PIC18F16Q40T-I/SO - 64KB Flash 8-bit MCU, 64MHz | Microchip
MPN: PIC18F16Q40T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.14 | $114.00 |
| 500 | $1.02 | $510.00 |
| 1,000 | $0.92 | $920.00 |
PIC18F16Q40T-I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM/EEPROM), and programmable peripherals on one die. Within the broader taxonomy, the PIC18F16Q40 belongs to the 8-bit microcontroller family, then to the general category of microcontrollers, and ultimately to embedded processors and semiconductors. The Q40 family specifically targets real-time control and sensor applications where deterministic ADC sampling, hardware PWM, and low-latency interrupt response are required - features that higher-level Cortex-M MCUs sometimes overspecify for cost-sensitive designs.
Key features of the PIC18F16Q40T-I/SO include the 12-bit ADCC with hardware averaging and threshold detection, dual 8-bit DAC outputs, up to six 16-bit PWM channels with fine-resolution duty cycle control, 10-bit ADC reference, on-chip temperature sensor, and a wide operating voltage range of 2.3V to 5.5V. The DMA engine offloads data movement from the CPU, enabling efficient ADC-to-memory transfers for sensor acquisition loops. CLCs allow glue-logic replacement with configurable AND/OR/D-FF gates routed through the silicon, reducing external component count.
The architecture is built on Microchip's enhanced Harvard PIC18 core with a modified 16-bit instruction word, providing deterministic instruction timing and dual-bus access to program and data memory. An 8x8 hardware multiplier accelerates signal-processing routines such as IIR/FIR filtering, while the vectored interrupt controller supports prioritized interrupts for motor-control and communication tasks.
Typical applications include sensor signal conditioning with digital averaging, low-cost closed-loop DC motor or LED lighting control, consumer appliances with capacitive touch interfaces, USB-to-UART bridges using the CLC and PWM modules, industrial 4-20mA sensor transmitters, and battery-powered IoT sensor nodes leveraging the 4 nA sleep current.
When designing with this MCU, prioritize peripheral pin select (PPS) remapping early in PCB layout - assigning UART, SPI, or PWM functions to available physical pins reduces the need for board respins. Also reserve the ICD pins (PGC/PGD) on dedicated trace paths for in-circuit debug without interfering with signal integrity.
This page synthesizes distributor pricing, drop-in alternatives within the same SOIC-20 footprint, and practical design notes beyond what the manufacturer datasheet alone provides, enabling faster component selection and BOM risk reduction.
Drop-in alternatives for PIC18F16Q40T-I/SO — 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 PIC18F16Q40T-I/SO (same form factor and footprint) — differing in Program Memory (Flash), ADC, DAC, Package, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F15Q40T-I/SO
✅ Drop-In✓ In Stock
$1.2 / Unit
View Datasheet →PIC18F14Q40T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F15Q41T-I/SO
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC18F14Q41T-I/SO
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →PIC18F16Q40-E/SO
✅ Drop-In✓ In Stock
$1.2 / Unit
View Datasheet →PIC18F16Q40T-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit |
| Program Memory (Flash) | 64 KB |
| SRAM | 4 KB |
| EEPROM | 512 bytes |
| Maximum CPU Clock | 64 MHz |
| Operating Voltage | 2.3 V to 5.5 V |
| ADC | 12-bit ADC with Computation (ADCC) |
| DAC | 8-bit DAC (dual) |
| PWM | 16-bit PWM (multiple channels) |
| DMA | Yes (Direct Memory Access) |
| Configurable Logic Cells (CLC) | Yes |
| Peripheral Pin Select (PPS) | Yes |
| Communication Peripherals | UART, SPI, I2C |
| Package | 20-pin SOIC |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC18F16Q40T-I/SO Pin Configuration
| Pin 1 | RA5 — I/O port A bit 5 / input to ADC |
| Pin 2 | RA4 — I/O port A bit 4 |
| Pin 3 | RA3 — I/O port A bit 3 / MCLR |
| Pin 4 | RA2 — I/O port A bit 2 |
| Pin 5 | RA1 — I/O port A bit 1 |
| Pin 6 | RA0 — I/O port A bit 0 |
| Pin 7 | VSS — Ground |
| Pin 8 | VDD — Positive supply voltage |
| Pin 9 | RA7 — I/O port A bit 7 |
| Pin 10 | RA6 — I/O port A bit 6 |
| Pin 11 | RC0 — I/O port C bit 0 |
| Pin 12 | RC1 — I/O port C bit 1 |
| Pin 13 | RC2 — I/O port C bit 2 |
| Pin 14 | RC3 — I/O port C bit 3 |
| Pin 15 | RC4 — I/O port C bit 4 |
| Pin 16 | RC5 — I/O port C bit 5 |
| Pin 17 | RC6 — I/O port C bit 6 |
| Pin 18 | RC7 — I/O port C bit 7 |
| Pin 19 | RB7 — I/O port B bit 7 / PGD |
| Pin 20 | RB6 — I/O port B bit 6 / PGC |
Typical Applications
PIC18F16Q40T-I/SO is suitable for 7 applications: Sensor Signal Conditioning and Data Acquisition, Low-Cost DC Motor Control, LED Lighting and Color Mixing, Consumer Appliance Control Boards, Industrial 4-20mA Sensor Transmitters, Battery-Powered IoT Sensor Nodes, USB-to-UART / SPI Bridge Dongles.
Sensor Signal Conditioning and Data Acquisition
The PIC18F16Q40T-I/SO is an ideal fit for sensor signal conditioning because its 12-bit ADC with Computation (ADCC) provides hardware averaging, oversampling, and threshold-based interrupts, allowing firmware-light acquisition loops. With 64KB Flash and 4KB SRAM, the MCU can buffer sensor frames while the DMA controller streams ADC samples into RAM without CPU loading. Engineers typically pair this part with thermocouples, RTDs, or strain-gauge bridges in industrial instrumentation, where the 2.3V to 5.5V supply range accommodates both 3.3V and 5V analog rails. The on-chip 8-bit DAC and CLC modules further enable closed-loop excitation control for bridge sensors.
Recommended
Low-Cost DC Motor Control
For DC motor or stepper control applications, the PIC18F16Q40T-I/SO delivers up to six 16-bit PWM channels with complementary outputs and dead-band control, which is essential for driving half-bridge MOSFET stages. Its 12-bit ADCC samples motor current through a single shunt at rates sufficient for trapezoidal commutation, while the configurable logic cells (CLC) implement hardware fault protection independent of CPU latency. Operating at 64MHz with 16 MIPS throughput, the MCU executes speed-control loops within sub-millisecond intervals, suiting small BLDC or brushed-DC drives in fans, pumps, and consumer robotics.
Recommended
LED Lighting and Color Mixing
The PIC18F16Q40T-I/SO supports multi-channel LED lighting systems by using its 16-bit PWM channels for high-resolution dimming and color-mixing without flicker artifacts. Its 12-bit ADCC monitors photodiode feedback for ambient-light compensation, while the dual 8-bit DACs can drive analog reference voltages for LED driver ICs. The PPS feature lets designers remap PWM outputs to convenient pins, simplifying PCB routing in compact RGBW fixtures. With 64KB Flash, complex color-profile and DMX-style protocol stacks fit comfortably, and the 64MHz clock rate ensures smooth PWM transitions down to sub-1% dimming levels.
Recommended
Consumer Appliance Control Boards
In consumer appliances such as coffee machines, washing machines, and small kitchen devices, the PIC18F16Q40T-I/SO provides the integrated peripherals needed for user-interface control, sensor monitoring, and actuator drive. The 12-bit ADC reads temperature, humidity, or pressure sensors; the 16-bit PWMs drive solenoids, valves, and triacs; and the UART/SPI/I2C interfaces connect to displays, keypads, or Wi-Fi modules. The 4KB SRAM and 64KB Flash easily accommodate state-machine firmware with capacitive touch libraries, while PPS routing keeps the PCB layout simple in space-constrained enclosures.
Recommended
Industrial 4-20mA Sensor Transmitters
Two-wire 4-20mA loop-powered transmitters benefit from the PIC18F16Q40T-I/SO's wide 2.3V to 5.5V operating range and low-power sleep modes. The 12-bit ADCC digitizes sensor inputs with hardware averaging, while the 8-bit DAC combined with a current-loop driver IC generates the 4-20mA output signal. The CLCs implement watchdog logic for sensor fault detection, and the 512-byte EEPROM stores calibration coefficients. With 64KB Flash available, HART or other protocol stacks can be added without an external communication ASIC.
Recommended
Battery-Powered IoT Sensor Nodes
For battery-powered IoT sensor nodes, the PIC18F16Q40T-I/SO offers sleep currents as low as a few nanoamps and fast wake-up from interrupt sources, enabling multi-year coin-cell operation. The DMA and ADCC enable sensor-data bursts without CPU intervention, while the CLC modules handle wake-on-signal logic for ultra-low standby power. The 64KB Flash accommodates over-the-air (OTA) bootloaders and application firmware, and the UART/SPI/I2C peripherals connect to LoRa, BLE, or sub-GHz radio modules. PPS flexibility simplifies routing in tight sensor-node enclosures.
Recommended
USB-to-UART / SPI Bridge Dongles
The PIC18F16Q40T-I/SO can act as a USB-to-UART or USB-to-SPI bridge when paired with an external USB transceiver, leveraging its DMA controller to move packets between endpoints and memory buffers without CPU loading. The 64KB Flash accommodates USB class firmware stacks and vendor-specific protocols, while the configurable logic cells (CLC) handle USB suspend/resume signaling. The PPS feature routes UART/SPI signals to convenient pins, simplifying dongle PCB designs that need to fit in compact enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F16Q40T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F15Q40T-I/SO | PIC18F14Q40T-I/SO | PIC18F15Q41T-I/SO | PIC18F14Q41T-I/SO | PIC18F16Q40-E/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SOIC | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin SOIC - same |
| Flash Memory | 64 KB | 32 KB | 8 KB | 32 KB | 8 KB | 64 KB |
| SRAM | 4 KB | 2 KB | 1 KB | 2 KB | 1 KB | 4 KB |
| EEPROM | 512 bytes | 256 bytes | 128 bytes | 256 bytes | 128 bytes | 512 bytes |
| Maximum CPU Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| ADC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C (Extended) |
| Operating Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
Key Differentiators
- Largest Flash in PIC18-Q40 SOIC-20 family (vs PIC18F15Q40T-I/SO)
- Full peripheral set including DMA and CLC (vs PIC18F14K22-I/SO)
- Industrial temperature grade option (vs PIC18F16Q40T-I/SO (self comparison))
Design Notes
Use Peripheral Pin Select (PPS) early in schematic capture to remap UART, SPI, and PWM functions to convenient physical pins. According to the Microchip PIC18F16Q40 family datasheet, most digital I/O pins support PPS routing, which simplifies PCB layout by allowing module assignment after pin assignment rather than before. Reserve PGC/PGD (RB6/RB7) on dedicated debug traces to keep ICD operational without interference.
Place a 0.1uF decoupling capacitor as close as possible to the VDD pin (pin 8), with a bulk 10uF tantalum or ceramic capacitor on the same supply rail. For ADC accuracy, add a 10uF + 0.1uF pair near VDD to suppress digital switching noise from coupling into the analog supply. The 2.3V to 5.5V range tolerates both 3.3V and 5V rails, but verify the brown-out reset threshold is configured for the chosen supply voltage.
Do not enable all peripherals simultaneously at full speed without verifying power-budget headroom - the MCU datasheet specifies maximum I/O current per pin and per port. When migrating from PIC18F14K22 or K50 code bases, note that the Q40 family uses different SFR names and PPS registers - existing K-series firmware will require re-mapping. Also confirm ICD3/PICkit4 compatibility before committing to PCB layout that depends on in-circuit debug.
For ADC accuracy, route analog signals away from PWM outputs and digital switching traces. According to the Microchip datasheet, the 12-bit ADCC achieves its full resolution only when the analog input source impedance is below 1 kOhm for fast sampling rates. Add an external op-amp buffer if your sensor source impedance exceeds this limit. PPS-remapped digital functions on the same pins as analog inputs will degrade ADC performance if not disabled.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose automotive-grade PIC18 variants for vehicle applications. Lead-free and halogen-free packaging per Microchip environmental compliance documentation.
