PIC18F24K20T-I/SO - 8-bit 64MHz 16KB Flash MCU | Microchip
MPN: PIC18F24K20T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.21 | $42.10 |
| 100 | $3.74 | $374.00 |
| 500 | $3.31 | $1,655.00 |
| 1,000 | $2.95 | $2,950.00 |
PIC18F24K20T-I/SO Overview
An 8-bit flash microcontroller is a single-chip computer built around an 8-bit data path, on-chip non-volatile program memory (Flash), SRAM for variables, and a rich set of peripherals including timers, ADC, communication ports, and GPIO. The PIC18 architecture is the high-performance family within Microchip's PIC line, providing an enhanced instruction set, C-compiler-friendly orthogonal design, and linear addressing up to 2 MB. The PIC18F24K20 belongs to the PIC18F2XK20/4XK20 family that adds nanoWatt XLP technology and 10-bit ADC for low-power embedded designs.
Key differentiating features include 25 digital I/O pins, 14 channels of 10-bit ADC, two analog comparators, two CCP modules, one Enhanced USART, one MSSP (SPI/I2C), 1024 bytes of data EEPROM, and self-programming Flash with block erase. The 'T' suffix in the MPN indicates tape-and-reel packaging, and 'I' specifies the industrial temperature grade, while /SO denotes the 28-pin SOIC footprint.
Technical depth: the PIC18F24K20 implements Microchip's nanoWatt XLP technology, which delivers standby currents below 100 nA typical and sleep currents as low as 20 nA in the deepest low-power modes. The internal 16 MHz oscillator with 4x PLL provides a 64 MHz system clock, and the architecture allows dynamic clock switching between the primary oscillator, secondary 31 kHz LP oscillator, and the internal oscillator for power optimization. The 10-bit ADC with up to 14 channels supports both single-ended and differential conversions at 100 ksps.
Typical applications include battery-powered sensor nodes, low-energy wireless remotes (sub-GHz or BLE host MCUs), home appliances and white goods, industrial control modules, automotive body electronics (non-safety), and USB device controllers via the MSSP/USART peripherals. The combination of 16 KB Flash and XLP sleep currents allows year-long operation on two AA cells in typical 1% duty-cycle applications.
When designing with this part, allocate at least 1 uF Vdd bulk decoupling and a 100 nF ceramic bypass placed within 5 mm of the IC pins. The MCLR pin must use the recommended 10 kohm pull-up to Vdd. The SOIC-28 footprint is industry-standard and socket-compatible with most PIC18F2XK20/4XK20 family variants, allowing easy migration to larger memory parts like PIC18F25K20 or PIC18F26K20 without PCB rework.
This page synthesizes distributor pricing, drop-in alternatives from Microchip's PIC18 family, and practical design notes that complement the manufacturer datasheet and help engineers make faster pin-compatible sourcing decisions.
Drop-in alternatives for PIC18F24K20T-I/SO — 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 PIC18F24K20T-I/SO (same form factor and footprint) — differing in MSL Level, Package, Timers, ADC, Maximum CPU Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25K20T-I/SO
✅ Drop-In✓ In Stock
$2.42 / Unit
View Datasheet →PIC18F26K20T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K20-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K20-E/SO
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC18F23K20T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K20T-I/SS
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC18F24K20T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Family | PIC18F XLP |
| Program Memory Type | Flash |
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 768 bytes |
| EEPROM Size | 256 bytes |
| Maximum CPU Frequency | 64 MHz |
| Instruction Throughput | 16 MIPS |
| Supply Voltage (VDD) | 1.8 V to 3.6 V (F-series core) |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| I/O Pins | 25 |
| ADC | 10-bit, up to 14 channels |
| Package | 28-pin SOIC (SO) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| Lead-Free / Halogen-Free | Yes (per Microchip packaging) |
| On-Chip Oscillator | Internal 16 MHz with 4x PLL, 31 kHz LP secondary |
| Communication Peripherals | 1x EUSART, 1x MSSP (SPI/I2C) |
| Timers | 3x (Timer0/1/2) |
PIC18F24K20T-I/SO Pin Configuration
| Pin 1 | MCLR/VPP/AN0/RA0 — Master Clear (Reset) input or analog input AN0 / digital I/O RA0 |
| Pin 2 | RA1/AN1 — Digital I/O RA1 / analog input AN1 |
| Pin 3 | RA2/AN2/VREF- — Digital I/O RA2 / analog AN2 / negative voltage reference |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O RA3 / analog AN3 / positive voltage reference |
| Pin 5 | RA4/T0CKI/C1OUT — Digital I/O RA4 / Timer0 clock input / Comparator 1 output |
| Pin 6 | RA5/AN4/SS1/HLVDIN/C2OUT — Digital I/O RA5 / analog AN4 / SSP1 slave select / HLVD input / Comparator 2 output |
| Pin 7 | VSS — Ground reference |
| Pin 8 | OSC1/CLKI/RA7 — External oscillator input / digital I/O RA7 |
| Pin 9 | OSC2/CLKO/RA6 — External oscillator output / digital I/O RA6 |
| Pin 10 | RC0/T1OSO/T1CKI — Digital I/O RC0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — Digital I/O RC1 / Timer1 oscillator input / CCP2 PWM output |
| Pin 12 | RC2/CCP1 — Digital I/O RC2 / CCP1 PWM output |
| Pin 13 | RC3/SCK1/SCL1 — Digital I/O RC3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI1/SDA1 — Digital I/O RC4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO1 — Digital I/O RC5 / SPI data out |
| Pin 16 | RC6/TX1/CK1 — Digital I/O RC6 / EUSART1 transmit / EUSART1 clock |
| Pin 17 | RC7/RX1/DT1 — Digital I/O RC7 / EUSART1 receive / EUSART1 data |
| Pin 18 | VSS — Ground reference |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RB0/AN12/INT0 — Digital I/O RB0 / analog AN12 / external interrupt 0 |
| Pin 21 | RB1/AN10/INT1 — Digital I/O RB1 / analog AN10 / external interrupt 1 |
| Pin 22 | RB2/AN8 — Digital I/O RB2 / analog AN8 |
| Pin 23 | RB3/AN9/CCP2 — Digital I/O RB3 / analog AN9 / alternate CCP2 |
| Pin 24 | RB4/AN11/KBI0 — Digital I/O RB4 / analog AN11 / KBI interrupt 0 |
| Pin 25 | RB5/KBI1 — Digital I/O RB5 / KBI interrupt 1 |
| Pin 26 | RB6/KBI2/PGC — Digital I/O RB6 / KBI interrupt 2 / ICSP clock |
| Pin 27 | RB7/KBI3/PGD — Digital I/O RB7 / KBI interrupt 3 / ICSP data |
| Pin 28 | AVDD — Analog supply voltage |
Typical Applications
PIC18F24K20T-I/SO is suitable for 6 applications: Battery-Powered IoT Sensor Node, Home Appliance Control Board, Industrial Sensor Hub / Modbus Slave, Automotive Body Electronics (Non-Safety), USB-to-UART Bridge Firmware Host, Remote Control / Wireless Beacon Host.
Battery-Powered IoT Sensor Node
The PIC18F24K20T-I/SO is a strong fit for battery-powered IoT sensor nodes because its nanoWatt XLP technology delivers standby currents below 100 nA typical and deep-sleep currents around 20 nA, allowing a CR2032 coin cell to power the node for several years at 1% average duty cycle. With 16 KB of Flash, the device hosts a typical LoRaWAN or BLE-beacon stack plus a sensor-aggregation layer, while the 14-channel 10-bit ADC handles temperature, humidity, and battery-voltage monitoring simultaneously. The 64 MHz CPU burst mode lets the node wake, sample, transmit, and return to sleep in well under 100 ms.
Recommended
Home Appliance Control Board
For white-goods and HVAC control boards, the PIC18F24K20T-I/SO integrates the 10-bit ADC, two analog comparators, and CCP/PWM channels needed to drive TRIAC-gated mains loads or variable-speed motor controls. The 25 GPIO pins handle keypad scanning, seven-segment LED multiplexing, relay drivers, and a UART link to a sub-display board. Industrial temperature grade (-40C to +85C) supports kitchen and garage environments, and the 28-SOIC footprint is robust against hand-solder rework common in service-repair scenarios.
Recommended
Industrial Sensor Hub / Modbus Slave
The PIC18F24K20T-I/SO serves as a low-cost Modbus RTU slave in industrial 4-20 mA sensor hubs and analog-to-bridge converters. The EUSART implements Modbus RTU at 9600-115200 baud with hardware address matching, and the 14-channel ADC multiplexes thermocouple, RTD-bridge, and 4-20 mA inputs. The MSSP peripheral supports I2C/SPI expansion for digital sensor stacks, and the 31 kHz LP oscillator provides a hardware RTC tick for timestamping without CPU intervention. SOIC-28 simplifies field-replacement.
Recommended
Automotive Body Electronics (Non-Safety)
While the PIC18F24K20T-I/SO is industrial-grade and not AEC-Q100 qualified, it is widely used in aftermarket automotive body-electronics such as seat-controller replacement modules, RGB interior-lighting drivers, and auxiliary accessory controllers where safety-critical operation is not required. The 64 MHz CPU executes CAN-bit-banging stacks when a dedicated CAN peripheral is not needed, and the 10-bit ADC reads potentiometers and current-shunt amplifiers for analog feedback loops. Designers needing AEC-Q100 must migrate to PIC18FxxK20-E or automotive-grade siblings.
Recommended
USB-to-UART Bridge Firmware Host
Although the PIC18F24K20T-I/SO lacks native USB, designers use it as the protocol-conversion host MCU paired with an external USB-UART bridge IC such as the MCP2200 or MCP2221. The EUSART handles the asynchronous serial side at up to 115200 baud, while the MCU's 16 KB Flash hosts command-parsing firmware, configuration storage in the 256-byte EEPROM, and LED status indicators on the 25 GPIO pins. This pattern is common in low-cost USB diagnostic tools, sensor-configuration dongles, and field-programming fixtures.
Recommended
Remote Control / Wireless Beacon Host
The PIC18F24K20T-I/SO is a frequent host MCU for sub-GHz remote-control and BLE-beacon designs. Its XLP sleep mode drops quiescent current to ~20 nA, allowing a coin-cell-powered keyfob to sleep until a button-press wakes the part, executes a transmission, and returns to sleep. The 10-bit ADC reads potentiometers and battery-voltage monitors, and the 16 KB Flash hosts encrypted rolling-code firmware. Migration to PIC18F26K20T-I/SO is firmware-only if rolling-code algorithms outgrow 16 KB.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24K20T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25K20T-I/SO | PIC18F26K20T-I/SO | PIC18F24K20-I/SO | PIC18F23K20T-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same |
| Program Memory (Flash) | 16 KB | 32 KB | 64 KB | 16 KB | 8 KB |
| RAM | 768 bytes | 1536 bytes | 3896 bytes | 768 bytes | 512 bytes |
| Maximum Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| I/O Pins | 25 | 25 | 25 | 25 | 25 |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Packaging Form | Tape & Reel | Tape & Reel | Tape & Reel | Tube | Tape & Reel |
Key Differentiators
- Largest Flash density at the same 28-SOIC footprint (vs PIC18F23K20T-I/SO)
- nanoWatt XLP extreme-low-power sleep current (vs PIC18F24J50-I/SO)
- Industry-standard 28-SOIC footprint enables drop-in migration (vs PIC18F24K20T-I/SS)
Design Notes
Estimated: at 64 MHz CPU clock with all peripherals active, the PIC18F24K20T-I/SO consumes approximately 9 mA from a 3.3V supply. Sleep current with WDT disabled drops to ~20 nA in nanoWatt XLP deepest sleep mode. Place a 10 uF bulk capacitor and 100 nF ceramic bypass within 5 mm of the VDD pin to handle CPU current spikes during Flash writes, which can peak at 50 mA for a few milliseconds.
The 28-SOIC footprint has a 1.27 mm pitch and 7.5 mm body width - verify land pattern against IPC-7351 nominal SOIC-28. The exposed bottom of the SOIC body is a thermal pad tie point; ground it to a small copper pour for thermal dissipation during 64 MHz operation. Keep switching traces away from the AVDD pin to prevent digital noise injection into the ADC reference.
Always pull MCLR (pin 1) to VDD through a 10 kohm resistor - leaving it floating causes unreliable resets under EMI. ICSP programming on PGC/PGD (pins 26/27) requires 4.7 kohm pull-down on PGD and 4.7 kohm pull-up on PGC per Microchip debugger documentation. Configure CONFIG words to enable the internal 16 MHz oscillator with 4x PLL, otherwise the device latches at 1 MHz on first power-up with no clock source.
The ADC on AN0-AN11 shares its sample-and-hold with digital I/O on the same port - switching adjacent digital pins during a conversion can couple noise into the ADC result. Acquire samples with the CPU in SLEEP mode or use the ADC in differential mode for best noise rejection. The 10-bit ADC delivers 100 ksps throughput at 64 MHz CPU clock.
Compliance Information
RoHS and lead-free compliant per Microchip packaging specification. NOT AEC-Q100 qualified - industrial grade only. For automotive body-electronics in safety-relevant circuits, choose PIC18F24K20-E/SO (extended temperature) or PIC18FxxK20 AEC-Q100 siblings.
