PIC24F32KA302-I/SS - 16-bit 32MHz 32KB Flash XLP MCU 28-SSOP
MPN: PIC24F32KA302-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.32 | $5.32 |
| 10 | $4.85 | $48.50 |
| 100 | $4.12 | $412.00 |
| 500 | $3.65 | $1,825.00 |
| 1,000 | $3.2 | $3,200.00 |
PIC24F32KA302-I/SS Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, peripherals, and I/O. The PIC24F KA family sits in the 16-bit tier of Microchip's PIC microcontroller portfolio (8-bit PIC10/12/16/18 -> 16-bit PIC24F/dsPIC33 -> 32-bit PIC32), bridging small 8-bit designs and high-performance 32-bit applications. The XLP technology adds deep-sleep operating modes (DSBOR, DSWDT, RTCC) that keep the device drawing microamps while still monitoring real-time clocks and watchdog timers - essential for IoT and wearable deployments.
Key features include a 12-bit ADC with up to 9 channels, 3 op amps, a CTMU (Charge Time Measurement Unit) for capacitive touch sensing, 5 timers, 2 UART/I2C/SPI modules, and 17 general-purpose I/O pins. XLP technology enables deep sleep currents below 20 nA with RTCC and full SRAM retention, while active current is typically 8 µA/MIPS. Integrated peripherals eliminate external components, reducing BOM and board area.
The PIC24F KA core uses a modified Harvard architecture with a 16-bit data path and 24-bit instruction word, optimized for C-compiled code via the MPLAB XC16 toolchain. The CTMU and op amps support touch buttons, sliders, and proximity sensors without external analog ICs. The 32 MHz FRC oscillator with PLL provides ±2% accuracy without external crystals, simplifying low-cost designs.
Typical applications include IoT sensor nodes, wearable fitness bands, battery-powered medical devices, remote controls, and capacitive touch user interfaces. The wide operating voltage (1.8V-3.6V) and low sleep current make it ideal for solar or coin-cell powered systems.
When designing with this part, pay attention to the configuration bits, which lock oscillator mode and watchdog behavior. The CTMU requires a calibration step to achieve accurate capacitance measurements. Use the MPLAB Code Configurator (MCC) plug-in to generate peripheral drivers automatically.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC24F32KA302-I/SS — 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 PIC24F32KA302-I/SS (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Core, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24F32KA302T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24F32KA302-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24F32KA301-I/SS
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →PIC24F32KA302-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC24F 16-bit RISC |
| Program Memory (Flash) | 32 KB (11K x 24 instructions) |
| SRAM | 2 KB |
| EEPROM | 512 bytes |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Supply Voltage Range | 1.8 V to 3.6 V |
| I/O Pins | 17 |
| ADC | 12-bit, up to 9 channels |
| Op Amps | 3 (integrated) |
| CTMU | Yes (Charge Time Measurement Unit) |
| Timers | 5 (16-bit/32-bit) |
| UART/I2C/SPI | 2 modules |
| Package | 28-SSOP |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC24F32KA302-I/SS Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, active-low |
| Pin 2 | RA0 — Digital I/O / analog input AN0 |
| Pin 3 | RA1 — Digital I/O / analog input AN1 / op amp output |
| Pin 4 | RA2 — Digital I/O / analog input AN2 / op amp output |
| Pin 5 | RA3 — Digital I/O / analog input AN3 |
| Pin 6 | RA4 — Digital I/O / analog input AN4 |
| Pin 7 | RA5 — Digital I/O / analog input AN5 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1 — Crystal oscillator input or external clock |
| Pin 10 | OSC2 — Crystal oscillator output |
| Pin 11 | RB0 — Digital I/O / programming PGED1 |
| Pin 12 | RB1 — Digital I/O / programming PGEC1 |
| Pin 13 | VDD — Positive supply voltage |
| Pin 14 | RB2 — Digital I/O |
| Pin 15 | RB3 — Digital I/O |
| Pin 16 | RB4 — Digital I/O |
| Pin 17 | RB5 — Digital I/O |
| Pin 18 | RB6 — Digital I/O / ICSPCLK |
| Pin 19 | VSS — Ground reference |
| Pin 20 | RB7 — Digital I/O / ICSPDAT |
| Pin 21 | RC0 — Digital I/O |
| Pin 22 | RC1 — Digital I/O |
| Pin 23 | RC2 — Digital I/O |
| Pin 24 | RC3 — Digital I/O |
| Pin 25 | RC4 — Digital I/O |
| Pin 26 | RC5 — Digital I/O |
| Pin 27 | RC6 — Digital I/O |
| Pin 28 | VDD — Positive supply voltage |
Typical Applications
PIC24F32KA302-I/SS is suitable for 6 applications: IoT Sensor Node with BLE/Zigbee, Wearable Fitness and Health Tracker, Capacitive Touch User Interface, Battery-Powered Medical Device, Industrial Sensor and Control Module, Remote Control and Consumer HMI.
IoT Sensor Node with BLE/Zigbee
The PIC24F32KA302-I/SS is well-suited for battery-powered IoT sensor nodes. Its 32 KB Flash accommodates small BLE or Zigbee protocol stacks while 2 KB SRAM handles sensor data buffering. The 16 MIPS performance processes sensor fusion algorithms and the 12-bit ADC with 9 channels interfaces directly to temperature, humidity, and motion sensors. XLP deep sleep at 20 nA with RTCC enables multi-year coin-cell life; the integrated op amps condition analog sensor signals without external ICs. Pair with a Bluetooth module on UART for wireless connectivity.
Recommended
Wearable Fitness and Health Tracker
Wearable fitness bands benefit from PIC24F32KA302-I/SS XLP technology, achieving weeks of battery life on small Li-ion cells. The integrated 12-bit ADC samples heart-rate, SpO2, and motion sensors; the CTMU enables capacitive touch buttons for user input without mechanical switches. Three integrated op amps amplify low-level biopotential signals. The 1.8V-3.6V range supports single-cell Li-ion directly. Wearable designs leverage the 28-SSOP compact footprint for slim form factors.
Recommended
Capacitive Touch User Interface
The CTMU and three integrated op amps make PIC24F32KA302-I/SS ideal for capacitive touch buttons, sliders, and proximity sensors. The CTMU measures capacitance changes with femtofarad resolution via timed charge transfer. Combined with the 12-bit ADC and op amps, the MCU detects touch through glass or plastic overlays without dedicated touch ICs. The 28-SSOP package supports compact HMI panels in white goods, consumer electronics, and industrial controls. MPLAB Code Configurator generates touch firmware libraries.
Recommended
Battery-Powered Medical Device
Medical devices such as portable glucose meters, pulse oximeters, and digital thermometers benefit from PIC24F32KA302-I/SS low-power operation and integrated peripherals. The 12-bit ADC achieves medical-grade measurement accuracy; the op amps amplify sensor signals directly. XLP sleep modes below 20 nA extend battery life, critical for compliance with IEC 60601-1 patient safety standards. The industrial temperature range (-40°C to +85°C) supports operation in varied conditions.
Recommended
Industrial Sensor and Control Module
Industrial 4-20mA loop-powered sensors, HVAC controllers, and building automation nodes leverage PIC24F32KA302-I/SS wide operating voltage (1.8V-3.6V) and integrated peripherals. The 12-bit ADC reads process variables, op amps condition 4-20mA signals, and serial modules (UART/I2C/SPI) communicate with industrial networks. XLP technology reduces sleep current below 1 µA, enabling Energy Harvesting wireless sensor nodes powered by solar or thermal gradients.
Recommended
Remote Control and Consumer HMI
TV remotes, smart home controllers, and consumer HMIs benefit from PIC24F32KA302-I/SS capacitive touch and ultra-low sleep current. The CTMU implements touch keypads without mechanical buttons, increasing reliability. UART/SPI interfaces connect to infrared LEDs, RF modules, or display drivers. The 32 KB Flash stores complex IR code libraries, BLE pairing data, or multi-language UI strings. RoHS compliance and lead-free packaging meet consumer product environmental requirements.
Recommended
Recommended Products Summary
Engineering reference data for PIC24F32KA302-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24F32KA302T-I/SS | PIC24F32KA302-E/SS | PIC24F32KA301-I/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 512 B | 512 B | 512 B | 512 B |
| Maximum Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +125°C | -40°C to +85°C |
| CTMU (Capacitive Touch) | Yes | Yes | Yes | No |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Approx. Price (qty 100, USD) | $4.12 | $4.12 | $5.10 | $3.95 |
Key Differentiators
- Industrial-grade -40°C to +85°C with XLP nanoWatt technology (vs PIC24F32KA302-E/SS)
- Full CTMU + 3 integrated op amps for capacitive touch (vs PIC24F32KA301-I/SS)
- Surface-mount 28-SSOP package for production assembly (vs PIC24F32KA302-I/SP)
Design Notes
Estimated: at 32 MHz active mode with all peripherals on, the PIC24F32KA302-I/SS draws approximately 8 mA. For battery-powered designs, use the 8 MHz FRC + PLL configuration to halve active current while preserving throughput, or duty-cycle the CPU using the RTCC wake-up timer. Deep sleep current of 20 nA enables multi-year coin-cell operation. Decouple VDD pins (13 and 28) with 100 nF ceramic capacitors placed within 5 mm of the package.
The PIC24F32KA302-I/SS industrial temperature range is -40°C to +85°C. The 28-SSOP package has a thermal resistance (theta_JA) of approximately 95 °C/W. Estimated: at 8 mA active and 3.3V, internal dissipation is 26 mW, yielding a junction temperature rise of 2.5 °C above ambient - well within safe limits. For high-temperature industrial environments, use the PIC24F32KA302-E/SS variant rated to +125 °C.
Place decoupling capacitors (100 nF ceramic) directly adjacent to VDD pins 13 and 28, with ground returns to the nearest VSS pin (8 or 19) using short traces. For ADC accuracy, route analog signals (AN0-AN5) away from digital switching traces, and use a ground plane under the analog section. The ICSP programming pins (RB6/RB7) require 4.7 kΩ pull-ups to VDD for reliable in-circuit programming.
Configuration bits must be set correctly in code; failure to configure the oscillator mode can leave the device in an undefined state. The MCLR pin (pin 1) requires a 10 kΩ pull-up to VDD for normal operation - leaving it floating causes intermittent resets. The CTMU requires firmware calibration to convert timer ticks to capacitance; refer to Microchip AN1250 for the calibration sequence.
Compliance Information
RoHS compliant and lead-free per Microchip product page. AEC-Q100 not qualified (industrial grade only). Conflict minerals statement available from Microchip. Halogen-free status not explicitly listed in retrieved data.
