PIC18F24K20-I/SS - 8-bit 64MHz MCU 16KB Flash XLP | Microchip
MPN: PIC18F24K20-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.92 | $1,920.00 |
PIC18F24K20-I/SS Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, non-volatile flash memory, RAM, EEPROM, peripherals (ADC, timers, UART, I/O), and a clock source. The PIC18 family uses an enhanced Harvard RISC architecture with 16-bit instructions, C-compiler-optimized instruction set, and optional extended instruction set for re-entrant code. Within the broader semiconductor hierarchy, PIC18 MCUs sit under the umbrella of microcontrollers, then embedded controllers, then integrated circuits. The "K" suffix denotes the K-series that adds 64MHz operation and the nanoWatt XLP power-saving feature set.
Key features of the PIC18F24K20-I/SS include: 16KB flash program memory with linear addressing up to 64K bytes, 768 bytes RAM, 256 bytes data EEPROM, 25 I/O ports, an integrated 10-bit ADC, multiple timers, MSSP (SPI/I2C) and enhanced USART peripherals, and a self-programmable flash architecture that supports bootloader-based field updates. The nanoWatt XLP feature delivers sleep currents in the nanoamp range, making the device well suited to battery-backed applications.
Typical applications include industrial sensor interfaces, low-power remote controls, consumer appliances, USB-to-UART bridges, battery monitoring, automotive body modules, and small home-automation nodes. The 25 available I/O and the SSOP-28 footprint enable compact PCB designs with sufficient headroom for LED drivers, keypads, or sensor clusters. The integrated 10-bit ADC handles thermistor, potentiometer, and low-speed voltage sampling without an external converter.
When designing with this part, plan for at least one decoupling capacitor per power pin, place the ICSP programming header for in-circuit serial programming access, and budget flash endurance at 10K erase/write cycles minimum. The 64MHz operation at 5V provides 16 MIPS throughput, but designers must respect VDD-VPP relationships during flash programming.
Drop-in alternatives for PIC18F24K20-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 PIC18F24K20-I/SS (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Timers, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25K20-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K20T-I/SS
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC18F24K20-E/SS
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →PIC18F23K20-I/SS
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →PIC18F24K22-I/SS
✅ Drop-In✓ In Stock
$1.32 / Unit
View Datasheet →PIC18F24K20-I/SS Maximum Ratings & Electrical Characteristics
| Family | PIC18F2XK20/4XK20 |
| Core | 8-bit PIC RISC |
| CPU Clock Speed | 64 MHz |
| MIPS (max) | 16 MIPS |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 768 bytes |
| Data EEPROM | 256 bytes |
| I/O Ports | 25 |
| ADC | 10-bit |
| Supply Voltage | 1.8 V to 5.5 V (varies by F/L variant) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 28-pin SSOP (5.30 mm body) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
| Low-Power Technology | nanoWalt XLP |
| Peripherals | MSSP (SPI/I2C), Enhanced USART, Timers, PWM, 10-bit ADC |
PIC18F24K20-I/SS Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, programming voltage input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 10 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / USART async transmit / sync clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / USART async receive / sync data |
| Pin 19 | VSS — Ground reference (second VSS) |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0/INT0/AN12 — PORTB bit 0 / External interrupt 0 / Analog input 12 |
| Pin 22 | RB1/INT1/AN10 — PORTB bit 1 / External interrupt 1 / Analog input 10 |
| Pin 23 | RB2/INT2/AN8 — PORTB bit 2 / External interrupt 2 / Analog input 8 |
| Pin 24 | RB3/AN9/CCP2 — PORTB bit 3 / Analog input 9 / CCP2 output |
| Pin 25 | RB4/AN11 — PORTB bit 4 / Analog input 11 |
| Pin 26 | RB5/AN13 — PORTB bit 5 / Analog input 13 |
| Pin 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 28 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC18F24K20-I/SS is suitable for 6 applications: Industrial Sensor Interface Node, Battery-Powered Remote Control, Consumer Appliance Control Board, USB-to-UART Bridge Dongle, Automotive Body Control Module, Smart Home Sensor Hub.
Industrial Sensor Interface Node
The PIC18F24K20-I/SS fits industrial sensor-interface nodes because its 64 MHz / 16 MIPS core handles Modbus RTU packet processing over the enhanced USART, while the 10-bit ADC reads multiple analog sensors with the internal voltage reference. The nanoWatt XLP sleep mode drops current to nanoamp levels between sensor reads, so a 3.3V coin cell can power a wireless sensor node for years. Twenty-five I/O pins support keypads, status LEDs, and multiple SPI sensors without external logic.
Recommended
Battery-Powered Remote Control
In battery-powered remote controls, the PIC18F24K20-I/SS leverages its nanoWatt XLP technology to enter sleep modes with sub-microamp current draw between user button presses. The 16 KB flash accommodates complex IR/RF protocol stacks (RC5, NEC, custom proprietary), and the MSSP peripheral generates SPI or I2C control signals for companion radios. At 1.8 V minimum supply, the device operates directly from a single alkaline or lithium coin cell, while the industrial -40C to +85C range suits outdoor use.
Recommended
Consumer Appliance Control Board
The PIC18F24K20-I/SS anchors consumer appliance control boards where cost, reliability, and peripheral integration matter. Its 16 KB flash stores appliance state machines and user interface logic, while the enhanced PWM drives triac-controlled AC loads (heaters, valves, motors). The 10-bit ADC samples NTC thermistors for closed-loop temperature control, and the 25 I/O connect directly to LED indicators, keypads, and buzzer drivers without external logic.
Recommended
USB-to-UART Bridge Dongle
For USB-to-UART bridge dongles, the PIC18F24K20-I/SS uses its enhanced USART for asynchronous serial communication and the MSSP peripheral for SPI pass-through to target devices. The 16 KB flash implements USB HID or CDC class stacks, while 768 bytes RAM supports buffer management. The SSOP-28 package fits in compact dongle form factors, and the industrial temperature rating ensures operation across diverse deployment environments.
Recommended
Automotive Body Control Module
The PIC18F24K20-I/SS (or the automotive-grade AEC-Q100 PIC18F24K20-I/SS equivalent) serves in automotive body control modules for window lifters, mirror adjusters, and interior lighting. Its 16 KB flash stores diagnostic routines and CAN-friendly protocol layers, the enhanced PWM drives motor H-bridges, and the 25 I/O accommodate multiple switch inputs and relay drivers. The wide -40C to +85C operating temperature suits under-dash and door-mounted installations.
Recommended
Smart Home Sensor Hub
In smart-home sensor hubs, the PIC18F24K20-I/SS coordinates Z-Wave, Zigbee, or LoRa transceivers through its SPI/I2C MSSP peripheral, while the enhanced USART logs events to a Wi-Fi co-processor. The 16 KB flash supports application logic for occupancy sensing, light-level adaptation, and tamper detection. nanoWatt XLP sleep modes let battery-powered door/window sensors run multi-year deployments, and 25 I/O integrate reed switches, PIR sensors, and indicator LEDs.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24K20-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25K20-I/SS | PIC18F24K20T-I/SS | PIC18F24K20-E/SS | PIC18F23K20-I/SS | PIC18F24K22-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin SSOP | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same |
| Flash Memory | 16 KB | 32 KB (+100%) | 16 KB (same) | 16 KB (same) | 8 KB (-50%) | 16 KB (same) |
| RAM | 768 bytes | 1536 bytes | 768 bytes | 768 bytes | 512 bytes | 768 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Max CPU Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C |
| I/O Pins | 25 | 25 | 25 | 25 | 25 | 25 |
| Low-Power Tech | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP |
Key Differentiators
- Highest flash density within the K20 28-pin SSOP option set (vs PIC18F23K20-I/SS)
- Industrial temperature range standard vs extended-only alternatives (vs PIC18F24K20-E/SS)
- Drop-in same-family upgrade path with double flash available (vs PIC18F25K20-I/SS)
Design Notes
Estimated: at fOSC = 64 MHz, VDD = 5.0 V and all peripherals active, typical IDD is approximately 15 mA per the PIC18F2XK20/4XK20 datasheet 41303E. For battery applications, switch to the LF variant or use the nanoWatt XLP sleep modes to drop quiescent current to the nanoamp range. Always place a 100 nF decoupling capacitor as close as possible to each VDD pin (pin 20) and a bulk 10 uF capacitor on the supply rail to suppress digital switching noise.
Route the ICSP signals (RB6/PGC pin 27 and RB7/PGD pin 28) directly to a 6-pin header placed at the board edge with no series resistors in-line during programming. Use a 10 kohm pull-up on MCLR (pin 1) to VDD; a 100 nF capacitor from MCLR to VSS provides noise immunity. Keep the 28-pin SSOP footprint on a 1.0 mm pitch with 0.65 mm lead width to comply with the JEDEC MS-026 land pattern. Maintain a continuous ground plane under the device to minimize EMI coupling.
Do not exceed the absolute maximum VDD of 7.0 V or current per pin of 25 mA per Microchip datasheet 41303E. Configure unused I/O as outputs driven low rather than inputs to prevent floating-pin current spikes. When using the ADC, ensure the A/D acquisition time exceeds 1.4 us and add a 100 ohm series resistor with a 100 nF capacitor on analog inputs to limit sample-charge injection. Always clear the GIE bit before modifying interrupt-flag registers to avoid race conditions in ISR-driven firmware.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade (-40C to +85C) only; for AEC-Q100 automotive qualification, consult Microchip factory for the dedicated automotive part variant. REACH SVHC compliance confirmed; no declarable substances above 0.1% weight threshold.
