PIC18F26Q10-I/STX - 64KB Flash 8-bit MCU 64MHz | Microchip
MPN: PIC18F26Q10-I/STX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.65 | $2.65 |
| 10 | $2.42 | $24.20 |
| 100 | $2.18 | $218.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.74 | $1,740.00 |
| 3,000 | $1.52 | $4,560.00 |
PIC18F26Q10-I/STX Overview
Key features include the eXtreme Low Power (XLP) technology, Configurable Logic Cells (CLCs), Complementary Waveform Generator (CWG), Hardware Limit Timer (HLT), Windowed Watchdog Timer (WWDT), SCAN/CRC functional safety features, and 25 MIPS CPU performance. The 28-VQFN (4x4) compact package is suitable for space-constrained designs while exposing all peripherals through dedicated pins.
An 8-bit microcontroller (MCU) is a programmable computing device that executes instructions on 8-bit data words. The PIC18 family uses a modified Harvard RISC architecture with separate program and data buses, enabling single-cycle instruction execution. 8-bit MCUs occupy the lowest tier of the MCU hierarchy (8-bit -> 16-bit -> 32-bit), providing deterministic timing, low cost, and low power for applications where computational headroom of higher-bit MCUs is not required. They remain dominant in appliance control, sensor nodes, motor control, and industrial real-time control.
The PIC18F26Q10 silicon integrates core-independent peripherals such as CLCs and the CWG that offload logic and waveform generation from the CPU, freeing MIPS for application code. Functional Safety (FuSa) features such as Flash ECC, SRAM parity, and WWDT simplify IEC 61508 / ISO 26262 safety system development.
Typical applications include IoT sensor nodes, robust real-time control, appliance control, low-power edge sensing, touch/proximity human-machine interfaces, and motor control where 5V analog I/O and integrated digital peripherals reduce BOM cost.
When designing with this MCU, plan pin allocation for the analog/digital shared pins early because the 28-VQFN package leaves no unused pins; ensure the PCB layout exposes the ICSP/PGD/PGC pins for in-circuit programming and provides a stable VDDCORE decoupling network.
This page synthesizes DigiKey and Mouser distributor pricing, drop-in package-compatible alternatives from the PIC18-Q10 family, and practical design notes not duplicated in the Microchip datasheet.
Drop-in alternatives for PIC18F26Q10-I/STX — 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 PIC18F26Q10-I/STX (same form factor and footprint) — differing in ADC, Core Architecture, Package, Operating Temperature, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25Q10-I/STX
✅ Drop-In✓ In Stock
$1.58 / Unit
View Datasheet →PIC18F24Q10-I/STX
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC18F26Q10-I/STX
✅ Drop-In✓ In Stock
$1.52 / Unit
View Datasheet →PIC18F26Q10-E/STX
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26Q10-I/STX Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC |
| Program Memory (Flash) | 64 KB |
| Data Memory (SRAM) | 4 KB |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 64 MHz (16 MIPS, 4x PLL) |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Operating Temperature Range | -40C to +85C (Industrial, -I suffix) |
| Package | 28-pin VQFN (4x4 mm) |
| ADC | 10-bit ADC2 (with Computation) |
| DAC | 5-bit DAC |
| Timers | Hardware Limit Timer (HLT) + standard PIC18 timer modules |
| PWM / Waveform | Complementary Waveform Generator (CWG) + PWM |
| Configurable Logic | Configurable Logic Cells (CLCs) |
| Watchdog | Windowed Watchdog Timer (WWDT) |
| Functional Safety | SCAN/CRC, Flash ECC, SRAM parity |
| Low-Power Technology | eXtreme Low Power (XLP) |
| Programming/Debug | ICSP (PGD/PGC), supports PICkit, ICD, MPLAB tools |
| RoHS Status | Compliant |
PIC18F26Q10-I/STX Pin Configuration
| Pin 1 | RA5 — I/O / ADC |
| Pin 2 | RA4 — I/O |
| Pin 3 | RA3 — I/O |
| Pin 4 | RA2 — I/O / DAC |
| Pin 5 | RA1 — I/O / DAC |
| Pin 6 | RA0 — I/O / DAC |
| Pin 7 | VSS — Ground |
| Pin 8 | VDD — Positive supply |
| Pin 9 | OSC1 — Crystal input / CLKIN |
| Pin 10 | OSC2 — Crystal output |
| Pin 11 | RB7 — I/O / ICSP PGEC |
| Pin 12 | RB6 — I/O / ICSP PGED |
| Pin 13 | RB5 — I/O |
| Pin 14 | RB4 — I/O |
| Pin 15 | RC7 — I/O |
| Pin 16 | RC6 — I/O |
| Pin 17 | RC5 — I/O |
| Pin 18 | RC4 — I/O |
| Pin 19 | RC3 — I/O |
| Pin 20 | RC2 — I/O |
| Pin 21 | RC1 — I/O |
| Pin 22 | RC0 — I/O |
| Pin 23 | RB3 — I/O |
| Pin 24 | RB2 — I/O |
| Pin 25 | RB1 — I/O |
| Pin 26 | RB0 — I/O |
| Pin 27 | RA7 — I/O / CLKIN |
| Pin 28 | RA6 — I/O / CLKOUT |
Typical Applications
PIC18F26Q10-I/STX is suitable for 6 applications: IoT Sensor Node with Edge Processing, Industrial Real-Time Control, Appliance Control (White Goods), Functional Safety Sensor Interface, Automotive Body and Comfort Electronics, Smart Home Touch and Proximity HMI.
IoT Sensor Node with Edge Processing
The PIC18F26Q10-I/STX fits battery-powered IoT sensor nodes where 5V analog sensor interfaces and ultra-low sleep current matter. XLP sleep modes drop quiescent current to the nanoamp range, while the 16 MIPS core handles on-node edge filtering. The 10-bit ADC2 with Computation performs hardware averaging without waking the CPU, and the 64 KB Flash accommodates MQTT/CoAP stacks plus sensor-fusion DSP. CLCs implement wake-on-signal logic in hardware so the firmware does not need to poll.
Recommended
Industrial Real-Time Control
The PIC18F26Q10-I/STX is optimized for real-time control loops such as PID motor drivers, solenoid controllers, and process actuators. The CWG generates complementary PWM with programmable dead-band for H-bridge motor drive, while HLT enforces hardware-level timing limits for safety. The 64 MHz CPU delivers deterministic interrupt latency, and 5V tolerance lets the part drive industrial 24V interfaces through simple transistor buffers without level shifters.
Recommended
Appliance Control (White Goods)
Washing machines, dishwashers, and HVAC controllers benefit from the PIC18F26Q10-I/STX's 5V noise immunity and integrated analog peripherals. The 10-bit ADC2 reads multiple temperature and pressure sensors simultaneously, the DAC drives analog setpoint lines, and the WWDT plus functional safety SCAN/CRC satisfy IEC 60730 Class B appliance-safety requirements. The 28-VQFN (4x4) fits tightly inside appliance control boards.
Recommended
Functional Safety Sensor Interface
Functional-safety systems such as gas detectors, safety interlocks, and medical peripherals leverage the PIC18F26Q10-I/STX's SCAN/CRC peripheral scan, Flash ECC, SRAM parity, and WWDT to meet IEC 61508 SIL 2/3 architectures. The CLCs implement safety-rated logic gating in hardware, and the HLT enforces watchdog timing. Compact 28-VQFN (4x4) lets the MCU sit inside safety enclosures with tight space constraints.
Recommended
Automotive Body and Comfort Electronics
Body controllers for lighting, seat control, and HVAC blowers use the PIC18F26Q10-I/STX because 5V tolerance directly drives automotive relay coils and LED strings. CLCs implement turn-signal sequencing without CPU load, the CWG drives MOSFET half-bridges for seat motors, and 5V ADC inputs read resistive sensor bridges. Note: this is the industrial-grade -I variant; for under-hood AEC-Q100 systems use the Q10 automotive qualified family members.
Recommended
Smart Home Touch and Proximity HMI
Touch buttons, proximity sensors, and LED-feedback controllers use the PIC18F26Q10-I/STX's CLCs and CTMU peripheral to implement capacitive touch sensing without an external touch IC. The 64 KB Flash holds UI state machines and LED-animation logic, while the 4 KB SRAM handles touch debouncing buffers. The 5V rail drives WS2812-style LED strips directly through FET buffers.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F26Q10-I/STX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25Q10-I/STX | PIC18F24Q10-I/STX | PIC18F26Q10-E/STX |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-VQFN (4x4) | 28-VQFN (4x4) - same | 28-VQFN (4x4) - same | 28-VQFN (4x4) - same |
| Flash Memory | 64 KB | 32 KB | 16 KB | 64 KB |
| SRAM | 4 KB | 2 KB | 1 KB | 4 KB |
| CPU Speed | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +125C (Extended) |
| Functional Safety Features | SCAN/CRC, WWDT, Flash ECC | SCAN/CRC, WWDT, Flash ECC | SCAN/CRC, WWDT, Flash ECC | SCAN/CRC, WWDT, Flash ECC |
| Unit Price (qty 1, as of 2026-09-27) | $2.65 | $2.32 | $2.10 | $2.85 |
| Peripherals (CLC, CWG, HLT, WWDT) | All present | All present | All present | All present |
Key Differentiators
- Largest Flash memory in the 28-pin PIC18-Q10 family (vs PIC18F25Q10-I/STX)
- Industrial temperature grade -40C to +85C (vs PIC18F26Q10-E/STX)
- Functional Safety (FuSa) peripheral set (vs PIC18F26K83-I/SS)
- 5V native operation (vs PIC18F26Q10-I/SS (28-pin SSOP variant))
Design Notes
The PIC18F26Q10-I/STX operates from 1.8V to 5.5V. Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 8) and a bulk 10 uF capacitor on the same supply rail. For battery-powered designs, leverage XLP sleep modes; the datasheet specifies nanoamp-level quiescent current in Sleep with peripherals disabled. Add a 100 kohm pull-up on MCLR if not driven by the programmer to prevent spurious resets.
The 28-VQFN (4x4) package has an exposed thermal pad (EP) underneath that must be soldered to the PCB ground plane for mechanical strength and thermal dissipation. Vias in the EP land pattern reduce thermal resistance. Route ICSP signals PGD (RB6) and PGC (RB7) with short, parallel traces and a ground guard to keep programming reliable in noisy environments.
Do not skip configuring the CONFIG words in code; the default oscillator and watchdog settings may not match your application. The analog/digital shared pins (PORTA) must have their ANSEL bits cleared to use them as digital GPIO. The 28-VQFN package leaves no unused pins, so plan the pin map before PCB layout to avoid redesign. When migrating from PIC18F26K83 code, double-check peripheral library revisions because register names changed between K83 and Q10 families.
When using the 10-bit ADC2 with Computation, place the analog input traces away from switching signals such as PWM outputs on the CWG. Use the dedicated AVSS/AVDD rails if the device exposes them; otherwise decouple VDD with a ferrite bead plus 100 nF + 10 uF. The internal voltage reference (FVR) is shared with the DAC, so enabling the DAC affects ADC FVR buffer performance.
Compliance Information
RoHS compliant and lead-free per Microchip product page. Industrial temperature grade (-I) is -40C to +85C; not AEC-Q100 qualified. Use AEC-Q100 qualified Q10 family members for automotive applications.
