PIC24F08KL402-I/SP - 16-bit 32MHz MCU 8KB Flash 28-SPDIP | Microchip
MPN: PIC24F08KL402-I/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.99 | $1.99 |
| 10 | $1.78 | $17.80 |
| 100 | $1.49 | $149.00 |
| 500 | $1.32 | $660.00 |
| 1,000 | $1.18 | $1,180.00 |
PIC24F08KL402-I/SP Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O. The PIC24F uses Microchip's 16-bit modified-Harvard architecture with a 16-bit-wide instruction path and a 24-bit-wide instruction word, delivering roughly 2x to 5x the throughput of PIC18 8-bit parts at the same clock while remaining C-friendly. The KL402 sits at the entry level of the KL4 sub-family, designed as a cost-optimized migration path from PIC18 designs thanks to compatible peripherals such as MSSP (I²C/SPI), CCP/ECCP, and the same core register model.
Key features of the PIC24F08KL402 include nanoWatt XLP technology for eXtreme Low Power consumption (deep-sleep currents in the nanoamp range), four 16-bit timers, two UART modules, one I²C/SPI MSSP, up to 25 mA source/sink per I/O, and a 10-bit 1.1 Msps ADC. The device supports In-Circuit Serial Programming (ICSP) and In-Circuit Debug (ICD) via two standard pins, enabling field firmware updates and low-cost development. A wide operating range of 1.8 V to 3.6 V allows direct connection to single-cell Li-ion, two-AA, or 3.3 V regulated rails.
Architecturally, the KL4 core uses a single-cycle hardware multiply, a 17-bit × 17-bit MAC for DSP-style operations, and a 16-element working register array. The MSSP block reuses the familiar PIC18 SPI/I²C controller, easing code porting. The 10-bit successive-approximation ADC has a dedicated FRC oscillator and supports automatic Channel Scan and Buffer Mode. Internal oscillators are accurate to within ±2 % across temperature, eliminating the need for an external crystal in most designs.
Typical applications for the PIC24F08KL402-I/SP include low-power IoT sensor nodes, battery-powered consumer devices, low-cost motor-control loops (small DC and stepper), home appliances, e-metering accessories, USB-to-UART bridges (when paired with an external transceiver), and industrial control user-interface panels. The 28-SPDIP package is especially favored for prototype breadboarding, hobbyist designs, and through-hole production assemblies where socketed replacement or hand rework is required.
When designing with this MCU, note that the 28-SPDIP variant exposes 25 general-purpose I/O. For surface-mount or smaller-footprint designs, Microchip offers the same silicon in PIC24F08KL402-I/SS (28-SSOP), PIC24F08KL402-I/SO (28-SOIC), and PIC24F08KL402-I/ML (28-QFN) packages. The 'I' industrial temperature grade is the right choice for -40 °C to +85 °C environments; switch to the 'E' extended grade for -40 °C to +125 °C automotive or industrial high-temperature applications.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical engineering design notes not found in the manufacturer datasheet alone, giving procurement and design engineers a faster path to qualification.
Drop-in alternatives for PIC24F08KL402-I/SP — 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 PIC24F08KL402-I/SP (same form factor and footprint) — differing in ADC, Operating Temperature, Package, I/O Pins, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24F16KL402-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24F08KL402-E/SP
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC24F08KL401-I/SS
✅ Drop-In✓ In Stock
$1.6 / Unit
View Datasheet →PIC24F08KL401-E/SS
✅ Drop-In✓ In Stock
$1.69 / Unit
View Datasheet →PIC24F08KL301-E/SS
✅ Drop-In✓ In Stock
$1.84 / Unit
View Datasheet →PIC24F08KA102T-I/SS
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →PIC24F04KL101-I/SO
✅ Drop-In✓ In Stock
$1.05 / Unit
View Datasheet →PIC24F08KL402-I/SP Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit PIC24F modified-Harvard |
| CPU Family | PIC PIC® XLP™ 24F KL4 |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Program Memory (Flash) | 8 KB (2.75K x 24 words) |
| Data Memory (SRAM) | 1 KB |
| EEPROM | 512 bytes |
| Operating Voltage Range | 1.8 V to 3.6 V |
| ADC | 10-bit, up to 12 channels, 1.1 Msps |
| Timers | 4 x 16-bit |
| UART Modules | 2 |
| I²C/SPI (MSSP) | 1 |
| Capture/Compare/PWM | CCP + ECCP |
| I/O Pins | 25 |
| Package | 28-pin SPDIP (Skinny Plastic DIP, through-hole) |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Low-Power Technology | nanoWatt XLP (deep-sleep nA range) |
| Programming/Debug | ICSP + ICD (2-wire) |
| Mounting Type | Through-Hole (DIP) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC24F08KL402-I/SP Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (active-low reset) / ICSP programming voltage input |
| Pin 2 | RA0 — PORTA bit 0 (digital I/O, analog AN0) |
| Pin 3 | RA1 — PORTA bit 1 (digital I/O, analog AN1) |
| Pin 4 | RA2 — PORTA bit 2 (digital I/O, analog AN2) |
| Pin 5 | RA3 — PORTA bit 3 (digital I/O, analog AN3, VREF+) |
| Pin 6 | RA4 — PORTA bit 4 (digital I/O, analog AN4, SOSCO) |
| Pin 7 | RA5 — PORTA bit 5 (digital I/O, analog AN5, SOSCI) |
| Pin 8 | RA6 — PORTA bit 6 (digital I/O, analog AN6, OSC1) |
| Pin 9 | RA7 — PORTA bit 7 (digital I/O, analog AN7, OSC2) |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply (1.8 V to 3.6 V) |
| Pin 12 | RB0 — PORTB bit 0 (digital I/O, analog AN8, INT0) |
| Pin 13 | RB1 — PORTB bit 1 (digital I/O, analog AN9, INT1) |
| Pin 14 | RB2 — PORTB bit 2 (digital I/O, analog AN10, INT2) |
| Pin 15 | RB3 — PORTB bit 3 (digital I/O, analog AN11) |
| Pin 16 | RB4 — PORTB bit 4 (digital I/O, SDA1) |
| Pin 17 | RB5 — PORTB bit 5 (digital I/O, SCL1) |
| Pin 18 | RB6 — PORTB bit 6 (digital I/O, PGD/ICSP data) |
| Pin 19 | RB7 — PORTB bit 7 (digital I/O, PGC/ICSP clock) |
| Pin 20 | RB8 — PORTB bit 8 (digital I/O, U1TX) |
| Pin 21 | RB9 — PORTB bit 9 (digital I/O, U1RX) |
| Pin 22 | RB10 — PORTB bit 10 (digital I/O, U2TX) |
| Pin 23 | RB11 — PORTB bit 11 (digital I/O, U2RX) |
| Pin 24 | RB12 — PORTB bit 12 (digital I/O, PWM output) |
| Pin 25 | RB13 — PORTB bit 13 (digital I/O, PWM output) |
| Pin 26 | RB14 — PORTB bit 14 (digital I/O, PWM output) |
| Pin 27 | RB15 — PORTB bit 15 (digital I/O, CCP) |
| Pin 28 | VSS — Ground reference |
Typical Applications
PIC24F08KL402-I/SP is suitable for 6 applications: Low-Power IoT Sensor Nodes, Battery-Powered Consumer Electronics, Small Motor Control (DC / Stepper), Home Appliance User-Interface Panels, USB-to-UART / USB-to-SPI Bridge Dongles, Educational / Hobbyist Prototyping Boards.
Low-Power IoT Sensor Nodes
The PIC24F08KL402-I/SP fits IoT sensor-node designs where nanoWatt XLP deep-sleep currents under 60 nA and 1.8 V to 3.6 V operation extend coin-cell battery life to multi-year ranges. Its 10-bit ADC with up to 12 channels digitizes temperature, humidity, and battery-voltage signals without an external ADC, while the MSSP and UART interfaces connect to radios (LoRa, BLE, Sub-GHz) and debug/programming. The 16 MIPS CPU handles local filtering, threshold detection, and simple protocol stacks. Power-on brown-out and the wide voltage tolerance allow direct LiSOCl2 or 2xAA battery connection without a regulator. The 28-SPDIP package simplifies through-hole prototyping for low-volume sensor products and educational maker kits.
Recommended
Battery-Powered Consumer Electronics
For battery-powered consumer products such as remote controls, wearable bands, and personal-health accessories, the PIC24F08KL402-I/SP combines a sub-microamp sleep mode with enough MIPS to drive simple BLE pairing flows and HMI updates. The 16-bit core executes a capacitive-touch user interface via the ADC and CTMU peripherals, eliminating dedicated touch ICs. The 25 mA source/sink I/O directly drives LEDs, buzzers, and small vibration motors without external transistors. Voltage operation down to 1.8 V suits single-cell Li-ion or alkaline-coin cells, and the 28-SPDIP through-hole package fits legacy consumer product assemblies. The 1 KB SRAM comfortably buffers sensor-acquisition and BLE notification payloads during active cycles.
Recommended
Small Motor Control (DC / Stepper)
The PIC24F08KL402-I/SP is well suited to small brushed-DC and unipolar/bipolar stepper motor control loops using its ECCP and 16-bit timers to generate PWM at up to 32 kHz with hardware dead-band control. Its 16 MIPS CPU runs PID loops in software at loop rates sufficient for small fans, pumps, and appliance motors. The 10-bit ADC samples current-sense shunts and back-EMF for sensorless commutation in BLDC variants (with firmware effort). 2 UARTs enable Modbus RTU or LIN bus connectivity for industrial and appliance integration. The 28-SPDIP package allows hand-reworkable through-hole production for small motor controllers, and the industrial -40 °C to +85 °C range covers appliance and light-industrial environments.
Recommended
Home Appliance User-Interface Panels
For washing machines, microwaves, dishwashers, and air-conditioner control panels, the PIC24F08KL402-I/SP drives multiplexed 7-segment or matrix LED displays, scans capacitive-touch keypads via CTMU, and handles UART/MSSP communication to the main appliance controller. Its 32 MHz operation refreshes displays without flicker and supports 25 I/O for key matrices, LED drivers, and triac interfaces. The MSSP block interfaces with EEPROM or I/O expanders for storing appliance settings and fault logs. Industrial temperature rating (-40 °C to +85 °C) covers kitchen and laundry environments, and nanoWatt XLP keeps standby power below 0.5 W to meet EU and ENERGY STAR regulations. The 28-SPDIP package is ideal for through-hole panel production.
Recommended
USB-to-UART / USB-to-SPI Bridge Dongles
The PIC24F08KL402-I/SP can implement USB-to-UART or USB-to-SPI bridge firmware when paired with an external USB 2.0 full-speed transceiver such as the MCP2200 or MCP2221 (the KL4 lacks native USB). Its 2 UARTs and 1 MSSP handle the asynchronous and synchronous serial endpoints while the 16 MIPS CPU supports USB HID or CDC class enumeration and data pumping at 12 Mbps. The 8 KB Flash fits reference bridge firmware, and the 1 KB SRAM buffers full-speed USB packets comfortably. The 28-SPDIP package supports prototype dongle builds and through-hole production. Industrial temperature range and 1.8 V to 3.6 V operation allow bus-powered or self-powered designs from USB 5 V with simple LDO regulation.
Recommended
Educational / Hobbyist Prototyping Boards
The PIC24F08KL402-I/SP in 28-SPDIP is the preferred through-hole package for breadboard-friendly prototyping, university microcontroller courses, and hobbyist maker projects. Its 0.1 inch pin pitch fits standard solderless breadboards, the ICSP/ICD pins allow direct PICkit 3 or PICkit 4 programming without removing the chip, and the 8 KB Flash holds meaningful firmware samples while remaining teachable. The 25 I/O expose all ports on accessible pins for button/LED experiments, the MSSP enables I²C/SPI sensor tutorials, and the 10-bit ADC supports analog-in labs. Industrial temperature rating and 1.8 V to 3.6 V operation tolerate student wiring mistakes. Documentation and code libraries from Microchip's MPLAB X ecosystem are extensive and free.
Recommended
Recommended Products Summary
Engineering reference data for PIC24F08KL402-I/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24F16KL402-I/SP | PIC24F08KL402-E/SP | PIC24F08KL401-I/SS | PIC24F08KL301-E/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SPDIP | 28-SPDIP | 28-SPDIP | 28-SSOP | 28-SSOP |
| Flash Memory | 8 KB | 16 KB | 8 KB | 8 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| EEPROM | 512 bytes | 512 bytes | 512 bytes | 256 bytes | 0 bytes (no EEPROM) |
| Max CPU Speed | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| ADC | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 12 channels |
Key Differentiators
- Has on-chip 512-byte EEPROM, unlike KL3 sub-family (vs PIC24F08KL301-E/SS)
- Highest EEPROM density in the 28-SPDIP KL4 family (vs PIC24F08KL401-I/SS)
- Drop-in upgrade path to 16 KB Flash in identical 28-SPDIP footprint (vs PIC24F16KL402-I/SP)
Design Notes
The PIC24F08KL402-I/SP operates from 1.8 V to 3.6 V. For battery applications, place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 11) and a 10 µF bulk capacitor at the supply input to handle the inrush currents of GPIO toggling and ADC sampling. When using a switching regulator, add a ferrite bead and a 10 µF + 100 nF Pi-filter to suppress switching noise coupling into the analog AVdd rail. Avoid exceeding 3.6 V at any pin, including ESD transients; for outdoor or industrial installations, add a TVS such as PESD3V3L4UG at the connector entry.
For the 28-SPDIP package, reserve at least 1 mm of copper pour around the VDD pin (pin 11) and the VSS pin (pin 10/28) for thermal dissipation and low-impedance ground. Keep the ICSP/ICD lines (RB6/PGD pin 18, RB7/PGC pin 19) short and free of series resistors when using a PICkit 4 programmer; the 4.7 kΩ pull-up on MCLR (pin 1) must be present for normal operation but does not interfere with ICSP. Analog inputs (RA0-RA7) should be guarded with a ground trace to minimize digital crosstalk from PORTB switching.
A common pitfall is confusing the PIC24F08KL402 (KL4 sub-family, with 512B EEPROM) with the PIC24F08KL302 (KL3 sub-family, no EEPROM). Code that uses the EEPROM peripheral (e.g., EEPROMWrite() / EEPROMRead() calls in the MPLAB XC16 peripheral library) will compile and run on the KL402 but fail silently on the KL302 because the EE registers are absent. Another pitfall is exceeding 16 MIPS code paths - the KL4 core runs most instructions in one cycle, but jumps to the interrupt vector table take 4 cycles, so ISRs must be kept short. Finally, the MCLR pin (pin 1) must NOT be left floating; always tie through a 4.7 kΩ to 10 kΩ pull-up to VDD to prevent spurious resets.
Compliance Information
RoHS compliant per Microchip product page (lead-free finish). Industrial temperature grade only; not AEC-Q100 qualified. For automotive AEC-Q100 qualification, use a different part family such as dsPIC33 or PIC18 K-series. Halogen-free status not explicitly stated in provided data.
