PIC18F45Q43T-I/MP - 8-bit MCU, 32KB Flash, 64MHz | Microchip
MPN: PIC18F45Q43T-I/MP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.1 | $3.10 |
| 10 | $2.79 | $27.90 |
| 100 | $2.18 | $218.00 |
| 500 | $1.84 | $920.00 |
| 1,000 | $1.59 | $1,590.00 |
PIC18F45Q43T-I/MP Overview
An 8-bit microcontroller (MCU) is a programmable microprocessor-on-a-chip optimized for embedded control. It integrates a CPU, non-volatile program memory (Flash), volatile data memory (SRAM), EEPROM for parameter storage, and a rich set of peripherals such as timers, ADC, PWM, communication interfaces (UART, SPI, I2C), and increasingly, on-chip analog and logic peripherals. PIC18 devices sit in the hierarchy 8-bit MCU -> PIC18 family -> enhanced mid-range core -> low-power XLP technology platform. They are widely used for deterministic real-time control in industrial, automotive, consumer, and IoT products.
Key features of the PIC18F45Q43 include three 16-bit dual-output PWMs (six PWM channels), a 12-bit ADC with computation (ADCC), an 8-bit DAC, comparators, six channels of DMA, vectored interrupts with fixed three-cycle latency, and high/low priority selection. The device operates from 1.8 V to 5.5 V, supports eXtreme Low Power (XLP) sleep currents in the nanoamp range, and integrates a 32 kHz internal oscillator plus a 64 MHz HFINTOSC for flexible clocking.
Architecturally, the Q43 family is built around Core Independent Peripherals that can be chained through the Peripheral Pin Select (PPS) and event system to perform sensor reading, signal generation, and protection functions without waking the CPU. The result is reduced firmware complexity, deterministic interrupt response, and lower average power consumption. Memory-mapped configuration registers allow fine-grained tuning of analog, timing, and interconnect behavior.
Typical applications include industrial sensor nodes, low-power IoT edge devices, motor and lighting control, USB-CDC human-interface devices, and consumer appliances requiring small footprint and tight code/data integration. The 40-pin QFN package suits space-constrained PCBs while exposing 36 I/O lines.
For design success, place a 0.1 uF decoupling capacitor adjacent to each VDD pin and a bulk capacitor near the AVdd rail. Always configure unused pins as outputs low and use the PPS system to remap peripherals instead of hard-wiring signals. Verify in-circuit programming via ICSP requires dedicated PGC/PGD pins and proper MCLR pull-up design.
This page aggregates distributor pricing, drop-in Q43 and Q10 alternatives, application guidance, and design notes not collected in any single manufacturer document.
Drop-in alternatives for PIC18F45Q43T-I/MP — 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 PIC18F45Q43T-I/MP (same form factor and footprint) — differing in ADC, DAC, Package, Program Memory (Flash), MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F45Q43-I/MP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F45Q43-I/P
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →PIC18F46Q43T-I/MP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F45Q10T-I/MP
✅ Drop-In✓ In Stock
$1.88 / Unit
View Datasheet →PIC18F45K42T-I/ML
✅ Drop-In✓ In Stock
$1.75 / Unit
View Datasheet →PIC18F45Q10-I/MP
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC18F45Q43T-I/MP Maximum Ratings & Electrical Characteristics
| Core | PIC18 enhanced mid-range 8-bit |
| Maximum CPU Clock Frequency | 64 MHz |
| Instruction Throughput | 16 MIPS |
| Program Memory (Flash) | 32 KB |
| Data SRAM | 2 KB |
| Data EEPROM | 1 KB |
| Operating Voltage Range | 1.8 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 12-bit ADCC |
| DAC | 8-bit |
| PWM Channels | 6 (3x 16-bit dual-output) |
| DMA Channels | 6 |
| Comparators | Yes |
| Package | 40-pin QFN (MP) 5x5 mm |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
PIC18F45Q43T-I/MP Pin Configuration
| Pin 1 | ICSPDAT/RA0 — ICSP data / Port A bit 0 |
| Pin 2 | ICSPCLK/RA1 — ICSP clock / Port A bit 1 |
| Pin 3 | MCLR/RA3 — Reset input (active low) / Port A bit 3 |
| Pin 4 | RA4 — Port A bit 4 |
| Pin 5 | RA5 — Port A bit 5 |
| Pin 6 | RA6 — Port A bit 6 |
| Pin 7 | RA7 — Port A bit 7 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | VDD — Positive supply voltage |
| Pin 10 | RB0 — Port B bit 0 (PPS-remappable) |
| Pin 11 | RB1 — Port B bit 1 (PPS-remappable) |
| Pin 12 | RB2 — Port B bit 2 (PPS-remappable) |
| Pin 13 | RB3 — Port B bit 3 (PPS-remappable) |
| Pin 14 | RB4 — Port B bit 4 (PPS-remappable) |
| Pin 15 | RB5 — Port B bit 5 (PPS-remappable) |
| Pin 16 | RB6 — Port B bit 6 (PPS-remappable, ICSPCLK) |
| Pin 17 | RB7 — Port B bit 7 (PPS-remappable, ICSPDAT) |
| Pin 18 | VSS — Ground reference |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RC0 — Port C bit 0 (PPS-remappable) |
| Pin 21 | RC1 — Port C bit 1 (PPS-remappable) |
| Pin 22 | RC2 — Port C bit 2 (PPS-remappable) |
| Pin 23 | RC3 — Port C bit 3 (PPS-remappable) |
| Pin 24 | RC4 — Port C bit 4 (PPS-remappable) |
| Pin 25 | RC5 — Port C bit 5 (PPS-remappable) |
| Pin 26 | RC6 — Port C bit 6 (PPS-remappable, TX) |
| Pin 27 | RC7 — Port C bit 7 (PPS-remappable, RX) |
| Pin 28 | RD0 — Port D bit 0 (PPS-remappable) |
| Pin 29 | RD1 — Port D bit 1 (PPS-remappable) |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RD2 — Port D bit 2 (PPS-remappable) |
| Pin 33 | RD3 — Port D bit 3 (PPS-remappable) |
| Pin 34 | RD4 — Port D bit 4 (PPS-remappable) |
| Pin 35 | RD5 — Port D bit 5 (PPS-remappable) |
| Pin 36 | RD6 — Port D bit 6 (PPS-remappable) |
| Pin 37 | RD7 — Port D bit 7 (PPS-remappable) |
| Pin 38 | VSS — Ground reference |
| Pin 39 | VDD — Positive supply voltage |
| Pin 40 | RE3 — Port E bit 3 |
| Pin EP | EP — Exposed thermal pad - connect to ground |
Typical Applications
PIC18F45Q43T-I/MP is suitable for 7 applications: Industrial Sensor Node with Battery Power, Low-Power IoT Edge Device with Wireless Link, BLDC Motor and Lighting Control, USB-CDC Human Interface Device (HID), Consumer Appliance Control Board, Automotive Body and Lighting Module, Medical Monitoring Wearable.
Industrial Sensor Node with Battery Power
The PIC18F45Q43T-I/MP suits battery-powered industrial sensor nodes because of its 32 KB Flash and 1.8-5.5 V wide-supply operation, which covers both coin-cell and 3.6 V LiSOCl2 chemistries. Its eXtreme Low Power (XLP) sleep currents in the nanoamp range and event-driven Core Independent Peripherals let the device wake on a sensor threshold without CPU intervention, extending battery life to multi-year deployments. Six DMA channels move data between peripherals and memory without waking the core, and the 12-bit ADCC with oversampling enables high-precision temperature, pressure, or flow measurements from bridge sensors while keeping the CPU in Idle.
Recommended
Low-Power IoT Edge Device with Wireless Link
The PIC18F45Q43T-I/MP pairs with sub-GHz or BLE modules as an edge controller that aggregates sensor data, runs lightweight filtering, and forwards packets via UART/SPI. Its 64 MHz core (16 MIPS) handles protocol stack offload while six PWM channels drive actuators; the 2 KB SRAM buffer accommodates bursty radio traffic, and 1 KB EEPROM stores configuration persistently across power cycles. The PPS system allows flexible SPI/I2C/UART pin mapping to the wireless module without remapping firmware, easing PCB layout.
Recommended
BLDC Motor and Lighting Control
The three 16-bit dual-output PWMs (six channels total) on the PIC18F45Q43T-I/MP generate complementary drive signals for three-phase BLDC or brushless DC fan motor commutation. Combined with the on-chip comparators and 12-bit ADCC, the MCU implements sensorless back-EMF zero-cross detection and overcurrent protection in hardware, reducing firmware load. The 64 MHz core executes field-oriented control loops at 16 MIPS while PPS remaps PWM outputs to any GPIO, simplifying PCB layout for high-current half-bridges.
Recommended
USB-CDC Human Interface Device (HID)
The PIC18F45Q43T-I/MP can implement USB-CDC virtual COM port devices using an external USB transceiver and on-chip UART, supporting 12 Mbps full-speed USB through PPS. The 32 KB Flash is sufficient for CDC class driver plus application logic, and the 2 KB SRAM buffers CDC packets without flow-control stalls. Designers benefit from Microchip's free USB framework for PIC18, validated against the device's interrupt priorities and PPS configuration.
Recommended
Consumer Appliance Control Board
The PIC18F45Q43T-I/MP integrates the peripherals needed for white-goods control boards: PWMs for triac/SCR firing, ADC for temperature and line-voltage sensing, comparators for zero-cross detection, and EEPROM for last-state memory. Its 1.8-5.5 V supply works directly from rectified mains via a small LDO, and XLP nanoamp sleep modes enable standby power below 0.1 W to meet Energy Star and EU ecodesign regulations for household appliances.
Recommended
Automotive Body and Lighting Module
Although PIC18F45Q43T-I/MP is rated -40C to +85C industrial grade, the same die family extends to AEC-Q100 qualified automotive variants (PIC18F46Q43-E/MP etc.), and design practices transfer directly. The 12-bit ADCC reads LIN/CAN bus levels, while six DMA channels offload bus traffic to RAM without CPU wake, ideal for body controllers managing interior lighting and door modules. The 40-pin QFN footprint survives automotive vibration when properly board-mounted with underbody epoxy.
Recommended
Medical Monitoring Wearable
The PIC18F45Q43T-I/MP suits low-power medical wearables like pulse oximeters and continuous glucose monitor dongles because its XLP sleep currents in the nanoamp range enable weeks-long battery life. The 12-bit ADCC samples photodiode or bio-impedance signals at low duty cycle, and the 8-bit DAC drives bias currents for sensor front-ends. With 1 KB EEPROM storing calibration data, the device retains accuracy across device lifetimes, important for medical-grade measurements.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F45Q43T-I/MP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F45Q43-I/MP | PIC18F46Q43T-I/MP | PIC18F45Q10T-I/MP | PIC18F45K42T-I/ML |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-QFN (MP) 5x5 mm | 40-QFN (MP) 5x5 mm | 40-QFN (MP) 5x5 mm | 40-QFN (MP) 5x5 mm | 40-QFN (ML) 5x5 mm |
| Flash Memory | 32 KB | 32 KB | 64 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 4 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| DMA Channels | 6 | 6 | 6 | 0 (no DMA) | 0 (no DMA) |
| Operating Voltage | 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 | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Six DMA channels for peripheral-to-memory offload (vs PIC18F45Q10T-I/MP)
- Event system enabling peripheral-to-peripheral signalling (vs PIC18F45K42T-I/ML)
- 12-bit ADCC with hardware oversampling and averaging (vs PIC18F45Q10T-I/MP)
- Vectored interrupts with fixed 3-cycle latency (vs PIC18F45Q43-I/P)
Design Notes
Decoupling: place a 0.1 uF X7R ceramic capacitor within 3 mm of every VDD pin and a single 1-10 uF bulk capacitor adjacent to the VDD/AVDD pair. The Q43 internal regulator responds to fast current transients when Core Independent Peripherals switch state; insufficient bulk capacitance causes brown-out resets under PWM or DMA load. For battery applications, add a 100 nF cap on the MCLR line to prevent spurious resets from voltage dips during sleep-wake transitions.
Layout: The 40-QFN exposed thermal pad (EP) must be soldered to a continuous ground copper pour, with thermal vias to inner ground planes for heat dissipation. Keep the ICSP clock/data traces short and away from PWM outputs and high-current switching nodes to avoid programming glitches. PPS routing requires that peripheral signals share the same I/O bank to avoid skew; group UART/SPI lines on adjacent pins to minimize latency.
Common pitfalls: (1) Configuring unused pins as analog inputs without disabling them causes additional current draw; always set unused pins to digital outputs low. (2) PPS lock on the PPSLOCK register must follow Microchip's unlock sequence or PPS writes silently fail. (3) The 12-bit ADCC requires its own voltage regulator settling time after wake-from-sleep; allow at least 5 us before triggering conversions. (4) EEPROM writes are not blocked by interrupts - guard writes with atomic sequences if the application uses ISRs that read the same locations.
Clock routing: If using an external crystal, place the load capacitors within 5 mm of the OSC1/OSC2 pins, keep traces short and symmetric, and guard them with a ground ring. The internal 64 MHz HFINTOSC is factory-trimmed to +/-2% and is recommended for low-EMI applications, eliminating the external crystal layout entirely. When switching from HFINTOSC to crystal, allow 1 ms startup before re-enabling peripherals to avoid frequency drift during boot.
Compliance Information
RoHS and REACH compliant per Microchip product page. Standard industrial grade -40C to +85C; for AEC-Q100 automotive grade use PIC18F46Q43-E/MP or equivalent -E suffix parts.
