PIC18F24K42T-I/SS - 8-bit 64MHz 16KB Flash MCU SSOP-28 | Microchip
MPN: PIC18F24K42T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.34 | $2.34 |
| 10 | $2.1 | $21.00 |
| 100 | $1.86 | $186.00 |
| 500 | $1.65 | $825.00 |
| 1,000 | $1.47 | $1,470.00 |
PIC18F24K42T-I/SS Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path CPU. It sits in the broader hierarchy of microcontroller -> embedded processor -> semiconductor and is typically used as the central controller in cost-sensitive, low-power, deterministic embedded systems where raw computational throughput is less critical than peripheral integration, low quiescent current, and deterministic interrupt response.
Key features of the PIC18F24K42 include a 12-bit ADC2 with computation, a 5-bit DAC, multiple comparators, and zero-crossing detection. The 64 MHz internal oscillator allows the device to operate without an external crystal in many applications. The 16 KB self-programmable Flash supports in-application updates, and 256 bytes of EEPROM are available for non-volatile data storage independent of program Flash. The device also offers multiple serial interfaces including UART, SPI, and I2C, making it suitable for sensor hubs, motor control, and human-machine interface (HMI) designs.
Architecturally, the PIC18F24K42 uses an enhanced mid-range 8-bit core with a hardware multiply and a 16-bit instruction path, achieving throughput of 16 MIPS at 64 MHz. The CIP (Core Independent Peripherals) ecosystem - CLC, CWG, NCO, PWM, and DMA - allows complex timing, signal generation, and event-driven tasks to run without CPU intervention, which significantly reduces firmware complexity and active CPU time.
Typical applications include IoT sensor nodes, low-power battery-powered instrumentation, automotive body and lighting modules, motor control for fans and small appliances, LED lighting controllers, and consumer HMI panels. Industrial use cases include building automation, HVAC controllers, and remote-control units. The wide operating voltage range of 1.8 V to 5.5 V with industrial -40C to +85C temperature support enables operation directly from a single-cell Li-ion battery or a regulated 3.3 V/5 V rail.
When designing with this device, allocate the SSOP-28 PCB footprint and provide a robust decoupling network of a 100 nF ceramic near VDD plus a bulk capacitor at the supply rail. Carefully plan pin assignments for analog and digital functions, as the analog pins multiplex with digital I/O. Always verify Vector Interrupt Table behavior in MPLAB X IDE before porting code between PIC18FxxK42 and older PIC18FxxK22 devices, as the IVT layout differs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Engineers searching for a compact 8-bit MCU with rich CIP peripherals will find the PIC18F24K42T-I/SS particularly well-suited to battery-powered and functional-safety designs.
Drop-in alternatives for PIC18F24K42T-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 PIC18F24K42T-I/SS (same form factor and footprint) — differing in Package, ADC, Comparators, Operating Temperature, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24K42-I/SS
✅ Drop-In✓ In Stock
$1.53 / Unit
View Datasheet →PIC18F24K42-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K40T-I/SS
✅ Drop-In✓ In Stock
$1.1 / Unit
View Datasheet →PIC18F24K42-I/SP
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →PIC18F24K42-E/SP
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC18F24K42T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit |
| Family | PIC18FxxK42 (XLP, FuSa) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| SRAM | 1 KB |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 64 MHz |
| Throughput | 16 MIPS |
| Operating Voltage | 1.8 V to 5.5 V |
| Package | 28-pin SSOP |
| Mounting Type | Surface Mount |
| ADC | 12-bit ADC2 with computation |
| DAC | 5-bit DAC |
| Operating Temperature | -40C to +85C (Industrial) |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
PIC18F24K42T-I/SS Pin Configuration
| Pin 1 | RA0 — Port A bit 0 / analog input |
| Pin 2 | RA1 — Port A bit 1 / analog input |
| Pin 3 | RA2 — Port A bit 2 / analog input |
| Pin 4 | RA3 — Port A bit 3 / analog input |
| Pin 5 | RA4 — Port A bit 4 / analog input |
| Pin 6 | RA5 — Port A bit 5 / analog input |
| Pin 7 | VSS — Ground reference |
| Pin 8 | VDD — Positive supply voltage |
| Pin 9 | RA7 — Port A bit 7 / oscillator |
| Pin 10 | RA6 — Port A bit 6 / oscillator |
| Pin 11 | RC0 — Port C bit 0 / analog input |
| Pin 12 | RC1 — Port C bit 1 / analog input |
| Pin 13 | RC2 — Port C bit 2 / analog input |
| Pin 14 | RC3 — Port C bit 3 / analog / SCL |
| Pin 15 | RC4 — Port C bit 4 / SDA |
| Pin 16 | RC5 — Port C bit 5 / analog input |
| Pin 17 | RC6 — Port C bit 6 / TX |
| Pin 18 | RC7 — Port C bit 7 / RX |
| Pin 19 | VSS — Ground reference (secondary) |
| Pin 20 | VDD — Positive supply voltage (secondary) |
| Pin 21 | RB7 — Port B bit 7 / PGEC (ICSP clock) |
| Pin 22 | RB6 — Port B bit 6 / PGED (ICSP data) |
| Pin 23 | RB5 — Port B bit 5 / analog input |
| Pin 24 | RB4 — Port B bit 4 / analog input |
| Pin 25 | RB3 — Port B bit 3 / analog input |
| Pin 26 | RB2 — Port B bit 2 / analog input |
| Pin 27 | RB1 — Port B bit 1 / analog input |
| Pin 28 | RB0 — Port B bit 0 / analog input |
Typical Applications
PIC18F24K42T-I/SS is suitable for 6 applications: IoT Sensor Node Controller, Automotive Body and Lighting Modules, Brushless DC Motor and Fan Control, LED Lighting and Dimming Controllers, Industrial HMI and Keypad Panels, Battery Charging and Power Management Controllers.
IoT Sensor Node Controller
The PIC18F24K42T-I/SS fits IoT sensor nodes because its XLP architecture supports sub-uA sleep currents and 1.8 V to 5.5 V operation from a single Li-ion cell. The 12-bit ADC2 with computation enables direct sensor digitization while DMA offloads buffer fills, letting the CPU sleep. The device wakes on interrupt from CLC-configured sensor thresholds. Field example: a wireless temperature/humidity node running 10-second wake cycles achieves years of battery life, with UART/SPI for radio module link and EEPROM storing calibration data.
Recommended
Automotive Body and Lighting Modules
The PIC18F24K42T-I/SS serves automotive body controllers (BCM) and lighting modules because of its FuSa (Functional Safety) features including MAP, DIA, and vector interrupts that support fault detection. The CWG (Complementary Waveform Generator) drives half-bridges for LED matrix and motor control with hardware dead-band. According to Microchip automotive literature, the SSOP-28 footprint suits space-constrained PCBAs. Operating from 12 V with LDO pre-regulation and -40C to +85C range supports under-hood and cabin deployment.
Recommended
Brushless DC Motor and Fan Control
The PIC18F24K42T-I/SS fits BLDC fan and small-motor control because it integrates a 64 MHz core, CWG peripheral for three-phase complementary PWM with hardware dead-band, and 12-bit ADC2 for back-EMF sensing. The NCO and CLC peripherals enable sensorless zero-crossing detection without CPU intervention. According to Microchip application notes, this device can run sensored or sensorless BLDC at switching frequencies up to 100 kHz. The 16 KB Flash holds state-machine firmware with room for parameter storage in 256-byte EEPROM.
Recommended
LED Lighting and Dimming Controllers
The PIC18F24K42T-I/SS suits commercial and architectural LED drivers because of its CWG, multiple PWM outputs, and 12-bit ADC2 for accurate current sensing. The 5-bit DAC and comparator support closed-loop constant-current regulation across dimming ranges. Operating from 1.8 V to 5.5 V makes it compatible with both 3.3 V logic-level LEDs and 5 V analog reference designs. According to the Microchip PIC18FxxK42 datasheet, the SSOP-28 footprint supports small-form-factor LED driver PCBs.
Recommended
Industrial HMI and Keypad Panels
The PIC18F24K42T-I/SS handles HMI panels because it integrates enough Flash (16 KB) for menu firmware plus 256 bytes of EEPROM for parameter retention. The 12-bit ADC2 reads analog keypad matrices while CLC implements hardware debouncing without CPU cycles. Vector interrupts and DMA allow low-latency response to keypad, encoder, and display refresh. According to Microchip industrial literature, the SSOP-28 footprint fits behind 7-segment or small TFT panels, and the -40C to +85C range covers factory-floor conditions.
Recommended
Battery Charging and Power Management Controllers
The PIC18F24K42T-I/SS manages battery charging because it combines a 12-bit ADC2 for voltage/current sensing, 5-bit DAC for set-point generation, and DMA to stream ADC samples without CPU load. The CWG peripheral can generate PWM-controlled charging profiles and the comparator enables over-current protection. Operating from 1.8 V to 5.5 V supports single-cell Li-ion up to multi-cell NiMH stacks. According to Microchip application notes, the XLP family's sub-uA sleep helps idle-mode efficiency for always-on chargers.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24K42T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24K42-I/SS | PIC18F24K42-E/SS | PIC18F24K40T-I/SS | PIC18F24K42-I/SP | PIC18F24K42-E/SP |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-28 | SSOP-28 (same) | SSOP-28 (same) | SSOP-28 (same) | SPDIP-28 (through-hole, same pin assignments) | SPDIP-28 (through-hole, same pin assignments) |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| ADC Resolution | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 10-bit ADC | 12-bit ADC2 | 12-bit ADC2 |
| Functional Safety (FuSa) | Yes (MAP, DIA) | Yes | Yes | No | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +125C |
| Approximate Unit Price (qty 1000) | $1.47 | ~$1.45 | ~$1.85 | ~$1.30 | ~$1.55 | ~$1.95 |
Key Differentiators
- Functional Safety (FuSa) features integrated for safety-critical designs (vs PIC18F24K40T-I/SS)
- 12-bit ADC2 with computation for accurate sensor digitization (vs PIC18F24K22T-I/SS)
- Rich Core Independent Peripherals (CIP) ecosystem (vs PIC18F24K20T-I/SS)
Design Notes
Decoupling: Place a 100 nF X7R ceramic capacitor as close as possible to each VDD pin (pins 8 and 20 on SSOP-28). Add a bulk 4.7 uF to 10 uF tantalum or ceramic capacitor at the supply rail. According to the Microchip PIC18FxxK42 datasheet, VDD rise time must be monotonic and must complete within 50 ms to avoid POR issues. Place a ferrite bead or 10 ohm resistor in series with the analog AVDD supply if used, to isolate digital switching noise from analog references.
PCB layout: The SSOP-28 has a 0.65 mm pitch requiring careful trace routing. Keep traces under the chip body short to avoid signal integrity issues with high-speed oscillator pins (RA6/RA7). Ground plane should be continuous under the MCU. Place a guard ring around analog pins (RA0-RA5, RB0-RB5, RC0-RC5) to improve ADC noise performance. The ICSP pins RB6 (PGED) and RB7 (PGEC) must be accessible in production - do not route them to connectors that block programming.
Watch out for IVT differences: The PIC18FxxK42 family has a different Interrupt Vector Table layout compared to PIC18FxxK22 and earlier PIC18F devices. Firmware compiled for K22 must be recompiled for K42. Also, the ADC2 module on K42 has different channel mapping and configuration registers vs the legacy ADC on K22. According to Microchip porting guides, always verify the Configuration Words (CONFIG1-CONFIG7) and peripheral initialization code when migrating between PIC18 families.
Thermal: The SSOP-28 has thermal resistance theta_JA of approximately 95 C/W on a standard 2-layer JEDEC test board. At maximum operating current consumption of about 12 mA active / sub-uA sleep, self-heating is minimal (<0.1 W). However, in motor-control applications where the MCU drives high-current FETs through the SSOP pin outputs, verify that the device remains within thermal limits. According to Microchip thermal guidelines, derate to 70 mA total GPIO current in industrial environments above 70C ambient.
Compliance Information
RoHS compliant per Microchip product page. The -I/SS suffix indicates industrial temperature grade (-40C to +85C) and SSOP package. AEC-Q100 qualification is not claimed for the standard PIC18F24K42; automotive customers should verify with Microchip for AEC-Q100-qualified variants. Lead-free is standard on all K42 parts per Microchip documentation.
