PIC18F14Q40T-I/SS - 8-bit MCU, 16KB Flash, SSOP-20 | Microchip
MPN: PIC18F14Q40T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.42 | $142.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.02 | $1,020.00 |
PIC18F14Q40T-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and a configurable set of peripheral blocks around a shared bus. The PIC18 family uses an 8-bit modified Harvard architecture with separate program and data buses, enabling deterministic single-cycle instruction execution. Within the broader PIC product taxonomy, the PIC18F14Q40 belongs to the PIC18-Q40 sub-family, which adds low-power Core Independent Peripherals (CIPs), Direct Memory Access (DMA), and Peripheral Pin Select (PPS) routing; this puts it under the system hierarchy 8-bit MCU -> PIC18 MCU -> PIC18-Q40 sub-family -> PIC18F14Q40 specific device -> embedded microcontroller -> semiconductor IC.
The PIC18F14Q40T-I/SS operates across a wide 1.8 V to 5.5 V supply range, supports up to 18 general-purpose I/O pins, and includes DMA, UART, SPI, I2C, and 16-bit PWM peripherals that simplify designs previously requiring multi-chip analog front-ends. The 12-bit ADC2 with computation engine offloads averaging, filtering, oversampling, and threshold comparison from the core, which reduces firmware complexity and improves real-time response in closed-loop control.
Typical applications include industrial sensor conditioning, motor control with on-chip 16-bit PWM, IoT edge nodes, consumer HMI (keypads and segment LCD driving with peripherals), and low-power battery-powered devices leveraging the Q40 family's nanoWatt XLP sleep modes. Designers benefit from Peripheral Pin Select (PPS), which allows remapping of digital peripherals to alternate pins to simplify PCB layout and reduce routing congestion.
When designing with this part, ensure the input supply is decoupled with both bulk and high-frequency ceramic capacitors placed close to the VDD pins. The ADC2 accuracy depends on a clean analog supply; consider using an independent reference and shielded ground around analog signals to maintain 12-bit precision.
Drop-in alternatives for PIC18F14Q40T-I/SS — 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 PIC18F14Q40T-I/SS (same form factor and footprint) — differing in ADC, Package, Program Memory (Flash), PWM, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F14Q40-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F14Q40-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F06Q40-E/ST
✅ Drop-In✓ In Stock
$0.81 / Unit
View Datasheet →PIC18F14K22-I/SS
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC18F13K50-I/SS
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →PIC18F14Q40T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit CPU |
| Program Memory (Flash) | 16 KB |
| Data RAM (SRAM) | 1 KB |
| Data EEPROM | 512 bytes |
| Maximum CPU Clock Frequency | 64 MHz |
| Operating Voltage Range (VDD) | 1.8 V to 5.5 V |
| Number of I/O Pins | 18 |
| ADC | 12-bit with Computation (ADC2) |
| DAC | Two 8-bit DACs |
| PWM Channels | 16-bit PWM |
| Communication Peripherals | UART, SPI, I2C |
| Direct Memory Access (DMA) | Yes |
| Peripheral Pin Select (PPS) | Yes |
| Package | 20-pin SSOP |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Data Bus Width | 8 bit |
| RoHS Status | Compliant |
PIC18F14Q40T-I/SS Pin Configuration
| Pin 1 | RA2/AN2/DAC5REF+ — Analog input channel 2 / DAC reference +; digital I/O |
| Pin 2 | RA3/AN3/DAC5OUT — Analog input channel 3 / DAC5 output; digital I/O |
| Pin 3 | RA4/AN4/DAC6REF+ — Analog input channel 4 / DAC reference +; digital I/O |
| Pin 4 | RA5/AN5/DAC6OUT — Analog input channel 5 / DAC6 output; digital I/O |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RA6/AN6 — Analog input channel 6; digital I/O |
| Pin 7 | RA7/AN7 — Analog input channel 7; digital I/O |
| Pin 8 | RB0/AN8 — Analog input channel 8; digital I/O |
| Pin 9 | RB1/AN9/CWG1FLT — Analog input channel 9; CWG fault input; digital I/O |
| Pin 10 | RB2/AN10/CWG1IN — Analog input channel 10; CWG input; digital I/O |
| Pin 11 | RB3/AN11/CWG1OUTA — Analog input channel 11; CWG output A; digital I/O |
| Pin 12 | RB4/AN12/CWG1OUTB — Analog input channel 12; CWG output B; digital I/O |
| Pin 13 | RB5/AN13 — Analog input channel 13; digital I/O |
| Pin 14 | RB6/ICSPCLK — Programming clock / digital I/O |
| Pin 15 | RB7/ICSPDAT — Programming data / digital I/O |
| Pin 16 | VDD — Positive supply voltage (1.8 V to 5.5 V) |
| Pin 17 | VSS — Ground reference |
| Pin 18 | RA0/AN0 — Analog input channel 0; digital I/O |
| Pin 19 | RA1/AN1 — Analog input channel 1; digital I/O |
| Pin 20 | MCLR — Master clear (reset) input |
Typical Applications
PIC18F14Q40T-I/SS is suitable for 6 applications: Industrial Sensor Conditioning, Brushless DC Motor Control, IoT Edge Sensor Nodes, Consumer HMI Keypad / Lighting, Automotive Cabin Modules, Low-Cost Data Acquisition Loggers.
Industrial Sensor Conditioning
The PIC18F14Q40T-I/SS's 12-bit ADC2 with computation engine and 1.8-5.5 V supply make it well-suited for industrial sensor signal conditioning. DMA offloads ADC averaging and threshold-comparison tasks from the CPU, while Peripheral Pin Select (PPS) lets the designer route digital peripherals to any available pin, simplifying the PCB layout around sensor connector headers. Operating at 64 MHz and -40 C to +85 C industrial range, the part handles thermocouple, strain-gauge, and process-current loops with predictable low-latency response. Two on-chip 8-bit DACs provide biasing and setpoint references without external parts.
Recommended
Brushless DC Motor Control
The 16-bit PWM channels and DMA support of the PIC18F14Q40T-I/SS enable compact brushless DC (BLDC) motor control loops. The CCP/PWM peripheral can drive three-phase FET half-bridges with center-aligned complementary outputs and configurable dead time, while DMA pipelines current-sense ADC samples into RAM without CPU intervention. ADC2's computation engine automates commutation timing calculations, reducing firmware complexity. The 1.8-5.5 V range supports direct battery or USB-powered designs, and the 20-pin SSOP keeps small-form-factor motor boards feasible.
Recommended
IoT Edge Sensor Nodes
Battery-powered IoT edge nodes benefit from the PIC18F14Q40T-I/SS's nanoWatt XLP sleep modes combined with ADC2 threshold-triggered wake from deep sleep. The 12-bit ADC supports low-side battery voltage measurement, environmental sensor reads, and threshold-triggered interrupts, while DMA reduces the wake-and-process duty cycle. UART/SPI/I2C peripherals interface to common radios and sensors without external glue logic, and PPS allows remapping digital signals to share pins with the analog sensor interface - shrinking the BOM and PCB real estate for coin-cell and energy-harvesting node designs.
Recommended
Consumer HMI Keypad / Lighting
The PIC18F14Q40T-I/SS's 16-bit PWM with DMA and Interrupt-on-Change I/O pins deliver smooth dimming and debounce-free keypad scanning for consumer HMI subassemblies. A two-wire I2C bus drives LED drivers or segment displays, while the high-speed ADC scans a resistive touch or potentiometer inputs. Operating at 1.8-5.5 V, the part fits both cell-phone accessory (3.3 V) and appliance (5 V) rails. PPS eliminates the need for wide package variants across product families - one chip fits many SKUs.
Recommended
Automotive Cabin Modules
For non-safety automotive cabin electronics (HVAC controls, lighting, generic body controllers), the PIC18F14Q40T-I/SS's wide operating range, robust peripherals, and Microchip's automotive-grade silicon heritage provide stable operation across 12 V battery transients with proper external regulation. The 12-bit ADC reads automotive sensors like temperature and potentiometer wipers while DMA maintains CAN/LIN-friendly timing. For under-the-hood or safety-critical modules, designers should migrate to AEC-Q100 qualified devices; the -E variant's +125 C operation extends usability into warmer cabin environments.
Recommended
Low-Cost Data Acquisition Loggers
The combination of 16 KB Flash, 1 KB SRAM, 512 bytes EEPROM, DMA, and ADC2 makes the PIC18F14Q40T-I/SS a strong fit for low-cost portable data loggers. ADC2's computation engine can autonomously accumulate readings to threshold, freeing CPU cycles for time-stamping and UART dump. The on-chip 8-bit DACs provide stimulus for ratiometric measurements, while PPS keeps the BOM to a single chip plus a UART bridge. With EEPROM for non-volatile parameter storage and 16-bit PWM for fan/timer interfaces, a complete 4-channel logger fits in < 1 square inch of PCB.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F14Q40T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F14Q40-I/SS | PIC18F14Q40-E/SS | PIC18F06Q40-E/ST | PIC18F14K22-I/SS | PIC18F13K50-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SSOP | 20-pin SSOP (same) | 20-pin SSOP (same) | 20-pin TSSOP (footprint-compatible) | 20-pin SSOP (same) | 20-pin SSOP (same) |
| Program Memory (Flash) | 16 KB | 16 KB | 16 KB | 8 KB | 16 KB | 8 KB |
| Data RAM | 1 KB | 1 KB | 1 KB | 1 KB | 512 B | 768 B |
| Maximum Clock Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 48 MHz |
| ADC | 12-bit ADC2 with Computation | 12-bit ADC2 with Computation | 12-bit ADC2 with Computation | 12-bit ADC2 with Computation | 10-bit ADC (no Computation engine) | 10-bit ADC |
| DMA Support | Yes | Yes | Yes | Yes | No | No |
| Peripheral Pin Select (PPS) | Yes | Yes | Yes | Yes | No | No |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
Key Differentiators
- ADC2 with on-chip Computation engine reduces firmware complexity vs legacy 10-bit ADC (vs PIC18F14K22-I/SS)
- Hardware DMA channels for autonomous peripheral-to-memory data movement (vs PIC18F13K50-I/SS)
- Peripheral Pin Select (PPS) allows digital peripheral pin remapping post-production (vs PIC18F14K22-I/SS)
- NanoWatt XLP ultra-low-power sleep modes for battery-friendly designs (vs PIC18F14K22-I/SS)
Design Notes
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin and a bulk 1-10 uF capacitor in parallel; multiple VDD pins are typically provided on the SSOP package and should each be decoupled separately. For ADC2 accuracy, use a separate AVDD pin (if present) tied directly to VDD through a ferrite bead or filter, and place the analog ground return close to AVDD to minimize switching noise coupling. Sleep currents at room temperature are in the nanoWatt XLP range, but external pull-ups and pull-downs on I/O must be considered in the total sleep budget.
Use continuous ground and power planes on the layer directly below the SSOP package to minimize loop inductance. Route analog sensor inputs adjacent to each other and away from PWM and digital switching traces - crosstalk into ADC inputs degrades effective resolution. MCLR should be tied to VDD through a 10 kohm resistor with a 100 nF capacitor on the reset line for in-circuit programming reliability and brown-out noise immunity.
Do not assume the ADC input range is the full 0-VDD without reading the datasheet's ANSEL/ADCON configuration - some analog pins are shared with digital peripherals and must be explicitly configured as analog. Watch the maximum injection current into analog pins; voltages exceeding VDD by more than 0.3 V can cause latch-up. When migrating from PIC18F14K22 to PIC18F14Q40, ensure your firmware accounts for the 12-bit ADC (vs 10-bit) and re-tunes any assumptions built around ADC counts rather than computed values. PPS must be unlocked before any digital pin-remapping change and locked again after.
Compliance Information
Industrial-grade MCU not AEC-Q100 qualified; Microchip PIC18F14Q40 is RoHS and REACH compliant per Microchip product page and DigiKey environmental data.
