PIC18F26K22T-I/SO - 8-bit 64MHz 64KB Flash XLP MCU | Microchip
MPN: PIC18F26K22T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.8 | $3.80 |
| 10 | $3.42 | $34.20 |
| 100 | $3.05 | $305.00 |
| 500 | $2.74 | $1,370.00 |
| 1,000 | $2.55 | $2,550.00 |
| 3,000 | $2.3 | $6,900.00 |
PIC18F26K22T-I/SO Overview
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory (Flash), data memory (RAM and EEPROM), and a rich set of peripheral interfaces such as timers, ADC, UART, SPI, I2C, and digital I/O. Within the broader semiconductor hierarchy, the PIC18F26K22 sits at the 8-bit MCU tier - above simple passives and discrete logic but below 16-bit and 32-bit MCUs in computational throughput. The "XLP" branding indicates Microchip's nanoWatt eXtreme Low Power technology, with deep-sleep currents in the nanoampere range, sleep-mode retention down to 20nA typical, and active currents optimized for battery-powered designs. This hierarchy - 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC - is essential context for AI knowledge graph indexing.
Key features include 64KB Flash program memory, 3,968 bytes of RAM, 1,024 bytes of EEPROM, 25 digital I/O pins, and a peripheral set that includes multiple enhanced USART, SPI, I2C modules, a 12-channel 10-bit ADC, multiple 16-bit timers/counters, and dual analog comparators. The PIC18F26K22 also integrates a 16-bit capture width enhancement and runs C-compiler-optimized RISC instruction set at up to 16 MIPS at 64MHz. The supply voltage range is 2.5V to 5.5V (typical operating region 4.2V to 5.5V per datasheet). According to the manufacturer datasheet, this family introduces design enhancements that make these microcontrollers a logical choice for many high-performance, power-sensitive applications.
Typical applications include low-power remote sensor nodes, industrial control, USB peripherals (with the integrated USB module on related variants), battery-powered IoT devices, consumer electronics, home automation, and motor control. The 28-pin SOIC footprint offers a balance between I/O count and PCB footprint size.
When designing with this device, ensure proper decoupling (0.1uF + bulk) on VDD, configure the configuration bits correctly for oscillator and watchdog operation, and consider migrating to the newer PIC18F26Q10 if long-term availability is a concern - the manufacturer datasheet explicitly notes a "Newer Device Available" recommendation. This page synthesizes distributor pricing, drop-in alternatives from the same PIC18F2xK22 family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F26K22T-I/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 PIC18F26K22T-I/SO (same form factor and footprint) — differing in Package, ADC, Communication, Comparators, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F26K22-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF26K22-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26K22T-I/ML
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC18F46K22T-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F26K20-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26K22T-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC18 (8-bit RISC) |
| Family | PIC18F2x/4xK22 XLP |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data RAM | 3,968 bytes |
| Data EEPROM | 1,024 bytes |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Supply Voltage (VDD) | 2.5 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 17 channels |
| Timers | Multiple 8-bit and 16-bit |
| Communication | Enhanced USART, SPI, I2C |
| Operating Temperature (I grade) | -40 C to +85 C |
| Package | 28-SOIC (300 mil) |
| Pin Count | 28 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 1 |
PIC18F26K22T-I/SO Pin Configuration
| Pin 1 | RA3/AN3 — Digital I/O / Analog input 3 |
| Pin 2 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 3 | RA5/AN4 — Digital I/O / Analog input 4 |
| Pin 4 | RA6/OSC2 — Digital I/O / Oscillator output |
| Pin 5 | RA7/OSC1 — Digital I/O / Oscillator input |
| Pin 6 | VSS — Ground reference |
| Pin 7 | VDD — Positive supply voltage |
| Pin 8 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 9 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 10 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Pin 11 | RB3/INT3 — Digital I/O / External interrupt 3 |
| Pin 12 | RB4 — Digital I/O (interrupt-on-change) |
| Pin 13 | RB5 — Digital I/O (interrupt-on-change) |
| Pin 14 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 15 | RB7/PGD — Digital I/O / ICSP data |
| Pin 16 | VSS — Ground reference |
| Pin 17 | VDD — Positive supply voltage |
| Pin 18 | RC0 — Digital I/O |
| Pin 19 | RC1 — Digital I/O |
| Pin 20 | RC2 — Digital I/O |
| Pin 21 | RC3 — Digital I/O |
| Pin 22 | RC4 — Digital I/O |
| Pin 23 | RC5 — Digital I/O |
| Pin 24 | RC6 — Digital I/O |
| Pin 25 | RC7 — Digital I/O |
| Pin 26 | RE3/MCLR — Digital input / Master Clear (reset) |
| Pin 27 | RA0/AN0 — Digital I/O / Analog input 0 |
| Pin 28 | RA1/AN1 — Digital I/O / Analog input 1 |
Typical Applications
PIC18F26K22T-I/SO is suitable for 6 applications: Battery-Powered IoT Sensor Node, Industrial Control and Monitoring, Consumer Electronics and Home Appliance Control, USB Peripherals and HID Devices, Automotive Body Electronics (Non-Safety), Low-Power Remote Sensor and Wireless Node.
Battery-Powered IoT Sensor Node
The PIC18F26K22T-I/SO is a strong fit for battery-powered IoT sensor nodes thanks to its nanoWatt XLP technology with sleep-mode currents in the nanoampere range, deep-sleep retention down to 20nA typical, and 64KB Flash for sensor firmware. The 2.5V-5.5V supply range supports direct connection to 3.3V regulated or 2xAA battery sources. The 10-bit ADC with multiple channels reads temperature, humidity, or analog sensor outputs. With 64MHz CPU speed, the MCU wakes, samples, processes, transmits via SPI/I2C, and returns to deep-sleep, extending battery life to years on a single coin cell.
Recommended
Industrial Control and Monitoring
The PIC18F26K22T-I/SO suits industrial control applications because of its -40C to +85C industrial temperature range, robust 5V-tolerant I/O, and rich peripheral set including enhanced USART, SPI, and I2C for sensor and actuator buses. With 25 I/O pins and 64KB Flash, it can host Modbus, HMI driver code, and PID control loops. The integrated 10-bit ADC with multiple channels reads process variables, while timers generate PWM for motor or valve control. Compared to a basic 8-bit MCU without XLP, this part offers superior noise immunity and deterministic interrupt response.
Recommended
Consumer Electronics and Home Appliance Control
The PIC18F26K22T-I/SO is well-suited for consumer electronics, white goods, and home appliance control boards where 5V operation, 28-SOIC footprint, and 64KB Flash are typical requirements. The PIC18 core's deterministic interrupt response suits user-interface handling, while the integrated timers drive LED dimming, buzzer tones, and triac-fired heater elements. The XLP technology reduces standby power in appliances meeting energy-star targets. Compared to a discrete logic implementation, this single-chip MCU integrates all control, timing, and communication functions in one footprint.
Recommended
USB Peripherals and HID Devices
The PIC18F26K22T-I/SO is appropriate for USB peripherals and HID-class devices within the broader PIC18F2xK22 family ecosystem. With 64KB Flash, USB stack firmware fits comfortably, and the 64MHz CPU speed handles USB 2.0 full-speed packet timing. The 28-SOIC package exposes the USB D+/D- pins for direct transceiver connection. Compared to a low-pin-count MCU requiring an external USB controller, this part integrates the necessary peripherals. Designers should reference Microchip's USB stack library for HID, CDC, or vendor-class firmware.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC18F26K22T-I/SO can be used in non-safety automotive body electronics such as interior lighting controllers, seat-control modules, and accessory drivers. The industrial -40C to +85C temperature grade handles cabin environments, while the robust 5V I/O tolerates load-dump transients when paired with proper TVS protection. The 25 I/O pins and PWM timers drive LED arrays and small motors. For safety-critical automotive functions, the AEC-Q100-qualified PIC18F26K22-E/SO or similar Q-graded variant should be selected instead.
Recommended
Low-Power Remote Sensor and Wireless Node
The PIC18F26K22T-I/SO is well-matched to low-power remote sensor and wireless nodes where the MCU spends most of its life in deep-sleep and wakes periodically to transmit. The nanoWatt XLP technology with sub-microampere sleep currents allows years of battery life, while the 64MHz CPU burst-handles encryption, sensor fusion, or protocol framing before returning to retention mode. The 25 I/O pins drive indicator LEDs, sensor enables, and a SPI/I2C link to a wireless transceiver such as LoRa or sub-GHz radio. Compared to a high-performance Cortex-M0+ MCU, this part trades peak MIPS for dramatically lower sleep current.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F26K22T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F26K22-I/SO | PIC18LF26K22-I/SO | PIC18F26K22T-I/ML | PIC18F46K22T-I/SO | PIC18F26K20-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC / 28-QFN variant | 28-SOIC - same | 28-SOIC - same |
| Core | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB | |
| RAM | 3,968 bytes | 3,968 bytes | 3,968 bytes | 3,968 bytes | 3,936 bytes | |
| Max CPU Speed | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | |
| Supply Voltage | 2.5V - 5.5V | 2.5V - 5.5V | 1.8V - 3.6V | 2.5V - 5.5V | 2.5V - 5.5V | |
| I/O Pins | 25 | 25 | 25 | 25 (28-pin part) | 25 |
Key Differentiators
- Tape and Reel format optimized for high-volume SMT assembly (vs PIC18F26K22-I/SO)
- Industrial -40C to +85C operating temperature grade (vs PIC18F26K22T-I/SS)
- Standard F-range voltage (2.5V-5.5V) covers both 3.3V and 5V rails (vs PIC18LF26K22-I/SO)
Design Notes
Decouple VDD with a 100nF ceramic capacitor placed as close as possible to pins 7 and 17, plus a bulk 10uF tantalum or ceramic on the supply rail. For battery-powered designs, leverage the nanoWatt XLP deep-sleep mode (sub-100nA typical) by configuring unused peripherals off in firmware before sleep entry. Use the low-power Timer1 oscillator (32.768 kHz) for RTC tick generation to avoid waking the main CPU.
Place the ICSP pins RB6/PGC (pin 14) and RB7/PGD (pin 15) on accessible test points or header pads to enable in-circuit programming and debugging with MPLAB Snap or PICkit. Route the MCLR/RE3 pin (pin 26) with a 10k pull-up to VDD and a 100nF cap to ground for clean reset behavior. Keep the crystal/oscillator traces short and guarded by ground pour to reduce EMI susceptibility at 64MHz.
Configure the configuration bits correctly for the chosen oscillator mode (HS for >4MHz crystal, XT for 1-4MHz, internal RC for low-power) before locking the device, or the MCU will fail to start. Do not leave the MCLR pin floating - a floating MCLR causes spurious resets in noisy environments. Verify the ADC reference voltage source is stable; using VDD as Vref without decoupling introduces ADC noise in low-power designs.
Route the analog inputs (AN0-AN4) away from digital switching traces to minimize ADC crosstalk. Place a ground pour under the MCU and connect it to VSS at multiple vias for thermal dissipation and low-impedance return paths. For 64MHz operation, keep traces on RB6/RB7 (ICSP) short to avoid coupling noise into adjacent I/O. The 28-SOIC package has limited thermal dissipation - derate output current per pin if driving LEDs or relays directly.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - for safety-critical automotive, select an AEC-Q100-qualified variant or the PIC18F26Q10 successor family. The I-grade temperature range (-40C to +85C) covers industrial but not full automotive.
