PIC24F32KA301T-I/SS - 16-bit XLP MCU, 32KB Flash, 20-SSOP | Microchip
MPN: PIC24F32KA301T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.21 | $3.21 |
| 10 | $2.89 | $28.90 |
| 100 | $2.51 | $251.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.92 | $1,920.00 |
PIC24F32KA301T-I/SS Overview
What is an XLP microcontroller? An XLP (eXtreme Low Power) MCU is a class of microcontroller that integrates ultra-low-power peripherals - real-time clock/calendar, brown-out reset, watchdog timer, and deep-sleep wake sources - so that quiescent current can be held in the nanoampere range while still maintaining timing and supervisory functions. Within the broader taxonomy, the PIC24F32KA301 sits under 16-bit MCU -> Flash MCU -> low-power MCU -> Microchip PIC24F XLP family -> general purpose 20-/28-/44-/48-pin sub-family.
Key features include a 12-bit A/D converter with CTMU (Charge Time Measurement Unit) for capacitive touch and time-of-flight sensing, multiple communication peripherals (UART, SPI, I2C), 17 I/O ports, and an operating voltage range of 1.8 V to 3.6 V. The architecture is a 16-bit modified Harvard with a rich instruction set optimized for C code density, plus hardware multiply/divide and DSP-friendly instructions.
The 'T' suffix indicates Tape & Reel packaging and the 'I' suffix denotes the -40C to +85C industrial temperature grade; the 'SS' suffix denotes the SSOP-20 package. Typical applications span consumer IoT nodes, sensor hubs, remote controls, wearable health patches, and any line-powered or battery-operated embedded product that demands long battery life without sacrificing computational throughput.
Drop-in alternatives for PIC24F32KA301T-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 PIC24F32KA301T-I/SS (same form factor and footprint) — differing in Operating Temperature, Package, ADC, Program Memory (Flash), Core Architecture.
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PIC24F32KA301-I/SS
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View Datasheet →PIC24F16KM202-I/SS
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View Datasheet →PIC24F32KA301T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC 16-bit (modified Harvard) |
| Series | PIC24F XLP 24F |
| Program Memory (Flash) | 32 KB (11K x 24 words) |
| Data SRAM | 2 KB |
| EEPROM | 512 B |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Supply Voltage (VDD) | 1.8 V to 3.6 V |
| I/O Pins | 17 |
| ADC | 12-bit with CTMU |
| Communication | UART, SPI, I2C |
| Operating Temperature | -40C to +85C (Industrial, 'I' suffix) |
| Package | 20-pin SSOP (0.209 inch / 5.30 mm body width) |
| Mounting Type | Surface Mount |
| Low-Power Features | XLP, nanoWatt XLP, DSBOR, DSWDT, RTCC in Deep Sleep |
| RoHS Status | Compliant |
PIC24F32KA301T-I/SS Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, internal pull-up |
| Pin 2 | RA0 — Port A bit 0 (digital I/O, analog input) |
| Pin 3 | RA1 — Port A bit 1 (digital I/O, analog input) |
| Pin 4 | RB0 — Port B bit 0 (digital I/O, programming clock) |
| Pin 5 | RB1 — Port B bit 1 (digital I/O, programming data) |
| Pin 6 | RB2 — Port B bit 2 (digital I/O) |
| Pin 7 | RB3 — Port B bit 3 (digital I/O) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | VDD — Positive supply voltage (1.8 V to 3.6 V) |
| Pin 10 | RB4 — Port B bit 4 (digital I/O) |
| Pin 11 | RB5 — Port B bit 5 (digital I/O) |
| Pin 12 | RB6 — Port B bit 6 (digital I/O) |
| Pin 13 | RB7 — Port B bit 7 (digital I/O) |
| Pin 14 | RA2 — Port A bit 2 (digital I/O, analog input) |
| Pin 15 | RA3 — Port A bit 3 (digital I/O, analog input) |
| Pin 16 | RA4 — Port A bit 4 (digital I/O, analog input) |
| Pin 17 | RA5 — Port A bit 5 (digital I/O, analog input) |
| Pin 18 | RA6 — Port A bit 6 (digital I/O, oscillator) |
| Pin 19 | RA7 — Port A bit 7 (digital I/O, oscillator) |
| Pin 20 | VCAP — Internal voltage regulator output, connect 10uF to VSS |
Typical Applications
PIC24F32KA301T-I/SS is suitable for 6 applications: Battery-Powered IoT Sensor Node, Wearable Health Patch, Industrial Sensor Hub / Remote Monitoring, Consumer Remote Control / HMI, Smart Home Sensor Node, Automotive Interior Accessory (Non-Safety).
Battery-Powered IoT Sensor Node
The PIC24F32KA301T-I/SS is engineered for battery-powered IoT sensor nodes through its XLP technology delivering nanoampere-range Deep Sleep current while keeping RTCC, DSBOR and DSWDT active. With 32 KB Flash, 2 KB SRAM, and 16 MIPS throughput, the device can host a sensor-fusion state machine plus a lightweight LoRaWAN or BLE host stack while periodically waking to sample temperature, humidity, or motion sensors. Its 1.8-3.6 V supply range aligns directly with single-cell Li-ion, two AA cells, or 1.5 V solar-cell + supercap harvesting topologies, eliminating the need for a boost converter and extending coin-cell node lifetime to multi-year ranges. The 12-bit ADC with CTMU enables capacitive touch or time-of-flight wake-up sources without an external sensor IC.
Recommended
Wearable Health Patch
Wearable health patches demand low average current, small package, and integrated analog peripherals - all delivered by the PIC24F32KA301T-I/SS. The 20-pin SSOP package occupies under 30 mm^2 of PCB area, while the XLP Deep Sleep mode with active RTCC draws sub-microamp current between heart-rate or SpO2 samples. The 12-bit ADC with CTMU supports direct interfacing to photodiode current sources for optical heart-rate and pulse-oximetry measurement, removing the need for a dedicated analog front-end. Industrial -40C to +85C temperature grade ensures consistent operation against skin temperature variation. The 32 KB Flash accommodates a BLE/Bluetooth Low Energy host controller image plus a sensor-fusion library, and 2 KB SRAM is sufficient for rolling 4 KB sample buffers.
Recommended
Industrial Sensor Hub / Remote Monitoring
Industrial sensor hubs deployed on factory floors or in remote monitoring installations benefit from the PIC24F32KA301T-I/SS combination of -40C to +85C industrial temperature grade, XLP low-power operation, and 17 GPIO for multi-sensor aggregation. The MCU can sample analog inputs from pressure, flow, or vibration transducers via its 12-bit ADC and forward processed data through UART, SPI, or I2C to a wireless companion or isolated RS-485 transceiver. The 32 KB Flash stores MODBUS, CAN-on-UART, or proprietary field-bus protocol stacks alongside sensor-fusion algorithms, while the 2 KB SRAM supports circular buffers for streaming data. Housed in a SSOP-20 package, the device fits into DIN-rail or wall-mount sensor enclosures with minimal PCB footprint.
Recommended
Consumer Remote Control / HMI
Consumer remote controls and low-cost HMI panels benefit from the PIC24F32KA301T-I/SS XLP technology, integrated CTMU for capacitive touch buttons, and small SSOP-20 package. The 32 MIPS throughput is sufficient to drive IR or sub-GHz RF transmission protocols while polling a 12-button capacitive matrix with the CTMU peripheral - no external touch IC required. Deep Sleep current in the nanoampere range means two AAA cells can power the remote for the full warranty life of the consumer product. The 17 GPIO drives status LEDs, buzzer PWM, and rotary-encoder inputs without muxing. Industrial temperature grade ensures reliable operation in kitchens, garages, and outdoor patios where consumer remotes are commonly used.
Recommended
Smart Home Sensor Node
Smart home temperature, humidity, air-quality, and occupancy sensor nodes are ideal applications for the PIC24F32KA301T-I/SS. Its XLP Deep Sleep with active RTCC allows the device to wake once per minute to take a sensor reading and transmit via Zigbee, Z-Wave, or Wi-Fi companion IC, then return to sub-microamp sleep, drawing so little battery current that the primary cell outlasts the sensor's calibration interval. The 1.8-3.6 V supply range supports direct CR2032 / CR2477 coin-cell operation. The 32 KB Flash stores Zigbee 3.0 or Matter-over-Wi-Fi commissioning logic alongside application firmware. SSOP-20 packaging supports low-profile wall-mount designs less than 10 mm thick.
Recommended
Automotive Interior Accessory (Non-Safety)
Non-safety automotive interior accessories such as ambient lighting controllers, seat-heater keypads, USB-charger monitors, and door-pocket lighting can deploy the PIC24F32KA301T-I/SS within its -40C to +85C industrial envelope, supporting cabin-temperature swings from cold-soak winter mornings to direct-summer sun load. The 12-bit ADC reads NTC thermistors for seat-temperature feedback, the CTMU supports capacitive touch on door-pocket release handles, and the UART/SPI/I2C peripherals link to body-control modules over LIN or CAN-transceivers. For under-hood or direct-sunload applications above 85C, designers should select the 'E' suffix variant rated to +125C. SSOP-20 supports manual-assembly-friendly PCB layouts in low-volume accessory production.
Recommended
Recommended Products Summary
Engineering reference data for PIC24F32KA301T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24F32KA301-I/SS | PIC24F32KA302-I/SS | PIC24F16KA301T-I/SS | PIC24F16KM202-I/SS | PIC24F08KL401-E/SS |
|---|---|---|---|---|---|---|
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 16 KB | 16 KB | 8 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 1 KB | 1 KB | 1 KB |
| Maximum CPU Speed | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (8 MIPS) |
| Operating 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 | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| Low-Power Family | XLP with nanoWatt XLP | XLP with nanoWatt XLP | XLP with nanoWatt XLP | XLP with nanoWatt XLP | XLP | XLP |
Key Differentiators
- Doubles Flash and SRAM vs PIC24F16KA301T-I/SS within same SSOP-20 footprint (vs PIC24F16KA301T-I/SS)
- Industrial -40C to +85C rating vs Extended -40C to +125C for non-safety automotive (vs PIC24F08KL401-E/SS)
- nanoWatt XLP technology vs base XLP on KL family (vs PIC24F16KL401-I/MQ)
Design Notes
Estimated: At VDD = 3.3 V and full 32 MHz active CPU, the PIC24F32KA301T-I/SS active current is approximately 8-10 mA, so a low-dropout regulator with at least 50 mA headroom is recommended even if the rest of the board draws only a few mA. In Deep Sleep with RTCC active, current drops to the nanoampere range, so the regulator's quiescent current becomes the dominant system Iq - select an LDO or buck with sub-1 uA Iq for sleep-critical designs. Add a 1 uF ceramic bypass capacitor as close to the VDD pin as possible, plus a 10 uF bulk capacitor on the internal regulator VCAP pin (pin 20) per datasheet recommendation.
Place the 10 uF VCAP capacitor within 2-5 mm of pin 20 with a direct ground via, since the internal LDO's stability depends on low-impedance routing to VSS. Route MCLR with a 10 kohm pull-up to VDD and add a 100 nF capacitor to ground for noise immunity, especially in motor-control or relay-switched applications. Avoid routing high-frequency digital signals (SPI clock, PWM) directly under the SSOP-20 footprint to prevent coupling into the analog ADC inputs on the same die.
Do not exceed the absolute maximum VDD of 4.0 V or the MCU will suffer permanent damage - any LDO output above 3.6 V under load transient must be avoided. When migrating from PIC24F32KA301 (SSOP-20) to PIC24F32KA302 (28-pin), do not assume the SSOP-20 pinout remains valid - verify pin remapping in the family datasheet's I/O port section. When using CTMU for capacitive touch, calibrate the ADC offset at every power-up since temperature drift can shift the touch threshold by 5-10% across the -40C to +85C range. Finally, ensure unused I/O pins are configured as outputs driving low (not inputs floating) to minimize sleep current leakage.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose AEC-Q100-qualified PIC24FJ variants for safety-critical automotive applications.
