PIC18F56Q43T-I/PT - 64KB Flash, 48-TQFP 8-bit MCU | Microchip
MPN: PIC18F56Q43T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.84 | $1,840.00 |
| 3,000 | $1.62 | $4,860.00 |
PIC18F56Q43T-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), volatile data memory (RAM), non-volatile storage (EEPROM), and a rich set of on-chip peripherals. The 8-bit PIC architecture from Microchip Technology is positioned in the taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The PIC18-Q43 family emphasizes Core Independent Peripherals (CIPs) that operate without CPU intervention, reducing firmware complexity and deterministic latency for real-time control loops.
Key features include 64KB Flash, 4KB RAM, 1KB EEPROM, up to 64MHz operation across -40C to +85C industrial temperature range, integrated 12-bit ADC with Computation (ADCC) supporting capacitive voltage divider (CVD) touch sensing, three independent 16-bit PWM channels with complementary outputs, a 6-channel DMA engine, peripheral pin select (PPS) for flexible signal routing, and 5V tolerant I/O. The TQFP-48 package supports surface-mount assembly with industry-standard 0.5mm pitch.
The PIC18F56Q43 uses an enhanced Harvard RISC architecture with a modified instruction set that allows 16-bit opcodes and a hardware multiplier. The ADCC module performs hardware-averaged oversampling and threshold comparison autonomously, while the unified PWM engine supports edge/center alignment for motor, lighting, and power-conversion control. The integrated DMA engine transfers data between peripherals and memory without CPU involvement, ideal for high-throughput sensor or communication links.
Typical applications include industrial automation and motor control, IoT edge nodes, capacitive touch user interfaces, LED lighting controllers, sensor hubs, and small home appliances. The XLP (eXtreme Low Power) feature set targets battery-powered IoT deployments.
When designing with this device, observe the decoupling network (100nF + 1uF at VDD/AVDD) and follow the Microchip MPLAB development flow with PICkit or ICD programmers. The wide operating voltage (1.8V to 5.5V) supports both 3.3V and 5V system rails with no level translation required for the digital I/O.
This page synthesizes distributor pricing, same-package PIC18 drop-in alternatives, and practical design notes that complement the manufacturer datasheet.
Drop-in alternatives for PIC18F56Q43T-I/PT — 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 PIC18F56Q43T-I/PT (same form factor and footprint) — differing in ADC, I/O Pins, Package, Program Memory (Flash), Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F56Q43-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F57Q43T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F46Q43T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F56Q43T-E/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F56Q43T-I/PTVAO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F55K42-I/PT
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC18F56Q43T-I/PT Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC18 (enhanced Harvard RISC) |
| Program Memory (Flash) | 64 KB |
| Data Memory (RAM) | 4 KB |
| Data EEPROM | 1 KB |
| Maximum CPU Frequency | 64 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| ADC | 12-bit ADCC (with Computation) |
| DAC | 8-bit |
| PWM Channels | 3 x 16-bit |
| DMA Channels | 6 |
| Comparators | Yes (Core Independent) |
| Package | 48-pin TQFP (PT) 7x7 mm |
| I/O Pins | 44 (approximate, with PPS) |
| Mounting Type | Surface Mount |
| MSL Level | MSL3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
PIC18F56Q43T-I/PT Pin Configuration
| Pin 1 | RE3/MCLR — Master Clear (reset) input or digital I/O |
| Pin 2 | RA0 — Port A bit 0 / analog / digital GPIO |
| Pin 3 | RA1 — Port A bit 1 / analog / digital GPIO |
| Pin 4 | RA2 — Port A bit 2 / analog / digital GPIO |
| Pin 5 | RA3 — Port A bit 3 / analog / digital GPIO |
| Pin 6 | RA4 — Port A bit 4 / analog / digital GPIO |
| Pin 7 | RA5 — Port A bit 5 / analog / digital GPIO |
| Pin 8 | RE0 — Port E bit 0 / GPIO |
| Pin 9 | RE1 — Port E bit 1 / GPIO |
| Pin 10 | RE2 — Port E bit 2 / GPIO |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/RA7 — Crystal/clock input or GPIO |
| Pin 14 | OSC2/RA6 — Crystal/clock output or GPIO |
| Pin 15 | RC0 — Port C bit 0 / analog / digital GPIO |
| Pin 16 | RC1 — Port C bit 1 / analog / digital GPIO |
| Pin 17 | RC2 — Port C bit 2 / analog / digital GPIO |
| Pin 18 | RC3 — Port C bit 3 / analog / digital GPIO |
| Pin 19 | RD0 — Port D bit 0 / GPIO |
| Pin 20 | RD1 — Port D bit 1 / GPIO |
| Pin 21 | RD2 — Port D bit 2 / GPIO |
| Pin 22 | RD3 — Port D bit 3 / GPIO |
| Pin 23 | RC4 — Port C bit 4 / analog / digital GPIO |
| Pin 24 | RC5 — Port C bit 5 / analog / digital GPIO |
| Pin 25 | RC6 — Port C bit 6 / analog / digital GPIO |
| Pin 26 | RC7 — Port C bit 7 / analog / digital GPIO |
| Pin 27 | RD4 — Port D bit 4 / GPIO |
| Pin 28 | RD5 — Port D bit 5 / GPIO |
| Pin 29 | RD6 — Port D bit 6 / GPIO |
| Pin 30 | RD7 — Port D bit 7 / GPIO |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage |
| Pin 33 | RB0 — Port B bit 0 / analog / digital GPIO |
| Pin 34 | RB1 — Port B bit 1 / analog / digital GPIO |
| Pin 35 | RB2 — Port B bit 2 / analog / digital GPIO |
| Pin 36 | RB3 — Port B bit 3 / analog / digital GPIO |
| Pin 37 | RB4 — Port B bit 4 / analog / digital GPIO |
| Pin 38 | RB5 — Port B bit 5 / analog / digital GPIO |
| Pin 39 | RB6 — Port B bit 6 / ICSPCLK / GPIO |
| Pin 40 | RB7 — Port B bit 7 / ICSPDAT / GPIO |
| Pin 41 | AVDD — Analog positive supply |
| Pin 42 | AVSS — Analog ground |
| Pin 43 | RA0/AN0 — Note: shared with pin 2; refer to datasheet for specific analog assignments |
| Pin 44 | RE0 — Note: shared assignments possible; refer to datasheet |
| Pin 45 | RE1 — Port E bit 1 / GPIO |
| Pin 46 | RE2 — Port E bit 2 / GPIO |
| Pin 47 | VSS — Ground reference |
| Pin 48 | VDD — Positive supply voltage |
Typical Applications
PIC18F56Q43T-I/PT is suitable for 6 applications: BLDC / PMSM Motor Control, IoT Edge / Battery-Operated Sensor Hub, Capacitive Touch User Interface, LED Lighting and Drivers, Industrial Sensor Hub / Data Acquisition, Functional Safety / Home Appliance Control.
BLDC / PMSM Motor Control
The PIC18F56Q43T-I/PT fits BLDC and PMSM motor control because its three independent 16-bit PWM channels deliver complementary outputs with programmable dead-band, and the 12-bit ADCC samples phase currents and BEMF simultaneously. The 64MHz CPU at 16 MIPS executes field-oriented control (FOC) at 8 to 16 kHz PWM frequencies, leaving headroom for speed/torque loops. Used with an MCP8024 gate driver and shunt current sensing on a 3-phase BLDC drive, the part reduces external component count versus an MCU plus external PWM controller solution.
Recommended
IoT Edge / Battery-Operated Sensor Hub
The PIC18F56Q43T-I/PT fits battery-powered IoT edge sensors thanks to its XLP (eXtreme Low Power) mode with sub-uA sleep current and the integrated 12-bit ADCC performing hardware-averaged oversampling to reduce wake-ups. Operating from 1.8V to 5.5V, it can connect directly to a single Li-ion cell or two AA cells without a boost regulator. Core Independent Peripherals (CIPs) like the DMA engine and CWG handle UART bit-banging or sensor polling while the CPU sleeps, extending battery life in remote sensor deployments.
Recommended
Capacitive Touch User Interface
The PIC18F56Q43T-I/PT is well matched to capacitive touch panels because the 12-bit ADCC with CVD (Capacitive Voltage Divider) automates capacitive touch sensing with hardware oversampling and threshold comparison. Up to 16 touch channels can be scanned with the mTouch library, and the DMA engine keeps the CPU free during scans. The 64KB Flash allows rich gesture and proximity recognition firmware that would otherwise need an external touch controller.
Recommended
LED Lighting and Drivers
The PIC18F56Q43T-I/PT works in digital LED drivers and tunable-white lighting, where its 16-bit PWM resolution enables >20-bit color-mixing smoothness and the 8-bit DAC delivers analog dimming curves. The 12-bit ADCC enables feedback from ambient-light sensors and LED current shunts for closed-loop brightness control. Six DMA channels drive WS2812-style addressable LED strips while the CPU executes lighting-effects engine, simplifying firmware versus bit-banged GPIO implementations.
Recommended
Industrial Sensor Hub / Data Acquisition
The PIC18F56Q43T-I/PT serves as a cost-optimized industrial sensor hub because its 12-bit ADCC scans multiple analog inputs with hardware averaging, the 6-channel DMA offloads buffer transfers, and Core Independent Peripherals handle UART, SPI, and I2C streams without CPU intervention. The 1.8V to 5.5V supply allows direct interface to 3.3V and 5V industrial sensors. The 64KB Flash supports IEC 61131-3 function-block protocol stacks or Modbus server firmware.
Recommended
Functional Safety / Home Appliance Control
The PIC18F56Q43 family is designated by Microchip as a Functional Safety (FuSa) component family, providing self-test and lockout features useful for IEC 60730 Class B home appliances such as washing machines, induction cooktops, and motor-driven dishwashers. The PIC18F56Q43T-I/PT supports UART/SPI bootloader and IEC 60730 self-test routines stored in 64KB Flash. The wide operating range and rigorous industrial screening target safety-critical household deployments where a separate supervisory IC is not needed.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F56Q43T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F56Q43-I/PT | PIC18F57Q43T-I/PT | PIC18F46Q43T-I/PT | PIC18F56Q43T-E/PT | PIC18F55K42-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-pin TQFP (PT) 7x7 mm | 48-pin TQFP (PT) - same | 48-pin TQFP (PT) - same | 48-pin TQFP (PT) - same | 48-pin TQFP (PT) - same | 48-pin TQFP (PT) - same |
| Flash Program Memory | 64 KB | 64 KB | 128 KB | 64 KB (F46 variant) | 64 KB | 32 KB |
| RAM | 4 KB | 4 KB | 8 KB | 4 KB | 4 KB | 2 KB |
| Maximum CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Operating Temperature Range | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) |
| ADC Resolution | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADC (no ADCC engine) |
| PWM Channels | 3 x 16-bit | 3 x 16-bit | 3 x 16-bit | 3 x 16-bit | 3 x 16-bit | 2 x 16-bit |
| DMA Channels | 6 | 6 | 6 | 6 | 6 | 0 (no DMA) |
Key Differentiators
- Integrated 6-channel DMA engine for CPU-independent data movement (vs PIC18F55K42-I/PT)
- 12-bit ADC with Computation engine (ADCC) for hardware-averaged oversampling (vs PIC18F55K42-I/PT)
- Functional Safety (FuSa) family designation with IEC 60730 Class B support (vs PIC18F55K42-I/PT)
Design Notes
Decouple VDD and AVDD close to their respective pins with a 100nF ceramic capacitor per pin, plus a bulk 1uF to 10uF capacitor at the supply input. The PIC18F56Q43T-I/PT allows AVDD to equal VDD (1.8V to 5.5V) or to be driven separately for noise-sensitive analog measurements; verify the datasheet's absolute maximum AVDD-VSS = 6.0V before connecting directly to a 5V analog supply in electrically noisy motor-drive circuits.
Route the ICSPDAT and ICSPCLK lines (RB7/RB6) as a dedicated pair for in-circuit serial programming. Place the 4-pin ICSP header near the MCU with a 4.7k pull-up on MCLR/RE3 and reserve space for a programming clip footprint to allow field firmware updates. Refer to Microchip AN243 and the MPLAB development tool documentation for the recommended header pinout.
Keep high-current PWM traces short and route return currents above/below them to minimize loop inductance; place snubber RC networks close to the PWM output pins (typically 1 ohm + 1 nF in series with the gate drive). Isolate the AGND/AVSS island under the analog ADC inputs and join it to the main ground at a single point near the MCU's VSS pin to avoid ground-loop noise coupling into the 12-bit ADC.
Do not leave the MCLR/RE3 pin floating; the part includes an internal weak pull-up but external noise can still cause spurious resets in electrically noisy environments (motor drives, switching regulators). Add an external 10k pull-up to VDD, optionally with a 100nF cap to slow reset transitions. Also, ensure unused digital I/O are configured as outputs (drive low or high) rather than inputs, otherwise floating CMOS inputs can oscillate and draw several mA per pin.
When using the 12-bit ADCC with a sample rate above 100 ksps, avoid placing digital traces directly above or beside the analog signal traces; keep a 2x trace-width gap or polygon separation. Estimated: at 500 ksps aggregate input switching, a digital trace routed within 10 mm of an analog trace couples roughly 5 to 15 mV of switching noise into the ADC input, exceeding 1 LSB of the 12-bit range on a 5V full-scale signal.
Compliance Information
RoHS compliant per Microchip product page. Industrial -40C to +85C temperature grade; Extended -40C to +125C variants available (PIC18F56Q43T-E/PT). VAO suffix denotes automotive-validated option. Functional Safety family designation per Microchip.
