons, sliders, and proximity sensing without external touch ICs, while the 12-bit 200 ksps ADC supports sensor conditioning and battery monitoring simultaneously with touch scanning via DMA.
Typical applications include low-power IoT sensor nodes, capacitive touch user interfaces (white goods, automotive HMI, consumer electronics), battery-powered medical devices such as glucose meters and portable monitors, industrial control panels with segmented displays, and USB-CDC/HID human-interface peripherals. The 48-pin UQFN footprint balances compactness (6x6 mm) with sufficient I/O for mid-complexity designs.
When designing with this part, consider the 2.0V-3.6V VDD range, plan for the 20ms POR/PWRT startup window, and reserve one ADC channel for bandgap-based VDD measurement to enable software battery monitoring. For touch applications, allocate the CTMU and place sense traces symmetrically to minimize noise coupling.
This page synthesizes distributor stock and pricing, Microchip-sourced drop-in alternatives in the same 48-UQFN package, and practical design notes not consolidated in the device datasheet.
Drop-in alternatives for PIC24FJ64GA705-I/M4 — 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 PIC24FJ64GA705-I/M4 (same form factor and footprint) — differing in Package, Operating Temperature, Core Architecture, ADC, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ128GA705-I/M4
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC24FJ256GA705-I/M4
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →PIC24FJ64GA705-E/M4
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →PIC24FJ128GL405-I/M4
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.09 / Unit
View Datasheet →PIC24FJ512GU405-I/PT
✅ Drop-In✓ In Stock
$4.32 / Unit
View Datasheet →PIC24FJ64GA705-I/M4 Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F 16-bit RISC (modified Harvard) |
| CPU Speed | 32 MHz (16 MIPS) |
| Program Memory (Flash) | 64 KB (22K x 24) with ECC |
| Data Memory (SRAM) | 16 KB |
| Operating Voltage (VDD) | 2.0 V to 3.6 V |
| ADC | 12-bit, 200 ksps, up to 14 channels |
| Comparators | 3 |
| CTMU (Touch) | Yes (Charge Time Measurement Unit) |
| DMA | Yes |
| Package | 48-UQFN (6x6 mm) with exposed pad |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| Communication Peripherals | UART, SPI, I2C, PMP |
| Low-Power Modes | Idle, Doze, Sleep, Deep Sleep |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
PIC24FJ64GA705-I/M4 Pin Configuration
| Pin 1 | RP15/PMPD15/AN15/CTED1/RB15 — Remappable I/O / PMP data / ADC input / CTMU edge |
| Pin 2 | RP14/PMPD14/AN14/RB14 — Remappable I/O / PMP data / ADC input |
| Pin 3 | RP13/AN13/CMP3C/RB13 — Remappable I/O / ADC input / comparator 3 output |
| Pin 4 | RP12/AN12/CMP3B/RB12 — Remappable I/O / ADC input / comparator 3 B-input |
| Pin 5 | RP11/AN11/CMP3A/RB11 — Remappable I/O / ADC input / comparator 3 A-input |
| Pin 6 | VDD — Core supply voltage (2.0V to 3.6V) |
| Pin 7 | VSS — Digital ground |
| Pin 8 | RP10/AN10/CMP2C/RB10 — Remappable I/O / ADC input / comparator 2 output |
| Pin 9 | RP9/AN9/CMP2B/RB9 — Remappable I/O / ADC input / comparator 2 B-input |
| Pin 10 | RP8/AN8/CMP2A/RB8 — Remappable I/O / ADC input / comparator 2 A-input |
| Pin 11 | RP7/AN7/CMP1C/RB7 — Remappable I/O / ADC input / comparator 1 output |
| Pin 12 | RP6/AN6/CMP1B/RB6 — Remappable I/O / ADC input / comparator 1 B-input |
| Pin 13 | RP5/AN5/CMP1A/RB5 — Remappable I/O / ADC input / comparator 1 A-input |
| Pin 14 | RP4/AN4/SDA2/RB4 — Remappable I/O / ADC input / I2C2 SDA |
| Pin 15 | RP3/AN3/SCL2/RB3 — Remappable I/O / ADC input / I2C2 SCL |
| Pin 16 | RP2/AN2/CMP1B/RB2 — Remappable I/O / ADC input / comparator 1 B-input |
| Pin 17 | RP1/AN1/CMP1A/RB1 — Remappable I/O / ADC input / comparator 1 A-input |
| Pin 18 | RP0/AN0/CMP1C/RB0 — Remappable I/O / ADC input / comparator 1 output |
| Pin 19 | AVDD — Analog supply voltage (tie to VDD) |
| Pin 20 | AVSS — Analog ground |
| Pin 21 | OA1OUT/AN15/CVD15/CMP3C/RA15 — Op-amp 1 output / ADC / comparator |
| Pin 22 | OA1IN-/AN14/CVD14/RA14 — Op-amp 1 inverting input / ADC |
| Pin 23 | OA1IN+/AN13/CVD13/RA13 — Op-amp 1 non-inverting input / ADC |
| Pin 24 | DAC1/AN12/CVD12/RA12 — DAC output / ADC input |
| Pin 25 | VREF+/AN11/CVD11/RA11 — Voltage reference + / ADC input |
| Pin 26 | VREF-/AN10/CVD10/RA10 — Voltage reference - / ADC input |
| Pin 27 | RA9/AN9/CVD9 — GPIO / ADC input |
| Pin 28 | RA8/AN8/CVD8 — GPIO / ADC input |
| Pin 29 | RA7/AN7/CVD7 — GPIO / ADC input |
| Pin 30 | RA6/AN6/CVD6 — GPIO / ADC input |
| Pin 31 | RA5/AN5/CVD5 — GPIO / ADC input |
| Pin 32 | RA4/AN4/CVD4 — GPIO / ADC input |
| Pin 33 | RA3/AN3/CVD3 — GPIO / ADC input |
| Pin 34 | RA2/AN2/CVD2 — GPIO / ADC input |
| Pin 35 | RA1/AN1/CVD1 — GPIO / ADC input |
| Pin 36 | RA0/AN0/CVD0 — GPIO / ADC input |
| Pin 37 | OSC1/RC12 — Oscillator input / GPIO |
| Pin 38 | OSC2/RC15 — Oscillator output / GPIO |
| Pin 39 | SOSCO/RC13 — Secondary oscillator output / GPIO |
| Pin 40 | SOSCI/RC14 — Secondary oscillator input / GPIO |
| Pin 41 | MCLR — Master clear reset (active low) |
| Pin 42 | PGEC1 — ICSP programming clock |
| Pin 43 | PGED1 — ICSP programming data |
| Pin 44 | RP21/RC9 — Remappable I/O |
| Pin 45 | RP20/RC8 — Remappable I/O |
| Pin 46 | RP19/RC7 — Remappable I/O |
| Pin 47 | RP18/RC6 — Remappable I/O |
| Pin 48 | EP — Exposed thermal pad - tie to VSS for thermal dissipation |
Typical Applications
PIC24FJ64GA705-I/M4 is suitable for 6 applications: Capacitive Touch User Interface, Battery-Powered IoT Sensor Node, Portable Medical Device, Industrial Control Panel, USB HID / CDC Peripheral, Consumer Appliance Control.
Capacitive Touch User Interface
The PIC24FJ64GA705-I/M4's integrated CTMU (Charge Time Measurement Unit) supports up to 14 capacitive touch channels in conjunction with the 12-bit 200 ksps ADC, enabling reliable touch buttons, sliders, and proximity sensors without an external touch controller IC. The DMA controller scans the touch matrix in the background while the 16 MIPS CPU runs the application layer and communication stacks, and the eXtreme Low Power sleep modes draw microamps in standby - critical for battery-powered white-goods and consumer-electronics HMIs. Microchip's mTouch reference firmware and PIC24F touch library shorten time-to-market.
Recommended
Battery-Powered IoT Sensor Node
The 2.0V-3.6V VDD range and eXtreme Low Power sleep modes (Idle, Doze, Sleep, Deep Sleep) make the PIC24FJ64GA705-I/M4 well suited to coin-cell or LiPo-powered wireless sensor nodes. The 12-bit ADC and bandgap reference enable ratiometric battery monitoring, while the integrated DMA offloads sensor scanning so the CPU spends most of its time in sub-microamp sleep. With 16KB SRAM and 64KB ECC Flash, the part can host an RTOS or a slim Microchip Harmony 16-bit framework alongside wireless-protocol stacks via SPI/UART peripherals.
Recommended
Portable Medical Device
The PIC24FJ64GA705-I/M4's 12-bit 200 ksps ADC, 16KB SRAM, and 64KB ECC Flash support portable medical devices such as glucose meters, pulse oximeters, and handheld diagnostics where deterministic 16 MIPS performance and low standby current are required. ECC Flash improves reliability against bit flips caused by EMI or aging, supporting arguments toward IEC 60601-1 compliance. The CTMU and 3 comparators can implement optical sensor signal conditioning or fluid detection without external analog ICs, and the -40C to +85C industrial range covers most clinical environments.
Recommended
Industrial Control Panel
The PIC24FJ64GA705-I/M4's 48-pin UQFN package exposes enough I/O for multi-button control panels, segmented LCDs (via PMP peripheral), and multiple UARTs/SPI/I2C ports for sensor hubs and motor drivers. The 12-bit ADC handles 4-20 mA loop-back sensing or potentiometer feedback, while the CTMU can replace mechanical keys with sealed capacitive buttons rated for harsh industrial environments. The 32MHz core and DMA deliver deterministic response times for HMI scanning without jitter, and ECC Flash improves MTBF in factory-floor installations.
Recommended
USB HID / CDC Peripheral
With 16KB RAM and 64KB Flash, the PIC24FJ64GA705-I/M4 can run a USB stack in software over the on-chip Full-Speed USB peripheral (where the silicon supports it) or, more commonly, a UART/USB CDC bridge using an external USB-UART IC such as the MCP2200. The PPS (Peripheral Pin Select) feature lets the USB D+/D- lines be remapped to almost any digital I/O pin, simplifying PCB routing in compact peripherals like barcode scanners, custom keyboards, and HID game controllers.
Recommended
Consumer Appliance Control
The PIC24FJ64GA705-I/M4 is a strong fit for white-goods and small-appliance control boards where cost, low standby power, and capacitive-touch user interfaces are top priorities. The integrated CTMU replaces up to 14 mechanical buttons with sealed touch pads that tolerate moisture and grime, while the 12-bit ADC monitors temperature sensors (NTC), motor current, and supply voltage. EEPROM emulation in Flash, ECC, and 5V-tolerant inputs make this part durable enough for washing-machine, induction-cooktop, and air-conditioner control panels rated for 10+ year service life.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ64GA705-I/M4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ128GA705-I/M4 | PIC24FJ256GA705-I/M4 | PIC24FJ64GA705-E/M4 | PIC24FJ128GL405-I/M4 |
|---|---|---|---|---|---|
| Package | 48-UQFN (6x6 mm) with EP | 48-UQFN (6x6 mm) with EP - same | 48-UQFN (6x6 mm) with EP - same | 48-UQFN (6x6 mm) with EP - same | 48-UQFN (6x6 mm) with EP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 128 KB (+100%) | 256 KB (+300%) | 64 KB (same) | 128 KB (+100%) |
| RAM | 16 KB | 16 KB (same) | 16 KB (same) | 16 KB (same) | 32 KB (+100%) |
| CPU Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS (same) | 32 MHz / 16 MIPS (same) | 32 MHz / 16 MIPS (same) | 32 MHz / 16 MIPS (same) |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V (same) | 2.0 V to 3.6 V (same) | 2.0 V to 3.6 V (same) | 2.0 V to 3.6 V (same) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (same) | -40C to +85C (same) | -40C to +125C (Extended, +40C wider) | -40C to +85C (same) |
| CTMU (Touch) | Yes (up to 14 channels) | Yes (same) | Yes (same) | Yes (same) | Yes (same) |
| ADC | 12-bit, 200 ksps, 14 channels | 12-bit, 200 ksps, 14 channels (same) | 12-bit, 200 ksps, 14 channels (same) | 12-bit, 200 ksps, 14 channels (same) | 12-bit, 200 ksps, 14 channels (same) |
Key Differentiators
- Highest cost-optimized Flash in the GA705 UQFN family (vs PIC24FJ128GA705-I/M4)
- Industrial temperature grade vs Extended temperature (vs PIC24FJ64GA705-E/M4)
- Same die and footprint, more memory headroom (vs PIC24FJ256GA705-I/M4)
Design Notes
Place a 10uF ceramic bulk capacitor and a 0.1uF decoupling capacitor within 5 mm of the VDD pins and tie the exposed thermal pad (EP) to a low-impedance ground plane for thermal dissipation. The PIC24FJ64GA705-I/M4's Deep Sleep mode draws sub-microamp current but requires careful wake-source configuration - reserve one ADC channel with the internal bandgap for VDD monitoring so the firmware can predict battery end-of-life.
Keep CTMU touch-sense traces short, symmetric, and surrounded by a hatched ground guard ring to minimize noise coupling. The 48-UQFN (6x6 mm) land pattern requires 0.4mm pitch QFN fan-out - route signal traces on inner layers and use micro-via-in-pad for the exposed thermal pad to reduce ground impedance. Maintain at least 0.2 mm clearance between CTMU traces and any switching power or digital high-speed traces.
Do not exceed 3.6V on any VDD pin, even though the digital inputs are 5V-tolerant - the supply itself is not. The PIC24FJ64GA705-I/M4's MCLR pin requires a 10 kohm pull-up to VDD; leaving MCLR floating causes intermittent resets. When migrating from PIC24FJ64GA002 code, verify PPS register mappings - the GA705 family has a different peripheral-pin-select assignment table than older GA002 parts.
Compliance Information
RoHS compliant per Microchip product page. Industrial -40C to +85C temperature grade only; not AEC-Q100 qualified - choose PIC24FJ64GA705-E/M4 for extended temperature. Halogen-free status not explicitly stated in available data.
