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PIC16LC64A-04/P - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
PIC16LC64A-04/P

PIC16LC64A-04/P - 8-Bit 4MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16LC64A-04/P is an 8-bit CMOS RISC microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins, housed in a 40-pin PDIP (0.600 inch, 15.24 mm) through-hole package. It operates at a maximum clock speed of 4 MHz with the -04 speed grade suffix and runs from a 3.0V to 5.5V supply. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable I/O peripherals on one IC. The PIC16CXX family sits in the 8-bit MCU hierarchy (8-bit CPU -> RISC architecture -> Harvard architecture -> microcontroller -> embedded processor) and is engineered for low-cost, deterministic real-time control with only 35 single-word instructions. The PIC16LC64A-04/P is the low-power ('LC') CMOS variant, ideal for battery and energy-conscious designs. Key features include 35 single-word RISC instructions, single-cycle execution except for two-cycle program branches, fully static design (DC to 4 MHz clock input at this speed grade), 128 bytes of data RAM, 33 digital I/O lines, and a wide operating voltage range. The device supports commercial, industrial, and extended temperature grades in the family, with the -04/P variant typically rated for 0C to +70C commercial range. Architecturally, the PIC16C64A uses a Harvard bus topology with separate program and data paths, a 14-bit instruction word, and an 8-bit data path. The OTP program memory (EPROM-based, windowless) allows one-time field programming using standard device programmers, while the 128-byte RAM provides data scratch space for stack and variables. Watchdog timer, Power-on Reset, and brown-out protection peripherals are integrated on-chip. Typical applications include industrial control logic, appliance controllers, automotive body electronics (non-safety), sensor signal conditioning front-ends, simple user-interface boards, and low-power embedded instrumentation. The 33 I/O count and 4 MHz throughput make it suitable for moderate-complexity tasks such as keypad scanning, LED multiplexing, and UART-based communication. When designing with this MCU, account for the 4 MHz speed grade when calculating instruction cycle time (1 us per instruction at 4 MHz). Verify the erase window requirement if you migrate to the JW package variant, and ensure your programmer supports the PIC16C64A OTP device ID. The -04/P variant is the through-hole PDIP version - surface-mount alternatives exist in SOIC and PLCC packages within the same family. This page synthesizes distributor pricing, Microchip cross-reference alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16LC64A-04/PQ - 4MHz 8-bit OTP MCU, 3.5KB, 33 I/O | Microchip
PIC16LC64A-04/PQ

PIC16LC64A-04/PQ - 4MHz 8-bit OTP MCU, 3.5KB, 33 I/O | Microchip

The Microchip Technology PIC16LC64A-04/PQ is an 8-bit CMOS RISC microcontroller featuring 3.5KB (2K x 14) OTP program memory, 128 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin MQFP (PQ) package. It executes instructions at a maximum clock rate of 4 MHz and operates from a supply voltage of 3.0 V to 5.5 V, integrating brown-out detect, power-on reset, PWM, watchdog timer, and I2C/SPI connectivity on-chip. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, ROM/Flash program memory, RAM, and peripherals such as timers, ADC, and communication interfaces. Within the broader taxonomy, the PIC16LC64A belongs to the PIC16 family -> 8-bit PIC microcontrollers -> microcontrollers -> embedded processors -> semiconductors. The 'LC' prefix denotes the low-power CMOS process variant, while the 'C' suffix historically marked the OTP (One-Time-Programmable) EPROM-based core that preceded Flash PICs. PIC16C/LC devices were widely deployed in the late 1990s and early 2000s in appliances, automotive body modules, and industrial control. Key features include a RISC instruction set with only 35 single-word instructions (most single-cycle, branches two-cycle), 8-bit ALU, four interrupt sources, two 8-bit timers and one 16-bit timer/counter, and a 10-bit ADC (per datasheet family). Peripherals such as the USART, PSP (parallel slave port), and capture/compare/PWM modules make the PIC16LC64A suitable for mixed-signal embedded designs. The MQFP-44 (PQ) surface-mount package provides ample pin count for parallel bus expansion in legacy embedded systems. Typical applications include industrial control panels, HVAC thermostats, automotive body electronics, consumer appliances, and legacy remote sensor/actuator nodes. The wide 3.0-5.5 V supply range allows direct connection to 5 V logic rails used in many industrial installations, while brown-out detect and watchdog timer add reliability for unattended deployments. When designing with this device, account for the OTP memory constraint - code cannot be field-updated - and verify the 4 MHz maximum clock speed against timing requirements. Consider migrating to a Flash-based PIC16F or PIC18 successor for new designs.

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PIC16LC64A-04/PT - 8-Bit 4MHz MCU 3.5KB OTP 44-TQFP | Microchip
PIC16LC64A-04/PT

PIC16LC64A-04/PT - 8-Bit 4MHz MCU 3.5KB OTP 44-TQFP | Microchip

The Microchip Technology PIC16LC64A-04/PT is an 8-bit RISC microcontroller from the PIC16C family, housed in a 44-pin TQFP (PT) surface-mount package. It integrates 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 33 digital I/O pins. The core runs at up to 4MHz and the part carries the conventional PIC16C architecture with an internal RISC core and the listed 14-bit instruction word. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and a range of peripherals. The PIC16C family specifically targets low-cost, high-performance, fully-static 8-bit applications. The LC suffix indicates a low-power CMOS variant typically rated for 3.0V-6.0V operation, while the F suffix indicates flash. The PIC16LC64A belongs to the PIC16C mid-range sub-family, and it sits within the broader hierarchy: microcontroller -> embedded processor -> semiconductor -> integrated circuit. Key features include 33 I/O lines, an 8-bit timer/counter with 8-bit prescaler, a Watchdog Timer with its own on-chip RC, an internal oscillator option on selected parts, and synchronous/asynchronous serial port (SSP/SCI) peripherals. The LC64A is built on a fully-static CMOS process, meaning the clock can be stopped without losing internal state. Maximum supply voltage is 6V and the device supports parallel slave port for external bus interfacing, plus a capture/compare/PWM (CCP) module. Typical applications include industrial control front-ends, automotive body controllers, sensor signal conditioning, low-power remote sensor nodes, and consumer appliance interfaces. The PT (TQFP) package is suitable for space-constrained SMD designs where 33+ I/O lines are required, especially when the application needs parallel bus expansion. Designers should note the 4MHz speed grade; if higher MIPS are needed, upgrade to a -20 or -I suffix variant. Also note the OTP memory - firmware must be finalized before production, since OTP cannot be erased. For prototypes consider the JW or QFP windowed package, or the flash-based PIC16F family. The TQFP package requires standard surface-mount reflow and a PCB with adequate thermal copper for the die. This page consolidates distributor inventory, drop-in alternatives, and engineering design notes not assembled in the manufacturer datasheet alone - enabling faster sourcing decisions and side-by-side replacement analysis for engineers working with legacy PIC16C designs.

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PIC16LC64A-04I/L - 4MHz 8-Bit MCU 3.5KB OTP 44-PLCC | Microchip
PIC16LC64A-04I/L

PIC16LC64A-04I/L - 4MHz 8-Bit MCU 3.5KB OTP 44-PLCC | Microchip

The Microchip Technology PIC16LC64A-04I/L is a low-power, high-performance 8-bit CMOS microcontroller belonging to the PIC16CXX family, built using fully-static EPROM/ROM technology. It integrates 3.5KB of One-Time Programmable (OTP) program memory (2K x 14 words), 128 bytes of RAM, 33 digital I/O lines, and operates at speeds up to 4 MHz from a 2.5V to 6.0V supply in an industrial -40C to +85C temperature grade, all housed in a 44-pin PLCC (J-lead) surface-mount package measuring 16.59 mm x 16.59 mm. An 8-bit microcontroller (MCU) is a single-chip computer that contains a CPU, program memory, data RAM, and programmable I/O peripherals. The PIC16LC64A belongs to the product-type hierarchy MCU -> microcontroller -> 8-bit microcontroller -> embedded controller -> semiconductor. Its RISC instruction set uses only 35 single-word instructions with most executing in a single instruction cycle, providing deterministic timing for control loops. The wide operating voltage range allows operation directly from a 3.3V or 5V rail, and the low-power consumption (5 mA typical active at 5V/4 MHz) makes the part suitable for battery-backed or energy-conscious designs. The PIC16LC64A features a Harvard architecture with separate 14-bit program and 8-bit data buses, a 13-bit program counter capable of addressing 8K x 14 words of program memory, an 8-level hardware stack, and an integrated watchdog timer. Its built-in peripherals in this 'LC' low-power CMOS variant include timers, an analog comparator, and synchronous serial port (SSP) capability (SPI / I2C master mode). With internal RC oscillator support and power-on reset, the device can boot and run with a minimum of external components. The 44-pin PLCC (J-Lead) package provides through-hole-compatible socket assembly while still being surface-mountable on the PCB, easing prototyping and field replacement. Although the OTP ('C') program-memory version is one-time programmable, it is widely used in low-to-mid volume commercial and industrial products where code lock-in is acceptable and tooling cost for masked-ROM parts is not justified. The 'I' industrial temperature grade and 'L' PLCC package suffix are key ordering codes. Typical applications include general-purpose embedded control (appliances, HVAC, instrumentation), human-machine interface front panels, motor-driver sequencers, sensor-signal processing front-ends, RS-232/RS-485 protocol converters, and battery-powered industrial sensors. Its 33 I/O pins allow direct drive of keypads, LED arrays, and small graphic LCDs without external expanders. When designing with PIC16LC64A-04I/L, ensure that the in-circuit serial programming (ICSP) header is accessible because OTP programming must occur after PCB assembly. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the supply pin, and reserve a MCLR pull-up to VDD through 10 kohm if in-circuit programming is required. This page synthesizes current distributor stock, drop-in PIC16LC6X alternatives, and practical design notes that complement the Microchip datasheet and device errata for legacy PIC16C6X designs.

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PIC16LC64A-04I/P - 8-Bit 4MHz 3.5KB OTP MCU 40-PDIP | Microchip
PIC16LC64A-04I/P

PIC16LC64A-04I/P - 8-Bit 4MHz 3.5KB OTP MCU 40-PDIP | Microchip

The Microchip Technology PIC16LC64A-04I/P is an 8-bit CMOS RISC microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 4 MHz maximum operating frequency, and a 40-pin PDIP (Plastic DIP) through-hole package. It belongs to the low-power LC variant supporting 3.0V to 5.5V operation and offers 22 I/O pins for general-purpose interfacing. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and peripheral interfaces onto one die. MCUs sit at the lowest tier of embedded compute - below microprocessors (which need external memory) and embedded SoCs - and dominate applications where deterministic real-time control, low power, and low cost matter more than raw throughput. The PIC16C family uses a Harvard RISC architecture with a fixed 14-bit instruction word, only 35 single-word instructions, and single-cycle execution (program branches take two cycles), giving a 4 MHz oscillator up to 1 MIPS of predictable throughput. Key features of the PIC16LC64A-04I/P include 128 bytes of RAM, an integrated analog comparator, a Watchdog Timer with on-chip RC oscillator, power-saving Sleep mode, in-circuit serial programming capability via two pins, and a programmable code-protection mechanism. The OTP program memory allows one-time field programming, making the part suited for production volumes where firmware is stable and flash reprogrammability is not required. Architecturally, the device uses an enhanced PIC16C6X core with separate program and data buses, a 13-bit program counter capable of addressing 8K x 14 of program space, and a file-register architecture of 128 x 8 general-purpose RAM plus special-function registers. The 22 I/O pins are arranged in ports A (6), B (8), C (8) for digital I/O, with several pins multiplexed to peripherals such as the USART (SCI/SPI), timers, and the analog comparator. Typical applications include low-cost industrial control subsystems, appliance controllers, automotive body electronics (non-safety), sensor signal conditioning front-ends, and legacy embedded products still in service. Its wide 3.0V to 5.5V operating range, low-power consumption (15 uA typical at 5V/4 MHz, 1 uA typical at 3V/32 kHz), and OTP memory make it well-suited for sealed, high-volume, cost-sensitive designs. A primary design consideration when using OTP is that firmware bugs cannot be patched in the field. Engineers should prototype on a windowed CERDIP variant (PIC16C64A-04I/P) or a Flash sibling (PIC16F64A family) before committing to OTP for production. This page synthesizes distributor pricing, OTP vs Flash sibling variants, and design considerations for the PIC16LC64A-04I/P beyond the manufacturer datasheet.

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PIC16LC64A-04I/PQ - 8-Bit 4MHz MCU, 3.5KB OTP, 44-MQFP | Microchip
PIC16LC64A-04I/PQ

PIC16LC64A-04I/PQ - 8-Bit 4MHz MCU, 3.5KB OTP, 44-MQFP | Microchip

The Microchip Technology PIC16LC64A-04I/PQ is an 8-bit CMOS RISC microcontroller from the PIC16C family, featuring a 4 MHz maximum clock, 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of on-chip data RAM, and 33 digital I/O pins, all housed in a 44-pin MQFP (10x10 mm) surface-mount package. A PIC (Peripheral Interface Controller) microcontroller is a class of compact, Harvard-architecture microcontrollers built around a small RISC instruction set with integrated program memory, data RAM, and peripherals on a single die. PIC microcontrollers sit within the broader hierarchy of microcontrollers -> embedded microcontrollers -> semiconductors, and the PIC16 family specifically targets mid-range 8-bit applications requiring more I/O and peripheral mix than entry-level PIC10/12 devices. The 'LC' suffix indicates a low-voltage CMOS variant (typically 3.0V to 5.5V operation) optimized for reduced power consumption, while the 'A' revision denotes an enhanced silicon revision over the original PIC16C64. Key features include an 8-level hardware stack, 14-bit wide instruction word, 8-bit data path, an integrated 8-bit timer/counter (TMR0), a 16-bit timer/counter (TMR1), a 8-bit timer with PWM (TMR2), a USART/SCI serial port, an SPI/I2C compatible Synchronous Serial Port (SSP), a 10-bit multi-channel Analog-to-Digital Converter (ADC), and on-chip brown-out reset and power-on reset circuitry. The 33 I/O lines can source/sink up to 25 mA per pin, enabling direct LED and small-solenoid drive without buffering. The PIC16LC64A uses a two-stage pipeline RISC architecture with 35 single-word instructions, most executing in a single instruction cycle (4 oscillator clocks). At 4 MHz clock the instruction cycle is 1 microsecond, yielding roughly 5 MIPS per MHz sustained throughput. This deterministic instruction-cycle timing simplifies real-time control loops in encoder or motor-control firmware. The 4 MHz oscillator rating reflects the '-04' speed grade; the internal oscillator is not used in the 44-MQFP variant - the part expects an external crystal, resonator, or RC clock source up to 25 MHz when operated at extended VDD. Typical applications include industrial control panels, HVAC damper/valve actuators, appliance user-interface boards, automotive body controllers (non-AEC-Q100), instrumentation front ends, and embedded remote-sensor nodes. The 33 I/O and 10-bit ADC are well-matched to keypad scan plus analog signal acquisition tasks, while the USART enables wired RS-232/RS-485 host links. The low-voltage 'LC' silicon is particularly suited to battery-backed or 3.3V-powered designs that still need PIC16 mid-range peripheral richness. When designing with this part, allocate one of the four oscillator pins correctly for the crystal/RC network and ensure the MCLR pin is tied to VDD through the recommended 10 kOhm pull-up or driven by the system reset supervisor. The OTP memory cannot be erased - choose the PIC16F64 or PIC16LF1847 Flash variant if you need in-system re-programmability during prototyping. This page synthesizes distributor pricing, parametric comparison with same-package PIC16 variants, and practical design notes not consolidated on the manufacturer datasheet, helping engineers evaluate the PIC16LC64A-04I/PQ for new designs and direct cross-reference searches.

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PIC16LC64A-04I/PT - 8-Bit 4MHz MCU 3.5KB OTP 44-TQFP | Microchip
PIC16LC64A-04I/PT

PIC16LC64A-04I/PT - 8-Bit 4MHz MCU 3.5KB OTP 44-TQFP | Microchip

The Microchip Technology PIC16LC64A-04I/PT is a low-power CMOS 8-bit microcontroller from the PIC16C family, delivering 4 MHz maximum clock speed with 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory and 128 bytes of RAM in a 44-pin TQFP package. It exposes 33 digital I/O lines and integrates I2C and SPI connectivity peripherals, plus a 10-bit analog-to-digital converter for mixed-signal embedded designs. A PIC microcontroller is a compact computer-on-a-chip based on a RISC (Reduced Instruction Set Computer) Harvard architecture, integrating CPU core, non-volatile program memory, working RAM, peripherals, and I/O into a single IC. Within the embedded hierarchy, PIC16C sits between baseline PIC10/PIC12 8-pin controllers and PIC18/PIC24 16-bit devices, targeting mid-range control tasks that need more code space and I/O than entry-level MCUs. The PIC16C6X family uses OTP program memory rather than Flash, which keeps die cost low but requires mask-programmed or windowed devices for volume production and limited in-circuit reprogrammability. Key differentiating specifications include 4 MHz maximum operating frequency, 35 single-word instructions with single-cycle execution (except program branches), 8-bit-wide data path, and an industrial-grade -40C to +85C operating temperature range as denoted by the 'I' suffix. The 128-byte RAM and 33 I/O pins enable rich sensor interfacing, while I2C/SPI connectivity supports peripheral expansion. The '04' speed grade limits the oscillator to 4 MHz, suiting low-EMI, deterministic control loops. Architecture-wise, the PIC16C6X core uses a 14-bit instruction word with separate program and data buses (Harvard), enabling simultaneous fetch and access. The device supports DC to 4 MHz clock input across 2.5V-5.5V supply, with internal brown-out reset, watchdog timer, and power-on reset. The 10-bit ADC multiplexes across multiple channels, sharing pins with digital I/O. Typical applications include industrial automation controllers, white-goods user interfaces, motor-control front-ends, automotive body electronics (non-safety), HVAC thermostat logic, and battery-powered sensor hubs. The 33 I/O and 3.5 KB OTP make it well-suited for fixed-function appliances where the firmware is finalized before mask programming. Design consideration: OTP memory cannot be field-updated, so provisioning firmware-update paths requires either mask ROM equivalents or migrating to a Flash-based PIC16F7x pin-compatible successor. Plan for socketed prototypes during firmware bring-up. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16LC64AT-04/L - 8-Bit 4MHz OTP MCU, 3.5KB | Microchip
PIC16LC64AT-04/L

PIC16LC64AT-04/L - 8-Bit 4MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16LC64AT-04/L is an 8-bit RISC microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and a maximum clock speed of 4 MHz, housed in a 44-pin PLCC package measuring 16.59 x 16.59 mm. The "LC" suffix denotes the low-voltage CMOS variant supporting 3.0V to 5.5V operation, while the "T" indicates tape-and-reel packaging and "-04" specifies the 4 MHz speed grade. The device integrates 33 digital I/O lines, a 5-channel 8-bit ADC, two 8-bit timers and one 16-bit timer, plus a Watchdog Timer, Brown-out Reset, and Power-on Reset. Communication peripherals include I2C (Master/Slave) and SPI (Master/Slave) interfaces, with PWM, capture, and compare modules also available. What is a PIC16C microcontroller? PIC16C is a family of low-cost, high-performance, CMOS, fully-static 8-bit microcontrollers from Microchip Technology built on a Harvard RISC architecture. Within the broader taxonomy, PIC16C sits below PIC18/PIC24 as a mid-tier 8-bit MCU, which itself belongs to the microcontroller (MCU) class of integrated circuits, then to embedded processors, and finally to the broader semiconductor device category. The PIC16C series uses a RISC instruction set of only 35 single-word instructions, where all instructions execute in a single cycle except program branches which take two cycles. The LC sub-family specifically targets battery-powered and low-voltage applications where 3.3V rails are common, distinguishing it from the standard PIC16C64A which requires 4.0V minimum. Key features include 2K x 14 (3.5KB) OTP program memory that can be written only once, a programmable code protection mechanism, an in-circuit serial programming (ICSP) interface, and a power-saving SLEEP mode. The PIC16C64A core provides eight hardware interrupt sources and a four-deep hardware stack. The LC variant typically draws less than 5 mA active current at 5V and under 20 µA in SLEEP, making it well-suited to mains-powered and battery-backed industrial control applications. Operating temperature ranges from -40 °C to +85 °C for the industrial grade. Architecturally, the PIC16LC64A uses a 14-bit-wide instruction word with an 8-bit-wide data path, allowing most operations to complete in a single instruction cycle (200 ns at 20 MHz external oscillator). The integrated ADC has 8 channels with 8-bit resolution and supports both single-ended and differential conversions. The PIC16LC64A also includes a USART for asynchronous serial communication, distinguishing it from the older PIC16C64 which lacks this peripheral. Typical applications include industrial control systems, appliance controllers, automotive body electronics, smart sensor interfaces, and low-power remote sensor nodes. The wide operating voltage (3.0V to 5.5V) and 22+ I/O pins make it suitable for moderate-complexity embedded designs. When migrating from PIC16C64A designs, note that the LC variant operates down to 3.0V but otherwise shares the same peripherals and pinout. Designers should consult the Microchip PIC16C6X datasheet (DS30262D family) for full peripheral specifications. For design, ensure decoupling capacitors of 0.1 µF are placed within 5 mm of each VDD/VSS pair. A series resistor on MCLR is recommended when using ICSP to limit inrush current. The OTP memory means firmware revisions require physical part replacement; for development, use a JW (windowed) or F (Flash) variant. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone.

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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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