Integrated Circuits

PIC18LF4420T-I/ML

PIC18LF4420T-I/ML - 16KB Flash 8-bit MCU 44-QFN | Microchip

The Microchip PIC18LF4420T-I/ML is an 8-bit RISC microcontroller from the PIC18F family, offering 16 KB of Flash program memory, 768 bytes of SRAM, and 256 bytes of EEPROM, housed in a 44-pin QFN (ML) package with tape-and-reel packaging. It executes instructions at up to 10 MIPS through a 40 MHz oscillator, integrates a 10-bit ADC with up to 13 channels, and operates from 2.0 V to 5.5 V across industrial temperature ranges. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and programmable peripherals. The PIC18LF architecture uses an enhanced 8-bit Harvard RISC core with a 16-bit instruction word, placing it within the broader hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The LF prefix designates the low-voltage variant, allowing battery-powered and 3.3 V designs without efficiency loss compared to the 5 V-only F-series. Key features include nanoWatt Technology for dynamic power management with multiple idle and sleep modes, a 10-bit successive-approximation ADC with automatic acquisition, dual analog comparators, one Enhanced Capture/Compare/PWM (ECCP) module and one CCP module, MSSP (SPI/I2C) and Enhanced USART peripherals, a 16-bit timer/counter plus two 8-bit timers, and a 13-channel 10-bit ADC. The device supports in-circuit serial programming (ICSP) and self-programming. The PIC18LF4420 implements an enhanced Harvard architecture with separate program and data buses, a hardware multiplier, and a priority-level interrupt controller supporting both vectored and polled interrupt models. nanoWatt Technology provides INTOSC, INTOSCIO, and secondary oscillator modes for low-power operation. Typical applications include industrial control panels, low-power sensor nodes, HVAC thermostats, portable instrumentation, and battery-powered metering devices where the LF voltage range and QFN footprint enable compact PCB layouts. The 36 I/O pins provide flexible peripheral mapping for mixed analog and digital interfaces. When designing with this device, ensure the QFN thermal pad is soldered to a sufficient copper pour for heat dissipation, place decoupling capacitors within 5 mm of each power pin, and configure the configuration bits correctly for the chosen oscillator mode. This page synthesizes drop-in alternatives, comparison data, and practical design notes compiled from Microchip datasheets and distributor inventories.

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PIC18LF4423-I/PT

PIC18LF4423-I/PT - 8-Bit 40MHz 16KB Flash MCU | Microchip

The Microchip Technology PIC18LF4423-I/PT is an 8-bit PIC18 family CMOS flash-based microcontroller running up to 40 MHz (10 MIPS), integrating 16 KB (8K x 16) of program Flash and 768 bytes of SRAM in a 44-pin TQFP (PT) package. The LF suffix denotes the wide 2.0-5.5V operating range optimized for low-voltage F-series designs. What is a PIC18 microcontroller? PIC18 microcontrollers are 8-bit RISC MCUs built on Microchip's enhanced Harvard architecture, supporting up to 16 MIPS throughput with a 16-bit instruction word and 8-bit data path. They occupy the mid-tier of the PIC family hierarchy: PIC microcontroller -> 8-bit MCU -> enhanced RISC core -> PIC18 sub-family -> peripheral-rich variants with ADC, PWM, and communication peripherals. Key features include 36 digital I/O pins, a 10-bit A/D converter with up to 13 channels, multiple serial interfaces (EUSART, MSSP for SPI/I2C), Capture/Compare/PWM modules, and nanoWatt Technology for power-managed sleep modes. The 40 MHz Fosc yields 100 ns instruction cycle with 4x PLL options, supporting demanding real-time control tasks. The device uses Harvard bus architecture with separate program Flash and data SRAM paths, plus internal 32 kHz oscillator and PLL for flexible clocking. On-board self-programmability via ICSP enables field firmware upgrades, while the enhanced instruction set adds hardware multiply and direct register operations, simplifying C compiler code generation for portable firmware. Typical applications include industrial control panels, HVAC sensor interfaces, low-power consumer appliances, USB/HID peripherals, and battery-powered instrumentation. Its low-voltage LF operation makes it suitable for 2-3 AA cell designs or 3.3V system rails where standard PIC18F parts would otherwise be incompatible. Key design consideration: the wide 2.0-5.5V supply range provides flexibility, but designers must respect Vdd minimums during A/D conversions (typically 3.0V for specified 10-bit accuracy); configure ADC acquisition time accordingly. This page consolidates distributor stock data, parametric drop-in alternatives, and engineering design notes drawn from Microchip documentation to help embedded engineers select and qualify the PIC18LF4423 quickly.

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PIC18LF4423T-I/ML

PIC18LF4423T-I/ML - 8-bit 40MHz 16KB Flash MCU | Microchip

The Microchip Technology PIC18LF4423T-I/ML is an 8-bit PIC18 family RISC microcontroller delivering 16 KB of Flash program memory and 768 bytes of SRAM, housed in a 44-pin QFN package with exposed pad (ML suffix). Operating from 2.5 V / 3.3 V / 5 V supplies, the device runs at up to 40 MHz and integrates 34 I/O pins, a 10-bit ADC, nanoWatt power-management technology, and an enhanced FLASH memory architecture. The "LF" prefix denotes the wide-voltage F-grade core designed for low-power applications. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. The PIC18 family is Microchip's enhanced 8-bit architecture, sitting between the baseline PIC10/12/16 families and the 16-bit PIC24/dsPIC line in Microchip's taxonomy (8-bit MCU -> PIC18 -> enhanced FLASH microcontroller -> semiconductor). The LF sub-family specifically targets battery-powered and energy-conscious designs with extended low-voltage operation. Key features include 16 KB (8K x 16) Flash, 768 bytes SRAM, 256 bytes EEPROM, 10-bit A/D converter with up to 13 input channels, 2 capture/compare/PWM modules, a USART, MSSP (SPI/I2C), 2 analog comparators, and nanoWatt technology that drops supply current below 1 microampere in sleep mode. The 44-pin QFN package has an exposed thermal pad for improved heat dissipation. The PIC18LF4423 architecture uses a Harvard design with separate program and data buses, an 8-bit ALU with hardware multiply support, and a 16-bit instruction word. The wide supply range (2.0 V to 5.5 V for the LF core, with the part characterized at 2.5 V / 3.3 V / 5 V) makes it suitable for both 3.3 V and 5 V systems. The nanoWatt power-management features include multiple idle modes, peripheral disable controls, and a real-time clock calibration circuit. Typical applications include industrial control panels, low-power sensor nodes, home appliances, automotive body electronics, HVAC controls, and USB/HID human-interface devices. The wide operating voltage makes the part especially attractive for battery-backed or unregulated-supply designs where the source voltage varies with load. When designing with this part, ensure the QFN exposed pad is soldered to the ground plane to meet thermal specifications. The device operates from -40 C to +85 C in the Industrial temperature range and supports in-circuit serial programming (ICSP) via two pins, enabling firmware updates in the field without removing the MCU. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes drawn from the manufacturer datasheet and authorized distributor listings - information not aggregated in any single manufacturer or distributor source.

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PIC18LF4423T-I/PT

PIC18LF4423T-I/PT - 8-bit MCU, 16KB Flash, 40MHz, TQFP-44

The Microchip Technology PIC18LF4423T-I/PT is an 8-bit RISC PIC microcontroller featuring 16KB of Flash program memory, 768 bytes of RAM, and 256 bytes of EEPROM, housed in a 44-pin TQFP (10x10 mm) package. It operates up to 40 MHz delivering up to 16 MIPS, with a wide supply voltage range of 2.0V to 5.5V and 34 digital I/O lines, plus a 10-bit ADC and nanoWatt power management for low-power designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces. Within the broader taxonomy of embedded semiconductors, the PIC18 family sits above generic 8-bit MCUs and below 16/32-bit MCUs such as dsPIC and ARM Cortex-M parts. The 'LF' prefix in PIC18LF4423 denotes a wide-voltage, low-power variant of the F-series core, while 'nanoWatt' refers to Microchip's suite of power-saving modes including Sleep, Idle, and ultra-low-power ADC operation. The PIC18LF4423T-I/PT integrates a 10-bit A/D converter with up to 13 input channels, capture/compare/PWM modules, an Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART), Master I2C and SPI interfaces with Inter-Integrated Circuit bus support, and parallel slave port for external memory expansion. The integrated nanoWatt technology enables deep-sleep currents below typical PIC18 baselines, making it well-suited to battery-powered applications. Industrial-grade temperature range of -40C to +85C is supported via the 'I' designator. Architecturally, the device uses Microchip's RISC core with 77 instructions and a modified Harvard architecture providing separate program and data buses, plus an 8-level hardware stack. The 16KB Flash supports self-programming and In-Circuit Serial Programming (ICSP) via two pins. Internal oscillator options and a 16x8 hardware multiplier round out the engineer's toolset for cost-sensitive 8-bit designs. Typical applications include industrial control sensor interface boards, USB-interface bridges, small LCD display controllers, low-speed motor control drivers, and remote sensor nodes. The 16KB Flash and 10-bit ADC provide enough headroom for PID loops and basic signal conditioning without resorting to a 32-bit MCU. When designing with this part, pay attention to the 5.5V absolute maximum on VDD. Use decoupling capacitors of 0.1uF plus 10uF bulk close to the power pins, and ensure the MCLR reset line has a proper pull-up. For low-power Sleep mode, use the Run/Idle/Stop nanoWatt modes and shut down the ADC to achieve minimum quiescent draw. This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical PCB design notes not consolidated in the manufacturer datasheet, with cross-references back to Microchip's official PIC18LF4423 datasheet.

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PIC18LF442T-I/ML

PIC18LF442T-I/ML - 8-bit MCU, 16KB FLASH, 40MHz, 44-QFN | Microchip

The Microchip Technology PIC18LF442T-I/ML is an 8-bit RISC microcontroller from the PIC18 family featuring 16KB of FLASH program memory (8K x 16 words), 768 bytes of RAM, and 256 bytes of EEPROM data memory, operating at up to 40MHz from a 2.0V to 5.5V supply in a 44-pin QFN (ML) package. What is a PIC18 microcontroller? A PIC18 is an 8-bit microcontroller from Microchip Technology's PICmicro family using a Harvard architecture RISC core with a 16-bit instruction word and 8-bit data path. The PIC18 sits at the upper tier of the 8-bit PIC family, offering enhanced peripherals, C-optimized architecture, and self-programmability. Within the broader taxonomy: PIC18 -> 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. The 'LF' prefix designates the low-voltage, low-power variant supporting 2.0V to 5.5V operation, while 'F' variants typically require 4.2V to 5.5V. Key features include 34 digital I/O pins, 10-bit multi-channel ADC, Capture/Compare/PWM (CCP) modules, two 8-bit and three 16-bit timers, USART, MSSP (SPI/I2C), 256 bytes of EEPROM, and an external oscillator interface up to 40MHz. The integrated nanoWatt technology provides power-managed modes for sleep, idle, and peripheral operation at microamp currents. The device supports In-Circuit Serial Programming (ICSP) and In-Circuit Debugger (ICD). The PIC18LF442 implements a modified Harvard architecture with a 16-bit program bus and an 8-bit data bus, achieving 10 MIPS at 40MHz. The 31-level hardware stack, 32 interrupt vectors, and 75 instructions (83 with extended instruction set) provide efficient C code generation. The 44-QFN (ML) package offers compact PCB integration with an exposed thermal pad for improved thermal dissipation. Typical applications include industrial control, low-power sensor nodes, HVAC thermostat controllers, battery chargers, automotive body electronics (non-safety), home appliances, and USB device interfaces. The wide operating voltage and low-power modes make it well-suited for energy-harvesting designs. When designing with this MCU, ensure the ICSP programming header follows Microchip's 6-pin layout (PGM/RB7, PGC/RB6, VPP/MCLR, VDD, VSS, NC). The 44-QFN package requires careful PCB land pattern design; refer to Microchip package drawings for proper thermal pad soldering. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC18LF4431-I/ML

PIC18LF4431-I/ML - 8-bit 40MHz 16KB Flash MCU | Microchip | 44-QFN

The Microchip Technology PIC18LF4431-I/ML is an 8-bit PIC18F-family microcontroller running at 40 MHz with 16 KB (8K x 16) of enhanced flash program memory and 768 bytes of RAM, packaged in a 44-pin QFN (8x8 mm). The LF prefix designates the low-voltage variant with 2.0-3.6V VDD operation suitable for battery-powered designs, while the 1/ML suffix indicates the industrial temperature grade (-40C to +85C) and QFN surface-mount package. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, RAM, non-volatile program memory, and peripherals. The PIC18F architecture is a RISC-based Harvard design that executes most instructions in a single 200 ns cycle, achieving up to 10 MIPS throughput. Within the broader taxonomy, PIC18F sits between mid-range PIC16 and high-end dsPIC/32-bit MCUs, targeting cost-sensitive embedded control with strong interrupt handling and deterministic timing. Key features include 34 digital I/O pins, 10-bit ADC with up to 9 channels, multiple PWM modules with high-performance motion-feedback support (Power Control PWM), three 16-bit timers and one 8-bit timer, two comparators, an enhanced USART, MSSP (SPI/I2C), and nanoWatt power-management modes for sleep currents below 1 uA. The 44-QFN exposes 34 I/O while keeping board footprint compact at 8x8 mm with an exposed thermal pad for improved dissipation. The PIC18LF4431 uses Microchip's enhanced flash cell with self-programming support and an ICD-friendly debug interface. On-chip peripherals map to motion-control, motor-drive, and power-conversion functions — the device is part of the PIC18F2331/2431/4331/4431 family optimized for high-performance PWM feedback loops, making it a natural fit for BLDC, switched-mode power supply, and UPS control applications. Typical applications include BLDC and PMSM motor control, switch-mode power supply control, UPS and inverter control, industrial sensor conditioning, automotive body electronics, and low-power battery instruments. Designers use the on-chip 10-bit ADC for current/voltage sensing and the dedicated PWM module for driving power switches with programmable dead-band and fault input. When designing with this device, ensure the QFN exposed pad is soldered to a sufficient ground copper pour (typically 1 square inch or more) to meet the 4 W thermal dissipation capability of the package. Decouple VDD with a 100 nF ceramic placed within 5 mm of the IC, plus a bulk 10 uF tantalum or ceramic; the LF core needs a stable 3.3 V rail to avoid LVD-induced resets. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC18LF4431-I/P

PIC18LF4431-I/P - 8-bit PIC18 40MHz 16KB Flash MCU | Microchip

The Microchip Technology PIC18LF4431-I/P is an 8-bit PIC18 family microcontroller with nanoWatt Technology, 16KB of Flash program memory, 768 bytes of RAM, and a 40 MHz maximum CPU clock, housed in a 40-pin PDIP (DIP-40) through-hole package. The part integrates a 10-bit Analog-to-Digital Converter, a high-performance PWM module suitable for motor control, and 34 digital I/O pins, all within an industrial temperature range of -40C to +85C. An 8-bit microcontroller (MCU) is a programmable integrated circuit that uses an 8-bit data path, executes instructions from on-chip Flash memory, and integrates CPU, RAM, non-volatile storage, and peripherals (ADC, PWM, timers, communication) into a single chip. The PIC18LF family sits above PIC16 in Microchip's 8-bit hierarchy and is widely used where deterministic interrupt response, low power, and proven toolchains matter more than raw compute. The 'LF' suffix designates the wide-voltage variant that operates across 2.0V-5.5V, while the 'F' (non-LF) version targets 4.2V-5.5V only. Key features include 16KB (8K x 16) Flash program memory, 768 bytes of data RAM, a 10-bit ADC with multiple channels, an enhanced CCP (Capture/Compare/PWM) module with up to 14-bit resolution for motor control, and nanoWatt Technology power management offering Sleep, Idle, and Run modes. The 40-pin PDIP package is the most legacy-friendly footprint in the PIC18 line and is preferred for prototyping, hobbyist designs, and educational platforms. The PIC18LF4431-I/P uses Microchip's enhanced Harvard RISC architecture with 16-bit instructions, 8-bit data, and a hardware multiplier, executing up to 10 MIPS at 40 MHz. Code is fetched from Flash through a 16-bit program bus while data moves on an 8-bit bus, which together enable single-cycle instruction execution and predictable timing for interrupt-driven firmware. Typical applications include three-phase induction motor control (BLDC, PMSM), HVAC fan and pump control, industrial automation, SMPS digital control loops, automotive body electronics (via the automotive-grade PIC18F4431-I/P sibling), and educational/development boards. The integrated high-resolution PWM and ADC are tuned specifically for closed-loop motor control firmware. When designing with this MCU, remember that 'LF' denotes the wide-voltage variant - do not swap it for the non-LF PIC18F4431 in 3.3V-only designs. Programming is done via ICSP through PGC/PGD pins, and MPLAB X IDE plus MPLAB XC8 are the supported toolchains. ESD-sensitive pins (especially analog inputs) require series resistors and clamping. This page synthesizes distributor pricing, drop-in alternative MPNs from the same PIC18 family, and practical design notes not consolidated in the manufacturer datasheet alone.

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PIC18LF4431-I/PT

PIC18LF4431-I/PT - 8-bit PIC MCU, 16KB Flash, 40MHz, 44-TQFP | Microchip

The Microchip Technology PIC18LF4431-I/PT is an 8-bit PIC18 enhanced flash microcontroller with nanoWatt technology, integrating 16KB of program flash, 768 bytes of SRAM, a 10-bit ADC, and high-performance PWM peripherals in a 44-pin TQFP package. It features a 40 MHz maximum clock frequency, 34 digital I/O lines, and is engineered for low-power operation across an industrial temperature range of -40C to +85C. The LF prefix denotes the low-voltage variant supporting operation down to 2.0V. A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory, data memory, and peripheral interfaces on a single die, allowing embedded control of sensors, actuators, and communication buses. The PIC18 family belongs to the broader 8-bit RISC microcontroller hierarchy, which itself sits within the wider class of microcontrollers (MCU) -> embedded processors -> semiconductor devices. PIC18 MCUs implement a modified Harvard architecture with a 16-bit instruction word and 8-bit data path, optimized for deterministic interrupt latency and low-power sleep modes. Key features of the PIC18LF4431 include the nanoWatt power-management suite (multiple idle and sleep modes), a 10-bit ADC with up to 9 input channels, a 14-bit High-Speed PWM module suitable for motor control and power conversion, two USART modules for asynchronous and synchronous serial communication, an I2C/SPI peripheral pair, and an enhanced Capture/Compare/PWM (ECCP) module. The device supports in-circuit serial programming (ICSP) and in-circuit debugging (ICD) via Microchip's MPLAB toolchain, enabling rapid firmware iteration. Architecturally, the PIC18LF4431 uses Microchip's enhanced flash cell with a 100K erase/write cycle endurance and a typical data retention of greater than 40 years. The 8-bit data path and 16-bit instruction word deliver up to 10 MIPS at 40 MHz, with most single-word instructions executing in 4 clock cycles. Internal oscillator options and a wide operating voltage range (2.0V to 5.5V) provide design flexibility for battery-powered and industrial 24V-tolerant systems with external regulation. Typical applications include BLDC and brushed DC motor control, switched-mode power supply (SMPS) digital control loops, industrial sensor conditioning, HVAC fan control, LED lighting drivers, and automotive body/comfort subsystems. The 14-bit PWM with 60 ns resolution is especially valuable in digital power and motor-drive applications where fine duty-cycle granularity is required. Designers should note that the 5.5V absolute maximum on VDD requires a brown-out reset (BOR) configuration in firmware and adequate decoupling (100 nF + 10 uF bulk) within 5 mm of the supply pins. Migration between PIC18F and PIC18LF variants is straightforward because they share the same pinout, but the LF variant's lower minimum voltage (2.0V vs 4.2V) must be respected during firmware power-mode selection. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet, giving engineers a single, citable reference for sourcing and substitution decisions.

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PIC18LF4431T-I/ML

PIC18LF4431T-I/ML - 8-bit 40MHz 16KB Flash MCU 44-QFN | Microchip

The Microchip Technology PIC18LF4431T-I/ML is an 8-bit PIC RISC microcontroller operating at up to 40 MHz with 16 KB (8K x 16) of program Flash memory, packaged in a 44-lead QFN (8x8 mm) with exposed pad. It belongs to the PIC18F2331/2431/4331/4431 family and is the low-voltage (LF) variant optimized for 2.5V/3.3V/5V operation. The device integrates 768 bytes of RAM, 256 bytes of EEPROM, and 9 channels of 10-bit analog-to-digital conversion. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), and a rich set of peripherals such as ADCs, timers, communication interfaces, and GPIO. The PIC18LF4431 belongs to the 8-bit PIC RISC family, sitting within the broader hierarchy 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. Its modified Harvard architecture and 16-bit instruction word provide higher code density than many 8-bit peers, while the LF process node enables lower active and sleep current draw for battery-powered designs. Key features include an enhanced Flash program memory rated for typical 100K erase/write cycles, 10 MIPS sustained throughput at 40 MHz, multiple serial interfaces (I2C, SPI, UART/USART), a 10-bit ADC with up to 9 channels, and power-managed modes with fast wake-up. The 'T' suffix indicates Tape & Reel packaging and the 'I' suffix designates the industrial temperature grade of -40C to +85C, suitable for harsh environments. Typical applications include motor control (the 4331/4431 sub-family is specifically designed for closed-loop brushless DC and switched-reluctance motor drives), sensor conditioning, industrial automation, white goods, and general-purpose embedded control where low-power, low-voltage operation and a compact QFN footprint are required. When designing with this part, allocate sufficient PCB copper area beneath the exposed pad (EP) of the QFN-44 to meet thermal dissipation requirements and improve electrical grounding. Decouple VDD with at least 100 nF and 10 uF capacitors placed within 5 mm of the supply pins. The LF process limits maximum VDD to roughly 5.5 V, so verify rail tolerance if migrating from the F variant. This page synthesizes distributor pricing, drop-in 44-QFN alternatives, parametric comparison, and practical QFN PCB layout guidance that go beyond the raw manufacturer datasheet, helping engineers accelerate motor-control and general-purpose 8-bit designs.

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PIC18LF4439-I/ML

PIC18LF4439-I/ML - 8-bit 40MHz MCU, 12KB Flash, 44-QFN | Microchip

The Microchip Technology PIC18LF4439-I/ML is an 8-bit PIC microcontroller built on an enhanced RISC architecture, operating at up to 40 MHz with 12 KB of FLASH program memory (6K x 16) and 640 bytes of RAM, housed in a 44-pin QFN (8x8 mm) package with an exposed thermal pad. The 'LF' prefix denotes the extended low-voltage family supporting 2.0V-3.3V operation plus 5V-tolerant I/O, making it well suited to mixed-voltage designs and battery-powered applications. The PIC18 microcontroller is an 8-bit Harvard-architecture RISC MCU family originally developed by Microchip. It belongs to the broader PIC (Peripheral Interface Controller) lineage, which sits within the microcontroller (MCU) category of microcontrollers and digital ICs. PIC18 devices combine a relatively high MIPS-per-MHz throughput (typically 1 MIPS/MHz) with rich peripheral integration including ADC, PWM, ECAN, and motor-control PWM, which is why they remain popular for embedded control rather than high-throughput digital signal processing. Key features of the PIC18LF4439 include the dedicated motor-control peripherals that distinguish this family: a 14-bit Enhanced PWM module with up to 8 outputs, a 200 ksps 10-bit ADC, and quadrature encoder interfaces. The exposed pad on the 44-QFN package drops the thermal resistance below that of equivalent QFP packages and enables higher continuous dissipation, which matters when driving power stages such as three-phase motor bridges. Architecturally, the device uses a 16-bit instruction word FLASH program memory with an 8-bit data path, plus a hardware multiply and a 31-level-deep hardware stack. Its wide operating voltage range (2.0V to 5.5V) and dual oscillator support (HS, XT, RC, internal 8 MHz) make it flexible for both line-powered and portable motor-control designs. Typical applications include BLDC/PMSM motor drives in industrial fans and pumps, HVAC blowers, sensorless fan controllers on 24V rails, robotic servo boards, and low-voltage UPS modules. Automotive variants exist in the same family for body-control and small-motor applications. Key design consideration: place the 0.1 µF VDD decoupling capacitor within 5 mm of the power pin and stitch the exposed pad to a contiguous ground plane to keep the silicon cool during sustained PWM switching. This page synthesises verified distributor pricing, drop-in package-compatible alternates, and practical thermal/pinout guidance not found in the manufacturer datasheet alone.

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PIC18LF4439-I/P

PIC18LF4439-I/P - 8-Bit 40MHz MCU 12KB Flash 40-PDIP | Microchip

The Microchip Technology PIC18LF4439-I/P is an 8-bit RISC microcontroller belonging to the PIC18F family, featuring 12KB (6K x 16) of FLASH program memory, 640 bytes of RAM, and 32 I/O pins, all housed in a 40-pin PDIP (DIP) through-hole package. It integrates a 40 MHz CPU core with an enhanced 16-bit instruction set and is designed for industrial temperature operation (-40C to +85C), making it suitable for harsh embedded environments. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripherals on a single die. The PIC18F family uses a Harvard-architecture RISC core with a 16-bit instruction word and 8-bit data path, sitting in the broader semiconductor hierarchy of microcontroller -> embedded processor -> semiconductor device. The 'LF' prefix designates low-voltage operation (typically 2.0V-3.6V), enabling battery-powered and portable designs where standard 5V PIC18F parts would be unsuitable. Key features include a 10-bit ADC with up to 8 channels, multiple PWM outputs suitable for motor control, a USART, MSSP (SPI/I2C), capture/compare/PWM modules, and dual analog comparators. The PIC18LF4439 also includes special motor-control peripherals, notably the Power Control PWM module and quadrature encoder interface, distinguishing it within the PIC18F lineup for motion-control applications. The architecture uses a Harvard-memory RISC core with hardware multiplier and 32-level stack, achieving up to 10 MIPS throughput at 40 MHz. The integrated motor-control PWM block delivers up to 14-bit resolution with center-aligned or edge-aligned modes, supporting complementary outputs with programmable dead-time insertion - a feature targeted at three-phase inverter designs. The 10-bit ADC with dual Sample-and-Hold enables simultaneous voltage and current sensing in FOC (field-oriented control) loops. Typical applications include BLDC motor control (single/three-phase), industrial drives, HVAC fan/blower controllers, home automation, low-power sensor platforms, and battery-powered instrumentation where the wide 2.0V-3.6V operating range is critical. When designing with this device, ensure proper decoupling (100 nF + 10 uF near VDD/AVDD pins) and that the MCLR pin is tied through a pull-up resistor with the standard ICSP layout for in-circuit serial programming retention. This page synthesizes distributor pricing, drop-in alternatives, parametric comparisons, and practical design notes for the PIC18LF4439-I/P that are not collated in the manufacturer datasheet alone.

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PIC18LF4439-I/PT

PIC18LF4439-I/PT - 8-bit MCU, 12KB Flash, 40MHz | Microchip

The Microchip PIC18LF4439-I/PT is an 8-bit PIC18F-family microcontroller (MCU) with 12KB of Flash program memory, 640 bytes of RAM, and a 40 MHz maximum core clock speed, housed in a 44-pin TQFP (PT) package rated for the industrial -40C to +85C temperature range. The LF prefix indicates the wide-voltage (2.0V to 5.5V) variant suitable for battery and low-power embedded designs, while the integrated 10-bit ADC with eight input channels and three serial interfaces (I2C, SPI, USART) provide flexible analog and digital connectivity. The PIC18 is an 8-bit RISC microcontroller family manufactured by Microchip Technology. Built on an enhanced Harvard architecture with separate program and data buses, the PIC18 family delivers up to 10 MIPS performance at 40 MHz, executes a 16-bit instruction word from Flash memory, and offers an instruction set optimised for C compiler code density. Within the broader semiconductor hierarchy, an MCU belongs to the embedded processor category and is distinct from a microprocessor in that peripherals, memory and interrupt controllers are integrated on-chip, reducing BOM cost and PCB area in volume designs. Key features include the in-system programmable Flash (12KB / 6K x 16 words) accessed via ICSP, a 10-bit successive-approximation ADC with eight input channels, three independent serial peripherals (I2C, SPI, USART), one 8-bit and three 16-bit timers, and up to 32 digital I/O pins. The PWM module is enhanced for motor-control and power-conversion applications, while the Capture/Compare/PWM peripherals support input measurement and waveform generation. Architecturally, the PIC18LF4439-I/PT uses an enhanced 16-bit instruction set with hardware multiply, eight-level deep hardware stack, and a vectored interrupt controller with multiple priority levels. The wide 2.0V to 5.5V supply range allows operation from single-cell Li-ion, two-cell alkaline, or regulated 3.3V/5V rails. Internal oscillator modes and a Phase-Locked Loop (PLL) reduce external component count, while the nanoWatt power-managed modes support sleep currents down to nanoampere levels. Typical applications include industrial motor control, sensor signal conditioning, appliance controls, HVAC fan controllers, lighting ballasts, automotive body electronics (non-safety), medical instrumentation, and consumer white goods. The wide operating voltage makes it suitable for battery-powered portable devices, while the PWM and capture modules support closed-loop control of brushless DC motors and switched-mode power converters. When designing with this MCU, allow for the decoupling capacitor network and a minimum ICSP header footprint if in-field firmware updates are required. Ensure the trace lengths between the crystal or external clock source and the OSC pins are short and guarded to preserve signal integrity and minimise EMI. The internal RC oscillator is sufficient for non-timing-critical tasks but should be replaced with a crystal when UART or PWM accuracy is required. This page synthesizes distributor pricing, pin-compatible alternatives drawn from the same Microchip PIC18 family, and practical design notes - information not found in the standalone manufacturer datasheet and curated specifically for engineers sourcing PIC18LF4439-I/PT for new designs or service replacements.

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PIC18LF4439T-I/ML

PIC18LF4439T-I/ML - 8-bit MCU, 12KB Flash, 40MHz, 44-QFN | Microchip

The Microchip PIC18LF4439T-I/ML is an 8-bit RISC microcontroller belonging to the PIC18F family, featuring 12KB (6K x 16) of Flash program memory, 640 bytes of RAM, and 256 bytes of EEPROM, operating at up to 40 MHz from a 2.0V to 5.5V supply in a 44-pin QFN (8x8 mm) package. Tape-and-reel packaged for high-volume manufacturing, it provides 36 digital I/O pins, a 10-bit Analog-to-Digital Converter with up to 8 channels, multiple PWM modules, and Microchip's nanoWatt Technology for dynamic power management. The "LF" suffix indicates the low-voltage variant designed for 2.0V-5.5V operation, while the "F" core delivers the enhanced instruction set and C-friendly architecture of the PIC18 family. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, peripherals, and I/O on one die. The PIC18F family sits between Microchip's baseline PIC16 and the 16-bit dsPIC families, targeting applications that need more code space, more peripherals, and deterministic interrupt handling than an 8-bit baseline MCU but where cost and power must remain low. Within the power IC taxonomy, an MCU is a digital logic IC; within the broader semiconductor hierarchy it is part of the embedded computing category. Key features of the PIC18LF4439T-I/ML include a 40 MHz internal/external clock, hardware Multiply instruction, 16-bit wide instructions with an 8-bit data path, and 31-level hardware stack. The device integrates two CCP modules, one Enhanced CCP (ECCP) module for advanced PWM and full-bridge motor control, a USART with LIN support, an MSSP for SPI/I2C, and a 10-bit ADC with up to 8 channels. The nanoWatt Technology provides multiple idle/sleep modes that drop quiescent current below 1 microampere in deep sleep, enabling battery-friendly designs. The LF silicon process is optimized for low-voltage operation down to 2.0V, making the LF4439 suitable for 2x AA battery cells or single Li-ion applications with a 3.3V regulator. The 44-pin QFN (ML) package offers a compact 8x8 mm footprint with an exposed thermal pad for improved heat dissipation during sustained 40 MHz operation. Programming and in-circuit debugging are supported through Microchip's ICSP (In-Circuit Serial Programming) interface and the MPLAB ICD debugger family. Typical applications for the PIC18LF4439T-I/ML include motor control (BLDC, brushed DC, stepper) thanks to the ECCP full-bridge PWM, white goods and appliance control panels, low-power sensor nodes, USB-to-UART bridges where the USART is paired with an external USB transceiver, and industrial control requiring 5V-tolerant I/O. The part is particularly well suited to designs migrating from PIC16 to PIC18 without changing the supply voltage rail. When designing with this part, ensure the QFN exposed pad is soldered to a sufficient copper area (typically 1 square inch) for thermal dissipation. Decoupling must include a 100 nF ceramic on each power pin within 2 mm of the package, and a bulk 4.7-10 uF tantalum or ceramic on the main VDD rail. The configuration bits should be reviewed carefully to set the oscillator mode, watchdog state, and code protection before programming. This page consolidates distributor pricing, drop-in pin-compatible alternatives from Microchip's PIC18 family, and practical design notes that go beyond what the manufacturer datasheet alone provides.

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PIC18LF4439T-I/PT

PIC18LF4439T-I/PT - 8-bit MCU, 12KB Flash, 44-TQFP | Microchip

The Microchip Technology PIC18LF4439T-I/PT is an 8-bit PIC microcontroller featuring 12KB of Flash program memory, 640 bytes of RAM, and 32 digital I/O pins, packaged in a 44-lead TQFP (Tape and Reel, Industrial temperature grade). It belongs to the PIC18F family of enhanced Flash microcontrollers and operates from a low-voltage supply range suitable for battery-powered and portable designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, Flash program memory, peripherals, and I/O onto one die. The PIC18F architecture (Harvard, RISC) executes one instruction per clock cycle (except branches) and is widely used for embedded control in industrial, consumer, and automotive applications. Within Microchip's hierarchy, the PIC18F family sits between baseline PIC10/12/16 parts and the 16-bit dsPIC/PIC24 families. Key features of the PIC18LF4439T-I/PT include enhanced Flash memory supporting self-programmability, an industrial operating temperature range of -40C to +85C, and a 44-pin TQFP surface-mount footprint. The part suffix -LF denotes the low-voltage (LF) process variant optimized for operation at reduced VDD, while the T indicates Tape and Reel packaging and I denotes the industrial temperature grade. Typical applications include motor control (the PIC18F4439 family integrates dedicated motor-control peripherals such as PWM and quadrature encoder interfaces), sensor interfacing, low-power industrial controllers, and consumer appliance control. The combination of 12KB Flash, 640 bytes RAM, and 32 I/O is well-suited to small control loops where deterministic timing and modest code size matter more than raw CPU throughput. When designing with this part, verify the supply voltage range against your application: the LF process variant typically operates down to ~2.0 V, while the standard F variant operates 4.2-5.5 V. Engineers should consult the PIC18F4331/4431 datasheet family, which shares the same peripheral set, for detailed electrical characteristics and timer configuration. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers and procurement teams select and source the PIC18LF4439T-I/PT with full context.

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PIC18LF4450-I/ML

PIC18LF4450-I/ML - 48MHz 8-bit USB MCU, 16KB Flash, 44-QFN | Microchip

The Microchip PIC18LF4450-I/ML is an 8-bit PIC18 microcontroller with integrated Full-Speed USB 2.0 (12 Mbit/s), 16 KB (8K x 16) of Flash program memory and 768 bytes of SRAM, housed in a 44-pin QFN (8x8 mm) package with exposed thermal pad. It operates from a wide 2.0 V to 5.5 V supply range, runs at up to 48 MHz (12 MIPS) and is rated for the industrial -40C to +85C temperature window. The LF suffix denotes the low-voltage / low-power variant of the PIC18F4450 family. An 8-bit microcontroller (MCU) is a self-contained compute subsystem on a single silicon die, integrating a CPU core, non-volatile program memory (Flash), volatile data memory (SRAM), digital peripherals (timers, UART, I2C, SPI, USB) and general-purpose I/O. The PIC18 family is the high-performance tier of Microchip's 8-bit MCU line, sitting above PIC10/12/16 in peripheral richness and instruction throughput. The LF sub-family trades absolute speed headroom for wider operating-voltage range and nanoWatt sleep modes, making it a fit for battery- and bus-powered edge devices. Key features include 10-bit ADC with up to 13 input channels, three counter/timers, a Capture/Compare/PWM module, an Enhanced USART (EUSART, LIN-capable), Master I2C and SPI (up to 10 Mbit/s), the Full-Speed USB 2.0 transceiver with on-chip SIE, and Microchip's nanoWatt power-management block with Idle, Sleep and deep-sleep modes. The 44-QFN (ML) package exposes 34 general-purpose I/O lines plus dedicated USB D+/D- pads, VUSB and the internal 3.3V USB regulator. Architecturally the PIC18LF4450 implements an enhanced Harvard RISC core with 16-bit instructions, a hardware multiplier (8x8 single-cycle) and a 31-level deep stack. The integrated USB SIE handles packet framing, CRC and the physical-layer signaling so the CPU is freed from bit-banging, dramatically lowering firmware complexity for HID, CDC and vendor-class USB applications. Typical applications include USB HID peripherals (keyboards, mice, custom joysticks), USB-to-UART bridges, low-power sensor nodes with USB charging, industrial data loggers, LIN slave nodes in automotive body controllers, and educational/development boards. The wide 2.0-5.5 V range lets the device run directly from a single Li-ion cell, two AA cells, or a 3.3 V regulated rail. When designing with this part, observe the PCB layout rules in Microchip AN233 (USB PCB layout) - the D+/D- traces must be 90 ohm differential, matched-length, and the VUSB decoupling capacitor must be within 5 mm of the VUSB pin. For self-powered designs, the internal 3.3 V USB regulator can be disabled via CONFIG and an external rail supplied to the VUSB pin. This page synthesizes current distributor pricing, drop-in same-package alternatives, and practical layout notes that go beyond the datasheet to speed USB-MCU bring-up.

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PIC18LF4450T-I/ML

PIC18LF4450T-I/ML - 16KB Flash USB MCU 48MHz QFN-44 | Microchip

The Microchip Technology PIC18LF4450T-I/ML is an 8-bit RISC microcontroller featuring 16KB of enhanced Flash program memory, 768 bytes of RAM, and an integrated Full-Speed USB 2.0 transceiver, housed in a 44-pin QFN package (8x8 mm) with exposed thermal pad. It delivers 12 MIPS performance at 48 MHz clock speed and operates from 2.0V to 5.5V supply. A USB microcontroller is a specialized MCU that integrates a USB transceiver and serial interface engine (SIE) directly on-chip, eliminating the need for an external USB PHY. It belongs to the broader category of embedded controllers within the microcontroller -> 8-bit MCU -> PIC18 family -> USB-capable MCU hierarchy. The 'LF' prefix denotes a low-voltage variant optimized for battery-powered and low-power applications using Microchip's nanoWatt technology, while the 'F' architecture provides enhanced Flash with self-programming capability. Key features include 34 digital I/O pins, 13-channel 10-bit ADC, two analog comparators, two CCP modules, one enhanced USART, MSSP (SPI/I2C), and hardware multiply. The device supports ICSP (In-Circuit Serial Programming) and ICD (In-Circuit Debugger) for development workflows. nanoWatt power management provides multiple idle and sleep modes with current consumption under 1 microamp in sleep, suitable for USB bus-powered and battery applications. The integrated USB 2.0 Full-Speed transceiver supports low-speed (1.5 Mbps) and full-speed (12 Mbps) operation with on-chip SIE handling protocol, leaving the CPU free for application code. Typical applications include USB peripherals (HID-class devices, CDC virtual COM ports, mass storage), industrial control interfaces with USB diagnostics ports, USB-to-UART bridges, embedded data loggers with USB download, and battery-powered handheld instruments. The wide 2.0-5.5V supply range also supports both 3.3V and 5V system designs without level translation. When designing with this device, ensure the USB D+/D- traces are routed as a 90-ohm differential pair with characteristic impedance controlled to USB 2.0 specification. The internal 3.3V USB voltage regulator requires adequate decoupling (220 nF plus 100 uF bulk) per the datasheet reference design. The exposed thermal pad (EP) must be soldered to a ground plane for electrical and thermal performance. This page synthesizes distributor pricing, drop-in alternatives from the Microchip PIC18 family, and practical design notes not found in the manufacturer datasheet alone.

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PIC18LF4450T-I/PT

PIC18LF4450T-I/PT - 8-Bit 48MHz USB MCU, 16KB Flash, TQFP-44 | Microchip

The Microchip Technology PIC18LF4450T-I/PT is an 8-bit RISC PIC18F-family microcontroller integrating a Full-Speed USB 2.0 transceiver, 16KB of enhanced Flash program memory (organized as 8K × 16), and 768 bytes of RAM, all housed in a 44-pin TQFP (10 × 10 mm) package. It executes instructions at up to 48 MHz (12 MIPS) and operates from a 2.0 V to 5.5 V supply, making it compatible with both 3.3 V and 5 V rails common in mixed-signal designs. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data-path CPU, on-chip program memory (ROM/Flash), data RAM, and a mix of peripherals such as timers, ADC, communication interfaces, and I/O pins. Within the broader taxonomy, the PIC18LF4450 belongs to the PIC18F high-performance flash family, which sits between baseline PIC10/12/16 parts and 16-bit PIC24/dsPIC devices, and is part of Microchip's microcontroller -> MCU -> embedded controller -> semiconductor hierarchy. The 'LF' prefix designates the low-voltage / low-power variant of the PIC18F4550. Key features include 34 digital I/O pins, integrated Full-Speed USB 2.0 device/host/OTG transceiver with on-chip voltage regulator, 10-bit ADC, Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART), Master Synchronous Serial Port (MSSP) for SPI and I2C, and nanoWatt Technology power management with multiple idle/sleep modes. The Enhanced Flash offers 100K erase/write cycle endurance typical and program retention exceeding 40 years. Architecturally, the PIC18LF4450 uses a 16-bit instruction word (8K × 16 = 16KB) with an 8-bit data path, Harvard architecture, and a hardware multiply unit. The integrated USB SIE handles low-level protocol, freeing the core from bit-banging and enabling CDC, HID, MSD and custom class firmware. The on-chip 3.3 V regulator provides up to 250 mA to external logic when the device is powered from 5 V. Typical applications include USB peripherals (HID mice/keyboards, CDC serial bridges, MSD card readers), industrial control with USB diagnostics, embedded data loggers, and battery-powered sensor nodes. Designers value the part for collapsing a separate USB bridge chip and external LDO into a single MCU footprint. When designing in the PIC18LF4450, ensure the 48 MHz HS oscillator uses the correct crystal and load capacitors, add a 1 µF bulk capacitor at VUSB and VDD, and reserve the D+/D- lines with 90-ohm differential routing. For low-power targets, leverage nanoWatt sleep modes and the on-board low-power Timer1 oscillator to reduce quiescent current below 1 µA. This page synthesizes distributor pricing, parametric comparisons with PIC18F4550 and PIC18F46J50 drop-in alternatives, and practical design notes not collocated in the manufacturer datasheet.

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PIC18LF4455-I/ML

PIC18LF4455-I/ML - 8-bit 48MHz USB MCU 24KB Flash | Microchip

The Microchip Technology PIC18LF4455-I/ML is an 8-bit PIC18 microcontroller running at 48 MHz with 24 KB of Flash program memory (12K x 16 words), 2 KB of RAM, and an integrated Full-Speed USB 2.0 transceiver, packaged in a 44-pin QFN (8x8 mm). It belongs to the PIC18F4550-family LF (low-voltage, 2.0V to 5.5V) variants with 12 MIPS throughput, nanoWatt power management, and 34 digital I/O pins. An 8-bit microcontroller (MCU) is a programmable processor with an 8-bit data path and integrated peripherals, used as the decision-making brain in embedded systems. Within the broader hierarchy, this device sits in the microcontroller category of integrated circuits, evolving upward into the semiconductor and embedded computing domains. PIC18 MCUs use a RISC instruction set with hardware multiplier, distinguishing them from 8051 and AVR cores while sharing the same design philosophy of deterministic real-time control. Key features include 256 bytes of EEPROM, an integrated Full-Speed (12 Mbit/s) USB 2.0 SIE with on-chip transceiver, A/D converter, Capture/Compare/PWM modules, and nanoWatt Technology modes (Idle, Sleep, and Deep Sleep) for battery-powered designs. The 44-QFN package provides a compact footprint with an exposed thermal pad, enabling surface-mount assembly into USB peripheral designs that need a small board area. The architecture combines a 16-bit-wide instruction word with separate program and data buses (Harvard architecture), allowing simultaneous fetch and read cycles that double throughput compared with traditional von-Neumann 8-bit cores. The integrated USB SIE eliminates the need for an external transceiver, reducing both BOM cost and PCB area in HID, CDC, and custom-class USB devices. The LF voltage range (2.0V to 5.5V) makes the chip suitable for direct Li-ion / 3.3V regulation while preserving the USB transceiver's proper signalling levels. Typical applications include USB Human Interface Devices (HID keyboards, mice, game controllers), USB-to-UART bridges (CDC class), industrial data loggers with USB connectivity, low-power sensor hubs, and consumer USB peripherals such as MIDI adapters. The 2 KB RAM supports moderate USB class driver stacks, and 34 I/O pins allow direct connection to buttons, encoders, LEDs, and SPI or I2C peripherals without an external I/O expander. When designing with this part, ensure the VUSB 3.3V internal LDO has a sufficient decoupling capacitor on the dedicated pin, and route the D+/D- differential pair with 90-ohm controlled impedance. For low-power designs, leverage the nanoWatt Sleep states and wake-up sources to maximize battery life in USB-attached devices that draw suspend current. This page synthesizes distributor pricing, parametric alternatives, and USB design notes that complement the Microchip PIC18F4550 datasheet family reference manual.

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PIC18LF4455-I/P

PIC18LF4455-I/P - 8-Bit 48MHz USB MCU 24KB Flash 40-PDIP | Microchip

The Microchip Technology PIC18LF4455-I/P is an 8-bit PIC18F-family microcontroller with integrated Full-Speed USB 2.0, 24 KB of Flash program memory and 2 KB of RAM, operating at up to 48 MHz across a 2.0 V to 5.5 V supply range, housed in a 40-pin PDIP (I/P) through-hole package. According to the PIC18F2455/2550/4455/4550 family datasheet, the LF suffix denotes the extended low-voltage variant, and the I/P suffix indicates the industrial operating temperature grade (-40C to +85C) in PDIP-40. An 8-bit microcontroller (MCU) is a programmable processor that executes instructions on 8-bit-wide data, typically chosen for cost-sensitive, low-power, and deterministic control tasks. The PIC18F family sits in Microchip's mid-range 8-bit portfolio, between the baseline PIC10/12/16 series and the 16-bit dsPIC/PIC24 line, and the PIC18LF4455 specifically targets USB-enabled embedded designs thanks to its on-chip Full-Speed USB 2.0 (12 Mbit/s) peripheral plus three serial ports (I2C, SPI up to 10 Mbit/s, and LIN-capable EUSART). Key features of the PIC18LF4455-I/P include nanoWatt power management with multiple idle/sleep modes, a 10-channel 10-bit ADC, two analog comparators, two 8-bit timers plus three 16-bit timers, a 9-channel Enhanced Capture/Compare/PWM module, and a universal serial bus with on-chip transceiver. The wide 2.0 V to 5.5 V supply range allows direct operation from a single Li-ion cell, two alkaline cells, or a regulated 5 V rail. The industrial -40C to +85C temperature grade suits outdoor, industrial, and automotive-cockpit applications that do not require full AEC-Q100 qualification. Architecture-wise, the device uses an enhanced Harvard architecture with a 16-bit instruction word, 8-bit data path, hardware multiply, and a 31-level hardware stack, yielding roughly 10 MIPS sustained throughput at 48 MHz. The integrated SIE (Serial Interface Engine) handles USB framing and endpoint management in hardware, leaving the CPU free for application logic - this is a significant system-bill-of-materials reduction versus external USB interface chips. Typical applications for this part include USB HID peripherals such as custom keyboards, mice, and game controllers, USB-to-UART bridges, low-speed data loggers with PC connectivity, embedded development platforms (it appears in many PICDEM FS USB boards), industrial sensor nodes communicating over USB, and learning/hobby projects that benefit from a through-hole 40-pin package for breadboarding. The PDIP form factor is especially useful for prototypes and educational designs where socketed parts are reused. When designing with this part, the engineer should note the difference between the LF (low-voltage, 2.0-5.5 V) and the F (4.2-5.5 V only) variants, and ensure the 48 MHz internal or crystal configuration matches the USB Full-Speed PLL requirement. For long-term production, consider the surface-mount PIC18LF4455-I/PT (TQFP-44) variant once the design stabilizes, since the PDIP package is generally priced higher and aimed at low-volume or development use. This page consolidates distributor pricing, verified drop-in alternatives in the same 40-PDIP package, and practical design notes that go beyond the manufacturer datasheet to help engineers sourcing and qualifying the part.

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PIC18LF4455T-I/ML

PIC18LF4455T-I/ML - 48MHz USB MCU 24KB Flash | Microchip

The Microchip Technology PIC18LF4455T-I/ML is an 8-bit PIC microcontroller from the PIC18F family featuring Full-Speed USB 2.0 (12 Mbit/s), 24 KB of Flash program memory, 2048 bytes of RAM, and a maximum CPU clock of 48 MHz, packaged in a 44-pin QFN (8x8 mm) with exposed thermal pad. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (Flash), volatile data memory (RAM), and a rich set of peripherals on a single silicon die. Within the broader taxonomy, the PIC18F family sits between Microchip's baseline PIC10/12/16 families and the higher-end PIC24/dsPIC families, targeting USB connectivity, mixed-signal embedded control, and human-interface designs. The 'LF' prefix denotes the wide-voltage F-variant core that operates across 2.0 V to 5.5 V, enabling direct Li-ion battery operation and supporting Microchip's nanoWatt power-saving modes. Key features include three serial communication ports (FS-USB 2.0 at 12 Mbit/s, I2C/SPI up to 10 Mbit/s, and an EUSART LIN-capable asynchronous port), 10-bit ADC with up to 13 channels, two capture/compare/PWM modules, and nanoWatt Technology for sleep currents down to nanoampere levels. The 44-pin QFN exposed pad provides a low thermal resistance path suitable for sustained full-speed USB operation without external heatsinking. The device uses Microchip's enhanced Harvard RISC architecture with a hardware multiplier and 16-bit instructions optimized for C-compiled code. The wide operating voltage window (2.0 V to 5.5 V) means the same firmware image can target both USB-powered 5 V designs and battery-powered 3.3 V or 2.5 V designs, reducing BOM variants. Typical applications include USB human-interface devices (HID) such as keyboards, mice, and game controllers; USB-to-UART bridges and CDC-class peripherals; embedded data loggers with USB mass storage; industrial sensor interfaces; and consumer electronics that require USB connectivity. The combination of FS-USB and nanoWatt low-power modes also makes the part suitable for USB-powered battery chargers. When designing with this part, ensure the exposed pad is soldered to a sufficiently large ground pour to maintain junction temperature within the -40 C to +85 C industrial range. The internal 48 MHz PLL drives the USB module; firmware must enable the PLL and wait for PLL lock before USB enumeration to avoid USB bus errors. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not available on the manufacturer datasheet, helping procurement and engineering teams evaluate the PIC18LF4455T-I/ML for new designs and re-spins.

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PIC18LF4455T-I/PT

PIC18LF4455T-I/PT - 8-bit 48MHz USB MCU 24KB Flash | Microchip

The Microchip Technology PIC18LF4455T-I/PT is an 8-bit RISC microcontroller in the PIC18F USB family featuring a 48 MHz PIC18 CPU core, 24 KB (12K x 16) of program Flash, 2048 bytes of SRAM, and 256 bytes of Data EEPROM, housed in a 44-pin TQFP (10x10 mm) package. It integrates a Full-Speed USB 2.0 peripheral (12 Mbit/s), making it a member of the nanoWatt XLP low-power family that operates across 2.0 V to 5.5 V supply rails. A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, and programmable peripherals. The PIC18 family extends this with a 16-bit instruction word architecture optimised for deterministic, byte-oriented C code generation, sitting above baseline PIC10/PIC12/PIC16 parts in Microchip's taxonomy. The LF (Low-Voltage/Flexible) suffix denotes the extended 2.0-5.5 V supply range and ultra-low-power nanoWatt XLP technology, allowing battery-powered designs. Key features of the PIC18LF4455T-I/PT include 24 KB self-programmable Flash with 100K erase/write cycles, an internal 8 MHz / 32 kHz oscillator block with PLL for 48 MHz operation, an integrated 5-bit DAC and 13-channel 10-bit ADC, three serial ports (FS-USB 12 Mbit/s, I2C, SPI up to 10 Mbit/s), and an asynchronous LIN-capable EUSART. Industrial temperature grade (-40C to +85C) and 35 instructions in the instruction set provide ample code density. The device uses a Harvard RISC architecture with separate program and data buses, allowing instruction fetch and operand read in a single cycle. On-chip peripherals are mapped into the SFR space and include Comparators, PWM, Capture/Compare, and a CTMU for capacitive touch sensing. The integrated Full-Speed USB transceiver eliminates external PHY components for many HID/CDC designs. Typical applications include USB HID peripherals (keyboards, mice, custom input devices), industrial sensor interfaces with USB diagnostics, low-power data loggers, LIN/CAN gateway nodes, and battery-powered IoT edge devices. Industrial -40C to +85C rating and 2.0-5.5 V supply make it ideal for portable and USB-powered embedded designs. When designing with the PIC18LF4455T-I/PT, ensure that the USB D+/D- traces are routed as a 90-ohm differential pair and that VBUS sensing uses the internal 3.3V regulator output. The TQFP-44 footprint requires standard SMT reflow; no external programming voltage is needed for ICSP. This page synthesises distributor pricing, drop-in PIC18 family alternatives, and practical design notes that complement the manufacturer datasheet.

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PIC18LF4458-I/PT

PIC18LF4458-I/PT - 8-Bit 48MHz USB MCU, 24KB Flash | Microchip

The Microchip PIC18LF4458-I/PT is an 8-bit PIC18F-family microcontroller featuring a 48 MHz CPU clock, 24 KB (12K x 16) of Enhanced Flash program memory, 2 KB of SRAM and an integrated USB 2.0 Full-Speed peripheral, housed in a 44-pin TQFP (10x10 mm) package. It is part of Microchip's 24/40/44-pin high-performance, 12 MIPS, Enhanced Flash, USB MCU family with nanoWatt Technology. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile data memory (RAM), and a rich set of digital and analog peripherals (timers, ADC, communication ports, USB, etc.) on a single silicon die. The PIC18F family sits in Microchip's 8-bit PIC taxonomy above the baseline PIC10/12/16 families, offering higher performance (up to 12 MIPS at 48 MHz), larger memory and the Enhanced Flash architecture with self-programmability. The PIC18LF4458 is the low-voltage 'LF' variant, optimized for operation down to 2.0 V, which makes it suitable for battery-powered or regulated 3.3 V designs. Key specifications include a 2.0 V to 5.5 V supply range, 34 digital I/O lines, integrated USB 2.0 Full-Speed transceiver, 10-bit ADC, multiple timers, I2C, SPI, USART, and nanoWatt power-management modes that drop current consumption to microampere levels during idle and sleep states. The 'I' suffix denotes an industrial temperature range of -40C to +85C. The device uses Microchip's Enhanced Harvard RISC architecture with a 16-bit instruction word and 8-bit data path. The 12 MIPS (million instructions per second) throughput at 48 MHz is sufficient for real-time USB class firmware (CDC, HID, MSD), sensor processing, and human-interface control loops. The on-chip 24 KB Enhanced Flash supports self-programming under firmware control, enabling bootloader-based field updates. Typical applications include USB peripherals (HID keyboards, mice, gamepads, CDC serial adapters), industrial data-acquisition front-ends, home-automation controllers, smart sensors with USB diagnostics ports, and low-cost consumer electronics that need USB connectivity without a dedicated PHY IC. Designers value the LF variant when system rails are already 3.3 V and the USB bus is self- or bus-powered. When laying out the 44-pin TQFP, place the decoupling capacitors (100 nF plus 4.7 uF bulk) as close as possible to VDD/VSS pairs, route the D+/D- USB pair with 90 ohm differential impedance, and ensure the exposed pad (if present) is soldered to the ground plane for thermal and electrical performance. Always include a 0.1 uF cap on VUSB when the internal USB regulator is used. This page synthesizes distributor pricing, drop-in compatible alternatives, application notes and design considerations that go beyond what is printed on the Microchip datasheet, helping engineers select the right MCU quickly and avoid common layout pitfalls.

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PIC18LF4458T-I/ML

PIC18LF4458T-I/ML - 48MHz 8-Bit USB MCU 24KB Flash 44-QFN | Microchip

The Microchip Technology PIC18LF4458T-I/ML is an 8-bit PIC18F microcontroller featuring a 48 MHz (12 MIPS) enhanced Harvard core, 24 KB (12K x 16) of self-programmable Flash program memory, and 2 KB of SRAM, packaged in a 44-pin QFN (8x8 mm) with exposed thermal pad. The 'LF' prefix denotes the 2.0V-5.5V wide VDD range, while the 'T' suffix indicates Tape & Reel packaging and 'I' marks the industrial -40C to +85C operating temperature grade. A PIC18 microcontroller is an 8-bit reduced-instruction-set computing (RISC) engine using a modified Harvard architecture with separate program and data buses; the PIC18 family specifically adds 16-bit instructions, hardware multiply, and a C-optimized instruction set that bridges legacy 8-bit code with modern C compilers. Within Microchip's hierarchy, PIC18 sits between baseline PIC10/12/16 and the 16-bit dsPIC/PIC24 families, targeting mid-range embedded USB, sensing, and human-interface applications where deterministic real-time response and low cost matter more than raw MIPS. Key features of the PIC18LF4458T-I/ML include a full-speed USB 2.0 FS transceiver with on-chip 3.3V regulator and 1.5 kB of endpoint RAM; a 12-channel 10-bit ADC with auto-acquisition; two USARTs, one SPI, and one I2C (Master/Slave); a 16-bit timer/counter plus two 8-bit timers; a 9-channel 10-bit PWM module; nanoWatt power management with multiple idle/sleep modes; and 34 digital I/O pins tolerant of 5V logic on a VDD-Domain digital supply. Architecturally, the device integrates an internal 8 MHz oscillator with a 4x PLL (yielding the 48 MHz FOSC) and supports crystal, resonator, and external clock sources. The 24 KB Flash is partitioned for a 32 KB bootloader-compatible region, while the 2 KB SRAM supports USB endpoint buffer allocation. The exposed pad (EP) of the QFN-44 must be soldered to a sufficient ground copper pour to meet the 31 C/W theta-JC thermal envelope; otherwise the silicon will fold back oscillator activity when junction temperature exceeds 150C. Typical applications include USB Human Interface Devices (HID keyboards, mice, game controllers), CDC virtual COM ports, low-speed instrumentation bridges, industrial sensor nodes with USB firmware update, and legacy serial-port-to-USB migration designs. Industrial-grade temperature and wide VDD also suit process-control front ends and battery-backed accessories. Design tip: route the USB D+/D- pair as a 90-ohm differential, place the VBUS-sense resistor within 5 mm of the VBUS pin, and tie the exposed pad to a continuous GND pour. For EMI-sensitive links, the internal 3.3V USB regulator should be bypassed with 1 uF X7R plus 100 nF at the pin. This page consolidates distributor pricing, drop-in alternatives, and practical design guidance beyond what is found in the manufacturer datasheet alone.

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PIC18LF4458T-I/PT

PIC18LF4458T-I/PT - 48MHz 8-bit USB MCU, 24KB Flash | Microchip

The Microchip Technology PIC18LF4458T-I/PT is a low-voltage 8-bit PIC microcontroller from the PIC18F4553 family, featuring a 48 MHz CPU core, 24 KB of FLASH program memory (organized as 12K x 16), and 2 KB of SRAM, housed in a 44-pin TQFP (10x10 mm) package with tape-and-reel packaging. The device operates across a wide 2.0 V to 5.5 V supply range, making it well-suited for both battery-powered and 5 V regulated systems. An 8-bit microcontroller (MCU) is a programmable processor that executes instructions from internal program memory and interfaces with peripheral devices through digital and analog I/O. The PIC18 family is Microchip's high-performance 8-bit architecture, sitting under the broader taxonomy of microcontrollers -> embedded processors -> semiconductors. Within the PIC18 family, the 'F4458 variant integrates a full-speed USB 2.0 (low-speed/full-speed) transceiver, enabling direct USB device connectivity without an external PHY. Key features of the PIC18LF4458T-I/PT include 256 bytes of EEPROM data memory, a 10-bit Analog-to-Digital Converter (ADC) with up to 13 input channels, multiple Enhanced Capture/Compare/PWM (ECCP) modules, a Master Synchronous Serial Port (MSSP) supporting SPI and I2C, two Enhanced USART modules, an on-chip USB 2.0 full-speed transceiver, and a 10 MIPS instruction throughput at 48 MHz. The 'LF' prefix denotes the low-voltage 'F' core that runs from 2.0 V to 5.5 V, supporting both 3.3 V and 5 V rails. The 44-pin TQFP package offers a compact surface-mount footprint suitable for space-constrained designs, while the wide operating temperature range of -40 °C to +85 °C (industrial, I-grade) enables use in industrial, automotive (non-safety) and consumer applications. The part number suffix /PT identifies the TQFP package variant, and the 'T' before the temperature grade indicates tape-and-reel packaging. Typical applications include USB Human Interface Devices (HID) such as keyboards, mice and game controllers, USB-to-UART bridges, low-cost data loggers, industrial sensor interfaces, and educational/development boards. The integrated USB transceiver eliminates external PHY components, reducing BOM cost in USB peripherals. When designing with this device, ensure the 48 MHz clock source (either internal oscillator with PLL or external crystal) is stable before USB enumeration begins. Decouple VDD/VSS with at least 100 nF ceramic capacitors placed close to the pins, and follow Microchip application note AN956 for USB hardware design guidelines. This page synthesizes distributor pricing as of 2026-09-28, drop-in pin-compatible alternatives, comparison data, and practical design notes that are not collated in the manufacturer datasheet alone, giving engineers and buyers a single reference for sourcing and second-sourcing the PIC18LF4458T-I/PT.

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PIC18LF4458-I/PT - 8-Bit 48MHz USB MCU, 24KB Flash | Microchip

PIC18LF4458T-I/ML - 48MHz 8-Bit USB MCU 24KB Flash 44-QFN | Microchip

PIC18LF4458T-I/PT - 48MHz 8-bit USB MCU, 24KB Flash | Microchip