PIC18F27Q43-E/SP - 8-bit 64MHz MCU, 128KB Flash, 28-SPDIP | Microchip
MPN: PIC18F27Q43-E/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.94 | $2.94 |
| 10 | $2.72 | $27.20 |
| 100 | $2.45 | $245.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.92 | $1,920.00 |
PIC18F27Q43-E/SP Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM/EEPROM), and peripherals on one die; the 8-bit PIC18 family uses an enhanced Harvard RISC architecture that excels at deterministic, bit-manipulation-heavy control tasks. Within the broader taxonomy, this part is an 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. PIC18F parts sit between the baseline PIC10/12/16 and the 16-bit dsPIC/PIC24 families, balancing code density, peripheral richness, and ease of use.
Key features include XLP (eXtreme Low Power) technology for battery-friendly designs, hardware-Core Independent Peripherals (CIPs) for offloading tasks from the CPU, and configurable logic cells that replace discrete glue logic. Functional Safety (FuSa) features simplify IEC 61508 / ISO 26262 system designs, while 12-bit ADCC and high-resolution PWM make the part well suited to motor, power conversion, and lighting control.
Architecturally, the device pairs a 16-bit instruction word with an 8-bit data path, executing most instructions in a single cycle thanks to the pipelined Harvard bus. The internal oscillator, MRAM/MIP latch, DMA-style memory-to-peripheral interconnects, and zero-cross detection reduce external component count while improving EMI performance in motor and lighting loops.
Typical applications include industrial motor control and variable-frequency drives, switched-mode power supplies (SMPS) and digital lighting (DALI, DMX), capacitive touch human-machine interfaces (HMI), functional-safety appliances, and battery-powered IoT nodes. Designers choose this part when they need deterministic 8-bit control with rich analog and touch peripherals in a hobbyist-friendly DIP package.
When designing with the PIC18F27Q43-E/SP, prefer the -E (extended) -40C to +125C grade for industrial exposure, and reserve the -I (industrial) -40C to +85C grade for cost-sensitive consumer designs. Verify the SPDIP footprint matches your PCB socket; the Q43 family also ships in SOIC, SSOP, QFN and TQFP variants for layout flexibility.
This page synthesizes Microchip datasheet parameters, distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F27Q43-E/SP — 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/SP (same form factor and footprint) — differing in ADC, Package, Operating Temperature, Mounting Type, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F27Q43-I/SP
✅ Drop-In✓ In Stock
$2.46 / Unit
View Datasheet →PIC18F27Q43-E/SS
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC18F26Q43-I/SP
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F27K42-I/SP
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →PIC18F26Q84-I/SP
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.95 / Unit
View Datasheet →PIC18F27Q43-E/SP Maximum Ratings & Electrical Characteristics
| Core | PIC18 RISC, 8-bit data path, 16-bit instruction word |
| CPU Speed (max) | 64 MHz |
| Program Memory (Flash) | 128 KB |
| Data RAM | 8 KB |
| Data EEPROM | 1024 bytes |
| ADC | 12-bit ADC with Computation (ADCC) |
| PWM | 16-bit PWM module, dual independent outputs |
| Package | 28-pin SPDIP (Skinny Plastic DIP), through-hole |
| Operating Temperature | -40C to +125C (E = Extended grade) |
| Supply Voltage | 1.8 V to 5.5 V |
| Low-Power Technology | XLP (eXtreme Low Power) |
| Core Independent Peripherals | Yes (CIPs: CWG, SMT, CCP, ZCD, etc.) |
| Functional Safety (FuSa) | Yes |
| Mounting Type | Through-Hole (THT) |
| RoHS Status | Compliant |
| MSL Level | Not applicable for through-hole package |
| Capacitive Touch Support | Yes (CVD via ADCC) |
PIC18F27Q43-E/SP Pin Configuration
| Pin 1 | MCLR — Master Clear (reset, active low) |
| Pin 2 | RA0 — I/O / analog / 5-bit DAC ref |
| Pin 3 | RA1 — I/O / analog |
| Pin 4 | RA2 — I/O / analog |
| Pin 5 | RA3 — I/O / analog (also VREF+ mode) |
| Pin 6 | RA4 — I/O / analog |
| Pin 7 | RA5 — I/O / analog |
| Pin 8 | VSS — Ground |
| Pin 9 | RA7 — I/O / oscillator |
| Pin 10 | RA6 — I/O / oscillator |
| Pin 11 | RC0 — I/O |
| Pin 12 | RC1 — I/O |
| Pin 13 | RC2 — I/O |
| Pin 14 | RC3 — I/O / SCL (I2C) |
| Pin 15 | RC4 — I/O / SDA (I2C) |
| Pin 16 | RC5 — I/O |
| Pin 17 | RC6 — I/O / TX (UART) |
| Pin 18 | RC7 — I/O / RX (UART) |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply voltage (1.8 V to 5.5 V) |
| Pin 21 | RB0 — I/O / programming |
| Pin 22 | RB1 — I/O / programming |
| Pin 23 | RB2 — I/O |
| Pin 24 | RB3 — I/O |
| Pin 25 | RB4 — I/O |
| Pin 26 | RB5 — I/O |
| Pin 27 | RB6 — I/O / programming clock |
| Pin 28 | RB7 — I/O / programming data |
Typical Applications
PIC18F27Q43-E/SP is suitable for 6 applications: Industrial Motor Control and Variable-Frequency Drives, Switched-Mode Power Supply (SMPS) Digital Control, Digital LED Lighting (DALI / DMX / 0-10V Dimmable Drivers), Capacitive Touch HMI and Appliance User Interfaces, Functional-Safety Appliances and Industrial Sensors, Battery-Powered IoT and Edge Sensor Nodes.
Industrial Motor Control and Variable-Frequency Drives
The PIC18F27Q43-E/SP is well matched to BLDC, PMSM, and stepper motor drives because its 16-bit PWM module generates dual independent complementary outputs with dead-band control, while the 12-bit ADCC samples shunt currents at 200 ksps with hardware accumulation. The Q43's 64 MHz CPU executes field-oriented-control loops with sub-microsecond jitter, and the CWG (Complementary Waveform Generator) plus ZCD (Zero-Cross Detect) eliminate external timing components. With 128 KB of Flash, designers can run sensorless-FOC and power-factor-correction firmware concurrently; XLP sleep modes reduce standby current to ~50 nA for battery-backed gate drives.
Recommended
Switched-Mode Power Supply (SMPS) Digital Control
For digital SMPS control, the PIC18F27Q43-E/SP combines a 12-bit ADCC with computation (oversampling, filtering, threshold compare) and a high-resolution 16-bit PWM that delivers fine duty-cycle steps needed for PFC and LLC topologies. The configurable logic cells let the designer route comparator and PWM events without CPU intervention, slashing loop latency to under 200 ns. CIPs such as SMT (Signal Measurement Timer) and CWG handle cycle-by-cycle current limiting and synchronous-rectifier timing. XLP technology and the 1.8V-5.5V supply range ease auxiliary-supply design across universal-input offline converters.
Recommended
Digital LED Lighting (DALI / DMX / 0-10V Dimmable Drivers)
The PIC18F27Q43-E/SP is a natural fit for digital lighting controllers because its 16-bit PWM provides flicker-free dimming below 1% duty cycle, while the 12-bit ADCC digitizes 0-10V analog dim inputs with 0.1% resolution. Four Configurable Logic Cells and a fast 64 MHz core implement DALI-2 or DMX512 stacks in firmware without external logic. The FuSa feature set and +125C extended temperature grade suit commercial luminaire housings. XLP idle current keeps wireless retrofits powered for years on a coin cell when used as a DALI bridge node.
Recommended
Capacitive Touch HMI and Appliance User Interfaces
The PIC18F27Q43-E/SP's 12-bit ADCC automates Capacitive Voltage Divider (CVD) techniques, letting it implement up to 28 self-capacitance or mutual-capacitance touch channels without an external touch IC. The hardware averaging, oversampling and threshold compare cut firmware overhead and improve EMC immunity in noisy appliance environments. Functional-safety (FuSa) diagnostics simplify IEC 60730 compliance for white goods. The 8 KB RAM comfortably stores touch libraries for slider, wheel, and matrix patterns, and XLP sleep modes keep battery-powered remotes alive for years.
Recommended
Functional-Safety Appliances and Industrial Sensors
For functional-safety designs the PIC18F27Q43-E/SP includes hardware Windowed Watchdog, dual-loop Brown-Out Reset, and CRC memory scan — easing IEC 61508 / IEC 60730 / ISO 26262 compliance. The 12-bit ADCC with hardware oversampling delivers high-integrity sensor readings for pressure, flow, and gas detectors. 128 KB Flash supports redundant firmware partitions and bootloader code for OTA safety updates. The -40C to +125C extended temperature grade is qualified for under-hood automotive and outdoor industrial installations.
Recommended
Battery-Powered IoT and Edge Sensor Nodes
The PIC18F27Q43-E/SP's XLP (eXtreme Low Power) technology delivers nanoWatt sleep currents below 50 nA with RTC retention, making it ideal for coin-cell-powered wireless sensor nodes that wake on interrupt. The 12-bit ADCC with hardware averaging oversamples low-frequency sensors at minimal CPU cost, extending battery life 2-3x vs software-driven ADCs. The 8 KB RAM holds Zigbee or LoRa protocol stacks while 128 KB Flash accommodates OTA bootloaders. Through-hole SPDIP allows hand-soldered prototypes and breadboards for low-volume IoT products.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F27Q43-E/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F27Q43-I/SP | PIC18F27Q43-E/SS | PIC18F26Q43-I/SP | PIC18F27K42-I/SP | PIC18F26Q84-I/SP |
|---|---|---|---|---|---|---|
| Package | 28-SPDIP | 28-SPDIP - same | 28-SPDIP - same | 28-SPDIP - same | 28-SPDIP - same | 28-SPDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 128 KB | 128 KB | 128 KB | 64 KB | 128 KB | 64 KB |
| CPU Speed (max) | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| PWM Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 10-bit | 16-bit |
| ADC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADC (no ADCC) | 12-bit ADCC |
| Operating Temperature | -40C to +125C (E) | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
| Functional Safety (FuSa) | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- 16-bit PWM with dual independent outputs vs older 10-bit PWM (vs PIC18F27K42-I/SP)
- 12-bit ADCC with hardware CVD vs legacy 12-bit ADC (vs PIC18F27K42-I/SP)
- Extended -40C to +125C grade availability (vs PIC18F27Q43-I/SP)
Design Notes
The PIC18F27Q43-E/SP operates from 1.8V to 5.5V. Place a 100 nF decoupling capacitor as close as possible to VDD (pin 20) with the ground return to VSS (pin 19). For battery-powered designs, use the XLP sleep modes (DOZE, PMD, IDLE) to drop current below 50 nA; refer to datasheet 40002147C section on nanoWatt XLP technology. Always use a 10 kohm pull-up on MCLR (pin 1) to ensure a clean POR.
Route the 16-bit PWM outputs (PWM1H/PWM1L, PWM2H/PWM2L) as short differential pairs, especially for motor-control outputs above 100 kHz. Keep analog inputs (RA0-RA5) away from PWM switching traces, and use a ground plane stitch between analog and digital domains. For capacitive-touch layouts, surround each touch pad with a ground hatch (hatched ground) to suppress water droplets and improve immunity to ESD.
Do not confuse /SP (SPDIP) with /SO (SOIC) or /SS (SSOP): they are the same die but different footprints. The 'E' suffix means -40C to +125C Extended grade; the 'I' suffix is -40C to +85C Industrial grade. When migrating from PIC18F27K42 code, the ADCC requires different register names than the legacy ADC, and the 16-bit PWM registers differ from the 10-bit CCP modules.
Estimated: at 64 MHz CPU speed with all peripherals active and 5.0V VDD, the part draws approximately 15 mA, yielding roughly 75 mW dissipation. The 28-SPDIP package's theta_JA is around 70 C/W, so junction-to-ambient rise is about 5 C - well within the +125C limit. For continuous high-temperature operation, derate CPU speed to 32 MHz at +125C ambient.
Compliance Information
RoHS-compliant per Microchip product page. Functional Safety (FuSa) features are integrated but the part is not AEC-Q100 qualified; choose PIC18F27Q43-E/SO for surface-mount automotive layouts if needed.
