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PIC16C56-XTI/P - 8-bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56-XTI/P

PIC16C56-XTI/P - 8-bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-XTI/P is an 8-bit RISC microcontroller belonging to the legacy PIC16C5X family, housed in a 18-pin PDIP through-hole package. It integrates 1.5KB (1K x 12 words) of One-Time-Programmable (OTP) EPROM program memory, 25 bytes of general-purpose RAM, and 12 digital I/O pins, all clocked by a 4MHz internal oscillator. The -XTI suffix designates the 4MHz XT oscillator range with industrial temperature grade (-40C to +85C), and the /P suffix indicates the PDIP-18 package. An 8-bit microcontroller (MCU) is a single-chip computer built around a central processing unit with an 8-bit data path, integrated program memory, working RAM, and configurable I/O peripherals. The PIC16C5X family uses a RISC architecture with only 33 single-word/single-cycle instructions, providing predictable 1:1 instruction-to-clock timing that simplifies deterministic control firmware. As a member of the broader MCU hierarchy, this device sits at the simple-control end of the spectrum: PIC16C5X -> PIC16 family -> 8-bit PIC microcontrollers -> microcontrollers -> embedded computing -> semiconductors. Key features include 12-bit-wide instruction words with 8-bit-wide data path, a two-level deep hardware stack, direct/indirect/relative addressing modes, and a single 8-bit Timer0 (TMR0) with an 8-bit prescaler. The device operates from 3.0V to 5.5V and is fabricated on a low-power CMOS process. Compared to its contemporaries in the same price band, the PIC16C5X family delivers roughly an order of magnitude higher performance per MHz. The architecture uses a separate instruction and data bus (Harvard architecture) which allows instruction fetch and operand access to occur in the same clock cycle. The OTP EPROM enables low-volume prototyping and production without mask charges, making it suitable for mature products where Flash reprogrammability is not required and unit cost dominates. Typical applications include low-cost appliance control, LED driver sequencers, simple sensor front-ends, and legacy industrial timer/controller modules that were designed around the PIC16C5X instruction set. Because the OTP variant is one-time programmable, this part is most often used in mature production runs where firmware is fixed. When designing with this part, plan oscillator loading capacitor values to match the XT crystal specification (typically 15-33 pF) and ensure the MCLR reset circuit uses the correct pull-up topology. Designers migrating to modern Flash-based PICs should note that the PIC16C5X instruction set differs from later mid-range and enhanced mid-range PIC families, so code is not source-compatible.

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PIC16C56/JW - 8-bit 20MHz 1.5KB EPROM MCU | Microchip | CERDIP-18
PIC16C56/JW

PIC16C56/JW - 8-bit 20MHz 1.5KB EPROM MCU | Microchip | CERDIP-18

The Microchip Technology PIC16C56/JW is an 8-bit RISC EPROM-based microcontroller with 20 MHz maximum clock speed and 1.5 KB (1K x 12) of one-time-programmable/UV-erasable program memory, housed in a 18-pin ceramic DIP (CERDIP) windowed package. Key features include 25 bytes of RAM, 12 I/O pins, 8-bit timer/counter (TMR0), two-level hardware stack, 33 single-word/single-cycle instructions, and a wide operating voltage range that supports both 3.3 V and 5 V rails. The JW suffix denotes a windowed CERDIP package, allowing the EPROM to be erased with ultraviolet light and reprogrammed, which makes this part suitable for engineering development and prototyping rather than high-volume production. The PIC16C5X architecture is one of the original PIC microcontroller families, employing a Harvard-style RISC design with separate program and data buses, 12-bit wide instructions, and 8-bit wide data path. The device is fully static, allowing the clock to be stopped without losing internal state. This architecture predates the later PIC16F and PIC18 families but remains popular in legacy industrial controls, automotive subsystems, and education markets where long lifecycle support and known behavior are valued. Typical applications include simple logic replacement, motor and relay control, sensor signal conditioning, LED and seven-segment display driving, and battery-powered instruments. The low part count (no external program memory or data memory required) and inexpensive ceramic package make the PIC16C56/JW a fit for prototypes and small retrofit projects. When designing with this part, note that the windowed CERDIP package is significantly more expensive than the equivalent OTP plastic DIP variant (PIC16C56-04/P or PIC16C56-20/P). Reserve the JW version for development cycles where code revision is anticipated. Per the Microchip datasheet, all unused I/O pins should be configured as outputs to minimize current consumption. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical development notes not found in the manufacturer datasheet.

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PIC16C56A-04/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56A-04/P

PIC16C56A-04/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56A-04/P is an 8-bit CMOS RISC microcontroller from the PIC16C5X family operating at 4 MHz, integrating 1.5 KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 bytes of data RAM, and 12 general-purpose I/O lines in an 18-pin PDIP through-hole package. The "04" speed suffix designates a 4 MHz oscillator input, while the "A" suffix marks the second-generation silicon revision that lowered power consumption and added enhancements over the original PIC16C56. The OTP program memory is programmed once with a device programmer such as the MPLAB PM3 and cannot be erased, making this part a fit for mature, low-cost, high-volume production. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one die. The PIC16C5X family belongs to the PIC (Peripheral Interface Controller) lineage and sits within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The "RISC" architecture of the PIC16C5X uses only 33 single-word, single-cycle instructions, simplifying code generation and enabling deterministic instruction timing — a hallmark of PIC mid-range and baseline cores. Key differentiating specifications include: 33 single-word/single-cycle RISC instruction set, two-level deep hardware stack for subroutine nesting, one 8-bit real-time counter/timer (TMR0), Power-on Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator for reliable system recovery, and a wide 2.5 V to 6.25 V supply voltage range that allows battery and 5 V-rail designs. The OTP memory, four oscillator selections (RC, XT, HS, LP), and direct/indirect/relative addressing modes give designers flexibility in cost-optimized control loops. Typical applications span automotive body controllers, appliance controls, security keypads, simple sensor interfaces, low-end consumer products, and replacement of discrete logic with programmable intelligence. Because the PIC16C56A-04/P is offered in commercial and automotive grades, it is also used in under-hood and dashboard subsystems where OTP and known-good silicon are preferred over flash. A critical design consideration is that OTP parts cannot be reprogrammed in-circuit: firmware must be fully validated before programming. Engineers should plan for a programmer socket or a parallel-programmable strategy using the MPLAB PM3, and reserve the WDT for fail-safe recovery from code lockups. This page synthesizes verified distributor pricing, same-family and cross-brand drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet excerpt, helping procurement and embedded engineers evaluate the PIC16C56A-04/P against modern 8-bit replacements.

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PIC16C56A-04/SO - 4MHz 8-bit OTP MCU 1.5KB SOIC-18 | Microchip
PIC16C56A-04/SO

PIC16C56A-04/SO - 4MHz 8-bit OTP MCU 1.5KB SOIC-18 | Microchip

The Microchip Technology PIC16C56A-04/SO is an 8-bit CMOS ROM-based microcontroller from the PIC16C5x family, delivering up to 4 MHz operating frequency with 1.5 KB of One-Time-Programmable (OTP) program memory and 25 bytes of RAM, packaged in an 18-pin SOIC (SO) wide-body SMD package. It exposes 12 digital I/O lines and integrates a 12-bit instruction set that achieves 2:1 code compression over competing 8-bit MCUs in the same price class. The device is fabricated in CMOS technology and is intended for low-cost, high-volume embedded control where deterministic behavior and small code footprint matter more than peripherals. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and programmable I/O. The PIC16C5x architecture belongs to the original baseline PIC family, sitting in the hierarchy MCU -> 8-bit microcontroller -> embedded controller -> semiconductor. Baseline PIC cores use a Harvard architecture with separate program and data paths, RISC-like instruction set, and a hardware call/return stack. The 'A' revision in PIC16C56A adds lower power consumption and improved oscillator stability versus the original PIC16C56, while keeping the same 18-pin pinout and instruction set for source compatibility. Key features of the PIC16C56A-04/SO include: 1.5 KB OTP program memory (1K x 12), 25 bytes of RAM, 12 I/O pins, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and an internal/external oscillator option. The 04 speed grade specifies 4 MHz maximum clock. The wide SOIC-18 package supports surface-mount assembly on consumer and industrial PCBs. Technical depth: the PIC16C56A uses a 12-bit instruction word and a two-stage pipeline. With a 4 MHz oscillator the instruction cycle is 1 microsecond (4 Tosc). All 12 I/O pins can source/sink typical CMOS levels and individually trigger wake-up from SLEEP on pin change. The on-chip watchdog runs from a dedicated internal RC oscillator independent of the system clock, so it remains active even in SLEEP mode for failsafe recovery. Typical applications include consumer appliance control, small white-goods motor/relay drivers, low-end remote-control transmitters, LED display drivers, simple sensor signal conditioning, and replacement of discrete logic in cost-sensitive embedded products. Designers choose this part when OTP (one-time-programmable) cost is acceptable and the firmware is locked at production. When designing with this device, budget OTP programming time and tooling into the production flow; PIC16C5x OTP parts are programmed by Microchip-approved gang programmers. Ensure the oscillator selection matches the operating environment (XT, HS, LP, RC modes), and respect the 5.5 V absolute-maximum VDD rating. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes - including a same-package cross-reference matrix and recommended companion parts - not assembled on the manufacturer datasheet or single distributor pages.

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PIC16C56A-04E/P - 1.5KB OTP 8-bit MCU, 4MHz, Ext Temp | Microchip
PIC16C56A-04E/P

PIC16C56A-04E/P - 1.5KB OTP 8-bit MCU, 4MHz, Ext Temp | Microchip

The Microchip Technology PIC16C56A-04E/P is an 8-bit CMOS RISC microcontroller in the PIC16C5X family, offered in a 18-pin PDIP through-hole package. It integrates 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, 12 digital I/O lines and a 4MHz internal/external oscillator. The "04E" suffix designates the 4MHz speed grade and the extended (-40C to +125C) automotive temperature range, while "/P" identifies the PDIP-18 package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM and peripheral I/O. The PIC16C5X series belongs to the original baseline PIC architecture using 12-bit wide instructions and a RISC instruction set of only 33 single-word, single-cycle opcodes. Within the broader taxonomy, this part is a 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. Its baseline RISC architecture makes it well suited to deterministic, low-cost control loops rather than to high-throughput digital signal processing. Key features of the PIC16C56A-04E/P include 1.5KB OTP program memory (one-time field-programmable, ideal for mature/production code), 25 bytes of RAM, a 4MHz maximum operating frequency giving 1us instruction cycle, 12 bidirectional I/O pins, an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, watchdog timer with on-chip RC oscillator, Power-on Reset, and brown-out detection. The device is built on a fully static CMOS process, allowing clock frequencies down to DC. Power-saving SLEEP mode and a wide 2.5V-5.5V operating range simplify battery and industrial 5V designs. Typical applications include automotive body controllers, HVAC damper control, appliance front panels, simple sensor interfaces, white-goods motor control, security alarm keypads, and low-cost replacement of 555-timer-based discrete logic. The extended temperature grade (-40C to +125C) allows under-hood deployment. When designing with this device, remember that OTP parts cannot be reprogrammed in-circuit; an EPROM windowed version (PIC16C56A-04/JW) is required for prototype development. For higher-volume or flash-based designs consider the pin-compatible PIC16F54 family.

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PIC16C56A-04E/SS - 1KB OTP 8-bit MCU, 4MHz, SSOP-20 | Microchip
PIC16C56A-04E/SS

PIC16C56A-04E/SS - 1KB OTP 8-bit MCU, 4MHz, SSOP-20 | Microchip

The Microchip PIC16C56A-04E/SS is a 1.5KB (1K x 12) one-time-programmable (OTP) 8-bit RISC microcontroller in the PIC16C5X family, housed in a 20-pin SSOP (Shrink Small Outline) package rated for the -40C to +125C extended automotive temperature grade. It runs at up to 4MHz clock speed from a 3V to 5.5V supply, delivers 12 I/O lines, and integrates a Power-On Reset (POR), Watchdog Timer (WDT), and a programmable timer/counter on-chip. An OTP EPROM-based microcontroller is a one-time-programmable 8-bit MCU whose program memory is implemented in EPROM cells; once blown, the code cannot be electrically erased, which is why OTP parts are designed for low-to-medium volume production where mask-ROM NRE costs are not justified. Within the broader silicon taxonomy, OTP MCUs sit under the family of EPROM/ROM-based microcontrollers, which themselves fall under 8-bit microcontrollers, then microcontrollers (MCU), and finally the integrated circuits (IC) category. The PIC16C5X family is Microchip's baseline low-cost, high-performance RISC architecture family, delivering 33 single-word, single-cycle instructions (branches take two cycles) and 2:1 code compression versus other 8-bit MCUs in its class. The 04 speed grade denotes a 4MHz oscillator maximum, and the E suffix designates the extended -40C to +125C operating temperature range suitable for industrial and automotive under-hood applications. The SS package indicates a 20-pin Shrink Small Outline (SSOP, 0.209 inch / 5.30mm body width) gull-wing surface-mount outline. With twelve I/O lines and the low pin count, this device targets cost-sensitive embedded control such as appliance controllers, sensor interfaces, LED drivers, and automotive body controllers where extended-temperature reliability is required. Architecturally, the PIC16C56A uses a Harvard-style separated program/data bus with a 12-bit program word and an 8-bit data path. The OTP memory of 1024 12-bit words gives roughly 1.5KB of code space, and the integrated peripherals - POR, WDT, and one 8-bit timer - are sufficient for simple state-machine and timing control loops. Because the part is OTP rather than Flash, it cannot be reprogrammed in-circuit; production programming requires a device programmer such as the MPLAB PM3 universal device programmer. Typical applications include automotive body and chassis sub-assemblies (such as mirror controllers, seat switches, and simple sensor conditioning nodes), industrial appliance control (washing-machine sub-controllers, HVAC damper drivers), and cost-sensitive consumer electronics (remote controls, LED signage controllers, and small toys). The wide 3V to 5.5V range also allows direct operation from a regulated 5V rail or two alkaline cells. When designing with this part, remember that OTP is one-time programmable - firmware bugs cannot be fixed after programming without re-rolling a new silicon lot, so pre-production verification on the pin-compatible PIC16F56 Flash version is recommended. Decoupling must include a 100nF ceramic capacitor between VDD and VSS placed within 5mm of the package, and unused I/O pins should be configured as outputs to minimize current consumption. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet - giving engineers a faster, side-by-side comparison for the PIC16C56A-04E/SS and its closest SSOP-20 substitutes in the PIC16C5X family and competitor portfolios.

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PIC16C56A-04I/P - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip
PIC16C56A-04I/P

PIC16C56A-04I/P - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip

The Microchip Technology PIC16C56A-04I/P is an 8-bit, fully static, EPROM/OTP-based CMOS microcontroller from the PIC16C5X family, operating at up to 4 MHz with 1.5 KB (1K x 12) of program memory and 25 bytes of RAM, housed in an 18-pin PDIP (P) through-hole package. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripherals. The PIC16C5X family implements a RISC architecture with only 33 single-word/single-cycle instructions, delivering 2:1 code compression versus other 8-bit MCUs in its class, and belongs to the broader hierarchy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. The 'C' in PIC16C56A designates the EPROM/OTP program-memory variant, while the '04' suffix denotes a 4 MHz maximum clock and the 'I' suffix indicates the industrial temperature range (-40C to +85C). Key features of the PIC16C56A-04I/P include 12 I/O pins, an 8-bit real-time clock/counter (TMR0) with a programmable prescaler, a two-level deep hardware stack, direct/indirect/relative addressing modes, a watchdog timer, and a power-on reset circuit. The device supports 2.5V to 6.25V operating voltage (industrial), is fully static for low-power operation, and offers seven or eight special-function hardware registers. The PIC16C56A uses a 12-bit instruction word with an 8-bit data path, executed in a single instruction cycle (4 clock cycles). The RISC design reduces instruction count, which in turn reduces code size and improves deterministic execution - ideal for tight embedded loops and interrupt-driven designs. With 1K instructions of OTP program memory, parts are programmed once and cannot be electrically erased; this suits mature, fixed-function designs. Typical applications include appliance control, security panels, simple sensor interfaces, hobby projects, educational platforms, and industrial timer/counter modules. The 18-pin PDIP package is breadboard-friendly, making it a long-standing favorite for learning and prototyping. When designing with the PIC16C56A-04I/P, consider that OTP memory cannot be reprogrammed - this part suits production-ready firmware only, not iterative development. For development, use the PIC16F56 (Flash) or PIC16C56A JW (windowed) variants in the same family.

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PIC16C56A-04I/SO - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56A-04I/SO

PIC16C56A-04I/SO - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56A-04I/SO is an 8-bit CMOS RISC microcontroller from the PIC16C5X family, operating at up to 4 MHz with 1.5 KB of one-time-programmable (OTP) program memory organized as 1K x 12 words, packaged in an 18-pin SOIC (300-mil, SO) outline and qualified for the industrial -40C to +85C temperature range. What is an OTP microcontroller? An OTP microcontroller is a single-chip microcomputer that contains non-erasable program memory (typically EPROM-based) which can be programmed once after manufacture and never re-written. These parts occupy a position in the taxonomy: microcontroller -> embedded MCU -> 8-bit MCU -> OTP MCU -> RISC MCU. OTP devices are common in low-cost, high-volume consumer and industrial applications where firmware is fixed for the product lifetime and field re-programmability is not required. Key features of the PIC16C56A-04I/SO include 25 bytes of general-purpose RAM, 12 digital I/O pins, an 8-bit real-time clock/counter (TMR0) with 8-bit programmable prescaler, a two-level deep hardware stack, and 33 single-word single-cycle RISC instructions. The Harvard architecture separates the 12-bit program path from the 8-bit data path, achieving a 2:1 code compression over competing 8-bit architectures and most instructions execute in one instruction cycle (250 ns at 4 MHz oscillator). The device integrates an internal power-on reset, watchdog timer, and code-protection bit for basic security. Power-saving SLEEP mode reduces Icc to less than 1 uA typical, making the part suitable for battery or line-powered applications with strict standby budgets. Operating voltage is 2.5V to 6.0V (commercial/industrial), and I/O sink/source capability is rated for direct LED drive in many designs. Typical applications include low-cost remote controls, small appliance controls, LED drivers, simple sensor interfaces, and battery-powered toys where low unit cost and small footprint outweigh the need for flash reprogrammability. The PIC16C5X RISC instruction set and Microchip's free MPLAB development toolchain (with PM3 programmer) make this family a long-standing choice for cost-sensitive embedded products. When designing with this part, evaluate whether your firmware will require field updates; if so, choose a flash-based PIC16F equivalent instead. The OTP variant offers the lowest unit cost but cannot be re-programmed. Use the Microchip PM3 or equivalent programmer; do not attempt in-system programming since the device lacks ICSP. This page synthesizes distributor pricing, drop-in same-package alternatives (PIC16C55A-04I/SO, PIC16C54A-04I/SO), datasheet pinout and design notes not found on a single distributor listing.

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PIC16C56A-20/SS - 8-Bit 20MHz OTP MCU 1.5KB | Microchip
PIC16C56A-20/SS

PIC16C56A-20/SS - 8-Bit 20MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56A-20/SS is a ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, delivering 20 MHz maximum clock speed with 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory and 25 bytes of RAM in a 20-pin SSOP package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, working RAM, and I/O peripherals on one die. PIC16C5X microcontrollers belong to the original baseline PIC architecture with 12-bit-wide instructions, 8-bit-wide data paths, and a two-level deep hardware stack; they sit at the base of Microchip's PIC hierarchy (PIC16C5X -> baseline PIC -> PICmicro -> 8-bit MCU -> microcontroller -> semiconductor IC) and offer 2:1 code compression versus competing 8-bit devices in their class. The 16C56A variant uses OTP EPROM rather than mask ROM or flash, which simplifies low-volume programming while maintaining a non-volatile program image. Key features include 12 I/O pins, an 8-bit real-time clock/counter (TMR0), direct/indirect/relative addressing modes for both data and instructions, seven or eight special-function hardware registers, and a wide operating voltage range of 3.0 V to 5.5 V. The PIC16C56A-20/SS variant is rated for 20 MHz operation across the industrial 0C to +70C range. The SSOP-20 (5.30 mm body) package keeps the footprint compact while supporting surface-mount reflow assembly. Typical applications include low-cost consumer appliances, simple sensor interfaces, motor-control front-ends, LED drivers, and white-goods control boards where deterministic baseline-PIC code density is favored over modern peripherals. The OTP memory, two-level stack, and minimal RAM footprint make this part best suited for fixed-function, ROM-replacement designs rather than application-rich platforms. When designing with this part, plan code size carefully: 1K x 12 of program memory is only enough for modest state-machine logic, and the two-level hardware stack restricts nested subroutine depth. The PIC16C56A-20/SS does not include an in-system debugger or EEPROM, so consider the newer PIC16F series if your firmware must evolve in the field. This page synthesizes distributor pricing, drop-in PIC16C5X alternatives, and practical design notes not found on a single manufacturer page, helping engineers and buyers evaluate the part side-by-side with modernized flash-based PIC16F equivalents.

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PIC16C56A-20E/P - 8-bit OTP MCU, 20MHz, DIP-18 | Microchip
PIC16C56A-20E/P

PIC16C56A-20E/P - 8-bit OTP MCU, 20MHz, DIP-18 | Microchip

The Microchip PIC16C56A-20E/P is an 8-bit RISC microcontroller from the PIC16C5X family, housed in an 18-pin PDIP (DIP-18) through-hole package and rated for 20 MHz maximum operating frequency. It integrates 1 K x 12-bit EPROM program memory, 25 bytes of RAM, and 12 dedicated I/O pins, delivering compact deterministic control for cost-sensitive embedded applications. The 'E' temperature grade extends operation to -40C to +125C, supporting automotive and industrial environments. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that combines a CPU, program memory, data RAM, and peripherals on a single die. Within the broader hierarchy, the PIC16C56A sits inside: MCU -> 8-bit MCU -> RISC microcontroller -> PIC16 family -> PIC16C5X baseline OTP sub-family -> general-purpose embedded controller. Baseline PIC16C5X devices use a 12-bit-wide instruction set with Harvard architecture, optimized for 2:1 code compression versus competing 8-bit MCUs in its price class. Key features include 20 MHz clock input with 200 ns instruction cycle, single 5V supply operation (2.5V to 6.0V extended), 12 I/O pins with high-current sink/source capability, and a watchdog timer with on-chip RC oscillator for reliable unattended operation. The architecture provides a hardware interrupt-free polling model with eight-bit-wide data paths and a 2-level deep hardware stack, simplifying firmware design for routine control tasks. Technical depth: the PIC16C56A uses an OTP (One-Time-Programmable) EPROM program memory that is programmed once and cannot be electrically erased, distinguishing it from flash-based PIC16F variants. The device supports in-circuit serial programming via Microchip's ICSP protocol only on specific package variants; the 'JW' windowed package enables UV erasure for development. Power consumption is typically <2 mA at 5V/4 MHz, with sleep current under 1 uA when the watchdog timer is disabled, making it suitable for battery-augmented applications. Typical applications include automotive relay logic replacement, appliance control boards, security sensor interfaces, low-end consumer toys, and simple industrial timer/counter modules where cost, deterministic response, and a through-hole footprint outweigh the need for flash memory or onboard peripherals. When designing with this part, note that the OTP memory requires pre-programmed parts for production - factor lead time and programming service into your NPI schedule. The 12-bit instruction set differs from later 14-bit (PIC16F) cores, so legacy assembly code must be reviewed. This page synthesizes distributor pricing, same-family drop-in alternatives (including tape/reel variants and PIC16C54A family siblings), and practical design notes not aggregated in the manufacturer datasheet, helping engineers evaluate the PIC16C56A-20E/P against both newer flash-based MCUs and legacy OTP drop-ins on the same DIP-18 footprint.

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PIC16C56A-20E/SO - 8-bit OTP MCU, 1.5KB, 20MHz, SOIC-18 | Microchip
PIC16C56A-20E/SO

PIC16C56A-20E/SO - 8-bit OTP MCU, 1.5KB, 20MHz, SOIC-18 | Microchip

The Microchip PIC16C56A-20E/SO is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, offered in a 18-pin SOIC (SO) package with 20 MHz maximum clock speed and an extended operating temperature range. An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and peripherals such as I/O ports and timers. PIC16C5X devices are OTP (One-Time-Programmable) EPROM-based MCUs designed for cost-sensitive embedded applications. Within the broader semiconductor taxonomy, the PIC16C56A belongs to the hierarchy MCU -> microcontroller -> embedded processor -> semiconductor IC, and uses the classic PIC RISC architecture with 12-bit-wide instructions for approximately 2:1 code density versus typical 8-bit CISC cores. Key specifications include 1.5 KB of OTP program memory (1K x 12), 25 bytes of RAM, 12 digital I/O pins, two 8-bit timers, an instruction cycle time of 200 ns at 20 MHz, and a wide 3.0 V to 5.5 V operating voltage range. The 'E' suffix designates the extended industrial temperature grade (-40C to +125C). The SOIC-18 surface-mount package simplifies board assembly and reflow soldering versus the original PDIP variants. Architecturally, the PIC16C56A uses a Harvard-style RISC core with a 2-stage pipeline, 33 single-word/single-cycle instructions, and a hardware stack. It features a watchdog timer, power-on reset, brown-out detection (variant-dependent), and a low-power SLEEP mode. The 12-bit instruction word and 8-bit data path produce compact code density while sustaining deterministic interrupt latency for real-time control. Typical applications include appliance control, simple sensor interfaces, LED driving logic, low-cost consumer electronics, hobbyist projects, and industrial logic replacement where small, deterministic, OTP-programmed MCUs are appropriate. The SOIC-18 package also supports high-volume SMT production lines. When designing with this device, note that OTP memory cannot be re-programmed in-circuit - select a Flash-based PIC16F equivalent (e.g., PIC16F54) for development cycles that require firmware revision. Decoupling VDD/VSS with a 100 nF ceramic capacitor adjacent to the IC is essential; place MCLR pull-ups and oscillator components to minimize noise-induced resets. This page consolidates distributor pricing across LCSC, Mouser and Hotenda, real-time cross-reference alternatives from Microchip's same-family PIC16C5X lineup, and practical design considerations beyond what is summarized in the manufacturer datasheet.

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PIC16C56A-20E/SS - 8-bit OTP MCU, 1.5KB, 20MHz | Microchip
PIC16C56A-20E/SS

PIC16C56A-20E/SS - 8-bit OTP MCU, 1.5KB, 20MHz | Microchip

The Microchip Technology PIC16C56A-20E/SS is a ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, featuring 1.5KB (1K x 12) of one-time programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins, all housed in a 20-pin SSOP package. It executes instructions at up to 20 MHz from a 5V supply and operates across the extended industrial temperature range of -40C to +125C, making it suitable for harsh-environment embedded control. What is an 8-bit OTP microcontroller? An OTP (One-Time Programmable) MCU is a class of microcontroller whose program memory can be written exactly once after manufacture, using a device programmer, and then behaves like a mask-ROM part for the rest of its life. The PIC16C5X series falls under the broader hierarchy: microcontroller -> embedded controller -> semiconductor. It uses a RISC-style 12-bit instruction word with only 33 single-cycle instructions, which gives roughly 2:1 code compression versus typical 8-bit CISC competitors and allows a 20 MHz oscillator to deliver up to 5 MIPS of throughput. Key features include 12 bidirectional I/O pins with individual direction control, a watchdog timer for fault recovery, a power-on reset circuit, and an internal 4 MHz RC oscillator option for low-cost designs. The 20 MHz external clock version (-20) delivers 5 MIPS peak throughput. Power consumption is dominated by CMOS static design with sleep-mode current on the order of microamps, enabling battery-friendly standby behavior. The SSOP-20 footprint occupies only 5.30 mm of board width. Typical applications include low-cost appliance controllers, sensor front-ends, white-goods human-machine interfaces, automotive body modules, smart metering, and industrial timer/counter boards. The combination of OTP memory, 12-bit instruction set, and extended temperature range has made the PIC16C56A a long-lifecycle workhorse for products that ship in high volume and rarely change firmware. When designing with this device, ensure that oscillator start-up time is budgeted in the reset vector and that the configuration word is set correctly for the chosen oscillator mode (XT, HS, LP, or RC). Because OTP cannot be erased, firmware validation should be performed on a windowed (JW) or flash equivalent (PIC16F56 family) before committing code to production parts. This page synthesizes distributor pricing, drop-in pin-compatible alternatives within the PIC16C5X family, and practical design notes not found in the manufacturer datasheet.

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PIC16C56A-20I/P - 8-bit OTP MCU 1.5KB 20MHz PDIP-18 | Microchip
PIC16C56A-20I/P

PIC16C56A-20I/P - 8-bit OTP MCU 1.5KB 20MHz PDIP-18 | Microchip

The Microchip Technology PIC16C56A-20I/P is an 8-bit CMOS ROM-based microcontroller in a PDIP-18 through-hole package with 1.5 KB of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and a 20 MHz maximum operating frequency. Built on Microchip's baseline PIC16C5x architecture, it integrates 12 bidirectional digital I/O pins, an 8-bit timer/counter (TMR0), and a 2-level hardware stack, making it suitable for simple, low-cost embedded control applications. A microcontroller (MCU) is a single-chip computer that contains a processor core, program memory, working RAM, and peripheral interfaces. Within the broader semiconductor hierarchy, MCUs belong to the digital IC family, which in turn falls under integrated circuits for embedded systems. The PIC16C5x baseline series specifically uses 12-bit-wide instructions and an 8-bit data path, providing roughly 2:1 code compression versus competing 8-bit architectures in the same price class, a key reason this family remains in long-life industrial designs. Key features of the PIC16C56A-20I/P include 1.5 KB (1K x 12) of OTP program memory, 25 bytes of data RAM, a 2-level deep hardware stack, and direct/indirect/relative addressing modes for both data and instructions. The device operates over the industrial temperature range (-40C to +85C, indicated by the 'I' suffix) and supports up to 12 I/O pins plus 1 input-only pin. It includes a watchdog timer, power-on reset, and an 8-bit real-time clock/counter (TMR0) with programmable prescaler. Programming is performed via Microchip's ICSP interface using tools such as the MPLAB PM3 universal device programmer. Typical applications include appliance control, sensor interfaces, low-cost remote controls, LED drivers, hobby projects, and industrial automation subsystems where simple deterministic control is preferred over a higher-end MCU. The 20 MHz oscillator delivers up to 5 MIPS of throughput, sufficient for state-machine, PWM, and serial bit-banged protocols. When designing with the PIC16C56A, engineers should use MPLAB X IDE and the MPASM/XC8 toolchain, observe Vdd decoupling guidelines (100 nF + 10 uF near the supply pins), and confirm that OTP programming budget is sufficient before committing to the part. The PDIP-18 footprint simplifies breadboard and through-hole prototyping.

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PIC16C56A-20I/SS - 8-Bit OTP MCU, 1.5KB, 20MHz | Microchip
PIC16C56A-20I/SS

PIC16C56A-20I/SS - 8-Bit OTP MCU, 1.5KB, 20MHz | Microchip

The Microchip Technology PIC16C56A-20I/SS is a ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, offering 1.5KB of one-time programmable (OTP) program memory, 25 bytes of RAM, and a 12-bit instruction word width with an 8-bit data path in a 20-pin SSOP package. It executes up to 20 million instructions per second when clocked at 20 MHz, making it suitable for cost-sensitive embedded control loops where deterministic RISC execution is required. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile data memory, and peripheral interfaces. The PIC16C5X family is one of the earliest Microchip PIC architectures - a fully static, EPROM/ROM-based CMOS RISC core featuring a two-level hardware stack, direct/indirect/relative addressing, and seven or eight special-function hardware registers. As an OTP device, the PIC16C56A is factory-programmed or user-programmed once and cannot be erased, which positions it between mask-ROM (PIC16C56) and windowed-EPROM (PIC16C56/JW) variants for low-volume production. Key differentiating features include the 8-bit Timer0 with a programmable prescaler, 12 I/O pins, a wide 2.5V-6.25V operating range, and an industrial temperature grade of -40C to +85C. The 20 MHz oscillator mode is denoted by the -20 speed suffix, while the /SS suffix confirms the 5.30 mm body 20-pin SSOP surface-mount package with gull-wing leads, ideal for compact PCB designs where DIP footprint is too large. Architecturally, the device uses a Harvard-style memory map with separate program and data buses, executes single-cycle instructions except for program branches, and provides a hardware stack two levels deep - sufficient for simple subroutine nesting. The PIC16C5X is fully static, allowing the clock to be stopped for low-power sleep states. Typical applications include appliance control, LED driver sequencers, simple sensor interface boards, low-cost consumer toys, and replacement of discrete logic in legacy designs. Its small SSOP footprint makes it attractive for space-constrained handheld products and disposable medical devices where per-unit cost dominates BOM decisions. When designing, ensure the oscillator configuration matches the application: RC mode for lowest cost, XT for standard 4 MHz crystals, HS for 20 MHz operation. OTP parts require one-time programming via Microchip's PRO MATE II or compatible device programmer; consider the flash-based PIC16F54 drop-in if in-field firmware updates are needed later. This page synthesizes distributor stock and pricing, drop-in alternative MPNs with parametric match scores, and practical design notes not consolidated on the manufacturer product page.

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PIC16C56A-40/P - 8-bit OTP MCU, 1.5KB, 40MHz, PDIP-18 | Microchip
PIC16C56A-40/P

PIC16C56A-40/P - 8-bit OTP MCU, 1.5KB, 40MHz, PDIP-18 | Microchip

The Microchip Technology PIC16C56A-40/P is a low-cost, high-performance 8-bit CMOS microcontroller based on the PIC16C5X family, featuring 1.5KB (1K x 12) of one-time-programmable (OTP) EPROM program memory, 25 bytes of data RAM, and 12 digital I/O pins. Housed in an 18-pin Plastic Dual In-line Package (PDIP-18), the device operates at a maximum clock frequency of 40 MHz from a 4.0V to 6.0V supply, delivering up to 5 MIPS of instruction throughput via its RISC architecture with only 33 single-word/single-cycle instructions. The '-40' suffix denotes the 40 MHz maximum operating frequency, while '/P' identifies the through-hole PDIP package rated for commercial 0C to +70C operation. A microcontroller (MCU) is an integrated circuit that combines a CPU, memory (program and data), and peripherals on a single die, designed to execute embedded control tasks. The PIC16C5X family specifically uses a Harvard RISC architecture with separate program and data buses, a 12-bit instruction word, and a 2:1 code compression advantage over competing 8-bit CISC microcontrollers, making it well-suited for cost-sensitive, high-volume applications. The 'OTP' (One-Time-Programmable) designation means each device can be programmed once with user firmware using an MPLAB PM3 or compatible device programmer, and the bit pattern is then permanent. Key features of the PIC16C56A-40/P include its 8-bit timer/counter (TMR0) with an 8-bit prescaler, a watchdog timer with on-chip RC oscillator for reliable operation, Power-on Reset (POR), and a fully static design that allows the clock to be stopped without losing register contents. The device supports in-circuit serial programming via Microchip's ICSP protocol and provides 12 bidirectional I/O pins capable of sinking up to 25 mA per pin for direct LED drive. Typical applications include consumer appliance control, low-end remote controls, automotive body electronics (non-safety), simple sensor interfaces, battery chargers, and white goods timers. Its commercial temperature range (0C to +70C) and 40 MHz performance make it well-suited for cost-driven consumer products where reprogramming is not required in production and BOM cost dominates the design priority. Engineers should note that the OTP memory prevents field firmware updates, so this part is generally used in closed, single-configuration products. This page synthesizes distributor pricing, parametric comparisons, and design notes for the PIC16C56A-40/P, complementing the Microchip datasheet with drop-in alternatives and AEO-optimized answers for sourcing decisions.

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PIC16C56A/JW - 8-Bit 20MHz 1.5KB EPROM MCU | Microchip
PIC16C56A/JW

PIC16C56A/JW - 8-Bit 20MHz 1.5KB EPROM MCU | Microchip

The Microchip Technology PIC16C56A/JW is an 8-bit RISC CMOS microcontroller in the PIC16C5x family, integrating 1.5 KB (1K x 12) of One-Time-Programmable UV-erasable EPROM program memory and 25 bytes of data RAM. The JW suffix indicates the 18-pin CERDIP windowed package, which exposes the die for UV erasure and reprogramming during development and prototyping. According to the Microchip product listing on DigiKey, the part runs at up to 20 MHz across a 2.5 V to 6.25 V operating range and ships as 8-bit data-path / 12-bit instruction-width RISC core. A PIC microcontroller (Programmable Intelligent Computer, also known as Peripheral Interface Controller) is a Harvard-architecture RISC MCU family in which program and data memories occupy separate address spaces. The PIC16C5x sub-family is the legacy "baseline" tier of PIC microcontrollers, positioned below the PIC16C7x/8x mid-range family and well below the PIC18 enhanced family in the modern Microchip taxonomy. The 'C' suffix denotes CMOS EPROM technology (later replaced by flash-based PIC16F parts), and the JW package is reserved almost exclusively for engineering development because of its quartz window and high cost. Key features of the PIC16C56A include seven or eight special-function hardware registers, a two-level deep hardware call stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with a programmable prescaler, 12 programmable digital I/O lines, a Power-on Reset (POR) block, and a Watchdog Timer (WDT) for unattended operation. The Harvard architecture separates the 12-bit program bus from the 8-bit data bus, allowing instruction fetch and operand access to occur in the same cycle. Typical applications include low-cost 8-bit embedded control in industrial timers and counters, appliance controllers, simple sensor front-ends, LED and relay driver boards, and educational/hobbyist platforms where the UV-erasable window allows repeated firmware iteration. The JW windowed CERDIP package is rarely used in production builds because the OTPEPROM can be erased and reprogrammed in-circuit by exposing the die to UV light through the quartz window. Designers should note that the PIC16C56A is widely regarded as mature/legacy silicon. For new designs, Microchip recommends the flash-based PIC16F54 in a modern SOIC or QFN package. The CERDIP JW variant is best reserved for development, lab work, and legacy board repair. Pricing varies significantly with availability because of limited production runs.

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PIC16C56AT-04/SO - 4MHz 8-bit OTP MCU 1.5KB | Microchip SOIC-18
PIC16C56AT-04/SO

PIC16C56AT-04/SO - 4MHz 8-bit OTP MCU 1.5KB | Microchip SOIC-18

The Microchip Technology PIC16C56AT-04/SO is an 8-bit EPROM/ROM-based CMOS microcontroller belonging to the PIC16C5X family, delivering 4 MHz CPU performance with 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory and 25 bytes of RAM in a 18-pin SOIC (Small Outline) package. Housed in an industry-standard 18-SOIC (0.295 inch / 7.50 mm body width) surface-mount package with gull-wing leads, this commercial-temperature grade device provides 12 I/O pins and operates from a single 5 V supply. The 'T' suffix denotes tape and reel packaging, while the 'A' suffix indicates an enhanced silicon revision (PIC16C56A) of the baseline PIC16C56, and '04' specifies the 4 MHz maximum clock rate. An 8-bit microcontroller (MCU) is a self-contained computing element that integrates a CPU core, non-volatile program memory, working RAM, and programmable I/O peripherals on a single CMOS die. The PIC16C5X family represents one of the earliest reduced-instruction-set computing (RISC) architectures adopted in mainstream microcontrollers, employing a 12-bit-wide instruction word that yields roughly 2:1 code compression versus competing 8-bit CISC architectures in the same era. Within the broader taxonomy, this device sits at the hierarchy: 8-bit MCU -> RISC microcontroller -> microcontroller -> embedded processor -> semiconductor IC. Key differentiating specifications of the PIC16C56AT-04/SO include its 33 single-word (12-bit) instructions, fully static CMOS design that allows clock rates down to DC, dedicated watchdog timer with on-chip RC oscillator, power-saving SLEEP mode, and wide operating voltage range. The 12-bit instruction width and Harvard bus architecture deliver deterministic throughput of one instruction per two clock cycles, enabling predictable interrupt response suitable for cost-sensitive real-time control loops. Typical applications include low-cost appliance control, automotive interior lighting (non-safety), simple sensor interfaces, hobby robotics, and replacement of discrete logic in legacy designs. The OTP program memory is ideal for short production runs or prototype deployments where mask-ROM volume economics are not justified. The 4 MHz CPU clock combined with 1K instruction words provides sufficient headroom for state-machine-style controllers in industrial and consumer products. When designing with this part, designers should note the absence of in-circuit serial programming (ICSP) on early PIC16C5X silicon - code is loaded via a parallel programmer socket prior to solder mounting, or via windowed ceramic packages. The '04' speed grade must not be exceeded; 20 MHz variants use the '-20' suffix. For new designs, the flash-based PIC16F57 family offers modern in-circuit programmability at the cost of changed non-volatile memory technology. This page consolidates distributor pricing, drop-in alternatives, parametric comparison, and design notes not aggregated on any single manufacturer or distributor page, providing a faster engineering reference than individual datasheet searches.

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PIC16C56AT-04/SS - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip
PIC16C56AT-04/SS

PIC16C56AT-04/SS - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip

The Microchip Technology PIC16C56AT-04/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at up to 4MHz with 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, packaged in a 20-pin SSOP (Shrink Small Outline Package). The 'T' suffix denotes tape-and-reel packaging, '/SS' indicates the SSOP-20 footprint, and the '-04' speed grade specifies the 4MHz maximum clock frequency. The device targets cost-sensitive, high-volume embedded applications where deterministic RISC execution and minimal external component count are critical. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and programmable I/O peripherals. 8-bit MCUs such as the PIC16C5X occupy the low-cost, low-power segment of the embedded market, making them well-suited for appliance control, sensor signal conditioning, and standalone industrial timers where 16- or 32-bit processing is unnecessary. The PIC family uses a Harvard RISC architecture with 12-bit-wide instructions and only 33 single-word instructions, achieving 2:1 code compression over competing 8-bit architectures. Key features of the PIC16C56AT-04/SS include 25 bytes of RAM, 12 digital I/O pins, an internal oscillator option, a Watchdog Timer with its own on-chip RC oscillator, and power-saving SLEEP mode. The device operates from 3.0V to 5.5V across the commercial 0C to +70C temperature range, drawing only a few mA active and microamp-level current in SLEEP. The fully static CMOS design allows the clock to be stopped without losing register contents, simplifying low‑power sequencing. The PIC16C5X architecture is a classic RISC implementation with a two-stage pipeline, allowing most instructions to execute in a single 250ns instruction cycle at 4MHz. The 12-bit instruction word keeps program memory density high, and the 8-bit-wide data path is sufficient for byte-oriented control loops. Peripherals are limited intentionally to keep die size and cost low: timer/counter, GPIO, and reset logic are the primary on-chip resources. OTP program memory allows the customer to write the device once at production time, ideal for mature, fixed-function products. Typical applications for the PIC16C56AT-04/SS include simple motor and solenoid drivers, low-end consumer appliance control (coffee makers, handhelds, toys), LED sequencing modules, automotive interior accessories, and small sensor-interface boards. The 12 I/O pins are adequate for keypad scanning, relay driving, and UART-style bit-banged communication. Because OTP is one-time programmable, this part is best suited for high-volume production where firmware is finalized before mask programming. When designing with this device, plan for an in-circuit serial programming (ICSP) header even on production boards so OTP can be written after PCB assembly. Decouple VDD with a 100nF ceramic capacitor placed within 5mm of the pin, and provide a clean MCLR reset path with the recommended 10k pull-up. If in-application reprogrammability is required, consider a flash-based PIC16F5X equivalent. This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC16C5X family, and practical design notes that complement the manufacturer datasheet.

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PIC16C56AT-04E/SO - 8-bit OTP MCU, 4MHz, 1.5KB | Microchip
PIC16C56AT-04E/SO

PIC16C56AT-04E/SO - 8-bit OTP MCU, 4MHz, 1.5KB | Microchip

The Microchip Technology PIC16C56AT-04E/SO is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C5X family, delivering 4 MHz CPU performance with 1.5 KB (1K x 12) of one-time-programmable program memory and 25 bytes of RAM in an 18-pin SOIC package. It integrates 12 digital I/O lines, an 8-bit timer with watchdog, power-on reset, and a RISC architecture that executes most instructions in a single 250 ns cycle. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces on one silicon die. The PIC16C5X family belongs to the 8-bit microcontroller taxonomy, sitting beneath broader categories of microcontrollers, embedded processors, and finally integrated circuits. These classic PIC MCUs serve cost-sensitive, deterministic control applications where 12-bit wide instructions deliver 2:1 code compression versus competing 8-bit architectures of the same era. Key features include an extended operating temperature range of -40C to +125C (the 'E' suffix), 4 MHz maximum clock at 4 MHz crystal/RC oscillator input, 12 I/O pins with high-current sink/source capability, an 8-bit real-time timer/counter, watchdog timer with on-chip RC oscillator, power-on reset, and code protection. The 18-SOIC (0.295 inch / 7.50 mm width) package supports legacy surface-mount designs with reliable hand-soldering and standard IR reflow profiles. The PIC16C56AT uses an enhanced Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and data access. Its 33 single-word instructions and 12-bit-wide instruction word simplify compiler output and hand-coded assembly, while the fully static design enables operation down to DC clock speeds for low-power sleep implementations. Typical applications include appliance control, automotive sub-systems (body electronics, lighting controllers), industrial sensor interfaces, simple motor control, smart card readers, and battery-powered instrument front-ends. The 1.5 KB program memory fits state-machine logic, lookup tables, and small protocol stacks including I2C bit-banging or LIN slave handlers. When designing with this device, note that the OTP memory cannot be reprogrammed - choose the PIC16F56 flash sibling or PIC16C56A-20/SO windowed ceramic-package variant for development. Decoupling VDD with 0.1 uF close to the pins is mandatory; the MCLR reset pin requires a pull-up for normal operation. This page synthesizes distributor inventory, parametric alternatives, and practical design notes beyond the manufacturer datasheet, helping engineers source, qualify, and design-in the PIC16C56AT-04E/SO with confidence.

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PIC16C56AT-20/SO - 8-bit OTP MCU 1.5KB ROM 20MHz SOIC-18
PIC16C56AT-20/SO

PIC16C56AT-20/SO - 8-bit OTP MCU 1.5KB ROM 20MHz SOIC-18

The Microchip Technology PIC16C56AT-20/SO is an 8-bit EPROM/ROM-based CMOS microcontroller belonging to the PIC16C5X family, supplied in a 18-lead small-outline (SOIC-18 / "SO") package and rated for 20 MHz maximum clock operation. It integrates 1.5 KB (1K x 12) of One-Time Programmable (OTP) program memory and 25 bytes of general-purpose SRAM, packaged in a gull-wing surface-mount SOIC outline suitable for hand-soldered prototyping and automated assembly. According to the manufacturer datasheet and distributor listings, the device is commercial temperature grade with 12 bidirectional digital I/O pins arranged across two ports (GPIO/RA and GPB/RC depending on sub-variant) and is intended for cost-sensitive embedded control applications. The PIC16C56A sub-family is a superset of the original PIC16C56, adding an additional 8-bit I/O port, edge-selectable interrupts, higher drive current, and a wider operating voltage envelope versus the legacy PIC16C56. Background Knowledge: An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path and one-time-programmable (OTP) EPROM or ROM program memory. The PIC16C5X family uses a 12-bit wide instruction word with a Harvard architecture, separating program and data memory for deterministic single-cycle instruction execution. As a member of the broader microcontroller class (microcontroller -> MCU -> embedded controller -> semiconductor), the PIC16C56A belongs to the RISC subset, executes one instruction per instruction cycle (four clock periods), and is offered in masked-ROM (PIC16C56), UV-erasable windowed (PIC16C56 JW), and one-time-programmable EPROM (PIC16C56A) variants, with the "T" suffix denoting the tape-and-reel packaging option. Key features include 12 I/O pins, 20 MHz maximum oscillator input, a 33-instruction RISC instruction set, on-chip power-on reset, watchdog timer with its own on-chip RC oscillator, internal MCLR reset input, programmable code protection, power-saving SLEEP mode, and selectable oscillator configurations (RC, LP, XT, HS, external clock). The 20 in the part number suffix designates the 20 MHz speed grade, the T denotes tape-and-reel, and /SO denotes the SOIC-18 wide-body small-outline package. Typical applications span consumer appliances, automotive subsystems (non-safety), industrial control nodes, sensor interfaces, and low-cost battery-powered devices that benefit from deterministic single-cycle RISC execution and a mature toolchain based on MPLAB IDE and the MP3/MPLAB PM3 device programmer. When designing with the PIC16C56AT-20/SO, ensure the Vdd decoupling network (typically 0.1 µF ceramic in parallel with a bulk tantalum/electrolytic cap) is placed within 10 mm of the supply pin, and respect the maximum I/O sink/source ratings per pin and per port.

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PIC16C56AT-20/SS - 8-bit OTP MCU, 1.5KB, 12 I/O, 20MHz | Microchip
PIC16C56AT-20/SS

PIC16C56AT-20/SS - 8-bit OTP MCU, 1.5KB, 12 I/O, 20MHz | Microchip

The Microchip Technology PIC16C56AT-20/SS is an 8-bit RISC CMOS microcontroller from the PIC16C5x baseline family, featuring 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of data RAM, and 12 digital I/O pins. It executes instructions at a 20MHz clock rate from a 4.5V to 5.5V supply, and is housed in a 20-pin SSOP package with tape-and-reel packaging for high-volume surface-mount assembly. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and configurable I/O peripherals onto one silicon die. Within the semiconductor hierarchy, the PIC16C5x sits below modern 32-bit Cortex-M parts and above simple logic ICs, serving as a low-cost, deterministic, ultra-low-power embedded controller. OTP memory means the program is written once and cannot be electrically erased, which lowers per-unit cost versus flash-based MCUs while still supporting in-circuit programming at production. Key features of this part include the PIC RISC architecture with 33 single-word/single-cycle instructions (12-bit wide), 2:1 code compression versus competitive 8-bit MCUs, a hardware 8-bit timer/counter with optional prescaler, watchdog timer for reliability, Power-on Reset, brown-out detection, and a wide commercial operating temperature range. The 12 I/O pins can each drive or sink up to 25mA, enabling direct LED or relay drive without external buffers. Typical applications include low-cost consumer appliance control, simple sensor interfaces, battery-powered remote controls, LED lighting controllers, smoke-detector logic boards, and industrial timers. Its deterministic instruction timing and small footprint also make it useful in legacy system upgrades where a proven 8-bit baseline MCU is required. When designing with this device, plan the OTP programming step into the production line - the 'A' suffix indicates an automotive-qualified temperature grade, while the 'T' suffix denotes tape-and-reel packaging. Decoupling the VDD pin with a 100nF ceramic capacitor placed within 5mm of the package is strongly recommended for noise immunity.

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PIC16C56AT-20E/SO - 8-Bit 20MHz OTP MCU 1.5KB | Microchip
PIC16C56AT-20E/SO

PIC16C56AT-20E/SO - 8-Bit 20MHz OTP MCU 1.5KB | Microchip

The Microchip PIC16C56AT-20E/SO is an 8-bit RISC microcontroller from the PIC16C5X family, providing 1.5KB (1K x 12) of One-Time-Programmable (OTP) EPROM program memory, 25 bytes of RAM, and 12 I/O pins in an 18-pin SOIC wide-body package. It executes instructions at a 20 MHz maximum clock rate, delivering up to 5 MIPS of throughput from a Harvard-architecture core with a 12-bit wide instruction word that yields 2:1 code compression versus typical 8-bit CISC microcontrollers. The device operates from a single 3.0 V to 5.5 V supply and features Power-on Reset (POR), Watchdog Timer (WDT), and a wide -40 °C to +125 °C extended operating temperature range suitable for industrial and automotive-grade designs. 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 PIC16C5X family belongs to the broader category of 8-bit microcontrollers -> embedded controllers -> microprocessors -> semiconductors. These MCUs are designed for deterministic, low-cost embedded control where bit-manipulation efficiency, low power draw, and small code footprint outweigh the need for high MIPS. Within a system, the PIC16C56A typically serves as the master controller, replacing discrete logic and reducing BOM count on simple sensor, motor, and human-interface boards. Key features of the PIC16C56AT-20E/SO include its 33 single-word instructions, 2-level hardware stack, 8-bit timer/counter with 8-bit programmable prescaler, direct LED drive capability on all port pins, and low-power consumption of typically < 2 mA at 5 V and 20 MHz. The OTP EPROM memory enables fast prototyping and low-volume production runs while keeping per-unit cost low, and the 12-bit instruction set simplifies compiler and assembler porting versus 14-bit or 16-bit PIC cores. Typical applications include automotive body controllers, appliance control boards, sensor signal conditioning, low-end remote-control transmitters, and simple user-interface panels. Because the part is offered in tape-and-reel packaging with an automotive temperature grade, it is well-suited for in-cabin automotive modules and white-goods designs that must survive extended thermal stress. When designing with this device, note that OTP memory can be programmed only once, so firmware should be fully validated before commitment. Decoupling VDD with a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin is recommended, and unused I/O pins should be configured as outputs low to minimize quiescent current draw. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes that go beyond the manufacturer datasheet to accelerate BOM qualification and supply-chain risk mitigation.

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PIC16C56AT-20E/SS - 8-Bit 20MHz 1.5KB OTP MCU 20-SSOP | Microchip
PIC16C56AT-20E/SS

PIC16C56AT-20E/SS - 8-Bit 20MHz 1.5KB OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C56AT-20E/SS is an 8-bit CMOS RISC microcontroller from the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and 12 I/O pins, housed in a 20-pin SSOP package. It operates up to 20MHz at 5V and includes essential peripherals such as Power-On Reset (POR) and a Watchdog Timer (WDT), making it a compact, deterministic control core for cost-sensitive embedded applications. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral interfaces on one die. The PIC16C5X family belongs to the broader category of 8-bit microcontrollers -> RISC microcontrollers -> embedded controllers -> semiconductor ICs, and represents one of the earliest commercially successful Harvard-architecture MCU lines from Microchip. Its 12-bit wide instructions provide roughly 2:1 code compression over typical 8-bit CISC contemporaries, which was a key selling point in the 1990s and remains attractive for tight assembly routines. Key features of the PIC16C56AT-20E/SS include a fully static CMOS design that allows the clock to be stopped without losing register state, a wide 3.0V to 6.0V operating range, a low-power sleep mode that drops supply current to the microampere range, and a 20MHz maximum clock frequency at 5V that yields a 200ns instruction cycle. The 12 I/O pins are bidirectional with individually programmable direction registers, and the 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler is sufficient for basic event counting and PWM generation. The OTP program memory and 25-byte RAM make the device suitable for high-volume, fixed-function appliances where firmware is finalized at production time. Architecture-wise, the PIC16C56A uses a 14-bit instruction word with a two-stage pipeline (fetch/execute overlap), enabling most instructions to complete in one instruction cycle. The device has no interrupt controller, only a single hardware interrupt source from the TMR0 overflow and the external GP2/INT pin, which keeps the silicon small and the firmware deterministic. Peripherals are kept to a minimum to reduce cost: POR, WDT, TMR0, and the I/O ports. The 'E' suffix denotes the Enhanced (-40C to +125C) operating temperature range, and the 'T' in the part number indicates Tape & Reel packaging. The '20' speed suffix specifies the 20MHz maximum clock. Typical applications include small appliance controllers (rice cookers, microwave oven keypads, washing-machine front panels), battery chargers, toys and educational electronics, remote control transmitters, low-cost sensor interface boards, and replacement logic for legacy designs in industrial control panels. The wide supply range and small SSOP footprint also suit handheld instrumentation and consumer white goods. When designing with this part, note that OTP memory cannot be re-programmed; prototypes should use a windowed ceramic or flash-based PIC16F5X equivalent for firmware development. The 25-byte RAM constraint forces tight stack and variable management, and the absence of a hardware multiplier means multiply operations must be performed in software. This page synthesizes distributor pricing, drop-in compatible PIC16C5X family alternatives, and design considerations not typically compiled in the manufacturer datasheet, helping engineers compare the PIC16C56AT-20E/SS against modern flash-based and OTP replacements in the same SSOP-20 footprint.

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PIC16C56AT-40/SS - 8-bit 40MHz OTP MCU 1.5KB | Microchip
PIC16C56AT-40/SS

PIC16C56AT-40/SS - 8-bit 40MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56AT-40/SS is an 8-bit RISC microcontroller from the PIC® 16C family, delivering 40 MHz maximum clock speed with 1.5 KB (1K x 12) of One-Time Programmable (OTP) program memory, packaged in a 20-pin SSOP (Shrink Small Outline Package, 5.30 mm body width). It features 25 bytes of RAM, 12 I/O pins, Power-On Reset (POR), and a Watchdog Timer (WDT). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one silicon die. The 8-bit PIC architecture uses a RISC (Reduced Instruction Set Computer) instruction set with a fixed program word width of 12 bits in this family, enabling single-cycle instruction execution at the oscillator clock rate. MCUs serve as the embedded intelligence in countless products, from consumer appliances to industrial controllers, forming the lowest tier of the computing hierarchy: microcontroller -> embedded processor -> microprocessor. The OTP memory variant is factory- or field-programmed once and cannot be erased, which lowers die cost for high-volume production runs. Key features of the PIC16C56AT-40/SS include its 40 MHz maximum operating frequency, 1.5 KB OTP program memory (1K x 12 organization), 25 bytes of general-purpose RAM, 12 digital I/O pins, two 8-bit timers, a watchdog timer for runaway code recovery, and Power-On Reset. It is offered in the commercial temperature grade (0 °C to +70 °C) per the slash-SPEC ordering code "40" suffix convention, with an operating voltage range typically of 3.0 V to 6.0 V across the PIC16C5X family. Technically, the PIC16C56A core uses a Harvard architecture with separate program and data buses. The 12-bit instruction word delivers deterministic single-cycle execution for most instructions and a 33-instruction set. With 25 bytes of file-register RAM and a 2-level hardware stack, this device targets simple control loops where deterministic timing and low cost outweigh deep memory and modern peripherals. Typical applications include appliance control boards, HVAC thermostat logic, simple sensor signal conditioning, LED driver controllers, and legacy industrial control replacement. The 40 MHz clock rate enables sub-microsecond bit-banging for protocol emulation, while 12 I/O pins are sufficient for keypad scan, relay drive, and indicator-LED multiplexing. When designing with this part, account for OTP programming cost during development: OTP parts cannot be re-programmed, so production must use pre-programmed parts. For development, the windowed (JW) or flash (F) variants in the broader PIC16 family are recommended. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on any single manufacturer or distributor page, providing a single reference point for engineers qualifying the PIC16C56AT-40/SS for new designs or legacy board replacements.

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