PIC18F43K20-I/MV - 8KB Flash 64MHz 8-bit MCU | Microchip
MPN: PIC18F43K20-I/MV ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.46 | $34.60 |
| 100 | $2.78 | $278.00 |
| 500 | $2.35 | $1,175.00 |
| 1,000 | $1.97 | $1,970.00 |
PIC18F43K20-I/MV Overview
What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of 8/16/32-bit RISC microcontrollers from Microchip built around a Harvard architecture. The PIC18F family sits in the mid-range tier, balancing code density, peripheral integration and ultra-low-power operation. Microcontrollers in this class combine a CPU core, Flash program memory, RAM, EEPROM, timers, communication peripherals (UART/SPI/I2C) and analog blocks on a single die, forming the smallest possible self-contained computer for embedded control. The PIC18F43K20 belongs to the PIC18F K20 sub-family, distinguished by nanoWatt XLP energy-management modes and 10-bit ADC capability.
Key features include 36 I/O pins with peripheral pin select, four 16-bit timers, one 8-bit timer, two comparators with programmable voltage reference, two CCP modules, an enhanced USART, MSSP for SPI and I2C, a 13-channel 10-bit ADC and an on-chip 1.2 V fixed voltage reference. The 40-pin UQFN package exposes a thermal pad for low thermal resistance, allowing operation at the full -40 C to +85 C industrial temperature range.
Typical applications are portable battery-powered instruments, sensor-interface boards, low-power wireless sensor nodes, USB/serial human-interface devices, and general-purpose embedded control where code density, low sleep current and small PCB footprint are all required.
When designing with this part, ensure the exposed pad is soldered to a sufficiently large copper pour for thermal relief and ground integrity; bypassing VDD with a 100 nF ceramic capacitor placed within 5 mm of the supply pin is recommended for clean ADC and PLL operation.
This page synthesizes current distributor pricing, Microchip PIC18F K20 family cross-references and practical PCB design notes that complement the manufacturer datasheet.
Drop-in alternatives for PIC18F43K20-I/MV — 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 PIC18F43K20-I/MV (same form factor and footprint) — differing in ADC, Package, Timers, Operating Temperature Range, Operating Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F43K20T-I/MV
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View Datasheet →PIC18F45K20-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F46K20-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F43K22-I/MV
✅ Drop-In✓ In Stock
$1.08 / Unit
View Datasheet →PIC18F26K40-I/MV
✅ Drop-In✓ In Stock
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View Datasheet →PIC18F43K20-I/MV Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC RISC 8-bit |
| Series | PIC18F K20 / PIC18F43K20 |
| Program Memory (Flash) | 8 KB (4K x 16) |
| SRAM | 768 bytes |
| EEPROM | 256 bytes |
| Max CPU Speed | 64 MHz (16 MIPS, 4 clocks/instruction cycle) |
| Supply Voltage (VDD) | 1.8 V to 3.6 V |
| Operating Temperature (I grade) | -40 C to +85 C |
| Package | 40-pin UQFN (5x5 mm) with exposed pad (MV) |
| I/O Pins | 36 |
| ADC | 10-bit, up to 13 channels |
| Comparators | 2 rail-to-rail analog comparators |
| Fixed Voltage Reference (FVR) | 1.2 V nominal |
| Timers | 4 x 16-bit, 1 x 8-bit |
| Communication Peripherals | 1x EUSART, 1x MSSP (SPI/I2C) |
| I/O Sink/Source | 25 mA / 25 mA |
| Low-Power Technology | nanoWatt XLP |
| CCP Modules | 2 |
| RoHS | Compliant |
| MSL Level | 3 (168 hours) |
PIC18F43K20-I/MV 40-pin uqfn (5x5 mm) with exposed pad (mv) Pin Configuration Guide
Pin configuration for PIC18F43K20-I/MV (40-pin uqfn (5x5 mm) with exposed pad (mv) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC18F43K20-I/MV.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18F43K20-I/MV is suitable for 6 applications: Battery-Powered Sensor Node, USB / Serial Human-Interface Device, Industrial Control / Sensor Interface Board, Portable Medical Monitoring Device, Home Appliance User Interface, Automotive Accessory and Lighting Module.
Battery-Powered Sensor Node
The PIC18F43K20-I/MV is well matched to battery-powered sensor nodes because its nanoWatt XLP technology enables sleep currents below 1 uA, while 8 KB Flash fits typical ZigBee or LoRa stack-in-application code. Operating from 1.8 V to 3.6 V lets the part run directly from a single lithium coin cell or two alkaline AAs. The 13-channel 10-bit ADC handles multiple analog sensors with no external multiplexer, and the integrated 1.2 V FVR improves absolute ADC accuracy. Designers typically use the MSSP to drive an SPI temperature sensor and the EUSART to push data through a low-power transceiver, with Sleep and Idle modes managed by interrupt-on-change on digital GPIO pins.
Recommended
USB / Serial Human-Interface Device
The PIC18F43K20-I/MV can serve as the main MCU in HID peripherals such as custom keyboards, mice, barcode scanners and small instrumentation keypads. The 64 MHz internal oscillator provides reliable USB-FS timing at 48 MHz via software PLL, while the EUSART and MSSP handle USB-to-UART or USB-to-SPI bridging. The 36 I/O pins easily accommodate 8x8 key matrices, indicator LEDs and rotary encoders. At 3.3 V, the 25 mA sink/source capability drives LEDs directly without drivers. The UQFN-40 (MV) package keeps PCB size around 25 mm x 25 mm, ideal for compact plastic enclosures.
Recommended
Industrial Control / Sensor Interface Board
In industrial control panels the PIC18F43K20-I/MV aggregates analog and digital inputs, runs Modbus-RTU on the EUSART, and updates local status indicators. The 10-bit ADC with 13 channels accepts 4-20 mA transducer signals through external shunt resistors, while two rail-to-rail analog comparators provide fast over-current or over-voltage detection. The -40 C to +85 C industrial temperature rating suits cabinet-mounted installations. The UQFN exposed pad and wide operating range allow long-term deployment without active cooling. The 8 KB Flash is adequate for PID-style control loops with HMI menu support.
Recommended
Portable Medical Monitoring Device
The PIC18F43K20-I/MV fits portable medical accessories such as handheld pulse oximeters, single-parameter patient monitors and drug-delivery pumps where low power and a small PCB are essential. nanoWatt XLP sleep below 100 nA in RTCC mode extends battery life between measurements, while the 13-channel 10-bit ADC reads photodiode, thermistor and pressure-sensor signals. The 1.2 V FVR and ratiometric ADC measurements support accurate SpO2 and NIBP conversions. With 8 KB Flash, the firmware can include averaging filters, alarm thresholds and small LCD menu handling without external memory.
Recommended
Home Appliance User Interface
For white-goods user-interface boards the PIC18F43K20-I/MV drives segmented LCD or LED indicators, scans capacitive or matrix keypads and exchanges commands with the main appliance controller over UART. Its 36 I/O lines fit 7-segment digit displays plus indicator LEDs without external drivers, and the EUSART handles main-MCU commands at 115200 baud. nanoWatt XLP idle modes let the front panel keep a clock running on standby at sub-mA current, and the 40-pin UQFN fits behind narrow bezels of ovens, washing machines and dishwashers.
Recommended
Automotive Accessory and Lighting Module
In interior lighting, dashboard accessories and aftermarket automotive modules the PIC18F43K20-I/MV controls LED strings, reads switch positions and reports diagnostics. The 64 MHz clock and CCP/PWM modules generate flicker-free LED dimming at 1 kHz to 20 kHz PWM, while the EUSART drives CAN or LIN transceivers for body-network communication. Two rail-to-rail comparators implement battery-voltage monitoring and reverse-polarity protection. Designers targeting -40 C to +125 C should select the E (extended) grade variant instead, but the I (industrial) grade is widely used for cabin-mounted accessories.
