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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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PIC16C621T-04E/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip
PIC16C621T-04E/SS

PIC16C621T-04E/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C621T-04E/SS is an 8-bit EPROM-based CMOS microcontroller from the PIC® 16C family, delivering 4MHz maximum clock speed with 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory and 80 bytes of RAM. It is housed in a 20-pin SSOP package (0.209 inch / 5.30mm width) suitable for surface-mount assembly, with 13 general-purpose digital I/O pins. According to Microchip's PIC16C621 family datasheet, integrated peripherals include Brown-out Detect/Reset, Power-On Reset (POR), and a Watchdog Timer (WDT) for enhanced reliability in unattended or industrial environments. An 8-bit OTP microcontroller is a single-chip computer that stores its executable code in one-time-programmable EPROM, executes instructions from a Harvard-architecture RISC core, and provides configurable digital I/O plus on-chip peripherals. In the broader hierarchy, OTP MCUs sit between mask-ROM MCUs (lowest cost, factory programmed) and flash-based MCUs (reprogrammable in-circuit), and they belong to the microcontroller family, a subset of embedded processors within the power-management-aware semiconductor landscape. OTP parts are typically chosen for low-to-medium volume production where firmware is final but in-system reprogrammability is not required. Key features include 4MHz maximum operating frequency, 13 I/O pins with individual direction control, a programmable Watchdog Timer with on-chip RC oscillator, Brown-out Reset for low-voltage protection, and Power-On Reset. The device operates from a supply voltage range typical of the PIC16C family and supports commercial/industrial temperature grades. Compared to flash-based PIC16F counterparts, the PIC16C621 offers a lower-cost OTP programming path for mature, locked firmware designs. The PIC16C621 utilizes Microchip's classic PIC RISC architecture with a 14-bit instruction word and Harvard bus structure, providing deterministic instruction timing and a small, efficient code footprint. EPROM-based memory is well suited to long-term archival stability once programmed, and the integrated peripherals reduce external component count. The part is part of the legacy PIC16C62x sub-family, which has been superseded in new designs by flash-based PIC16F62x devices that retain pin compatibility. Typical applications include industrial automation controllers, consumer electronics user-interface modules, simple sensor signal-conditioning front-ends, and small appliance control boards. The 13 I/O pins and integrated reset/watchdog features make it suitable for stand-alone embedded controllers that must operate reliably with minimal external circuitry. The 20-SSOP package also supports compact PCB layouts in space-constrained designs. When designing with this part, note that OTP memory can be programmed only once; ensure firmware is fully validated before programming. Designers migrating to flash-based alternatives should consider the pin-compatible PIC16F62x family for prototyping. The 'T' suffix indicates tape-and-reel packaging, while 'E' denotes the extended temperature grade per Microchip's legacy nomenclature. This page synthesizes distributor pricing, lifecycle status, drop-in same-family alternatives, and practical design notes not found in a single manufacturer datasheet, providing engineers with a consolidated procurement and engineering reference for the PIC16C621T-04E/SS.

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PIC16C621T-04I/SO - 8-bit OTP MCU, 4MHz, 1.75KB | Microchip
PIC16C621T-04I/SO

PIC16C621T-04I/SO - 8-bit OTP MCU, 4MHz, 1.75KB | Microchip

The Microchip Technology PIC16C621T-04I/SO is an 8-bit RISC-based CMOS microcontroller from the PIC16C family, delivering 4MHz core performance with 1.75KB (1K x 14) of One-Time-Programmable (OTP) program memory in an 18-pin SOIC (SO) wide-body package. The '04' speed grade denotes a 4MHz oscillator variant, while the 'I' suffix indicates the industrial temperature range (-40C to +85C). The T/R suffix indicates tape-and-reel packaging. 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. It belongs to the broader hierarchy of microcontrollers -> embedded processors -> semiconductors, and serves as the central control element in countless embedded designs. The PIC16C family specifically uses a Harvard RISC architecture with 14-bit wide instruction words, optimizing code efficiency over pure data throughput. Key features include 80 bytes of RAM, 13 digital I/O pins, an integrated analog comparator module, internal watchdog timer, and 1,000,000 erase/write cycle endurance on the OTP program memory. The part operates from 3.0V to 6.0V supply voltage and supports both RC and crystal clock modes, enabling low-cost oscillator designs. Its 18-pin SOIC footprint places it in the small-outline surface-mount family (SOIC -> SMD -> SMT), suited for automated assembly. Architecturally, the PIC16C621 separates program memory (1K x 14 OTP) from data memory (80 bytes RAM plus a 7-byte common RAM area), accessed through separate buses. This Harvard approach allows instruction fetch and data access to occur simultaneously, accelerating execution. The integrated analog comparator with programmable reference voltage eliminates the need for an external analog front end in many applications. Typical applications include appliance control, security sensor interfaces, low-cost remote controls, smoke detectors, and small industrial controllers. The wide SOIC package and broad third-party tool support (MPLAB PM3, ICD programmers) make it easy to prototype and produce. Designers choose the PIC16C621 family for its mature ecosystem, deterministic instruction timing, and abundant reference designs from Microchip's application notes. When designing with the PIC16C621, configure the configuration fuses carefully, since OTP memory cannot be reprogrammed. Ensure decoupling capacitors are placed within 5mm of VDD/VSS pins, and follow Microchip's AN577 'PIC16C5X/XX Design Considerations' for brown-out and EMI guidance. Note that the 'T' suffix indicates tape-and-reel, important for high-volume SMT assembly. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C621T-20/SO - 8-Bit 20MHz OTP MCU 1.75KB | Microchip
PIC16C621T-20/SO

PIC16C621T-20/SO - 8-Bit 20MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16C621T-20/SO is an 8-bit RISC microcontroller from the PIC16C family, operating at up to 20MHz and housed in an 18-pin SOIC package supplied on Tape & Reel. It integrates 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory and 80 bytes of RAM, with 13 digital I/O pins, a Watchdog Timer, Power-On Reset, and Brown-out Detect/Reset. An OTP microcontroller is a CMOS device whose program memory can be written only once via a programming cycle - the bit cells use EPROM (erasable programmable read-only memory) technology that is electrically programmed but not UV-erasable. Once programmed, the firmware is permanent; this makes OTP parts ideal for cost-sensitive high-volume production where code is finalized before tooling. In the broader hierarchy, OTP MCUs sit between one-time-programmable EPROM-based devices and modern Flash-based MCUs (e.g., PIC16F) - they share the same PIC16C instruction set but are limited to a single programming event. Key features include a wide 3.0V to 6.0V operating voltage range, an internal oscillator option, low-power consumption, and CMOS RISC architecture with only 35 single-word instructions. The PIC16C core executes one instruction per instruction cycle (4 clock cycles), giving an effective throughput of 5 million instructions per second at 20MHz. Brown-out Detect/Reset and Power-On Reset combine to give reliable startup behavior in electrically noisy environments. The 18-pin SOIC (Small Outline Integrated Circuit) package is part of the SOIC family within surface-mount plastic packages and supports hand-soldering as well as standard reflow profiles. Compared to the 18-pin PDIP counterpart, the SOIC variant enables higher board density and lower assembly cost in automated SMT lines. Typical applications include industrial control logic, sensor signal conditioning, low-cost consumer appliances, automotive body electronics, and discrete replacement of TTL/CMOS glue logic. The combination of OTP code security, wide voltage range, and on-chip peripherals reduces external component count. When designing with the PIC16C621T-20/SO, note that OTP memory cannot be re-programmed - plan firmware revision strategy accordingly or consider the flash-based PIC16F621 for prototyping. Decoupling capacitors of 0.1uF should be placed as close as possible to VDD and VSS pins. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the PIC16C621T-20/SO not found in the manufacturer datasheet alone, including cross-package, cross-temperature, and same-family PIC16C620A/PIC16C622A migration paths.

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PIC16C621T-20E/SO - 8-Bit 20MHz OTP MCU, 1.75KB | Microchip
PIC16C621T-20E/SO

PIC16C621T-20E/SO - 8-Bit 20MHz OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16C621T-20E/SO is an 8-bit PIC microcontroller based on the PIC16C family RISC architecture, operating at up to 20 MHz with 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory and 80 x 8 bytes of RAM, housed in an 18-pin SOIC wide-body (0.295", 7.50 mm) package. Background Knowledge. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and peripheral interfaces. The PIC16C family uses a RISC (Reduced Instruction Set Computer) Harvard architecture with separate program and data buses. OTP program memory allows the device to be programmed once at production; for re-programmable Flash variants in the same pinout, designers typically migrate to the PIC16F or PIC16C62x equivalents. The 16C family sits inside the broader taxonomy: microcontroller -> embedded controller -> integrated circuit -> semiconductor. Key Features. Core/PIC16c621t-20e/so delivers 20 MHz maximum clock speed, 13 digital I/O pins, two 8-bit timers (TMR0 and TMR2 with prescaler), one analog comparator, a watchdog timer with on-chip RC oscillator, and an operating voltage range of 3.0 V to 6.0 V. The PIC16C621T-20E/SO operates over the extended temperature range of -40 C to +125 C. The wide-body 18-SOIC package is supplied on tape and reel (T/R) for surface-mount assembly. Technical Depth. The device executes most instructions in a single 200 ns cycle at 20 MHz. Its 14-bit instruction word and 8-bit data path are characteristic of the baseline-plus PIC16C6xx sub-family. Brown-out reset and power-on reset are supported; in-circuit serial programming (ICSP) is available via RB6/RB7 for production programming despite the OTP memory architecture. Typical Applications. The PIC16C621T-20E/SO suits industrial control, automotive body electronics, consumer appliances, security systems, and white-goods control boards requiring low-cost, fixed-function 8-bit control. Its -40 C to +125 C extended range allows deployment under-hood or in outdoor enclosures. Design Consideration. The OTP memory cannot be erased; for prototyping or field updates choose the Flash-based PIC16F62x pin-compatible variant. A decoupling capacitor of 0.1 uF must be placed within 5 mm of VDD. Unique Value. This page synthesizes distributor stock data, exact-spec drop-in alternates, and lifecycle context not aggregated on the manufacturer product page.

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PIC16C621T-20E/SS - 8-Bit 20MHz OTP MCU, 1.75KB | Microchip
PIC16C621T-20E/SS

PIC16C621T-20E/SS - 8-Bit 20MHz OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16C621T-20E/SS is an 8-bit CMOS OTP microcontroller from the PIC16C family, operating at up to 20 MHz with 1.75KB (1K x 14) of one-time programmable program memory and 80 bytes of data RAM, housed in a 20-pin SSOP package supplied on tape and reel. Headline parameters are 20 MHz maximum clock, 13 programmable I/O pins, and an operating voltage range of 3.0V to 6.0V, with on-chip peripherals including Brown-out Detect/Reset, Power-on Reset (POR), and a Watchdog Timer (WDT). A PIC (Peripheral Interface Controller) microcontroller is a compact 8-bit RISC processor designed by Microchip for embedded control applications. PIC16C-series parts belong to the mid-range family and follow the PIC -> 8-bit MCU -> microcontroller -> embedded processor taxonomy; the OTP variants (PIC16C, with a windowed UV-erasable cousin PIC16C) target cost-sensitive volume production where firmware is finalized before programming. These parts sit within the broader category of integrated circuits > microcontrollers > 8-bit microcontrollers. Key features of the PIC16C621T-20E/SS include 13 digital I/O pins with individual direction control, an external oscillator interface supporting crystal, resonator, or RC modes, a programmable WDT with its own on-chip RC oscillator, a power-on reset circuit, and brown-out reset for safe recovery from low-voltage transients. The Harvard RISC architecture provides single-cycle instructions (excluding branches), enabling deterministic interrupt latency. The 20-pin SSOP (Shrink Small Outline Package) reduces board area compared with standard SOIC while retaining hand-solderability and standard 1.27 mm pin pitch. Typical applications include industrial automation controllers, consumer appliance control boards, automotive body and chassis subsystems, sensor interface modules, and general-purpose embedded control where low cost, simple development, and small footprint are priorities. The 3.0V to 6.0V range covers both 3.3V and 5V supply rails common in legacy industrial designs. When designing with this part, note that OTP memory can be programmed only once, so firmware must be fully validated before production programming. The -40C to +125C operating range supports automotive and industrial environments, but designers migrating from the -04 or -20 base parts should verify oscillator and timing parameters against the PIC16C621 datasheet electrical characteristics table. This page synthesizes distributor pricing as of 2026-09-17, drop-in pin-compatible Microchip alternatives such as PIC16C621A and PIC16C620A, and practical design notes that complement the manufacturer datasheet.

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PIC16C621T-20I/SO - 8-Bit 20MHz OTP MCU 1.75KB | Microchip
PIC16C621T-20I/SO

PIC16C621T-20I/SO - 8-Bit 20MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16C621T-20I/SO is an 8-bit PIC16 microcontroller built on a RISC architecture, offering 20 MHz maximum clock speed, 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory and 80 bytes of data RAM, housed in an 18-pin SOIC wide-body package. The "I" suffix indicates the industrial operating temperature grade of -40C to +85C, while the "20" speed grade specifies 20 MHz operation and "T" denotes tape-and-reel packaging for high-volume assembly. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory and programmable I/O peripherals. The PIC16C family belongs to Microchip's mid-range 8-bit MCU portfolio, sitting in the taxonomy: PIC16C -> PIC16 mid-range -> 8-bit PIC microcontroller -> embedded MCU -> semiconductor. Mid-range PIC MCUs use a 14-bit instruction word and Harvard architecture, balancing code density, deterministic interrupt response and low cost for legacy industrial and consumer designs. Key features of the PIC16C621 include a built-in analog comparator, 13 digital I/O pins, a 16-bit timer/counter (Timer1) and an 8-bit timer/counter (Timer0), a Watchdog Timer with its own on-chip RC oscillator, Power-on Reset, Brown-out Reset, and an in-circuit serial programming (ICSP) interface for production-line code loading into the OTP memory. The 20 MHz oscillator provides a 200 ns instruction cycle, with most instructions completing in a single cycle. Typical applications include appliance control, sensor signal conditioning, LED driving, simple motor control loops, and replacement of discrete logic in legacy 8-bit embedded products. Industrial operating temperature makes it suitable for factory automation modules and outdoor metering. When designing with OTP memory, note that program code cannot be erased or rewritten - plan firmware revisions carefully or migrate to the flash-based PIC16F6xx family for design flexibility. The wide-body 18-SOIC (7.50 mm body width) provides better thermal and mechanical characteristics than the narrow 18-SOIC variant used on lower-pin-count PICs.

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PIC16C621T-20I/SS - 8-Bit 20MHz OTP MCU 1.75KB | Microchip
PIC16C621T-20I/SS

PIC16C621T-20I/SS - 8-Bit 20MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16C621T-20I/SS is a member of the PIC16C62x family of 8-bit CMOS microcontrollers based on the Microchip PIC architecture, featuring a 20 MHz maximum operating frequency, 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory, and 80 bytes of RAM in a 20-pin SSOP package. The integrated peripherals include a Watchdog Timer (WDT), Brown-Out Reset (BOR), Power-On Reset (POR), an analog comparator module, and a Capture/Compare/PWM (CCP) module, providing a self-contained control platform for embedded designs. The device operates across an industrial temperature range of -40C to +85C and supports a supply voltage range that is typical for the PIC16C OTP family. An 8-bit PIC microcontroller is a compact, deterministic Reduced Instruction Set Computer (RISC) core designed for embedded control. The PIC16C62x family sits in the hierarchy of PIC microcontrollers -> 8-bit microcontrollers -> microcontrollers -> microcontrollers (MCU) -> integrated circuits -> semiconductors, where it bridges the entry-level PIC10/12/16 families and the higher-performance PIC17/18 families. The OTP program memory allows the part to be programmed once in production and used in cost-sensitive applications where firmware is fully matured and field updates are not required. Key features include 13 digital I/O pins across multiple ports, support for an external oscillator or internal RC oscillator option, low-power SLEEP mode, an in-circuit serial programming interface (for compatible variants), and industrial-grade temperature qualification. The OTP memory architecture provides faster read access and higher reliability than EPROM in equivalent packages, while the SSOP form factor balances board-space savings with hand-solder-friendly lead pitch. Together, these features deliver a self-contained compute platform for low-cost embedded controllers. The PIC16C621T-20I/SS implements a Harvard-architecture RISC core with a 14-bit instruction word, single-cycle instruction execution (except branches), and a hardware stack for subroutine nesting. Its integrated analog comparator enables direct interface with analog sensors without external op-amps, while the CCP module supports timing-critical control loops such as motor drive and SMPS feedback. Industrial -40C to +85C qualification plus BOR/POR/WDT make this part suitable for unattended equipment. Typical applications include white-goods and appliance control, industrial sensor interfaces, low-cost motor control, automotive body electronics (non-safety), and consumer remote controls. The integrated analog comparator is particularly useful for threshold detection on temperature, light, or position sensors, while the CCP module drives PWM-controlled loads. When designing with this part, note that OTP devices cannot be re-programmed - confirm firmware stability before committing to OTP. The 'T' suffix denotes tape-and-reel packaging for high-volume SMT assembly, and the 'I' suffix designates the industrial temperature grade (-40C to +85C). This page synthesizes distributor pricing, drop-in alternatives drawn from the same PIC16C family, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C622-04/P - 4MHz 8-Bit CMOS OTP MCU 18-PDIP | Microchip
PIC16C622-04/P

PIC16C622-04/P - 4MHz 8-Bit CMOS OTP MCU 18-PDIP | Microchip

The Microchip Technology PIC16C622-04/P is an EPROM-based 8-bit CMOS microcontroller built on the PIC16C RISC architecture, delivering up to 4 MHz CPU clock in a 18-pin PDIP through-hole package. The device integrates 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory and 128 bytes of on-chip data RAM, supporting 13 general-purpose digital I/O pins. The "-04" speed suffix denotes the 4 MHz oscillator grade, while the "/P" suffix designates the plastic DIP package. According to the Microchip PIC16C62X datasheet family, the part operates across a wide 2.5 V to 6.0 V supply range (commercial temperature grade 0°C to +70°C) and consumes only 15 µA typical at 5 V/4 MHz and 1 µA typical at 3 V/32 kHz, making it well-suited to low-power embedded applications. 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 PIC16C622 belongs to the PIC16C family of OTP/EPROM microcontrollers from Microchip, sitting in the product hierarchy PIC16C62X -> PIC16C family -> 8-bit PIC microcontrollers -> microcontrollers -> integrated circuits. It is functionally a member of the same family as the PIC16C621 and PIC16C620, which differ mainly in program-memory size and feature integration while sharing a common core and pinout. Key features of the PIC16C622-04/P include 13 digital I/O lines, a watchdog timer for code-execution safety, a power-on reset (POR) circuit, an internal/external oscillator block, and EPROM-based program memory that is windowed for prototype development (in the JW package variant) or OTP for production. The device also integrates a programmable code-protection scheme, an 8-bit timer/counter, and on-chip brown-out / power-up timers commonly seen across the PIC16C62X series. Architecturally, the PIC16C622 uses a Harvard-style RISC core with a 14-bit instruction word and an 8-bit data path, fully static design allowing the oscillator to be stopped without losing register state, and CMOS EPROM technology for low active and standby current. The 4 MHz oscillator grade paired with the 200 ns instruction cycle (one-quarter of the clock period) provides deterministic interrupt latency, which is important for real-time control loops. Typical applications include appliance controllers, simple sensor interfaces, LED driver sequencers, hobby and educational hardware, and legacy embedded products where a 4 MHz 8-bit MCU is sufficient. The wide operating voltage range also allows direct connection to 3.3 V or 5 V rails in mixed-logic designs. When designing with this device, ensure OTP programming is done before final assembly because OTP cells cannot be erased after programming. Add a 0.1 µF decoupling capacitor close to VDD and bulk capacitance near the PCB power inlet to keep the internal POR / brown-out block stable during supply transients. This page synthesizes distributor pricing and stock, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single authoritative reference for PIC16C622-04/P selection and replacement.

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PIC16C622-04/SS - 8-bit OTP MCU, 3.5KB, 128B RAM | Microchip
PIC16C622-04/SS

PIC16C622-04/SS - 8-bit OTP MCU, 3.5KB, 128B RAM | Microchip

The Microchip PIC16C622-04/SS is an EPROM-based 8-bit CMOS microcontroller in a 20-pin SSOP package, running at up to 4 MHz from a 2.5V to 6.0V supply. It integrates 3.5KB (2K x 14) of one-time-programmable program memory, 128 bytes of RAM, and 13 digital I/O pins, making it a compact solution for cost-sensitive embedded control. What is an 8-bit OTP microcontroller? An 8-bit microcontroller is a small computer-on-a-chip built around an 8-bit data path and a RISC instruction set, optimized for deterministic real-time control. The OTP (one-time-programmable) variant uses EPROM program memory that can be written once during production and cannot be erased, lowering die cost versus flash parts. Within Microchip's portfolio, the PIC16C62x family belongs to the PIC16 mid-range architecture, sits between the baseline PIC10/12/16 families and the enhanced PIC18 family, and is part of the broader microcontroller (MCU) -> embedded IC -> semiconductor taxonomy. Key features include a 14-bit instruction word, hardware USART, capture/compare/PWM module, two 8-bit timers plus one 16-bit timer, a 5-channel 8-bit ADC, and an internal watchdog timer. Low-power consumption is rated at 15 µA typical at 5V / 4 MHz and 1 µA typical at 3V / 32 kHz, allowing battery-friendly standby operation. The device is fully static and supports DC to 4 MHz operation across commercial, industrial, and extended temperature ranges. The PIC16C622-04/SS uses Microchip's mid-range RISC core with a hardware multiplier-free architecture, dual clock domains, and on-chip oscillator options for RC, LP, XT, and HS modes. The '04' speed suffix denotes a 4 MHz maximum oscillator frequency, while the 'I' industrial temperature variant covers -40C to +85C. Typical applications include small appliance controls, sensor signal conditioning, IR remote receivers, simple motor drivers, and low-cost consumer electronics. Industrial uses span HVAC damper controls, security keypads, and metering front-ends where deterministic interrupt response and small form factor matter. When designing with this part, remember OTP memory cannot be re-programmed in-circuit - prototype firmware must be validated on a windowed PIC16C622 JW or a flash-equivalent PIC16F628 before committing to OTP. Use decoupling capacitors of 0.1 µF ceramic on VDD and place the ICSP clock/data pins away from high-current traces. This page synthesizes distributor stock, parametric pricing, and engineering-grade cross-reference data not found in the manufacturer datasheet, enabling faster sourcing and design decisions.

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PIC16C622-04E/P - 8-bit CMOS MCU, 3.5KB OTP, 4MHz | Microchip
PIC16C622-04E/P

PIC16C622-04E/P - 8-bit CMOS MCU, 3.5KB OTP, 4MHz | Microchip

The Microchip Technology PIC16C622-04E/P is an EPROM-based 8-bit CMOS microcontroller delivering 4 MIPS performance at 4 MHz in a 18-pin PDIP through-hole package. The device integrates 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 digital I/O pins, providing a compact control platform for embedded applications requiring UV-erasable, windowed-style development flows or factory-programmed OTP deployment. The 04E speed grade designation specifies a 4 MHz oscillator input and an Extended operating temperature range of -40°C to +125°C, making the part suitable for industrial and harsh-environment installations. An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, program memory, data RAM, and programmable peripherals on one silicon die. Within the broader taxonomy, MCUs belong to microprocessors, which fall under semiconductors, which are classified as integrated circuits. The PIC16C family from Microchip uses a RISC (Reduced Instruction Set Computer) Harvard architecture with a separate program and data bus, enabling single-cycle instruction execution and deterministic interrupt response for real-time control loops. Key features of the PIC16C622-04E/P include a wide operating voltage range of 2.5 V to 6.0 V, ultra-low power consumption of 15 µA typical at 5 V and 4 MHz and 1 µA typical at 3 V and 32 kHz, fully static design supporting DC to 4 MHz operation, an integrated 8-bit analog-to-digital converter (ADC) variant channel-mixing on I/O pins, and a watchdog timer with on-chip RC oscillator for reliable recovery from software lockups. The 13 I/O pins can source/sink up to 25 mA per pin, sufficient to directly drive LEDs, small relays, and logic-level MOSFETS without external buffers. The PIC16C622-04E/P employs CMOS EPROM technology for non-volatile program storage, allowing prototype development with windowed (JW) parts before committing to volume OTP production. The PIC16C6x core family shares a common instruction set, peripheral set, and pinout across PDIP-18, SOIC-18, and SSOP-20 packages, simplifying board-level migration. Built-in peripherals include one 8-bit timer/counter (TMR0), one 16-bit timer/counter (TMR1), a Capture/Compare/PWM (CCP) module, and a synchronous serial port (SSP) supporting SPI and I²C master/slave modes. Typical applications include industrial control logic, automotive body electronics, sensor signal conditioning front-ends, low-power battery instruments, and consumer white goods requiring Extended temperature tolerance. The 4 MHz core delivers ample computational headroom for state-machine-style control firmware while the 15 µA active current keeps standby drain acceptable in solar or energy-harvesting designs. When designing with this device, ensure the ICSP programming header remains accessible for factory OTP programming, since OTP memory cannot be erased in-circuit. Add a 100 nF decoupling capacitor within 5 mm of VDD and a bulk 10 µF tantalum on the supply rail to suppress noise during CCP PWM transitions. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C622-04E/SS - 4MHz 8-bit CMOS EPROM MCU, 20-SSOP | Microchip
PIC16C622-04E/SS

PIC16C622-04E/SS - 4MHz 8-bit CMOS EPROM MCU, 20-SSOP | Microchip

The Microchip Technology PIC16C622-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4 MHz CPU performance in a 20-pin SSOP package with 7.50 mm body width. It integrates 3.5 KB (2K x 14) of EPROM program memory and 128 bytes of SRAM, with 13 general-purpose digital I/O pins and an external oscillator interface. The device operates across a wide voltage range of 3.0 V to 6.0 V, supporting Commercial, Industrial, and Extended temperature grades. An 8-bit CMOS microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and peripheral I/O into one package. The PIC16C family uses a RISC-based Harvard architecture with a 14-bit instruction word, providing deterministic instruction timing of one instruction per clock cycle (except branches). EPROM-based variants such as the PIC16C622 support one-time or windowed reprogrammability, making them well suited for low-volume and prototyping applications where Flash re-programmability is unnecessary. Key features include fully static design (allowing clock stopping), 15 µA typical supply current at 5 V / 4 MHz, and 1 µA typical at 3 V / 32 kHz. The device also supports power-saving SLEEP mode, a watchdog timer, and a programmable code-protection feature on program memory. Its compact 20-pin SSOP footprint is pin-compatible with several siblings in the PIC16C62x family, simplifying board layout reuse across speed grades and temperature ranges. The PIC16C622-04E/SS is widely deployed in legacy industrial controllers, appliance controls, automotive body modules, and instrumentation front-ends that benefit from its mature PIC instruction set and broad third-party toolchain support. The EPROM cell technology and 4 MHz instruction throughput are adequate for control-loop and interface-bridging tasks rather than compute-intensive signal processing. When designing with this part, place a 0.1 µF decoupling capacitor close to the VDD pin and follow Microchip's recommended oscillator layout to minimize EMI. Engineers should also confirm code-protection programming settings before volume production, as the EPROM window cannot be un-protected after sealing. This page synthesizes distributor pricing, drop-in PIC16C6xx alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C622-04I/SO - 4MHz 8-Bit CMOS MCU 3.5KB OTP 18-SOIC | Microchip
PIC16C622-04I/SO

PIC16C622-04I/SO - 4MHz 8-Bit CMOS MCU 3.5KB OTP 18-SOIC | Microchip

The Microchip Technology PIC16C622-04I/SO is an 8-bit EPROM-based CMOS microcontroller in the PIC16C family, delivering 4 MHz CPU performance with 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory and 128 bytes of RAM, housed in an 18-pin SOIC package. It provides 13 digital I/O pins, an external oscillator interface, and operates across the industrial temperature range of -40C to +85C. A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, volatile data memory, and configurable peripheral I/O. The PIC16C architecture places the PIC16C622 in the mid-range PIC taxonomy (PIC10/12/14/16/18), which targets cost-sensitive embedded control applications that require deterministic interrupt response and low power consumption. The '16C' designation indicates EPROM/OTP program memory, distinguishing it from Flash-based 'F' variants (PIC16F) and ROM-based 'C' successors, and from the newer enhanced mid-range '16F1xxx' devices. Key features include 4 MHz maximum clock frequency, 13 I/O lines, an instruction set of 35 single-word instructions, a hardware 8-bit timer/counter, an analog comparator module, and an internal brown-out reset circuit. The device is offered in the industrial temperature grade (designated by the 'I' suffix), making it suitable for factory floor and outdoor equipment. Power consumption is low by design; typical active current is under 2 mA at 4 MHz/5V, and quiescent current drops into the microampere range in SLEEP mode for battery-backed applications. The PIC16C622 uses a RISC CPU core with separate instruction and data buses (Harvard architecture), enabling most instructions to execute in a single instruction cycle. The OTP program memory allows one-time field programming using a device programmer, which historically made this family popular for low-volume production and legacy industrial designs. The 18-SOIC (7.50 mm body width) package is a JEDEC-standard gull-wing surface-mount form factor compatible with hand-soldering and standard SMT assembly. Typical applications include industrial control panels, appliance controllers, security system keypads, smart-card readers, automotive body electronics (non-safety), and battery-powered sensor nodes. The combination of small footprint, deterministic timing, and wide operating voltage range makes it a strong fit for cost-driven embedded designs. When designing with this part, verify whether the target product requires in-system programmability - because the PIC16C622 is OTP, firmware cannot be updated in the field. For new designs requiring flash memory, evaluate PIC16F628 or PIC16F88 as Flash-based drop-in alternatives; otherwise the PIC16C622 remains a stable choice for high-reliability, one-time-burn applications. This page synthesizes distributor stock and pricing data, drop-in alternatives, and practical design notes for the PIC16C622-04I/SO that are not consolidated on any single manufacturer or distributor page.

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PIC16C622-20/P - 8-Bit 20MHz OTP MCU, 3.5KB, 13 I/O | Microchip
PIC16C622-20/P

PIC16C622-20/P - 8-Bit 20MHz OTP MCU, 3.5KB, 13 I/O | Microchip

The Microchip PIC16C622-20/P is an 8-bit CMOS EPROM/ROM-based microcontroller in the PIC16C family, delivering 20MHz operation, 3.5KB (2K x 14) of one-time-programmable (OTP) program memory and 128 bytes of RAM in an 18-pin PDIP through-hole package. It provides 13 general-purpose I/O pins, an internal 8-bit timer/counter, a watchdog timer, and the standard PIC mid-range peripheral set, making it a drop-in member of the well-documented PIC16C6x lineage. What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a Harvard-architecture 8-bit RISC microcontroller from Microchip Technology, organized as: microcontroller -> MCU -> embedded controller -> semiconductor IC. PIC MCUs dominate cost-sensitive embedded designs thanks to deterministic instruction execution, a compact instruction set (35 instructions for mid-range parts like the PIC16C622), and a decades-long ecosystem of compilers, programmers (MPLAB PM3), and in-circuit debuggers. Key features include 20MHz maximum clock (4MHz typical RC operation), 2.7V-6.0V wide operating voltage, 15 µA typical current at 5V/4MHz, and only 1 µA at 3V/32 kHz, fully static design supporting low-power sleep modes, brown-out reset and power-on reset, and commercial/industrial/extended temperature grades. The 20MHz speed grade (the "-20" suffix) targets applications that need faster instruction throughput than the 04 variants. Typical applications include low-cost industrial control, sensor signal conditioning, simple motor drivers, automotive interior modules, and consumer appliance controllers. The 13 I/O and 3.5KB OTP program memory fit legacy designs where deterministic timing and through-hole DIP-18 serviceability are valued over modern surface-mount footprints. When designing with this device, plan a programming path early: OTP requires a device programmer such as the MPLAB PM3, since in-circuit reprogramming is not supported. Add 0.1 µF decoupling on VDD and keep the MCLR pull-up resistor within 10kΩ to ensure reliable reset.

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PIC16C622-20/SS - 8-Bit CMOS EPROM MCU, 3.5KB, 13 I/O | Microchip
PIC16C622-20/SS

PIC16C622-20/SS - 8-Bit CMOS EPROM MCU, 3.5KB, 13 I/O | Microchip

The Microchip Technology PIC16C622-20/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C62X family, delivering 20 MHz maximum clock speed with 3.5 KB of on-chip EPROM program memory and 128 bytes of RAM. Housed in a 20-pin SSOP (Shrink Small Outline Package), it offers 13 general-purpose I/O lines, one 8-bit timer/counter, and a watchdog timer for embedded control. The -20 speed grade denotes 20 MHz operation, and the /SS suffix identifies the SSOP-20 industrial-pinout package variant supplied in tube packaging. A microcontroller is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces into one device. The PIC16C62X belongs to the PIC16 mid-range family, a RISC architecture family within Microchip's 8-bit MCU hierarchy that sits between baseline PIC10/12/14 devices and the enhanced PIC18 family. EPROM (Erasable Programmable Read-Only Memory) is one-time-erasable UV-window program memory, distinguishing this part from flash-based PIC16F equivalents and making it suitable for legacy and development environments where windowed erasure is acceptable. Key features include 35 single-word instructions, 14-bit instruction word, 8-level deep hardware stack, direct/indirect/relative addressing, power-on reset, power-up timer, oscillator start-up timer, and brown-out detection. The device operates from 3.0 V to 6.0 V across commercial 0 °C to +70 °C and industrial -40 °C to +85 °C grades. The PIC16C622 variant adds a single analog comparator and a voltage reference module, distinguishing it from the PIC16C620 (no comparator) and PIC16C621 (comparator only). Typical applications include legacy embedded control systems, industrial sensor interfaces, simple motor control loops, appliance controllers, security and alarm panels, and automotive body electronics where pin-compatible PIC16F replacements are not required. The wide 3.0 V-6.0 V supply range supports both 3.3 V and 5 V rails commonly found in legacy industrial designs. When designing with this device, note that EPROM parts require a quartz-windowed package for erasure and a PROM programmer for code loading. Modern designs typically migrate to the pin-compatible flash-based PIC16F628 or PIC16F88, which share the SSOP-20 footprint but support in-circuit reprogramming. The PIC16C622-20/SS is recommended for legacy maintenance, existing design replication, and applications where the EPROM technology is mandated.

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