PIC18F05Q40-E/ST - 32KB Flash, 64MHz 8-bit MCU | Microchip
MPN: PIC18F05Q40-E/ST ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.3 | $13.00 |
| 100 | $1.18 | $118.00 |
| 500 | $1.08 | $540.00 |
| 1,000 | $0.98 | $980.00 |
PIC18F05Q40-E/ST Overview
An 8-bit microcontroller (MCU) is a microprocessor integrated with program memory, data memory, I/O peripherals, and a CPU on a single silicon die, optimized for embedded control tasks. The PIC18 architecture sits in the broader taxonomy as: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor device. PIC18-Q40 family parts are particularly suited for low-power sensor interfacing and closed-loop control loops, with on-chip analog and digital peripherals eliminating many external components.
The 12-bit ADC2 with Computation performs hardware averaging, threshold comparison, and automated accumulation, offloading CPU overhead in high-sample-rate sensor reads. The dual 8-bit DACs enable dual-channel analog output references or waveform generation. The 16-bit PWMs support high-resolution motor control, LED dimming, and digital power conversion. Direct Memory Access (DMA) moves ADC results to memory without CPU intervention, freeing the core for application logic. PPS allows remapping of digital peripherals to a wide range of pins, simplifying PCB layout.
Typical applications include IoT sensor nodes, BLDC motor control, smart lighting, battery management, home appliance controls, and consumer electronics with capacitive touch or rotary user interfaces. The wide 1.8V to 5.5V supply range supports both single-cell Li-ion and 5V-rail designs.
When designing with this device, leverage PPS to optimize PCB routing and use ADC2 with Computation to minimize firmware overhead. Pair the TSSOP-14 variant with the PIC18-Q40 family toolchain (MPLAB X IDE + XC8 compiler + MPLAB Code Configurator) for rapid peripheral configuration.
Drop-in alternatives for PIC18F05Q40-E/ST — 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 PIC18F05Q40-E/ST (same form factor and footprint) — differing in ADC, Package, DAC, PWM, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F04Q40-I/ST
✅ Drop-In✓ In Stock
$0.82 / Unit
View Datasheet →PIC18F05Q40-E/SL
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.74 / Unit
View Datasheet →PIC18F05Q40-I/ST
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F05Q40-E/ST Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit) |
| Program Memory (Flash) | 32 KB (32K x 8) |
| RAM | 2 KB |
| EEPROM | 512 bytes |
| Maximum CPU Speed | 64 MHz |
| Supply Voltage | 1.8 V to 5.5 V |
| ADC | 12-bit ADC2 with Computation |
| DAC | 2 x 8-bit DAC |
| PWM | 16-bit PWM |
| DMA | Yes (Direct Memory Access) |
| Configurable Logic Cells (CLC) | Yes |
| Peripheral Pin Select (PPS) | Yes |
| Communication | UART, SPI, I2C |
| Package | 14-TSSOP |
| Operating Temperature | -40C to +125C (E = Extended) |
PIC18F05Q40-E/ST Pin Configuration
| Pin 1 | RA0/ICDDAT — I/O / ICSP Data |
| Pin 2 | RA1/ICDCLK — I/O / ICSP Clock |
| Pin 3 | RA2 — I/O with PPS |
| Pin 4 | RA3/MCLR — I/O / Master Clear (Reset) |
| Pin 5 | RA4 — I/O with PPS |
| Pin 6 | RA5 — I/O with PPS |
| Pin 7 | VSS — Ground |
| Pin 8 | RA6 — I/O with PPS / OSC2 |
| Pin 9 | RA7 — I/O with PPS / OSC1 |
| Pin 10 | RB0 — I/O with PPS / INT |
| Pin 11 | RB1 — I/O with PPS |
| Pin 12 | RB2 — I/O with PPS |
| Pin 13 | RB3 — I/O with PPS |
| Pin 14 | VDD — Positive supply voltage (1.8V to 5.5V) |
Typical Applications
PIC18F05Q40-E/ST is suitable for 6 applications: IoT Sensor Node, BLDC Motor Control, Smart Lighting and LED Drivers, Battery Management Systems, Home Appliance Control, Capacitive Touch User Interface.
IoT Sensor Node
The PIC18F05Q40-E/ST is well-suited for IoT sensor nodes due to its 12-bit ADC2 with Computation and direct memory access (DMA) which offloads signal-conditioning from the CPU, enabling low-power operation for battery-driven deployments. The 16-bit PWM is useful for driving indicator LEDs or actuator control loops while maintaining firmware configurability. With 32KB Flash, 2KB RAM, and the wide 1.8V to 5.5V supply range, the MCU supports single-cell Li-ion or 5V-rail designs spanning industrial IoT, smart agriculture, and building automation. PPS allows designers to route peripherals to convenient pins, simplifying PCB layout.
Recommended
BLDC Motor Control
For BLDC motor control, the PIC18F05Q40-E/ST offers 16-bit PWM for high-resolution switching and dual 8-bit DACs for analog reference signals or waveform synthesis. Configurable Logic Cells (CLC) allow event-triggered hardware responses without CPU intervention, ideal for motor commutation timing. The 12-bit ADC2 with Computation handles back-EMF sensing and current measurement with hardware averaging to reduce signal noise. Operating up to 64MHz, the core provides fast loop times, while the wide supply voltage supports 3.3V and 5V motor driver power rails.
Recommended
Smart Lighting and LED Drivers
In smart lighting applications, the PIC18F05Q40-E/ST's 16-bit PWM provides smooth, high-resolution LED dimming without visible flicker at low duty cycles. The 12-bit ADC2 with Computation handles ambient light sensor inputs with hardware averaging for stable feedback. Dual 8-bit DACs can drive tunable white or color-mixing LEDs. The 32KB Flash supports complex lighting protocols and color-temperature algorithms. PPS allows flexible PCB routing for compact bulb form factors.
Recommended
Battery Management Systems
The PIC18F05Q40-E/ST suits battery management with its 12-bit ADC2 with Computation for accurate cell voltage and current measurements, plus configurable thresholds for over-voltage/under-voltage protection. The wide 1.8V to 5.5V supply range operates directly from single-cell Li-ion or multi-cell NiMH packs. Dual 8-bit DACs enable programmable reference outputs for charger control loops. Hardware DMA moves ADC samples without CPU intervention, allowing low-power sleep modes between measurements.
Recommended
Home Appliance Control
For home appliances, the PIC18F05Q40-E/ST provides reliable 8-bit processing with sufficient Flash and RAM for state machines, user interface handling, and sensor fusion. UART/SPI/I2C interfaces connect to displays, sensors, and communication modules. The 16-bit PWM drives heating elements, fans, or pump motors with precise proportional control. PPS lets designers map peripherals to convenient pins even on dense PCBs.
Recommended
Capacitive Touch User Interface
The PIC18F05Q40-E/ST supports capacitive touch sensing through its mTouch peripheral interface and Configurable Logic Cells (CLC) for hardware-level touch event detection. 12-bit ADC2 with Computation provides precise touch measurement with hardware averaging for noise rejection. The 16-bit PWM can drive haptic feedback actuators. With 32KB Flash, complex touch libraries and gesture recognition algorithms fit comfortably. PPS allows mapping touch channels to convenient PCB locations, ideal for appliances and consumer products.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F05Q40-E/ST — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F04Q40-I/ST | PIC18F05Q40-E/SL | PIC18F05Q40-I/ST |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-TSSOP | 14-TSSOP - same | 14-SOIC - different footprint, same pin count | 14-TSSOP - same |
| Program Memory (Flash) | 32 KB | 16 KB | 32 KB | 32 KB |
| RAM | 2 KB | 1 KB | 2 KB | 2 KB |
| EEPROM | 512 bytes | 256 bytes | 512 bytes | 512 bytes |
| Maximum CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Supply Voltage | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V |
| Temperature Range | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
| ADC | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 | 12-bit ADC2 |
| Approx. Unit Price (qty 100) | $1.18 | $1.05 | $1.20 | $1.15 |
Key Differentiators
- Memory density in compact TSSOP-14 package (vs PIC18F04Q40-I/ST)
- Extended temperature grade support (vs PIC18F05Q40-I/ST)
- 12-bit ADC2 with Computation capability (vs PIC18F05Q40-E/SL)
Design Notes
Place decoupling capacitors (100nF ceramic + 10uF bulk) as close as possible to VDD/VSS pins (pins 14 and 7) on the 14-TSSOP package. PPS allows remapping of digital peripherals, so consider pin assignment flexibility during schematic capture to optimize PCB routing. Keep analog signal traces short and away from high-frequency digital signals to minimize ADC noise coupling. The 14-TSSOP's small 1.0mm body width requires careful PCB pad design for reliable soldering.
The PIC18F05Q40-E/ST operates from 1.8V to 5.5V, supporting both single-cell Li-ion battery and 5V-rail designs. The wide supply range enables direct connection to battery stacks without additional regulation. Use the ADC2 with Computation's hardware averaging to reduce active CPU time during sensor reads, allowing longer sleep-mode periods for battery-powered applications. Estimated: at 32MHz with all peripherals active, typical current consumption is approximately 8-12mA, dropping to sub-microamp levels in sleep.
The MCLR pin (pin 4) is shared with RA3 and requires proper configuration in the configuration words to function correctly. Ensure unused I/O pins are configured as outputs and tied low, or as inputs with internal pull-ups enabled to minimize current consumption. The ADC2 peripheral uses VDD as reference by default - for precision measurements, consider using an external reference voltage via the VREF+ pin function. Always include proper ESD protection on externally accessible pins.
When using the TSSOP-14 footprint, ensure the PCB pad dimensions match the recommended land pattern in the Microchip package specification document. The exposed thermal pad (if present in variant) should be soldered to a ground plane for thermal dissipation. PPS flexibility means designers can place critical signals on convenient pin locations, but maintain short traces for high-speed signals like crystal oscillator connections (pins 8/9 for RA6/RA7 in XT mode).
Compliance Information
RoHS compliant per Microchip product documentation. Lead-free and halogen-free per Microchip environmental compliance statements. AEC-Q100 qualification not standard for this part - check PIC18F-Q40 automotive variants if required.
