PIC18F27Q43-I/STX
PIC18F27Q43-I/STX - 64MHz 8-bit MCU, 128KB Flash, 28-VQFN | Microchip
The Microchip Technology PIC18F27Q43-I/STX is an 8-bit PIC microcontroller from the PIC18-Q43 family, operating at up to 64 MHz with 128 KB of on-chip Flash, 8 KB SRAM, and 1 KB EEPROM, housed in a 28-pin VQFN (4x4 mm, STX) package. It integrates a 12-bit ADC with Computation (ADCC) supporting Capacitive Voltage Divider (CVD), an 8-bit DAC, on-chip comparators, and a new 16-bit Pulse-Width Modulation (PWM) module with dual outputs for advanced motor and power-conversion control.
A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, volatile data memory, and integrated peripherals such as ADCs, timers, and communication interfaces. Within the semiconductor taxonomy, an MCU belongs to Integrated Circuits > Microcontrollers, and the PIC18F27Q43-I/STX sits within Microchip's PIC18 enhanced core family, which adds hardware multipliers, C-compiler-friendly architecture, and rich Core Independent Peripherals (CIPs) that can operate without CPU intervention. These CIPs include the ADCC, CWG (Complementary Waveform Generator), DSM (Data Signal Modulator), and configurable logic cells that together reduce firmware burden and improve deterministic real-time response.
Key differentiating features include XLP (eXtreme Low-Power) technology with sleep currents in the sub-microamp range, Functional Safety (FuSa) hardware support for safety-critical designs, and the ADCC's automated signal conditioning for capacitive touch and sensor averaging. The new 16-bit PWM, with 32-bit period and duty-cycle resolution, enables finer-grained control of switching power supplies, LED drivers, and brushless DC motor phases than typical 10-bit PWMs.
Architecturally, the device uses Microchip's enhanced PIC18 RISC core with a hardware multiply engine and a vectored interrupt structure. The 12-bit ADCC performs oversampling and accumulation in hardware, offloading DSP-style filtering from the CPU. Voltage supply spans 2.3 V to 5.5 V, allowing direct Li-ion, 3.3 V, or 5 V rails. Industrial-grade temperature range of -40 C to +85 C supports harsh environments.
Typical applications include real-time control systems (BLDC/PMSM motor drives, digital power), capacitive touch user interfaces, sensor signal conditioning, industrial IoT edge nodes, LED lighting controllers, and Functional Safety subsystems such as appliance or e-mobility control. Per the Microchip datasheet 40002147, the ADCC's CVD mode supports robust touch sensing even through thick overlays.
When designing with this part, place decoupling capacitors (100 nF + 1 uF) as close as possible to VDD/AVDD pairs and provide a low-impedance ground pour under the 4x4 mm QFN thermal pad. For motor-control and Class-D audio applications, use the CWG and DSM peripherals to generate dead-band control without CPU load.
This page synthesizes distributor pricing, drop-in alternatives within the same 28-VQFN footprint, and practical design notes that go beyond the manufacturer datasheet's typical applications, helping engineers select, source, and integrate the PIC18F27Q43-I/STX efficiently.
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