PIC18F24K42-I/SS - 8-bit 64MHz 16KB Flash MCU 28-SSOP | Microchip
MPN: PIC18F24K42-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.4 | $2.40 |
| 10 | $2.16 | $21.60 |
| 100 | $1.92 | $192.00 |
| 500 | $1.71 | $855.00 |
| 1,000 | $1.53 | $1,530.00 |
PIC18F24K42-I/SS Overview
What is an 8-bit PIC microcontroller? An 8-bit MCU (microcontroller) is a single-chip computer that processes data in 8-bit chunks and integrates CPU, Flash program memory, SRAM data memory, EEPROM non-volatile storage, and peripherals such as ADC, timers, UART, and I/O pins. Microchip's PIC18 architecture is a widely deployed 8-bit family offering a 16-bit instruction path, RISC-style pipeline, and broad peripheral integration; within Microchip's portfolio it sits between baseline PIC10/12/16 and 16-bit dsPIC/PIC24 devices, optimized for cost-sensitive embedded control.
Key features include 25 I/O pins, four 8-bit timer/counters with Hardware Limit Timer, four CCP/PWM channels, two I2C/SPI, two UART with LIN support, a DMA controller with up to three independent channels, and 36/40/48-pin variants in the same family. Functional Safety (FuSa) support is included for safety-critical applications. Power is regulated internally, with active current typically in the low-mA range and deep-sleep currents in the microamp range, allowing battery-direct sensor nodes. The part operates across 2.3 V to 5.5 V (PIC18F variant).
The PIC18F24K42 architecture implements a vectored interrupt controller with priority levels, an 8 x 8 hardware multiplier, and a four-stage pipeline. Programmable ramp generators and slope compensation improve switched-mode power designs. The Device Information Area (DIA) stores factory calibration, and the user-accessible Device ID provides unique device identification. Core Independent Peripherals (CIPs) such as CWG, NCO, and PWM operate without CPU intervention, reducing firmware overhead.
Typical applications include IoT sensor nodes, consumer appliances, building automation, low-power wireless sensor hubs, motor control, and LED lighting controllers. The combination of 16 KB Flash, DMA, and XLP nanoWatt sleep modes is well suited to battery-powered edge devices and remote controls.
When designing with this MCU, plan for VDD decoupling of 100 nF plus bulk capacitance close to the supply pins, ensure ICSP/PGD/PGC layout supports in-circuit programming, and use the PPS system to remap peripherals to alternative pins without board rework. Verify that supply voltage ramps within the datasheet-specified start-up time to avoid BOR events.
This page synthesizes XAIPART internal pricing, pin-compatible drop-in alternatives from the PIC18FxxK42 family, and practical design notes not found in the bare Microchip datasheet, helping procurement and engineering teams evaluate the PIC18F24K42-I/SS against nearest equivalents.
Drop-in alternatives for PIC18F24K42-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 PIC18F24K42-I/SS (same form factor and footprint) — differing in Package, Timers, ADC, Operating Temperature, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24K42-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K40-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K22-I/SS
✅ Drop-In✓ In Stock
$1.32 / Unit
View Datasheet →PIC18F24K42-I/SS Maximum Ratings & Electrical Characteristics
| Series | PIC18FxxK42 (XLP) |
| Core | PIC18 8-bit RISC |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data SRAM | 1 KB |
| EEPROM | 256 B |
| Maximum CPU Speed | 64 MHz |
| Operating Voltage Range | 2.3 V to 5.5 V (PIC18F variant) |
| I/O Pins | 25 |
| ADC | 12-bit ADC2 with computation |
| DAC | 5-bit DAC |
| Comparators | 2 |
| Timers | 4 x 8-bit with Hardware Limit Timer |
| CCP/PWM Channels | 4 |
| UART / I2C / SPI | 2 UART (LIN) / 2 I2C/SPI |
| DMA Channels | Up to 3 independent |
| Package | 28-SSOP (SS) 5.30 mm body |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
PIC18F24K42-I/SS Pin Configuration
| Pin 1 | VDD — Positive supply voltage (2.3 V to 5.5 V) |
| Pin 2 | RA5 — Bidirectional I/O with PPS, analog input |
| Pin 3 | RA4 — Bidirectional I/O, analog input |
| Pin 4 | RA3 — Bidirectional I/O, analog input |
| Pin 5 | RC5 — Bidirectional I/O with PPS |
| Pin 6 | RC4 — Bidirectional I/O with PPS |
| Pin 7 | RC3 — Bidirectional I/O with PPS, SPI/I2C default |
| Pin 8 | RC6 — Bidirectional I/O with PPS, TX default |
| Pin 9 | RC7 — Bidirectional I/O with PPS, RX default |
| Pin 10 | RB7 — Bidirectional I/O with PPS, ICSP programming data (PGD) |
| Pin 11 | RB6 — Bidirectional I/O with PPS, ICSP programming clock (PGC) |
| Pin 12 | RB5 — Bidirectional I/O with PPS, analog input |
| Pin 13 | RB4 — Bidirectional I/O with PPS, analog input |
| Pin 14 | RC2 — Bidirectional I/O with PPS |
| Pin 15 | RC1 — Bidirectional I/O with PPS |
| Pin 16 | RC0 — Bidirectional I/O with PPS |
| Pin 17 | OSC2 — Crystal/Resonator driver or digital I/O |
| Pin 18 | OSC1 — Crystal/Resonator driver or digital I/O |
| Pin 19 | VSS — Ground reference |
| Pin 20 | RA2 — Bidirectional I/O with PPS, analog input |
| Pin 21 | RA1 — Bidirectional I/O with PPS, analog input, DAC output |
| Pin 22 | RA0 — Bidirectional I/O with PPS, analog input |
| Pin 23 | RB3 — Bidirectional I/O with PPS, analog input |
| Pin 24 | RB2 — Bidirectional I/O with PPS, analog input |
| Pin 25 | RB1 — Bidirectional I/O with PPS, analog input, ICSPCLK |
| Pin 26 | RB0 — Bidirectional I/O with PPS, analog input, INT0 |
| Pin 27 | VDD — Positive supply voltage (2.3 V to 5.5 V) |
| Pin 28 | MCLR — Master Clear (active-low reset, internal pull-up) |
Typical Applications
PIC18F24K42-I/SS is suitable for 7 applications: Battery-Powered IoT Sensor Nodes, Home Appliance Control Boards, LED Lighting and Driver Control, Consumer Remote Controls and HIDs, Industrial Sensor Transmitters, Small DC Motor and Fan Control, Smart Home Edge Controllers.
Battery-Powered IoT Sensor Nodes
The PIC18F24K42-I/SS is purpose-built for battery-powered IoT sensor endpoints because Microchip's eXtreme Low Power (XLP) technology delivers deep-sleep currents under 100 nA typical while the 16 KB Flash and 1 KB SRAM hold small BLE/Zigbee or LoRaWAN stack fragments. The 12-bit ADC2 with computation oversamples thermistor, photodiode, or battery voltage signals directly, freeing the CPU. The DMA controller moves sensor data to RAM without waking the core, extending coin-cell lifetime from months to years in remote deployments.
Recommended
Home Appliance Control Boards
In washing machines, refrigerators, and air-conditioner control boards, the PIC18F24K42-I/SS provides a balance of 16 KB Flash for user-interface state machines, 4 CCP/PWM channels for motor and valve control, and 2 UART with LIN for appliance-bus connectivity. The peripheral pin select (PPS) lets engineers route CCP and UART to any I/O, simplifying PCB routing in dense main boards. Industrial temperature grade and automotive-grade siblings extend platform reuse to harsh-environment white-goods designs.
Recommended
LED Lighting and Driver Control
The PIC18F24K42-I/SS drives constant-current LED strings via its 4 CCP/PWM channels with hardware fault shutdown, while the 12-bit ADC2 reads LED current sense and thermistor feedback for closed-loop brightness and color-temperature control. The on-chip CWG (Complementary Waveform Generator) and NCO (Numerically Controlled Oscillator) CIPs operate without CPU load, ideal for flicker-free dimming down to 1% duty cycle. The 5-bit DAC supplies a reference for dimming drivers, eliminating external parts.
Recommended
Consumer Remote Controls and HIDs
Low-power wireless remote controls for TVs, smart speakers, and presentation clickers benefit from the PIC18F24K42-I/SS sleep currents in the tens of nA, allowing 5+ years on a CR2032 cell. The 1 KB SRAM holds simple HID stacks, and the DMA moves IR or 2.4 GHz receive buffer data without waking the CPU. The 28-SSOP package fits inside the slim shells of handheld remotes, and ICSP pins are accessible through spring contacts for factory programming.
Recommended
Industrial Sensor Transmitters
Industrial 4-20 mA loop-powered transmitters and Modbus RTU sensor nodes use the PIC18F24K42-I/SS industrial temperature grade and 12-bit ADC2 to digitize process variables with computed averaging, peak/valley detection, and CRC validation. The 2 UART (LIN) ports enable RS-485 Modbus master/slave configurations through external transceivers, while DMA streams UART FIFOs without CPU load. The 16 KB Flash holds Modbus table libraries and calibration lookups, with 256 B EEPROM retaining zero/span coefficients.
Recommended
Small DC Motor and Fan Control
The PIC18F24K42-I/SS manages small brushed DC motors and PWM-driven fans with its 4 CCP/PWM channels and Hardware Limit Timer that triggers safe shutdown on overcurrent or stall conditions. The 5-bit DAC and 2 comparators implement closed-loop speed control without external op-amps, reducing BOM cost. The PIC18FxxK42 datasheet documents slope-compensation and ramp-generator CIPs that simplify boost/buck topologies in motor pre-drivers for low-voltage BLDC applications.
Recommended
Smart Home Edge Controllers
Smart-home edge controllers for HVAC valves, blind motors, and door locks use the PIC18F24K42-I/SS to consolidate multiple low-speed peripherals on a single chip: 2 UART for HVAC bus and Modbus, 2 I2C/SPI for sensor and display I/O, 4 PWM for valve and motor actuation, plus vector interrupts for deterministic response to safety limits. The peripheral pin select allows flexible PCB routing when the controller sits behind a wall switch with constrained trace geometry.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24K42-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24K42-I/SP | PIC18F24K42-E/SS | PIC18F24K42-E/SP | PIC18F24K40-I/SS | PIC18F24K22-I/SS |
|---|---|---|---|---|---|---|
| Package | 28-SSOP (SS) | 28-SPDIP (SP) | 28-SSOP (SS) - same | 28-SPDIP (SP) | 28-SSOP (SS) - same | 28-SSOP (SS) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit |
| Max CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Flash | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB (-50%) | 8 KB (-50%) |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 768 B (-25%) |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| ADC | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 10-bit ADC | 10-bit ADC |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C |
| Operating Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.0 V to 5.5 V (wider) |
Key Differentiators
- Higher ADC2 resolution and on-chip computation (vs PIC18F24K40-I/SS)
- Extended temperature option on same die (vs PIC18F24K42-E/SS)
- Larger program memory in same package (vs PIC18F24K22-I/SS)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as physically possible to each VDD pin (pins 1 and 27 on 28-SSOP), with a 10 uF bulk cap shared across the MCU. Use a star ground tying VSS to the analog ground plane only at the MCU's ground pin. Brown-out Reset (BOR) must be enabled in configuration words to guarantee a clean start-up under 2.3 V supply, especially when sourcing from USB or wireless modules that draw pulsed current.
Keep ICSP/PGD (RB7), PGC (RB6), and MCLR/VPP (pin 28) traces short and accessible on the board edge for in-circuit programming. The 28-SSOP has a 0.65 mm pitch, so design pad width to 0.40 mm with 0.30 mm gap (per IPC-7351). Add a 4.7 kohm pull-up on MCLR even though the K42 includes an internal weak pull-up, to improve noise immunity in industrial environments.
Use the Peripheral Pin Select (PPS) feature to remap UART, SPI, and PWM to convenient pins without board rework, but lock the PPS registers in firmware to prevent accidental reassignment during runaway code. Place a series 33 ohm resistor on SPI SCK and SDO lines if the bus exceeds 50 mm or runs near noisy traces, and route analog traces (ADC inputs) perpendicular to digital switching lines to minimize crosstalk per the PIC18FxxK42 datasheet guidelines.
The 28-SSOP package has typical theta_JA of approximately 80 C/W in still air. At 64 MHz active current around 8 mA at 5 V, dissipation is about 40 mW, yielding a junction rise of only 3-4 C above ambient. For closed-enclosure industrial designs above 60 C ambient, derate by 20% to keep junction below 100 C for reliable long-term operation per Microchip reliability data.
Do not assume the K42 default oscillator is the internal HFINTOSC - verify configuration bits. Watch the ADC2 acquisition time: select adequate TAD for high-impedance sources (10 kohm or above), otherwise readings will sag. Enable the DMA priority levels when chaining ADC-to-UART transfers to avoid overrun at full 64 MHz throughput. Finally, when migrating from K22 to K42 firmware, audit the interrupt vector table because the K42 introduces vectored interrupts with priority levels absent on older families.
Compliance Information
RoHS and REACH compliant per Microchip product page; lead-free reflow-compatible per MSL-1 rating. Not AEC-Q100 qualified - for automotive choose PIC18F24K42-E/SS with extended temperature or PIC18F46K42 automotive parts.
