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PIC18F4221-I/ML - 40MHz 8-bit MCU 4KB Flash 44-QFN | Microchip
PIC18F4221-I/ML

PIC18F4221-I/ML - 40MHz 8-bit MCU 4KB Flash 44-QFN | Microchip

The Microchip Technology PIC18F4221-I/ML is an 8-bit PIC18F-family microcontroller running up to 40 MHz with 4 KB (2K x 16) of enhanced Flash program memory, 512 bytes of SRAM, and 256 bytes of EEPROM, housed in a 44-pin QFN (8x8 mm) package with exposed thermal pad. The /ML suffix indicates the industrial temperature range (-40C to +85C) and the 44-QFN package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O on a single die. The PIC18F family sits in Microchip's 8-bit enhanced architecture tier, offering C compiler-friendly instruction set, hardware multiplier, linear program memory up to 2 MB, and the nanoWatt Technology power-management suite for low-power designs. Key features include thirteen 10-bit ADC channels, two analog comparators, two capture/compare/PWM modules, an MSSP configurable as SPI or I2C, an EUSART, 36 digital I/O lines, and self-programming support for in-application firmware upgrades. nanoWatt Technology provides multiple idle and sleep modes (Run, Idle, Sleep, RC_RUN, RC_IDLE) with fast wake-up, making the device suitable for battery-powered embedded products. The enhanced Harvard architecture delivers up to 10 MIPS at 40 MHz while maintaining deterministic interrupt latency. Internal oscillator options and wide operating voltage (4.2V-5.5V) eliminate external clock hardware in cost-sensitive designs, and the 10-bit ADC at up to 30 ksps supports sensor-conditioning and closed-loop control tasks. Typical applications include industrial sensor interfaces, appliance control panels, HVAC fan controllers, low-end consumer devices, USB-less embedded controls, and automotive body modules (under-the-hood parts require AEC-Q100 grade). The 36 I/O count and 10-bit ADC make it a balanced general-purpose MCU. When designing with this part, ensure 5V supply regulation within 4.2V-5.5V and provide adequate decoupling. The QFN-44 exposed pad must be soldered to the ground plane for thermal dissipation; failure to do so derates thermal performance significantly. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC18F4221-I/P - 8-bit 40MHz 4KB Flash MCU | Microchip DIP-40
PIC18F4221-I/P

PIC18F4221-I/P - 8-bit 40MHz 4KB Flash MCU | Microchip DIP-40

The Microchip Technology PIC18F4221-I/P is an 8-bit PIC18 family flash microcontroller with 40 MHz maximum clock speed, 4 KB (2K x 16) of program flash memory, 512 bytes of SRAM, and 256 bytes of EEPROM, housed in a 40-pin PDIP (DIP-40) through-hole package. According to the manufacturer datasheet, the device operates from 4.2 V to 5.5 V, delivers up to 16 MIPS throughput, and integrates 36 digital I/O pins, a 13-channel 10-bit ADC, two analog comparators, one 8-bit and one 16-bit timer, plus a master SSP configurable as SPI (3-wire) or I2C (2-wire). An 8-bit microcontroller (MCU) is a single-chip computer that uses an 8-bit data path and Harvard or modified-Harvard architecture optimized for deterministic, low-latency control of sensors, switches, and actuators. PIC microcontrollers belong to the broader category of microcontrollers (MCU) -> 8-bit MCU -> RISC MCU -> embedded controller -> semiconductor IC. They compete with AVR, 8051, and STM8 families and are widely used in cost-sensitive, low-power industrial and consumer designs where ease of programming (C compiler-friendly) and long product lifecycles matter most. The PIC18F4221-I/P features nanoWatt technology for power-managed sleep modes, an ICD (In-Circuit Debugger) interface, self-programmability for field firmware updates, and 256-byte data EEPROM for non-volatile parameter storage. Its enhanced flash memory supports read-while-write operation, and the C compiler-optimized instruction set (200 ns instruction cycle at 40 MHz) makes code generation straightforward for designers migrating from PIC16 or PIC17 platforms. The architecture combines a RISC CPU core with peripheral modules including two CCP (Capture/Compare/PWM) channels, a USART with addressable asynchronous mode, and an enhanced addressable synchronous serial port. Internal oscillator options and the nanoWatt power management block (Idle, Sleep, and Run modes with on-the-fly clock switching) enable battery-friendly operation in remote sensor nodes, while the 13-channel 10-bit ADC supports direct interface to analog front-ends. Typical applications include industrial control panels, sensor signal conditioning, low-end motor control (DC brushed and small steppers via CCP/PWM), home appliances, automotive body electronics (non-safety), HVAC thermostats, and consumer white goods. The wide 4.2-5.5V supply range and 40-pin PDIP package make the part especially popular in hobbyist, education, and legacy industrial platforms where through-hole soldering and breadboard prototyping remain standard. When designing with this part, reserve the MCLR/VPP pin for in-circuit serial programming (ICSP) and ensure decoupling capacitance of 0.1 uF plus 10 uF bulk is placed within 5 mm of VDD. For low-power designs, use the nanoWatt sleep modes and configure the ADC clock prescaler to avoid continuous conversion wake-ups. The 40-pin PDIP package simplifies prototyping but limits board density - migrate to the 44-pin TQFP (PIC18F4421-I/PT) or 44-pin QFN variants when production volume requires SMD assembly. This page synthesizes distributor pricing (DigiKey, Mouser, LCSC), pin-compatible drop-in alternatives from the same PIC18F family, and practical design notes not collected in any single manufacturer datasheet.

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PIC18F4221T-I/ML - 8-bit PIC MCU 4KB Flash 40MHz 44-QFN | Microchip
PIC18F4221T-I/ML

PIC18F4221T-I/ML - 8-bit PIC MCU 4KB Flash 40MHz 44-QFN | Microchip

The Microchip Technology PIC18F4221T-I/ML is an 8-bit CMOS Flash-based PIC microcontroller delivering 10 MIPS performance (40 MHz clock with 100 ns instruction execution) in a 44-pin QFN (8x8 mm) package. It integrates 4 KB (2K x 16) of Flash program memory, 512 bytes of RAM, and 256 bytes of EEPROM, supporting industrial-grade operation from -40C to +85C. An 8-bit microcontroller is a programmable system-on-a-chip that combines a CPU core, memory, and peripherals on a single silicon die. PIC microcontrollers (Programmable Intelligent Controllers) use a Harvard RISC architecture with only 77 single-word instructions, making them easy to program while delivering deterministic real-time performance. PIC18F family parts sit in the mid-range tier of the PIC portfolio, above baseline PIC16 and below PIC24/dsPIC, and are widely deployed in consumer, industrial, and automotive subsystems. Key features of the PIC18F4221 include 10 MIPS throughput, self-programmable Flash, an internal oscillator block, and a 10-bit ADC with up to 13 channels. It also supports multiple communication interfaces - I2C, SPI, and UART/USART - enabling easy integration with sensors, displays, and wireless modules. The integrated nanoWatt power management reduces quiescent current in sleep modes. The device uses Microchip's enhanced PIC18 architecture with a 16-bit wide instruction word and an 8-bit data path, providing code density comparable to 16-bit cores while preserving 8-bit pricing. The 44-QFN package exposes up to 36 I/O pins and supports in-circuit serial programming (ICSP) plus in-circuit debugging via two pins, allowing field firmware updates and on-board debug without removing the MCU. Typical applications include industrial control systems, sensor interface modules, small appliance controls, automotive body electronics, and low-cost consumer devices. The combination of low power, ample peripherals, and the PIC18 instruction set makes it a strong fit for cost-sensitive embedded designs. When designing with this part, plan for proper decoupling (100 nF on VDD close to each VDD pin plus a bulk 10 uF), use the internal RC oscillator when crystal accuracy is not critical, and leverage the nanoWatt sleep modes for battery-powered applications. Always reference the Microchip PIC18F4221 datasheet (DS39631) for errata and AC/DC timing. This page synthesizes distributor pricing, parametric alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single decision-ready reference.

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PIC18F4221T-I/PT - 8-bit 40MHz 4KB Flash MCU | Microchip
PIC18F4221T-I/PT

PIC18F4221T-I/PT - 8-bit 40MHz 4KB Flash MCU | Microchip

The Microchip Technology PIC18F4221T-I/PT is an 8-bit PIC18 microcontroller IC operating at up to 40 MHz with 4 KB (2K x 16) of Flash program memory, packaged in a 44-pin TQFP (10x10 mm) form factor. It is supplied in tape-and-reel packaging (suffix "T") and targets the industrial temperature range of -40C to +85C. What is an 8-bit PIC microcontroller? An 8-bit MCU (microcontroller unit) is a small computer-on-a-chip that processes data 8 bits at a time. PIC microcontrollers from Microchip use a RISC (Reduced Instruction Set Computer) architecture with a Harvard memory structure, separating program and data buses for fast, deterministic execution. Within the broader semiconductor taxonomy, PIC18F belongs to the PIC18 family of enhanced Flash microcontrollers, itself part of the 8-bit MCU category, which sits under embedded controllers and integrated circuits. PIC18F parts are widely used for low-power, cost-sensitive applications requiring simple peripherals and easy migration across pin counts. Key features of the PIC18F4221T-I/PT include 512 bytes of RAM, 256 bytes of EEPROM data memory, a 10-bit ADC with multiple channels, nanoWatt power-management technology for low-power sleep modes, and 36 digital I/O pins. The device supports supply voltages from 4.2V to 5.5V typical, includes an internal oscillator, multiple timers, USART, MSSP (I2C/SPI), and nanoWatt features for battery-friendly operation. Architecturally, the PIC18F4221 uses an enhanced RISC core with 77 single-word instructions, hardware multiplier, and 16-bit wide instruction words. The 40 MHz clock delivers up to 10 MIPS (100 ns instruction execution), with interrupt handling, context saving, and a priority interrupt controller for deterministic real-time response. Peripheral integration is mature and well documented across Microchip's toolchain, including MPLAB X IDE, XC8 compilers, and a broad library of application notes. Typical applications include industrial control, sensor interfaces, low-power remote controls, consumer appliances, automotive body and comfort modules, and USB-less embedded products where cost and power budget matter. The 36 I/O pins and 10-bit ADC also suit HMI (human-machine interface) front panels and instrument clusters. When designing with this part, plan for a minimum 1uF decoupling capacitor on VDD and place it within 5 mm of the supply pin. For low-power designs, leverage nanoWatt modes (Idle, Sleep, and Timer1 oscillator) and verify the ADC acquisition time against source impedance. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a faster path to a confident part selection.

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PIC18F4320-E/ML - 8-bit MCU, 8KB Flash, 44-QFN | Microchip
PIC18F4320-E/ML

PIC18F4320-E/ML - 8-bit MCU, 8KB Flash, 44-QFN | Microchip

The Microchip Technology PIC18F4320-E/ML is an 8-bit PIC microcontroller in the PIC18F family, integrating 8 KB of Flash program memory, 512 bytes of SRAM, and 256 bytes of EEPROM in a 44-pin QFN (8x8 mm) package with exposed thermal pad. It executes instructions at up to 25 MHz (40 MHz max on selected speed grades), delivering 10 MIPS while operating from 2.0 V to 5.5 V across the industrial temperature range of -40C to +125C. A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, and integrated peripherals such as timers, ADC, communication ports, and GPIO. The PIC18F family sits at the upper end of Microchip's 8-bit portfolio, offering an enhanced instruction set with C-friendly addressing, prioritized interrupts, and a 16-bit instruction word. Within the wider taxonomy, MCUs belong to embedded computing, which sits below microprocessors in the system hierarchy; the PIC18F family targets cost-sensitive real-time control rather than high-throughput digital signal processing. Key features include 36 digital I/O pins, 13 channels of 10-bit Analog-to-Digital converter (ADC), 2 analog comparators, 2 Capture/Compare/PWM modules, a master Synchronous Serial Port configurable as SPI or I2C, an Addressable Universal Asynchronous Receiver/Transmitter (AUSART), and self-programming Flash with In-Circuit Debug support. The device supports 1,000,000 erase/write cycles on Flash and 100,000 cycles on EEPROM, with 40-year data retention. The 'E' suffix indicates the extended (-40C to +125C) industrial temperature range, while the 'ML' suffix designates the 44-lead QFN package. The PIC18F4320 uses a Harvard RISC architecture with separate program and data buses, hardware multiply, and a 31-level stack, enabling deterministic real-time response. The 10-bit ADC integrates with the analog comparators for sensor conditioning, while the ECCP and CCP modules generate PWM for motor and power control. Self-programmability allows field firmware updates without an external programmer. Typical applications include industrial control, automotive body electronics, sensor interfacing, low-end motor control, and consumer appliances. The 44-QFN package suits space-constrained designs requiring up to 36 GPIO plus analog and serial connectivity. The PIC18F4320 pairs naturally with the PIC18F4220/4520 family siblings for upgrade/downgrade flexibility within the same 44-QFN footprint. When designing with this MCU, ensure adequate decoupling (100 nF ceramic per VDD pin) and route the exposed thermal pad to a continuous ground plane for thermal dissipation and low-impedance ground return. Verify ICP/ICD pin assignments against Microchip's programming specification to avoid debugger conflicts in production units. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the bare manufacturer datasheet.

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PIC18F4320-E/P - 8KB Flash 8-bit MCU, 40MHz, DIP-40 | Microchip
PIC18F4320-E/P

PIC18F4320-E/P - 8KB Flash 8-bit MCU, 40MHz, DIP-40 | Microchip

The Microchip Technology PIC18F4320-E/P is an 8-bit CMOS Flash-based PIC18 microcontroller in a 40-pin PDIP (DIP-40) package, delivering 10 MIPS performance with 40 MHz maximum clock speed. The -E suffix designates the extended industrial temperature grade of -40C to +125C, suitable for harsh-environment deployments. It integrates 8 KB of Flash program memory (4K x 16 words), 512 bytes of SRAM, and 256 bytes of EEPROM data memory. An 8-bit microcontroller (MCU) is a small computer-on-a-chip containing a CPU, RAM, non-volatile program memory, and peripherals. PIC18F microcontrollers belong to the enhanced mid-range PIC architecture, sitting between baseline PIC10/12/16 devices and PIC24/dsPIC 16-bit families. They execute one instruction per clock cycle, providing deterministic performance for embedded control. PIC18F4320-E/P fits this hierarchy as a general-purpose 8-bit MCU with nanoWatt power management. Key features include 36 digital I/O pins, 13 channels of 10-bit Analog-to-Digital conversion (10-bit ADC), two analog comparators, two Capture/Compare/PWM modules, and a synchronous serial port configurable as 3-wire SPI or 2-wire I2C. The device supports self-programming and In-Circuit Debugging (ICD) via two programming pins. nanoWatt Technology provides multiple power-managed modes - Run, Idle, and Sleep - with on-the-fly clock switching from a 31 kHz internal oscillator up to 40 MHz external. The architecture uses a Harvard bus with separate program and data paths, an 8-bit ALU, and a 16-bit instruction word. Four interrupt priority levels and a hardware multiplier (8x8 single-cycle) simplify real-time control loops. The 10-bit ADC supports 13 input channels with acquisition time configurable for precision conversion. Two USART modules plus the MSSP (Master Synchronous Serial Port) provide flexible wired communication. Typical applications include industrial control systems, automotive body electronics, sensor signal conditioning, motor control loops, HVAC thermostats, and consumer appliance interfaces. The 5V supply range and extended temperature grade also suit outdoor and factory-floor equipment. When designing, allocate the ICD pins (PGC/PGD) carefully - they must remain accessible for debug, and the MCLR pin needs a 10 kohm pull-up to VDD. The 40-pin PDIP footprint provides through-hole mechanical robustness for hand-prototyped and field-serviceable boards. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not aggregated on the manufacturer product page or in the standalone datasheet.

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PIC18F4320-E/PT - 8KB Flash MCU 40MHz 36 I/O TQFP-44 | Microchip
PIC18F4320-E/PT

PIC18F4320-E/PT - 8KB Flash MCU 40MHz 36 I/O TQFP-44 | Microchip

The Microchip Technology PIC18F4320-E/PT is an 8-bit PIC18 RISC Flash microcontroller delivering 10 MIPS performance at 40 MHz, packaged in a 44-pin TQFP (PT) with 36 user I/O lines. According to the Microchip product page, it integrates 8 KB of self-programmable Flash program memory, 512 bytes of SRAM, 256 bytes of EEPROM, and an enhanced 16-bit instruction set that is upwards compatible with PIC16C5X, PIC12CXXX, PIC16CXX, and PIC17CXX devices. What is a PIC18 Flash microcontroller? PIC18F-series devices are 8-bit CMOS RISC microcontrollers from Microchip Technology built around an enhanced Harvard architecture with separate program and data buses. They sit in the broader taxonomy microcontroller -> embedded processor -> semiconductor IC, and are widely adopted in cost-sensitive embedded designs because of their deterministic instruction timing, low power nanoWatt Technology, and rich peripheral integration. Key features include 13 channels of 10-bit Analog-to-Digital conversion, two analog comparators, two Capture/Compare/PWM modules, a synchronous serial port configurable as either 3-wire SPI or 2-wire I2C, an Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART), and an in-circuit debugger (ICD) interface. Operating voltage spans 4.2 V to 5.5 V across the extended -40C to +125C industrial temperature range, suitable for industrial and automotive-grade environments. The architecture combines a 16-bit instruction word with an 8-bit data path, providing 77 single-word instructions and C-compiler-friendly addressing modes. Self-programming capability enables field firmware updates, while the ICD interface simplifies in-system debug. nanoWatt Technology provides ultra-low-power sleep modes (<100 nA typical) for battery-backed designs. Typical applications include industrial control systems, HVAC sensor interfaces, automotive body controllers, consumer appliance controllers, and USB-to-serial bridges when paired with the PIC18F2550/4550 family. The 36 I/O lines comfortably drive keypad scanning, character LCDs, and multi-drop RS-485 nodes. When designing with the PIC18F4320-E/PT, ensure the 5 V rail is regulated within 4.2 V to 5.5 V to prevent Flash programming failures, place decoupling capacitors within 5 mm of each VDD/VSS pair, and use Microchip's MPLAB X IDE with MPLAB XC8 compiler for firmware development. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design guidance compiled from the Microchip datasheet, DigiKey inventory, and Mouser listings as of 2026-09-27.

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PIC18F4320-I/P - 8-Bit 40MHz 8KB Flash MCU 40-PDIP | Microchip
PIC18F4320-I/P

PIC18F4320-I/P - 8-Bit 40MHz 8KB Flash MCU 40-PDIP | Microchip

The Microchip Technology PIC18F4320-I/P is an 8-bit CMOS Flash microcontroller belonging to the PIC18F family, delivering up to 10 MIPS (40 MHz) instruction throughput from an 8 KB (4K x 16) enhanced Flash program memory and 512 bytes of SRAM, packaged in a 40-pin PDIP through-hole form factor (0.600 inch / 15.24 mm). It is offered in the industrial temperature range (I suffix, -40C to +85C) and operates from 2.0 V to 5.5 V across 36 digital I/O pins. What is a PIC microcontroller? A Microcontroller Unit (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, non-volatile storage, and a rich set of peripherals (ADC, timers, communications, comparators). PIC microcontrollers from Microchip use a Harvard RISC architecture that separates program and data buses, allowing simultaneous fetch and execute of instructions and producing deterministic interrupt latency that is widely favored in real-time control. The PIC18 series extends PIC16 code with 16-bit instructions, linear memory, and C-compiler friendly extensions that simplify firmware development using MPLAB XC8 and the free MPLAB IDE toolchain. Key features include 256 bytes of EEPROM, self-programming capability for in-application firmware updates, an ICD (In-Circuit Debugger) interface, two CCP modules for capture/compare/PWM, a 10-bit Analog-to-Digital Converter with up to 13 input channels, two analog comparators, and a Master Synchronous Serial Port configurable as 3-wire SPI or 2-wire I2C. The nanoWatt Technology power-management suite provides multiple idle and sleep modes that drop run currents below typical values for battery-friendly designs. With 36 digital I/O on the 40-pin variant, the PIC18F4320-I/P delivers a higher pin density than the 28-pin members of the family while sharing the same PIC18 core, peripheral set, and toolchain. Architecturally the device uses an enhanced 8-bit CPU with 77 single-word instructions, hardware multiplier, and prioritized interrupts with shadow registers. Memory is organized as a 16-bit-wide program Flash accessed through a 21-bit PC, plus 16-bit-wide file-register SRAM. Brown-out Reset, Watchdog Timer with its own on-chip RC oscillator, and a wide operating-voltage range protect against supply glitches and code runaway in unattended installations. Typical applications include industrial automation and process control nodes, sensor signal conditioning with the 10-bit ADC, motor control using CCP PWM outputs, automotive body and interior subsystems on 12 V buses (down-regulated), low-power remote sensor platforms, educational and hobbyist development boards, and USB/serial bridge firmware for legacy serial peripherals. The through-hole 40-pin PDIP is also widely used in breadboard prototyping and educational labs where SOIC/QFN parts are inconvenient. A key design consideration is that the PIC18F4320 family is mature and the -I/P variant is preferred over the -E/P extended-temperature variant for industrial-cost applications; for newer designs with more memory or peripherals, Microchip recommends the PIC18F46K22, PIC18F46K40, or PIC18F46Q10 families, which are software-compatible and pin-compatible in many cases while consuming less power and adding PPS (Peripheral Pin Select). This page synthesizes distributor pricing, drop-in PIC18F-family alternatives, and practical design notes drawn from Microchip datasheet DS39582B and the PIC18F4320 product page.

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PIC18F4320-I/PT - 8KB Flash 8-bit MCU, 40MHz, 44-TQFP | Microchip
PIC18F4320-I/PT

PIC18F4320-I/PT - 8KB Flash 8-bit MCU, 40MHz, 44-TQFP | Microchip

The Microchip PIC18F4320-I/PT is an 8-bit CMOS Flash-based microcontroller from the PIC18 family, featuring 8KB of Flash program memory, 512 bytes of SRAM, and 256 bytes of EEPROM, operating at up to 40 MHz (10 MIPS) in a 44-pin TQFP (10x10 mm) package. The device integrates 13 channels of 10-bit Analog-to-Digital conversion, 2 analog comparators, 2 Capture/Compare/PWM modules, and a configurable synchronous serial port that supports both 3-wire SPI and 2-wire I2C interfaces. The -I temperature grade indicates an industrial -40C to +85C operating range suitable for commercial and industrial embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals around an 8-bit data bus. The PIC18 family is Microchip's high-performance 8-bit tier, sitting above the PIC16 baseline and PIC12/14 mid-range parts in computational throughput, and below the 16-bit PIC24/dsPIC families in arithmetic horsepower. Within the broader taxonomy, an 8-bit MCU belongs to microcontrollers -> embedded processors -> semiconductors. Compared with 32-bit ARM Cortex-M0 parts, 8-bit PIC MCUs offer lower unit cost, simpler toolchains, and deterministic interrupt latency, at the expense of raw compute and addressable memory. They remain the preferred choice for cost-sensitive, low-power, and peripheral-rich applications such as appliance control, sensor hubs, and human-interface panels. The PIC18F4320 delivers up to 10 MIPS at 40 MHz from a 4.0-5.5V supply and includes enhanced peripherals such as a 10-bit ADC with up to 13 input channels, dual analog comparators with programmable reference, two CCP modules for PWM or capture/compare, an addressable USART, an MSSP configurable as SPI master/slave or I2C, and nanoWatt power-management features. It supports self-programming via ICSP and includes an ICD (In-Circuit Debug) interface, enabling in-field firmware updates and on-board debug without a special bondout package. Typical applications for this device include industrial control panels, sensor signal conditioning, low-cost motor control via PWM, HVAC damper/valve actuators, appliance user-interface boards, and USB-to-UART bridges when paired with an external USB transceiver. The 36 I/O pins provide ample headroom for keypads, LEDs, character LCDs, and multiple sensor inputs in a single-chip design. When designing with the PIC18F4320, verify that the 5V-tolerant I/O budget matches your sensor interface, and use the internal 8 MHz oscillator for cost-down designs that can tolerate +/-2% frequency accuracy. This page synthesizes distributor stock, drop-in PIC18 family alternatives, and application guidance not aggregated in any single manufacturer document.

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PIC18F4320T-I/ML - 8KB Flash 8-bit MCU, 44-VQFN | Microchip
PIC18F4320T-I/ML

PIC18F4320T-I/ML - 8KB Flash 8-bit MCU, 44-VQFN | Microchip

The Microchip Technology PIC18F4320T-I/ML is a high-performance, 8-bit CMOS Flash-based microcontroller in the PIC18 family, packaged in a 44-pin VQFN with exposed pad (8x8 mm) and supplied in tape-and-reel format. The device delivers 10 MIPS performance (100 ns instruction execution), packs 8 KB of Flash program memory and 512 bytes of RAM, and exposes up to 36 I/O pins. The core runs from an internal 40 MHz oscillator with 4x PLL option across an operating voltage range of 2.0V to 5.5V, making it suitable for both 3.3V and 5V designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripheral interfaces and I/O onto one silicon die. Within the broader semiconductor taxonomy, the PIC18F4320 belongs to the 8-bit microcontroller class, which sits beneath 16-bit and 32-bit MCU families, and ultimately under the embedded processing branch of the power-management-and-control semiconductor hierarchy. The 'PIC' prefix denotes Microchip's Peripheral Interface Controller architecture - a Harvard RISC design with separate program and data buses that allows simultaneous fetch and execute cycles. Key features include a 10-bit ADC with up to 13 input channels, a 16-bit enhanced capture/compare/PWM module, two USART ports, an SPI/I2C master/slave MSSP peripheral, and the nanoWatt Technology power-managed sleep modes that drop quiescent current into the nanoampere range. The integrated watchdog timer and brown-out reset provide field-grade robustness, while the 10-bit ADC supports touch-sensing and sensor-signal conditioning without an external analog front end. Architecturally, the PIC18F4320 uses a 16-bit instruction word with 77 single-word instructions, of which most execute in a single instruction cycle. The Flash program memory supports self-programming via ICSP, allowing field firmware updates. The 36 high-current I/O pins can source/sink up to 25 mA each, directly driving LEDs and small relays. Typical applications include industrial control panels, motor control drivers, sensor-interface boards, low-power battery instrumentation, USB-to-UART bridges, smart sensor nodes, and consumer white goods. The 44-VQFN package suits compact SMD layouts where board space is constrained. When designing with this part, choose the 44-VQFN footprint when the PCB must stay compact and accept heat-sinking through the exposed pad; allocate the EPAD to a continuous copper pour for thermal dissipation and signal-return integrity. The 8 KB Flash ceiling is the primary constraint for code size. This page synthesizes distributor pricing, drop-in alternative cross-references, and applied design notes not found in the manufacturer datasheet alone, giving engineers a one-stop reference for PIC18F4320T-I/ML sourcing and design decisions.

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PIC18F4320T-I/PT - 8KB Flash 8-bit MCU 40MHz TQFP-44 | Microchip
PIC18F4320T-I/PT

PIC18F4320T-I/PT - 8KB Flash 8-bit MCU 40MHz TQFP-44 | Microchip

The Microchip Technology PIC18F4320T-I/PT is an 8-bit PIC18F-series CMOS Flash microcontroller (MCU) delivering 10 MIPS throughput at 40 MHz clock and integrating 8 KB Flash program memory, 512 bytes SRAM and 256 bytes EEPROM in a 44-pin TQFP (10x10 mm) package. It features a 10-bit A/D converter with up to 13 input channels, 36 digital I/O pins, nanoWatt power-management technology, and is tape-and-reel packaged (the "T" suffix) for high-volume surface-mount assembly. The part operates from 4.2 V to 5.5 V across the industrial -40C to +85C range. A microcontroller (MCU) is a single-chip computer containing a CPU, RAM, non-volatile program memory, and peripherals such as timers, communication interfaces and ADCs. PIC18F-series parts sit in the 8-bit microcontrollers tier of the broader semiconductor hierarchy and are widely used for cost-sensitive embedded control. nanoWatt Technology is Microchip's family of dynamic power-management modes that reduce quiescent current during idle or sleep states to extend battery life. Key features include 77 single-word instructions, an enhanced 16-bit instruction set, hardware multiplier, two 8-bit timers plus three 16-bit timers, a 10-bit ADC with up to 13 channels, and capture/compare/PWM (CCP) modules. The internal RC oscillator and wide operating voltage simplify designs by eliminating external clock components. PIC18F devices are supported by Microchip's MPLAB X IDE and XC8 compiler, providing a mature development ecosystem. Typical applications include industrial control, consumer white goods, sensor signal conditioning, low-end human-machine interface (HMI), automotive body and aftermarket subsystems, and USB-to-UART bridges when paired with the PIC18F4550 family variant. With 36 I/O and 13 ADC channels the PIC18F4320 supports medium-density I/O designs that need modest processing. When designing with this device, ensure VDD decoupling is placed close to the pins, leave MCLR accessible for in-system programming, and budget for a 5 V supply since the ADC reference and operating range require 4.2 V minimum. Compare against the 28-pin PIC18F2220 or 40-pin PIC18F4220 siblings when pin count or memory differ. The PIC18F4320T-I/PT is widely stocked in distribution. The "T" suffix indicates tape-and-reel packaging and "I" denotes the industrial temperature grade. This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical design guidance not aggregated on the manufacturer datasheet.

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PIC18F4321-E/ML - 8-Bit MCU, 8KB Flash, 25MHz, 44-QFN | Microchip
PIC18F4321-E/ML

PIC18F4321-E/ML - 8-Bit MCU, 8KB Flash, 25MHz, 44-QFN | Microchip

The Microchip Technology PIC18F4321-E/ML is an 8-bit PIC18F-series CMOS Flash microcontroller delivering 10 MIPS performance (40 MHz oscillator, 25 MHz instruction rate) with 8 KB of Flash program memory, 512 bytes of SRAM, and 256 bytes of EEPROM, housed in a 44-pin QFN (8x8 mm) exposed-pad package. The -E temperature grade extends the operating range to -40C to +125C, making it suitable for industrial and harsh-environment applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripheral set on one die. The PIC18F family uses an enhanced Harvard RISC architecture with 16-bit opcodes and 8-bit data path, executing one instruction every four oscillator cycles. Within the broader taxonomy, PIC18F sits above PIC16F and below PIC24/dsPIC as the high-performance tier of Microchip's 8-bit portfolio. Key features include 13 channels of 10-bit ADC (up to 100 ksps), two analog comparators, two CCP modules supporting capture/compare/PWM, an EUSART, MSSP configurable for SPI or I2C (master/slave), a 36-pin I/O port set, and nanoWatt power management with multiple idle/sleep modes. The 77 single-word instruction set and C-compiler-friendly architecture simplify code migration from PIC16 and PIC12 devices, while self-programming and ICD support enable in-circuit firmware updates and debugging. The architecture combines a 16-bit wide instruction bus with an 8-bit data bus, achieving 10 MIPS at 40 MHz while consuming as little as a few microamps in sleep mode. The 10-bit successive-approximation ADC with 13 input channels supports up to 100 ksps conversion rate, sufficient for sensor monitoring, battery management, and motor-control feedback loops. The internal RC oscillator eliminates the need for an external crystal in cost-sensitive designs. Typical applications include industrial control (sensor hubs, PLC I/O modules, motor drivers), automotive body and HVAC subsystems, consumer appliance control panels, battery management systems, and USB-to-UART bridge devices. The wide 4.2V-5.5V supply range and 25 MHz performance make it well suited for 5V logic systems where lower-voltage ARM Cortex-M0 parts are not appropriate. When designing with this MCU, allocate at least one timer to a free-running tick for RTOS or cooperative scheduling, and configure the ADC acquisition time based on source impedance (typ. 15-20 us for 10 kohm sources). For low-power designs, place the device in Sleep or Idle mode between sensor reads and use the EUSART wake-up feature for asynchronous command processing. This page synthesizes distributor pricing across DigiKey and Mouser, drop-in PIC18F4321 family alternatives sharing the 44-QFN footprint, and practical design notes for low-power embedded development that are not consolidated on the manufacturer datasheet.

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PIC18F4321-E/P - 8-bit PIC MCU, 8KB Flash, 25MHz, 40-PDIP | Microchip
PIC18F4321-E/P

PIC18F4321-E/P - 8-bit PIC MCU, 8KB Flash, 25MHz, 40-PDIP | Microchip

The Microchip Technology PIC18F4321-E/P is an 8-bit CMOS Flash-based RISC microcontroller in a 40-pin PDIP package, featuring 8KB of program Flash, 512 bytes of RAM, and 256 bytes of EEPROM. It executes instructions at 10 MIPS (100 ns instruction cycle) from a 25 MHz internal clock and is built on the PIC18 enhanced Harvard architecture with 77 single-word instructions. The device supports an extended operating temperature range from -40C to +125C, indicated by the "/E" industrial suffix in the part number. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals, serving as the embedded "brain" in countless electronic products. Within Microchip's taxonomy, the PIC18F family sits in the high-performance tier of the 8-bit PIC family, above PIC10/12/16 baseline and mid-range parts and below the PIC24/dsPIC 16-bit family. The "F" in PIC18F denotes Flash program memory, supporting in-circuit serial programming (ICSP) and self-programming, while the "32" segment identifies the program-memory class within the family. Key features include 13 channels of 10-bit Analog-to-Digital conversion, 2 analog comparators, 2 Capture/Compare/PWM (CCP) modules, an Enhanced CCP (ECCP) for motor control or full-bridge drive, an MSSP configurable as SPI or I2C, two USART modules, and nanoWatt Technology for ultra-low-power sleep modes. The 40-pin PDIP package provides generous I/O count with 36 digital I/O pins and exposes all major peripherals for breadboard-friendly prototyping. Architecture-wise, the PIC18F4321 uses an 8-bit data path with a 16-bit instruction word, a hardware multiplier for 8x8 single-cycle multiplication, and a vectored interrupt controller with prioritized interrupts. The 10-bit ADC supports up to 13 channels with automatic acquisition and conversion, suitable for sensor reading at moderate rates. The nanoWatt Technology manager offers multiple idle and sleep modes that reduce quiescent current to the microampere range, supporting battery-powered designs. Typical applications include industrial sensor interfaces, low-power remote data loggers, HVAC controller boards, appliance control panels, HVAC thermostats, motor-driver supervisory boards, and educational microcontroller platforms. The 25 MHz operation and 8KB Flash are well-matched to mid-complexity control loops, communication bridges, and sensor fusion tasks. Designers favor this part for its DIP package which simplifies hand-soldered prototypes and rework, and for the broad ecosystem of MPLAB X IDE, MCC code configurator, and XC8 compiler support. Design consideration: although the -E/P variant is rated -40C to +125C, the lower "-I" grade (PIC18F4321-I/P, -40C to +85C) is more widely stocked; verify the temperature requirement before procurement. When designing with the ADC, ensure acquisition time meets source-impedance requirements or add an external buffer. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on standard manufacturer distributor listings.

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PIC18F4321-I/ML - 8-bit 40MHz 8KB Flash MCU | Microchip QFN-44
PIC18F4321-I/ML

PIC18F4321-I/ML - 8-bit 40MHz 8KB Flash MCU | Microchip QFN-44

The Microchip Technology PIC18F4321-I/ML is a C compiler-friendly, 8-bit CMOS Flash microcontroller delivering 10 MIPS (100 ns instruction execution) from an enhanced PIC18 RISC architecture, packaged in a 44-pin QFN (ML) form factor. It integrates 8 KB of Flash program memory (4K x 16), 512 bytes of SRAM, 256 bytes of EEPROM, and a 13-channel 10-bit Analog-to-Digital converter, all operating at up to 40 MHz from a 4.2 V to 5.5 V supply. A microcontroller (MCU) is a single-chip computer containing a CPU, program memory, working RAM, non-volatile storage, and programmable peripherals. Within the broader semiconductor taxonomy, the PIC18F4321 belongs to the 8-bit microcontroller family (hypernyms: microcontroller -> MCU -> embedded processor -> semiconductor), and the PIC18 sub-family specifically targets mid-range applications that need higher code density, C-language efficiency, and richer analog/digital peripherals than the baseline PIC16 line. Key differentiating features include nanoWatt Technology for power-managed sleep modes, two analog comparators with dedicated reference ladder, two Capture/Compare/PWM (CCP) modules, a synchronous serial port configurable as 3-wire SPI or 2-wire I2C, an enhanced USART, and self-programming capability for in-field firmware updates. The device also integrates an ICD (In-Circuit Debugger) interface, eliminating the need for an external emulator on many prototype boards. Architecturally, the PIC18F4321 uses a Harvard-class 16-bit instruction word fetched over an 8-bit data bus, which - combined with the 77-instruction set - gives C compilers deterministic code generation and avoids the bank-switching friction seen on legacy PIC16 designs. The 36 I/O pins tolerate 5 V logic and drive both LED and small-signal relays directly. Typical applications include industrial sensor conditioning, USB/HID interfaces, environmental data loggers, small motor control loops (PWM plus comparators), and low-power battery instruments. In battery-powered sensor nodes the nanoWatt idle current allows multi-year coin-cell operation when the CPU is duty-cycled by an RTCC wake-up. A key design consideration is supply bypassing: place a 100 nF ceramic plus 10 uF tantalum within 5 mm of VDD, and provide a low-impedance ground plane under the QFN thermal/exposed pad (EP), which must be soldered to the ground plane to meet the 4.2 V minimum supply at full 40 MHz clock rate. This page combines verified distributor pricing, drop-in same-family alternatives (PIC18F4221, PIC18F4331, PIC18LF4321), and practical design notes for industrial-grade embedded designs using the PIC18F4321-I/ML.

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PIC18F4321T-I/ML - 8KB Flash 8-bit MCU 40MHz QFN-44 | Microchip
PIC18F4321T-I/ML

PIC18F4321T-I/ML - 8KB Flash 8-bit MCU 40MHz QFN-44 | Microchip

The Microchip Technology PIC18F4321T-I/ML is a CMOS Flash-based 8-bit PIC microcontroller from the PIC18F family, featuring 8KB (4K x 16) of Flash program memory, 512 bytes of RAM, and 256 bytes of data EEPROM. It delivers 10 MIPS performance at 40 MHz clock with a 100 nanosecond instruction execution cycle, in a 44-pin VQFN (8x8) exposed-pad package. The device supports an industrial temperature range (-40C to +85C) and operates from 2.0V to 5.5V, making it suitable for 5V and 3.3V embedded designs. An 8-bit microcontroller (MCU) is a programmable integrated circuit that executes instructions from on-chip program memory while interacting with peripherals through digital and analog I/O pins. The PIC18F family sits above PIC16 in Microchip's 8-bit hierarchy, offering enhanced peripherals and nanoWatt power management. Architecturally, an 8-bit MCU typically includes a CPU core, Flash program memory, SRAM for data, EEPROM for non-volatile storage, timers, ADC, communication peripherals, and GPIO. PIC18F devices extend the baseline PIC16 instruction set with 16-bit instructions and a hardware multiplier for C-friendly code generation. The PIC18F4321 features 36 digital I/O pins, a 10-bit ADC with multiple channels, multiple capture/compare/PWM modules, USART, MSSP (I2C/SPI), and nanoWatt Technology power management for sleep/idle modes. The 44-pin VQFN exposed-pad package provides a compact footprint and a thermal dissipation path for the silicon die through the EP. This microcontroller is well suited for industrial control nodes, sensor signal conditioning, motor control, low-power battery devices, and consumer appliances where the PIC18 ecosystem of MPLAB X, XC8 compiler, and a broad library of code examples reduces time-to-market. The device is also a strong candidate for legacy PIC18F4321 designs migrating from PDIP to a smaller QFN footprint. In designs, ensure the exposed pad is soldered to a sufficient copper pour for thermal dissipation, and follow Microchip's QFN land-pattern guidelines. The ICSP programming pins must remain accessible for in-circuit programming and debugging.

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PIC18F4331-E/P - 8-bit MCU, 8KB Flash, 40MHz, 40-PDIP | Microchip
PIC18F4331-E/P

PIC18F4331-E/P - 8-bit MCU, 8KB Flash, 40MHz, 40-PDIP | Microchip

The Microchip PIC18F4331-E/P is an 8-bit enhanced flash microcontroller from the PIC18F family, delivering 40 MIPS performance at 40 MHz, 8 KB of on-chip flash program memory and 768 bytes of RAM, all housed in a 40-pin PDIP through-hole package. It operates from a 4.2 V to 5.5 V supply and integrates 36 digital I/O lines, a 10-bit A/D converter with up to 9 channels, a 14-bit Power Control PWM module with up to 8 channels, two analog comparators, and the nanoWatt power-managed feature set for sleep modes with sub-µA currents. An 8-bit microcontroller (MCU) is a programmable processor with an internal 8-bit data path, on-chip flash for code storage, RAM for volatile data, and a peripheral set including timers, communications and analog blocks. PIC18F devices sit in the PIC family hierarchy between the smaller PIC16F MCUs and the larger PIC24/dspIC devices, and they target motor-control, sensor and industrial-automation applications that need DSP-like PWM peripherals without leaving the 8-bit architecture. The PIC18F4331 specifically targets AC induction motor and BLDC drives through its integrated Power Control PWM and quadrature encoder interface. Key features that differentiate this part include the integrated 14-bit resolution Power Control PWM (up to 8 PWM channels with complementary outputs and programmable dead time), an integrated quadrature encoder interface for closed-loop motor commutation, two analog comparators with reference ladders, and the nanoWatt power-managed modes (Idle, Sleep, and a low-power Timer1 oscillator) that allow battery-backed designs. The 'E' suffix indicates the extended industrial temperature grade of -40 °C to +125 °C, while the '/P' suffix denotes the 40-pin PDIP package. Technically, the device uses a Harvard RISC architecture with a 16-bit instruction word and 8-bit data path, providing 16-bit opcode efficiency while keeping the data bus compact. The flash memory supports 100k erase/write cycles typical, and the part retains data for 40 years minimum. On-chip peripherals are mapped through a flexible PPS-like scheme (PIC18F4331 has fixed peripheral pin mapping), and the device is supported by the MPLAB X IDE, MPLAB XC8 compiler, and the MPLAB ICD in-circuit debuggers. Typical applications include motor control (BLDC, PMSM, AC induction), power conversion (UPS, PFC boost converters), industrial automation with encoder feedback, LED lighting control, and embedded control in industrial sensor hubs. The integrated quadrature encoder and PWM make it particularly well suited for variable-frequency drives. When designing with this device, choose a switching frequency between 1 kHz and 20 kHz for PWM to balance audible noise and switching losses, and ensure the analog supply (AVDD) is decoupled with a 0.1 µF + 10 µF pair close to the pin. The PDIP package simplifies hand prototyping and breadboarding, while the QFN/ML variants of the same die target space-constrained production designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond what is in the bare manufacturer datasheet, including cross-family replacements and tooling guidance.

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PIC18F4331-I/ML - 8-bit MCU, 40MHz, 8KB Flash, 44-QFN | Microchip
PIC18F4331-I/ML

PIC18F4331-I/ML - 8-bit MCU, 40MHz, 8KB Flash, 44-QFN | Microchip

The Microchip Technology PIC18F4331-I/ML is an 8-bit PIC18 microcontroller delivering 40 MIPS performance at 40 MHz clock speed, packaged in a 44-pin QFN (8x8 mm) with exposed thermal pad. The device integrates 8 KB Flash program memory, 768 bytes RAM, and 256 bytes EEPROM, providing a balance of code density and SRAM headroom for motor-control and sensor-processing firmware. An 8-bit microcontroller (MCU) is a programmable processor core with an 8-bit data path, optimized for deterministic real-time control. Within the broader hierarchy, PIC18F4331 belongs to microcontrollers -> microprocessors -> semiconductor devices -> integrated circuits. Its architectural siblings include the 28-pin PIC18F2331 and 40-pin PIC18F4431, which share the same peripherals but differ in pin count and package. The PIC18 family uses an enhanced Harvard architecture with separate code and data buses, supporting 16-bit instructions and 8-bit data operations for efficient C and assembly code generation. Key features include a 14-channel 10-bit ADC with up to 100 ksps conversion rate, three on-chip hardware PWM modules (10-bit/14-bit resolution, 4 channels), dual analog comparators with rail-to-rail inputs, nanoWatt power management, and a 16-bit Capture/Compare/PWM (CCP) module. The integrated 40 MHz internal oscillator with PLL reduces external component count, while 34 digital I/O pins support 5V-tolerant operation. Communication peripherals include I2C, SPI, and USART with 9-bit address detection. The PIC18F4331 is engineered for closed-loop applications where the ADC and PWM must run concurrently with low jitter. The three independent PWM channels can generate complementary outputs with programmable dead-band delay, eliminating shoot-through in half-bridge motor drivers. The 10-bit ADC's 100 ksps throughput enables 10 kHz current sampling in field-oriented control (FOC) loops, while the 768-byte RAM holds two full three-phase SVM lookup tables plus the PI controller state. Typical applications include brushless DC (BLDC) motor controllers, switched-mode power supplies (SMPS) digital control loops, HVAC fan and pump controllers, LED lighting drivers with constant-current regulation, and small industrial sensor interfaces. The 4.2V to 5.5V supply range aligns directly with rectified mains-derived 5V rails common in appliance-class designs. When designing with the PIC18F4331-I/ML, route the exposed pad (EP) to a continuous ground pour with at least 8 thermal vias to dissipate ~1W peak dissipation in high-PWM workloads. Keep the 40 MHz crystal traces under 5 mm and isolate them from the PWM output traces to avoid coupling into the gate-driver signals. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical PCB layout notes that are not consolidated on any single distributor listing for the PIC18F4331-I/ML.

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PIC18F4331-I/PT - 8-bit 40MHz MCU 8KB Flash 44-TQFP | Microchip
PIC18F4331-I/PT

PIC18F4331-I/PT - 8-bit 40MHz MCU 8KB Flash 44-TQFP | Microchip

The Microchip Technology PIC18F4331-I/PT is an 8-bit PIC18F family microcontroller with 40 MHz maximum clock speed, 8 KB (4K x 16) of enhanced flash program memory, 768 bytes of RAM, and 256 bytes of EEPROM, housed in a 44-pin TQFP (10x10 mm) package. It integrates a 10-bit A/D converter, a high-performance Power Control PWM module, and 36 I/O pins, all operating from a 4.2 V to 5.5 V supply. A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory, data RAM, and peripherals on one integrated circuit. The PIC18F family represents Microchip's enhanced 8-bit architecture, positioned between the baseline PIC10/12/16 families and the 16-bit PIC24/dsPIC families. Within this hierarchy, the PIC18F4331 belongs to the PIC18F4331/4431 sub-family, which targets motor control and power conversion applications. These MCUs fall under the broader category of embedded microcontrollers -> microcontrollers -> integrated circuits -> semiconductors. Key differentiating features include nanoWatt Technology for power-managed sleep modes, a 14-bit resolution Power Control PWM (PCPWM) module with up to 8 channels, a 10-bit A/D converter with up to 9 channels, and a hardware multiplier for 8x8 single-cycle operations. The 44-pin TQFP package provides 36 digital I/O pins plus dedicated analog, PWM, and communication peripheral pins. The integrated Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART) and Master I2C/SPI interfaces enable communication with external sensors, motor drivers, and displays. Architecturally, the PIC18F4331 uses a 16-bit instruction word modified Harvard architecture with separate program and data buses. The 40 MHz oscillator drives a four-phase instruction pipeline that delivers up to 10 MIPS throughput, sufficient for closed-loop motor control algorithms. The dedicated Power Control PWM block supports complementary PWM outputs with programmable dead-band delay, hardware fault inputs, and a 14-bit resolution suitable for variable-frequency drive and UPS applications. This combination of peripherals eliminates the need for external PWM controllers and reduces overall BOM cost in motor drive designs. Typical applications include brushless DC (BLDC) motor drives, three-phase induction motor control, switched-mode power supplies with power-factor correction, uninterruptible power supplies (UPS), and industrial variable-frequency drives. The 8 KB flash is sufficient for small motor-control state machines, sensored or sensorless commutation algorithms, and basic power-supply control loops. When designing with this MCU, ensure the decoupling network follows Microchip's reference design with at least one 100 nF ceramic capacitor per power pin and a 10 uF bulk capacitor on VDD. The PCPWM module requires careful configuration of the PWM period, dead-band delay, and fault input polarity to prevent shoot-through in the half-bridge. The In-Circuit Debugger (ICD) or MPLAB PICkit programmer should be reserved with the standard RJ-11 ICSP header. This page synthesizes distributor pricing, same-brand drop-in alternatives from Microchip's PIC18F family, and practical design notes that go beyond the manufacturer datasheet. Engineers can use the comparison_table below to evaluate PIC18F4331-I/PT against same-package PIC18F4431-I/PT (more flash), PIC18F4321-I/PT, and PIC18F4320-I/PT substitutes for legacy designs.

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PIC18F4331T-I/ML - 8-bit PIC MCU, 8KB Flash, 44-QFN | Microchip
PIC18F4331T-I/ML

PIC18F4331T-I/ML - 8-bit PIC MCU, 8KB Flash, 44-QFN | Microchip

The Microchip Technology PIC18F4331T-I/ML is an 8-bit enhanced Flash microcontroller based on the PIC18 RISC architecture, offering 8 KB of Flash program memory, 768 bytes of RAM, and 256 bytes of EEPROM, housed in a 44-pin QFN (8x8 mm) package with exposed pad for enhanced thermal dissipation. It operates at a maximum clock speed of 40 MHz and is qualified for the industrial temperature range of -40C to +85C. The "T" suffix indicates Tape & Reel packaging, while "I/ML" specifies the industrial temperature grade and QFN package. What is a PIC18 microcontroller? The PIC18F family is Microchip's high-performance 8-bit microcontroller line, positioned between the baseline PIC10/12/16 families and the 16-bit dsPIC/PIC24 families. PIC18F devices use an enhanced Harvard architecture with a 16-bit instruction word, 8-bit data path, hardware multiplier, and C-friendly compiler support via MPLAB XC8. They form part of the broader microcontroller category, sitting between 8-bit AVR/8051 derivatives and 32-bit ARM Cortex-M0 cores in performance and power. Key features include a 14-channel, 10-bit Analog-to-Digital Converter (ADC), three programmable power-managed operating modes (Run, Idle, Sleep) with nanoWatt technology for low-power operation, a high-performance 14-bit PWM module with up to 6 PWM outputs designed for motor control, a Capture/Compare/PWM (CCP) module, an Enhanced USART, MSSP (SPI/I2C), and 34 digital I/O pins. The device supports ICSP (In-Circuit Serial Programming) and ICD (In-Circuit Debugging) via MPLAB tools. The PIC18F4331 incorporates dedicated motor-control peripherals including a Power Control PWM module with complementary outputs, dead-band control, and fault inputs—making it a true single-chip solution for brushless DC (BLDC), permanent magnet synchronous motor (PMSM), and AC induction motor drives. The architecture includes a hardware multiplier and 32-level stack supporting structured C code with deep call nesting. Typical applications include three-phase BLDC and PMSM motor controllers, sensorless and sensored motor drives for pumps/fans/HVAC blowers, industrial variable-frequency drives, ceiling fans and small appliances, power tools, and small-format uninterruptible power supplies. The integrated 14-bit PWM reduces BOM by eliminating external PWM generator ICs. When designing with the PIC18F4331T-I/ML, allocate a ground pad via the exposed pad (EP) on pin 44, which must be soldered to a copper pour for thermal dissipation and electrical grounding. Decouple VDD with 100 nF + 10 uF ceramic capacitors placed within 5 mm of the supply pins. Use the internal 8 MHz oscillator with PLL for 40 MHz operation, or an external crystal for timing-critical motor control loops. This page synthesizes distributor pricing, drop-in alternatives (PIC18F4331-I/ML, PIC18F4431T-I/ML, PIC18F2331-I/ML and others), and practical design notes not consolidated in the Microchip datasheet.

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PIC18F43K20-E/ML - 8KB Flash 8-bit MCU, 44-pin QFN | Microchip
PIC18F43K20-E/ML

PIC18F43K20-E/ML - 8KB Flash 8-bit MCU, 44-pin QFN | Microchip

The Microchip Technology PIC18F43K20-E/ML is an 8-bit enhanced flash microcontroller from the PIC18F K-series family, integrating 8 KB of flash program memory, 768 bytes of SRAM, and 256 bytes of EEPROM in a 44-pin QFN (8x8 mm) package with exposed thermal pad. It is built around an enhanced PIC18 RISC core running up to 64 MHz (16 MIPS) and operates over a 1.8V to 3.6V supply range, with nanoWatt power management features that drop quiescent current below 100 nA in sleep mode. The MCU also integrates a 10-bit ADC with up to 14 channels, multiple Enhanced Capture/Compare/PWM (ECCP) modules, and supports USB, SPI, I2C and USART connectivity through its 36 available I/O pins. An 8-bit PIC microcontroller is a Harvard-architecture RISC device whose program and data buses are separated, allowing instruction fetch and data access in a single clock cycle. Within the broader taxonomy, PIC18F devices sit above baseline PIC10/12/16 parts in compute and peripheral capability, while remaining below 16-bit PIC24/dsPIC and 32-bit PIC32 families. This hierarchy makes PIC18F K-series parts well-suited for cost-sensitive applications that need richer peripherals than PIC16 but do not justify the cost of a 32-bit core. Key differentiators include nanoWatt power management with multiple low-power modes (Idle, Sleep, and Deep Sleep with RTCC), an internal 16 MHz oscillator with PLL for 64 MHz operation, and an enhanced instruction set with C-compiler-friendly addressing. The 44-pin QFN footprint with EPAD supports compact layouts while exposing a thermal pad that helps dissipate heat under sustained peripheral load. These features make the part popular in industrial control, sensor-conditioning, low-power wireless hubs, and small USB peripherals. Typical applications include portable instrumentation, sensor data acquisition front-ends, battery-powered HVAC controls, USB HID devices, and industrial automation modules. The combination of 8 KB flash, 36 I/O lines, and 14 ADC channels fits designs that need modest firmware size and multi-channel analog sensing without crossing into 16-bit territory. Engineers often select this part when migrating from PIC16F designs that have outgrown program memory and ADC channel count. When designing with this MCU, ensure that decoupling capacitors (typically 100 nF and 10 uF) are placed close to VDD/VDDCORE pins and that the exposed pad (EPAD) is soldered to a continuous ground plane for both electrical and thermal performance. Program the configuration bits carefully for the chosen oscillator mode and brown-out voltage; failure to set the correct config bits is a common cause of debug-time non-startup issues on PIC18F designs. This page synthesizes distributor pricing, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet, supporting engineers evaluating the PIC18F43K20-E/ML for new designs or as a replacement candidate.

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PIC18F43K20-E/MV - 8KB Flash 8-bit MCU, UQFN-40 | Microchip
PIC18F43K20-E/MV

PIC18F43K20-E/MV - 8KB Flash 8-bit MCU, UQFN-40 | Microchip

The Microchip Technology PIC18F43K20-E/MV is an 8-bit PIC18 microcontroller featuring 8KB Flash program memory, 768 bytes RAM, and a 48 MHz maximum CPU speed, packaged in a 40-pin UQFN (MV) with an exposed pad for thermal performance. Operating from 1.8V to 3.6V, the -E/MV suffix denotes the extended temperature grade (-40C to +125C) suited for industrial and automotive-style applications. The device integrates nanoWatt XLP technology for sub-microamp sleep currents, ideal for battery-powered and energy-harvesting designs. An 8-bit PIC microcontroller (MCU) is a single-chip computer that combines a CPU, non-volatile Flash memory, volatile RAM, and programmable peripherals into one IC. PIC18 devices use an enhanced RISC Harvard architecture with 16-bit instructions and 8-bit data path, sitting in the PIC family hierarchy of PIC10/PIC12/PIC16/PIC18/PIC24/dsPIC and the broader 8-bit microcontroller category. As a member of the power-management IC ecosystem, the PIC18F43K20 provides the computing and control core for embedded designs, with XLP variants specifically tuned for ultra-low-power standby operation where quiescent current dominates battery life. Key features include 8KB (4K x 16) self-programmable Flash, 768 bytes SRAM, 256 bytes EEPROM, a 10-bit ADC with up to 14 channels, two analog comparators, enhanced CCP, two USART, MSSP (SPI/I2C), and a 16-bit timer with nanoWatt XLP power management. The MV package is a UQFN-40 (6x6 mm) with exposed thermal pad, offering a compact footprint for space-constrained PCB layouts. The architecture relies on a modified Harvard bus with separate program and data paths, 31-level stack, hardware multiplier, and C-friendly instruction set that allows efficient code generation while maintaining predictable timing. The integrated 10-bit ADC and analog comparators make the part suitable for mixed-signal sensor interfaces without external components. Typical applications include low-power sensor nodes, battery-powered instrumentation, industrial control modules, automotive body electronics, consumer peripherals, and USB/HID-capable designs (the family supports USB via peripheral derivatives). The wide temperature range also supports outdoor or industrial enclosures. When designing with this device, ensure the UQFN exposed pad is soldered to a sufficiently large copper pour to meet thermal dissipation and to satisfy the package's electrical ground requirement. Decoupling capacitors must be placed within 3 mm of each power pin for reliable ADC and oscillator operation. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC18F43K20-E/P - 8KB Flash 8-bit MCU 48MHz 40-PDIP | Microchip
PIC18F43K20-E/P

PIC18F43K20-E/P - 8KB Flash 8-bit MCU 48MHz 40-PDIP | Microchip

The Microchip Technology PIC18F43K20-E/P is an 8-bit PIC18 microcontroller featuring 8KB (4K x 16) of Flash program memory, a 48MHz internal oscillator, and nanoWatt XLP (eXtreme Low Power) technology, housed in a 40-pin PDIP (Plastic DIP) through-hole package. The -E suffix designates the extended industrial temperature grade (-40C to +125C), while the /P suffix identifies the 40-pin PDIP form factor. Core features include 8-bit modified Harvard architecture, 49 instruction set, 16-bit wide instructions, 8-bit wide data path, and an instruction cycle time of 83 ns at 48 MHz. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, peripherals, and I/O. The PIC18 family is Microchip's high-performance 8-bit line with a modified RISC architecture, optimized for C-compiler efficiency and widely adopted in consumer, industrial, and automotive body electronics. PIC18 K-series parts specifically add nanoWatt XLP technology for ultra-low sleep currents in battery-powered applications. Key features of the PIC18F43K20 include 10-bit A/D converter with up to 14 channels, multiple communication peripherals (EUSART, MSSP for SPI/I2C), PWM modules, comparators, and configurable logic cells. The device operates from 1.8V to 3.6V and includes self-programming Flash with block erase support, making firmware updates practical in the field. The 48 MHz instruction rate delivers up to 12 MIPS throughput. Typical applications include industrial control panels, sensor signal conditioning, low-power remote monitoring, USB-to-UART bridges (with companion parts), and legacy drop-in upgrades for earlier PIC18 designs. The extended temperature range supports under-hood automotive body controllers, outdoor metering, and HVAC peripherals. When designing with this part, plan for decoupling with 100 nF ceramic capacitors on each VDD/VSS pair within 5 mm of the pins, follow Microchip's MPLAB ICD programming pinout, and use the ICD3 or PICkit 4 for in-circuit debugging. The 40-pin PDIP footprint remains the most user-friendly package for prototype work and breadboard integration.

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PIC18F43K20-E/PT - 8KB Flash 8-bit MCU 44-TQFP | Microchip
PIC18F43K20-E/PT

PIC18F43K20-E/PT - 8KB Flash 8-bit MCU 44-TQFP | Microchip

The Microchip Technology PIC18F43K20-E/PT is an 8-bit PIC microcontroller built on Microchip's nanoWatt XLP technology platform, integrating 8 KB of Flash program memory (4K x 16), 512 bytes of SRAM, and 256 bytes of EEPROM in a 44-pin TQFP surface-mount package. It features a 16-bit instruction word, 36 digital I/O lines, a 10-bit ADC with up to 14 channels, and operates across an extended industrial temperature range of -40C to +125C. An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that combines a CPU, non-volatile program memory (Flash), volatile data memory (SRAM), peripheral set, and I/O on a single silicon die. The PIC18F family sits within Microchip's 8-bit PIC architecture hierarchy (PIC10 -> PIC12 -> PIC16 -> PIC18) and is widely used in low-power, deterministic embedded control applications where simple firmware and rich peripheral integration outweigh raw CPU throughput. Within the broader semiconductor taxonomy, the PIC18F43K20 belongs to the microcontroller -> embedded processor -> semiconductor device family. Key features of the PIC18F43K20-E/PT include 64 MHz maximum clock speed (16 MIPS internal execution), a wide 1.8V to 3.6V operating voltage range, nanoWatt XLP technology with sub-microamp sleep currents, two analog comparators, two 8-bit timers and three 16-bit timers, an EUSART, an MSSP (SPI/I2C), and a 10-bit ADC with up to 14 input channels. The '-E' suffix indicates the extended temperature grade (-40C to +125C) and the '/PT' suffix denotes the 44-pin TQFP package. Internally, the device uses a 16-bit RISC-style modified Harvard architecture with a single accumulator (WREG) and an instruction pipeline, giving it deterministic interrupt latency that is well-suited to real-time control loops. The internal oscillator can be calibrated to ±1% across 8 MHz to 32 MHz, eliminating external crystal cost on cost-sensitive designs. The 10-bit ADC uses a sample-and-hold architecture with a 1.2V bandgap reference. Typical applications include industrial sensor interface boards, HVAC controllers, automotive body modules, battery-powered remote sensors, and consumer white-goods control boards. The combination of nanoWatt XLP sleep currents (as low as 20 nA typical), wide voltage range, and 36 I/O pins makes it well matched to space-constrained, energy-harvesting, or always-on designs. Designers typically pick this part when they need more I/O and peripheral than PIC16F parts can deliver but do not require the 16-bit DSP or ARM-class throughput of dsPIC33/PIC32 families. For new designs prefer the PIC18F43K20-I/PT (industrial grade -40C to +85C) unless extended temperature is explicitly required, since 'E' parts are now mainly used for replacement of legacy designs. Verify in your design that your toolchain (MPLAB X IDE, XC8 compiler) supports the 'E' silicon revision before committing to volume production.

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PIC18F43K20-I/ML - 8-bit PIC XLP MCU 64MHz 8KB Flash QFN-44
PIC18F43K20-I/ML

PIC18F43K20-I/ML - 8-bit PIC XLP MCU 64MHz 8KB Flash QFN-44

The Microchip Technology PIC18F43K20-I/ML is an 8-bit RISC microcontroller belonging to the PIC PIC XLP 18K family, running up to 64 MHz with 8 KB (4K x 16) of Flash program memory and housed in a 44-pin QFN (8x8 mm) package with exposed pad. Key features include 512 bytes of RAM, 256 bytes of EEPROM, 36 digital I/O pins, 14-channel 10-bit ADC, two analog comparators with rail-to-rail inputs, and a 1.2V fixed voltage reference (FVR). The nanoWatt XLP technology delivers ultra-low sleep current, making it ideal for battery-powered designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM/EEPROM), and programmable peripherals on one IC. The PIC18 architecture is an enhanced 8-bit RISC core with a C-compiler-optimized instruction set offering an optional extended instruction set for re-entrant code. MCUs sit between fixed-function logic ICs and full application processors, providing deterministic real-time control for embedded applications including motor control, sensor interfacing, and human-machine interfaces. The XLP nanoWatt tier adds deep-sleep operating modes with currents below 1 uA, suitable for energy-harvesting and IoT endpoints where battery life is critical. Differentiation: 64 MHz operation enables instruction cycles below 62.5 ns, while 16 MIPS throughput supports real-time signal processing. The 10-bit ADC with auto-acquisition can convert during Sleep to minimize CPU wake events. Two rail-to-rail comparators and a programmable 16-level VREF allow direct sensor interfacing without external op-amps. The QFN-44 8x8 mm package with thermal pad delivers low theta-JA for high-I/O-count designs that would otherwise require larger QFP packages. Typical applications include consumer appliances, low-cost medical devices, industrial sensor hubs, remote controls, and battery-powered IoT nodes. The wide 1.8V-3.6V operating range simplifies designs powered by 2x AA alkaline cells or single-cell Li-ion batteries. Design consideration: provide a low-impedance ground return to the QFN thermal pad (EP) and stitch it to the system ground plane with multiple vias to achieve specified thermal performance and reduce ground-loop noise on ADC readings. This page synthesizes distributor pricing, drop-in QFN-44 alternatives, and practical design notes not consolidated elsewhere.

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