PIC18F27Q43-E/SS - 8-bit 64MHz 128KB Flash MCU | Microchip
MPN: PIC18F27Q43-E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.16 | $3.16 |
| 10 | $2.84 | $28.40 |
| 100 | $2.36 | $236.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.78 | $1,780.00 |
PIC18F27Q43-E/SS Overview
An 8-bit microcontroller (MCU) is a Von-Neumann or Harvard-architecture processor that fetches, decodes, and executes instructions from on-chip program memory using an 8-bit data path. It is the workhorse of embedded control - a microcontroller is a self-contained computer on a single silicon die that includes CPU, non-volatile program memory, volatile data memory, peripherals, and interrupt logic. The PIC18F family sits in the high-performance tier of Microchip's 8-bit lineup, above PIC16F (mid-range) and below PIC24/dsPIC (16-bit), making it the natural choice for real-time control with deterministic interrupt latency and C-friendly instruction set.
Key features include XLP (eXtreme Low Power) technology for sub-microamp sleep current, functional-safety (FuSa) diagnostics support, and a vectored interrupt controller with fixed three-cycle latency. Communication peripherals include I2C, SPI, UART with LIN, and CAN FD (on selected variants). The on-chip ADCC automates capacitive voltage divider (CVD) acquisition for advanced touch sensing.
Architecturally, the Q43 family introduces new on-chip fabric that lets CLCs, PWMs, and the ADCC interconnect without CPU intervention - a hallmark of Core Independent Peripherals. This offloads deterministic timing tasks from the core, freeing MIPS for application logic and lowering system power.
Typical applications include industrial control, automotive body and sensor nodes, IoT edge devices, capacitive touch user interfaces, LED lighting controllers, and small appliances. The wide operating voltage (1.8V-5.5V) and rich analog make it equally suited to battery-powered and line-powered designs.
When designing with the PIC18F27Q43-E/SS, place a 100nF decoupling capacitor within 5mm of each VDD/VSS pair and provide bulk capacitance at the regulator output. Configure unused pins as outputs low to minimize shoot-through current, and use the ADCC's oversampling modes to relax analog filter requirements.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same PIC18-Q43 family and competing 8-bit MCUs in 28-pin SSOP, and practical design notes not collected in any single manufacturer datasheet.
Drop-in alternatives for PIC18F27Q43-E/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 PIC18F27Q43-E/SS (same form factor and footprint) — differing in ADC, PWM, Program Memory (Flash), Comparators, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F27Q43-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F27Q43-E/SP
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC18F27Q43-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F25Q43-I/SS
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC18F26Q43-I/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC18F27Q43-E/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 (8-bit) |
| Family | PIC18F27/47/57Q43 |
| Program Memory (Flash) | 128 KB (128K x 8) |
| Data SRAM | 8 KB |
| EEPROM | 1 KB |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Operating Voltage (VDD) | 1.8 V to 5.5 V |
| Package | 28-pin SSOP (5.30 mm body) |
| Mounting Type | Surface Mount |
| ADC | 12-bit ADCC (with Computation, CVD) |
| DAC | 8-bit DAC |
| PWM | Three 16-bit dual PWMs (six outputs) |
| DMA Controllers | 6 |
| Configurable Logic Cells (CLC) | Yes |
| Comparators | Yes |
| Communication | I2C, SPI, UART (LIN), CAN FD (variant-dependent) |
| XLP (eXtreme Low Power) | Yes |
| Functional Safety (FuSa) Support | Yes |
| Operating Temperature Range | -40C to +125C (E = Extended) |
| RoHS Status | Compliant |
PIC18F27Q43-E/SS Pin Configuration
| Pin 1 | RA5/MCLR — General-purpose I/O / Master Clear (Reset) input; weak pull-up enabled by configuration |
| Pin 2 | RA0 — General-purpose I/O; analog-capable; CCP/PWM output option |
| Pin 3 | RA1 — General-purpose I/O; analog-capable |
| Pin 4 | RA2 — General-purpose I/O; analog-capable |
| Pin 5 | RA3 — General-purpose I/O; analog-capable |
| Pin 6 | RA4 — General-purpose I/O; analog-capable |
| Pin 7 | RA5 — General-purpose I/O; analog-capable |
| Pin 8 | RE0 — General-purpose I/O |
| Pin 9 | RE1 — General-purpose I/O |
| Pin 10 | RE2 — General-purpose I/O |
| Pin 11 | VDD — Positive supply voltage (1.8V-5.5V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | RA7 — General-purpose I/O; CLKIN option |
| Pin 14 | RA6 — General-purpose I/O; CLKOUT option |
| Pin 15 | RC0 — General-purpose I/O; analog-capable |
| Pin 16 | RC1 — General-purpose I/O; analog-capable |
| Pin 17 | RC2 — General-purpose I/O; analog-capable |
| Pin 18 | RC3 — General-purpose I/O; analog-capable; SCL option |
| Pin 19 | RC4 — General-purpose I/O; analog-capable; SDA option |
| Pin 20 | RC5 — General-purpose I/O; analog-capable |
| Pin 21 | RC6 — General-purpose I/O; analog-capable |
| Pin 22 | RC7 — General-purpose I/O; analog-capable |
| Pin 23 | RB0 — General-purpose I/O; analog-capable |
| Pin 24 | RB1 — General-purpose I/O; analog-capable |
| Pin 25 | RB2 — General-purpose I/O; analog-capable |
| Pin 26 | RB3 — General-purpose I/O; analog-capable |
| Pin 27 | RB4 — General-purpose I/O; analog-capable |
| Pin 28 | RB5/PGD — General-purpose I/O / ICSP data line |
Typical Applications
PIC18F27Q43-E/SS is suitable for 6 applications: Capacitive Touch User Interface, Industrial Sensor Node / PLC Module, LED Lighting Controller, Small Appliance Motor Control, Automotive Body and Sensor Module, IoT Edge Sensor / Battery-Powered Device.
Capacitive Touch User Interface
The PIC18F27Q43-E/SS is purpose-built for capacitive touch user interfaces through its 12-bit ADCC with hardware Capacitive Voltage Divider (CVD). The ADCC automates charge accumulation, oversampling, averaging, and threshold detection, so a single MCU can scan 12-24 touch electrodes without CPU intervention. Combined with six DMA controllers that move touch samples directly to memory and Configurable Logic Cells (CLCs) that generate acquisition timing, the Q43 replaces an external touch controller. Engineers deploy it in white-goods control panels, industrial HMI keypads, and consumer appliances where mechanical buttons are replaced by sleek touch sliders and proximity sensors.
Recommended
Industrial Sensor Node / PLC Module
The PIC18F27Q43-E/SS integrates a 64MHz CPU, 128KB Flash, and functional-safety (FuSa) diagnostics that make it well-suited to industrial 4-20mA sensor nodes, distributed PLC I/O modules, and process-control edge devices. Its 12-bit ADCC delivers 12-bit conversion accuracy with hardware oversampling, while CAN FD (on Q43) enables robust multi-drop fieldbus communication. The XLP low-power modes drop the sleep current below 1uA, suiting battery-backed transducers. With six DMA channels, multiple ADC scans run without CPU load, so the core can handle Modbus TCP or IO-Link communication stacks in parallel.
Recommended
LED Lighting Controller
The PIC18F27Q43-E/SS drives multi-channel LED lighting with its three 16-bit dual PWMs (six PWM outputs total), 12-bit ADCC for color-mixing feedback, and DMA channels that update PWM duty cycles without CPU intervention. The CLCs generate blanking, dead-time, and fault-trigger logic to protect LED strings from over-current and thermal runaway. Designers use it in architectural dimmers, RGBW color-tunable luminaires, horticultural grow lights, and automotive interior mood lighting. The wide 1.8V-5.5V supply supports direct battery operation in 2-cell Li-ion portable fixtures.
Recommended
Small Appliance Motor Control
The PIC18F27Q43-E/SS controls small brushed DC, BLDC, and stepper motors in small appliances with its three 16-bit dual PWMs, configurable CLCs that synthesize complementary PWM with dead time, comparators for current sensing, and a 12-bit ADCC for back-EMF and stall detection. Typical targets include wash-machine pumps, dishwasher dispensers, kitchen blenders, vacuum fans, and HVAC damper actuators. The six DMA controllers move sensor data into PWM control registers automatically, enabling sensorless FOC loops without CPU overhead. With 128KB Flash, complete motor-control firmware fits comfortably.
Recommended
Automotive Body and Sensor Module
The PIC18F27Q43-E/SS operates across -40C to +125C (E suffix) and integrates CAN FD, LIN UART, and functional-safety diagnostics that simplify ISO 26262-style body-electronics designs. Automotive applications include seat-control modules, mirror controllers, HVAC blend-door actuators, RKE receivers, and lighting body controllers. Its Core Independent Peripherals (DMA, CLC, ADCC) offload the CAN/LIN message handling and sensor scanning from the CPU. Note: this is not AEC-Q100 qualified - for AEC-Q100 qualified 8-bit automotive MCUs see the PIC18FxxKxx-Q1 family; the PIC18F27Q43-E/SS is suitable for non-safety-critical body electronics only.
Recommended
IoT Edge Sensor / Battery-Powered Device
The PIC18F27Q43-E/SS combines XLP (eXtreme Low Power) sleep modes with DMA-driven wake-up scanning, making it suitable for battery-powered IoT edge sensors such as wireless thermostats, water-leak detectors, asset trackers, and wearable health bands. The 12-bit ADCC scans battery voltage, temperature, and analog sensors while the CPU stays asleep, and the CLCs generate wake triggers. The 128KB Flash hosts full TCP/IP or LoRaWAN stacks via UART-attached transceivers. Operating voltage down to 1.8V supports direct coin-cell and single-cell Li-ion operation, with sleep current under 1uA to maximize battery life.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F27Q43-E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F27Q43-I/SS | PIC18F27Q43-E/SP | PIC18F27Q43-E/SO | PIC18F25Q43-I/SS | PIC18F26Q43-I/SS |
|---|---|---|---|---|---|---|
| Package | 28-pin SSOP | 28-pin SSOP - same | 28-pin SPDIP - through-hole | 28-pin SOIC - same footprint | 28-pin SSOP - same | 28-pin SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB - same | 128 KB - same | 128 KB - same | 64 KB (-50%) | 64 KB (-50%) |
| SRAM | 8 KB | 8 KB - same | 8 KB - same | 8 KB - same | 4 KB (-50%) | 8 KB - same |
| Maximum CPU Speed | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS - same | 64 MHz / 16 MIPS - same | 64 MHz / 16 MIPS - same | 64 MHz / 16 MIPS - same | 64 MHz / 16 MIPS - same |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V - same | 1.8 V to 5.5 V - same | 1.8 V to 5.5 V - same | 1.8 V to 5.5 V - same | 1.8 V to 5.5 V - same |
| DMA Controllers | 6 | 6 - same | 6 - same | 6 - same | 6 - same | 6 - same |
| Temperature Grade | E (Extended, -40C to +125C) | I (Industrial, -40C to +85C) | E (Extended, -40C to +125C) - same | E (Extended, -40C to +125C) - same | I (Industrial, -40C to +85C) | I (Industrial, -40C to +85C) |
Key Differentiators
- Six DMA controllers on an 8-bit PIC (vs PIC18F26K83-I/SS)
- Functional-safety (FuSa) diagnostics support (vs PIC18F27Q10-I/SO)
- 12-bit ADCC with hardware CVD (vs PIC18F26K40-E/SO)
Design Notes
Estimated: at 64MHz active, VDD=3.3V, the PIC18F27Q43-E/SS consumes roughly 8mA. Place a 100nF X7R decoupling capacitor within 5mm of each VDD/VSS pair, and add a 4.7uF bulk capacitor at the regulator output. For battery applications, use the IDLE mode (~1.4mA) or the XLP Sleep mode (sub-1uA with RTCC and WDT running) - never leave floating inputs because floating CMOS inputs can source tens of microamps through the ESD structure.
The 28-pin SSOP has a 0.65mm pin pitch - ensure your PCB house can manufacture 0.4mm-wide traces with 0.15mm spacing under the package, and use ENIG surface finish for fine-pitch reliability. Route the ICSP PGD/PGC pair as a length-matched differential pair to the programming header; mismatched lengths cause programming failures on long traces. Keep the MCLR pin trace short and place the 10k MCLR pull-up within 10mm of the pin to avoid false resets during ESD strikes.
When routing the 64MHz HFINTOSC, keep traces away from the analog inputs to avoid coupling into the ADCC samples. For capacitive touch electrodes, dedicate one ground pour island around the touch area, stitched with 1mm vias on a 5mm grid, to provide a stable reference. The ADCC's CVD mode is sensitive to VDD ripple - keep the analog supply below 10mV peak-to-peak in the 100kHz-1MHz band, which typically requires a ferrite bead between digital and analog supplies.
Critical: Do not reuse the PIC18F27Q43-E/SS configuration bits from an old project without verifying CONFIG4 settings - especially WDT, BOR, and LVP enable, which can lock you out of low-voltage ICSP. The Q43's PPS (Peripheral Pin Select) registers must be unlocked and configured before analog or communication peripherals will function on non-default pins. Always define unused pins as OUTPUT LOW in firmware to minimize shoot-through current in the input ESD structure.
Compliance Information
RoHS and REACH compliant per Microchip product page (microchip.com/en-us/product/PIC18F27Q43). Lead-free and halogen-free per Microchip Material Declaration. This part is NOT AEC-Q100 qualified; for AEC-Q100 qualified 8-bit MCUs see the PIC18FxxKxx-Q1 family. E temperature grade is Extended (-40C to +125C), not automotive-qualified.
