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PIC16LC64AT-04/PT - 8-bit PIC MCU, 3.5KB OTP, 4MHz | Microchip
PIC16LC64AT-04/PT

PIC16LC64AT-04/PT - 8-bit PIC MCU, 3.5KB OTP, 4MHz | Microchip

The Microchip Technology PIC16LC64AT-04/PT is an 8-bit RISC microcontroller built on low-power, high-speed CMOS EPROM/ROM technology, offering 3.5KB (2K x 14) of program memory and 128 bytes of RAM in a 44-pin TQFP (PT) surface-mount package. The device runs at 4 MHz using an external oscillator and operates across a wide 3.0 V to 6.0 V supply range, supporting Commercial, Industrial, and Extended temperature grades. Tape-and-reel packaging (TR) is standard for this factory-programmed (T suffix) variant. An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that integrates a CPU, non-volatile program memory (ROM/EPROM/Flash), peripherals (timers, A/D, communication) and I/O onto a single die. Within the broader taxonomy, an MCU is a subset of microprocessors (MPU) and is itself a type of embedded controller in the semiconductor hierarchy: microcontroller -> embedded processor -> IC. PIC16-series parts use Microchip's enhanced Harvard RISC architecture, with separate program and data buses allowing simultaneous instruction fetch and operand access. Key features include 33 digital I/O lines, a fully static design that allows the clock to be stopped without losing state, low-power CMOS process technology, and compatibility with the PIC16C6X family instruction set. The 4 MHz maximum clock and 14-bit instruction word are characteristic of mid-1990s PIC16 mid-range devices, optimized for deterministic interrupt response and low power rather than raw compute throughput. Internal peripherals documented in the PIC16CXX family datasheet include timers, capture/compare/PWM modules, an analog comparator, and synchronous/asynchronous serial ports. Typical applications include industrial control systems, automotive body electronics (within the extended temperature range), appliance control, sensor interface front-ends, and legacy embedded products requiring long-life-cycle 8-bit controllers. The wide operating voltage window (3.0 V to 6.0 V) also supports battery-backed designs and unregulated supply rails common in white-goods and HVAC equipment. When designing with this MCU, verify that code-size requirements fit within the 2K x 14 program memory and that the 33 I/O pins plus any oscillator/master-clear pins match the application's PCB layout. OTP (one-time programmable) devices cannot be re-programmed, so secure code images must be locked into the part at the programming house. This page synthesizes verified distributor pricing, drop-in alternative listings, and engineering design notes not aggregated on the manufacturer datasheet, helping engineers and procurement teams evaluate the PIC16LC64AT-04/PT against legacy PIC16C6X family members and modern PIC16F successors.

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PIC16LC64AT-04I/L - 8-bit OTP MCU, 4MHz, 3.5KB, 44-PLCC | Microchip
PIC16LC64AT-04I/L

PIC16LC64AT-04I/L - 8-bit OTP MCU, 4MHz, 3.5KB, 44-PLCC | Microchip

The Microchip Technology PIC16LC64AT-04I/L is an 8-bit RISC microcontroller from the PIC16C family, featuring 4 MHz maximum clock speed, 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of RAM, and 33 I/O pins housed in a 44-pin PLCC (J-Lead) package. The 'LC' suffix indicates a low-voltage CMOS variant optimized for 3.0 V to 5.5 V operation, while the 'T' suffix denotes a tape-and-reel packaging option and 'I' indicates the industrial operating temperature grade (-40C to +85C). The 'L' suffix in this part number denotes the 44-PLCC package. A PIC (Peripheral Interface Controller) microcontroller is a compact, self-contained computer-on-a-chip that integrates a CPU, memory, and peripherals into a single IC. The PIC16C family is part of Microchip's mid-tier 8-bit MCU lineup, sitting between the baseline PIC10/12/16 families and the higher-end PIC18 family. These MCUs use a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution for most opcodes. Within the broader taxonomy, an 8-bit MCU is a type of microcontroller -> embedded processor -> semiconductor IC. Key features include 35 single-word instructions (only 14-bit wide), single-cycle operation on all instructions except branches (which take two cycles), DC to 20 MHz operating speed, an 8-level hardware stack, and integrated I2C and SPI synchronous serial communication peripherals. The PIC16LC64A also integrates a watchdog timer, up to four timer modules, and a Capture/Compare/PWM (CCP) module, providing flexible embedded control for cost-sensitive applications. The PIC16LC64A core uses a RISC-based architecture with a 14-bit instruction word and 8-bit data path, achieving approximately 5 MIPS performance at 20 MHz. The integrated peripherals include a 10-bit (approximate) ADC, USART, I2C, SPI, and multiple timer/counter modules. The CMOS process delivers low power consumption with typical active current around 2-5 mA at 4 MHz, making it suitable for both battery-powered and line-powered designs. Typical applications include industrial control systems, consumer appliance control, automotive body electronics (non-safety), sensor signal conditioning, and low-cost embedded control where deterministic 8-bit processing is sufficient. The OTP program memory allows prototype-to-production migration with one-time-programmed code, lowering per-unit cost versus flash-based alternatives. When designing with this MCU, ensure the oscillator configuration is correctly selected (RC, XT, HS, or LP) to match the clock source, and that brown-out reset (BDR) is properly enabled for robust startup. The 44-PLCC package provides socket-friendly through-hole compatibility for prototyping and field-serviceable legacy systems. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16LC64AT-04I/PQ - 8-Bit PIC MCU, 4MHz, 3.5KB OTP, 44-MQFP
PIC16LC64AT-04I/PQ

PIC16LC64AT-04I/PQ - 8-Bit PIC MCU, 4MHz, 3.5KB OTP, 44-MQFP

The Microchip Technology PIC16LC64AT-04I/PQ is an 8-bit PIC microcontroller from the PIC16C family, operating at 4MHz with 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory, packaged in a 44-pin MQFP (10x10 mm) surface-mount form factor. The 'LC' suffix denotes the low-voltage CMOS variant designed for 3.0V-5.5V operation, while the 'T' indicates tape-and-reel packaging and 'I' specifies the industrial temperature range (-40C to +85C). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/Flash/OTP), data memory (RAM), and peripheral interfaces on one die. Within the broader taxonomy, the PIC16LC64A belongs to the PIC16 mid-range family -> PIC16C sub-family -> OTP-based PIC16C6X series -> PIC16LC6X low-voltage CMOS series -> 8-bit microcontroller -> microcontroller unit -> embedded controller -> semiconductor IC. The PIC architecture is a Harvard RISC design with 35 single-word instructions and single-cycle execution (except program branches which take two cycles). Key features include 128 bytes of RAM, 33 digital I/O pins, integrated peripherals such as PWM modules, Watchdog Timer (WDT), Brown-out Reset (BOR), Power-on Reset (POR), a synchronous serial port (SSP) supporting SPI/I2C, and a capture/compare/PWM (CCP) module. The core delivers deterministic 4MHz operation at 3.0V-5.5V, suitable for low-power battery-fed designs and industrial control loops. The 44-MQFP package provides compact board area while exposing the full peripheral set through dedicated pins. The PIC16LC64A uses a modified Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. Its CMOS process and static design allow operation down to DC clock frequencies, and the integrated oscillator supports crystal, resonator, or external clock sources. The OTP program memory supports one-time programming, making this part cost-optimized for high-volume production where firmware is finalized. Typical applications include industrial automation controllers, sensor interface modules, motor control peripherals, low-power consumer appliances, and embedded control subsystems requiring a low pin count with mid-range analog/digital integration. The wide operating voltage and industrial temperature grade suit automotive under-hood and factory-floor installations. When designing with this MCU, ensure the configuration bits are set correctly to select the oscillator mode and disable unneeded peripherals to minimize quiescent current. The OTP memory is one-time programmable, so firmware must be fully validated before committing to production. This page synthesizes distributor pricing, lifecycle status, drop-in alternatives within the 44-MQFP footprint, and practical engineering guidance not consolidated in the manufacturer datasheet alone.

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PIC16LC65A-04/P - 8-Bit 4MHz 7KB OTP MCU | Microchip | DIP-40
PIC16LC65A-04/P

PIC16LC65A-04/P - 8-Bit 4MHz 7KB OTP MCU | Microchip | DIP-40

The Microchip PIC16LC65A-04/P is an 8-bit CMOS RISC microcontroller built around the PIC16 core, integrating 7KB (4K x 14) of One-Time-Programmable (OTP) program memory and 192 bytes of RAM in a 40-pin PDIP (DIP-40, 0.600 inch / 15.24 mm) through-hole package. It operates from a 3.0V to 5.5V supply and supports a maximum oscillator frequency of 4 MHz at this speed grade. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals. The PIC16C/LC family belongs to the broader 8-bit microcontroller category, which sits under the embedded computing -> semiconductor device hierarchy. LC variants are designed for low-voltage operation (down to ~2.5-3.0V), making them suitable for battery-powered designs where 'LC' stands for Low-power CMOS. Key features include 33 digital I/O lines, an 8-channel 8-bit ADC, two 8-bit timers and one 16-bit timer, a USART for serial communication, a Capture/Compare/PWM (CCP) module, and a watchdog timer with its own on-chip RC oscillator for maximum reliability. The architecture is fully static, uses a Harvard design with separate program and data buses, and offers 35 single-word instructions where all instructions execute in a single cycle except program branches (two cycles). The 4 MHz speed grade (the '-04' suffix) corresponds to a 4 MHz oscillator input with a 1 microsecond instruction cycle, balancing throughput and power consumption. The 40-pin PDIP form factor is the classic through-hole industrial/Educational/Maker-friendly footprint, ideal for breadboards, IC sockets, legacy upgrades, and test fixtures where mechanical robustness matters more than board area. Typical applications include industrial control front-ends, appliance controllers, instrumentation subsystems, low-power sensor nodes, and educational development boards. The OTP memory suits volume production where the firmware is fixed and field-reprogramming is not required; for flash-based flexibility, the PIC16F-series is the typical upgrade path. When designing with this MCU, account for the OTP memory limitation by using a UV-erasable windowed (JW) variant for prototype development, then migrating to the OTP 'P' package for production. Ensure your in-circuit emulator or programmer (e.g., PICSTART Plus, MPLAB PM3) supports the LC low-voltage range before committing to a hardware platform. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16LC65A-04/PQ - 4MHz 8-Bit OTP MCU 7KB | Microchip PQFP-44
PIC16LC65A-04/PQ

PIC16LC65A-04/PQ - 4MHz 8-Bit OTP MCU 7KB | Microchip PQFP-44

The Microchip Technology PIC16LC65A-04/PQ is an 8-bit RISC microcontroller from the PIC® 16C family, built on CMOS technology, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O lines. Housed in a 44-pin Plastic Quad Flat Pack (PQFP/MQFP) surface-mount package, this part operates at a maximum clock speed of 4 MHz from a 3.0V to 5.5V supply and is intended for embedded control in industrial and commercial designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and peripherals on one die. Within the broader taxonomy, the PIC16LC65A sits in the 8-bit MCU category, beneath general-purpose microcontrollers and semiconductor ICs. The 'LC' suffix denotes Microchip's low-voltage CMOS process, allowing operation down to 3.0V for battery-friendly applications, while the 'A' revision is an enhanced silicon revision of the original PIC16C65 core. The /PQ suffix uniquely identifies the 44-pin PQFP package variant for surface-mount assembly. Key specifications include 35 single-word instructions (all single-cycle except two-cycle branches), a 14-bit instruction set, 8-channel 8-bit analog-to-digital conversion, USART, SSP, and capture/compare/PWM peripherals. The device integrates a watchdog timer with on-chip RC oscillator, power-on reset, power-saving sleep mode, and an operating speed up to DC-4 MHz at 5V. The PIC16LC65A-04/PQ provides enhanced features including code protection, brown-out detection, and in-circuit serial programming. Architecturally, the PIC16LC65A-04/PQ uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access in a single cycle. Its CMOS implementation gives low power consumption, with typical standby currents under 1 µA in sleep mode. The 4 MHz oscillator speed (the '04' suffix indicates 4 MHz timing) makes the part suitable for control loops, simple user interfaces, and serial-protocol bridging where higher MIPS are unnecessary. Typical applications include industrial automation controllers, HVAC control boards, security alarm panels, automotive body electronics (non-safety), remote sensor nodes, and consumer appliances. Its 33 I/O lines comfortably drive LED matrices, keypads, LCDs, and relay banks. The PIC16LC65A-04/PQ also serves as a serial-protocol converter between RS-232, I²C, and SPI peripherals in mixed-system designs. When designing with this part, account for OTP memory constraints: code must be perfect before commit because OTP cannot be erased. For prototyping, consider the windowed ceramic DIP variant (PIC16LC65A-04/JW) for UV-erase development. Use the ICD (In-Circuit Debugger) header for real-time emulation prior to committing OTP bits. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers a single reference for sourcing the PIC16LC65A-04/PQ.

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PIC16LC65A-04/PT - 8-Bit MCU, 7KB OTP, 4MHz, TQFP-44 | Microchip
PIC16LC65A-04/PT

PIC16LC65A-04/PT - 8-Bit MCU, 7KB OTP, 4MHz, TQFP-44 | Microchip

The Microchip Technology PIC16LC65A-04/PT is a low-power 8-bit CMOS microcontroller from the PIC16C family, featuring 7KB of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins. It operates at a maximum clock speed of 4 MHz and is housed in a 44-pin TQFP (PT) surface-mount package. The 'LC' suffix denotes the low-voltage CMOS process that supports operation from 2.5V to 5.5V, making it suitable for battery-powered and energy-efficient embedded designs. What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of Harvard-architecture 8-bit RISC microcontrollers originally developed by General Instrument's Microelectronics Division and popularized by Microchip Technology. PIC microcontrollers occupy the product hierarchy: microcontroller -> embedded processor -> semiconductor IC. They integrate a CPU core, program memory (ROM/Flash/OTP), data memory (RAM), peripherals (timers, ADC, USART, I/O ports), and a clock generator in a single chip, providing a complete compute platform for embedded control applications. Key features of the PIC16LC65A-04/PT include a 14-bit instruction word with 35 single-word instructions, 8-level deep hardware stack, two 8-bit timers and one 16-bit timer, a 5-channel 8-bit ADC, USART serial port, and watchdog timer with on-chip RC oscillator. The device supports in-circuit serial programming (ICSP) and offers brown-out reset (BOR) circuitry for reliable operation in noisy industrial environments. The 33 I/O pins are organized into five ports (RA, RB, RC, RD, RE) capable of sinking or sourcing up to 25 mA per pin for direct LED or relay drive. Architecturally, the PIC16LC65A employs a modified Harvard architecture with separate program and data buses, enabling instruction fetch and operand read in a single cycle. The 4 MHz oscillator allows a 1 MHz instruction rate (4:1 clock-to-instruction ratio, or 250 ns per instruction). The OTP program memory is programmed once and is non-erasable, making this part economical for medium-volume production where code stability is required but firmware updates are not anticipated. Typical applications include industrial control panels, home appliance controllers, automotive body electronics, HVAC thermostat units, security system keypads, and battery-powered sensor interfaces. The wide 2.5V-5.5V operating range allows direct connection to single-cell Li-ion or two-AA battery stacks. When designing with the PIC16LC65A-04/PT, note that OTP memory cannot be re-programmed; consider PIC16F74-I/PT (Flash-based, 40-pin PDIP) or PIC16F77-I/PT (Flash, 44-pin TQFP) for development or production runs requiring firmware updates. Use MPLAB X IDE with MPASM or XC8 compiler for code development and ICSP for device programming. This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16LC65A-04I/P - 8-Bit MCU, 7KB OTP, 4MHz, 40-PDIP | Microchip
PIC16LC65A-04I/P

PIC16LC65A-04I/P - 8-Bit MCU, 7KB OTP, 4MHz, 40-PDIP | Microchip

The Microchip Technology PIC16LC65A-04I/P is an 8-bit CMOS microcontroller belonging to the PIC16C family, featuring 7KB (4K x 14) of One-Time Programmable (OTP) program memory, 192 bytes of data RAM, and 33 digital I/O lines, all housed in a 40-pin PDIP (Plastic Dual In-line Package). It operates at a maximum clock speed of 4 MHz from a 3V to 5.5V supply voltage and is rated for the industrial -40C to +85C temperature range. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and programmable peripheral I/O. Within the broader hierarchy, MCUs sit under microcontrollers -> embedded processors -> semiconductors. The PIC16C family specifically refers to Microchip's OTP-programmed mid-range 8-bit cores that use a Harvard architecture with separate program and data buses, 14-bit wide instruction words, and a RISC-style instruction set of 35 single-word instructions - most executed in a single instruction cycle except program branches (two cycles). These architectural choices minimise external component count while delivering deterministic real-time response. Key differentiating features include the Harvard bus architecture with 14-bit instructions, five 8-bit digital I/O ports, a synchronous serial port (SSP) supporting SPI and I2C, a USART, an 8-bit timer/counter with prescaler, dual analog comparators, capture/compare/PWM modules, and a programmable brown-out reset. The /I suffix denotes industrial temperature grade and the /P suffix denotes the PDIP-40 plastic DIP package, both confirmed by Microchip part-numbering conventions. Typical applications include industrial control and automation, sensor interfacing, low-power embedded controllers, legacy peripheral replacement, and consumer white-goods logic where OTP programmability and the broad toolchain support of MPLAB IDE reduce time-to-market. The /I industrial temperature grade also suits factory-floor and outdoor enclosures not exposed to extended thermal excursions. When designing with this device, ensure that the chosen 3V-5.5V LDO or switching regulator supplies clean rail voltage with adequate decoupling (typically 100 nF plus 10 uF bulk) near the VDD pins. For new designs prefer a flash-based PIC16F equivalent (same pinout, in-system programmable) unless OTP and one-time cost-per-unit optimisation are explicit requirements of the BOM. The OTP memory cannot be erased, so firmware revision requires a physical part replacement.

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PIC16LC65A-04I/PQ - 8-bit MCU, 7KB OTP, 33 I/O, 44-MQFP | Microchip
PIC16LC65A-04I/PQ

PIC16LC65A-04I/PQ - 8-bit MCU, 7KB OTP, 33 I/O, 44-MQFP | Microchip

The Microchip Technology PIC16LC65A-04I/PQ is an 8-bit RISC microcontroller from the PIC16CXX OTP family, offering 7KB of one-time programmable program memory, 192 bytes of RAM, and 33 digital I/O pins in a 44-pin Metric QFP (MQFP/PQ) plastic surface-mount package. It is designed for 3.0V to 5.5V operation with a maximum oscillator frequency of 4 MHz, targeting cost-driven embedded control applications. Background: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and peripherals on one die. The PIC architecture belongs to the RISC (Reduced Instruction Set Computer) family, characterised by a small, fixed instruction set - typically 35 single-word instructions for the PIC16CXX core - where every instruction executes in a single instruction cycle except program branches, which take two. The PIC16LC65A uses a Harvard architecture with separate program and data buses, the program memory being one-time programmable (OTP) EPROM suitable for low-to-medium volume production runs where in-circuit programming flexibility is desired without the cost of windowed ceramic parts. In the broader taxonomy this part is: microcontroller -> 8-bit MCU -> PIC16 family -> RISC processor -> embedded computing. Key features include 33 I/O pins capable of driving LEDs, relays, or interfacing to sensors, an integrated analog comparator, a USART/SCI synchronous-asynchronous serial port, a 16-bit timer/counter with capture/compare/PWM, a Watchdog Timer with on-chip RC oscillator for safety-critical applications, and power-saving SLEEP mode. The device supports in-circuit debugging via the ICSP interface and is rated for the industrial -40C to +85C temperature range. Architecturally, the PIC16LC65A core executes one instruction per oscillator cycle (4-clock cycle), giving 1 MIPS at 4 MHz. Its OTP EPROM memory means each cell can be programmed once; it cannot be erased electrically but can be UV-erased in windowed variants (different MPN suffix). The device includes a wide operating voltage (3.0V-5.5V) suitable for both 3.3V and 5V systems, a brown-out reset, and a low-power SLEEP mode drawing microamp-level current. Typical applications include industrial automation controllers, automotive body and chassis subsystems, consumer electronics, white goods, HVAC controls, and small appliance motor control where 33 I/O and 192-byte RAM are sufficient. Trade-off to consider: the OTP memory is single-program only; for design-iteration cycles the flash-based PIC16F877A in the same 44-pin family is preferable. Always add 0.1uF decoupling near VDD and verify oscillator start-up time in your layout. This page synthesizes distributor pricing, drop-in alternatives from Microchip's own portfolio, and practical design considerations not found in the manufacturer datasheet.

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PIC16LC65AT-04/L - 8-Bit PIC MCU, 7KB EPROM, 44-PLCC | Microchip
PIC16LC65AT-04/L

PIC16LC65AT-04/L - 8-Bit PIC MCU, 7KB EPROM, 44-PLCC | Microchip

The Microchip PIC16LC65AT-04/L is a low-power CMOS 8-bit PIC microcontroller with 7KB of One-Time Programmable (OTP) program memory, 192 bytes of RAM, and 33 general-purpose I/O pins, housed in a 44-pin PLCC surface-mount package. It is part of the PIC16CXX mid-range family and operates at up to 4 MHz from a 3.0V to 5.5V supply, making it suitable for low-voltage and battery-backed applications. What is an 8-bit microcontroller? An 8-bit MCU is a single-chip computer with an 8-bit data path that fetches, decodes, and executes instructions stored in program memory; it integrates a CPU, RAM, ROM/EPROM/Flash, timers, digital I/O, and communication peripherals on one die. The PIC architecture falls within the broader taxonomy of microcontroller -> embedded controller -> semiconductor. The PIC16CXX mid-range family uses a 14-bit instruction word and a RISC core with only 35 single-word instructions, delivering deterministic single-cycle execution (except for program branches which take two cycles). Key features of the PIC16LC65AT-04/L include 4 MHz maximum clock input, integrated analog comparator module, USART/SPI/I2C serial interfaces (peripheral functions selectable on multi-function pins), 8-bit ADC (12 channels on the 'LC65A), three timers (Timer0/Timer1/Timer2), and a programmable watchdog timer with on-chip RC oscillator for reliable operation without external components. Power management features include SLEEP mode with wake-up via interrupts and an internal brown-out reset (BOR) circuit on selected variants. Designers should note the 'LC' prefix denotes the low-voltage CMOS process, drawing roughly half the supply current of the standard 'C' version and supporting operation down to 3.0V. The 'L' trailing suffix indicates the package style (PLCC here); the 'T' mid-suffix indicates tape-and-reel packaging and the '-04' speed grade marks the 4 MHz maximum clock. The PIC16LC65AT-04/L is pin-compatible with the PIC16C65AT-04/L and PIC16F65 family members, allowing hardware reuse across OTP and Flash-based designs. Typical applications include industrial control systems, remote sensor data acquisition, low-power telemetry, appliance controllers, automotive body electronics (non-safety), and instrument panels. The combination of low-voltage operation, multiple serial interfaces, and generous digital I/O suits networked sensor nodes and human-machine interface (HMI) sub-systems. When designing with this MCU, engineers should place a 0.1 uF decoupling capacitor close to the VDD pins, route the MCLR reset line to a controlled pull-up network, and verify unused I/O pins are configured as outputs to minimise quiescent current. The 44-PLCC footprint is large by current standards but still used in legacy industrial systems where socketed replacement of the OTP part is desirable. This page synthesises distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping procurement and embedded engineers rapidly assess PIC16LC65AT-04/L suitability for both new designs and legacy field replacements.

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PIC16LC65AT-04/PQ - 4MHz 8-Bit OTP MCU, 7KB, 44-MQFP | Microchip
PIC16LC65AT-04/PQ

PIC16LC65AT-04/PQ - 4MHz 8-Bit OTP MCU, 7KB, 44-MQFP | Microchip

The Microchip Technology PIC16LC65AT-04/PQ is an 8-bit PIC16C-family RISC microcontroller in a 44-pin Metric Quad Flat Pack (MQFP, package code PQ) surface-mount package. It integrates 7KB (4K x 14) of One-Time Programmable (OTP) program memory, 192 bytes of data RAM, and runs at a maximum clock speed of 4MHz from a 3V to 5.5V supply. The 'T' suffix indicates tape-and-reel packaging for high-speed SMT assembly, while the '04' designator marks the 4MHz speed grade, and 'LC' identifies the low-voltage/low-power CMOS process variant. An 8-bit PIC microcontroller is a Harvard-architecture RISC device that executes one instruction per clock cycle (except branches, which take two). The PIC16C family, to which this part belongs, pioneered the OTP-programmed PIC architecture that has since evolved into the flash-based PIC16F family. MCUs such as the PIC16LC65A sit at the bottom of the embedded controller hierarchy: they integrate CPU core, non-volatile program memory, RAM, peripherals, and I/O into a single die, and they typically replace discrete logic in consumer, industrial, and appliance applications where deterministic real-time behavior is more important than absolute compute throughput. Key features include 33 general-purpose digital I/O pins, three serial communication peripherals (I2C/SPI for short-distance inter-chip links and a UART/USART for asynchronous serial), and a high-performance RISC CPU with only 35 single-word instructions. The CMOS LC process variant lowers quiescent current draw relative to the standard 'C' die, allowing battery-friendly operation in the 3V-5.5V window. Multiple timer/counter modules support PWM generation and event timing. The 44-MQFP package is a JEDEC-standard 10x10mm metric quad flat pack suitable for surface-mount assembly. Technically, the PIC16LC65A uses a 14-bit instruction word and a separate 8-bit data path, enabling compact code density compared with 8-bit CISC alternatives. Its deterministic 4-cycle instruction timing simplifies real-time scheduler design. Brown-out detection and a watchdog timer enhance field reliability in unattended industrial installations. Typical applications include embedded control for industrial automation, HVAC, white goods, security alarm panels, and low-cost general-purpose control boards. Its combination of I2C, SPI, and UART peripherals makes it well-suited as a sensor hub or display controller. Designers also use the PIC16LC65A as a logic-replacement MCU bridging discrete components and modern bus interfaces. When designing with this part, note that the 'LC' suffix requires a regulated supply within 3.0V-5.5V. Decoupling the VDD/VSS pair with 100nF ceramic capacitors placed within 5mm of each pin pair is recommended to suppress switching noise. This page consolidates verified distributor pricing, drop-in Microchip PIC16LC65A-family alternatives, and practical design guidance not gathered in a single document elsewhere.

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PIC16LC65AT-04/PT - 8-bit MCU, 7KB OTP, 4MHz, 44-TQFP | Microchip
PIC16LC65AT-04/PT

PIC16LC65AT-04/PT - 8-bit MCU, 7KB OTP, 4MHz, 44-TQFP | Microchip

The Microchip Technology PIC16LC65AT-04/PT is an 8-bit CMOS RISC microcontroller from the PIC16C family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 x 8 bytes of RAM, and 33 digital I/O pins in a 44-pin TQFP (10x10 mm) surface-mount package. According to distributor data, it operates at up to 4 MHz from a 2.5 V to 6.0 V supply, and integrates on-chip peripherals including I2C, SPI, and UART/USART communication interfaces. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and peripheral interfaces. Within the broader taxonomy, an MCU belongs to the category of microcontrollers, which in turn fall under embedded processors and digital ICs. The PIC16C family specifically targets low-cost, high-performance 8-bit applications using a Harvard-architecture RISC core with a small, deterministic instruction set ideal for real-time control. Key features of the PIC16LC65AT-04/PT include a 14-bit wide instruction word, an integrated watchdog timer, power-saving SLEEP mode, and parallel slave port support. The wide 2.5 V to 6.0 V supply range allows operation from both 3.3 V and 5 V rails commonly used in industrial and consumer designs. The 'LC' suffix denotes the low-power CMOS process variant, and the 'T' denotes tape-and-reel packaging for high-volume assembly. The device uses a fully-static CMOS design, allowing the clock to be stopped and restarted without losing internal state - a key feature for low-power sleep/wake duty-cycled applications. With 33 I/O lines, designers have ample connectivity for sensors, buttons, displays, and external peripheral chips. Typical applications include industrial control panels, simple sensor interfaces, low-cost motor control, appliance control boards, and embedded data-acquisition front ends. The integrated I2C/SPI/UART peripherals make it well suited as a communication gateway or slave controller. The 44-TQFP package provides a manageable footprint for hand-rework-friendly prototypes while remaining compatible with automated SMT lines. When designing with this device, note that OTP memory cannot be reprogrammed, so code must be fully validated before committing. For new designs, consider migrating to the flash-based PIC16F877A or PIC16F887 family (same 44-pin TQFP footprint, drop-in compatible pinout) to enable in-system reprogramming and shorter development cycles. This page synthesizes current distributor pricing, drop-in compatible Microchip alternatives from the same PIC16 family, and practical design guidance not found in the bare datasheet.

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PIC16LC65AT-04I/PQ - 4MHz 8-Bit OTP MCU 7KB Flash 44-MQFP | Microchip
PIC16LC65AT-04I/PQ

PIC16LC65AT-04I/PQ - 4MHz 8-Bit OTP MCU 7KB Flash 44-MQFP | Microchip

The Microchip Technology PIC16LC65AT-04I/PQ is an 8-bit CMOS RISC microcontroller belonging to the PIC® 16C mid-range family, operating at a maximum clock frequency of 4 MHz and supplied in a 44-pin Metric QFP (MQFP, 10x10 mm) surface-mount package. It integrates 7 KB (4K x 14) of One-Time Programmable (OTP) program memory, 192 bytes of data RAM, and 33 general-purpose digital I/O pins. The device operates across a 2.5 V to 6.0 V supply voltage range and provides hardware serial communication peripherals including I²C (MSSP), SPI (MSSP), and USART. An OTP microcontroller is a flash-less variant of programmable non-volatile memory that can be written exactly once using a programmer device; unlike EPROM it does not require a UV eraser window, making it well-suited for cost-sensitive volume production where firmware is finalized. Within the broader PIC taxonomy, the PIC16LC65A sits in the mid-range 14-bit instruction core family, between the baseline 12-bit PIC10/12/16 architectures and the enhanced 16-bit PIC17/PIC18 cores. The LC (low-power CMOS) suffix indicates a process variant optimized for low quiescent current draw relative to the standard 16C65A. Key features of the PIC16LC65AT-04I/PQ include 8-bit timer/counter modules, a 10-bit successive-approximation ADC, a hardware capture/compare/PWM module, and a programmable watchdog timer with on-chip RC oscillator. The part supports in-circuit serial programming (ICSP) via two pins (RB6/RB7) for production-line firmware loading. Power-managed sleep mode draws microamp-level current, making the device usable in battery-powered or energy-harvesting designs. The -04 speed suffix specifies a 4 MHz oscillator grade and the I/PQ suffix denotes the industrial temperature range (-40 °C to +85 °C) with the 44-pin MQFP package. The PIC16LC65AT-04I/PQ implements the standard mid-range 14-bit instruction set with 35 single-word instructions; all instructions execute in one instruction cycle except for program branches, which take two cycles. This deterministic timing simplifies real-time control-loop implementation. The device includes a multi-source interrupt controller, an 8-level hardware stack, and a power-on reset (POR) block with brown-out reset (BOR) protection. Typical applications include appliance controls, low-end industrial sensor interfaces, smart card readers, automotive body modules (non-AEC-Q100), LED display controllers, and embedded remote-keyless-entry receivers. The 33 GPIO pins support matrix keypads, character LCD interfaces, and parallel sensor buses. Designers also use this part in legacy equipment designs that require exact 5 V tolerant PIC16C mid-range code compatibility. When designing with this device, ensure the brown-out-reset voltage threshold is configured below the minimum operating rail to avoid unintended resets in noisy environments. Decoupling capacitors (100 nF ceramic + 10 µF bulk) must be placed within 5 mm of the VDD/VSS pins. OTP parts cannot be firmware-updated in the field, so reserve an external SPI EEPROM for any device-revision data. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found in the manufacturer datasheet alone.

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PIC16LC65AT-04I/PT - 8-bit MCU, 7KB OTP, 4MHz, 44-TQFP | Microchip
PIC16LC65AT-04I/PT

PIC16LC65AT-04I/PT - 8-bit MCU, 7KB OTP, 4MHz, 44-TQFP | Microchip

The Microchip Technology PIC16LC65AT-04I/PT is an 8-bit CMOS flash/OTP microcontroller from the PIC16CXX family, integrating 7KB (4K x 14) of one-time-programmable program memory and 192 bytes of RAM in a 44-pin TQFP (10x10 mm) package. Operating at up to 4 MHz from a low-voltage core supply, the device targets designs that require the classic PIC instruction set, 25 I/O lines, and a peripheral set including timer modules, capture/compare/PWM, a USART/SCI port, and an 8-bit ADC. An OTP-based PIC16 microcontroller is a member of the 8-bit microcontroller family (PIC16 -> mid-range 8-bit MCU -> microcontroller -> embedded processor -> semiconductor). The "LC" prefix denotes the low-voltage CMOS variant, allowing operation across 2.5 V to 6.0 V system rails and suiting battery-backed instrumentation. The OTP program memory provides one-time programmable storage - ideal for mature, stable firmware in production where re-programmability is not required. Key features include a Harvard RISC architecture with 35 single-word instructions, an 8-level deep hardware stack, an integrated Power-on Reset and Brown-out Reset, a Watchdog Timer with its own on-chip RC oscillator, and three I/O ports (PORTA/PORTB/PORTC). The PIC16CXX core delivers deterministic 4 MHz instruction throughput suitable for real-time control loops. The part's 44-pin TQFP (PT) package exposes 33 digital I/O lines, three timer/counter modules, a synchronous/asynchronous USART, and a 5-channel 8-bit ADC. This peripheral combination supports moderate-complexity embedded designs such as motor control loops, sensor front-ends, and human-machine interfaces. Typical applications include industrial process controllers, sensor signal conditioning front-ends, low-power instrumentation, motor control PWM drivers, and white-goods control boards. The -04I suffix specifies the 4 MHz speed grade and the industrial -40C to +85C operating temperature range. Designers select this part for mature, low-cost production builds where the OTP cost advantage outweighs the need for in-field re-programmability.

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PIC16LC65B-04/L - 4MHz 8-Bit OTP MCU 7KB | Microchip | 44-PLCC
PIC16LC65B-04/L

PIC16LC65B-04/L - 4MHz 8-Bit OTP MCU 7KB | Microchip | 44-PLCC

The Microchip Technology PIC16LC65B-04/L is an 8-bit CMOS microcontroller from the PIC® 16C family, delivering 4 MHz CPU performance with 7 KB (4K x 14) of one-time-programmable (OTP) program memory and 192 bytes of SRAM in a 44-pin PLCC (16.59 x 16.59 mm) package. The "LC" suffix denotes the low-voltage CMOS variant that operates across 3.0 V to 5.5 V, and the "-04" speed grade corresponds to a 4 MHz oscillator input, while "/L" specifies the PLCC through-hole lead form. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces onto one IC. The PIC16C65B belongs to the mid-range PIC architecture that sits hierarchically between simple PIC10/12/14 baseline parts and the higher-pin-count PIC17/18 families. LC-series parts specifically target battery-friendly portable and industrial applications where the standard PIC16C65B's 4.5 V minimum would be too high. Within the broader taxonomy: 8-bit microcontroller -> RISC MCU -> microcontroller -> embedded IC -> semiconductor. Key features include 33 digital I/O pins, a hardware USART, MSSP (SPI/I2C), two 8-bit timers plus one 16-bit timer with capture/compare/PWM, a 10-bit multi-channel ADC, and the standard PIC mid-range 35-instruction RISC core executing instructions in one instruction cycle (except branches, which take two). The 44-PLCC package gives generous PCB real estate for legacy through-hole designs and educational platforms where socketed replacement is desirable. Typical applications include industrial control panels, HVAC thermostats, security alarm keypads, appliance user-interface boards, point-of-sale terminals, and legacy embedded systems where the 16C mid-range toolchain is well understood. Designers choose this part when migrating older PIC16C65 designs to a lower-voltage supply rail, or when a robust OTP MCU is needed for production runs that do not require re-programmability. Designers favor the LC variant specifically for portable instrumentation where dropping the supply to 3.3 V is needed to extend battery life without leaving the PIC ecosystem. When designing with this part, verify that the chosen crystal or resonator meets the 4 MHz maximum at the in-circuit temperature extreme and budget adequate decoupling (100 nF plus 10 µF bulk) close to the VDD pins. The OTP nature of program memory means firmware must be fully validated before final programming, and unused I/O pins should be configured as outputs to minimize current draw.

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PIC16LC65B-04/P - 8-bit PIC MCU 7KB EPROM 4MHz | Microchip
PIC16LC65B-04/P

PIC16LC65B-04/P - 8-bit PIC MCU 7KB EPROM 4MHz | Microchip

The Microchip Technology PIC16LC65B-04/P is an 8-bit RISC microcontroller with 7KB EPROM program memory and 192 bytes of RAM, housed in a 40-pin PDIP (DIP-40) through-hole package. The "LC" family variant operates from 3V to 5.5V at up to 4MHz clock speed, targeting low-power applications. The device provides 33 digital I/O lines organized across multiple ports, two 8-bit and one 16-bit timer/counter modules, a USART for asynchronous/synchronous serial communication, and a PSP (Parallel Slave Port) for external peripheral interfacing. An 8-bit PIC microcontroller is a Harvard-architecture RISC processor optimized for embedded systems where deterministic instruction timing, low power consumption, and small code footprint are essential. The PIC16C/LC family uses a 14-bit instruction word and offers 35 single-word instructions, with all instructions executing in one instruction cycle except for program branches which take two cycles. This hierarchy places the PIC16LC65B within the broader categories of microcontroller -> embedded processor -> semiconductor IC. Key features include 7KB EPROM program memory (one-time programmable), 192 bytes of data RAM, 33 digital I/O pins, hardware USART, parallel slave port, two analog comparators, watchdog timer with on-chip RC oscillator, and power-on reset circuitry. The device operates across a commercial temperature range of 0C to +70C and supports in-circuit serial programming (ICSP) via dedicated RB6/RB7 pins. Architecture-wise, the PIC16LC65B uses an enhanced mid-range 14-bit core with separate program and data address spaces, enabling faster context switching and reduced interrupt latency. The EPROM program memory allows one-time field programming via standard EPROM programmers, while the LC variant's 3V-5.5V operating range makes it suitable for both 3.3V and 5V designs. Typical applications include industrial control systems, motor control peripherals, sensor interface modules, automotive body electronics (non-safety), consumer appliance controllers, and legacy embedded system maintenance. The 40-pin PDIP package simplifies prototyping and breadboarding. When designing with this device, note that the EPROM windowed ceramic variant requires UV erasure for reprogramming, while the standard OTP plastic variant cannot be erased. Modern designs should consider the PIC16F877A flash equivalent for new development.

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PIC16LC65B-04/PQ - 8-Bit 4MHz OTP MCU 7KB 33 I/O | Microchip
PIC16LC65B-04/PQ

PIC16LC65B-04/PQ - 8-Bit 4MHz OTP MCU 7KB 33 I/O | Microchip

The Microchip Technology PIC16LC65B-04/PQ is a low-power, 8-bit CMOS microcontroller from the PIC16CXX mid-range family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins. Operating from 2.5V to 5.5V at a maximum clock rate of 4MHz, this device is housed in a 44-pin Metric Quad Flat Pack (MQFP-44, 10x10 mm) package. The 'LC' prefix denotes the low-power CMOS variant optimized for battery and portable applications, while the '-04' suffix specifies the 4MHz maximum operating frequency. What is an 8-bit OTP microcontroller? An 8-bit microcontroller is a small computer-on-a-chip built around an 8-bit data bus, integrating a CPU core, program memory (here, OTP - one-time-programmable EPROM), data RAM, and peripherals into a single IC. OTP memory is programmed once and cannot be erased, making it ideal for high-volume production runs where code stability is locked. Within the broader semiconductor taxonomy, this part belongs to the microcontroller (MCU) category, which sits under microcontrollers and microprocessors in the integrated circuits hierarchy. Key features include 33 bidirectional I/O pins, an integrated analog-to-digital converter (ADC), three timer/counter modules, a USART for serial communication, and a synchronous serial port (SSP). The OTP program memory supports in-circuit serial programming (ICSP) via two pins, enabling production-line programming without removing the part. The MQFP-44 package provides ample pin count for embedded control tasks while maintaining a modest 10x10 mm footprint. Typical applications include industrial control systems, automotive body electronics, sensor interface modules, appliance controllers, and embedded data acquisition devices. The wide 2.5V-5.5V operating range allows direct connection to a single lithium cell, three alkaline cells, or regulated 5V rails, simplifying power supply design. Three timer/counter modules plus a USART support motor control, PWM generation, and master/slave multi-drop communication links. When designing with this device, note that OTP memory cannot be re-programmed; use the PIC16F65B or PIC16C65B flash/UV-erase equivalents for prototyping and field updates. Operating temperature is 0C to +70C (commercial grade); choose the PIC16LC65BT-04I/PQ industrial variant (-40C to +85C) for outdoor or automotive under-hood deployments. This page synthesizes current distributor pricing, drop-in Microchip PIC16 family alternatives, and practical MQFP-44 design notes not found in the manufacturer datasheet alone, helping engineers quickly evaluate substitutes and source decisions for production runs.

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PIC16LC65B-04/PT - 8-Bit 4MHz MCU 7KB OTP 44-TQFP | Microchip
PIC16LC65B-04/PT

PIC16LC65B-04/PT - 8-Bit 4MHz MCU 7KB OTP 44-TQFP | Microchip

The Microchip Technology PIC16LC65B-04/PT is an 8-bit RISC microcontroller from the PIC16CXX mid-range family, delivering 4 MIPS performance at 4 MHz while consuming low power from a 2.5V–5.5V supply. The part integrates 7 KB of OTP program memory (4K x 14 words), 192 bytes of RAM, 33 digital I/O lines, and a 5-channel 8-bit A/D converter, packaged in a 44-pin TQFP (10x10 mm) surface-mount form factor. Connectivity peripherals include one I2C/SPI bus, one UART/USART, Brown-out Detect/Reset, Power-on Reset, PWM and a Watchdog Timer with its own on-chip RC oscillator for reliable operation. What is an 8-bit microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, integrating CPU core, non-volatile program memory, RAM, and peripheral set into one package. Microcontrollers sit within the broader semiconductor hierarchy as integrated circuits > microcontrollers > embedded controllers. PIC16 mid-range parts are widely used for cost-sensitive embedded control because they offer deterministic instruction execution (most instructions complete in one cycle except branches), a small footprint, and mature toolchain support from MPLAB IDE and XC8 compiler. Key features of the PIC16LC65B-04/PT include its 35 single-word instruction set, all single-cycle except program branches (2 cycles), and a separate programmable 8-bit prescaler for Timer0. The 44-pin TQFP package exposes 33 I/O pins distributed across PORTB, PORTC, and PORTD, with several pins multiplexed to ADC and serial-peripheral functions. The low-power "LC" silicon supports industrial-temperature operation, and the 4 MHz speed grade targets timing-sensitive control loops in motor, power-conversion and human-interface subsystems. Architecturally, the PIC16LC65B uses a Harvard RISC core with separate program and data buses, allowing instruction and operand access in a single clock cycle. The 14-bit instruction word enables single-cycle arithmetic, logic, and bit-manipulation operations, while the 8-bit data path keeps register and ALU complexity low for predictable interrupt latency. The on-chip ADC uses a successive-approximation register and is suitable for slow-changing analog signals such as temperature, voltage, or potentiometer feedback. Typical applications for this PIC16LC65B-04/PT include industrial control panels, appliance controllers, low-end instrumentation, sensor front-ends, and small motor-control boards. The combination of 33 I/O, an 8-bit ADC, PWM, UART and I2C/SPI gives the designer enough peripheral flexibility to replace several discrete components. The wide 2.5V–5.5V supply range also lets the same firmware target both 3.3V and 5V rails. Design consideration: OTP (One-Time Programmable) memory cannot be erased after programming, so for development and firmware iteration choose a windowed ceramic (JW) or Flash equivalent from the same family such as PIC16F877 or PIC16F887. Always place a 0.1 µF decoupling capacitor as close as possible to VDD/VSS and follow Microchip AN588 for oscillator-layout best practice. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found on a single manufacturer page.

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PIC16LC65B-04I/PT - 8-bit MCU 7KB OTP 192 RAM 33 I/O | Microchip
PIC16LC65B-04I/PT

PIC16LC65B-04I/PT - 8-bit MCU 7KB OTP 192 RAM 33 I/O | Microchip

The Microchip Technology PIC16LC65B-04I/PT is an 8-bit CMOS RISC microcontroller in the PIC16CXX mid-range family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin TQFP (PT) surface-mount package. It operates from a 3V to 5.5V supply, supports a maximum clock speed of 4 MHz (the "04" speed grade, with a 10 MHz "10" variant also available in the family), and offers high-performance RISC architecture with only 35 single-word instructions to learn. All instructions execute in a single cycle except program branches (two cycles), giving deterministic throughput for embedded control loops. Key features include an industrial operating temperature range of -40C to +85C (denoted by the "I" suffix), low-power CMOS design suitable for battery-aware systems, integrated peripherals typical of the PIC16C6x family (timers, USART, capture/compare/PWM, and analog comparator), and an OTP program memory that is one-time programmable for low-to-medium volume production. The 44-TQFP (PT) package measures 10x10 mm and is supplied in tray packaging for prototyping and low-volume builds. In the broader taxonomy, the PIC16LC65B belongs to the PIC16 mid-range MCU family, which sits under the PIC16Cxx OTP/EPROM branch of Microchip's 8-bit PIC microcontroller portfolio. Compared with PIC16F flash parts (e.g., PIC16F884), the "LC" OTP variant trades in-system re-programmability for lower unit cost in volume production, while remaining pin-for-pin compatible within the 44-TQFP (PT) footprint for many F/LC family members. Typical applications include industrial control panels, appliance controllers, sensor interfaces, low-cost data-acquisition front-ends, and any 8-bit control task where the developer values the PIC16 mid-range instruction set and ecosystem (MPLAB X IDE, MPASM, XC8 compiler) over modern Cortex-M0 alternatives. The PIC16LC65B-04I/PT is also commonly used as a pin-compatible second-source for the PIC16C65B-04I/PT in designs where extended lead-time has driven a switch to the LC variant.

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PIC16LC65BT-04/L - 8-Bit 4MHz 7KB OTP MCU 44-PLCC | Microchip
PIC16LC65BT-04/L

PIC16LC65BT-04/L - 8-Bit 4MHz 7KB OTP MCU 44-PLCC | Microchip

The Microchip Technology PIC16LC65BT-04/L is an 8-bit PIC mid-range microcontroller operating at 4 MHz, integrating 7 KB (4 K x 14) of One-Time-Programmable (OTP) program memory and 192 x 8 bytes of RAM in a 44-pin PLCC (J-Lead) package. The PIC16C6x family delivers RISC-style Harvard architecture with 33 digital I/O lines, three timer modules (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit), a USART, MSSP (SPI/I2C), 8-bit A/D channels, and capture/compare/PWM peripherals. Supply voltage spans 2.5 V to 5.5 V and the industrial temperature grade covers -40C to +85C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable peripheral interfaces. The PIC16C6x family belongs to Microchip's mid-range 8-bit PIC architecture, sitting below the enhanced PIC18 family and above the baseline PIC10/12/16 families. Mid-range PICs are commonly deployed in appliance controls, motor control, instrument clusters, and consumer embedded products where deterministic instruction execution and low BOM cost outweigh raw MIPS throughput. Key features include 35 single-word instructions (200 ns per instruction at 20 MHz oscillator), 8K x 14 program memory address space (7 KB usable in OTP), 192-byte data RAM, eight 8-bit A/D converter channels, a synchronous serial port configurable as SPI or I2C, an enhanced USART with 9-bit address detect, and a watchdog timer with on-chip RC oscillator. The 44-pin PLCC variant exposes 33 I/O pins while the 40-pin variants (P, JW) trade I/O count for a smaller footprint. Power-on reset, brown-out detect, and power-saving sleep mode are standard. The /L suffix designates the PLCC J-Lead windowed CERDIP-style form factor for legacy through-hole or socketed applications. Typical applications include HVAC thermostat control, vending machine controllers, security panel keypads, washing machine motor drivers, and industrial sensor interfaces where the PIC16C6x's deterministic timing and small footprint excel. The wide 2.5 V-5.5 V range enables direct battery or USB-powered designs. Pair with a 4 MHz resonator or crystal to drive the on-chip oscillator with PLL-like accuracy. Programming via ICSP allows in-circuit firmware updates with high-voltage (13.4 V) entry into the OTP memory. When designing with this device, ensure the MCLR pin is pulled high through a 10-100 kohm resistor and decoupled with 100 nF of low-ESR ceramic capacitance. The oscillator configuration bits select HS, XT, LP, or RC modes; match the resonator to the chosen mode. Brown-out voltage is selectable between 4.0 V and 2.5 V via the BOR configuration bit; verify the chosen threshold above Vdd_min to avoid spurious resets.

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PIC16LC65BT-04/PQ - 8-bit MCU, 7KB OTP, 4MHz, 44-MQFP | Microchip
PIC16LC65BT-04/PQ

PIC16LC65BT-04/PQ - 8-bit MCU, 7KB OTP, 4MHz, 44-MQFP | Microchip

The Microchip Technology PIC16LC65BT-04/PQ is an 8-bit CMOS RISC microcontroller from the PIC16CXX mid-range family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins, all housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm) package. The device operates at up to 4MHz clock speed from a 2.5V to 5.5V supply, making it suitable for low-power embedded systems that require moderate computational throughput and rich peripheral integration. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/OTP/Flash), data memory (RAM), timers, communication peripherals, and I/O ports into one package. The PIC16CXX mid-range family is a Harvard-architecture RISC core family that executes one instruction per clock cycle (except branches), providing deterministic timing and code density advantages for embedded control. The 'LC' in PIC16LC65B denotes the low-voltage CMOS variant optimized for 3.3V and battery-backed operation, while the '65B' indicates 7KB of program memory and an enhanced peripheral set including MSSP (SPI/I2C) and USART. The PIC16LC65BT-04/PQ is the windowed CERDIP-style MQFP 'PQ' package variant with industrial-temperature characterization. Key features include three timer modules (Timer0 8-bit with 8-bit prescaler, Timer1 16-bit with prescaler and external crystal increment during sleep, Timer2 8-bit), a 10-bit multi-channel Analog-to-Digital Converter, two analog comparators, a Universal Synchronous/Asynchronous Receiver Transmitter (USART), a Master Synchronous Serial Port (MSSP) supporting both SPI and I2C, and a Capture/Compare/PWM (CCP) module. The 14-bit instruction word and 35-instruction RISC set deliver predictable interrupt latency and deterministic control loop execution, which is critical for motor control and instrumentation applications. The PIC16LC65BT-04/PQ is engineered for industrial automation, consumer electronics, and embedded control applications requiring a balance of memory size, I/O count, and serial connectivity. The wide 2.5V to 5.5V operating range allows direct interface with both 3.3V and 5V logic systems, while the low-power CMOS design supports battery-backed and energy-conscious designs. The integrated MSSP and USART enable simultaneous SPI/I2C sensor connectivity and asynchronous serial communication with a host processor. Typical applications include industrial sensor interfaces, motor control front-ends, HVAC controllers, automotive body electronics, white-goods control boards, and point-of-sale (POS) terminals. When designing with this part, place 0.1uF decoupling capacitors on each VDD pin as close as possible to the package, use a low-ESR bulk capacitor on the analog AVdd rail, and verify the trace length on the external crystal matches the datasheet's load capacitance recommendation for stable oscillator start-up.

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PIC16LC65BT-04I/L - 8-bit MCU, 4MHz, 7KB OTP, 44-PLCC | Microchip
PIC16LC65BT-04I/L

PIC16LC65BT-04I/L - 8-bit MCU, 4MHz, 7KB OTP, 44-PLCC | Microchip

The Microchip PIC16LC65BT-04I/L is an 8-bit CMOS RISC microcontroller from the PIC16CXX mid-range family, featuring 7KB (4K x 14) of One-Time Programmable (OTP) program memory and 192 bytes of RAM. It operates at a 4 MHz clock speed, supports a 2.5V to 5.5V supply voltage range, and integrates 33 I/O lines along with I2C, SPI, and USART serial interfaces. The device is housed in a 44-pin PLCC (J-Lead) package measuring 16.59 x 16.59 mm, surface-mount compatible with standard PLCC sockets. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, and peripherals. The PIC16CXX mid-range architecture is one of three PIC lineages (base-line, mid-range, enhanced mid-range) and provides a 14-bit instruction word, 8-bit data path, and a hardware stack that balances code density with deterministic interrupt latency. Mid-range PICs remain popular in industrial control, sensor interfaces, and brown-out-aware embedded designs. Key features of the PIC16LC65BT-04I/L include three timer modules (Timer0 8-bit with prescaler, Timer1 16-bit with prescaler and external clock capability, Timer2 8-bit), a 5-channel 8-bit ADC, two PWM outputs, and an industrial operating temperature range of -40C to +85C. The -04 speed suffix designates a 4 MHz oscillator input, while the 'T' suffix indicates tape-and-reel packaging. The 'I' industrial temperature grade and 'L' package code (44-PLCC) are factory-burned identifiers per Microchip ordering nomenclature. The architecture uses a Harvard design with separate program and data buses, allowing simultaneous instruction fetch and data access. The 14-bit instruction set delivers compact code density, while the single-cycle ALU architecture provides predictable timing for real-time control loops. Internal brown-out reset and power-on reset simplify external supervision circuits. Typical applications include industrial automation controllers, sensor signal conditioning, motor drive interface boards, HVAC fan/valve controllers, and embedded human-machine interface panels. The PIC16CXX mid-range family is widely deployed in brown-out-sensitive industrial systems and in legacy designs where 5V tolerance and PIC instruction-set familiarity are required. When designing with this device, ensure decoupling capacitors are placed close to VDD/VSS pins and that the oscillator layout follows Microchip AN588 guidelines. Industrial-grade parts require a clean analog supply for ADC accuracy, so route AVSS and AGND traces separately from noisy digital returns. This page synthesizes distributor pricing, drop-in PLCC-44 alternatives, and practical design notes not found in the manufacturer datasheet alone, providing engineers with a single consolidated reference for sourcing and qualifying the PIC16LC65BT-04I/L in production.

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PIC16LC65BT-04I/PQ - 8-Bit 7KB MCU 44-MQFP | Microchip
PIC16LC65BT-04I/PQ

PIC16LC65BT-04I/PQ - 8-Bit 7KB MCU 44-MQFP | Microchip

The Microchip Technology PIC16LC65BT-04I/PQ is an 8-bit CMOS microcontroller from the PIC16CXX mid-range family, delivering 4 MHz CPU performance with 7 KB (4K x 14) of One-Time-Programmable (OTP) program memory and 192 bytes of RAM, housed in a 44-pin MQFP (10x10 mm) surface-mount package. It operates from a 2.5 V to 5.5 V supply, supports 33 digital I/O lines, and integrates Timer0 (8-bit), Timer1 (16-bit, sleep-increment capable), and Timer2 peripherals alongside an on-chip Analog-to-Digital Converter. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral interfaces. Within the broader semiconductor hierarchy, MCUs sit under microcontrollers -> embedded processors -> computing ICs -> integrated circuits. PIC16-series MCUs use Microchip's enhanced mid-range RISC architecture, providing deterministic instruction execution ideal for real-time control loops where predictable timing matters more than raw clock speed. Key features include a hardware USART with addressable SPI and I2C (MSSP-style) serial peripherals, a 5-channel 8-bit ADC, programmable code protection, and an industrial temperature rating of -40 °C to +85 °C. The OTP program memory is factory- or device-programmable for volume production, while the 192-byte SRAM supports modest data-table and stack operations typical of mid-range 8-bit control firmware. Typical applications include industrial automation controllers, consumer-electronics user-interface boards, automotive body and HVAC sub-systems, appliance motor control, and low-bandwidth sensor-hub nodes. The wide 2.5 V–5.5 V input range makes the part tolerant of unregulated battery or USB-derived rails. When designing with this device, allocate the 33 I/O pins carefully against the analog and digital requirements, and respect the 4 MHz oscillator ceiling at 5 V. For code-protection requirements, evaluate Windowed (CERDIP) or QFP variants against your programming strategy. This page synthesizes distributor availability, drop-in alternatives, and practical design notes not collected on the manufacturer datasheet.

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PIC16LC65BT-04I/PT - 8-Bit 4MHz MCU 7KB OTP 44-TQFP | Microchip
PIC16LC65BT-04I/PT

PIC16LC65BT-04I/PT - 8-Bit 4MHz MCU 7KB OTP 44-TQFP | Microchip

The Microchip Technology PIC16LC65BT-04I/PT is an 8-bit RISC CMOS microcontroller from the PIC16CXX mid-range family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of data RAM, and 33 digital I/O pins in a 44-pin TQFP (10x10 mm) package. It operates from a 2.5V to 5.5V supply, runs at up to 4 MHz clock speed, and supports I2C, SPI, and UART/USART serial communication peripherals. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals on one die. The PIC16LC65B sits inside the PIC16 mid-range architecture (8-bit RISC, 14-bit instruction word), which historically positioned it between the baseline PIC10/12/16 families and the PIC18 high-tier 8-bit family. The "LC" suffix designates the low-voltage CMOS process node, enabling operation down to 2.5V - lower than the standard PIC16C parts - which is critical for battery-powered designs where the regulator dropout is a key concern. Key features include 8-bit Timer0 with 8-bit prescaler, 16-bit Timer1 (increments during Sleep via external crystal/clock), 8-bit Timer2, a 13-bit programmable Watchdog Timer with on-chip RC oscillator for reliable recovery, a 10-bit multi-channel Analog-to-Digital Converter, and parallel slave port. The mid-range core executes most instructions in a single 200 ns instruction cycle (at 20 MHz) or 1 us cycle (at 4 MHz), providing deterministic interrupt latency suitable for closed-loop control. The device's CMOS fully-static design allows the clock to be stopped and the part to enter Sleep mode with sub-microamp current consumption, making it suitable for energy-harvesting and battery-backed applications. The integrated Brown-out Reset (BOR), Power-on Reset (POR), and Watchdog Timer combine to give industrial-grade reliability for unattended installations. Typical applications include industrial automation sensors and motor-control front-ends, automotive body electronics (climate, lighting, instrument clusters), consumer appliance control boards, smart metering, and low-cost embedded user interfaces. The wide 2.5V-5.5V supply range also supports direct 3.3V or 5V rail connection without level shifters. When designing with this MCU, note that the "I" suffix denotes the industrial temperature grade (-40C to +85C) and the "/PT" suffix identifies the TQFP-44 surface-mount package. The OTP memory limits reprogrammability - use the windowed CERDIP variants (suffix /JW) for prototype development and then transition to the OTP /PT or /PQ package for production.

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PIC16LC66-04/SO - 8-Bit 4MHz MCU, 14KB OTP, 28-SOIC | Microchip
PIC16LC66-04/SO

PIC16LC66-04/SO - 8-Bit 4MHz MCU, 14KB OTP, 28-SOIC | Microchip

The Microchip Technology PIC16LC66-04/SO is an 8-bit RISC microcontroller from the PIC16C family, featuring 14KB (8K x 14) of One-Time-Programmable (OTP) program memory, 368 bytes of RAM, and 22 I/O pins in a 28-pin SOIC package. It operates at a 4MHz instruction clock from a 2.5V to 6V supply, delivering 200ns instruction execution across 35 single-word instructions. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, and configurable peripherals. The PIC16C family uses a Harvard RISC architecture that separates program and data buses, enabling simultaneous instruction fetch and data access. Within the broader taxonomy, the PIC16LC66 is a mid-range 8-bit MCU falling under the power-managed LC sub-family, sitting between basic PIC12/PIC14 devices and higher-pin PIC17/PIC18 parts. Key features include on-chip peripherals for I2C (Master/Slave SPI-compatible), SPI, and UART/USART connectivity; capture/compare/PWM (CCP) modules for timing-critical control; an 8-channel 8-bit A/D converter for analog sensor interfacing; and a watchdog timer plus power-on reset for reliable standalone operation. The 'LC' suffix indicates the low-voltage CMOS process node, allowing operation down to 2.5V for battery-powered designs. The 28-SOIC (0.295-inch / 7.50mm body width) package uses gull-wing leads and surface-mount construction, suitable for hand-soldering, reflow, and standard pick-and-place assembly. Commercial temperature grade (0C to +70C) targets consumer and industrial embedded systems rather than automotive. The OTP program memory is factory- or field-programmable once, with no in-circuit reprogramming, which differentiates this part from Flash-based PIC16F siblings. Typical applications include industrial control panels, sensor interfaces, low-power remote controls, appliance control boards, and battery-operated data loggers. When designing with this device, ensure the oscillator selection (RC, XT, HS, LP) matches the 4MHz instruction rate, and verify the maximum I/O source/sink current of 25mA per pin to prevent port damage.

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