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PIC16LC620AT-04I/SO

PIC16LC620AT-04I/SO - 8-Bit 4MHz OTP MCU, 896B | Microchip

The Microchip Technology PIC16LC620AT-04I/SO is an 8-bit RISC PIC® 16C-family microcontroller featuring 896 bytes (512 x 14 words) of One-Time Programmable (OTP) program memory, 96 bytes of RAM, and a maximum clock speed of 4 MHz, housed in an 18-pin SOIC (SO-18) package. It operates from a 2.5 V to 6.25 V supply, offers 13 digital I/O lines, and is specified over the automotive -40 °C to +85 °C industrial operating range. The 'T' suffix indicates tape-and-reel packaging, the '04' denotes the 4 MHz speed grade, the 'I' indicates the industrial temperature range, and the '/SO' suffix specifies the 0.300-inch wide SOIC-18 package. A PIC microcontroller (MCU) is a compact programmable processor built around a Harvard-architecture RISC core with separate program and data buses. Within the broader taxonomy, this part sits in the PIC16C mid-range family, between the 8-bit PIC10/12/16 baseline parts and the higher-end 16-bit dsPIC/PIC24 families. PIC MCUs integrate CPU core, non-volatile program memory (here OTP), volatile RAM, EEPROM data memory on some variants, timers, an ADC, comparators, and digital I/O into a single chip, eliminating external memory and most glue logic in small embedded designs. Key features include a 14-bit instruction word with 8-bit data path, two-level deep hardware stack, seven special-function hardware registers, direct/indirect/relative addressing modes, and on-chip peripherals suitable for simple control loops, sensor interfacing, and human-machine interface tasks. The PIC16C620A core provides deterministic instruction timing - every instruction executes in one oscillator cycle after the fetch - which simplifies real-time scheduling. The integrated brown-out reset, watchdog timer, and power-on reset reduce external component count in cost-sensitive designs. The architecture uses a RISC core with 35 single-word instructions, allowing most operations to complete in a single instruction cycle at 4 MHz (250 ns cycle time). The internal oscillator option and wide voltage range support battery-powered and automotive environments, while the OTP program memory enables low-cost prototyping before committing to a masked-ROM version for high-volume production. Compared with Flash-based PIC16F equivalents, OTP parts offer lower per-unit cost in mature, code-stable products. Typical applications include automotive body controllers, sensor signal conditioning, simple PWM-driven LED or motor control loops, IR remote control transmitters and receivers, and consumer appliance user-interface boards. The 18-pin SOIC footprint is convenient for hand-soldered prototypes and short-run production. When designing with this device, ensure your code-development toolchain supports OTP programming (MPLAB X with a compatible programmer such as PICkit) and that you verify OTP one-time-programming limits during validation. For new designs, weigh the OTP cost advantage against the field-upgrade convenience of Flash-based PIC16F parts. This page synthesizes distributor pricing, pin-compatible drop-in alternatives from Microchip's PIC16 family, lifecycle status, and practical design notes not found in the bare manufacturer datasheet.

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PIC16LC620AT-04I/SS

PIC16LC620AT-04I/SS - 8-bit OTP MCU 4MHz 13 I/O | Microchip

The Microchip Technology PIC16LC620AT-04I/SS is an 8-bit CMOS OTP-based PIC microcontroller delivering 4 MHz CPU performance with 13 I/O pins in a 20-pin SSOP package. It integrates 896 bytes (512 x 14) of one-time-programmable program memory and 96 bytes of SRAM, targeting cost-sensitive embedded applications. The device operates across a 2.5V to 6.25V supply range and is qualified for the industrial -40C to +85C operating range. A PIC microcontroller (Programmable Intelligent Computer) is a compact microcontroller architecture featuring a RISC-style Harvard design with separate program and data buses, allowing simultaneous instruction fetch and data access. PIC MCUs sit in the broader taxonomy of microcontrollers -> microprocessors -> embedded computing -> semiconductors. They are valued for deterministic instruction timing, low power consumption, and a simplified instruction set that enables compact code density, making them ubiquitous in industrial control, automotive body electronics, and consumer appliance markets. Key features include a 12-bit wide instruction set with an 8-bit data path, seven or eight special function hardware registers, a two-level deep hardware stack, and direct/indirect/relative addressing modes. The 04 speed grade specifies 4 MHz maximum oscillator frequency, optimized for low-power or battery-operated designs. The device also includes a watchdog timer, power-on reset, and brown-out detection circuitry for robust field operation. The architecture leverages CMOS fabrication with OTP program memory, balancing unit-cost optimization against reprogrammability. Designers can prototype on flash-based PIC16F equivalents and migrate to the OTP-based PIC16LC620A for production cost reduction. Internal oscillator options and low-power SLEEP mode support energy-conscious applications, while peripheral I/O includes digital I/O with individual direction control. Typical applications include automotive body controllers, remote keyless entry transmitters, security system sensors, low-end consumer appliances, sensor signal conditioning, and small industrial control modules. The wide voltage tolerance makes it well suited to 3.3V or 5V regulated rails in distributed embedded networks. Compared with 8-bit AVR alternatives, the PIC16LC620A offers a more mature toolchain and broader third-party library support. When designing with this part, ensure the chosen programming tool supports OTP devices - OTP parts are one-time-programmable and cannot be re-flashed during development. The 20-pin SSOP footprint also requires careful PCB land pattern design and 0.65 mm pitch trace routing to maintain manufacturing yield at high volumes. This page synthesizes distributor pricing, drop-in same-package alternatives, application guidance, and design notes not found in the manufacturer datasheet alone, providing a single authoritative reference for component selection.

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PIC16LC620T-04/SO

PIC16LC620T-04/SO - 4MHz 8-Bit OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16LC620T-04/SO is an 8-bit RISC microcontroller from the PIC16C family, featuring a 4 MHz maximum clock speed, 896 bytes of One-Time Programmable (OTP) program memory (organized as 512 x 14 words), and a 12-bit instruction word with 8-bit data path, packaged in an 18-lead SOIC (Small Outline IC, 0.300 inch body width). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data RAM, and peripheral interfaces on one silicon die. Within the semiconductor hierarchy, MCUs sit inside the broader category of microprocessors and embedded controllers, and the PIC16LC620 belongs specifically to Microchip's PIC16 mid-range family - one of the industry's most widely deployed 8-bit architectures. The 'LC' suffix indicates the low-voltage CMOS process variant optimized for 2.5V-6.25V operation, drawing less current than the standard 'C' parts while supporting battery-powered and portable designs. Key features include a 4 MHz oscillator, 13 general-purpose I/O pins, a two-level deep hardware stack, and seven or eight special function registers. The PIC16C core uses a RISC instruction set with only 35 single-word instructions, most executing in a single instruction cycle (4 oscillator clocks), giving an effective 1 MIPS throughput at 4 MHz. Addressing modes include direct, indirect, and relative, with on-chip peripherals including a comparator, 8-bit timer/counter, and watchdog timer. Typical applications include low-cost consumer appliances, automotive body electronics, industrial control subsystems, sensor signal conditioning, and legacy embedded products that require a stable, mature 8-bit MCU with mask-ROM-style code protection. The wide 2.5V-6.25V supply range allows direct operation from a 3.3V regulated rail or a multi-cell battery pack. When designing with this device, note that OTP memory can be programmed only once - for prototyping use PIC16LC620-04/SO (windowed EPROM) or the flash-based PIC16F628 successor. The 'T' suffix indicates tape-and-reel packaging for high-volume SMT assembly, and the '04' speed grade specifies the 4 MHz maximum clock. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet, helping engineers and procurement teams evaluate sourcing options for legacy PIC16 designs.

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PIC16LC620T-04E/SO

PIC16LC620T-04E/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16LC620T-04E/SO is an 8-bit PIC16 microcontroller with 4 MHz CPU clock, 896 bytes (512 x 14) of One-Time Programmable (OTP) program memory, and 12 I/O pins, housed in an 18-pin SOIC package. It operates from a 2.5 V to 6.25 V supply and is rated for the automotive temperature range, making it suited to harsh embedded environments. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripherals such as timers, A/D converters, and communication interfaces. In the broader system hierarchy, the PIC16LC620 belongs to the PIC16C family of RISC microcontrollers, which sits under the 8-bit MCU category, which itself is a subset of embedded microcontrollers and, ultimately, microprocessors and semiconductors. Low-power (LC) variants are optimized for battery-powered applications through reduced core voltage operation. Key features of the PIC16LC620T-04E/SO include a RISC instruction set with 35 single-word instructions, a two-level deep hardware stack, 12-bit-wide instructions and an 8-bit-wide data path, plus seven or eight special-function hardware registers. Brown-out Detect/Reset and Power-on Reset peripherals are integrated, and the device supports direct, indirect, and relative addressing modes for efficient C and assembly development. The architecture employs a Harvard-style memory layout with separate program and data buses, allowing instruction fetch and data access to occur in the same cycle. This delivers deterministic 4 MHz throughput with single-cycle instruction execution, which is critical for real-time control loops. On-chip peripherals such as timers, a comparator, and an internal oscillator reduce external component count. Typical applications include automotive body controllers, sensor conditioning front-ends, low-power remote keyless entry transmitters, industrial control modules, and small appliance control boards. The wide supply range (2.5 V to 6.25 V) allows direct connection to 3.3 V or 5 V rails. When designing with this part, note that OTP memory is one-time programmable and cannot be re-flashed - choose PIC16F variants for in-circuit reprogrammability. Place a 0.1 uF decoupling capacitor adjacent to VDD and keep oscillator traces short. This page synthesizes distributor stock data, drop-in OTP/EPROM alternatives, and practical design notes not consolidated on any single distributor listing.

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PIC16LC620T-04E/SS

PIC16LC620T-04E/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16LC620T-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, operating up to 4 MHz and housed in a 20-pin SSOP package. According to the DigiKey listing (Mfr part 321357), the device integrates 896 bytes (512 x 14) of One-Time Programmable program memory, 80 bytes of RAM, and 12-13 general-purpose I/O pins, with a 14-bit instruction word and 8-bit data path. The "LC" suffix denotes the low-voltage 2.5V-6.25V variant suitable for battery-backed and portable designs, while the "T" indicates tape-and-reel packaging and "04E" specifies the 4 MHz speed grade with the industrial "E" (extended) operating temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals. Within the semiconductor hierarchy, MCUs belong to the embedded computing category; the PIC16C sub-family uses a RISC-style Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and operand access. PIC16C devices run 35 single-cycle instructions and are programmed with a 14-bit instruction word, giving higher code density than typical 8-bit CISC cores. The OTP memory makes these parts one-time programmable, suited for production volumes where reprogrammability is not required. Key features include an internal oscillator option, two 8-bit timers (Timer0 and Timer2) plus one 16-bit Timer1, a 4-channel 8-bit ADC on most PIC16LC620 variants, and a watchdog timer with on-chip RC oscillator for reliable reset behaviour. The device supports in-circuit serial programming via the ICSP interface, reducing manufacturing complexity. The wide 2.5V-6.25V supply range and CMOS process deliver low power consumption suitable for sleep-mode applications. Typical applications include automotive body controllers (non-AEC-Q100 grades), industrial sensor interfaces, low-end consumer appliance control, security keypads, and small motor control. The 20-SSOP footprint also makes it suitable for space-constrained designs where a 20-pin SOIC variant (PIC16LC620T-04E/SO) is too large. When designing with this device, ensure decoupling: place a 100 nF capacitor as close as possible to the VDD pin, and reserve the MCLR pin for a proper reset network. Note that the 'E' temperature suffix typically indicates an extended industrial temperature range suitable for harsher environments. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, and is maintained with active freshness signals as of 2026-09-22.

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PIC16LC620T-04I/SS

PIC16LC620T-04I/SS - 8-bit 4MHz PIC MCU, 896B OTP, 20-SSOP

The Microchip Technology PIC16LC620T-04I/SS is an 8-bit PIC microcontroller built on the PIC16C core, operating at 4 MHz with 896 bytes (512 x 14) of One-Time Programmable (OTP) program memory and 80 bytes of RAM, housed in a 20-pin SSOP (5.30 mm body) surface-mount package. It supports a wide 2.5 V to 6.25 V supply range, draws low current, and provides 12 to 13 general-purpose I/O pins for digital interfaces. The 'LC' prefix designates the low-power CMOS variant of the PIC16C620 family, and the 'T' suffix denotes Tape & Reel packaging for high-volume assembly. This part targets cost-sensitive, deterministic embedded control applications where simplicity, low power, and Microchip's mature PIC toolchain are preferred over higher-performance Cortex-M devices. An OTP microcontroller (One-Time Programmable) is a non-flash, non-EEPROM based MCU whose program memory is written once via a device programmer and cannot be field-updated. OTP parts are widely used in high-volume consumer goods, appliances, and toys where firmware is finalized at production and code changes are unnecessary, because OTP silicon is denser and cheaper per die than flash. The PIC16C core uses a 14-bit instruction word with a RISC-style architecture, a two-level hardware stack, and seven or eight special-function hardware registers, providing deterministic interrupt latency and very small code footprints. Key features include 12 general-purpose I/O pins, brown-out detect (BOD) and power-on reset (POR) for robust cold-start behavior, a watchdog timer (WDT) for runaway-code recovery, and an internal 4 MHz oscillator option that removes the need for an external crystal in many designs. The OTP memory is partitioned as 512 x 14 bits, while the 80-byte RAM supports small data tables and stack operations. Combined, these features make the PIC16LC620T-04I/SS a compact, low-cost control engine. Typical applications include remote controls, white-goods and small-appliance controls, LED drivers, sensor front-ends, battery chargers, and simple sensor hubs. The wide 2.5 V to 6.25 V supply range enables direct operation from 3-cell battery stacks, regulated 5 V rails, or low-dropout (LDO) post-regulation of higher voltage busses. Brown-out reset ensures clean firmware execution even with weak or sagging supplies. When designing with this device, note that the 'I' suffix indicates the industrial -40 C to +85 C operating-temperature grade and the 'T' suffix indicates Tape & Reel. OTP memory cannot be rewritten, so production programming must be planned. Engineers targeting in-system reprogrammability should migrate to a flash-based PIC16F family equivalent (e.g., PIC16F620A-I/SS) that shares the same 20-SSOP footprint.

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PIC16LC621-04/P

PIC16LC621-04/P - 4MHz 8-bit OTP MCU, 1.75KB, 18-DIP | Microchip

The Microchip Technology PIC16LC621-04/P is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, clocked at 4 MHz with a 200 ns instruction cycle, housed in an 18-pin PDIP through-hole package. It integrates 1.75 KB of OTP program memory, 80 bytes of RAM, 13 digital I/O lines, and a 12-bit wide instruction set with an 8-bit data path, targeting low-power embedded control applications. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. Within the broader taxonomy it sits under microprocessor -> microcontroller -> 8-bit MCU -> CMOS RISC MCU. The PIC16LC62x family in particular is part of Microchip's mid-range PIC architecture, which uses a Harvard-style separate program/data bus and a small, deterministic instruction set well-suited to real-time control. The LC (low-power CMOS) suffix indicates the part is optimized for low quiescent current and supports a wide supply range, making it appropriate for battery-powered and industrial systems. Key features include 35 single-cycle instructions (only program branches take two cycles), 12 I/O pins with individual direction control, a two-level deep hardware stack, and support for direct, indirect, and relative addressing modes. The device has seven or eight special function hardware registers and an integrated power-on reset / brown-out detection block (typical for the family). The 'LC' process node enables supply operation from approximately 2.5 V to 6.25 V with reduced active current compared to the standard 'C' EPROM variants. Architecturally the PIC16LC621 uses a RISC core with a fixed 14-bit instruction word and 8-bit data path, giving it deterministic interrupt latency and instruction timing - a key reason these MCUs remain popular in cost-sensitive motor control, sensor conditioning, and appliance designs. The 4 MHz speed grade in this part denotes a maximum oscillator input of 4 MHz, yielding a 200 ns instruction cycle. The OTP (One-Time Programmable) program memory is windowless and intended for production volumes where code is finalized. Typical applications include low-cost white goods control (washing machines, microwave ovens), HVAC fan and damper control, simple sensor interface boards, IR remote receivers, and small appliance key-scan matrices. The wide 2.5-6.25 V supply range also makes it suitable for 3.3 V or 5 V industrial sensor nodes. When designing with this MCU, allocate the 1.75 KB program memory carefully - it accommodates roughly 1K single-word instructions. Because this is an OTP part, code must be fully debugged before programming; use the UV-erasable PIC16C621 windowed variant during development, then move to PIC16LC621-04/P for production. This page synthesizes current distributor pricing, drop-in alternative listings (same-brand first), and practical design notes not aggregated on any single manufacturer or distributor page, providing a single reference for engineers qualifying the PIC16LC621-04/P.

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PIC16LC621-04/SO

PIC16LC621-04/SO - 4MHz 8-Bit CMOS MCU, 1.75KB OTP, 18-SOIC | Microchip

The Microchip Technology PIC16LC621-04/SO is an 8-bit EPROM-based CMOS microcontroller operating at up to 4 MHz, housed in an 18-pin SOIC (SO-18, 0.300-inch) commercial-temperature package. It integrates 1.75 KB of OTP program memory (1K x 14), 80 bytes of RAM, and 13 bidirectional digital I/O pins, with a 2.5V to 6.0V (per LCSC) supply range and a two-level hardware stack supporting RISC-style instructions. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path that fetches, decodes, and executes instructions from on-chip program memory; it sits within the broader hierarchy of microcontroller -> embedded controller -> semiconductor IC -> integrated circuit. The 'LC' prefix in PIC16LC621 indicates a low-power CMOS variant of the PIC16C621 OTP family, optimized for battery and energy-constrained embedded designs while retaining the PIC mid-range instruction set. Key features of the PIC16LC621-04/SO include 12-bit-wide instruction words, an 8-bit-wide data path, seven or eight special-function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes. The device supports internal and external oscillator options typical of the PIC16C62x family, watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and selectable oscillator start-up timer. The architecture uses a Harvard-style RISC design with only 35 single-word instructions, enabling predictable real-time response. The EPROM-based program memory supports one-time-programmable field updates and in-circuit programming via Microchip development tools, while the 80-byte RAM and 13 I/O pins are sufficient for small-signal sensing, switch scanning, and motor or relay driving applications. Typical applications include consumer appliance control, low-end remote controls, sensor signal conditioning, timer/counter-based industrial control, automotive interior modules (sub-systems), and battery-powered portable devices where low quiescent current and the 18-pin SOIC footprint are advantageous. The wide 2.5V-6.0V supply range also enables 3.3V and 5V system designs. When designing with the PIC16LC621-04/SO, note that OTP memory is one-time programmable - firmware revisions require new parts. For field-upgradeable designs consider PIC16F62x flash variants. Always reserve the MCLR/VPP pin for in-circuit serial programming and decoupling the VDD/VSS pair with 100 nF ceramic capacitors placed within 5 mm of the package pins. This page synthesizes distributor pricing for 18-SOIC commercial PIC16LC62x variants, drop-in same-package alternatives from the PIC16LC620A/621A family, and practical design notes not collected in a single place in the manufacturer datasheet.

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PIC16LC621-04E/P

PIC16LC621-04E/P - 4MHz 8-bit OTP MCU 1.75KB DIP-18 | Microchip

The Microchip Technology PIC16LC621-04E/P is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C family, operating at 4 MHz with 1.75 KB (1K x 14) of program memory, 80 bytes of RAM, and 13 I/O lines, housed in an 18-pin PDIP through-hole package with automotive temperature grade. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral I/O onto one silicon die. Within the broader hierarchy, an MCU is a type of embedded processor, sitting below microprocessors in computational capability but above discrete logic in functional density. The PIC16C/LC62x family targets cost-sensitive 8-bit embedded applications, providing RISC architecture with a small instruction set (35 instructions) and single-cycle execution (200 ns at 20 MHz). Key features of the PIC16LC621 include 4 MHz maximum clock, 12-bit-wide instructions, 8-bit-wide data path, seven or eight special function hardware registers, and a two-level deep hardware stack. The device supports direct, indirect, and relative addressing modes, and offers 13 bidirectional I/O pins capable of driving segmented LED displays or interfacing to sensors. The architecture uses a Harvard-style separate code and data bus, with 14-bit wide instruction words for compact code density. The low-power 'LC' designation indicates the 2.5V to 6.25V supply voltage range, suiting battery-powered designs. The '04' speed grade caps operation at 4 MHz, and the 'E' suffix denotes the automotive (-40C to +125C) operating temperature range. Typical applications include automotive body controllers, simple sensor interfaces, low-end consumer appliances, LED lighting controllers, and industrial control replacement of discrete logic. The OTP program memory enables rapid prototyping and low-volume production without the tooling cost of mask-ROM devices. When designing with this MCU, ensure the clock source (RC, crystal, or resonator) is placed close to the OSC1/OSC2 pins and that decoupling capacitors (0.1 uF) are placed adjacent to VDD. The MCLR reset pin must be pulled high through a resistor for normal operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for sourcing and engineering decisions.

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PIC16LC621-04E/SO

PIC16LC621-04E/SO - 4MHz 1.75KB OTP 8-bit MCU 18SOIC | Microchip

The Microchip PIC16LC621-04E/SO is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4MHz CPU clock with 1.75KB (1K x 14) OTP program memory and 80 bytes of RAM in an 18-pin SOIC surface-mount package. The part operates from a 2.5V to 6V supply and offers 13 I/O pins plus an external oscillator interface. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable peripherals. The PIC16C/LC family belongs to Microchip's classic baseline PIC16 architecture, which uses a RISC-style Harvard design with 12-bit wide instructions, an 8-bit wide data path, and only 35 single-cycle instructions to learn. This compact instruction set and deterministic execution model are the foundation of the PIC platform used in millions of embedded products. Key features of the PIC16LC621-04E/SO include a 200ns instruction cycle time, seven or eight special-function hardware registers, a two-level deep hardware stack, and three addressing modes (direct, indirect, and relative). The LC designation indicates a low-voltage CMOS process that allows operation down to 2.5V for battery-powered designs. The /SO suffix designates the wide-body 0.300-inch SOIC-18 (300 mil) package for surface-mount assembly. Typical applications span industrial control, automotive body electronics, consumer white goods, and low-power sensor interfaces where cost-sensitive 8-bit processing is sufficient. The 4MHz clock and 1.75KB OTP program memory suit applications such as appliance user-interface controllers, simple motor drivers, and remote sensor transmitters. When designing with this part, note that OTP memory is one-time programmable - firmware must be fully validated before programming, as code cannot be revised. Engineers migrating to flash-based alternatives should consider the PIC16F family, which offers identical peripherals and footprints with in-circuit reprogrammability.

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PIC16LC621-04I/P

PIC16LC621-04I/P - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16LC621-04I/P is an EPROM-based 8-bit CMOS microcontroller from the PIC® 16C family, offering 1.75 KB of OTP program memory (1K x 14 words) and 80 bytes of RAM in an 18-pin PDIP through-hole package. The 'LC' suffix denotes the low-voltage CMOS variant operating from 2.5V to 6.25V supply, with a maximum clock input of 20 MHz (4 MHz at the -04 speed grade) and a 200 ns single-cycle instruction period, except program branches which take two cycles. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. The PIC16C family uses a RISC Harvard architecture with 35 single-cycle instructions, two-level hardware stack, and direct/indirect/relative addressing modes. Within the broader taxonomy, the PIC16LC621 is a low-voltage CMOS variant of the PIC16C62x series, itself a member of the mid-range PIC microcontrollers — a product family positioned between PIC10/12/16 baseline devices and PIC18/24 high-performance parts. Key features of this part include 13 bidirectional I/O pins, 8-bit wide data path, 12-bit wide instructions, 12 I/O ports, integrated timer/counter peripheral, watchdog timer, power-on reset, and seven/eight special function hardware registers. The device supports both RC and crystal oscillator modes and includes an industrial temperature range (-40C to +85C) suitable for factory and outdoor embedded deployments. Typical applications span consumer appliance control, simple sensor interfaces, automotive body electronics (non-AEC-Q100), industrial automation I/O modules, and educational/prototyping platforms where through-hole DIP packages simplify breadboarding and hand soldering. Compared to flash-based PIC16F counterparts, this OTP part requires a UV-erasable window or one-time programming, which favors production volumes over prototyping workflows. When designing with this MCU, note that the -04 speed grade limits clock input to 4 MHz (200 ns instruction cycle), distinguishing it from faster -20 grades at 20 MHz. The 18-pin PDIP footprint (0.300 inch row spacing) supports legacy through-hole PCB designs and IC sockets for in-circuit reprogramming during development. This page synthesizes distributor pricing, verified cross-reference data from Microchip's PIC16 family, and practical design notes not found in the manufacturer datasheet alone. Pinout, package drawing, and complete spec coverage are sourced directly from the Microchip PIC16LC621 datasheet.

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PIC16LC621-04I/SS

PIC16LC621-04I/SS - 4MHz 8-bit OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16LC621-04I/SS is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C62X mid-range family, offering 1.75 KB (1K x 14) of program memory, 80 bytes of RAM, and 13 digital I/O pins in a 20-pin SSOP package. The "LC" prefix indicates a low-power CMOS variant (versus the PIC16C621 EPROM part), the "-04" suffix denotes a 4 MHz maximum clock input (200 ns instruction cycle), and the "I" suffix indicates the industrial operating temperature range of -40C to +85C. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash), data RAM, and peripheral I/O on one die. The PIC16C62X family belongs to Microchip's mid-range architecture, which uses a 14-bit wide instruction word with an 8-bit data path. Within the broader taxonomy, this places the part as: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. The LC62X line targets cost-sensitive embedded control applications requiring a small footprint and very low active/standby power. Key features include 35 single-cycle instructions (all 200 ns except program branches which take two cycles), a two-level deep hardware stack, seven or eight special function hardware registers, and direct/indirect/relative addressing modes. Supply voltage spans 2.5 V to 6.25 V, allowing operation from a single Li-ion cell or a regulated 5 V rail. The 13 I/O pins can each source or sink up to 25 mA, and four of them support wake-up-on-change interrupts. The device also includes a watchdog timer with on-chip RC oscillator, a power-on reset (POR), and a low-power SLEEP mode with multiple wake-up sources. The PIC16LC621 uses a Harvard RISC architecture with separate program and data buses, enabling single-cycle instruction fetch plus execution. An integrated 4 MHz internal oscillator option (selected via configuration bits) eliminates the need for an external crystal in cost-sensitive designs. The OTP program memory supports one-time programming using a standard PIC programmer, which suits low-to-medium volume production runs where mask-ROM NRE is not justified. Typical applications include small appliance controls (coffee makers, blenders, fans), battery chargers, remote-control transmitters, sensor signal conditioning front-ends, LED lighting controllers, and consumer white-goods user-interface boards. The industrial temperature range also opens automotive interior lighting, HVAC damper controls, and 2-way radio accessory ports. Design considerations: always use a 0.1 uF decoupling capacitor within 5 mm of VDD, and place MCLR pull-up (typically 10 kohm) close to the pin to prevent spurious resets. For OTP programming, ensure the ICSP clock/data/Vpp lines are accessible via a header or test points, and verify the configuration bits (oscillator selection, watchdog, code protect, brown-out) before programming. This page synthesizes distributor pricing, drop-in alternative PIC16C62X family variants, and practical design notes not found in the manufacturer datasheet alone.

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PIC16LC621A-04/SO

PIC16LC621A-04/SO - 8-Bit 4MHz OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16LC621A-04/SO is a 4 MHz, 8-bit CMOS RISC microcontroller in the PIC16C family, supplied in an 18-pin SOIC (SO-18, 0.300-inch) package. It integrates 1.75 KB (1K x 14) of One-Time Programmable (OTP) EPROM program memory and 96 bytes of data RAM, paired with a 13-bit instruction word and an 8-bit data path. The device is rated for 2.5 V to 6.25 V operation, suitable for both 3.3 V and 5 V rails. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripherals onto one die. The PIC16C family uses a Harvard RISC architecture that separates program and data buses for single-cycle instruction fetch and deterministic timing, enabling high code density at low clock rates. The PIC16LC621A-04/SO occupies the low-power CMOS "LC" tier within that family, optimized for applications that need OTP-based firmware with low static drain. Key features include 13 bidirectional I/O pins, two 8-bit timers (Timer0 and Timer2-style modules), a Watchdog Timer with its own on-chip RC oscillator, and an analog comparator. A two-level deep hardware stack supports subroutine nesting, and the device supports direct, indirect, and relative addressing. Dual comparator inputs with programmable reference output make this part a frequent choice for simple sensor interfaces and battery-management front-ends. Typical applications include low-cost consumer appliances, automotive body and interior modules (with -I/-E temperature grades available across the family), HVAC sensor interfaces, white-goods control boards, and the analog front-end of a switching power supply. The 18-SOIC footprint also supports through-hole legacy boards adapted to surface-mount assembly. For applications needing the same memory map but with field-reprogrammable Flash, designers typically migrate to the PIC16F627 family, which shares the same pinout. When designing with this device, ensure Vdd decoupling uses a 100 nF ceramic capacitor placed within 5 mm of the package pins, and tie the MCLR pin high through the recommended 10 kohm pull-up to avoid spurious resets. The OTP memory means firmware revisions require a new part - plan for the Flash migration path (PIC16F627A-I/SO) on prototype spins. This page consolidates distributor pricing, drop-in alternatives, and engineering design notes not found in a single manufacturer datasheet, and is intended to accelerate sourcing and BOM validation.

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PIC16LC621A-04/SS

PIC16LC621A-04/SS - 8-Bit 4MHz OTP MCU 1.75KB 20-SSOP | Microchip

The Microchip PIC16LC621A-04/SS is a low-power 8-bit EPROM-based CMOS microcontroller from the PIC16C family, featuring a 4 MHz maximum clock, 1.75 KB (1K x 14) of One-Time-Programmable (OTP) program memory, 96 bytes of RAM, and 13 digital I/O pins, all housed in a 20-pin Shrink Small-Outline (SSOP) package. It operates from a 2.5 V to 5.5 V supply, supports 35 single-cycle instructions (200 ns instruction cycle at 20 MHz except for two-cycle branches), and includes peripherals such as an 8-bit timer, a Watchdog Timer (WDT), Power-On Reset (POR), and Brown-Out Reset (BOR). A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and configurable peripheral interfaces. The PIC16LC621A belongs to the PIC16C mid-range architecture lineage, an 8-bit RISC core family that emphasizes deterministic instruction timing, low power consumption, and a small footprint - making MCUs ideal for embedded control, sensor reading, and actuator driving. As an OTP variant, it is intended for production-volume applications where the firmware is finalized and code changes are not expected in the field. Key differentiating features include a Harvard RISC architecture with 14-bit instruction words, an analog comparator module with programmable reference, a 5-channel 8-bit ADC (depending on device variant), in-circuit serial programming (ICSP) capability, and an extremely low standby current that enables battery-powered designs. The 13 I/O pins each source or sink up to 25 mA, providing direct drive capability for LEDs, relays, and small solenoids without external buffers. At the architecture level, the PIC16LC621A uses a Harvard design with separate program and data buses, eliminating instruction-fetch contention with data access and delivering predictable single-cycle execution for almost every instruction. The OTP program memory (1.75 KB) stores firmware permanently after programming, while the 96-byte SRAM holds runtime variables. The integrated analog comparator simplifies threshold detection for battery, sensor, or signal-level applications. Typical applications include low-power consumer appliances, sensor interface nodes, battery chargers, LED controllers, remote-control transmitters, and simple industrial timers. The 4 MHz version (-04) is the lower-speed member of the family, optimized for cost-sensitive designs that do not require the full 20 MHz performance of the -20 sibling. When designing with this MCU, allocate at least one I/O pin for ICSP (typically RB6/RB7) to allow in-system firmware updates during prototyping, even on OTP parts. Ensure the Vdd rise time meets the POR specification to guarantee clean startup. This page synthesizes distributor pricing, drop-in same-package variants, and practical design notes not found in the manufacturer datasheet - including cross-brand compatibility assessment and lifecycle context.

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PIC16LC621A-04E/P

PIC16LC621A-04E/P - 8-Bit 4MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16LC621A-04E/P is an EPROM-based 8-bit CMOS microcontroller from the PIC® 16C family, operating at 4 MHz with 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory and packaged in an 18-pin PDIP (0.300 inch, 7.62 mm) through-hole package. The '04' speed grade designates a 4 MHz maximum clock input, while the 'LC' prefix indicates the low-power CMOS process that allows operation down to 2.5 V supply voltage, and the 'E' suffix denotes the industrial operating temperature range. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and programmable I/O peripherals. The PIC16C family specifically uses a RISC architecture with only 35 single-word instructions, making it well suited to embedded control applications where deterministic timing and a small code footprint are priorities. PIC16LC621A-04E/P sits at the entry level of the PIC16C62x lineup, providing just enough program memory and I/O for cost-sensitive control loops. Key features include 12 I/O pins distributed across two ports (PORTA 5-bit, PORTB 8-bit with programmable weak pull-ups), 80 bytes of data RAM, a two-level hardware stack, and seven special function registers. The core executes one instruction per 200 ns cycle (except program branches, which are two-cycle) and supports direct, indirect, and relative addressing modes for efficient peripheral and register access. A 4 MHz internal oscillator can be selected via configuration fuse to eliminate external clock hardware. Architecturally, the PIC16C62x is built around a Harvard-style split-bus design with 14-bit wide instructions and 8-bit data, paired with a 200 ns instruction pipeline that gives the family its deterministic interrupt and timing behavior. The PIC16LC621A specifically targets applications that need the analog comparator peripheral of the PIC16C62x family but do not require the on-chip ADC of the larger PIC16C622/PIC16C622A variants, keeping cost and silicon area minimal. Typical applications include appliance control, sensor signal conditioning, simple PWM fan or motor control loops, low-cost LED lighting controllers, and white-goods user-interface modules. The wide 2.5 V to 6.25 V supply range allows direct connection to 3.3 V or 5 V rails without external level shifters. Industrial-grade parts with the 'E' suffix support -40 °C to +125 °C operating temperatures, which is required for outdoor, automotive-cabin, and factory-floor deployments. When designing with this MCU, reserve one of the PORTA pins for the analog comparator and configure the MCLR pin with a proper external pull-up, since this family does not provide an internal MCLR pull-up. Allow at least 4 ms Vdd rise time at power-up so the internal power-on-reset circuit releases the part cleanly into user code.

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PIC16LC621A-04E/SO

PIC16LC621A-04E/SO - 8-Bit 4MHz OTP MCU, 18-SOIC | Microchip

The Microchip Technology PIC16LC621A-04E/SO is an 8-bit EPROM-based CMOS microcontroller from the PIC16C family, offering 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory, 96 bytes of RAM, and 12 I/O pins in a surface-mount 18-SOIC package rated for the automotive operating range. It executes instructions at a 4MHz maximum clock rate with a 200ns single-cycle instruction time (except program branches, which take two cycles), and operates across a 2.5V to 6.25V supply range, drawing only microamp-level quiescent current typical of the LC low-power process variant. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), working RAM, and peripheral I/O on one die. The PIC16C family uses a 14-bit wide instruction word and an 8-bit data path with a two-level hardware stack, making it one of the smallest and most deterministic 8-bit architectures ever shipped. Within that hierarchy, the PIC16LC621A sits as an LC (low-power CMOS) variant of the OTP mid-range PIC16C62x series, between the PIC12 and PIC17/18 series in capability and between raw logic ICs and full application processors in system complexity. Key features of this part include 35 single-word instructions to learn, two 8-bit timers (Timer0/Timer1), one capture/compare/PWM module, a watchdog timer with on-chip RC oscillator, and an internal 4MHz RC oscillator option for designs that need to minimize external components. It supports in-circuit serial programming (ICSP) via the RB6/RB7 pins, enabling firmware updates after PCB assembly. The wide 2.5V to 6.25V VDD range is unusual and reflects the LC process family. Technically, the part uses a Harvard architecture with separate program and data buses, RISC-style single-cycle execution (most instructions), and direct/indirect/relative addressing modes. Seven or eight special-function hardware registers control the core, and the two-level deep hardware stack limits nesting but keeps interrupt latency deterministic. Brown-out reset and power-on reset are integrated, reducing external reset circuitry. Typical applications include automotive body controllers, sensor interface modules, low-power remote controls, appliance user-interface boards, and simple closed-loop control loops where deterministic interrupt response and small code size matter more than raw throughput. It also fits legacy industrial designs that have standardized on the PIC16C62x pinout across product generations. Designers should plan their firmware around the 1K-word instruction limit and the 96-byte RAM, and budget stack depth to two levels. Because the device is OTP, a windowed CERDIP version is required for prototype iteration; for volume production the flash-based PIC16F62x family offers the same pinout and instruction set.

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PIC16LC621A-04E/SS

PIC16LC621A-04E/SS - 8-bit OTP MCU, 4MHz, 1.75KB EPROM | Microchip

The Microchip PIC16LC621A-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16LC62x family, delivering 1.75 KB of one-time-programmable (OTP) program memory and 96 bytes of RAM in a 20-pin SSOP (5.30 mm body) package with a 4 MHz maximum clock input and 200 ns single-cycle instruction execution. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a small, low-power RISC microcontroller that integrates CPU, non-volatile OTP program memory, RAM data memory, and digital peripherals on a single CMOS die. Within the broader hierarchy (8-bit microcontroller -> RISC microcontroller -> microcontroller -> embedded IC -> semiconductor), the PIC16LC62x sits at the lower end of Microchip's mid-range PIC16 architecture, designed for cost-sensitive, low-pin-count embedded control tasks where the firmware is finalized during development and not field-upgradable. Key features of the PIC16LC621A-04E/SS include a 14-bit instruction word with only 35 single-cycle instructions to learn (excluding program branches, which take two cycles), a two-level deep hardware stack, direct/indirect/relative addressing modes, seven or eight special-function hardware registers, and an integrated watchdog timer, power-on reset, and brown-out reset. The "LC" voltage class supports 2.5 V to 6.25 V operation, allowing both 3.3 V and 5 V rails, while the "04" suffix denotes the 4 MHz speed grade. The "E" suffix designates the extended industrial temperature range (-40 °C to +125 °C). The device architecture uses a Harvard-style separate program/data bus optimized for deterministic 200 ns instruction cycles, with a small but efficient interrupt structure. Twelve to thirteen GPIO pins share package pins with peripheral functions, and the on-chip RC oscillator option reduces external component count. Total I/O count and peripheral map vary slightly within the PIC16LC62x sub-family, but the 621A variant provides 12 I/O with analog comparator support. Typical applications include low-cost consumer appliances, sensor interface modules, simple motor and relay control, LED driving and indicator panels, battery-powered handheld instruments, and industrial automation edge nodes where 8-bit processing headroom and minimal BOM are more important than connectivity or DSP performance. When designing with this part, note that OTP memory cannot be reprogrammed in-circuit; for development cycles, use the windowed (JW) or flash-based PIC16F62x equivalent. Brown-out reset and watchdog timer configuration are controlled by configuration-word bits set during programming and cannot be changed at runtime. Always place a 0.1 µF decoupling capacitor within a few millimeters of VDD. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, organized to help procurement and embedded engineers evaluate the PIC16LC621A-04E/SS quickly.

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PIC16LC621A-04I/P

PIC16LC621A-04I/P - 4MHz 8-bit OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16LC621A-04I/P is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C family, featuring 1.75KB (1K x 14) of program memory, 96 bytes of RAM, and 13 I/O pins, all housed in an 18-pin PDIP (P) through-hole package. It operates at up to 4 MHz clock speed with a 200 ns single-cycle instruction execution time, supports a 2.5V to 6.25V supply voltage range, and offers 35 single-word instructions with a two-level deep hardware stack. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, program memory, RAM, and peripherals into a single package. The PIC16C series uses a RISC-based Harvard architecture with 12-bit wide instructions and an 8-bit wide data path, which simplifies firmware development while delivering deterministic real-time response for embedded control. The PIC16LC621A belongs to the Microchip mid-range PIC16 family, occupying the low-power (LC) tier optimized for battery-operated and industrial applications where minimal quiescent current matters. Key features include an internal comparator with programmable reference, 13 digital I/O lines capable of sourcing/sinking 25 mA per pin, a watchdog timer with its own on-chip RC oscillator for reliable operation, and a power-on reset (POR) circuit. The device supports in-circuit serial programming (ICSP) via two pins, allowing firmware updates without removing the chip from the board, which is invaluable in field-deployed equipment. Two 8-bit timers plus one watchdog timer provide flexible event scheduling. The PIC16LC621A-04I/P uses a CMOS process with EPROM-based program memory, which makes it one-time-programmable (OTP). This is preferred in low-volume or industrial control applications where firmware is finalized in production and field updates are not expected. The LC variant (low-power CMOS) draws roughly half the operating current of the standard PIC16C621A, extending battery life in remote sensor nodes. Direct, indirect, and relative addressing modes give the compiler flexibility in code generation. Typical applications include industrial control logic, appliance controllers (washing machines, microwave ovens, HVAC), remote sensor interfaces, low-end automotive body modules, and general-purpose embedded control where simplicity, deterministic timing, and cost-effectiveness outweigh the need for larger memory. Its wide voltage range also suits battery-powered products. As a drop-in successor to older PIC16C621A-04/P designs, the LC variant is commonly specified for new low-power designs and legacy refresh programs. When designing with this part, ensure the system clock configuration matches the 4 MHz maximum for the -04 speed grade, and budget adequate supply decoupling (100 nF ceramic plus 10 uF bulk) close to VDD/VSS pins. The OTP memory means firmware must be fully validated before programming - there are no field re-program cycles. For higher memory or in-system re-programmability, consider the PIC16F family (Flash-based) as a future-proof migration path on the same 18-pin footprint. This page synthesizes distributor pricing from Mouser/DigiKey/LCSC, drop-in same-package alternatives, and practical engineering guidance not found in the manufacturer datasheet alone.

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PIC16LC621AT-04/SS

PIC16LC621AT-04/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16LC621AT-04/SS is an 8-bit RISC CMOS microcontroller from the PIC® 16C family, featuring 1.75KB (1K x 14) of One-Time-Programmable (OTP) program memory, 96 bytes of data RAM, and a maximum clock speed of 4 MHz, housed in a 20-pin SSOP package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), working RAM, peripheral set, and I/O on one die; the PIC16LC621A belongs to the PIC16 mid-range 8-bit MCU family, which sits within the broader hierarchy: 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. PIC mid-range cores use a 14-bit instruction word with an 8-bit data path, a two-level hardware stack, and Harvard architecture (separate program and data buses). The LC suffix designates the low-voltage CMOS variant optimized for 2.5V to 6.0V operation. Key features include 12 I/O pins, two analog comparators, one 8-bit timer (Timer0), a Watchdog Timer (WDT) for code-lock recovery, and an internal RC oscillator option. The OTP memory is programmed once using Microchip's ICSP (In-Circuit Serial Programming) interface and is retained for the life of the device. The part is offered in tape-and-reel packaging as the /SS SSOP-20 form factor. The PIC16LC621A uses a RISC-style core with only 35 single-word/single-cycle instructions (most are 1-cycle except branches), enabling predictable deterministic execution at 4 MHz (250 ns instruction cycle). Seven or eight Special Function Registers (SFRs) manage core state, and the device supports direct, indirect, and relative addressing modes. Two comparators can be software-routed to I/O pins for analog threshold detection. Typical applications include low-power embedded control, automotive body modules (with the extended-temperature -I/SS variant), industrial sensor interfaces, simple motor and relay drivers, and battery-operated consumer appliances. The LC voltage range also makes it suitable for 3.3V systems where a true 5V-only PIC would be inappropriate. Designers should note that the 'T' suffix indicates tape-and-reel packaging, '04' is the 4 MHz speed grade, and the LC family requires a regulated 2.5V-6.0V supply. OTP parts cannot be reprogrammed; choose the PIC16F621A Flash equivalent if in-field firmware updates are required.

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PIC16LC621AT-04E/SO

PIC16LC621AT-04E/SO - 8-Bit 4MHz OTP MCU, 1.75KB, 18-SOIC | Microchip

The Microchip PIC16LC621AT-04E/SO is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C family, operating at up to 4 MHz clock speed and housed in an 18-pin SOIC (SO) package. It integrates 1.75 KB of program memory (organized as 1K x 14) and 96 bytes of RAM (96 x 8), with a 12-bit wide instruction word and 8-bit wide data path. The supply voltage range is 2.5 V to 6.25 V, supporting both 3.3 V and 5 V designs. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/EPROM/Flash), data memory (RAM), and peripheral interfaces such as timers, I/O ports, and communication modules. Within the semiconductor hierarchy, an MCU is a sub-class of embedded processor -> microprocessor -> digital IC. The PIC16LC621A specifically belongs to Microchip's mid-range PIC16 family, characterized by a 14-bit instruction set, two-level hardware stack, and Harvard-style separate program/data buses. Key features of the PIC16LC621AT-04E/SO include 13 I/O pins, seven or eight special function hardware registers, and direct, indirect, and relative addressing modes. It is rated for the automotive operating temperature range (per the 'E' designator) and uses One-Time Programmable (OTP) EPROM for code storage, making it suitable for low-to-medium volume production. The device supports Watchdog Timer, power-on reset, and sleep low-power modes typical of the PIC mid-range architecture. Technically, the PIC16LC621A employs a RISC instruction set with most instructions executing in a single instruction cycle (4 oscillator clocks). Its CMOS process yields low power consumption, and the 'LC' variant specifies a low-voltage (2.5 V minimum) operation, ideal for battery-backed or 3.3 V-only systems. The 18-SOIC package offers an industry-standard footprint compatible with hand-soldering and automated SMT assembly. Typical applications include automotive body controllers, low-end sensor interfaces, appliance controls, and industrial logic replacement. The OTP memory is well-suited to mature, stable firmware where field re-programmability is not required. A key design consideration is that the 'A' suffix denotes an enhanced silicon revision; engineers should confirm register-level compatibility with older PIC16C621 firmware. OTP parts cannot be reprogrammed, so emulator or flash-based PIC16F621 prototypes are recommended during development. This page synthesizes distributor stock data, parametric alternatives, and practical design notes not aggregated in a single place on the manufacturer datasheet, enabling faster engineering and procurement decisions.

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PIC16LC621AT-04E/SS

PIC16LC621AT-04E/SS - 8-Bit OTP MCU, 4MHz, 1.75KB | Microchip

The Microchip Technology PIC16LC621AT-04E/SS is an 8-bit EPROM-based CMOS microcontroller from the PIC16C family, featuring a 4MHz instruction cycle, 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory, and 96 bytes of RAM in a 20-pin SSOP package. The 'LC' prefix designates the low-voltage (2.5V-6.25V) variant, while the '04' indicates the 4MHz maximum clock speed and 'T' denotes the tape-and-reel packaging format. The 'E' suffix marks the extended (industrial) temperature grade. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and I/O peripherals on one die. The PIC16LC621AT belongs to the EPROM/OTP branch of the PIC16 mid-range architecture, which uses a 14-bit wide instruction set with separate 8-bit data paths, a two-level deep hardware stack, and direct/indirect/relative addressing. The PIC16 family sits within Microchip's broader PIC microcontroller hierarchy (PIC10/12/16/18/24/32) and is one of the longest-running 8-bit MCU lines in the industry. Key features of this device include 12 I/O pins, two 8-bit timer/counters, a watchdog timer, Power-On Reset (POR), Brown-out Detect/Reset, and a programmable code protection mechanism. The OTP program memory allows one-time field programming via standard PIC programmers, making the device well suited to low-volume production runs where mask-ROM volume is not justified. With 12-bit wide instructions and 35 single-word instructions, the core delivers predictable deterministic execution at 250 ns per instruction at 4MHz. Typical applications include low-cost consumer appliances, sensor signal conditioning front-ends, simple motor control loops, automotive body electronics (non-safety), remote-control transmitters, and battery-powered instruments where the wide 2.5V-6.25V supply range provides flexibility across 3.3V and 5V rails. The extended temperature grade permits operation from -40C to +125C, fitting industrial and automotive underhood environments. When designing with this part, note that OTP memory cannot be erased - firmware must be fully validated before programming. The device is in production but has been superseded in many designs by the Flash-based PIC16F628 (pin-compatible upgrade path), and the PIC16LC621AT remains the preferred choice only when OTP cost advantages or security requirements matter. This page synthesizes distributor stock and pricing data, drop-in compatible alternatives in the 20-SSOP footprint, and practical design notes not collected in a single place in the manufacturer datasheet, helping procurement and design engineers shortlist compatible parts faster.

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PIC16LC621AT-04I/SO

PIC16LC621AT-04I/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16LC621AT-04I/SO is an 8-bit RISC microcontroller from the PIC16C family, featuring 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory, 96 bytes of RAM, and a 4 MHz instruction-cycle clock. The 'LC' prefix denotes the low-power CMOS variant, allowing operation across a 2.5V to 6.25V supply range from a single 18-pin SOIC (SO-18, 0.300-inch wide) package. The 'T' suffix indicates tape-and-reel packaging, while 'I' marks the industrial operating temperature range of -40C to +85C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O on one die. The PIC16C family uses a RISC Harvard architecture with separate program and data buses, a fixed 12-bit-wide instruction word, an 8-bit-wide data path, two-level deep hardware stack, and seven/eight special function registers. Direct, indirect, and relative addressing modes are supported. As part of the broader hierarchy, this PIC16 MCU sits under: microcontroller -> embedded MCU -> microprocessor-based system -> semiconductor. Synonyms: MCU, microcontroller unit, embedded controller. Key features include 13 general-purpose digital I/O pins (12 I/O ports per datasheet overview), a 4 MHz internal/external oscillator option, low-power CMOS construction with typical sleep currents in the microamp range, and an on-chip watchdog timer for safety-critical embedded control. The OTP program memory allows one-time field programming using standard PIC development tools, which is well-suited to mature production designs where code is finalized. The architecture is built around a 14-bit instruction set optimized for compact code density, allowing simple control loops, state machines, and peripheral driving tasks to fit in the small 1K instruction-word memory. Brown-out reset, power-on reset, and a programmable code-protect bit are provided. The '04' speed grade (4 MHz) is the lowest clock speed in the family and yields the lowest dynamic power consumption. Typical applications include appliance control (washing machines, microwave ovens, HVAC fan control), industrial sensor interfaces, low-cost remote controls, automotive interior subsystems (non-safety), battery-powered metering, and consumer white goods. The wide 2.5-6.25V supply tolerance makes the part tolerant of unregulated wall-adapter rails. When designing with this device, pay attention to the OTP nature of program memory - firmware must be fully validated before programming because re-programming in-circuit is not possible. A 100 nF decoupling capacitor placed within 5 mm of VDD and a 10-100 uF bulk capacitor on the supply rail are recommended. MCLR must be pulled high through a 10 kohm resistor for normal operation. This page synthesizes distributor pricing from DigiKey, Mouser, LCSC, and Octopart, cross-references drop-in same-package alternatives from the PIC16C621A family, and provides practical design notes not consolidated in the manufacturer datasheet alone.

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PIC16LC621AT-04I/SS

PIC16LC621AT-04I/SS - 8-Bit 4MHz OTP MCU 1.75KB 20-SSOP | Microchip

The Microchip Technology PIC16LC621AT-04I/SS is an 8-bit RISC microcontroller from the PIC® 16C family, featuring 4 MHz CPU clock speed, 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory, and 96 bytes of RAM in a 20-pin SSOP package with industrial -40C to +85C operating range. The device integrates 13 general-purpose I/O pins, a 2-level deep hardware stack, and core peripherals including Brown-out Detect (BOD), Power-On Reset (POR), and Watchdog Timer (WDT), supporting operation from 2.5 V to 6.25 V supply rails. A PIC microcontroller (MCU) is a compact, self-contained computer-on-a-chip combining an 8-bit CPU, non-volatile program memory (here, OTP), volatile RAM, and configurable I/O peripherals on a single die. PIC MCUs sit in the broader hierarchy of embedded controllers -> microcontrollers -> 8-bit microcontrollers -> RISC microcontrollers -> semiconductors, and are widely used in cost-sensitive consumer and industrial control products. The 'C' in PIC16C indicates an OTP EPROM-based program memory architecture, distinguishing it from flash-based PIC16F variants. Key features of the PIC16LC621AT-04I/SS include 12-bit wide instruction set with an 8-bit data path, seven or eight special function hardware registers, direct/indirect/relative addressing modes, and CMOS low-power technology supporting the wide 2.5 V to 6.25 V supply range. The /SS suffix denotes the 20-pin SSOP (Shrink Small Outline Package) form factor, and the '04' speed grade specifies 4 MHz maximum clock. The 'I' industrial temperature grade supports -40C to +85C ambient operation. According to the Microchip datasheet, this part belongs to the mid-range PIC16C6xx family and is suitable for products where one-time programmable memory and a small footprint are acceptable. Typical applications span white goods and small appliance controllers, automotive body electronics (non-AEC-Q100), simple sensor interfaces, consumer remote controls, low-end timer/sequencer logic, and replacement of discrete logic in cost-optimized designs. For applications requiring in-system reprogrammability, designers should migrate to a flash-based PIC16F equivalent instead. The 20-SSOP package offers a compact 0.209 inch (5.30 mm) body width for high-density board layouts. When designing with this device, carefully verify that OTP programming is acceptable for your production flow, since OTP parts cannot be erased or rewritten. Plan for adequate supply decoupling and ensure the WDT is enabled or disabled intentionally per the application requirement. According to the Microchip datasheet, the PIC16LC621A family is mature and may be subject to lifecycle transitions; verify current availability with Microchip before committing to new designs.

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PIC16LC621T-04/SO

PIC16LC621T-04/SO - 8-Bit PIC MCU, 4MHz, 1.75KB OTP | Microchip

The Microchip Technology PIC16LC621T-04/SO is an 8-bit PIC microcontroller from the PIC16C family, operating at 4 MHz and delivering 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory and 80 bytes of RAM in an 18-pin SOIC package. Tape-and-reel packed for high-volume assembly, the device targets low-cost, low-power embedded control in industrial, automotive and consumer applications where deterministic 8-bit RISC performance is sufficient. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable I/O peripherals. The PIC16C family from Microchip is built on a Harvard-architecture RISC core with separate program and data buses, 12-bit-wide instructions and an 8-bit-wide data path. Inside the PIC16LC621 the core is paired with seven (or eight) special-function hardware registers, a two-level-deep hardware stack, and direct/indirect/relative addressing modes that map efficiently onto compiled C and assembly source. Key features include a 4 MHz maximum clock, 12 CMOS-compatible I/O lines, OTP program memory suited to fixed-code production runs, internal oscillator support, and power-saving SLEEP mode. The 'LC' supply range of 2.5 V to 6.25 V lets the part run directly from a 3.3 V or 5 V rail without a separate regulator. Compared with flash-based PIC16F parts, the OTP variant reduces unit cost in mature, code-stable products where in-field firmware updates are not required. Typical applications include appliance controls, sensor signal conditioning, low-end remote keyless entry transmitters, automotive body modules, and simple logic-replacement glue. The 18-SOIC footprint remains popular for through-hole-free board designs that migrate from DIP-18 prototypes. When designing with this device, observe the maximum clock versus supply-voltage derating in the datasheet, keep RESET/MCLR decoupling tight, and reserve the OTP programmer footprint on first-article builds. Migration to the flash-based PIC16F627 (same pinout) is recommended for new designs that need firmware iteration. This page synthesises distributor pricing, drop-in same-package alternatives, and engineering design notes for the PIC16LC621T-04/SO that are not found in a single manufacturer datasheet.

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PIC16LC620AT-04I/SO - 8-Bit 4MHz OTP MCU, 896B | Microchip

PIC16LC620AT-04I/SS - 8-bit OTP MCU 4MHz 13 I/O | Microchip

PIC16LC620T-04/SO - 4MHz 8-Bit OTP MCU 18-SOIC | Microchip

PIC16LC620T-04E/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip

PIC16LC620T-04E/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip

PIC16LC620T-04I/SS - 8-bit 4MHz PIC MCU, 896B OTP, 20-SSOP

PIC16LC621-04/P - 4MHz 8-bit OTP MCU, 1.75KB, 18-DIP | Microchip

PIC16LC621-04/SO - 4MHz 8-Bit CMOS MCU, 1.75KB OTP, 18-SOIC | Microchip

PIC16LC621-04E/P - 4MHz 8-bit OTP MCU 1.75KB DIP-18 | Microchip

PIC16LC621-04E/SO - 4MHz 1.75KB OTP 8-bit MCU 18SOIC | Microchip

PIC16LC621-04I/P - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip

PIC16LC621-04I/SS - 4MHz 8-bit OTP MCU, 1.75KB | Microchip

PIC16LC621A-04/SO - 8-Bit 4MHz OTP MCU, 1.75KB | Microchip

PIC16LC621A-04/SS - 8-Bit 4MHz OTP MCU 1.75KB 20-SSOP | Microchip

PIC16LC621A-04E/P - 8-Bit 4MHz OTP MCU 1.75KB | Microchip

PIC16LC621A-04E/SO - 8-Bit 4MHz OTP MCU, 18-SOIC | Microchip

PIC16LC621A-04E/SS - 8-bit OTP MCU, 4MHz, 1.75KB EPROM | Microchip

PIC16LC621A-04I/P - 4MHz 8-bit OTP MCU 1.75KB | Microchip

PIC16LC621AT-04/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip

PIC16LC621AT-04E/SO - 8-Bit 4MHz OTP MCU, 1.75KB, 18-SOIC | Microchip

PIC16LC621AT-04E/SS - 8-Bit OTP MCU, 4MHz, 1.75KB | Microchip

PIC16LC621AT-04I/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip

PIC16LC621AT-04I/SS - 8-Bit 4MHz OTP MCU 1.75KB 20-SSOP | Microchip

PIC16LC621T-04/SO - 8-Bit PIC MCU, 4MHz, 1.75KB OTP | Microchip