PIC18F16Q40T-I/SS - 8-bit 64MHz 64KB Flash MCU | Microchip
MPN: PIC18F16Q40T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.69 | $16.90 |
| 100 | $1.48 | $148.00 |
| 500 | $1.32 | $660.00 |
| 1,000 | $1.18 | $1,180.00 |
PIC18F16Q40T-I/SS Overview
The PIC18-Q40 family belongs to the broader PIC18 8-bit RISC microcontroller lineage, which sits in the hierarchy: 8-bit microcontroller -> microcontroller unit (MCU) -> embedded processor -> semiconductor. PIC18 devices use an enhanced Harvard architecture with a RISC instruction set optimized for deterministic interrupt response and C-friendly addressing, making them well suited to mixed analog/digital signal-chain applications that must remain responsive while servicing sensors, communication stacks, and PWMs.
Key features include 64 MHz operation from a 2.5 V / 3.3 V / 5 V supply, a 12-bit ADCC capable of automated averaging, threshold comparison, and oversampling, two 8-bit DAC outputs, multi-channel 16-bit PWMs with complementary and dead-band modes, up to four CLC blocks for hardware glue logic, a DMA controller that offloads core-driven memory copies, and standard PIC18 peripherals such as EUSART, I2C, SPI, and multiple timers. The 20-pin SSOP exposes 17 I/O lines, giving designers enough analog and digital channels for typical sensor-node designs.
Architecturally, the device uses the enhanced PIC18 core with 16-bit instructions, a 31-level hardware stack, a hardware multiplier, and a vectored interrupt controller. Memory protection, an on-chip debugger (ICD), and Microchip's MPLAB X toolchain compatibility shorten firmware development cycles for embedded engineers.
Typical applications include industrial sensor conditioning, motor and lighting control loops, IoT edge nodes, consumer white goods, and battery-powered instrumentation that benefits from the ADCC + DAC + 16-bit PWM combination.
When designing with the PIC18F16Q40T-I/SS, observe the absolute maximum ratings in the datasheet (e.g. VDD max, ESD ratings), decouple VDD/VSS with 100 nF + bulk capacitors placed within 5 mm of the pins, and route the analog supply separately from noisy digital I/O to fully exploit the 12-bit ADCC SNR.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides, helping procurement and engineering teams shortlist and qualify the part faster.
Drop-in alternatives for PIC18F16Q40T-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 PIC18F16Q40T-I/SS (same form factor and footprint) — differing in DAC, Package, PWM, ADC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F16Q40-I/P
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC18F16Q40-E/SO
✅ Drop-In✓ In Stock
$1.2 / Unit
View Datasheet →PIC18F15Q41-I/SS
✅ Drop-In✓ In Stock
$0.95 / Unit
View Datasheet →PIC18F15Q41T-I/SO
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC18F14Q40T-I/SS
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →PIC18F16Q40T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC (enhanced Harvard) |
| Maximum CPU Frequency | 64 MHz |
| Flash Program Memory | 64 KB (64K x 8) |
| SRAM | 4 KB |
| EEPROM | 512 bytes |
| ADC | 12-bit ADC with Computation (ADCC) |
| DAC | 2 x 8-bit DAC |
| PWM | 16-bit PWM, multi-channel |
| DMA | Yes (Direct Memory Access) |
| Configurable Logic Cells (CLC) | Yes |
| Supply Voltage (VDD) | 2.5 V / 3.3 V / 5 V |
| Operating Temperature Range | -40C to +85C (Industrial, -I) |
| Package | 20-SSOP (5.30 mm body) |
| Mounting Type | Surface Mount (Tape & Reel, -T) |
| RoHS Status | Compliant |
PIC18F16Q40T-I/SS Pin Configuration
| Pin 1 | RA0 — Analog/Digital I/O - AN0 |
| Pin 2 | RA1 — Analog/Digital I/O - AN1 |
| Pin 3 | RA2 — Analog/Digital I/O - AN2 / DAC1OUT |
| Pin 4 | RA3 — Analog/Digital I/O - AN3 / DAC2OUT |
| Pin 5 | RA4 — Analog/Digital I/O - AN4 |
| Pin 6 | RA5 — Analog/Digital I/O - AN5 |
| Pin 7 | RA6 — Digital I/O - OSCCLK |
| Pin 8 | RA7 — Digital I/O - OSCXTAL |
| Pin 9 | VSS — Ground |
| Pin 10 | VDD — Positive supply |
| Pin 11 | RB0 — Digital I/O - AN12 |
| Pin 12 | RB1 — Digital I/O - AN10 |
| Pin 13 | RB2 — Digital I/O - AN8 |
| Pin 14 | RB3 — Digital I/O - AN9 |
| Pin 15 | RB4 — Digital I/O - AN11 |
| Pin 16 | RB5 — Digital I/O - AN13 |
| Pin 17 | RB6 — Digital I/O - ICSPCLK |
| Pin 18 | RB7 — Digital I/O - ICSPDAT |
| Pin 19 | RC0 — Digital I/O |
| Pin 20 | RC1 — Digital I/O |
Typical Applications
PIC18F16Q40T-I/SS is suitable for 6 applications: Industrial Sensor Conditioning, Motor and Lighting Control Loops, IoT Edge / Sensor Nodes, Consumer White Goods and Appliances, Battery-Powered Instrumentation, Smart Lighting and RGBW Drivers.
Industrial Sensor Conditioning
The PIC18F16Q40T-I/SS is a strong fit for industrial sensor-conditioning front-ends because its 12-bit ADC with Computation (ADCC) handles automated averaging and oversampling while the DMA controller streams conversion results without CPU intervention. With 64 KB Flash and 4 KB SRAM it can host protocol stacks (Modbus, IO-Link device) plus signal-processing code. The dual 8-bit DACs let the same MCU provide excitation or setpoint outputs. Compared to a smaller PIC18F14Q40, this part leaves room for richer calibration routines without leaving the 20-SSOP footprint. Add a TVS-protected front end, 100 nF + 10 uF decoupling on VDD, and route analog traces away from PWM edges to fully exploit the ADCC SNR.
Recommended
Motor and Lighting Control Loops
For DC, stepper, and low-power BLDC motor or LED-lighting control loops, the PIC18F16Q40T-I/SS delivers 16-bit PWMs with complementary outputs and dead-band insertion, DMA-driven duty-cycle updates, and a 64 MHz core capable of running PID or trapezoidal commutation in firmware. The 20-pin SSOP exposes enough I/O for hall-sensor inputs, fault flags, and an RS-485 link. Versus the PIC18F14Q40T-I/SS, this part provides four times the Flash, giving headroom for application-specific firmware plus a bootloader. For higher-voltage drives, pair with gate drivers such as the Microchip MCP14 family; the MCU handles logic and current sensing through the ADCC.
Recommended
IoT Edge / Sensor Nodes
The PIC18F16Q40T-I/SS is well suited to IoT edge nodes because its wide 2.5 V to 5 V supply range works directly with single-cell Li-ion and 3.3 V rails, while the CLC and DMA reduce CPU wake time and extend battery life. The 64 KB Flash hosts TLS or LoRaWAN stacks plus application firmware, and the 4 KB SRAM is large enough for buffering sensor bursts. The 20-SSOP footprint matches the Q40 family's PCB reference designs, enabling layout reuse. Compared to the 14-pin PIC18F14Q40T-I/SS, the 16Q40 adds five extra I/O, useful for multi-sensor boards, at the cost of roughly 1.5x die area - a worthwhile trade for richer nodes.
Recommended
Consumer White Goods and Appliances
Consumer white-goods designs benefit from the PIC18F16Q40T-I/SS because the 16-bit PWMs drive TRIAC phase control or MOSFET dimming, the dual 8-bit DACs set bias or reference levels for analog front-ends, and the CLC implements custom glue logic without an extra CPLD. The 64 KB Flash covers the largest HMI state-machine tables and capacitive-touch libraries available for PIC18. Industrial -40C to +85C operation handles under-cabinet and garage environments. The 20-SSOP package is pin-compatible with the SOIC-20 PIC18F16Q40-E/SO for extended-temperature models, allowing one PCB to be reworked into both SKUs.
Recommended
Battery-Powered Instrumentation
Battery-powered instruments such as portable gas analyzers, field multimeters, and handheld medical tools leverage the PIC18F16Q40T-I/SS because DMA + CLC keep the CPU idle while the ADC samples, reducing average current draw. The 2.5 V minimum VDD works with depleted cells, and the 5 V maximum supports USB-powered charging. With 64 KB Flash the MCU can store lookup tables and calibration data that would otherwise require an external EEPROM. Compared to the PIC18F14Q40T-I/SS (16 KB Flash), this part doubles program memory at a slight cost premium, often worthwhile for instruments where code size grows quickly with calibration profiles.
Recommended
Smart Lighting and RGBW Drivers
RGBW smart-lighting designs use the PIC18F16Q40T-I/SS to drive four 16-bit PWM channels for dimming, plus an I2C or SPI link to a wireless MCU such as the RN2483 or ATWINC1500. The CLC blocks generate fade curves without software overhead, while DMA updates duty registers from RAM tables so color transitions appear smooth. The 4 KB SRAM buffers frame buffers for chasing effects. The 20-SSOP footprint fits in narrow LED-strip PCBs and is pin-compatible with the 14-pin PIC18F14Q40T-I/SS for entry-level SKUs, allowing one BOM to scale across product lines.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F16Q40T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F16Q40-I/P | PIC18F16Q40-E/SO | PIC18F15Q41-I/SS | PIC18F15Q41T-I/SO | PIC18F14Q40T-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-PDIP (same die, tube) | 20-SOIC (same die) | 20-SSOP - same | 20-SOIC | 20-SSOP family variant |
| Flash Memory | 64 KB | 64 KB | 64 KB | 32 KB | 32 KB | 16 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 2 KB | 1 KB |
| ADC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC |
| PWM Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| DMA | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C (-I) | -40C to +85C (-I) | -40C to +125C (-E) | -40C to +85C (-I) | -40C to +85C (-I) | -40C to +85C (-I) |
| Approx Unit Price @1000 (USD) | 1.18 | 1.22 | 1.42 | 1.05 | 1.08 | 0.95 |
Key Differentiators
- Largest Flash and RAM in the PIC18-Q40 20-pin tier (vs PIC18F14Q40T-I/SS)
- Full Q40 peripheral set: dual 8-bit DAC + 16-bit PWM + ADCC + DMA + CLC (vs PIC18F15Q41T-I/SO)
- Industrial -40C to +85C grade on the SSOP-20 footprint (vs PIC18F16Q40-E/SO)
Design Notes
Place a 100 nF X7R ceramic decoupling capacitor within 5 mm of each VDD/VSS pair on the 20-SSOP, and add a single 10 uF bulk capacitor on the main VDD rail. The PIC18F16Q40T-I/SS operates from 2.5 V to 5 V; for noisy USB or 24 V industrial rails, add a ferrite bead between the upstream LDO and the MCU VDD. Power-up rise time should follow the datasheet's specification - too slow a rise can trigger brown-out resets.
Route analog ADCC traces (RA0-RA5, RB0-RB5 where used as analog) away from PWM outputs, switching nodes, and digital I/O to minimize coupled noise. Keep the analog ground return under the analog section and stitch to the main ground at one point only. Place the ICSP test points (RB6/RB7) on the board edge so a debug header can be attached without removing parts. Follow Microchip's TB3078 'Tips and Tricks for PIC18' for SDO/SDI routing on SPI peripherals.
Do not exceed VDD max (typically 5.5 V including transients) or source/sink more than 25 mA per pin (refer to datasheet absolute maximums). Configuration bits must be set for oscillator source and code protection - leaving them at default can lock the device. When migrating from PIC18F15Q41 to PIC18F16Q40T-I/SS in-circuit, verify that code fit (Flash/RAM) does not exceed the smaller target's memory budget; the Q41 is a Flash downgrade, not a direct substitute.
Estimated: at 64 MHz with all peripherals active, the PIC18F16Q40T-I/SS in 20-SSOP draws roughly 15 mA from a 3.3 V rail, dissipating about 50 mW - well within the SSOP's ~150 C/W junction-to-ambient thermal resistance and producing a negligible 7.5C rise. The -I grade is rated to +85C ambient, giving 7.5C margin at worst case. Designers do not need a heatsink for this MCU; thermal concerns are dominated by adjacent power components.
Compliance Information
RoHS and REACH compliance per Microchip product page. AEC-Q100 not applicable - this is an industrial-grade part, not automotive. Lead-free and halogen-free per Microchip's Package Material Declaration. Conflict-minerals status per Microchip's regulatory filings.
