PIC18F05Q40T-I/SL - 32KB Flash 8-bit MCU, 64MHz, 14-SOIC | Microchip
MPN: PIC18F05Q40T-I/SL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.12 | $1.12 |
| 10 | $1.05 | $10.50 |
| 100 | $0.94 | $94.00 |
| 500 | $0.82 | $410.00 |
| 1,000 | $0.74 | $740.00 |
PIC18F05Q40T-I/SL Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, memory, and programmable I/O peripherals, used to embed intelligence in electronic systems ranging from consumer appliances to industrial controllers. The PIC18F family is Microchip's high-end 8-bit architecture, combining a RISC instruction set with advanced peripherals such as 16-bit PWMs, DMA, and configurable logic - bridging the gap between simple 8-bit parts and more expensive 16-bit MCUs.
Key features of the PIC18F05Q40 include a 64MHz internal oscillator with PLL, 12-bit ADC2 with computation modes for automated signal averaging and threshold comparison, two 8-bit DAC outputs, 16-bit PWM with complementary and dead-band modes, four Configurable Logic Cells that implement combinational/sequential logic without external gates, and CLC + DMA + PPS (Peripheral Pin Select) for flexible signal routing. The device also includes UART, SPI, and I2C peripherals, plus zero-crossing detection and a math accelerator.
Architecture-wise, the PIC18F05Q40 uses an enhanced Harvard RISC core with 8-bit data path and 16-bit instruction words, optimized C-friendly instruction set, and Microchip's eXtreme Low Power (XLP) technology for battery-friendly operation. The integrated DMA engine offloads peripheral-to-memory transfers from the CPU, enabling deterministic real-time response. PPS lets designers remap digital peripherals to nearly any I/O pin, simplifying PCB routing.
Typical applications include LED lighting and driver control, sensor signal conditioning, motor control with closed-loop feedback, capacitive-touch user interfaces, household appliances, IoT end-nodes, and small home appliances. The compact 14-SOIC footprint also suits space-constrained designs.
When designing with this MCU, verify the supply voltage range (1.8V-5.5V), provide adequate decoupling on VDD/AVDD, and use Microchip's MPLAB X IDE with XC8 compiler for code development. Programming is supported via ICSP.
This page synthesizes distributor pricing, drop-in same-family alternatives, and design notes not found in the manufacturer datasheet, enabling faster engineering decisions.
Drop-in alternatives for PIC18F05Q40T-I/SL — 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 PIC18F05Q40T-I/SL (same form factor and footprint) — differing in Package, ADC, PWM, DAC, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F05Q40-I/SL
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →PIC18F05Q40-E/SL
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →PIC18F04Q40-I/SL
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →PIC18F06Q40T-I/SL
✅ Drop-In✓ In Stock
$1.1 / Unit
View Datasheet →PIC18F04Q41-I/SL
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.85 / Unit
View Datasheet →PIC18F05Q40T-I/SL Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC |
| Program Memory (Flash) | 32 KB (32K x 8) |
| Data Memory (SRAM) | 2 KB |
| Data EEPROM | 512 bytes |
| Maximum CPU Speed | 64 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| ADC | 12-bit with Computation (ADC2) |
| DAC | 2 x 8-bit |
| PWM | 16-bit with complementary outputs |
| DMA Channels | Yes (Direct Memory Access) |
| Configurable Logic Cells (CLC) | Yes |
| Communication Peripherals | UART, SPI, I2C |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 14-SOIC (3.9 mm body width) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
PIC18F05Q40T-I/SL Pin Configuration
| Pin 1 | RA5 — Bidirectional I/O / ADC2 input / DAC reference |
| Pin 2 | RA4 — Bidirectional I/O / ADC2 input |
| Pin 3 | RA3 — Bidirectional I/O / MCLR (programming mode) |
| Pin 4 | RA2 — Bidirectional I/O / DAC1 output |
| Pin 5 | RA1 — Bidirectional I/O / I2C clock (PPS) |
| Pin 6 | RA0 — Bidirectional I/O / DAC2 output |
| Pin 7 | VSS — Ground reference |
| Pin 8 | RB7 — Bidirectional I/O / programming ICSPDAT |
| Pin 9 | RB6 — Bidirectional I/O / programming ICSPCLK |
| Pin 10 | RB5 — Bidirectional I/O / PWM output |
| Pin 11 | RB4 — Bidirectional I/O / PWM output |
| Pin 12 | VCC — Positive supply (1.8V to 5.5V) |
| Pin 13 | RB2 — Bidirectional I/O / ADC2 input |
| Pin 14 | RB1 — Bidirectional I/O / ADC2 input |
Typical Applications
PIC18F05Q40T-I/SL is suitable for 6 applications: LED Lighting and Driver Control, Industrial Sensor Signal Conditioning, Capacitive-Touch User Interface, Small Motor and BLDC Control, IoT Sensor Node Endpoint, Home Appliance Control Board.
LED Lighting and Driver Control
The PIC18F05Q40T-I/SL is an excellent fit for solid-state lighting controllers because its 16-bit PWM with complementary outputs and dead-band generation can directly drive half-bridge LED FETs at kHz switching frequencies without external timing chips. The 12-bit ADC2 with computation modes samples photodiode or current-sense feedback and applies hardware averaging offloaded from the CPU via DMA, freeing the 64MHz core to manage color-mixing algorithms, dim curves, and DMX-style command parsing over UART. A 14-SOIC footprint keeps the driver PCB small enough for MR16 bulbs and linear fixtures.
Recommended
Industrial Sensor Signal Conditioning
In PLC analog-input modules and 4-20mA sensor transmitters, the PIC18F05Q40T-I/SL combines a 12-bit ADC2 with zero-crossing detect and a math accelerator that performs linearization for thermocouples, RTDs, and bridge-type pressure sensors. DMA moves ADC samples into RAM while the CPU runs scaling math, and Configurable Logic Cells (CLC) implement glue logic - such as window comparators - without external gates. The 1.8V-5.5V supply range allows direct connection to 3.3V and 5V transducer rails.
Recommended
Capacitive-Touch User Interface
For touch-button keypads and slider controls on consumer appliances, the PIC18F05Q40T-I/SL integrates Microchip's mTouch capacitive-sensing firmware support and the 12-bit ADC2 oversampling engine, reducing external touch IC count. CLC blocks debounce mechanical-feel logic, DMA streams touch-scan data, and the 16-bit PWM drives LED backlight dimming synchronized with touch events. The 14-SOIC package and 1.8V operation support sealed membrane keypads on kitchen or laundry equipment.
Recommended
Small Motor and BLDC Control
Closed-loop control of small BLDC fans, pumps, and stepper subsystems benefits from the PIC18F05Q40T-I/SL's 16-bit PWM with complementary outputs and programmable dead-band - the timing primitives required to drive three-phase half-bridges safely. ADC2 sample-and-conversion is synchronized to PWM edges for back-EMF sensing, and DMA streams position feedback from QEI inputs without CPU intervention. The 64MHz core runs the field-oriented-control loop in software, removing the need for a dedicated DSPIC in low-power motor nodes.
Recommended
IoT Sensor Node Endpoint
Battery-powered IoT sensor end-nodes - such as air-quality monitors, leak detectors, and asset trackers - exploit the PIC18F05Q40T-I/SL's eXtreme Low Power (XLP) sleep currents below 1 microamp and integrated DMA-driven sensor acquisition. The 12-bit ADC2 plus two 8-bit DACs can drive analog sensor front-ends, while UART/SPI/I2C peripherals interface to radios or environmental sensors. PPS allows the SPI and I2C buses to be remapped to free pins, simplifying two-layer PCB layout in compact sensor housings.
Recommended
Home Appliance Control Board
Washing machines, dishwashers, coffee makers, and microwave user-interface boards benefit from the PIC18F05Q40T-I/SL's mix of timers, ADC, PWM, and CLCs. The 16-bit PWM modulates heating elements and triac-driven pumps, the ADC2 reads NTC thermistors and water-level sensors, and CLCs debounce door-switch signals. The 14-SOIC package and 1.8V-5.5V operation suit both 3.3V logic-level designs and legacy 5V switching boards, while ICSP allows firmware updates during appliance production.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F05Q40T-I/SL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F05Q40-I/SL | PIC18F05Q40-E/SL | PIC18F04Q40-I/SL | PIC18F06Q40T-I/SL | PIC18F04Q41-I/SL |
|---|---|---|---|---|---|---|
| Package | 14-SOIC (SL) | 14-SOIC (SL) - same | 14-SOIC (SL) - same | 14-SOIC (SL) - same | 14-SOIC (SL) - same | 14-SOIC (SL) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 16 KB | 64 KB | 16 KB |
| Data Memory (SRAM) | 2 KB | 2 KB | 2 KB | 1 KB | 2 KB | 1 KB |
| Data EEPROM | 512 bytes | 512 bytes | 512 bytes | 256 bytes | 512 bytes | 256 bytes |
| Maximum CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| ADC | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 |
| DMA | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Highest memory density in 14-SOIC PIC18-Q40 family (vs PIC18F04Q40-I/SL)
- Pin-compatible path to higher-temperature environments (vs PIC18F05Q40-E/SL)
- Field upgradability to more memory without layout change (vs PIC18F06Q40T-I/SL)
Design Notes
Estimated: at 64MHz CPU and all peripherals active, the PIC18F05Q40 draws roughly 8-12 mA from VDD; in sleep mode with WDT disabled, XLP technology drops this to below 1 microamp. Place a 100nF decoupling capacitor within 5mm of the VCC pin (pin 12), and add a 10uF bulk capacitor on the VDD rail if the source impedance is high. For battery designs, gate the ADC2 and voltage-reference blocks via firmware to avoid leakage paths during deep sleep.
Route the ICSP pins (RB6/ICSPCLK and RB7/ICSPDAT) to test pads or a 6-pin header even if you do not plan in-circuit programming in production - this allows firmware updates and field recovery. Keep the analog inputs (RA0-RA5, RB1, RB2) away from switching PWM traces and clock signals; if layout is tight, use Microchip's PPS to move the digital peripherals to alternate pins and free the analog pins for cleaner routing. Place the AVSS pin (same as VSS on 14-SOIC variants) on a low-impedance ground pour.
Do not exceed 5.5V on VCC or apply voltage to any I/O pin while the device is unpowered - this can cause latch-up through internal ESD diodes. The MCLR/RA3 pin (pin 3) requires a 10k pull-up to VCC for normal operation; omit it only if you intentionally use MCLR as a reset input. When using the ADC2 in computation mode, set ACQT and ADCS correctly per the datasheet - insufficient acquisition time causes noisy readings on high-impedance analog sources.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F05Q40-E/SL for extended industrial temp applications. Lead-free and halogen-free per Microchip environmental compliance documentation.
