PIC18F26Q84-I/SP - 8-bit MCU 64MHz 64KB Flash CAN FD | Microchip
MPN: PIC18F26Q84-I/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.1 | $3.10 |
| 10 | $2.78 | $27.80 |
| 100 | $2.45 | $245.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.95 | $1,950.00 |
PIC18F26Q84-I/SP Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data bus CPU, on-chip program memory (Flash), data memory (RAM), and a configurable set of peripherals. MCUs sit inside the broader hierarchy of embedded computing devices: microcontroller -> embedded processor -> semiconductor IC. The PIC18 architecture is Microchip's high-end 8-bit family, offering enhanced instruction set, larger memory maps and richer peripherals than the PIC16 family, while remaining easier to program and debug than 32-bit ARM Cortex-M parts.
Key features of the PIC18F26Q84-I/SP include operation from 1.8 V to 5.5 V, 25 digital I/O pins, hardware CAN FD controller, multiple UART/SPI/I2C interfaces, 12-bit ADC with computation, configurable logic cells (CLC), Complementary Waveform Generator (CWG), and zero-cross detect. The 64 KB self-programmable Flash supports in-application programming, while the 1 KB EEPROM provides non-volatile data storage. The integrated 32 MHz high-speed oscillator and 64 MHz PLL deliver 16 MIPS performance at 64 MHz.
The architecture combines a RISC-style Harvard CPU with CIP blocks such as CLC, PWM, signal measurement timers, and CWG that interconnect via a programmable fabric, allowing hardware-level state machines without CPU intervention. This reduces firmware complexity and improves timing determinism for motor control, power conversion, and sensor signal chains.
Typical applications include automotive body and sensor networks (CAN FD nodes), industrial sensor hubs, building automation, lighting controllers, smart agriculture nodes, and small appliance motor control. Wide voltage range (1.8 V to 5.5 V) and CAN FD make it especially suitable for distributed industrial networks.
Design consideration: ensure CAN bus termination (120 ohm at each end), TVS protection, and proper dominant/recessive recessive bit timing. The 28-SPDIP footprint eases prototype rework and breadboarding, but for volume production migrate to the SOIC or SSOP variants of the same die.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and application guidance not found in the manufacturer datasheet alone, optimizing it for engineering decision-making and AI-cited knowledge retrieval.
Drop-in alternatives for PIC18F26Q84-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 PIC18F26Q84-I/SP (same form factor and footprint) — differing in Operating Temperature, Package, ADC, MSL Level, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F26Q84-I/SO
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC18F26Q84-E/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F27Q84-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26Q84-E/SO
✅ Drop-In✓ In Stock
$1.7 / Unit
View Datasheet →PIC18F26Q10-I/SS
✅ Drop-In✓ In Stock
$0.92 / Unit
View Datasheet →PIC18F26Q43-I/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC18F26Q84-I/SP Maximum Ratings & Electrical Characteristics
| Product Family | PIC18-Q84 |
| Core Architecture | PIC 8-bit RISC |
| CPU Speed | 64 MHz (16 MIPS) |
| Program Memory (Flash) | 64 KB (64K x 8) |
| Data Memory (RAM) | 4 KB |
| EEPROM | 1 KB |
| Supply Voltage | 1.8 V to 5.5 V |
| I/O Pins | 25 |
| Package | 28-SPDIP (SP) |
| Mounting Type | Through-Hole |
| CAN FD | Yes (1 module) |
| ADC | 12-bit ADC with Computation |
| Operating Temperature | -40C to +85C (Industrial) |
| Temperature Grade | Industrial |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18F26Q84-I/SP Pin Configuration
| Pin 1 | RA0/AN0/C1IN0+/C2IN0+/DAC1OUT/CLCIN0/INT0 — GPIO RA0 / Analog Ch0 / DAC1 out / INT0 |
| Pin 2 | RA1/AN1/C1IN1-/C2IN1-/DAC1REF+/CLCIN1 — GPIO RA1 / Analog Ch1 / DAC1 ref+ |
| Pin 3 | RA2/AN2/C1IN2-/C2IN2-/DAC1REF-/CLCIN2 — GPIO RA2 / Analog Ch2 / DAC1 ref- |
| Pin 4 | RA3/AN3/C1IN3-/C2IN3-/CLCIN3 — GPIO RA3 / Analog Ch3 |
| Pin 5 | RA4/AN4/C1OUT/T0CKI/CLCIN4 — GPIO RA4 / Analog Ch4 / Timer0 clock |
| Pin 6 | RA5/AN5/C2OUT1/T1CKI/CLCIN5 — GPIO RA5 / Analog Ch5 / Timer1 clock |
| Pin 7 | RA6/AN6 — GPIO RA6 / Analog Ch6 |
| Pin 8 | RA7/AN7 — GPIO RA7 / Analog Ch7 |
| Pin 9 | VSS — Ground |
| Pin 10 | VDD — Positive supply voltage |
| Pin 11 | RB0/AN8/C2IN4+/SRI/INT1 — GPIO RB0 / Analog Ch8 / INT1 |
| Pin 12 | RB1/AN9/C1IN4+/C2IN4-/INT2 — GPIO RB1 / Analog Ch9 / INT2 |
| Pin 13 | RB2/AN10/C1IN3+/CANRX — GPIO RB2 / Analog Ch10 / CAN RX |
| Pin 14 | RB3/AN11/C1IN2+/CANTX — GPIO RB3 / Analog Ch11 / CAN TX |
| Pin 15 | RB4/AN12/C2IN3+/SDA1 — GPIO RB4 / Analog Ch12 / I2C1 SDA |
| Pin 16 | RB5/AN13/C2IN2+/SCL1 — GPIO RB5 / Analog Ch13 / I2C1 SCL |
| Pin 17 | RB6/ICSPCLK — GPIO RB6 / ICSP clock |
| Pin 18 | RB7/ICSPDAT — GPIO RB7 / ICSP data |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RC0/SOSCO — GPIO RC0 / Secondary oscillator out |
| Pin 22 | RC1/SOSCI — GPIO RC1 / Secondary oscillator in |
| Pin 23 | RC2/AN14 — GPIO RC2 / Analog Ch14 |
| Pin 24 | RC3/AN15/SCL2 — GPIO RC3 / Analog Ch15 / I2C2 SCL |
| Pin 25 | RC4/AN16/SDA2 — GPIO RC4 / Analog Ch16 / I2C2 SDA |
| Pin 26 | RC5/AN17 — GPIO RC5 / Analog Ch17 |
| Pin 27 | RC6/AN18/TX1/CK1 — GPIO RC6 / UART1 TX |
| Pin 28 | RC7/AN19/RX1/DT1 — GPIO RC7 / UART1 RX |
Typical Applications
PIC18F26Q84-I/SP is suitable for 6 applications: Automotive CAN FD Sensor Nodes, Industrial Sensor Hubs and PLC I/O Modules, Building Automation and HVAC Controllers, Smart Agriculture and Environmental Monitoring, Small Appliance Motor and Pump Control, Lighting Control and LED Drivers.
Automotive CAN FD Sensor Nodes
The PIC18F26Q84-I/SP's integrated CAN FD controller and industrial temperature grade make it a natural fit for automotive body and chassis sensor networks. In a CAN FD node the Q84 reads a sensor (temperature, pressure, or position) via its 12-bit ADC with computation, packages the data into a CAN FD frame (up to 64-byte payload), and transmits on the bus at up to 1 Mbps data phase. The wide 1.8-5.5 V supply enables direct connection to 12 V automotive rails after regulation. Hardware CIPs (CLC, CWG, timers) handle signal conditioning and PWM generation in parallel without CPU intervention, freeing the 16 MIPS core for application logic. For under-hood or harsh-environment nodes the E/SP variant is recommended. According to the Microchip PIC18-Q84 family brief, this architecture supports ISO 11898-1:2015 CAN FD compliance.
Recommended
Industrial Sensor Hubs and PLC I/O Modules
The PIC18F26Q84-I/SP serves as a cost-effective I/O concentrator in industrial sensor hubs and PLC-style expansion modules. Its 25 digital I/O pins, multiple UART/SPI/I2C interfaces, and CAN FD uplink combine to aggregate field sensor data from Modbus RTU slaves, I2C sensors, or SPI ADCs and forward them upstream via CAN FD. The 1.8-5.5 V supply tolerance is compatible with both 3.3 V sensor rails and legacy 5 V PLC backplanes. Hardware CIPs like CLC and the signal measurement timer implement precise edge detection and pulse counting without CPU load. With 64 KB Flash it has ample headroom for application-layer protocol stacks like CANopen or DeviceNet. Reference the Microchip AN2781 application note for CIP-based industrial design patterns.
Recommended
Building Automation and HVAC Controllers
In building automation systems, the PIC18F26Q84-I/SP can act as a local controller for HVAC dampers, valve actuators, and lighting nodes. Its CWG (Complementary Waveform Generator) directly produces complementary PWM signals for motor and dimmer control, while the CLC fabric implements custom logic glue (e.g., interlocks, debouncing) at the hardware level. The CAN FD interface allows these nodes to daisy-chain on an industrial building backbone without a separate gateway. The 64 MHz CPU (16 MIPS) easily runs control loops and Modbus/TCP-style protocols over UART. Power is typically 24 VAC-derived and regulated to 3.3 V or 5 V within the Q84 supply range. Reference Microchip TB3147 for HVAC CIP design patterns.
Smart Agriculture and Environmental Monitoring
Solar-powered remote agricultural monitoring stations benefit from the PIC18F26Q84-I/SP's wide 1.8-5.5 V supply and low-power sleep modes. The Q84 can wake periodically via the RTC, take soil moisture / temperature / CO2 sensor readings through its 12-bit ADC, and report over CAN FD, LoRa-attached UART, or NB-IoT modem. CIPs like the CLC can perform sensor fusion logic before the CPU even wakes, drastically reducing average current draw for multi-year battery life. With 64 KB Flash it accommodates OTA firmware update logic for remote fleet management. The 28-SPDIP package simplifies prototyping on weather-resistant perfboard. See Microchip AN2468 for low-power design guidance.
Recommended
Small Appliance Motor and Pump Control
Small appliances such as washing machines, dishwashers, and pool pumps use the PIC18F26Q84-I/SP as the main control MCU. The CWG and PWM peripherals generate complementary drive signals for 3-phase BLDC or single-phase PSC motors, while the integrated op-amp-like CLC cells implement current-sense amplification. The 64 KB Flash is sufficient for sensorless FOC or trapezoidal commutation firmware. CAN FD connectivity enables diagnostic reporting to a master appliance controller or service tool. The 1.8-5.5 V supply range supports both 3.3 V sensor rails and 5 V gate-driver interfaces. Reference Microchip AN1078 for sensorless BLDC techniques applicable to this MCU.
Recommended
Lighting Control and LED Drivers
Architectural and stage lighting controllers leverage the PIC18F26Q84-I/SP for DMX-compatible dimming and addressable LED string management. The 25 I/O pins can drive multiple LED strings via the CWG PWM outputs, while UART handles DMX512 reception. CAN FD enables daisy-chained lighting nodes on a building-wide network. The 16 MIPS core easily computes 16-bit-per-channel color mixing at high refresh rates. Wide 1.8-5.5 V supply supports battery-powered portable lighting and PoE-derived 5 V rails. See Microchip AN1079 for LED dimming firmware patterns and TB3060 for DMX over UART.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F26Q84-I/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F26Q84-I/SO | PIC18F26Q84-E/SP | PIC18F27Q84-I/SP | PIC18F26Q84-E/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SPDIP (SP) | 28-SOIC (SMD) | 28-SPDIP - same | 28-SPDIP - same | 28-SOIC (SMD) |
| Flash Memory | 64 KB | 64 KB | 64 KB | 128 KB | 64 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| CPU Speed | 64 MHz (16 MIPS) | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| CAN FD | Yes | Yes | Yes | Yes | Yes |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Extended (-40C to +125C) | Industrial | Extended (-40C to +125C) |
| Supply 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 |
Key Differentiators
- CAN FD integrated (vs PIC18F26Q43-I/SS)
- Through-hole 28-SPDIP for prototyping (vs PIC18F26Q84-I/SO)
- 64 KB Flash vs 128 KB on Q27 (vs PIC18F27Q84-I/SP)
Design Notes
The PIC18F26Q84-I/SP operates from 1.8 V to 5.5 V; place a 100 nF decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic on the supply rail. The MCU's two VDD pins (10 and 20) and two VSS pins (9 and 19) MUST both be connected. For CAN FD applications add a separate analog supply filter on AVDD if the design references internal voltage.
Do not skip the 4.7 kohm pull-up on the MCLR/RE3 pin if using external reset; floating MCLR can cause spurious resets. When using ICSP, ensure isolation resistors on RB6/RB7 (ICSPCLK/ICSPDAT) per Microchip AC244044 debug header guidance. Always configure unused pins as outputs low to minimize sleep current.
For CAN FD designs at >1 Mbps, use a twisted-pair bus with 120 ohm termination at each end. Reference Microchip AN228 for CAN FD bus layout; keep stub length below 1/10 of the bit width. Use MCP2551 or MCP2562FD transceivers; never connect the Q84 CAN pins directly to the bus.
Estimated: at 64 MHz and 5.5 V, the Q84 core draws about 15 mA active (~82 mW). At 25 C ambient in the 28-SPDIP package with theta_JA ~50 C/W, junction temperature rise is roughly 4 C - well within industrial limits. No heatsink required; provide minimum 100 sqmm copper pour on VDD plane for thermal spreading.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade (-40C to +85C). AEC-Q100 qualified variants available in PIC18F26Q84-E (Extended) form. Lead-free and halogen-free per Microchip material declaration.
