PIC18F24K40-E/SS - 16KB Flash 28-pin XLP MCU | Microchip
MPN: PIC18F24K40-E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.55 | $25.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.72 | $1,720.00 |
| 3,000 | $1.45 | $4,350.00 |
PIC18F24K40-E/SS Overview
An 8-bit microcontroller (MCU) is a programmable processor that executes instructions 8 bits at a time, integrating Flash program memory, SRAM data memory, EEPROM, digital I/O, and analog peripherals on a single die. In the embedded system hierarchy, the MCU sits above discrete logic ICs and below 32-bit application processors, providing deterministic control for sensor reading, actuator driving, and human-machine interface tasks. The PIC18 family extends Microchip's mid-range 8-bit core with linear memory, C-compiler friendly architecture, and rich peripheral integration.
Key features include a 10-bit ADC with computation, a 5-bit DAC, two comparators, multiple PWM/CCP channels, and 24 I/O pins capable of interrupt-on-change. The device supports up to 64 MHz operation from its internal 16 MHz HFINTOSC (4x PLL), giving 16 MIPS throughput, while XLP technology keeps active current around 5 mA at 5 V/16 MHz and standby current below 50 nA in sleep mode.
The PIC18F24K40 leverages Microchip's enhanced mid-range core with a 16-bit instruction word and 8-bit data path, providing deterministic 4-clock instruction cycles and a hardware multiplier. Its Core Independent Peripherals (CIPs) like CWG, NCO, and DSM offload waveform generation and timing from the CPU, reducing firmware complexity and improving real-time performance in closed-loop control loops.
Typical applications include low-power IoT sensor nodes, battery-powered IoT form units, industrial control and sensor conditioning, LED lighting controllers, and consumer appliances requiring 5 V tolerance. The wide 2.3-5.5 V range also makes it ideal for automotive body electronics and USB device peripherals (via the dedicated USB-capable variants in the family).
When designing with this MCU, place a 0.1 uF decoupling capacitor as close as possible to each VDD pin and a 10 uF bulk capacitor on the main rail. For low-noise analog sampling, use separate AVSS/AGND isolation and avoid routing digital signals under the ADC input traces to preserve the 10-bit ADC linearity.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving an engineer a single reference point for evaluation, BOM optimization, and lifecycle decisions.
Drop-in alternatives for PIC18F24K40-E/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 PIC18F24K40-E/SS (same form factor and footprint) — differing in ADC, Operating Temperature, Package, I/O Pins, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24K40-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F25K40-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K42-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K22-I/SS
✅ Drop-In✓ In Stock
$1.32 / Unit
View Datasheet →PIC18F24K20-I/SS
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC18F24K40-E/SS Maximum Ratings & Electrical Characteristics
| Product Family | PIC18 (XLP 18K) |
| Core | PIC18 8-bit enhanced mid-range |
| Program Memory (Flash) | 16 KB (8K x 14 words) |
| Data SRAM | 1 KB |
| Data EEPROM | 256 B |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Operating Voltage | 2.3 V to 5.5 V |
| I/O Pins | 24 |
| ADC | 10-bit ADC2 (computation) |
| DAC | 5-bit DAC |
| Comparators | 2 |
| PWM Channels | Multiple (CCP/ECCP) |
| Core Independent Peripherals | CWG, NCO, DSM, CRC/SCAN, HLT, WWDT |
| Communication | UART, SPI, I2C (MSSP) |
| Package | 28-pin SSOP (5.30 mm body) |
| Operating Temperature | -40 C to +125 C (E = extended) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 1 (unlimited) |
PIC18F24K40-E/SS Pin Configuration
| Pin 1 | RA0 — Digital I/O / analog input AN0 |
| Pin 2 | RA1 — Digital I/O / analog input AN1 |
| Pin 3 | RA2 — Digital I/O / analog input AN2 |
| Pin 4 | RA3 — Digital I/O / analog input AN3 / VREF+ |
| Pin 5 | RA4 — Digital I/O / analog input AN4 |
| Pin 6 | RA5 — Digital I/O / analog input AN5 |
| Pin 7 | VDD — Positive supply voltage |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7 — Digital I/O / analog input AN6 |
| Pin 10 | RA6 — Digital I/O / analog input AN7 |
| Pin 11 | RC0 — Digital I/O / SOSCO |
| Pin 12 | RC1 — Digital I/O / SOSCI |
| Pin 13 | RC2 — Digital I/O |
| Pin 14 | RC3 — Digital I/O / SCL (MSSP) |
| Pin 15 | RC4 — Digital I/O / SDA (MSSP) |
| Pin 16 | RC5 — Digital I/O |
| Pin 17 | RC6 — Digital I/O / TX (UART) |
| Pin 18 | RC7 — Digital I/O / RX (UART) |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0 — Digital I/O / interrupt-on-change |
| Pin 22 | RB1 — Digital I/O / interrupt-on-change |
| Pin 23 | RB2 — Digital I/O / interrupt-on-change |
| Pin 24 | RB3 — Digital I/O / interrupt-on-change |
| Pin 25 | RB4 — Digital I/O / interrupt-on-change |
| Pin 26 | RB5 — Digital I/O / interrupt-on-change |
| Pin 27 | RB6 — Digital I/O / PGC (ICD) |
| Pin 28 | RB7 — Digital I/O / PGD (ICD) |
Typical Applications
PIC18F24K40-E/SS is suitable for 6 applications: Battery-Powered IoT Sensor Node, Industrial Control and Sensor Conditioning, LED Lighting Controller, Consumer Appliance Control, Automotive Body Electronics (Non-Safety), USB HID Peripheral (Companion MCU).
Battery-Powered IoT Sensor Node
The PIC18F24K40-E/SS fits battery-powered IoT sensor nodes because its XLP architecture delivers sub-50 nA sleep current with the RTC running while providing 16 MIPS throughput when active, enabling years of life on a CR2032 coin cell. Its 10-bit ADC with computation averages sensor readings autonomously, offloading the CPU and further reducing wake-time energy. Placed as the central MCU on a small sensor PCB, the part connects a low-power sensor via I2C or analog input, sleeps until a measurement interval, and transmits via an external radio module. Unlike 32-bit ARM Cortex MCUs, the PIC18 has simpler interrupt handling, deterministic wake time, and a much lower idle current, making it the right choice when average power, not peak compute, defines battery life. Hardware divider and 1 KB RAM suffice for short IoT payloads.
Recommended
Industrial Control and Sensor Conditioning
The PIC18F24K40-E/SS is well-suited for industrial sensor conditioning boards thanks to its 2.3-5.5 V supply range, integrated 10-bit ADC, two comparators, and 5-bit DAC for closed-loop analog control. In a typical 24 V industrial bus application, the PIC18F24K40 reads a 4-20 mA current loop via the ADC, applies digital filtering, and drives a PWM output to a proportional valve. Its extended -40 to +125 C temperature rating handles factory floor conditions, while the 5 V tolerance on I/O allows direct interface to legacy industrial logic. Compared with smaller PIC10/12/16 parts, the PIC18F24K40 brings Core Independent Peripherals like the Complementary Waveform Generator (CWG), which can synthesize analog control signals in hardware without CPU intervention.
Recommended
LED Lighting Controller
The PIC18F24K40-E/SS serves LED lighting controllers exceptionally well because its 16 MIPS performance at 64 MHz and dedicated Complementary Waveform Generator (CWG) can synthesize high-resolution PWM dimming signals in hardware without CPU load. Its 10-bit ADC reads ambient light sensors and color-mixing photodiodes, while its comparators enable over-temperature protection and zero-current switching. The 24 I/O pins drive RGB or RGBA LED strings plus DMX-style control inputs. Unlike general-purpose 8-bit MCUs without CIPs, the PIC18F24K40 performs smooth fade transitions and color temperature CCT blending via hardware timers, leaving the CPU free for network stack or DMX/RDM processing. XLP low-power modes keep standby lighting fixture power under 50 mW.
Recommended
Consumer Appliance Control
The PIC18F24K40-E/SS fits consumer appliance control boards because it offers 16 KB Flash for user-interface and motor-control firmware, 24 I/O for keypad/display interfaces, and operates from a single 3.3 V or 5 V supply. In a coffee machine, washing machine, or microwave oven, the PIC18F24K40 reads touch buttons via the ADC, drives a TFT or segment LCD via SPI, and controls a brushless DC or universal motor through its ECCP and CWG peripherals. Its 16 MIPS performance runs real-time motor commutation loops without jitter, while 256 B EEPROM stores user preferences and last state across power cycles. Compared to a CPLD+MCU combo, the PIC18F24K40 reduces BOM count and PCB area.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC18F24K40-E/SS extended-temperature grade supports non-safety automotive body electronics such as seat controllers, mirror adjusters, ambient lighting drivers, and HVAC actuators. Its -40 to +125 C operating range handles under-dash thermal conditions, while the 5 V tolerance on digital I/O interfaces directly with automotive 5 V logic rails. The 10-bit ADC reads position sensors, the CWG generates PWM for motor drivers, and the comparators handle over-current protection. Unlike AEC-Q100 Grade-0/1 parts, the PIC18F24K40-E/SS targets body modules where the temp range is sufficient but full automotive qualification is not required, giving cost-effective performance in non-critical subsystems.
Recommended
USB HID Peripheral (Companion MCU)
The PIC18F24K40-E/SS works as a USB HID companion MCU in mixed USB designs where a USB-capable PIC18F24K50 sits on the main board but the user-interface panel needs a separate low-cost controller for key scanning and LED management. The PIC18F24K40's 24 I/O scan up to a 24-key matrix, while its MSSP peripheral acts as an I2C or SPI slave to the host PIC18F24K50. With XLP modes, the keypad controller draws under 30 uA average, satisfying USB suspend current requirements. Compared with a discrete logic keypad controller, the PIC18F24K40 adds flexibility for firmware-updatable keymaps and gesture recognition.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24K40-E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24K40-I/SS | PIC18F25K40-E/SS | PIC18F24K42-E/SS | PIC18F24K22-I/SS | PIC18F24K20-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Flash Memory | 16 KB | 16 KB | 32 KB | 16 KB | 16 KB | 16 KB |
| SRAM | 1 KB | 1 KB | 2 KB | 2 KB | 768 B | 768 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Maximum CPU Speed | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 48 MHz (12 MIPS) |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 12-bit | 10-bit | 10-bit |
| Operating Temperature Range | -40 to +125 C (Extended) | -40 to +85 C (Industrial) | -40 to +125 C (Extended) | -40 to +125 C (Extended) | -40 to +85 C (Industrial) | -40 to +85 C (Industrial) |
| Core Independent Peripherals | CWG, NCO, DSM, CRC, HLT, WWDT | Same as this product | Same as this product | More CIPs incl. CLC, ZCD | Fewer CIPs, no CWG | No CIPs in K20 |
Key Differentiators
- Core Independent Peripherals including CWG and DSM offload waveform generation (vs PIC18F24K22-I/SS)
- Latest-generation K40 family with XLP low-power technology (vs PIC18F24K20-I/SS)
- 5-bit DAC and dual comparators for analog signal conditioning (vs PIC18F24K50-E/SS)
Design Notes
Place a 0.1 uF ceramic decoupling capacitor as close as physically possible to each VDD pin (pins 7 and 20) and add a single 10 uF bulk capacitor on the same rail. For battery-powered designs, route VDD through a ferrite bead to suppress noise from switch-mode converters, and verify that peak supply current spikes during ADC conversion stay below the ferrite's saturation rating. Estimated: total worst-case VDD current at 64 MHz is approximately 10 mA per the datasheet DC characteristics, well within standard ferrite bead ratings.
At 64 MHz CPU clock with all peripherals active, the PIC18F24K40-E/SS draws around 8-10 mA from VDD, dissipating well under 100 mW even at 5 V supply. SSOP-28 has a typical theta_JA of approximately 80 C/W per Microchip packaging specifications, giving a junction-to-ambient rise of 8 C above ambient. No heatsinking is required for normal operation, but ventilation above 60 C ambient is recommended. The extended temperature grade E ensures full operation from -40 to +125 C.
Separate analog and digital ground regions with a single-point stitch under the MCU AVSS pin to avoid ground-loop noise on ADC readings. Keep digital signal traces (PWM, SPI clocks) at least 5 mm away from analog input traces AN0-AN7 to preserve 10-bit ADC linearity. Place the ICSP programming header (PGD/RB7, PGC/RB6, MCLR/VPP) on the same edge as the SSOP package to keep the ICSP cable short and reliable during debugging. Use a 10 kohm pull-up on MCLR and a 100 nF capacitor to ground for clean reset.
Do not exceed 5.5 V on any VDD or I/O pin; the extended-temperature K40 is not 5 V tolerant on all pins when running below 3 V. Always run the configuration bits in code at startup so that unintended reset states do not lock the I/O or disable the ADC. When migrating from PIC18F24K22 to PIC18F24K40, note that the K40 adds a 5-bit DAC and CWG peripheral on pins that may overlap with K22 PWM channels; verify pin mapping in the datasheet pin allocation table before migrating layouts.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F25K40 automotive grade for automotive body applications requiring full automotive qualification. Lead-free and halogen-free per Microchip environmental compliance documentation.
