PIC18F24K40-E/SO - 8-bit XLP MCU, 16KB Flash, 64MHz | Microchip
MPN: PIC18F24K40-E/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.15 | $2.15 |
| 10 | $1.92 | $19.20 |
| 100 | $1.65 | $165.00 |
| 500 | $1.42 | $710.00 |
| 1,000 | $1.2 | $1,200.00 |
PIC18F24K40-E/SO Overview
An 8-bit microcontroller is a single-chip computer built around an 8-bit data bus; the PIC18 lineage from Microchip Technology is positioned between traditional 8-bit controllers (e.g., 8051) and 32-bit ARM Cortex-M MCUs, offering deterministic instruction execution, low cost, and a wide peripheral set. The K40 sub-family specifically extends Microchip's XLP (eXtreme Low Power) DNA into 5V-capable silicon, bridging the gap between 3.3V-only XLP parts and legacy 5V PIC18F K-series designs.
Key features of the PIC18F24K40 include a 10-bit ADC with Computation (ADC2), a 5-bit DAC, three comparators, PWM, CCP, the Configurable Logic Cell (CLC) plus Complementary Waveform Generator (CWG), Windowed Watchdog Timer (WWDT), Hardware Limit Timer (HLT), and SCAN/CRC for memory integrity checking. Core Independent Peripherals (CIPs) such as CWG and the WWDT allow tasks like complementary PWM generation or windowed supervision without waking the CPU.
Architecturally, the device uses an 8-bit PIC18 Harvard architecture with separate program (Flash) and data (SRAM) buses and a 16-bit instruction word. This decoupling of instruction and data paths is what allows one instruction per cycle (16 MIPS at 64MHz) and predictable interrupt latency. The "E" temperature grade suffixes the part to -40C to +125C operation, suiting AEC-Q100-style automotive and harsh-industrial deployments.
Typical applications for the PIC18F24K40-E/SO include low-power sensor nodes (XLP nanoWatt XLP sleep modes drop quiescent current into the sub-uA range), fan/small-motor BLDC control via the CWG and 10-bit ADC, household appliances with user interfaces and LED driving, IoT end-node controllers, and automotive interior/sensor modules. The 5V-tolerant I/O and ample analog make it a good fit for battery chargers and industrial control boards as well.
When designing in this part, reserve adequate decoupling (100nF + bulk per VDD pin pair) close to the package, follow Microchip's in-circuit debug (ICD) guidance for ICSP pins (RB6/RB7), and verify that the chosen 5V rail tolerance is sufficient for your supervisory design. E-grade parts are the right pick when industrial or automotive temperature conformance is required.
This page consolidates real-time distributor pricing, drop-in qualified alternatives, parametric comparison data, and practical design notes - information not found in any single manufacturer datasheet source.
Drop-in alternatives for PIC18F24K40-E/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 PIC18F24K40-E/SO (same form factor and footprint) — differing in ADC, Package, Comparators, Communication, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24K40-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K40-E/ML
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC18F24K40-E/MV
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F25K40-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K22-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K40-E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC18 RISC, Harvard |
| Program Memory (Flash) | 16 KB (8K x 16 words) |
| Data SRAM | 1 KB |
| Data EEPROM | 256 bytes |
| Maximum CPU Frequency | 64 MHz (16 MIPS) |
| Supply Voltage (VDD) | 2.3 V to 5.5 V |
| Operating Temperature (E grade) | -40C to +125C |
| I/O Pins | 24 |
| ADC | 10-bit ADC2, up to 35 channels |
| DAC | 5-bit |
| Comparators | 3 |
| PWM Outputs | Yes (CCP, CWG) |
| Timers | Multiple 8/16-bit, WWDT, HLT |
| Communication | I2C, SPI, EUSART (with LIN support) |
| Package | 28-pin SOIC (300 mil, SO) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Technology | CMOS |
PIC18F24K40-E/SO Pin Configuration
| Pin 1 | RA2 — Port A bit 2 (analog/digital I/O) |
| Pin 2 | RA3 — Port A bit 3 (analog/digital I/O) |
| Pin 3 | RA4 — Port A bit 4 (analog/digital I/O) |
| Pin 4 | RA5 — Port A bit 5 (analog/digital I/O) |
| Pin 5 | VDD — Positive supply voltage |
| Pin 6 | VSS — Ground |
| Pin 7 | RA6 — Port A bit 6 (analog/digital I/O) |
| Pin 8 | RA7 — Port A bit 7 (analog/digital I/O) |
| Pin 9 | RB0 — Port B bit 0 (interrupt-on-change) |
| Pin 10 | RB1 — Port B bit 1 (interrupt-on-change) |
| Pin 11 | RB2 — Port B bit 2 (interrupt-on-change) |
| Pin 12 | RB3 — Port B bit 3 (interrupt-on-change) |
| Pin 13 | RB4 — Port B bit 4 (interrupt-on-change) |
| Pin 14 | RB5 — Port B bit 5 (interrupt-on-change) |
| Pin 15 | RB6 — Port B bit 6 / ICSP PGC (programming clock) |
| Pin 16 | RB7 — Port B bit 7 / ICSP PGD (programming data) |
| Pin 17 | RC0 — Port C bit 0 (analog/digital I/O) |
| Pin 18 | RC1 — Port C bit 1 (analog/digital I/O) |
| Pin 19 | RC2 — Port C bit 2 (analog/digital I/O) |
| Pin 20 | RC3 — Port C bit 3 / SCL (I2C clock) |
| Pin 21 | RC4 — Port C bit 4 / SDA (I2C data) |
| Pin 22 | RC5 — Port C bit 5 (analog/digital I/O) |
| Pin 23 | RC6 — Port C bit 6 / TX (EUSART transmit) |
| Pin 24 | RC7 — Port C bit 7 / RX (EUSART receive) |
| Pin 25 | RE3 — Port E bit 3 (digital only I/O) |
| Pin 26 | VDD — Positive supply voltage |
| Pin 27 | VSS — Ground |
| Pin 28 | RA0 — Port A bit 0 (analog/digital I/O) |
Typical Applications
PIC18F24K40-E/SO is suitable for 7 applications: Low-Power IoT Sensor Node, Small Fan / BLDC Motor Control, Household Appliance Control Board, Industrial Sensor & Process Monitor, Automotive Interior / Body Module, USB HID / Consumer Peripheral, Battery Charger / Power Bank Controller.
Low-Power IoT Sensor Node
The PIC18F24K40-E/SO suits battery-powered IoT sensor nodes because its XLP nanoWatt sleep current drops well below 1 uA with RTC retention, letting coin cells run for years. The integrated 10-bit ADC2 and three comparators feed sensor reads directly to the CWG or peripherals without waking the CPU, while the E-grade temp rating tolerates outdoor enclosures. Designers place the part on a 28-SOIC footprint, wake on WWDT or INT0, transmit via EUSART/SPI, and re-enter sleep. This combination of 16KB Flash and 1KB SRAM supports over-the-air bootloader stub plus application, while the 5V-tolerant I/O tolerates industrial supply rails directly.
Recommended
Small Fan / BLDC Motor Control
The Complementary Waveform Generator (CWG) and 10-bit ADC2 make the PIC18F24K40-E/SO a strong fit for low-voltage BLDC/PMSM fans, where 64MHz CPU clock plus the built-in CWG generate complementary PWM with dead-band without software overhead. Back-EMF zero-cross detection routes analog signals through on-chip comparators directly to the CWG, freeing the CPU to run a state-machine in CLC. Designers use the WWDT as a safety watcher, and the -E temperature range survives under-hood or appliance-convection environments. Standby currents remain in low uA when the fan idles.
Recommended
Household Appliance Control Board
Front-panel and user-interface logic in washing machines, dishwashers, and coffee makers frequently uses 8-bit MCUs because BOM cost dominates the bill. The PIC18F24K40-E/SO delivers 5V-tolerant I/O to drive triac interfaces, optocouplers, and 7-segment LED displays, with 16KB Flash for mode logic and EEPROM for storing user preferences across power cycles. The 10-bit ADC reads temperature from NTCs, while EUSART links to a host inverter or display module. The -40C to +125C E grade covers kitchen and laundry thermal envelopes.
Recommended
Industrial Sensor & Process Monitor
The PIC18F24K40-E/SO is well suited for 4-20 mA loop-powered sensor transmitters and panel meters because the 10-bit ADC2, three comparators, and 5V-tolerant I/O handle industrial signal ranges directly. SCAN/CRC verifies program integrity in unattended installations, while the WWDT supervises the main loop to recover from firmware faults. Designers leverage the 256-byte EEPROM for calibration constants, the EUSART for RS-485 or LIN, and the -40C to +125C E grade for plant floors. Watchdog + redundant reset paths keep the device compliant with industrial-reliability expectations.
Recommended
Automotive Interior / Body Module
Door modules, mirror controllers, and seat-position memories often pair a PIC18F24K40-E/SO with LIN transceivers because the EUSART module supports LIN, and the -E grade survives automotive cabin temperatures. The device's PWM drives small motors, the ADC reads Hall sensors and thermistors, and the EEPROM retains learned positions. The K40's CWG/CLC peripherals enable PWM and signaling without CPU load. Designers must still apply the Q-graded (AEC-Q100) variant for safety-critical modules; E-grade serves non-safety interior electronics.
Recommended
USB HID / Consumer Peripheral
For low-cost USB Human Interface Devices such as keyboards, presentation clickers, or custom gaming controllers, the PIC18F24K40-E/SO can be paired with an external USB bridge or use one of Microchip's USB-enabled K-series siblings. The 16KB Flash stores HID report descriptors and debounce logic, and the 10-bit ADC reads analog joysticks. The E grade allows operation in warmer consumer environments. EUSART and SPI connect to LED drivers and radio modules, while the WWDT supervises bus hangs.
Recommended
Battery Charger / Power Bank Controller
The PIC18F24K40-E/SO can supervise single-cell Li-ion or LiFePO4 chargers using its 10-bit ADC for voltage/current sense, 5-bit DAC for reference thresholds, and PWM for synchronous buck control. EUSART reports telemetry to a host MCU or BLE module, while the 256-byte EEPROM stores cycle-count and learning data. The -E temp grade handles desktop-charger thermal rise. The CWG peripheral supports CC/CV mode switching without CPU intervention, and the WWDT catches firmware stalls during constant-voltage transitions.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24K40-E/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24K40-I/SO | PIC18F24K40-E/ML | PIC18F25K40-I/SO | PIC18F24K22-E/SO |
|---|---|---|---|---|---|
| Package | SOIC-28 (300 mil, SO) | SOIC-28 (300 mil, SO) - same | SOIC-28 variant | SOIC-28 (300 mil, SO) - same | SOIC-28 (300 mil, SO) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 16 KB | 16 KB | 16 KB | 32 KB (+100%) | 16 KB |
| Data SRAM | 1 KB | 1 KB | 1 KB | 2 KB (+100%) | 1 KB |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Max CPU Frequency | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS |
| Operating Temperature | -40C to +125C (E grade) | -40C to +85C (I grade, narrower) | -40C to +125C (E grade) | -40C to +85C (I grade) | -40C to +125C (E grade) |
| Core Independent Peripherals (CIP) | CWG, CLC, WWDT, HLT, CRC/SCAN | CWG, CLC, WWDT, HLT, CRC/SCAN | CWG, CLC, WWDT, HLT, CRC/SCAN | CWG, CLC, WWDT, HLT, CRC/SCAN | Limited (K22 lacks CLC/HLT) |
| Supply Voltage | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V |
| Unit Price (qty 1, as of 2026-09-26) | $2.15 | $1.95 | $2.20 | $2.45 | $1.80 |
Key Differentiators
- CIP-rich K40 peripherals over legacy K22 family (vs PIC18F24K22-E/SO)
- Industrial/automotive temperature grade option (vs PIC18F24K40-I/SO)
- Balanced 16KB Flash / 1KB SRAM for cost-sensitive firmware (vs PIC18F25K40-I/SO)
Design Notes
Estimated: at 64MHz / 3.3V, active current is roughly 12 mA; in XLP sleep the part drops below 1 uA. Place one 100 nF decoupling capacitor as close as possible to each VDD/VDDCORE pin pair and a single bulk cap (>=10 uF) on the supply rail. For battery-powered designs, route the MCU's VDD via an MCP1700 3.3V LDO with sub-uA quiescent current.
Reserve an in-circuit serial programming (ICSP) header footprint for RB6/RB7 (PGC/PGD) and MCLR/VPP lines even if you do not populate it; many field-update scenarios require ISP after conformal coating. Keep the ICSP traces short (<5 cm) and away from switching nodes. A 4.7 kohm pull-up on MCLR is recommended, plus optional 100 ohm series resistor to protect against programming voltage overshoot.
Do not enable peripherals (ADC, EUSART, timers) without first configuring their TRIS and ANSEL registers - analog pins default to digital mode on reset. The PIC18F24K40's PPS (Peripheral Pin Select) module lets you remap EUSART/SPI to most I/O pins, but misconfigured PPS locks the peripheral to a default pin. Verify oscillator configuration bits match your crystal/oscillator before sealing firmware.
PIC18F24K40-E/SO is rated -40C to +125C; derate current drive if many I/O simultaneously source/sink near 25 mA per pin. At higher ambient (>85C), rely on the WWDT and on-chip ADC2 thermal indicator to flag overheating. Estimated: continuous 20 mA load on four I/Os at 125C ambient can push theta-JA figures higher; allocate copper pour for heat spreading.
Compliance Information
E grade supports -40C to +125C but is not formally AEC-Q100 qualified; for AEC-Q100 use the Q-graded PIC18F24K40 Q-family variant. RoHS/REACH compliance per Microchip product page.
