PIC18F16Q40-I/SS - 8-bit 64MHz 64KB Flash MCU | Microchip | Real-Time Control
MPN: PIC18F16Q40-I/SS ✓ ActivePIC18F16Q40-I/SS Overview
A PIC18 microcontroller is a Harvard-architecture 8-bit RISC device from Microchip's PIC family, designed for deterministic real-time control. Within the broader taxonomy it belongs to the PIC18-Q40 sub-family, which sits above 8-bit PIC MCUs and below Microchip's 16-bit dsPIC and 32-bit families. The PIC18-Q40 family is specifically optimized for applications that combine analog signal conditioning (CVD touch, oversampling, threshold decision) with digital actuation (PWM, DMA-driven peripheral updates) on a single low-pin-count device.
Key features of the PIC18F16Q40 include 12-bit ADCC with Capacitive Voltage Divider support, 16-bit PWM with multiple modes, two 8-bit DACs, Configurable Logic Cells for glue-logic replacement, on-chip DMA for low-CPU-overhead data movement, and a wide 1.8 V to 5.5 V operating voltage range. The device also integrates an internal oscillator, multiple communication peripherals (I2C, SPI, UART with LIN), and a vectored interrupt architecture with prioritized peripheral triggers. The 20-pin SSOP package supports 18 I/O pins.
The 64 MHz system clock (with 4x PLL option on the internal 16 MHz HFINTOSC) provides 16 MIPS peak throughput, and the ADCC engine automates averaging, oversampling, and threshold comparison, offloading CPU work in sensor-fusion designs. The integrated 16-bit PWM combined with DMA enables jitter-free control loops for LED lighting, motor commutation, and switched-mode power stages.
Typical applications include capacitive-touch user interfaces, LED lighting controllers, BLDC/PMSM small motor control, sensor signal conditioning, and low-cost general-purpose embedded control nodes in industrial and consumer systems. The Q40 family is also suited to functional-safety-adjacent designs where ADCC thresholds can implement hardware-decision paths.
When designing with the PIC18F16Q40-I/SS, ensure the ICSP programming pins (PGx, PGM) are accessible on the layout and the MCLR pull-up is correctly biased. Use the ADCC burst-average mode for low-noise sensor reads and prefer DMA over CPU-driven peripheral servicing for tight timing budgets. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC18F16Q40-I/SS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesPIC18F16Q40-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC (Harvard) |
| Family | PIC18-Q40 |
| Maximum CPU Frequency | 64 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| Data SRAM | 4 KB |
| Data EEPROM | 512 bytes |
| Operating Voltage Range | 1.8 V to 5.5 V |
| ADC | 12-bit ADC with Computation (ADCC) |
| DAC | 2 x 8-bit DAC |
| PWM | 16-bit PWM (multiple channels) |
| DMA | Yes (peripheral-to-memory / memory-to-peripheral) |
| Configurable Logic Cells (CLC) | Yes |
| I/O Pins | 18 |
| Package | 20-pin SSOP (5.30 mm body) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial) |
| RoHS Status | Compliant |
PIC18F16Q40-I/SS Pin Configuration
| Pin 1 | RA5 — Port A bit 5 / I/O |
| Pin 2 | RA4 — Port A bit 4 / I/O |
| Pin 3 | RA3 — Port A bit 3 / I/O |
| Pin 4 | RC5 — Port C bit 5 / I/O |
| Pin 5 | RC4 — Port C bit 4 / I/O |
| Pin 6 | RC3 — Port C bit 3 / I/O |
| Pin 7 | RC2 — Port C bit 2 / I/O |
| Pin 8 | RC1 — Port C bit 1 / I/O |
| Pin 9 | RC0 — Port C bit 0 / I/O |
| Pin 10 | RA2 — Port A bit 2 / I/O |
| Pin 11 | RA1 — Port A bit 1 / I/O (ICSPCLK) |
| Pin 12 | RA0 — Port A bit 0 / I/O (ICSPDAT) |
| Pin 13 | VSS — Ground reference |
| Pin 14 | RA7 — Port A bit 7 / I/O (OSC1) |
| Pin 15 | RA6 — Port A bit 6 / I/O (OSC2) |
| Pin 16 | VDD — Positive supply voltage |
| Pin 17 | RB5 — Port B bit 5 / I/O |
| Pin 18 | RB4 — Port B bit 4 / I/O |
| Pin 19 | RB3 — Port B bit 3 / I/O |
| Pin 20 | RB2 — Port B bit 2 / I/O |
Typical Applications
PIC18F16Q40-I/SS is suitable for 6 applications: Capacitive Touch User Interface, LED Lighting Controller, Small BLDC / PMSM Motor Control, Sensor Signal Conditioning Hub, IoT Edge Sensor Node, Industrial Control Module.
Capacitive Touch User Interface
The PIC18F16Q40's 12-bit ADCC with Capacitive Voltage Divider (CVD) support automates touch-sensing on up to 18 pins, eliminating the need for an external touch controller. In a typical 8-button keypad or slider, the device scans sensors with hardware oversampling and threshold comparison, offloading the CPU for low-power sleep between touches. The 64 MHz core and DMA enable sub-10 ms response times, while the SSOP-20 footprint keeps the BOM compact. Compared to legacy CTMU designs, the ADCC's auto-averaging provides more stable readings in noisy industrial environments.
Recommended
LED Lighting Controller
The PIC18F16Q40-I/SS drives multi-channel LED strings via its 16-bit PWM with high-resolution dimming and complementary outputs. Hardware dead-band control prevents shoot-through in MOSFET half-bridges, while DMA updates duty-cycle registers without CPU jitter. The two 8-bit DACs provide analog reference outputs for tunable-white or color-mixing designs. Operating from 1.8 V to 5.5 V, the MCU interfaces directly with 3.3 V logic-level LED drivers and supports DMX, DALI, or 0-10 V control via UART or ADC channels.
Recommended
Small BLDC / PMSM Motor Control
The 16-bit PWM with complementary outputs, programmable dead-band, and fault inputs make the PIC18F16Q40-I/SS well-suited to small sensorless or Hall-sensor BLDC and PMSM motors in fans, pumps, and small appliances. DMA-driven ADCC conversions of back-EMF or current-sense signals execute with deterministic timing, supporting 20 kHz+ PWM frequencies. The CLC cells can implement commutation-trigger logic in hardware, reducing firmware complexity. For designs above 1 kW or requiring field-oriented control, migrate to the dsPIC33CK family.
Recommended
Sensor Signal Conditioning Hub
The PIC18F16Q40's ADCC performs oversampling, averaging, and threshold comparison on analog sensor outputs, generating interrupts only when a meaningful event occurs. This lets the device sit in sleep mode most of the time, waking on threshold crossings and DMA-reading the result. The integrated temperature indicator, combined with external thermistor or RTD inputs through the 12-bit ADC, supports calibrated industrial sensor nodes. UART, I2C, and SPI provide flexible connectivity to upstream controllers.
Recommended
IoT Edge Sensor Node
With 64 KB Flash, 4 KB SRAM, and integrated peripherals, the PIC18F16Q40-I/SS serves as a low-power edge node aggregating sensor data and transmitting over UART, SPI, or I2C. The wide 1.8 V to 5.5 V VDD range supports direct battery or energy-harvesting supplies. CLC cells can implement hardware wake-on-pattern logic, while the DMA engine offloads repetitive peripheral servicing for ultra-low duty-cycle operation. Pair with an external sub-GHz or BLE module via SPI for IoT connectivity.
Recommended
Industrial Control Module
The industrial -40C to +85C temperature range, 5.5 V tolerant I/O, and robust peripherals make the PIC18F16Q40-I/SS a fit for industrial PLC-style sub-modules, HMI keypads, and process-control actuators. Configurable Logic Cells replace external glue logic, the DMA engine guarantees deterministic peripheral servicing, and the 16-bit PWM can drive solenoids or proportional valves directly. The SSOP-20 footprint suits compact DIN-rail-mounted designs where board real estate is at a premium.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F16Q40-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F14Q40-I/SS | PIC18F15Q40-I/SS | PIC18F15Q41-I/SS |
|---|---|---|---|---|
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Core | PIC18 8-bit 64 MHz | PIC18 8-bit 64 MHz | PIC18 8-bit 64 MHz | PIC18 8-bit 64 MHz |
| Flash Memory | 64 KB | 16 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 1 KB | 2 KB | 2 KB |
| EEPROM | 512 bytes | 256 bytes | 256 bytes | 256 bytes |
| ADC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC (enhanced) |
| Operating 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 |
| I/O Pins | 18 | 18 | 18 | 18 |
Key Differentiators
- Largest Flash in 20-pin Q40 SSOP family (vs PIC18F15Q40-I/SS)
- 64 KB Flash with full Q40 peripheral set (vs PIC18F14Q40-I/SS)
- 20-pin SSOP package in Q40 generation (vs Q41) (vs PIC18F15Q41-I/SS)
Design Notes
The PIC18F16Q40 supports 1.8 V to 5.5 V VDD operation. Place a 100 nF decoupling capacitor as close as possible to the VDD pin, with a 10 uF bulk capacitor on the board power rail. For battery applications, the device's low-power sleep modes and the LFINTOSC allow current consumption under typical Microchip datasheet figures; always verify the exact sleep current in the latest datasheet revision.
The ICSP programming pins (ICSPDAT/ICSPCK) on RA0/RA1 must remain accessible for in-circuit programming and debugging. Avoid routing high-speed signals on these pins if they are needed for production programming. The SSOP-20 footprint has tight pin pitch; use a 4-layer PCB with a continuous ground plane under the MCU to reduce EMI and improve ADC noise performance for CVD touch applications.
When migrating firmware between PIC18F14Q40, PIC18F15Q40, and PIC18F16Q40 devices, double-check the Flash memory map and IVT (interrupt vector table) offsets, which differ between Q40 and Q41 generations. The Q41 family (e.g. PIC18F15Q41) has enhanced CLC and ADCC peripherals - code written for Q40 will compile on Q41 but the peripheral initialization sequences differ. Always verify against the latest Microchip code examples for the target sub-family.
Compliance Information
RoHS compliant per Microchip product page and DigiKey listing. AEC-Q100 not applicable for general-purpose MCU. Lead-free SSOP-20 finish compatible with lead-free reflow.
