PIC18F27Q84T-I/5N - CAN-FD MCU 128KB Flash 28-VQFN
MPN: PIC18F27Q84T-I/5N ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.94 | $1,470.00 |
| 1,000 | $2.65 | $2,650.00 |
PIC18F27Q84T-I/5N Overview
An 8-bit microcontroller (MCU) is a compact computing core that combines a CPU, Flash program memory, SRAM, EEPROM and multiple peripheral blocks on a single silicon die. The PIC18 family extends this with a RISC-modified Harvard architecture that delivers deterministic instruction execution at 64 MHz, while the Q84 sub-family layers in CIPs that handle PWM, ADC, communications, and timing without CPU intervention.
Key differentiating features include integrated CAN-FD (Controller Area Network Flexible Data Rate) for automotive and industrial networking at up to 8 Mbps, Hardware Custom Logic (HLT) configurable via CWG for zero-latency waveform generation, and Math Accelerator/32-bit accumulators in the ADC for offloading DSP-style signal processing. The on-chip Zero-Cross Detection (ZCD) and PPS (Peripheral Pin Select) simplify sensor interfaces and PCB routing in cost-sensitive designs.
Architecturally, the device uses Microchip's XLP (eXtreme Low Power) technology with IDLE/DOZE/PMD power-management modes, plus Windowed Watchdog Timer (WWDT), SENT and CRC/SCAN for functional safety. The 28-VQFN-EP package exposes a thermal pad that ties directly to the ground plane, allowing the MCU to dissipate heat from the high-current I/O drivers.
Typical applications include automotive body and HVAC control modules, industrial sensor hubs running CAN-FD, BLDC motor control via FOC algorithms using the DSM and CCP peripherals, IoT edge nodes, and consumer appliances with capacitive touch interfaces using the on-chip HLT and ADC.
When designing with the PIC18F27Q84T-I/5N, ensure MCLR is tied through a 10 kohm pull-up, that VDD decoupling is 100 nF plus a bulk 1 uF within 5 mm of each rail pin, and that the exposed pad is soldered to a continuous ground copper pour for thermal performance.
Drop-in alternatives for PIC18F27Q84T-I/5N — 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 PIC18F27Q84T-I/5N (same form factor and footprint) — differing in Core Independent Peripherals (CIPs), Package, ADC, Core, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F27Q83T-I/5N
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.78 / Unit
View Datasheet →PIC18F27Q84T-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F27Q84-E/5N
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F27Q84-E/SS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.16 / Unit
View Datasheet →PIC18F26Q84-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.65 / Unit
View Datasheet →PIC18F27Q84T-I/5N Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Family | PIC18 Q84 |
| Core | PIC18 (RISC Harvard) |
| Program Memory (Flash) | 128 KB (64K x 16 words) |
| SRAM | 13 KB |
| EEPROM | 1 KB |
| Maximum CPU Clock | 64 MHz |
| ADC | 12-bit ADC3 (multiple channels) |
| DAC | 5-bit / 10-bit DAC |
| CAN Module | CAN-FD |
| Communication Peripherals | 2x UART, SPI, I2C, CAN-FD |
| PWM / DSM | Multiple PWM + DSM channels |
| Core Independent Peripherals (CIPs) | CWG, HLT, ZCD, WWDT, CRC/SCAN, PPS |
| Operating Temperature Range | -40C to +85C (Industrial, -I) |
| Package | 28-pin VQFN (6x6 mm) with EP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Peripheral Pin Select | Yes (PPS) |
PIC18F27Q84T-I/5N Pin Configuration
| Pin 1 | RA0/AN0 — Analog input 0 / GPIO |
| Pin 2 | RA1/AN1 — Analog input 1 / GPIO |
| Pin 3 | RA2/AN2 — Analog input 2 / GPIO |
| Pin 4 | RA3/MCLR — Master Clear (reset) input / GPIO |
| Pin 5 | RA4/AN3 — Analog input 3 / GPIO |
| Pin 6 | RA5/AN4 — Analog input 4 / GPIO |
| Pin 7 | RA6 — GPIO |
| Pin 8 | RA7 — GPIO |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply voltage |
| Pin 11 | RB0/INT — External interrupt / GPIO |
| Pin 12 | RB1 — GPIO |
| Pin 13 | RB2 — GPIO |
| Pin 14 | RB3 — GPIO |
| Pin 15 | RB4 — GPIO |
| Pin 16 | RB5 — GPIO |
| Pin 17 | RB6/ICSPCLK — In-Circuit Serial Programming clock / GPIO |
| Pin 18 | RB7/ICSPDAT — In-Circuit Serial Programming data / GPIO |
| Pin 19 | RC0 — GPIO |
| Pin 20 | RC1 — GPIO |
| Pin 21 | RC2 — GPIO |
| Pin 22 | RC3 — GPIO |
| Pin 23 | RC4 — GPIO |
| Pin 24 | RC5 — GPIO |
| Pin 25 | RC6 — GPIO |
| Pin 26 | RC7 — GPIO |
| Pin 27 | RE3 — GPIO (shared with MCLR configuration) |
| Pin 28 | VSS/EP — Ground / Exposed thermal pad |
Typical Applications
PIC18F27Q84T-I/5N is suitable for 7 applications: Automotive Body and HVAC Control Modules, Industrial Sensor Hub with CAN-FD, BLDC Motor Control via FOC, IoT Edge Node / Smart Sensor, White Goods and Appliance Control, LED Lighting and Driver Control, Consumer HMI with Capacitive Touch.
Automotive Body and HVAC Control Modules
The PIC18F27Q84T-I/5N fits automotive body and HVAC modules because its hardware CAN-FD controller supports up to 8 Mbps on the data phase, while the on-chip 12-bit ADC3 and Core Independent Peripherals (CIPs) handle multiple thermistor and blower-motor feedback channels without CPU load. Its 128 KB Flash comfortably hosts a CAN-FD stack plus HVAC control laws with field-update headroom. Placed behind a CAN-FD transceiver the MCU arbitrates classic CAN traffic and bursts FD frames at high rate, while PWM channels drive blower and mode-door actuators directly; this eliminates external logic ICs and reduces BOM cost versus 32-bit alternatives.
Recommended
Industrial Sensor Hub with CAN-FD
For industrial 4-20 mA / 0-10 V sensor hubs, the PIC18F27Q84T-I/5N integrates 12-bit ADC3 with computation, hardware CRC/SCAN, and a Zero-Cross Detection (ZCD) peripheral that synchronizes AC-line sensing to mains zero crossings. The CAN-FD controller publishes high-rate sensor payloads over a robust bus in noisy factory environments where classical CAN would be saturated. Deployed as a slave node on a factory CAN-FD backbone, the MCU samples up to 12 analog inputs while offloading CRC and zero-cross events to CIPs, leaving the CPU free for application logic.
Recommended
BLDC Motor Control via FOC
Sensorless or Hall-sensor BLDC motor control benefits from the PIC18F27Q84T-I/5N's DSM (Data Signal Modulator) plus PWM/CCP channels, which generate the six-step or sinusoidal commutation patterns required for field-oriented control. The 64 MHz / 16 MIPS core executes FOC math within 50 microsecond loops, while the HLT and CWG peripherals handle current-sense blanking and overcurrent protection without software latency. The result is a single-chip FOC drive stage that replaces traditional 32-bit DSPs at lower BOM cost in pumps, fans and small appliance drives.
Recommended
IoT Edge Node / Smart Sensor
The PIC18F27Q84T-I/5N is well matched to IoT edge nodes where XLP (eXtreme Low Power) modes, 128 KB Flash for over-the-air stacks, and 13 KB SRAM for buffering place it ahead of smaller 8-bit MCUs. Peripheral Pin Select (PPS) routes I2C, SPI, and UART to any GPIO, simplifying PCB layout when RF modules and sensors are added. Combined with a low-power sub-1 GHz or BLE module, the Q84 forms a battery-friendly edge node publishing to gateway over UART/SPI.
Recommended
White Goods and Appliance Control
Washing machines, dishwashers, and induction cooktops use the PIC18F27Q84T-I/5N as the primary controller because the integrated 12-bit ADC3 with hardware averaging reads NTC thermistors directly, while the ZCD peripheral synchronizes TRIAC triggering to mains zero crossings for heater and motor control. The IPS (Peripheral Pin Select) reduces PCB routing complexity in cramped appliance mainboards. Used in the control board the MCU drives relays, PWM-controlled valves, and user-interface keypads while maintaining functional-safety compliance through on-chip WWDT and CRC/SCAN.
Recommended
LED Lighting and Driver Control
The PIC18F27Q84T-I/5N drives high-brightness LED strings via its multiple PWM and DSM channels, with hardware Custom Logic (HLT) implementing flicker-free dimming curves and current-loop error detection without CPU intervention. The 12-bit ADC3 reads LED-string current through a sense resistor for closed-loop regulation, while 128 KB Flash stores fixture-specific dimming profiles and DMX/CAN-FD lighting protocols. The result is a tunable-white or RGBW fixture controller that fits in a 28-VQFN footprint alongside an external LED driver IC.
Recommended
Consumer HMI with Capacitive Touch
The PIC18F27Q84T-I/5N's HLT peripheral plus on-chip ADC can implement capacitive touch buttons and sliders, replacing mechanical keypads on white goods and consumer devices. Combined with PWM-driven LED backlighting and the 128 KB Flash for UI state machines, designers get a compact single-chip HMI solution. The 28-VQFN footprint lets the MCU sit behind a glass panel, while the wide peripheral mix eliminates the external touch controller IC.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F27Q84T-I/5N — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F27Q83T-I/5N | PIC18F27Q84-E/5N | PIC18F27Q84-E/SS | PIC18F26Q84-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-VQFN (6x6 mm) with EP | 28-VQFN (6x6) - same | 28-VQFN (6x6) - same | 28-SSOP - note different | 28-SOIC - note different |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB (-50%) |
| Maximum CPU Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| CAN-FD | Yes | Yes | Yes | Yes | Yes |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +85C |
| 12-bit ADC3 | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Dedicated hardware CAN-FD controller with on-chip CIP acceleration (vs PIC18F27Q83T-I/5N)
- Industrial temperature range -40C to +85C standard (vs PIC18F27Q84-E/5N)
- 28-VQFN compact footprint with exposed thermal pad (vs PIC18F27Q84T-I/SO)
- Pin-compatible Q84 family for design flexibility (vs PIC18F26Q84-I/SO)
Design Notes
Place a 100 nF X7R decoupling capacitor within 5 mm of each VDD pin and a bulk 1 uF to 10 uF ceramic near the MCU. Add a 10 kohm pull-up on MCLR (pin 4) tied to VDD; in noisy automotive environments add a 100 nF bypass from MCLR to ground to delay reset during supply transients. Estimated: at 64 MHz with all peripherals active the core draws ~15 mA typical, so a low-dropout regulator with at least 100 mA headroom is recommended for the VDD rail.
Solder the exposed thermal pad (pin 28 / EP) to a continuous ground copper pour with at least 16 thermal vias tying it to inner ground layers. The exposed pad provides the primary heat-dissipation path for the 28-VQFN package; without it the junction-to-ambient thermal resistance rises and the MCU can throttle or fail reliability screening. Estimated: at 50 mA total current dissipation the EP keeps theta_JA below 30 C/W on a 4-layer board with 1 oz copper.
Use Microchip's PPS (Peripheral Pin Select) to remap I2C, SPI, UART and PWM to alternate I/O pins after PCB layout, simplifying routing when the MCU sits behind connectors or RF shields. Keep CAN-FD TX/RX traces to the transceiver shorter than 50 mm and route them over a continuous ground plane to maintain the bus arbitration bit-time tolerance. Place the CAN-FD transceiver (e.g., MCP2562FD) within 10 mm of the MCU CAN pins to minimize stub length.
Do not float the MCLR pin - always tie it through a pull-up to VDD or the in-circuit programmer will not be able to enter debug mode. AVSS and VSS must be tied to the same ground star point to avoid ADC offset errors; for sensors reading millivolts, route analog and digital grounds separately back to the decoupling cap on the AGND/AVSS pin. Estimated: analog ADC readings can drift by 5-10 LSB if AVSS is not bonded close to the MCU's ground reference.
The CAN-FD interface is robust against EMI when the bus differential traces are length-matched to within 1 mm and the CAN bus is terminated with 120 ohm split termination at each end. Add a common-mode choke on the CANH/CANL lines if the harness exceeds 2 meters; this is mandatory for automotive CAN-FD conformance testing per ISO 11898-1:2015. The on-chip CRC/SCAN peripheral can log transient errors for post-deployment fault analysis.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial -40C to +85C operating range (I grade). AEC-Q100 qualified variants are not typically available in the I/5N package order - check Microchip automotive-grade PIC18F-family ordering codes for AEC-Q100.
