PIC18F27K40-I/SP - 64MHz 8-bit MCU 128KB Flash 28-SPDIP | Microchip
MPN: PIC18F27K40-I/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.07 | $4.07 |
| 10 | $3.74 | $37.40 |
| 100 | $3.21 | $321.00 |
| 500 | $2.78 | $1,390.00 |
| 1,000 | $2.45 | $2,450.00 |
PIC18F27K40-I/SP Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and a configurable peripheral set on one die. The PIC18 family uses an 8-bit modified Harvard architecture with separate program and data buses, optimized for deterministic interrupt response and low-power operation. Within Microchip's taxonomy, the PIC18F27K40 sits in the PIC18 "K-series" (low-power, XLP, 5 V) and is upward-compatible with the PIC16 instruction set, allowing code reuse from older designs.
Key feature highlights of the PIC18F27K40-I/SP include 64 MHz maximum CPU clock (16 MIPS instruction throughput), 1.8 V to 5.5 V wide operating voltage range, eXtreme Low Power (XLP) modes with nanoWatt technology for sleep currents down to the sub-microamp region, and 36 instruction set additions over baseline PIC18. The 28-SPDIP package (Industrial -40 °C to +85 °C) supports through-hole assembly and breadboard-friendly prototyping.
Architecturally the device leverages Microchip's Core Independent Peripherals (CIPs) - CWG, PWM, CCP, ADC with Computation, CRC/SCAN and ZCD - to offload tasks traditionally handled by the CPU. This enables deterministic event-driven behaviour, lower active-mode CPU loading and longer battery life. The Peripheral Pin Select (PPS) remapping further simplifies PCB routing on multi-function pins.
Typical applications include industrial sensor nodes, low-power IoT endpoints, battery-powered home automation, automotive body and aftermarket modules (sub-system level), and consumer white goods with touch / display interfaces. The 5 V tolerance makes it well-suited to legacy 5 V analog front-ends.
When designing with this part, plan the Peripheral Pin Select (PPS) map early - most digital peripherals are remappable, but ADC inputs are not. Allocate adequate decoupling (100 nF per VDD pair) and reserve a robust in-circuit serial programming (ICSP) header for production-line firmware updates. This page consolidates current distributor pricing and pin-compatible alternatives not summarized in the manufacturer datasheet.
Drop-in alternatives for PIC18F27K40-I/SP — 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 PIC18F27K40-I/SP (same form factor and footprint) — differing in ADC, Package, Program Memory (Flash), Core Architecture, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F27K40-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26K40-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F25K40-I/SP
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F27K42-I/SP
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →PIC18F27Q10-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F27K40-I/SP Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit (modified Harvard) |
| Family | PIC18 K-series (XLP, 5 V) |
| CPU Clock Speed | 64 MHz max (16 MIPS) |
| Program Memory (Flash) | 128 KB (64K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Operating Temperature Range | -40 °C to +85 °C (Industrial) |
| Package | 28-pin SPDIP (Skinny Plastic DIP) |
| Mounting Type | Through-Hole |
| Pin Count | 28 |
| ADC | 10-bit ADC2 |
| DAC | 5-bit DAC |
| Low-Power Features | XLP / nanoWatt (eXtreme Low Power) |
| Communication Interfaces | EUSART, SPI, I2C |
| Core Independent Peripherals (CIP) | CWG, WWDT, CRC/SCAN, CCP, PWM, ZCD, HLT |
| Peripheral Pin Select (PPS) | Yes |
| RoHS Status | Compliant |
| MSL Level | 1 (unlimited) |
PIC18F27K40-I/SP Pin Configuration
| Pin 1 | /MCLR — Master Clear (Reset) input, programmable weak pull-up; also ICSP programming voltage |
| Pin 2 | RA0 — Port A bit 0 / analog AN0 / CCP1 / ICSPDAT |
| Pin 3 | RA1 — Port A bit 1 / analog AN1 / CCP2 / ICSPCLK |
| Pin 4 | RA2 — Port A bit 2 / analog AN2 / DAC / comparator input |
| Pin 5 | RA3 — Port A bit 3 / analog AN3 / comparator input |
| Pin 6 | RA4 — Port A bit 4 / analog AN4 / T0CKI / CCP5 |
| Pin 7 | RA5 — Port A bit 5 / analog AN5 / PWM |
| Pin 8 | RE3 — Port E bit 3, digital-only input |
| Pin 9 | RA6 — Port A bit 6 / oscillator |
| Pin 10 | RA7 — Port A bit 7 / oscillator |
| Pin 11 | VSS — Ground reference |
| Pin 12 | VDD — Positive supply voltage (1.8 V to 5.5 V) |
| Pin 13 | RB0 — Port B bit 0 / INT0 / ZCD / PWM |
| Pin 14 | RB1 — Port B bit 1 / INT1 / CWG / PWM |
| Pin 15 | RB2 — Port B bit 2 / INT2 / PWM |
| Pin 16 | RB3 — Port B bit 3 / INT3 / PWM |
| Pin 17 | RB4 — Port B bit 4 / I2C SDA / PWM |
| Pin 18 | RB5 — Port B bit 5 / I2C SCL / PWM |
| Pin 19 | RB6 — Port B bit 6 / ICPGC (ICSP clock) / PWM |
| Pin 20 | RB7 — Port B bit 7 / ICPGD (ICSP data) / PWM |
| Pin 21 | RC0 — Port C bit 0 / PWM / EUSART TX |
| Pin 22 | RC1 — Port C bit 1 / PWM / EUSART RX |
| Pin 23 | RC2 — Port C bit 2 / PWM / SPI SCK |
| Pin 24 | RC3 — Port C bit 3 / PWM / SPI SDI |
| Pin 25 | RC4 — Port C bit 4 / PWM / SPI SDO |
| Pin 26 | RC5 — Port C bit 5 / PWM |
| Pin 27 | RC6 — Port C bit 6 / PWM |
| Pin 28 | RC7 — Port C bit 7 / PWM |
Typical Applications
PIC18F27K40-I/SP is suitable for 6 applications: Industrial Sensor Node, Low-Power IoT / Battery Endpoint, Home Appliance Control Board, Automotive Body and Aftermarket Modules, USB-Powered Consumer Devices, Educational and Hobby Electronics.
Industrial Sensor Node
The PIC18F27K40-I/SP fits industrial sensor nodes that must run from 24 V industrial rails and survive harsh electrical environments. Its 1.8 V to 5.5 V supply range accommodates a wide-window buck regulator, and the integrated 10-bit ADC2 with hardware Computation (ADC2) averages multiple samples for noise-immune readings from RTDs, thermistors, or 4-20 mA loops. The XLP nanoWatt sleep currents (sub-microamp region, per datasheet) allow 10+ year battery life on a metering node. EUSART and I2C peripherals handle Modbus RTU or IO-Link communication. Designers can route CIPs (CWG, PWM, CCP) to drive actuator bridges directly, offloading real-time work from the 16 MIPS CPU and reducing firmware complexity.
Recommended
Low-Power IoT / Battery Endpoint
For battery-driven IoT endpoints (smart locks, leak detectors, BLE beacons), the PIC18F27K40-I/SP's XLP nanoWatt features deliver sub-microamp sleep currents with RTC running from a 32 kHz crystal, per the Microchip PIC18(L)F27/47K40 datasheet. The 64 MHz HFINTOSC wakes the part in microseconds for burst radio TX events, then returns to sleep, preserving coin-cell life. The 4 KB SRAM is sufficient for an MQTT-SN or BLE link-layer buffer without external memory. CIP-based event handling (CWG + ZCD) lets wake-on-mains-zero-cross events run without CPU intervention, ideal for energy-harvesting switch closures and PIR motion nodes.
Recommended
Home Appliance Control Board
The PIC18F27K40-I/SP is well-suited to white-goods control boards (washing machines, dishwashers, microwave ovens) that mix 5 V analog front-ends with 3.3 V digital logic. Its 5 V tolerance on digital I/O removes the need for level shifters when interfacing legacy HMI displays, triac drivers and zero-cross optos. The integrated CWG, CCP and PWM channels can drive three-phase brushless DC pumps directly through gate drivers. The 128 KB Flash holds a full motor-control state machine plus a graphical LCD interface. Peripheral Pin Select lets designers place the EUSART (modem), SPI (display) and I2C (sensor) on convenient PCB pins without re-routing the MCU.
Recommended
Automotive Body and Aftermarket Modules
For automotive body controllers, aftermarket telematics and gauge clusters, the PIC18F27K40-I/SP's 5 V tolerance, -40 °C to +85 °C Industrial grade and robust peripheral set cover sub-system level designs. Designers needing AEC-Q100 qualification should select the -Q1 suffix (PIC18F27K40-I/SP -Q1) on the same die. The CIP suite handles LIN slave communication (via EUSART + timer), PWM-driven LED tail-light fading, and ADC sampling of battery voltage and temperature. PPS remapping keeps the 28-SPDIP layout simple even with multiple peripheral buses. Flash endurance of 10 k cycles (typical) supports infrequent OTA firmware updates in body-domain ECUs.
Recommended
USB-Powered Consumer Devices
Consumer products powered from USB (5 V) - including keyboards, mice, USB hubs, audio interfaces and HID controllers - leverage the PIC18F27K40-I/SP's native 5 V tolerance and 64 MHz core. Although the part lacks an integrated USB PHY, designers can pair it with the external MCP2200 USB-UART bridge or MCP2221 USB-I2C/SPI bridge for low-cost USB connectivity. The PWM/CCP block can drive RGB underglow or status LEDs directly, while the 10-bit ADC reads user potentiometers. The 128 KB Flash accommodates USB HID class descriptors, customer-facing firmware, and a small bootloader - all in the 28-SPDIP through-hole package which simplifies bench prototyping.
Recommended
Educational and Hobby Electronics
The 28-SPDIP through-hole PIC18F27K40-I/SP is breadboard-friendly and a popular choice for educators, students and hobbyists building PIC-based projects with MPLAB X IDE and XC8. Its 128 KB Flash, 4 KB SRAM and rich peripheral set (ADC, PWM, EUSART, SPI, I2C) cover the full PIC18F curriculum without forcing a memory upgrade mid-semester. The Industrial -40 °C to +85 °C grade lets student prototypes survive classroom handling and outdoor demos. PICkit 4 or MPLAB Snap in-circuit debuggers plug directly into the 28-SPDIP ICSP pads, supporting live breakpoints and watch windows essential for learning embedded programming.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F27K40-I/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F27K40-I/SO | PIC18F26K40-I/SP | PIC18F25K40-I/SP | PIC18F27K42-I/SP | PIC18F27Q10-I/SP |
|---|---|---|---|---|---|---|
| Package | 28-SPDIP (SP) | 28-SOIC | 28-SPDIP - same | 28-SPDIP - same | 28-SPDIP - same | 28-SPDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 64 KB | 32 KB | 128 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 8 KB | 4 KB |
| EEPROM | 256 B | 256 B | 1 KB | 256 B | 1 KB | 1 KB |
| Max CPU Clock | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| ADC | 10-bit ADC2 | 10-bit ADC2 | 10-bit ADC2 | 10-bit ADC2 | 12-bit ADC | 12-bit ADC |
| Core Independent Peripherals | CWG, WWDT, ZCD, CRC/SCAN, PWM/CCP | Same set | Same set | Same set | Enhanced CIP set + DMA | Enhanced CIP set + DMA |
Key Differentiators
- Largest Flash in the K-series 28-SPDIP family (vs PIC18F26K40-I/SP)
- 5 V tolerance with XLP nanoWatt sleep (vs PIC18F27K42-I/SP)
- Established CIP suite vs first-generation DMA (vs PIC18F27Q10-I/SP)
Design Notes
Estimated: at 64 MHz / 5 V supply the PIC18F27K40-I/SP active current is approximately 8-10 mA; dropping to 1 MHz reduces active current to roughly 200-400 uA. For battery designs, use IDLE and DOZE modes plus PMD (Peripheral Module Disable) registers to gate unused peripherals. A 100 nF ceramic decoupling cap on each VDD pin placed within 3 mm of the pin, plus a bulk 10 uF tantalum or ceramic at the regulator output, suppresses switching noise from digital I/O transitions.
Route the ICSP / ICPGC (RB6) and ICSPGD (RB7) pins directly to a programming header with no series resistors; the PICkit 4 / MPLAB Snap debugger drives these signals directly. Reserve 5 V tolerance on the /MCLR pin with a 10 k-47 k pull-up to VDD, and add a 100 nF cap to ground for reset-noise immunity. Keep the 32.768 kHz crystal traces short and guard the SOSCO/SOSCI pins with a ground ring to avoid mains-frequency pickup on RTC-accurate timing.
Do not assume the ADC reference defaults to VDD - PIC18 K-series ADCs need an explicit ADCON1 configuration; leaving VREF+ floating can produce full-scale drift. PPS (Peripheral Pin Select) registers default to RESET state on every POR, so firmware must reconfigure them before first use of EUSART, SPI, I2C or PWM - otherwise the peripheral simply does not output. Last: datasheet input voltage absolute maximum is 5.5 V - exceeding this on 5 V tolerant pins (RA0-RA5) during ICSP programming will trigger latch-up.
Estimated: for SPI bus speeds above 8 MHz at 5 V, route the SCK, SDO and SDI traces as a 3-wire matched-length group and add 33 ohm series termination at the master pins to dampen ringing on long stubs. The I2C pins (RB4/RB5) require external 4.7 k-10 k pull-ups - the K-series has weak internal pull-ups but they are not strong enough for 400 kHz Fast Mode. Use SMBus-level thresholding in firmware if the bus is shared with line-powered sensor modules.
Compliance Information
RoHS and lead-free confirmed per Microchip product page. REACH compliance standard for Microchip 8-bit PIC family. AEC-Q100 grade requires the /SP -Q1 variant. Halogen-free status not explicitly published for this part number - confirm with Microchip sales.
