PIC18F6622-I/PT - 8-Bit 40MHz 64KB Flash MCU, 70 I/O, TQFP-64 | Microchip
MPN: PIC18F6622-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.2 | $8.20 |
| 10 | $7.39 | $73.90 |
| 100 | $6.55 | $655.00 |
| 500 | $5.95 | $2,975.00 |
| 1,000 | $5.62 | $5,620.00 |
PIC18F6622-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU, non-volatile program memory (flash), volatile data memory (RAM), and peripheral set on one die. The PIC18F family sits in Microchip's enhanced mid-range hierarchy: PIC10/12/16 baseline -> PIC18 enhanced 8-bit -> PIC24/dsPIC 16-bit -> PIC32 32-bit. Within power management taxonomy, MCUs are classified as embedded controllers inside the broader semiconductor IC family. PIC18F6622-I/PT specifically integrates nanoWatt power-management modes, making it ideal for battery-powered or energy-harvesting designs where idle current dominates.
Key features include 70 I/O pins, 12 channels of 10-bit ADC, two CCP modules, one Enhanced CCP (ECCP), two MSSP (I2C/SPI), two Enhanced USART (LIN-capable), two analog comparators, and a 16-bit timer. It also provides a parallel slave port for external bus expansion and an ICD-friendly in-circuit debug interface. The 64-pin TQFP exposes the full peripheral set with no multiplexing compromises for industrial and consumer designs.
Architecturally, the PIC18F6622-I/PT uses a Harvard RISC core with 16-bit instructions, 8-bit data path, hardware multiply, and a 31-level deep hardware stack. The nanoWatt technology incorporates run, idle, and sleep modes with on-the-fly oscillator switching, supporting currents in the microamp range during sleep with wake-up on interrupt, watchdog, or external events. The flash program memory is self-programmable under firmware control, enabling in-field firmware updates without external programmers.
Typical applications include industrial control panels, HVAC and building automation gateways, automotive LIN sub-net nodes, sensor hubs with multi-serial bridging, USB-to-UART bridges using the parallel slave port, and consumer appliances requiring high pin count with low sleep current. The large RAM and dual synchronous/dual asynchronous serial ports make it well suited to multi-protocol bridging firmware.
When designing with this device, ensure decoupling with 100 nF ceramic capacitors close to each VDD/VSS pair, keep analog and digital grounds separated at the ADC reference, and route the 40 MHz crystal traces short and symmetric for EMI compliance. The -I temperature grade (-40C to +85C) covers most commercial and industrial environments, while -E grade parts serve extended-temperature applications.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F6622-I/PT — 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 PIC18F6622-I/PT (same form factor and footprint) — differing in Package, Core Architecture, Timers, Operating Temperature, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F6722-I/PT
✅ Drop-In✓ In Stock
$5.32 / Unit
View Datasheet →PIC18F6622-E/PT
✅ Drop-In✓ In Stock
$6.71 / Unit
View Datasheet →PIC18F6527-I/PT
✅ Drop-In✓ In Stock
$5.62 / Unit
View Datasheet →PIC18F6627-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.42 / Unit
View Datasheet →PIC18F6680-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F6622-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 Enhanced 8-bit RISC |
| Program Memory (Flash) | 64 KB (32K x 16) |
| RAM | 4 KB |
| Data EEPROM | 1 KB |
| Maximum CPU Frequency | 40 MHz |
| Data Bus Width | 8-bit |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 70 |
| ADC | 10-bit, 12 channels |
| Timers | 16-bit timers and 8-bit timers (multiple) |
| Communication Interfaces | 2x MSSP (I2C/SPI), 2x EUSART (LIN-capable) |
| CCP / ECCP Modules | 2x CCP + 1x ECCP |
| Analog Comparators | 2 |
| Package | TQFP-64 (PT), 10x10 mm |
| Operating Temperature (I grade) | -40 C to +85 C |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
PIC18F6622-I/PT Pin Configuration
| Pin 1 | RG0 — General-purpose I/O / CCP3 |
| Pin 2 | RG1 — General-purpose I/O / TX2 |
| Pin 3 | RG2 — General-purpose I/O / RX2 |
| Pin 4 | RG3 — General-purpose I/O / CCP4 |
| Pin 5 | RG4 — General-purpose I/O / CCP5 |
| Pin 6 | MCLR — Master clear reset input (active low) |
| Pin 7 | OSC1 — Crystal/oscillator input |
| Pin 8 | OSC2 — Crystal/oscillator output |
| Pin 9 | RA0 — Analog input AN0 / CVref |
| Pin 10 | RA1 — Analog input AN1 |
| Pin 11 | RA2 — Analog input AN2 / Vref- |
| Pin 12 | RA3 — Analog input AN3 / Vref+ |
| Pin 13 | RA4 — Digital I/O / T0CKI |
| Pin 14 | RA5 — Digital I/O / AN4 / HLVDIN |
| Pin 15 | RA6 — Digital I/O / OSC1 alt |
| Pin 16 | RA7 — Digital I/O / OSC2 alt |
| Pin 17 | VSS — Ground |
| Pin 18 | VDD — Positive supply voltage |
| Pin 19 | RB0 — Digital I/O / INT0 / AN12 |
| Pin 20 | RB1 — Digital I/O / INT1 / AN10 |
| Pin 21 | RB2 — Digital I/O / INT2 / AN8 |
| Pin 22 | RB3 — Digital I/O / INT3 / AN9 / CCP2 |
| Pin 23 | RB4 — Digital I/O / AN11 |
| Pin 24 | RB5 — Digital I/O / AN13 / CCP3 |
| Pin 25 | RB6 — Digital I/O / PGC (ICD clock) |
| Pin 26 | RB7 — Digital I/O / PGD (ICD data) |
| Pin 27 | RC0 — Digital I/O / T1OSO / T13CKI |
| Pin 28 | RC1 — Digital I/O / T1OSI / CCP2 |
| Pin 29 | RC2 — Digital I/O / CCP1 |
| Pin 30 | RC3 — Digital I/O / SCL1 / SCK1 |
| Pin 31 | RC4 — Digital I/O / SDA1 / SDI1 |
| Pin 32 | RC5 — Digital I/O / SDO1 |
| Pin 33 | RC6 — Digital I/O / TX1 / CK1 |
| Pin 34 | RC7 — Digital I/O / RX1 / DT1 |
| Pin 35 | VSS — Ground |
| Pin 36 | VDD — Positive supply voltage |
| Pin 37 | RD0 — Digital I/O / PSP0 |
| Pin 38 | RD1 — Digital I/O / PSP1 |
| Pin 39 | RD2 — Digital I/O / PSP2 |
| Pin 40 | RD3 — Digital I/O / PSP3 |
| Pin 41 | RD4 — Digital I/O / PSP4 / SDO2 |
| Pin 42 | RD5 — Digital I/O / PSP5 / SDI2 / SDA2 |
| Pin 43 | RD6 — Digital I/O / PSP6 / SCK2 / SCL2 |
| Pin 44 | RD7 — Digital I/O / PSP7 / SS2 |
| Pin 45 | VSS — Ground |
| Pin 46 | VDD — Positive supply voltage |
| Pin 47 | RE0 — Digital I/O / AN5 / RD |
| Pin 48 | RE1 — Digital I/O / AN6 / WR |
| Pin 49 | RE2 — Digital I/O / AN7 / CS |
| Pin 50 | RE3 — Digital I/O / RD (alt) |
| Pin 51 | RE4 — Digital I/O |
| Pin 52 | RE5 — Digital I/O |
| Pin 53 | RE6 — Digital I/O |
| Pin 54 | RE7 — Digital I/O / CCP2 |
| Pin 55 | RF0 — Digital I/O / AN16 |
| Pin 56 | RF1 — Digital I/O / AN6 / C2OUT |
| Pin 57 | RF2 — Digital I/O / AN7 / C1OUT |
| Pin 58 | RF3 — Digital I/O / AN8 |
| Pin 59 | RF4 — Digital I/O / AN9 |
| Pin 60 | RF5 — Digital I/O / AN10 / C2IN- |
| Pin 61 | RF6 — Digital I/O / AN11 / C1IN- |
| Pin 62 | RF7 — Digital I/O / AN5 / SS1 |
| Pin 63 | VSS — Ground |
| Pin 64 | VDD — Positive supply voltage |
Typical Applications
PIC18F6622-I/PT is suitable for 6 applications: Industrial Control Panels, HVAC and Building Automation Gateways, Automotive LIN Sub-Net Nodes, USB-to-UART Bridge with Parallel Slave Port, Multi-Sensor Hubs with Protocol Bridging, Consumer Appliance Controllers.
Industrial Control Panels
The PIC18F6622-I/PT is well suited to industrial control panels where 70 I/O pins drive keypad scanning, LED matrix displays, relay banks, and multiple sensor inputs. The 40 MHz CPU and 64 KB flash comfortably run Modbus RTU masters, PID control loops, and human-machine interface (HMI) state machines. Two EUSARTs allow simultaneous RS-485 master/slave bridging, while 12 ADC channels sample analog sensors without external muxes. The -40C to +85C industrial temperature range covers factory floor environments, and nanoWatt sleep modes cut power between operator interactions.
Recommended
HVAC and Building Automation Gateways
The PIC18F6622-I/PT serves as a multi-protocol gateway in HVAC and building automation, bridging BACnet MS-TP, Modbus, and LIN sub-nets through its two EUSARTs and two MSSP peripherals. The 4 KB RAM buffers telemetry packets while 64 KB flash stores protocol stacks, scheduling logic, and OTA bootloader. nanoWatt sleep modes with interrupt wake-up let the gateway idle between sensor polls, cutting power consumption below 10 uA in standby. The wide 2.0-5.5 V VDD range accepts 24V-derived rails after regulation, and the 10-bit ADC reads thermistor/resistive sensor inputs directly.
Recommended
Automotive LIN Sub-Net Nodes
The PIC18F6622-I/PT integrates LIN-capable Enhanced USART peripherals, making it suitable for automotive body-electronics LIN sub-net nodes controlling window lifters, mirror adjusters, seat controllers, and ambient lighting. The 70 I/O pins drive H-bridge drivers and LED PWM channels through the ECCP module, while the 12-channel 10-bit ADC reads position feedback and current sense. Per the Microchip datasheet, the LIN peripheral supports auto-baud detection and full LIN 1.3/2.0/2.1 compliance. Note that the I-grade temperature rating (-40C to +85C) suits cabin modules; under-hood applications should select the E-grade variant.
Recommended
USB-to-UART Bridge with Parallel Slave Port
The PIC18F6622-I/PT exposes a parallel slave port (PSP) that, combined with an external USB-to-parallel chip like the MCP2210, creates a high-throughput USB-to-UART/I2C/SPI bridge for legacy industrial equipment. The 40 MHz CPU handles USB enumeration and protocol translation without bottlenecks, while 64 KB flash stores HID or CDC class descriptors plus custom command sets. The dual EUSART supports two independent UART channels simultaneously, useful for debugging two serial buses through a single USB port. The nanoWatt sleep mode enables USB suspend compliance with <2.5 mA device current.
Recommended
Multi-Sensor Hubs with Protocol Bridging
The PIC18F6622-I/PT excels as a multi-sensor hub reading I2C sensors through MSSP, SPI devices through the second MSSP, and forwarding data over UART or back to a host MCU. The 4 KB RAM caches sensor fusion state, while the 12-channel 10-bit ADC monitors analog sensors in parallel. The 40 MHz CPU runs sensor fusion algorithms at 100 Hz while maintaining serial responsiveness. nanoWatt sleep modes with wake-on-interrupt let the hub idle between sensor reads, extending battery life in wireless sensor nodes.
Recommended
Consumer Appliance Controllers
The PIC18F6622-I/PT drives consumer appliances such as washing machines, dishwashers, and coffee machines where 70 I/O pins interface with keypads, displays, motor drivers, and water level sensors. The ECCP module generates PWM for motor speed control, while the 12-channel ADC monitors temperature, turbidity, and load weight. The 64 KB flash stores appliance firmware with multi-language UI strings, and 4 KB RAM buffers display refresh and motor state. The wide 2.0-5.5 V VDD accepts regulated supplies from universal mains adapters, and nanoWatt modes drop standby power below energy-star limits.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F6622-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F6722-I/PT | PIC18F6622-E/PT | PIC18F6527-I/PT | PIC18F6627-I/PT | PIC18F6680-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (PT) 10x10 mm | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same |
| Program Flash | 64 KB | 128 KB | 64 KB | 48 KB | 96 KB | 64 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum CPU Frequency | 40 MHz | 40 MHz | 25 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Temperature Grade | -40C to +85C (I) | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
| I/O Pins | 70 | 70 | 70 | 70 | 70 | 70 |
| CAN Module | No | No | No | No | No | Yes |
| Price (qty-1, USD) | $8.20 | $9.50 | $8.95 | $7.40 | $8.80 | $9.10 |
Key Differentiators
- Dual MSSP + dual EUSART (LIN-capable) for four serial ports (vs PIC18F6527-I/PT)
- Larger flash headroom at the same price tier (vs PIC18F6527-I/PT)
- Industrial temperature grade with extended flash variants available (vs PIC18F6722-I/PT)
Design Notes
The PIC18F6622-I/PT operates from 2.0 V to 5.5 V at up to 40 MHz. Place a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pair (pins 18/17, 36/35, 46/45, 64/63); add a bulk 10 uF tantalum or ceramic near the IC. For battery-powered designs, the nanoWatt sleep mode drops current below 1 uA typical with RTCC running - per the Microchip datasheet, use the on-the-fly oscillator switch to wake on interrupt without external circuitry.
Route the 40 MHz crystal traces (OSC1/OSC2, pins 7-8) within 5 mm of the MCU, symmetric and short with a ground guard ring. Keep analog traces (RA0-RA7, RF0-RF7, RE0-RE7) away from digital switching signals to minimize ADC crosstalk; if using the 12-channel 10-bit ADC for sub-LSB precision, place a 100 nF cap on Vref+ and use a separate analog ground island joined at one point. The PGC/PGD ICD pins (RB6/RB7) must be accessible for in-circuit debugging - do not place series resistors above 100 ohm.
Do not drive MCLR (pin 6) directly to VDD without a 10 kohm pull-up; a noisy reset line causes spurious restarts. When using the parallel slave port (RD0-RD7, RE0-RE2), the PSP control lines must be configured as digital I/O - leaving them as analog inputs disables PSP operation. The I grade temperature rating (-40C to +85C) is industrial range; do not specify this part for under-hood automotive without the E grade variant. Always configure unused I/O as outputs low to minimize sleep current.
Compliance Information
RoHS and REACH compliant per Microchip product page; lead-free and halogen-free per datasheet. Not AEC-Q100 qualified; for automotive applications requiring AEC-Q100, consult Microchip for the PIC18F6622-I/PT automotive-grade equivalent. The I grade temperature range (-40C to +85C) covers industrial environments; select E grade parts for extended-temperature designs.