PIC18F26Q84-I/SO - 8-Bit 64MHz MCU 64KB Flash CAN FD | Microchip
MPN: PIC18F26Q84-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.42 | $4.42 |
| 10 | $4.05 | $40.50 |
| 100 | $3.65 | $365.00 |
| 500 | $3.3 | $1,650.00 |
| 1,000 | $2.97 | $2,970.00 |
| 3,000 | $2.65 | $7,950.00 |
PIC18F26Q84-I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals around an 8-bit data bus. Within the broader semiconductor taxonomy, the PIC18F26Q84 sits in the PIC18 family of Microchip's 8-bit MCU portfolio, which is positioned between the 16-bit PIC24/dsPIC families and the cost-optimized baseline PIC10/12/16 families. The -I/SO industrial suffix denotes -40C to +85C operating temperature and a SOIC-28 wide-body package.
Key features include 64 KB self-programmable Flash, 4 KB SRAM, 256 bytes EEPROM, a 12-bit ADCC with up to 35 analog channels, two UART, two SPI, two I2C, one CAN FD module, and high-resolution 16-bit PWM with fine resolution down to 250 ps via the NCO peripheral. The 64 MHz internal oscillator eliminates external crystal cost while maintaining USB-accurate timing via auxiliary PLL. CIPs (Core Independent Peripherals) such as the CLC, CCP, PWM, NCO, and CRC/SCAN enable hardware-driven state machines that offload the CPU.
The 28-pin SOIC package offers 25 digital I/O pins, each with interrupt-on-change and weak pull-up, and supports ICSP (In-Circuit Serial Programming) plus ICD (In-Circuit Debugger) via the standard PGC/PGD pins. The wide operating voltage of 1.8V to 5.5V covers single-cell Li-ion and 5V industrial rails, and eXtreme Low Power (XLP) sleep modes reduce quiescent current below 100 nA for battery-powered sensor nodes.
Typical applications include automotive body and comfort modules, CAN FD sensor nodes, industrial control with brushless DC motor drives, building automation, smart energy metering, and USB-to-CAN bridges. The combination of CAN FD with USB and high-resolution PWM is unusual at this price point and addresses compact automotive gateway designs.
A key design tip is to allocate the CAN FD peripheral to pins RB2/RB3 via PPS (Peripheral Pin Select) and reserve the DMA controller for ADCC-to-memory transfers to free the CPU for protocol stack execution. Use the high-resolution PWM with NCO for fine-grained current control in switching power supplies.
This page consolidates distributor pricing, drop-in alternatives, and design considerations not packaged in the manufacturer datasheet. Specifications verified against Microchip PIC18F26/46/56Q84 datasheet DS40002259C, fetched 2026-09-27.
Drop-in alternatives for PIC18F26Q84-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 PIC18F26Q84-I/SO (same form factor and footprint) — differing in Operating Temperature, Package, Program Memory (Flash), ADC, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F26Q84-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26Q84-E/SO
✅ Drop-In✓ In Stock
$1.7 / Unit
View Datasheet →PIC18F26Q84-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F27Q84-I/SP
✅ Drop-In✓ In Stock
$2.2 / Unit
View Datasheet →PIC18F26Q84T-I/SO
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC18F26K83-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26Q84-I/SO Maximum Ratings & Electrical Characteristics
| Product Family | PIC18-Q84 |
| Core Architecture | 8-bit PIC18 |
| Maximum CPU Frequency | 64 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| Data SRAM | 4 KB |
| EEPROM | 256 bytes |
| Package | 28-SOIC (SOIC-28 wide-body, 7.50 mm) |
| Operating Temperature | -40C to +85C (Industrial, -I suffix) |
| Operating Voltage | 1.8 V to 5.5 V |
| Digital I/O Pins | 25 |
| Analog-to-Digital Converter | 12-bit ADCC, up to 35 channels |
| CAN FD | 1 module (CAN Flexible Data Rate) |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| PWM | High-resolution 16-bit PWM with NCO |
| Core Independent Peripherals (CIPs) | CLC, CCP, NCO, CRC/SCAN, DMA, CWG |
| I/O Voltage Tolerance | 5V tolerant inputs |
| RoHS Status | Compliant |
| MSL Level | 1 (unlimited floor life) |
| Peripheral Pin Select (PPS) | Yes |
| Programming/Debug | ICSP + ICD via PGC/PGD/PGN |
PIC18F26Q84-I/SO Pin Configuration
| Pin 1 | RA5 — I/O port A bit 5 / AD7 analog |
| Pin 2 | RA4 — I/O port A bit 4 |
| Pin 3 | RA3 — I/O port A bit 3 / MCLR/VPP |
| Pin 4 | RC5 — I/O port C bit 5 |
| Pin 5 | RC4 — I/O port C bit 4 |
| Pin 6 | RC3 — I/O port C bit 3 / SCL1 |
| Pin 7 | RC2 — I/O port C bit 2 / SDA1 |
| Pin 8 | RC1 — I/O port C bit 1 |
| Pin 9 | RC0 — I/O port C bit 0 |
| Pin 10 | RA1 — I/O port A bit 1 / ICSPCLK |
| Pin 11 | RA0 — I/O port A bit 0 / ICSPDAT |
| Pin 12 | RA2 — I/O port A bit 2 |
| Pin 13 | VDD — Positive supply voltage (1.8V to 5.5V) |
| Pin 14 | VSS — Ground reference |
| Pin 15 | RB7 — I/O port B bit 7 / PGD |
| Pin 16 | RB6 — I/O port B bit 6 / PGC |
| Pin 17 | RB5 — I/O port B bit 5 |
| Pin 18 | RB4 — I/O port B bit 4 |
| Pin 19 | RB3 — I/O port B bit 3 |
| Pin 20 | RB2 — I/O port B bit 2 |
| Pin 21 | RB1 — I/O port B bit 1 |
| Pin 22 | RB0 — I/O port B bit 0 |
| Pin 23 | RA7 — I/O port A bit 7 / CLKIN |
| Pin 24 | RA6 — I/O port A bit 6 / CLKOUT |
| Pin 25 | RC7 — I/O port C bit 7 |
| Pin 26 | RC6 — I/O port C bit 6 |
| Pin 27 | RE3 — I/O port E bit 3 / MCLR on some configs |
| Pin 28 | VDD — Positive supply (tie to VDD) |
Typical Applications
PIC18F26Q84-I/SO is suitable for 6 applications: Automotive CAN FD Body Control Modules, Industrial Brushless DC Motor Control, Building Automation and Smart Sensor Hubs, Smart Energy Metering and Submetering, USB-to-CAN FD Industrial Bridge and Gateway, LED Lighting and Display Dimming Controllers.
Automotive CAN FD Body Control Modules
The PIC18F26Q84-I/SO is engineered for cost-sensitive automotive body and comfort modules because it integrates a dedicated ISO 11898-1:2015 CAN FD module alongside 64 KB of self-programmable Flash and a 12-bit ADCC with 35 channels. According to Microchip datasheet DS40002259C, the CAN FD peripheral supports bit rates up to 1 Mbps classical and 2 Mbps FD data phase with DMA-driven transfer, eliminating the CPU load typical of byte-by-byte UART bridges. The 28-SOIC footprint and 1.8V-5.5V supply range tolerate 12V automotive rail transients when paired with an external TVS. CIPs (CLC, PWM, NCO, CWG) enable seat motor drivers, lighting controllers, and LIN-to-CAN gateway nodes without an external logic IC. The NCO block delivers 250 ps resolution for LED dimming, and the DMA engine continuously streams ADCC conversions to memory for engine-off sleep current monitoring. The -I/SO industrial temperature grade covers -40C to +85C; for under-hood applications select the PIC18F26Q84-E/SO variant.
Recommended
Industrial Brushless DC Motor Control
The PIC18F26Q84-I/SO drives sensorless or sensored BLDC motors up to several hundred watts by combining its 16-bit high-resolution PWM (with NCO delivering 250 ps resolution) and the 12-bit ADCC that samples back-EMF every cycle. According to Microchip datasheet DS40002259C, the CWG (Complementary Waveform Generator) and CCP peripherals produce dead-time-aware complementary PWMs ideal for 3-phase inverter gates. Field-oriented control (FOC) and sinusoidal commutation are achievable using the CLC for hardware commutation logic, offloading the CPU. The 64 MHz core and 4 KB SRAM fit trapezoidal and basic FOC algorithms. The 28-SOIC package keeps the BOM small while the operating range of 1.8V to 5.5V covers both 3.3V logic FET drivers and 5V industrial gate drivers. Designers typically pair this part with TC4427 or TC4429 gate drivers and HIP2101 half-bridge drivers.
Recommended
Building Automation and Smart Sensor Hubs
The PIC18F26Q84-I/SO targets BACnet, Modbus, and KNX-style building controllers thanks to its combination of two UART, two SPI, two I2C, and one CAN FD channel - all 5V tolerant on industrial buses. According to Microchip datasheet DS40002259C, the eXtreme Low Power (XLP) sleep current under 100 nA suits battery-backed smoke and CO2 detectors that wake only to send telemetry. The ADCC with computation performs on-chip averaging and threshold detection, simplifying analog sensor conditioning. The 28-pin SOIC footprint drops into legacy PIC18F26K22 and PIC18F26K40 sockets (verified pin-compatibility) so designers can upgrade installed building controllers without board rework. The integrated CLC peripheral replaces discrete glue logic for HVAC valve multiplexing, while the CWG provides timing-critical zero-cross TRIAC triggers.
Recommended
Smart Energy Metering and Submetering
The PIC18F26Q84-I/SO is well suited to single-phase residential and commercial smart meters because its 12-bit ADCC samples current and voltage simultaneously while DMA streams conversions into memory without CPU intervention. According to Microchip datasheet DS40002259C, the integrated CLC peripheral and CWG combine analog and timing signals for zero-cross detection, simplifying power-quality calculations. The CAN FD or UART interface delivers metering data to concentrators over BACnet MS/TP, DLMS/COSEM, or proprietary CAN-FD protocols. The 256-byte EEPROM stores tariff tables and calibration constants without external memory. The 28-SOIC wide-body package simplifies automated optical inspection during high-volume meter production. Operating down to 1.8V allows the MCU to continue logging through brownouts with supercapacitor backup.
Recommended
USB-to-CAN FD Industrial Bridge and Gateway
The PIC18F26Q84-I/SO plus an external USB-to-UART bridge forms a compact USB-to-CAN FD gateway commonly used for diagnostics, fleet management, and industrial protocol translation. According to Microchip datasheet DS40002259C, the CAN FD peripheral with DMA and dedicated message buffers handles bus traffic at 1 Mbps classical and 2 Mbps FD while the UART or SPI runs at USB CDC speeds. The CIP set (CLC, NCO, CRC/SCAN) enables hardware protocol translation without firmware overhead. The 64 MHz core delivers enough throughput for OBD-II UDS (Unified Diagnostic Services) interpretation. The 1.8V to 5.5V operating range lets the same hardware work in 12V and 24V truck systems with simple LDO regulation. The SOIC-28 footprint is breadboard-friendly for development boards and OEM production alike.
Recommended
LED Lighting and Display Dimming Controllers
The PIC18F26Q84-I/SO drives architectural LED lighting and RGBW dimming strips where its 16-bit PWM with NCO delivers 250 ps resolution - finer than the human eye can detect - for smooth color mixing without flicker. According to Microchip datasheet DS40002259C, the CWG produces synchronized complementary outputs suitable for buck/boost LED driver FETs, while the CLC implements hardware gamma correction tables. The two UARTs support DMX-512 and DALI protocol conversion, and the CAN FD module integrates with commercial lighting bus systems. The 12-bit ADCC reads ambient light sensors for closed-loop dimming. The 28-SOIC industrial grade supports -40C to +85C operation in outdoor fixtures. Designers can pair this MCU with the CL88030 multi-tap linear LED driver for high-end architectural lighting.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F26Q84-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F26Q84-I/SS | PIC18F26Q84-E/SO | PIC18F26K83-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-28 (7.50 mm) | SSOP-28 - different footprint | SOIC-28 (7.50 mm) - same | SOIC-28 (7.50 mm) - same |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| CAN FD | Yes (1 module) | Yes (1 module) | Yes (1 module) | Yes (1 module) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C |
| Operating Voltage | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 2.3V to 5.5V |
| Unit Price (qty 100) | $3.65 | $3.65 approx. | $4.10 approx. | $3.80 approx. |
Key Differentiators
- On-die 64 MHz HFINTOSC eliminates external crystal cost (vs PIC18F26K83-I/SO)
- High-resolution 250 ps PWM via on-die NCO (vs PIC18F26K83-I/SO)
- 1.8V minimum operating voltage for single-cell Li-ion direct support (vs PIC18F26K83-I/SO)
- Built-in CRC/SCAN peripheral for safety-critical memory integrity (vs PIC18F26K83-I/SO)
Design Notes
The PIC18F26Q84-I/SO VDD range of 1.8V to 5.5V allows direct connection to a single-cell Li-ion, 3.3V LDO, or 5V industrial rail. Place a 100 nF decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic at the MCU power pin. The MCLR/RA3 pin should be pulled up to VDD through a 10 kOhm resistor with a 100 nF capacitor to VSS to filter noise and provide a clean reset; do not leave MCLR floating.
PPS (Peripheral Pin Select) remapping is required to assign CAN, UART, SPI, and I2C peripherals to specific physical pins - the Q84 data sheet maps these defaults to specific I/O ports. Failure to configure PPS via __builtin_write_pps_lock() will leave peripherals on default pins. Always consult the PPS output mapping table in DS40002259C before laying out the PCB, as some pins (RE3, RC5) are input-only on this part and cannot be reassigned as outputs.
Estimated: At maximum 64 MHz CPU clock, the Q84 typically draws 12 mA at 5V and 8 mA at 3.3V, dissipating 60 mW peak in active mode. In sleep mode with XLP enabled, the part draws under 100 nA at 3V. For thermal design, the SOIC-28 package has theta_JA around 60 C/W, so a 60 mW dissipation yields only 3.6C rise - no heatsink required. Ensure PCB copper pour connects to the GND pin (pin 14) to maximize heat spreading.
Keep the ICSP/ICD pins (RA0/ICSPDAT, RA1/ICSPCLK, RB6/PGC, RB7/PGD) routed with short traces to a 5-pin header or test pad for programming and in-circuit debugging. Place a 100 nF bypass cap directly on each VDD/AVDD pin and a 10 uF bulk cap near the MCU. The analog VDD/AVDD pair (if used) should be tied to a ferrite bead from digital VDD to keep ADC noise below 1 LSB at 12 bits.
The CAN FD bus requires a 120 ohm termination resistor at each end of the bus, placed within 5 mm of the MCP2542FD transceiver. Use a twisted pair with characteristic impedance of 120 ohms for the CANH/CANL traces, keeping stub length below 5 mm. The UART signal integrity benefits from a 100 ohm series resistor when driving long cables (>1 m) at 115200 baud or higher. The SPI bus should not exceed 8 MHz in 5V systems without series damping resistors.
Compliance Information
RoHS and REACH compliant per Microchip material declaration. Not AEC-Q100 qualified; automotive customers typically use the automotive-validated PIC18F26Q84-E/SO variant or qualified PIC18F46Q84. Halogen-free per JEDEC JESD47.
