PIC18F66K22T-I/PTRSL - 64KB Flash 8-bit XLP MCU | Microchip
MPN: PIC18F66K22T-I/PTRSL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.4 | $6.40 |
| 10 | $5.95 | $59.50 |
| 100 | $5.4 | $540.00 |
| 500 | $4.85 | $2,425.00 |
| 1,000 | $4.2 | $4,200.00 |
PIC18F66K22T-I/PTRSL Overview
An 8-bit microcontroller (MCU) is a programmable integrated circuit that combines a CPU, memory (Flash/ROM, RAM, EEPROM), digital I/O, and analog/mixed peripherals on a single silicon die, optimized for embedded control tasks. Within Microchip's portfolio, the PIC18F architecture occupies the mid-to-high performance tier of 8-bit MCUs, sitting above baseline PIC10/12/16 parts and below the dsPIC/PIC32 16-bit and 32-bit families. Within that hierarchy, the PIC18F66K22 belongs to the PIC18F K22 sub-family which is distinguished by nanoWatt XLP ultra-low-power technology, making it well suited for battery-powered and energy-harvesting applications.
Key features include 64 MHz maximum CPU clock with up to 16 MIPS throughput, hardware multipliers for efficient arithmetic, an integrated LCD driver, capacitive touch via CTMU, multiple capture/compare/PWM modules, and a wide 1.8V to 5.5V operating voltage range. The XLP technology offers sleep currents below 100 nA typical, and peripheral modules can be selectively disabled to minimize active current.
The PIC18F66K22 family uses a 16-bit modified-Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and data access. Flash program memory is self-programmable under firmware control, supporting in-application updates over UART, I2C, or SPI. On-chip debugging is supported through Microchip's ICD (In-Circuit Debugger) interface using just two I/O pins.
Typical applications include capacitive touch user interfaces, battery-powered sensor hubs, LCD-displayed consumer products, industrial control panels, and low-power IoT edge nodes. Designers select the PIC18F66K22 for applications needing 8-bit simplicity with extended RAM/Flash and rich analog peripherals.
When designing with this MCU, allocate adequate decoupling (100 nF + bulk cap) near each power pin, keep trace lengths to the ICSP/ICD pins short, and verify the Vdd range for the chosen clock mode. The wide 1.8V-5.5V range simplifies both lithium-battery and USB/5V designs.
This page consolidates distributor pricing, drop-in alternatives in the same TQFP-64 footprint, and practical design notes for the PIC18F66K22T-I/PTRSL not found in the manufacturer datasheet.
Drop-in alternatives for PIC18F66K22T-I/PTRSL — 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 PIC18F66K22T-I/PTRSL (same form factor and footprint) — differing in Package, Program Memory (Flash), Operating Temperature, Core Architecture, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F66K22-I/PTRSL
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66K22T-I/PT
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC18F65K22T-I/PTRSL
✅ Drop-In✓ In Stock
$2.52 / Unit
View Datasheet →PIC18F67K22-I/PT
✅ Drop-In✓ In Stock
$4.6 / Unit
View Datasheet →PIC18F66K22-E/PT
✅ Drop-In✓ In Stock
$5.8 / Unit
View Datasheet →PIC18F66K22T-I/PTRSL Maximum Ratings & Electrical Characteristics
| Series | PIC18F K-series, XLP nanoWatt |
| Core Architecture | PIC18 (8-bit modified Harvard) |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data RAM | 4 KB |
| Data EEPROM | 1 KB |
| Maximum CPU Frequency | 64 MHz |
| I/O Pins | 54 |
| CTMU (Capacitive Touch) | Yes |
| Operating Temperature | -40C to +85C (Industrial, -I suffix) |
| Package | 64-pin TQFP (10x10 mm, 1.0 mm height) |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Lead-free, RoHS compliant |
| Programming/Debug | ICSP, ICD (2-wire) |
PIC18F66K22T-I/PTRSL Pin Configuration
| Pin 1 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Pin 2 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Pin 3 | RB2 — PORTB bit 2 |
| Pin 4 | RB3 — PORTB bit 3 |
| Pin 5 | RB4 — PORTB bit 4 |
| Pin 6 | RB5 — PORTB bit 5 |
| Pin 7 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 8 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply |
| Pin 11 | RC0 — PORTC bit 0 |
| Pin 12 | RC1 — PORTC bit 1 |
| Pin 13 | RC2 — PORTC bit 2 |
| Pin 14 | RC3 — PORTC bit 3 |
| Pin 15 | RC4 — PORTC bit 4 |
| Pin 16 | RC5 — PORTC bit 5 |
| Pin 17 | RC6/TX1 — PORTC bit 6 / EUSART1 TX |
| Pin 18 | RC7/RX1 — PORTC bit 7 / EUSART1 RX |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply |
| Pin 21 | RD0 — PORTD bit 0 |
| Pin 22 | RD1 — PORTD bit 1 |
| Pin 23 | RD2 — PORTD bit 2 |
| Pin 24 | RD3 — PORTD bit 3 |
| Pin 25 | RD4 — PORTD bit 4 |
| Pin 26 | RD5 — PORTD bit 5 |
| Pin 27 | RD6 — PORTD bit 6 |
| Pin 28 | RD7 — PORTD bit 7 |
| Pin 29 | VSS — Ground reference |
| Pin 30 | VDD — Positive supply |
| Pin 31 | RE0 — PORTE bit 0 |
| Pin 32 | RE1 — PORTE bit 1 |
| Pin 33 | RE2 — PORTE bit 2 |
| Pin 34 | RE3 — PORTE bit 3 |
| Pin 35 | RE4 — PORTE bit 4 |
| Pin 36 | RE5 — PORTE bit 5 |
| Pin 37 | RE6 — PORTE bit 6 |
| Pin 38 | RE7 — PORTE bit 7 |
| Pin 39 | VSS — Ground reference |
| Pin 40 | VDD — Positive supply |
| Pin 41 | RF0 — PORTF bit 0 |
| Pin 42 | RF1 — PORTF bit 1 |
| Pin 43 | RF2 — PORTF bit 2 |
| Pin 44 | RF3 — PORTF bit 3 |
| Pin 45 | RF4 — PORTF bit 4 |
| Pin 46 | RF5 — PORTF bit 5 |
| Pin 47 | RF6 — PORTF bit 6 |
| Pin 48 | RF7 — PORTF bit 7 |
| Pin 49 | VSS — Ground reference |
| Pin 50 | VDD — Positive supply |
| Pin 51 | RG0 — PORTG bit 0 |
| Pin 52 | RG1 — PORTG bit 1 |
| Pin 53 | RG2 — PORTG bit 2 |
| Pin 54 | RG3 — PORTG bit 3 |
| Pin 55 | RG4 — PORTG bit 4 |
| Pin 56 | RA0 — PORTA bit 0 |
| Pin 57 | RA1 — PORTA bit 1 |
| Pin 58 | RA2 — PORTA bit 2 |
| Pin 59 | RA3 — PORTA bit 3 |
| Pin 60 | RA4 — PORTA bit 4 |
| Pin 61 | RA5 — PORTA bit 5 |
| Pin 62 | OSC1 — Crystal oscillator input |
| Pin 63 | OSC2 — Crystal oscillator output |
| Pin 64 | RA7 — PORTA bit 7 |
Typical Applications
PIC18F66K22T-I/PTRSL is suitable for 6 applications: Capacitive Touch User Interface, Battery-Powered Sensor Hub, LCD-Display Consumer Appliance, Industrial Control Panel, IoT Edge Sensor Node, Automotive Body Control Module.
Capacitive Touch User Interface
The PIC18F66K22T-I/PTRSL is purpose-built for capacitive touch front panels thanks to its on-chip CTMU (Charge Time Measurement Unit) and Microchip's mTouch sensing library. The CTMU can measure capacitance on any digital I/O pin with sub-picofarad resolution, enabling reliable button, slider, and proximity sensing without external touch ICs. Combined with nanoWatt XLP sleep currents below 100 nA, the MCU enables wake-on-touch designs that draw under 1 microamp during standby - perfect for battery-powered appliances and remote controls. The 54 I/O pins drive both the touch matrix and LCD driver for combined touchscreen+display interfaces.
Recommended
Battery-Powered Sensor Hub
Energy-harvesting and battery-powered sensor networks benefit from the PIC18F66K22T-I/PTRSL's nanoWatt XLP technology, which achieves sub-100 nA sleep current with full RAM retention. The wide 1.8V to 5.5V Vdd range supports direct connection to single-cell lithium, two-cell alkaline, or USB/5V rails without level shifting. The 12-bit ADC (multiple channels) combined with CTMU enables direct sensor interfacing for temperature, humidity, and capacitive level measurement. The 64 KB Flash accommodates over-the-air firmware update (OTA) routines for IoT edge node applications where field service is impractical.
Recommended
LCD-Display Consumer Appliance
Consumer appliances such as coffee makers, microwave ovens, and HVAC thermostats often use the PIC18F66K22T-I/PTRSL for its integrated LCD segment driver and rich peripheral set. The on-chip LCD driver supports up to 192 segments, eliminating external display driver chips and reducing BOM cost. The 54 GPIO pins drive both LCD segments and keypads simultaneously, while multiple timer/capture/PWM modules handle motor control and triac dimming. The CTMU handles modern capacitive-button overlays without separate touch ICs, and the industrial -40C to +85C grade handles kitchen and garage environments.
Recommended
Industrial Control Panel
Factory automation panels benefit from the PIC18F66K22T-I/PTRSL's industrial temperature grade, robust peripheral set, and on-chip self-programming. The 64 KB Flash accommodates Modbus RTU/TCP protocol stacks, while 4 KB RAM handles messaging buffers. Multiple UART ports (typically 2-3) support simultaneous connection to a host controller plus sensor slaves; SPI bus interfaces to external flash or display controllers at high speed. The CTMU enables sealed capacitive control surfaces that survive factory washdown environments where mechanical switches would fail. The extended operating temperature handles cabinet-mounted installations in cold or hot factory zones.
Recommended
IoT Edge Sensor Node
Low-power IoT edge nodes that bridge local sensors to cloud gateways leverage the PIC18F66K22T-I/PTRSL's combination of sleep current under 100 nA, peripheral-rich wake sources, and ample program memory. The MCU wakes from sleep via CTMU proximity detection, INT pin interrupt, RTCC alarm, or WDT timeout, then transmits over UART/SPI/I2C to a companion radio such as LoRa, BLE, or Wi-Fi. The 64 KB Flash fits full TCP/IP, MQTT, or LoRaWAN stacks with room for application logic. The wide Vdd range (1.8V-5.5V) lets the node run from single AA, CR2032, or USB rails without DC-DC converters.
Recommended
Automotive Body Control Module
While not AEC-Q100 qualified, the PIC18F66K22T-I/PTRSL's industrial -40C to +85C grade (and the extended -40C to +125C -E variant) finds use in non-critical automotive subsystems such as cabin lighting, mirror adjusters, or aftermarket accessories. The CTMU enables capacitive touch buttons on door panels and steering wheel controls, while PWM modules drive LED lighting strips with smooth dimming. The 54 I/O pins support numerous switches and relays in body control modules, and the 12-bit ADC reads position sensors and current shunts. For AEC-Q100 qualified alternatives, designers should evaluate PIC18F46K22-I/PT or PIC18F47K42-I/PT automotive variants.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66K22T-I/PTRSL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66K22-I/PTRSL | PIC18F66K22T-I/PT | PIC18F65K22T-I/PTRSL | PIC18F67K22-I/PT | PIC18F66K22-E/PT |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 128 KB | 64 KB |
| Data RAM | 4 KB | 4 KB | 4 KB | 4 KB | 8 KB | 4 KB |
| Maximum Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C (Extended) |
| CTMU (Touch) | Yes | Yes | Yes | Yes | Yes | Yes |
| Supply Voltage Range | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V |
Key Differentiators
- Highest I/O count in 64-pin K22 family (vs PIC18F65K22T-I/PTRSL)
- Easy upgrade path to higher memory variants (vs PIC18F67K22-I/PT)
- Tape-and-reel factory packaging (vs PIC18F66K22-I/PTRSL)
- Extended temperature option available in same package (vs PIC18F66K22-E/PT)
Design Notes
Estimated: the PIC18F66K22T-I/PTRSL draws approximately 9 mA active at 64 MHz / 5V and under 100 nA in sleep mode per Microchip XLP datasheet. Place a 100 nF decoupling capacitor as close as possible to every Vdd pin (5 pairs of Vdd/Vss on the 64-pin TQFP), plus a single 10 uF bulk capacitor on the main Vdd rail. For battery-powered designs, use Sleep mode aggressively and wake via CTMU touch, RTCC alarm, or INT pin to achieve multi-year battery life.
Route the ICSP clock/data pins (PGC/PGD, also RB6/RB7) as a short, parallel pair to the programming/debug header with no series resistors and minimal stubs. Keep the trace length under 50 mm and avoid running them near switching power or high-frequency signals. Place the ICD 2-wire header on the board edge for easy access during development. Decoupling capacitor ground pads must connect directly to the Vss via adjacent pin, not through the ground plane.
Do not confuse the PIC18F66K22 (64-pin, K22 series, 1.8-5.5V) with the PIC18F66J55 (64-pin, J series, 3.0-3.6V only) - the J series is NOT a drop-in upgrade because of different voltage range. Also verify the PIC18F65K22 has 50 I/O vs the PIC18F66K22's 54 I/O; pinout differs on PORTG/RA pins. Always confirm oscillator configuration bits against your chosen Vdd - some PLL modes require Vdd above 2.5V.
Compliance Information
RoHS and lead-free per Microchip product page; K22 family is generally halogen-free per Microchip's environmental certification - confirm specific lot documentation with the manufacturer for halogen-free claims.
