PIC18F27Q43-E/STX - 64MHz 8-bit MCU 128KB Flash | Microchip
MPN: PIC18F27Q43-E/STX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.71 | $27.10 |
| 100 | $2.42 | $242.00 |
| 500 | $2.15 | $1,075.00 |
| 1,000 | $1.92 | $1,920.00 |
PIC18F27Q43-E/STX Overview
A PIC18 8-bit microcontroller is a Harvard-architecture RISC MCU optimized for deterministic real-time control with rich Core Independent Peripherals (CIPs). In the broader taxonomy it sits within microcontroller -> 8-bit MCU -> PIC MCU -> PIC18 family -> PIC18-Q43 sub-family. The Q43 generation specifically adds Direct Memory Access (DMA), Configurable Logic Cells (CLCs), high-resolution 16-bit PWM and the ADCC engine for hardware-averaged capacitive touch sensing.
Key features of this part include 128 KB self-programmable Flash with device information area, 8 KB SRAM, 1 KB EEPROM, six DMA channels, four CLCs, three 16-bit dual PWMs (six outputs), a 12-bit ADCC with up to 35 analog channels, two 8-bit DACs, three comparators with 5-bit DAC references, and multiple serial interfaces including UART, SPI, and I2C. Vectored interrupts with programmable base address and fixed three-cycle latency shorten interrupt response.
Architecturally, the PIC18F27Q43 uses Microchip's enhanced mid-range core with a modified Harvard bus, hardware multiplier (8x8), and a peripheral engine that offloads CIP tasks from the CPU. The ADCC performs oversampling, averaging, threshold comparison, and CVD touch decoding entirely in hardware, allowing the CPU to remain in sleep for low-power duty-cycled applications.
Typical applications are BLDC and PMSM motor control (sensorless FOC), digital power conversion (digital PFC and LLC), LED lighting drivers, capacitive touch HMI, functional-safety appliance controllers, and industrial sensor hubs. The wide 2.5 V to 5.5 V supply range simplifies interfacing to both 3.3 V and 5 V logic domains.
When designing with the PIC18F27Q43-E/STX, ensure the exposed pad is soldered to a sufficiently large thermal copper pour and that the ICSP/PGD/PGC lines include ESD protection. For functional-safety designs, the dedicated FuSa libraries and self-test routines from Microchip should be integrated per the device errata and DS00002147 datasheet. Note that the /STX suffix indicates an extended-temperature grade VQFN-28 variant; the /STX is the lower-pin-count sibling to the 40-/48-pin Q43 family members.
Drop-in alternatives for PIC18F27Q43-E/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 PIC18F27Q43-E/STX (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Program Memory (Flash), Comparators.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F27Q43-I/STX
✅ Drop-In✓ In Stock
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View Datasheet →PIC18F27Q43-E/SP
✅ Drop-In✓ In Stock
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View Datasheet →PIC18F26Q43T-I/STX
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View Datasheet →PIC18F25Q43T-I/STX
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View Datasheet →PIC18F27Q10-I/SO
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F27Q43-E/STX Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC enhanced mid-range |
| CPU Frequency (Max) | 64 MHz |
| Program Memory (Flash) | 128 KB |
| Data RAM | 8 KB |
| EEPROM | 1 KB |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature | -40 °C to +125 °C (Extended, -E) |
| Package | 28-pin VQFN (4x4 mm, /STX) |
| ADC | 12-bit ADC with Computation (ADCC) |
| DAC | 8-bit DAC (two instances) |
| Comparators | 3 with 5-bit DAC references |
| PWM Channels | 6 (three 16-bit dual PWMs) |
| DMA Controllers | 6 channels |
| Configurable Logic Cells (CLC) | 4 |
| Communication Interfaces | UART, SPI, I2C |
| Vectored Interrupts | Yes (programmable base, 3-cycle latency) |
| Functional Safety (FuSa) | Yes (XLP 18K FuSa variant) |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
PIC18F27Q43-E/STX Pin Configuration
| Pin 1 | RA0 — Bidirectional I/O with analog AN0 / comparator input |
| Pin 2 | RA1 — Bidirectional I/O with analog AN1 |
| Pin 3 | RA2 — Bidirectional I/O with analog AN2 / DAC1 output |
| Pin 4 | RA3 — Bidirectional I/O with analog AN3 / DAC2 output |
| Pin 5 | RA4 — Bidirectional I/O / analog AN4 |
| Pin 6 | RA5 — Bidirectional I/O / analog AN5 |
| Pin 7 | RA6 — Bidirectional I/O / analog AN6 |
| Pin 7 | VSS — [DATA_NEEDED: pin coordinate - pin overlap with VSS suspected for /STX] |
| Pin 8 | RA7 — Bidirectional I/O / analog AN7 |
| Pin 9 | RB0 — Bidirectional I/O / analog AN8 / IOC |
| Pin 10 | RB1 — Bidirectional I/O / analog AN9 |
| Pin 11 | RB2 — Bidirectional I/O / analog AN10 |
| Pin 12 | RB3 — Bidirectional I/O / analog AN11 |
| Pin 13 | RB4 — Bidirectional I/O / analog AN12 |
| Pin 14 | RB5 — Bidirectional I/O / analog AN13 |
| Pin 15 | RB6 — Bidirectional I/O / ICSPCLK |
| Pin 16 | RB7 — Bidirectional I/O / ICSPDAT |
| Pin 17 | VDD — Positive supply voltage |
| Pin 18 | VSS — Ground reference |
| Pin 19 | RC0 — Bidirectional I/O / analog AN14 |
| Pin 20 | RC1 — Bidirectional I/O / analog AN15 |
| Pin 21 | RC2 — Bidirectional I/O / analog AN16 |
| Pin 22 | RC3 — Bidirectional I/O / analog AN17 |
| Pin 23 | RC4 — Bidirectional I/O / analog AN18 |
| Pin 24 | RC5 — Bidirectional I/O / analog AN19 |
| Pin 25 | RC6 — Bidirectional I/O / analog AN20 |
| Pin 26 | RC7 — Bidirectional I/O / analog AN21 |
| Pin 27 | RA0 — [DATA_NEEDED: pin coordinate - duplicate RA0 suspected for 28-pin /STX] |
| Pin 28 | EP — Exposed thermal pad, must be soldered to PCB ground |
Typical Applications
PIC18F27Q43-E/STX is suitable for 6 applications: BLDC / PMSM Motor Control, Digital Power Conversion (PFC / LLC), LED Lighting Drivers, Capacitive Touch HMI, Functional-Safety Appliance Controllers, Industrial Sensor Hubs.
BLDC / PMSM Motor Control
The PIC18F27Q43-E/STX is ideal for sensorless BLDC and PMSM motor control thanks to its six 16-bit PWM outputs with center-aligned mode and dead-band generators, three analog comparators with 5-bit DAC references for BEMF zero-cross detection, and the 12-bit ADCC capable of 300 ksps for current sensing. Six DMA channels offload ADC-to-PWM register updates from the CPU, freeing MIPS for Field-Oriented Control (FOC) state-machine code. The 28-VQFN /STX package allows placement directly adjacent to the power inverter, minimizing analog loop area and improving noise immunity. Microchip's AN3477 application note and MPLAB Xpress FOC libraries reference this exact family.
Recommended
Digital Power Conversion (PFC / LLC)
The PIC18F27Q43-E/STX targets digital power conversion with 64 MHz MIPS headroom, 16-bit PWM resolution suitable for 200 kHz+ switching frequencies, and high-speed 12-bit ADCC for voltage/current feedback. Four Configurable Logic Cells (CLCs) allow designers to construct hardware fault-muxing, peak-current-mode control, and digital slope compensation without external glue logic. The 128 KB Flash accommodates state-machine lookup tables for digital PFC, while 8 KB SRAM buffers ADC sample streams through DMA. The /STX VQFN-28 footprint enables compact reference designs compatible with Microchip's dsPIC33CH digital-power ecosystem.
Recommended
LED Lighting Drivers
The PIC18F27Q43-E/STX is well suited for commercial and architectural LED drivers, providing 16-bit PWM resolution for smooth dimming curves down to 0.1% duty, plus the CLCs to implement hardware-based thermal foldback and CC/CV control loops. DMA-driven ADCC samples multiple LED-string currents with zero CPU overhead, enabling up to 8 independently-controlled channels. The 2.5 V to 5.5 V supply range accommodates both 3.3 V digital logic and 5 V analog front-end signal chains. Functional-safety libraries support IEC 60950-1 and IEC 61347 lighting-safety designs in the /STX extended-temp grade.
Recommended
Capacitive Touch HMI
The PIC18F27Q43-E/STX integrates Microchip's 12-bit ADCC with hardware-accelerated Capacitive Voltage Divider (CVD) techniques, allowing reliable multi-button and slider/sensor-wheel decoding without external components. DMA streams ADC samples directly into RAM while the CPU remains in sleep, achieving single-digit µA average current for battery-powered touch HMIs. The CIP mix (CLC, PWM, comparator) supports combined touch + LED-feedback designs in a single chip. The 28-VQFN /STX package is small enough for wearable and IoT control panels, and the -40 to +125 °C range covers automotive and industrial environments.
Recommended
Functional-Safety Appliance Controllers
The PIC18F27Q43-E/STX includes dedicated Functional-Safety (FuSa) self-test libraries, watchdog timer, windowed WDT, and cyclic-redundancy-check hardware that allow designers to meet IEC 60730 Class B appliance safety requirements. The 12-bit ADCC with hardware averaging enables redundant voltage and temperature monitoring, while CLCs can implement hardware interlocks. The extended -40 to +125 °C /STX grade and exposed thermal pad of the 28-VQFN package deliver the reliability margin required for white goods, HVAC, and kitchen-appliance controllers operating near heat sources.
Recommended
Industrial Sensor Hubs
The PIC18F27Q43-E/STX serves as a compact multi-protocol sensor hub with UART, SPI, and I2C interfaces running concurrently via DMA, plus a 12-bit ADCC for analog sensors. Four CLCs handle interrupt aggregation, sensor-fusion glue logic, and real-time response to alarm conditions without CPU intervention. The 2.5 V to 5.5 V supply range and -40 to +125 °C /STX extended-temperature operation fit industrial 4-20 mA, RS-485, and IO-Link sensor applications. The 4x4 mm VQFN footprint enables sensor PCBs with strict size constraints such as field-mountable transmitters.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F27Q43-E/STX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F27Q43-I/STX | PIC18F26Q43T-I/STX | PIC18F25Q43T-I/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 |
| Core | PIC18 8-bit RISC 64 MHz | PIC18 8-bit RISC 64 MHz | PIC18 8-bit RISC 64 MHz | PIC18 8-bit RISC 64 MHz |
| Flash | 128 KB | 128 KB | 64 KB | 32 KB |
| RAM | 8 KB | 8 KB | 8 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 256 B |
| Operating Temperature | -40 °C to +125 °C (Extended) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) |
| Functional Safety | Yes (FuSa) | Yes (FuSa) | Yes (FuSa) | No |
Key Differentiators
- Largest Flash in the 28-pin Q43 family (vs PIC18F26Q43T-I/STX)
- Extended industrial temperature grade (vs PIC18F27Q43-I/STX)
- Functional-safety libraries included (vs PIC18F27Q10-I/SO)
Design Notes
The 28-VQFN /STX package requires that the exposed thermal pad (EP) be soldered to the PCB ground plane to meet thermal and EMI specifications. Failure to solder the EP results in junction temperatures that can exceed +125 °C at full CPU load, and the device may fail to read flash reliably. Use Microchip's recommended land geometry from AN2466 and add thermal vias directly under the EP.
Place a 1 µF X7R ceramic decoupling capacitor within 3 mm of each VDD pin and a 10 µF bulk capacitor near the package. For noise-sensitive analog channels, route VDD_AN analog and VDD_DIG digital rails separately and join them at a single point near the regulator output. The PIC18F27Q43-E/STX internal LDO requires an external capacitor of 1 µF minimum on the core rail pin per the datasheet DC characteristics.
When using the 12-bit ADCC for motor-current or power-conversion sensing, keep analog traces short and surrounded by ground copper. Enable ADCC hardware averaging (AVG bit) for SNR improvement of approximately 6 dB per 4× oversample. Route PWM outputs as stripline or microstrip with characteristic impedance of 50 Ω and add 33 Ω series resistors within 5 mm of the MCU to suppress ringing on the gate-driver edges.
Compliance Information
RoHS and REACH compliance per Microchip product page; AEC-Q100 is not qualified at the -E/STX grade (use -VAO or Q43 automotive variants for AEC-Q100).
