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PIC16C621-04E/P - 4MHz 8-Bit OTP MCU 1.75KB | Microchip DIP-18
PIC16C621-04E/P

PIC16C621-04E/P - 4MHz 8-Bit OTP MCU 1.75KB | Microchip DIP-18

The Microchip Technology PIC16C621-04E/P is an EPROM-based 8-bit CMOS microcontroller (MCU) featuring 1.75KB (1K x 14) of one-time programmable (OTP) program memory and 80 bytes of RAM, housed in an 18-pin PDIP (DIP-18) through-hole package. The device operates at up to 4 MHz across a 3V to 6V supply range and provides 13 digital I/O pins with a RISC instruction set of 35 single-word instructions, making it suitable for compact embedded control designs. An OTP-based 8-bit MCU is a microcontroller whose program memory can be written once by the user and then becomes non-volatile, replacing older UV-erasable EPROM parts in cost-sensitive production. In the broader taxonomy it sits under microcontroller -> embedded processor -> digital IC -> semiconductor. The PIC16C series uses a Harvard RISC architecture with separate program and data buses, which simplifies deterministic timing and reduces interrupt latency compared with von Neumann CISC designs of the same era. Key features include 4 MHz maximum clock, 13 I/O pins, two 8-bit timers (Timer0 and Timer2) plus one 16-bit timer (Timer1), a capture/compare/PWM (CCP) module, and an analog comparator. Power consumption is 15 uA typical at 5V / 4 MHz and 1 uA typical at 3V / 32 kHz, supporting battery-backed applications. The "E" suffix denotes the Extended temperature grade (-40C to +125C) and the "04" speed code specifies the 4 MHz maximum oscillator frequency. The architecture uses a 14-bit instruction word with a 200 ns instruction cycle at 20 MHz equivalent pipelining (4 MHz part uses 1 us cycle). Static design allows the clock to be stopped without losing register state, useful for low-power standby. The 18-pin PDIP format supports prototyping, breadboarding, and through-hole production where socketed replacement is desired, especially for legacy designs and industrial controllers. Typical applications include appliance control, automotive body electronics, sensor signal conditioning with on-chip comparator, simple PWM-driven loads such as fans or solenoids, and remote-control transmitter logic. The combination of OTP memory, extended temperature range, and small package has made the PIC16C621 a long-lifecycle part for industrial and automotive subsystems. When designing, note that OTP memory cannot be re-programmed; for in-field updates choose a Flash-based PIC16F equivalent. Brown-out reset, watchdog timer, and power-on reset are integrated. Decoupling should include a 0.1 uF ceramic capacitor close to VDD, and MCLR must be tied to VDD through a resistor for normal operation or to a reset supervisor for fail-safe startup. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C621-04I/P - 4MHz 8-bit OTP MCU, 1.75KB EPROM, DIP-18
PIC16C621-04I/P

PIC16C621-04I/P - 4MHz 8-bit OTP MCU, 1.75KB EPROM, DIP-18

The Microchip Technology PIC16C621-04I/P is a low-power, high-speed CMOS EPROM-based 8-bit microcontroller built on Microchip's PIC® RISC architecture, delivering 1.75 KB (1K x 14) of one-time-programmable (OTP) program memory, 80 bytes of RAM, and 13 digital I/O pins in a through-hole 18-pin PDIP package rated for industrial temperature operation. It executes most instructions in a single 200 ns cycle at 4 MHz, providing deterministic interrupt response and code density that has made the PIC16C family a workhorse for cost-sensitive embedded control since the 1990s. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and configurable peripheral I/O. In the broader semiconductor taxonomy, the PIC16C621 sits within: microcontroller -> 8-bit MCU -> RISC MCU -> embedded controller. The 8-bit class targets simple deterministic control (sensors, switches, motor drivers, human-machine interfaces) where 32-bit performance is unnecessary and cost-per-pin matters more than raw throughput. Key features include a 4 MHz maximum operating frequency, a wide 3.0 V to 6.0 V supply range, an internal oscillator option, a watchdog timer with its own on-chip RC oscillator, and 15 µA typical active current at 5 V / 4 MHz dropping to 1 µA typical in standby at 3 V / 32 kHz, enabling battery-friendly duty-cycled designs. Industrial temperature grade (-40 °C to +85 °C), EPROM-based OTP program memory for prototype-to-production flexibility, and a fully static design allowing clock stop. The PIC16C621 uses a Harvard architecture with separate program and data buses, a 14-bit instruction word, and a 35-instruction set optimized for code density. Its CMOS EPROM cell technology and low-power design philosophy enable reliable operation across commercial, industrial, and extended-temperature windows, with brown-out reset and power-on reset integrated on-chip. Typical applications include appliance control, sensor signal conditioning front-ends, simple motor and solenoid drivers, automotive body electronics (legacy), HVAC damper/valve control, and industrial IO modules. The 13 I/O pins are sufficient for keypad scanning, LED driving, and UART/SPI bit-banged communication without external glue logic. When designing with this part, note that OTP memory cannot be re-programmed in-circuit - firmware must be verified before burn-in. For modern designs requiring field updates, choose a flash-based PIC16F equivalent. Decoupling: place a 0.1 µF ceramic capacitor within 5 mm of VDD and a 10 µF bulk cap on the power rail. This page synthesizes distributor pricing, drop-in PIC16 family alternatives, and practical design notes not found in the standalone Microchip datasheet, enabling faster BOM decisions for both legacy maintenance and new 8-bit designs.

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PIC16C621-20/P - 1.75KB OTP 8-Bit MCU 20MHz | Microchip 18-DIP
PIC16C621-20/P

PIC16C621-20/P - 1.75KB OTP 8-Bit MCU 20MHz | Microchip 18-DIP

The Microchip Technology PIC16C621-20/P is an EPROM/ROM-based 8-bit CMOS microcontroller in the PIC16C6x family, offered in a 18-pin PDIP through-hole package. It integrates 1.75KB (1K x 14) of One-Time-Programmable (OTP) program memory, 80 bytes of RAM, and 13 digital I/O pins, and runs at up to 20MHz from a 3.0V to 6.0V supply. The '-20' speed grade denotes a 20MHz maximum oscillator frequency, while the '/P' suffix confirms the 0.300-inch wide plastic DIP package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, working RAM, and peripheral I/O on one die, optimized for deterministic embedded control. PIC microcontrollers sit in the broader hierarchy of microcontrollers -> embedded processors -> semiconductors, and the PIC16C family occupies the original mid-range PIC architecture with 35 single-word instructions and a 14-bit instruction word. Compared to Flash-based successors (PIC16F), this OTP EPROM variant is one-time programmable and is typically used in low-volume or mature production designs. Key features include a fully-static CMOS design, wide operating voltage range to 6.0V, and very low power consumption (15 uA typical at 5V/4MHz and 1 uA at 3V/32 kHz). The PIC16C621 includes an 8-bit timer/counter, a watchdog timer with its own on-chip RC oscillator for reliable reset, and a power-on reset circuit. Compared to the PIC16C620, the PIC16C621 adds a 5-bit analog comparator, while the 'C' (CMOS EPROM) suffix distinguishes it from earlier NMOS parts. Architecturally the device uses a Harvard RISC core with separate 14-bit program and 8-bit data paths, allowing most instructions to execute in a single 200ns instruction cycle at 20MHz. The 13 I/O pins are multiplexed with peripheral functions and are bidirectional with individually programmable direction. The CMOS EPROM process technology makes the part suitable for battery-powered and industrial environments where static power dissipation must be kept in the microampere range. Typical applications include appliance controllers, automotive subsystems, low-power sensor interfaces, and simple closed-loop control where the OTP memory provides cost-effective firmware storage. The wide 3.0V to 6.0V supply range and industrial/extended temperature options make this part popular in industrial instrument clusters, HVAC controls, and legacy embedded products. When designing with the PIC16C621-20/P, plan for an EPROM programmer window or socketed programming during prototyping, and verify that the 20MHz oscillator grade matches system timing budgets. Note that the OTP version cannot be electrically erased, so firmware must be fully validated before production programming. For new designs, evaluate the flash-based PIC16F84A/PIC16F628A equivalents on the same 18-pin DIP footprint.

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PIC16C621-20E/SO - 8-Bit 20MHz OTP MCU 1.75KB | Microchip
PIC16C621-20E/SO

PIC16C621-20E/SO - 8-Bit 20MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16C621-20E/SO is a PIC16C-family 8-bit RISC microcontroller built on EPROM/ROM CMOS technology, featuring a 20 MHz maximum clock speed, 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory, 80 bytes of RAM, and 13 general-purpose I/O pins, housed in an 18-pin SOIC package with an extended operating temperature grade. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (ROM/EPROM/Flash), volatile data memory (RAM), and peripheral interfaces such as timers, comparators, and I/O ports on a single die. Within the broader hierarchy, the PIC16C621 sits in the legacy PIC16C OTP/EPROM-based family, which evolved into the flash-based PIC16F mid-range lineup. These MCUs are widely used in cost-sensitive, deterministic control applications where interrupt latency, low part count, and predictable instruction cycles outweigh the need for high memory density. Key features include a wide operating voltage range of 3.0 V to 6.0 V, ultra-low power consumption of 5 mA typical at 5 V/4 MHz and 1 µA typical at 3 V/32 kHz, a fully static design that supports DC operation, and integrated peripherals including a comparator module. The extended ('E') temperature grade allows operation from -40 °C to +125 °C, suitable for automotive and industrial environments. The device uses a Harvard-architecture RISC core with only 35 single-word instructions, most executing in a single instruction cycle (200 ns at 20 MHz). Its OTP EPROM memory allows one-time field programming via a device programmer such as Microchip's MPLAB PM3, and the SOIC-18 package is compatible with standard surface-mount assembly lines. The wide supply range (3.0-6.0 V) supports both 3.3 V and 5 V system designs. Typical applications include automotive body and chassis controllers, white-goods and appliance control, low-end consumer electronics, sensor-signal conditioning, and industrial remote-control transmitter/receiver logic. The wide temperature range and rugged SOIC packaging also suit outdoor industrial sensor-interface modules and HVAC control boards. When designing with this MCU, note that OTP memory cannot be reprogrammed in-circuit; the firmware must be fully validated before programming. For new designs, engineers typically migrate to flash-based PIC16F equivalents (e.g., PIC16F627A) which offer in-system programming, more memory, and lower unit cost. This page synthesizes distributor pricing, drop-in alternatives from the same PIC16C family, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C621-20E/SS - 8-Bit 20MHz OTP MCU 1.75KB | Microchip
PIC16C621-20E/SS

PIC16C621-20E/SS - 8-Bit 20MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16C621-20E/SS is an 8-bit CMOS microcontroller from the PIC16C62x family based on RISC architecture, operating at up to 20MHz clock speed with 1.75KB (1K x 14) of One-Time-Programmable (OTP) program memory, 80 bytes of RAM, and 128 bytes of EEPROM data memory, housed in a 20-pin SSOP (Shrink Small Outline Package) with gull-wing leads. Key features include a 14-bit instruction set, 35 instructions, two 8-bit timers/counters, a watchdog timer with on-chip RC oscillator, an analog comparator module, programmable code protection, and a wide operating temperature range suitable for industrial and automotive-grade applications. The device supports in-circuit serial programming (ICSP) and operates from 2.5V to 6.0V across commercial, industrial, and extended temperature grades. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a type of embedded processor that contains EPROM-based program storage which can be written once and then behaves like ROM for the rest of the device's lifetime. Microcontrollers (MCUs) belong to a product hierarchy from PIC16C family -> PIC16 architecture -> 8-bit microcontroller -> embedded controller -> semiconductor IC. OTP MCUs offer the cost advantage of ROM parts while allowing late-stage firmware customization before the final mask ROM commit, making them ideal for low-to-medium volume production runs where mask-ROM NRE costs cannot be justified. The PIC16C621-20E/SS leverages Microchip's enhanced PIC16C mid-range core with a Harvard architecture featuring separate program and data buses, enabling simultaneous instruction fetch and operand access. The 14-bit wide instruction word and 35-instruction set deliver compact code density (~2:1 over comparable 8-bit CISC cores), while the 20MHz oscillator input yields a 200ns instruction cycle, providing predictable real-time interrupt response for automotive body controllers, sensor interfaces, and battery-powered industrial nodes. Built-in peripherals include an 8-bit ADC-less analog comparator block, two Capture/Compare/PWM (CCP) modules (family-feature), and synchronous/asynchronous serial via the USART. Typical applications include automotive body electronics (seat controllers, mirror adjusters, lighting modules), industrial sensor interface boards, low-power remote sensor nodes, home appliance control boards, and embedded control for legacy replacement of discrete logic. The PIC16C621-20E/SS variant specifically targets automotive-grade deployment (Automotive temperature grade per the Partstack terminal-form entry) at 20MHz maximum frequency. When designing with this device, ensure that OTP programming accounts for firmware revision control, as OTP memory cannot be erased or rewritten once programmed. Provide adequate decoupling (100nF + 10uF bulk) near VDD, follow Microchip AN529 emitter-follower layout recommendations for the analog comparator inputs, and validate MCLR pull-up timing against in-system ICSP programmer requirements.

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PIC16C621-20I/P - 8-Bit OTP MCU 1.75KB 20MHz 18-DIP | Microchip
PIC16C621-20I/P

PIC16C621-20I/P - 8-Bit OTP MCU 1.75KB 20MHz 18-DIP | Microchip

The Microchip Technology PIC16C621-20I/P is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering up to 20 MHz operation with 1.75 KB (1K x 14) of One-Time-Programmable (OTP) program memory, 80 bytes of RAM, and 13 I/O pins in a 18-pin PDIP through-hole package. It is the industrial temperature (-40C to +85C) variant of the PIC16C621 line and is supplied in tube packaging. A PIC16C-series microcontroller is an 8-bit RISC Harvard-architecture MCU built on Microchip's OTP EPROM/ROM CMOS process. Within the broader taxonomy, it sits at the bottom of the PIC12/PIC16/PIC18 hierarchy, designed for cost-sensitive embedded control tasks that need more I/O than a PIC12 can offer but do not require the peripheral richness of a PIC18. Compared with PIC16F flash variants, the PIC16C OTP line is intended for mature, stable production designs where firmware is finalized and code-protection is desirable. Key features of this part include a wide 2.5V to 6.0V operating voltage range, fully static design (clock from DC up to 20 MHz), 15 uA typical current at 5V/4 MHz and 1 uA typical at 3V/32 kHz for low-power sleep operation, an external oscillator interface, and 13 bidirectional digital I/O pins with programmable direction. Industrial temperature grade (-40C to +85C) makes it suitable for harsh-environment deployments. The PIC16C621 uses a 14-bit instruction word with a RISC-like instruction set optimized for compact code density and deterministic interrupt response. Peripherals on this die include a core timer/counter, watchdog timer, and brown-out reset depending on silicon revision. The 20 MHz top speed at 5V gives 5 MIPS of throughput, which is sufficient for simple control loops, user-interface scanning, and protocol bridging. Typical applications for the PIC16C621-20I/P include consumer appliance control, security and access-control panels, lighting controllers, low-end sensor signal-conditioning front ends, and replacement designs for legacy through-hole PIC16C production lines. Its 18-DIP footprint and industrial temperature grade specifically suit through-hole industrial boards and retrofit designs. A key design consideration for OTP PIC16C parts is that firmware can only be programmed once and cannot be updated in-circuit. Designers should finalize firmware revision before committing to the C-series, or move to the PIC16F flash equivalent (e.g. PIC16F684-I/P) if field-upgrade capability is mandatory. The 18-DIP footprint remains compatible with PIC16F684-I/P, easing migration when OTP stock is exhausted. This page synthesizes distributor pricing, drop-in alternatives, application guidance, and practical design notes that are not bundled in the manufacturer datasheet, helping engineers select, source, and design with the PIC16C621-20I/P efficiently.

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PIC16C621A-04E/SO - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip
PIC16C621A-04E/SO

PIC16C621A-04E/SO - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16C621A-04E/SO is an 18-pin, 8-bit, OTP (One-Time Programmable) CMOS microcontroller from the PIC16C6XX family, operating at up to 4 MHz with 1.75 KB (1K x 14) of program memory and 96 bytes of RAM. Housed in an 18-SOIC (7.50 mm) package, it delivers 4 MHz CPU performance from a 2.5 V to 5.5 V supply while consuming 15 µA typical at 5 V/4 MHz and 1 µA typical at 3 V/32 kHz. The part integrates 13 digital I/O pins, two analog comparators, and the standard PIC16C RISC core with only 35 single-word instructions to learn. An 8-bit OTP microcontroller is a small, low-cost CMOS processor that combines a CPU core, non-volatile program memory, working RAM, and peripheral I/O on a single die. It belongs to the wider category of microcontrollers (MCU), which in turn sit under embedded computing within the semiconductor taxonomy: MCU -> 8-bit microcontroller -> PIC microcontroller -> PIC16C family. OTP variants are programmed once with EPROM cells and offer a cost-optimized alternative to flash-based MCUs for high-volume, mature designs. Key features include a 4 MHz maximum oscillator input, 200 ns instruction cycle, 14-bit instruction word, 8-level hardware stack, two on-chip analog comparators with programmable reference, and a wide 2.5 V to 5.5 V operating range. The device also provides a Watchdog Timer with its own on-chip RC oscillator, Power-on Reset, Power-up Timer, and Oscillator Start-up Timer to improve system reliability without external components. Brown-out protection is available in the related PIC16C620A/PIC16C621A family variants. Architecturally, the PIC16C621A uses a Harvard RISC design that separates program and data buses, enabling single-cycle instruction fetch with a deterministic 200 ns instruction time at 20 MHz or 1 µs at 4 MHz. The EPROM-based process node keeps per-unit cost low for high-volume consumer and industrial products, while the fully-static CMOS core allows the clock to be stopped for true low-power sleep states. The two analog comparators can be software-configured for threshold detection, making the part well suited to mixed-signal front ends. Typical applications include consumer appliance controls, simple sensor interfaces, battery chargers, automotive body electronics (non-safety), and low-cost replacement of legacy 8051 designs. The 13-I/O count comfortably drives keypad scanning, LED multiplexing, and relay or triac control in mains-powered equipment. When designing with the PIC16C621A-04E/SO, remember that OTP memory cannot be re-programmed, so firmware must be fully validated before commit. Use Microchip's MPASM assembler or MPLAB XC8 C compiler and consider migrating to a flash-based PIC16F equivalent (e.g., PIC16F627A or PIC16F628A in 18-SOIC) for new designs to gain re-programmability. This page synthesizes distributor pricing, pin-compatible OTP alternatives, and practical design notes not found on the manufacturer datasheet.

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PIC16C621A-04E/SS - 1.75KB OTP 8-bit MCU, 13 I/O | Microchip
PIC16C621A-04E/SS

PIC16C621A-04E/SS - 1.75KB OTP 8-bit MCU, 13 I/O | Microchip

The Microchip PIC16C621A-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, featuring 1.75KB (1K x 14) of OTP program memory, 96 bytes of RAM, and 13 digital I/O pins housed in a 20-pin SSOP package with 5.30mm body width. It executes instructions at 4 MHz with a 100 ns instruction cycle and operates from 2.5 V to 6.0 V. An 8-bit CMOS microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die; the PIC16C family specifically uses a RISC Harvard architecture with only 35 single-word instructions, making firmware development fast and code-dense for embedded designers. Within the broader hierarchy, the PIC16C621A is a microcontroller (MCU) -> 8-bit MCU -> PIC16 family -> PIC16C62x sub-family (devices with two on-chip analog comparators and no ADC). Key features of the PIC16C621A-04E/SS include two on-chip analog comparators with programmable reference, a 4 MHz internal oscillator option, 13 bidirectional I/O pins with individual direction control, a 16-bit timer/counter (TMR1) with an external crystal option, an 8-bit timer/counter (TMR0), a Watchdog Timer with its own on-chip RC oscillator for reliable resets, and Power-on Reset / Brown-out Reset / Power-up Timer. The EPROM-based program memory is one-time programmable (OTP), which suits cost-sensitive production runs where code is fixed. Architecturally, the PIC16C621A uses a Harvard-style RISC core with separate program and data buses; the 14-bit wide program word keeps most instructions single-word, and the 8-bit data path simplifies arithmetic on byte-wide variables. Brown-out Reset and Power-up Timer ensure clean startup across noisy industrial rails, while the low-power design draws approximately 15 uA typical at 5 V / 4 MHz and only 1 uA typical at 3 V / 32 kHz. Typical applications include automotive subsystems (sensor conditioning using the on-chip comparators), industrial control logic (relay drivers, simple PLC I/O expanders), appliance control (white-goods user-interface boards), and low-power remote sensors. The 13 I/O and two comparators fit cost-sensitive embedded control designs. Design tip: the -04E speed grade (4 MHz) and extended temperature range make this part suited for harsh-environment deployments. Note that EPROM-based parts require a UV-erasable window for development; the equivalent PIC16F621A in Flash memory is generally preferred for new designs and prototypes. This page synthesizes current distributor pricing, parametric drop-in alternatives (PIC16C620A, PIC16C621), and practical design notes that go beyond the manufacturer datasheet to help engineers select and qualify the right part for production.

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PIC16C621A-04I/P - 8-Bit 4MHz OTP MCU 1.75KB | Microchip
PIC16C621A-04I/P

PIC16C621A-04I/P - 8-Bit 4MHz OTP MCU 1.75KB | Microchip

The Microchip PIC16C621A-04I/P is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4 MHz maximum operating frequency, 1.75 KB (1K x 14) of OTP program memory, and 96 bytes of RAM in a 18-pin PDIP through-hole package. It features 13 I/O pins, a powerful 200 ns instruction execution time, only 35 single-word instructions, and is rated for the industrial temperature range of -40C to +85C. An 8-bit microcontroller (MCU) is a programmable single-chip computer that integrates a CPU, RAM, non-volatile program storage, and I/O peripherals. The PIC16C family uses a RISC architecture, where each instruction executes in one instruction cycle (4 clock periods). One-time programmable (OTP) program memory is one-time-writable using a device programmer, making it suitable for low-to-medium volume production where firmware is finalized before assembly and where field re-programmability is not required. Key features include a 4 MHz internal oscillator option with selectable clock modes, a 14-bit wide instruction word optimized for compact code, a hardware USART/SCI, an analog comparator, and a watchdog timer for reliable operation in noisy industrial environments. The 13 bidirectional I/O pins can source/sink 25 mA per pin, allowing direct LED driving without external buffers. Compared to flash-based PIC16F alternatives, the OTP memory provides slightly tighter code security because bit-stream extraction from the device is not straightforward. Typical applications include appliance control boards, sensor signal conditioning, motor-driver front-ends, simple user-interface controllers, and white-goods replacement of discrete logic. The 18-pin PDIP package is breadboard-friendly and remains popular for engineering samples, university coursework, and legacy field service where through-hole rework is preferred over surface-mount. When designing with the PIC16C621A, ensure that MCLR is properly biased with a 10 kΩ pull-up and decoupling capacitors are placed within 5 mm of VDD/VSS. Programming the OTP memory requires a Microchip device programmer (such as the MPLAB PM3) because in-system programming is not supported on this OTP member of the PIC16C family.

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PIC16C621A-04I/SO - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip
PIC16C621A-04I/SO

PIC16C621A-04I/SO - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16C621A-04I/SO is an EPROM/OTP-based 8-bit CMOS microcontroller from the PIC16C6x mid-range family, delivering 4 MHz maximum CPU clock (200 ns instruction cycle) in an 18-pin SOIC wide package. It integrates 1.75 KB (1K x 14) of program memory, 96 bytes of RAM, 13 digital I/O pins, two analog comparators, and a 5-bit internal POR/Reset architecture in a single CMOS die. A microcontroller (MCU) is a single-chip computer that contains a CPU core, program memory, working RAM, and configurable I/O peripherals. The 8-bit PIC family uses a RISC Harvard architecture that separates program and data buses, allowing the CPU to fetch an instruction and a data operand in a single 200 ns cycle. This MCU category sits inside the broader microcontroller hierarchy: PIC mid-range -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. Mid-range PIC16C parts are typically used where predictable real-time response and ultra-low cost are more important than raw throughput. Key features include a wide 2.5 V to 5.5 V operating range, two on-chip analog comparators with programmable reference, an internal/external oscillator option, a 5-level hardware stack, and a 14-bit instruction set with only 35 single-word instructions. The /I suffix denotes the industrial temperature grade (-40 C to +85 C), and the /SO package designation specifies the 18-pin SOIC wide (300 mil) footprint supplied in tube packaging. The '04' designator marks the 4 MHz speed grade. Architecturally, the device uses an enhanced mid-range core with separate program and data buses, an 8-bit ALU, and 8-level deep hardware stack for subroutine calls. Power management is supported by a wide Vdd range and a low-power Sleep mode with multiple wake-up sources (watchdog timer, external interrupt, comparators, and port change). The comparator peripheral provides direct analog signal conditioning without an external op-amp, simplifying designs that need threshold detection or zero-crossing sensing. Typical applications include blood-pressure monitors, smoke detectors, consumer appliances, battery chargers, security panels, and general-purpose analog-front-end embedded controls. The internal comparators make it a good fit for sensor-threshold systems where an external ADC is unnecessary. When designing with this MCU, plan for the OTP (one-time-programmable) memory limitation: code must be perfect before programming because the program memory cannot be erased and rewritten. For development, use a flash-based sibling (PIC16F62x) or a windowed ceramic package for iterative code work. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C621A-04I/SS - 8-Bit 4MHz OTP MCU, 1.75KB | Microchip
PIC16C621A-04I/SS

PIC16C621A-04I/SS - 8-Bit 4MHz OTP MCU, 1.75KB | Microchip

The Microchip PIC16C621A-04I/SS is an 8-bit CMOS EPROM/OTP-based microcontroller in the PIC16 family, running at 4 MHz instruction cycle, with 1.75 KB (1K x 14) of OTP program memory and 96 bytes of RAM, housed in a 20-pin SSOP package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals. The PIC16C family uses a RISC (Reduced Instruction Set Computer) architecture with only 35 single-word instructions, executed in 200 ns at 4 MHz (4 MHz oscillator) or as fast as 100 ns at higher speeds. The 'C' in PIC16C designates one-time-programmable (OTP) EPROM program memory, while the 'A' suffix denotes the second-generation silicon. OTP allows the device to be programmed once with application firmware using a device programmer, then locked for production use. As an EPROM technology, the PIC16C621A is intended for prototyping, low-volume production, and legacy designs where flash-based PIC16F parts have not yet been qualified. Key features include 13 digital I/O pins, 2 analog comparators, a watchdog timer, power-on reset, brown-out detection, and an internal 4 MHz RC oscillator option. The wide 2.5 V to 6.0 V operating voltage range and -40 °C to +85 °C industrial temperature grade allow deployment in harsh embedded environments. Low-power operation is supported with typical current of 15 µA at 5 V / 4 MHz and 1 µA at 3 V / 32 kHz, making the PIC16C621A attractive for power-sensitive designs. The PIC16C621A architecture pairs the PIC RISC core with dedicated peripheral modules including two on-chip analog comparators that can be combined with external passive components for ADC-style signal conditioning, plus a Timer0 8-bit counter/timer with programmable prescaler. The 14-bit instruction word is wider than typical 8-bit MCUs, providing constant opcodes that execute in a single cycle. Typical applications include industrial control logic, sensor signal conditioning using the on-chip comparators, automotive body electronics subsystems, appliance control boards, and legacy embedded systems migrating from the original PIC16C621 (the A-suffix is the recommended replacement per Microchip migration document 41122B). When designing with this part, choose the OTP variant for low-volume or legacy-validated designs; for higher-volume or field-reprogrammable needs, evaluate flash-based PIC16F621 or PIC16F628A equivalents that share the same SSOP-20 pinout. The device requires a programmer such as the MPLAB PM3 or PICkit 2/3 to load OTP firmware. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C621A-20/SO - 8-Bit 20MHz OTP MCU 1.75KB | Microchip
PIC16C621A-20/SO

PIC16C621A-20/SO - 8-Bit 20MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16C621A-20/SO is an 8-bit CMOS microcontroller built on the PIC16C architecture, featuring 20 MHz maximum clock speed, 1.75 KB (1K x 14) of One-Time-Programmable (OTP) program memory, 96 bytes of RAM, and 13 digital I/O lines, all housed in an 18-pin SOIC package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, and peripheral interfaces such as timers, comparators, and I/O ports. The PIC16C621A sits in the PIC16C family of OTP-based mid-range microcontrollers, a category below flash-based PIC16F parts in reprogrammability but above baseline PIC10/12/16 devices in peripheral integration. OTP means the program memory is written once and is not erasable, making the part suited to production-run embedded control where firmware is finalized before manufacture. Key features include a 14-bit instruction word, 35 single-word instructions, 100 ns instruction execution at 20 MHz, two analog comparators with programmable reference, a Watchdog Timer with its own on-chip RC oscillator, and brown-out reset support. The device operates from 2.5V to 6.0V across commercial 0C to +70C temperature range, drawing low operating current suitable for battery-influenced designs. Internal oscillator and power-on reset circuitry minimize external component count. Architecturally, the PIC16C621A separates program and data memory (Harvard architecture), allowing simultaneous instruction fetch and data access for deterministic throughput. The RISC-style core achieves 200 ns instruction cycles at 20 MHz oscillator (one instruction cycle per four oscillator clocks), enabling responsive control loops in motor, power, and sensor applications without DSP-class complexity. Typical applications include appliance control, sensor signal conditioning, low-cost motor drivers, security alarm panels, and small consumer electronics. The integrated comparators make it well suited to threshold detection and battery monitoring. The PIC16C621A-20/SO is the surface-mount SOIC-18 variant of the family for commercial-temperature applications. When designing with this device, account for OTP programming: firmware must be fully verified before production programming, since OTP cannot be re-written. Use the MCLR, WDT, and POR features together for reliable reset behavior in noisy industrial environments. This page synthesizes distributor pricing, drop-in package equivalents, and design considerations not found on a single manufacturer or distributor datasheet page, giving procurement and engineering teams a single reference for evaluating the PIC16C621A-20/SO.

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PIC16C621A-20E/SS - 8-Bit 20MHz 1.75KB OTP MCU | Microchip
PIC16C621A-20E/SS

PIC16C621A-20E/SS - 8-Bit 20MHz 1.75KB OTP MCU | Microchip

The Microchip Technology PIC16C621A-20E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering up to 20 MHz operation (200 ns instruction cycle), 1.75 KB of OTP program memory (1K x 14), and 96 bytes of RAM, housed in a 20-pin SSOP package. It features 13 digital I/O pins, two analog comparators, and a wide 2.5 V to 5.5 V operating range, making it a versatile general-purpose MCU for industrial, automotive, and consumer designs. An 8-bit microcontroller is a single-chip computer that integrates a CPU, memory, and peripherals on one die; in the broader hierarchy it sits within microcontrollers, which in turn belong to integrated circuits and the semiconductor category. The PIC16C621A family targets cost-sensitive embedded applications where deterministic instruction execution and small code size outweigh the need for large memory. Built on Microchip's original PIC RISC architecture with only 35 single-word instructions, this MCU is also exceptionally easy to program. Key features include 100 ns instruction execution time, 13 I/O pins with individual direction control, two on-chip analog comparators with configurable reference, an internal watchdog timer, power-on reset, and brown-out detection. The device supports in-circuit serial programming (ICSP) via RB6/RB7, allowing firmware updates without removing the part from the board. The PIC16C621A architecture uses a Harvard-style design with separate program and data buses, enabling simultaneous instruction fetch and operand access. The 14-bit wide instruction word improves code density compared to 12-bit PIC cores, while the OTP EPROM memory allows fast prototype-to-production transitions on the same die. The comparator module can wake the part from Sleep, enabling ultra-low standby power in battery-fed designs. Typical applications include appliance control panels, automotive sensor interfaces, HVAC fan controllers, battery chargers, and simple human-machine interface boards. The wide operating temperature range makes it suitable for both commercial and industrial environments. When designing with the PIC16C621A-20E/SS, ensure VDD decoupling uses a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin, and keep the MCLR pin pulled high through a 10 kohm resistor to avoid spurious resets. The Extended (E) temperature grade supports -40 C to +125 C operation, so the part is appropriate for automotive and industrial deployments. This page synthesizes current distributor pricing, drop-in alternatives from Microchip's 20-pin SSOP PIC family, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16C621A-20I/SO - 8-bit OTP MCU 1.75KB EPROM 20MHz | Microchip
PIC16C621A-20I/SO

PIC16C621A-20I/SO - 8-bit OTP MCU 1.75KB EPROM 20MHz | Microchip

The Microchip Technology PIC16C621A-20I/SO is an 8-bit CMOS OTP-based RISC microcontroller from the PIC16C62X family, featuring 1.75KB (1K x 14) of one-time-programmable program memory, 96 bytes of RAM, and 13 digital I/O pins. The device runs at up to 20MHz clock speed with a 100 ns instruction execution time, integrates two on-chip analog comparators, and is housed in an 18-pin SOIC (SO) wide-body package suitable for industrial-temperature operation from -40C to +85C. According to the Microchip PIC16C621A datasheet, this part operates from 2.5V to 5.5V, making it compatible with both 3.3V and 5V system rails, and delivers 35 single-word instructions for compact, deterministic embedded code. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals such as timers, comparators, and I/O. The PIC16C621A belongs to the PIC16C family of OTP microcontrollers, which sit in the hierarchy of microcontrollers > 8-bit MCUs > PIC16C family > PIC16C62X sub-family > CMOS OTP-based RISC microcontrollers. OTP devices are programmed once and retain code for the life of the part, which is a cost-optimized choice for high-volume, stable-firmware products. Key features include 1.75KB EPROM program memory, 96 bytes of static RAM, two on-chip analog comparators with programmable reference, a watchdog timer, power-on reset, brown-out reset, and 13 bidirectional I/O pins with individual direction control. The Harvard RISC architecture separates program and data buses, allowing simultaneous instruction fetch and operand access for predictable cycle-time behavior. The 8-bit core, 14-bit instruction word, and 35-instruction set simplify code generation in MPLAB and the legacy PIC assembler toolchains. Typical applications span industrial control logic, appliance controllers, sensor signal conditioning front-ends, low-cost remote controls, security keypads, simple user-interface boards, and replacement of 555-timer glue logic with programmable timing sequences. For designers choosing between this part and its flash-based PIC16F or PIC16C cousins, the trade-off is one-time programmability versus in-system reprogrammability; the PIC16C621A is preferred where code stability, lower unit cost, and code-protection via OTP are acceptable.

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PIC16C621A-40/P - 8-bit OTP MCU, 1.75KB, 40MHz | Microchip
PIC16C621A-40/P

PIC16C621A-40/P - 8-bit OTP MCU, 1.75KB, 40MHz | Microchip

The Microchip Technology PIC16C621A-40/P is an 8-bit CMOS OTP-based microcontroller from the PIC16 family, featuring 100 nanosecond instruction execution, 35 single-word instructions, 1.75KB of program memory, 96 bytes of RAM, and 13 I/O pins, housed in an 18-pin PDIP package. It supports up to 40 MHz clock input and operates across the standard 2.5V–5.5V commercial voltage range used by the PIC16C62X series, making it suitable for legacy embedded control systems. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), working RAM, and programmable I/O peripherals on one die. OTP (One-Time Programmable) MCUs use EPROM cells that can be programmed exactly once and cannot be erased, which lowers die cost versus Flash parts but rules out field firmware updates. PIC MCUs employ a Harvard RISC architecture with separate program and data buses, allowing most instructions to execute in a single instruction cycle — which is the architectural source of the PIC16C621A's 100 ns execution time at 40 MHz. Key features include 1.75KB (typically 2K x 14 bit) of OTP program memory, 96 bytes of RAM, two 8-bit timers (Timer0, Timer2) plus one 16-bit timer (Timer1), an analog comparator module, and a 13-bit-wide I/O port. The 40 speed grade corresponds to a 40 MHz maximum oscillator frequency. The 18-pin PDIP package is a through-hole format preferred for prototyping, hobby projects, and legacy industrial controls where socketed replacement is desirable. The PIC16C621A uses a 14-bit instruction word and an 8-bit data path. Code protection is selectable via configuration bits, which fuse specific EPROM cells at programming time. The device includes a power-on reset (POR), brown-out detect (BOD), watchdog timer (WDT), and an in-circuit serial programming (ICSP) interface exposed on dedicated pins. Typical applications include appliance control, simple sensor signal conditioning with analog comparator, motor-driver logic interfaces, low-cost industrial timer/counter modules, and replacement of legacy 18-pin PIC16C5X designs. The PDIP package is also widely used in educational lab kits and DIY hobby electronics where hand-soldering and breadboard compatibility matter more than SMT density. When designing with this part, note that OTP memory means firmware must be validated before programming — there is no second chance. Decoupling (100 nF ceramic at VDD) and a stable clock source (crystal, resonator, or external clock) are required. Code-protect fuses should be enabled for production units to prevent firmware readout. This page synthesizes verified distributor pricing, drop-in alternatives from the same PIC16C6XX family, and practical design notes not consolidated in the manufacturer datasheet alone.

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PIC16C621AT-04/SS - 4MHz 8-Bit OTP MCU 1.75KB | Microchip
PIC16C621AT-04/SS

PIC16C621AT-04/SS - 4MHz 8-Bit OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16C621AT-04/SS is an 8-bit RISC CMOS microcontroller from the PIC16C family featuring 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory, 96 bytes of RAM, and 13 general-purpose I/O pins, housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch. It executes instructions at a maximum clock rate of 4MHz, supports operating voltages of 3.0V to 6.0V, and is specified for the commercial 0C to +70C temperature range. An OTP microcontroller is a type of embedded controller whose program memory can be written exactly once by the user via a programmer device, after which the code becomes permanent and cannot be erased or rewritten. Compared to UV-erasable EPROM MCUs, OTP variants offer lower per-unit cost and faster programming cycles, making them suited to high-volume production of fixed-function appliances. Within the broader taxonomy, the PIC16C621A is a member of the PIC16C mid-range family, itself a subfamily of Microchip's 8-bit PIC architecture, which sits under the umbrella of embedded microcontrollers and semiconductors. Key features include 35 instructions at 200ns per instruction cycle (4MHz oscillator, divide-by-4), a 14-bit instruction word, two 8-bit timer/counters (Timer0 and Timer2), a Watchdog Timer with its own on-chip RC oscillator, power-on reset, power-saving SLEEP mode, programmable code protection, and selectable oscillator options (RC, LP, XT, HS). The 13 I/O pins support independent direction control and direct LED drive capability. Typical applications span consumer white goods, automotive body electronics (non-safety), low-end security keypads, small appliance controllers, sensor signal conditioners, and battery-powered remote controls. The wide 3.0V-6.0V operating range simplifies integration with both 3.3V and 5V system rails. Industrial designers favor this part for its deterministic interrupt latency, breadboard-friendly SSOP footprint, and mature toolchain support through MPLAB IDE. When designing with the PIC16C621AT-04/SS, ensure the chosen oscillator mode matches the external crystal or resonator network specified in the datasheet oscillator configuration tables. Decouple VDD with a 100nF ceramic capacitor placed within 5mm of the supply pin, and connect the MCLR/VPP pin through a 10kohm pull-up to VDD for normal operation while reserving programming access via the ICSP header. This page synthesizes distributor pricing snapshots from DigiKey, Mouser, and LCSC, drop-in same-package alternatives in the PIC16C620A/PIC16C621A family, and practical design notes that go beyond the manufacturer datasheet.

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PIC16C621AT-04I/SS - 4MHz 8-bit OTP MCU 1.75KB Flash | Microchip
PIC16C621AT-04I/SS

PIC16C621AT-04I/SS - 4MHz 8-bit OTP MCU 1.75KB Flash | Microchip

The Microchip PIC16C621AT-04I/SS is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC® 16C family, operating at up to 4 MHz with 1.75KB (1K x 14) of program memory and 96 bytes of RAM in a 20-pin SSOP package. An 8-bit microcontroller (MCU) is a single-chip computer integrating an 8-bit CPU core, program memory (ROM/EPROM/Flash/OTP), data RAM, working registers, and configurable I/O peripherals. The PIC16C621A belongs to the Microchip mid-range family — sitting in the hierarchy: PIC microcontroller -> 8-bit MCU -> mid-range PIC16C series -> OTP CMOS PIC -> embedded controller -> semiconductor. This category is widely used for cost-sensitive, deterministic real-time control in appliances, automotive subsystems, and industrial equipment. The device delivers 13 digital I/O pins, two analog comparators, a 4 MHz internal clock option, and 25 mA source/sink per I/O for direct LED drive. It operates from 2.5 V to 5.5 V across the industrial -40 °C to +85 °C range. The architecture uses a 14-bit instruction word, a 200 ns instruction cycle at 20 MHz equivalent throughput, and Harvard bus separation. The -04I/SS suffix indicates a 4 MHz speed grade, industrial temperature range, and SSOP packaging. Typical applications include appliance control boards, security and alarm panels, automotive body electronics, low-end remote controls, and sensor interface modules. Engineers select this part when a low-cost, deterministic controller with on-board analog comparators is required and the firmware will not change after programming. When designing, place decoupling capacitors (100 nF plus 10 µF) within 5 mm of VDD/VSS, observe ESD precautions on unterminated I/O lines, and verify that program timing fits within the device's 1 K instruction budget. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found on a single distributor page.

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PIC16C621AT-20/SS - 8-Bit OTP MCU, 20MHz, 1.75KB | Microchip
PIC16C621AT-20/SS

PIC16C621AT-20/SS - 8-Bit OTP MCU, 20MHz, 1.75KB | Microchip

The Microchip PIC16C621AT-20/SS is a 8-bit RISC CMOS OTP microcontroller in the PIC16C621A family, delivering 20 MIPS performance from a 20 MHz oscillator in a 20-pin SSOP (5.30 mm) package. It integrates 1.75 KB of OTP program memory (1K x 14 words), 80 bytes of RAM, and 64 bytes of EEPROM data memory on-chip, plus a 5-channel 8-bit ADC for analog signal acquisition. The device operates across 2.5 V to 5.5 V, making it compatible with both 3.3 V and 5 V rails. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals to execute embedded firmware in real time. The PIC16C621A series belongs to the mid-range PIC family, sitting in the broader taxonomy: microcontroller -> embedded MCU -> 8-bit RISC processor -> CMOS semiconductor. OTP (One-Time Programmable) memory is programmed once and retained permanently, which makes these parts cost-effective for high-volume mature products where firmware is fixed and field updates are not required. Key features include an external oscillator interface (crystal/RC/resonator), two 8-bit timers plus one 16-bit timer, a watchdog timer with on-chip RC oscillator for reliable brown-out recovery, in-circuit serial programming (ICSP) capability, and 13 digital I/O pins with programmable weak pull-ups. The SSOP-20 footprint is industry-standard for through-hole-replacement SMD designs, with a body width of 5.30 mm suitable for compact industrial and consumer assemblies. The PIC16C621AT-20/SS uses a Harvard-architecture RISC core with a 14-bit instruction word and single-cycle execution for most op-codes, achieving near 1:1 MIPS-to-MHz efficiency. The integrated ADC with 5 channels enables direct connection of analog sensors without external multiplexing, while the on-chip EEPROM supports non-volatile parameter storage across power cycles. Typical applications include appliance control boards, simple sensor interfaces, motor and relay drivers, low-cost remote controls, and white-goods user-interface panels. The 20 MHz clock supports time-critical sequencing in motor-control and instrumentation loops. Designers should provide adequate decoupling (100 nF ceramic at VDD) and follow Microchip's recommended oscillator layout to avoid start-up failures. The OTP variant cannot be re-programmed; prototypes and field-updatable designs should consider the Flash-based PIC16F621A equivalent instead. This page consolidates distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet, supporting both procurement and engineering decisions for cost-sensitive 8-bit embedded designs.

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PIC16C621AT-20E/SO - 8-Bit 20MHz OTP MCU, 1.75KB, 13 I/O | Microchip
PIC16C621AT-20E/SO

PIC16C621AT-20E/SO - 8-Bit 20MHz OTP MCU, 1.75KB, 13 I/O | Microchip

The Microchip Technology PIC16C621AT-20E/SO is a member of the PIC16C62x family of 8-bit CMOS microcontrollers based on the enhanced Mid-Range RISC architecture, offering 20 MHz operation, 1.75 KB (1K x 14) of One-Time-Programmable (OTP) program memory, and 96 bytes of RAM in an 18-pin SOIC package. The 'T' suffix denotes tape-and-reel packaging, '20' indicates 20 MHz maximum clock, 'E' designates the Extended industrial temperature range (-40C to +125C), and 'SO' specifies the 18-lead Small Outline IC package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, and peripherals onto one silicon die, forming the lowest tier of the embedded processor taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The PIC16C62x series specifically targets cost-sensitive applications that need precise timing, low power, and a small footprint, while offering analog comparators and capture/compare/PWM peripherals typically absent from simpler 8-bit parts. Key features include 35 single-word instructions with 200 ns instruction cycle at 20 MHz, 14-bit wide instructions for compact code, two analog comparators with programmable on-chip voltage reference, one 8-bit timer/counter (TMR0) with an 8-bit prescaler, one 16-bit timer/counter (TMR1), a Watchdog Timer with its own on-chip RC oscillator for reliable operation, and thirteen digital I/O pins with high-current sink/source capability. The CMOS OTP process delivers low power consumption typical of PIC mid-range parts. Architecturally, the PIC16C621A uses a Harvard-style memory map with separate program and data buses, an 8-level deep hardware stack, and direct/indirect addressing modes. The Enhanced Mid-Range core introduces interrupt handling improvements and additional peripheral control registers compared to the original PIC16C5x baseline, while preserving instruction-set compatibility for migration of legacy code bases. Typical applications include automotive body electronics and sensor interfaces, white goods and appliance controls, industrial sensors and simple closed-loop regulators, low-end security panels, battery chargers, and consumer remote controls. The PIC16C621A is widely used in designs originally prototyped on the PIC16C621, where the 'A' silicon revision and OTP program memory offered a balance of cost, code security, and field upgradability. When designing with this part, observe the Extended temperature range rating of -40C to +125C for automotive under-hood or industrial environments, and ensure the supply voltage stays within the 3.0 V to 5.5 V range. OTP memory cannot be re-programmed, so plan code development on a windowed or flash equivalent (e.g., PIC16F62x) before committing to the OTP device for production. This page synthesizes current distributor pricing, drop-in same-family alternatives from the Site MPN catalog, and practical engineering guidance not consolidated in the manufacturer datasheet, helping engineers evaluate the PIC16C621AT-20E/SO against its 16C62x siblings and modern flash-based replacements.

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PIC16C621AT-20I/SO - 8-Bit 20MHz OTP MCU | Microchip | 18-SOIC
PIC16C621AT-20I/SO

PIC16C621AT-20I/SO - 8-Bit 20MHz OTP MCU | Microchip | 18-SOIC

The Microchip Technology PIC16C621AT-20I/SO is a PIC® 16C family 8-bit CMOS OTP-based microcontroller executing instructions in 100 nanoseconds from a 20 MHz oscillator, housed in an 18-pin SOIC (SO) wide-body surface-mount package supplied on tape and reel. The device integrates 1.75 KB (1K x 14) of OTP program memory, 96 bytes of RAM, 13 general-purpose digital I/O segments, a 5-channel 8-bit analog-to-digital converter, two analog comparators with programmable on-chip voltage reference, and a 16-bit timer/counter (TMR1) for capture/compare workloads. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral set into one package; the PIC16C family is built on Microchip's RISC-based Harvard architecture, where the program bus (14 bits wide) is separated from the data bus (8 bits wide) so each instruction can be fetched in one cycle. Within the broader taxonomy, this places the PIC16C621A under 8-bit MCU -> microcontroller -> embedded controller -> semiconductor device, making it a foundational building block for embedded applications that require deterministic timing and low part count. Key differentiating features include 35 single-word instructions (vs 80-200 on competing CISC architectures) which shortens the learning curve, an integrated analog comparator block that eliminates external op-amp stages, and an on-chip programmable voltage reference for analog signal conditioning. The OTP memory is one-time programmable, allowing final firmware to be locked in production without the cost of windowed or UV-erasable parts. Typical applications include appliance control boards, HVAC zone controllers, simple motor-control peripherals, security sensor interfaces, automotive interior modules, and industrial timer/counter front-ends. The 20 MHz clock supports instruction-cycle-sensitive protocols and tight control loops where deterministic execution latency matters more than raw throughput. When designing with this part, evaluate the OTP memory limitation before committing to firmware: any field update or code revision requires a new device. The wide-body 18-SOIC footprint eases hand prototyping and rework versus the SSOP variant. This page synthesizes distributor pricing, drop-in same-package alternatives, and engineering design notes not found in the Microchip datasheet, providing actionable information for component selection and supply-chain risk assessment.

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PIC16C621AT-20I/SS - 8-Bit 20MHz OTP MCU, 1.75KB | Microchip
PIC16C621AT-20I/SS

PIC16C621AT-20I/SS - 8-Bit 20MHz OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16C621AT-20I/SS is an 8-bit CMOS EPROM/OTP-based microcontroller from the PIC16C62x family, delivering 20 MHz instruction execution in a 20-pin SSOP package. The device integrates 1.75 KB (1K x 14) of OTP program memory, 96 bytes of RAM, and 13 I/O pins, operating from a 2.5 V to 5.5 V supply across the industrial -40 C to +85 C temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that combines an 8-bit CPU, program memory, data RAM, and peripheral I/O on one die. PIC microcontrollers use a RISC Harvard architecture with separate program and data buses, allowing instruction fetch and operand read in a single cycle. The PIC16C62x family sits at the entry-level of Microchip's mid-range PIC16 lineup, designed for compact, cost-sensitive embedded control where deterministic timing, low pin count, and small code footprint matter more than raw throughput. The PIC16C621A core executes 35 single-word instructions in 200 ns at 20 MHz (100 ns instruction cycle at 20 MHz oscillator). On-chip peripherals include an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a Watchdog Timer with its own on-chip RC oscillator for reliable reset, and a 16-bit Capture/Compare/PWM (CCP) module. Two comparators with programmable reference are integrated for analog signal conditioning, eliminating the need for external op-amps in threshold-detection circuits. The device supports in-circuit serial programming (ICSP) through RB6 and RB7, enabling field updates without removing the part from the board. Typical applications include low-cost consumer appliances, security keypads, automotive body electronics sub-modules, sensor interfaces, and battery-powered instrument controllers where the on-chip comparators handle analog thresholding. The 20-SSOP footprint is pin-compatible with several PIC16C62x, PIC16C55x, and PIC16F family devices, allowing a single PCB layout to support multiple firmware variants or migration to flash-based PIC16F parts for prototype-to-production flexibility. When designing with the PIC16C621A, note that OTP memory is one-time programmable, so firmware must be fully validated before programming. Choose the 'T' tape-and-reel suffix for production volumes and the 'I' industrial temperature grade for -40 C to +85 C operation. Migrating to a flash-based PIC16F621 or PIC16F628 in the same 20-SSOP footprint gives rework capability at the cost of higher unit price. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C621AT-40/SO - 8-Bit 40MHz OTP MCU 1.75KB | Microchip
PIC16C621AT-40/SO

PIC16C621AT-40/SO - 8-Bit 40MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16C621AT-40/SO is an 8-bit CMOS RISC microcontroller from the PIC16C family featuring 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory, 96 bytes of RAM, and 13 general-purpose I/O pins. The device executes instructions at a maximum clock rate of 40MHz, delivering up to 10 MIPS throughput, and is housed in a surface-mount 18-pin SOIC (7.50 mm width) package. A factory-programmed tape-and-reel suffix (-T) identifies the shipping orientation. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and peripheral I/O on a single silicon die. The PIC16C family uses a Harvard architecture, which separates program and data buses so the CPU can fetch an instruction while simultaneously reading or writing data. This 8-bit class sits at the entry level of Microchip's PIC portfolio, bridging simple 6-pin baseline parts and the 16-bit dsPIC/PIC24 devices; the family hierarchy is: 8-bit MCU -> RISC MCU -> embedded microcontroller -> semiconductor IC. Key features include 1024 words of OTPROM, a 14-bit instruction word, 8-level hardware stack, 8-bit timer/counter with 8-bit prescaler, watchdog timer, power-on reset, brown-out reset, and a 5-channel 8-bit ADC on the analog-enabled variants. The part supports in-circuit serial programming (ICSP) for OTP programming before final encapsulation, since OTP memory cannot be erased. The PIC16C621A architecture combines an 8-bit ALU with a 14-bit instruction set optimized for compiled C and assembler code density. Internal peripherals include PORTA/B digital I/O, an analog comparator block (two on-chip comparators), and interrupt logic with context saving. The CMOS process yields a low-power design with quiescent current typically below 2 mA in active mode and microampere-range sleep currents. Typical applications include appliance control, security panels, automotive body electronics, sensor conditioning, low-end motor control, and white-goods user interfaces. Industrial control boards, HVAC zone controllers, and battery-powered instrumentation also leverage this part. When designing, ensure Vdd stays within 3.0V to 5.5V (commercial) or 3.0V to 6.0V (extended), place a 100 nF decoupling capacitor within 5 mm of Vdd, and reserve the MCLR pin for proper reset unless internal WDT reset is enabled. OTP memory means firmware must be perfect before programming. This page synthesizes distributor pricing, same-brand drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet.

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PIC16C621T-04/SO - 8-Bit 4MHz 1.75KB OTP MCU 18-SOIC | Microchip
PIC16C621T-04/SO

PIC16C621T-04/SO - 8-Bit 4MHz 1.75KB OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16C621T-04/SO is an 8-bit RISC microcontroller from the PIC16C family, offering 4 MHz maximum clock speed, 1.75 KB (1K x 14) of One-Time-Programmable (OTP) program memory, 80 bytes of RAM, and 13 programmable I/O pins in an 18-pin SOIC package. The 'T' suffix denotes tape-and-reel packaging and the '04' suffix indicates the 4 MHz speed grade, while '/SO' specifies the 300-mil 18-lead Small Outline Integrated Circuit package. A PIC16C-series microcontroller belongs to the 8-bit microcontroller category (hypernym hierarchy: PIC16C -> PIC16 -> PIC -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC). It is a Harvard-architecture RISC device with separate program and data buses, optimized for deterministic real-time control and low-cost embedded designs where OTP memory provides cost-effective one-time code storage for mature, fixed-function products. Key features of this part include 35 single-word instructions, a 14-bit instruction word, two 8-bit timer/counters, a watchdog timer, an internal 4 MHz RC oscillator option, and a wide 3.0 V to 6.0 V operating voltage range suitable for both 3.3 V and 5 V rails. The OTP program memory enables low-cost firmware storage while the 80-byte RAM footprint is sized for compact control loops. The 18-SOIC package offers a 300-mil body width for hand-solder-friendly prototyping and high-volume surface-mount assembly. The architecture uses a 14-bit instruction set with most instructions executing in a single instruction cycle (4 oscillator clocks), giving an effective throughput of 1 MIPS at 4 MHz. Peripherals include a comparator module (the PIC16C621 variant includes dual comparators), programmable I/O with individual direction control, and power-on reset / brown-out detection support on selected family members. Typical applications include consumer appliance controls, simple sensor interfaces, automotive body electronics (non-safety), low-end motor control, and industrial control subsystems. The wide voltage tolerance allows direct 5 V operation from unregulated supplies. Note that the OTP nature means firmware cannot be updated in-circuit; flash-based PIC16F equivalents exist where in-system reprogrammability is required.

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PIC16C621T-04/SS - 8-Bit 4MHz OTP MCU, 1.75KB EPROM | Microchip
PIC16C621T-04/SS

PIC16C621T-04/SS - 8-Bit 4MHz OTP MCU, 1.75KB EPROM | Microchip

The Microchip Technology PIC16C621T-04/SS is an 8-bit RISC microcontroller from the PIC16C family, featuring 1.75KB (1K x 14) of One-Time Programmable (OTP) EPROM program memory, 80 bytes of RAM, and 13 general-purpose I/O pins, housed in a 20-pin SSOP (Shrink Small Outline Package) supplied on Tape and Reel. An OTP microcontroller is a type of embedded controller that stores its firmware in non-volatile memory that can be programmed exactly once after manufacture. The PIC16C621 belongs to the broader category of microcontrollers -> 8-bit microcontrollers -> RISC microcontrollers -> PIC microcontrollers -> PIC16C family -> semiconductor. It is fabricated on a CMOS process and operates from a 3.0V to 5.5V supply, supporting both 3.3V and 5V rails commonly found in industrial and consumer electronics. Key features include a maximum operating frequency of 4MHz, integrated Brown-out Detect/Reset (BOR), Power-On Reset (POR), and a Watchdog Timer (WDT) for system reliability. The device also includes two analog comparators that can be repurposed as additional digital I/O, providing design flexibility. The SSOP-20 footprint with 0.65mm pitch is a compact surface-mount package suitable for space-constrained designs. The PIC16C621T-04/SS uses Microchip's enhanced PIC16C5X core architecture with a 14-bit instruction word, providing 35 single-word instructions. The Harvard architecture separates program and data memory, allowing instruction fetch and execution to overlap in a two-stage pipeline. This delivers deterministic interrupt response, a hallmark of PIC microcontrollers used in real-time control. Typical applications include industrial control logic, sensor signal conditioning, low-power embedded systems, automotive body electronics (non-safety), and appliance control boards. The wide 3.0V to 5.5V operating range supports both battery-powered and mains-powered designs, while the integrated comparators simplify analog threshold detection without an external op-amp. When designing with this OTP part, note that firmware cannot be erased or rewritten. Designers should prototype with the flash-based PIC16F621 equivalent for development, then transition to the OTP PIC16C621 for production cost savings. Always allocate adequate decoupling (100nF ceramic) close to VDD and VSS pins. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, enabling faster sourcing decisions for engineers and procurement teams.

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