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PIC16C54C-20I/SS - 8-bit 20MHz OTP MCU, 12 I/O, SSOP-20
PIC16C54C-20I/SS

PIC16C54C-20I/SS - 8-bit 20MHz OTP MCU, 12 I/O, SSOP-20

The Microchip Technology PIC16C54C-20I/SS is an 8-bit CMOS RISC microcontroller from the PIC16C5x family, operating at up to 20 MHz and housed in a 20-pin SSOP package. It integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and 12 general-purpose digital I/O pins. The 'C' suffix denotes the OTP EPROM-based variant and the 'I' suffix denotes the industrial temperature grade of -40C to +85C, while '-20' specifies the 20 MHz maximum clock rate. What is a PIC16C5x microcontroller? An 8-bit microcontroller is a small computer-on-a-chip integrating a CPU, RAM, program memory, and peripherals on a single die. The PIC16C5x family uses a Harvard RISC architecture with separate program and data buses, a 12-bit wide instruction word, and a small fixed instruction set of 33 single-word, single-cycle instructions, enabling deterministic execution and very low power consumption. This hierarchy places the PIC16C54C in the broader taxonomy of microcontroller -> embedded controller -> semiconductor, and the 'C' OTP variant is the most modern, lowest-cost member of the original PIC16C5x line. Key features include a two-level deep hardware call stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler, power-on reset (POR), a Watchdog Timer (WDT) with its own on-chip RC oscillator, and an internal/external oscillator option. The device operates from 4.5V to 5.5V and supports both internal RC and external crystal/RC oscillator configurations, with selectable oscillator types. Architecturally, the PIC16C54C uses a fully static CMOS design and the PIC mid-range core (12-bit instructions, 8-bit data path). Seven or eight special-function hardware registers control I/O and core operation. Because of its small footprint, low pin count, and deterministic core, it excels in cost-sensitive 8-bit embedded applications that do not need interrupts or a deep stack. Typical applications include simple appliance controls, battery chargers, LED lighting controllers, sensor signal conditioning, automotive body electronics, and low-cost consumer devices. The SSOP-20 package (0.209 inch / 5.30 mm body width) supports compact PCB designs. Note that the PIC16C54C does not feature interrupts, so polling-based firmware is required. Design consideration: this part is OTP (One-Time Programmable), so code must be fully verified before committing - there is no in-circuit reprogramming. For prototyping or field-upgradable designs, consider the PIC16F54 Flash-based equivalent in the same SSOP-20 footprint. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on a bare manufacturer product page.

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PIC16C54C-40/P - 8-Bit OTP MCU, 20 MHz, 512B EPROM | Microchip
PIC16C54C-40/P

PIC16C54C-40/P - 8-Bit OTP MCU, 20 MHz, 512B EPROM | Microchip

The Microchip PIC16C54C-40/P is an EPROM/ROM-based 8-bit CMOS microcontroller in the PIC16 family, offering RISC architecture in an 18-pin PDIP through-hole package with 512 bytes of EPROM program memory. It supports dual-voltage operation at 3.3V and 5V rails, runs at up to 20 MHz clock speed, and is targeted at high-volume embedded control applications where OTP (one-time programmable) memory, low cost, and a compact DIP footprint are the primary design drivers. Operating temperature grade is commercial, and lifecycle status is active per current Microchip product records. What is a PIC16C5x microcontroller? The PIC16C5x family is the original baseline 8-bit RISC architecture from Microchip, featuring only 33 single-word instructions and a 12-bit instruction word. Compared with the later PIC16F and PIC18 families, the PIC16C5x family deliberately sacrifices advanced peripherals (no on-chip debug, no interrupts, no in-circuit re-programmability) in exchange for an extremely small die size, very low cost, and simple timing behavior. The 'C' revision in PIC16C54C refined the original 16C54A silicon for 4.5-5.5V operation with better brown-out characteristics and improved oscillator stability, and the -40 speed grade permits an external clock up to 20 MHz yielding roughly a 100 ns instruction cycle. Key features include 12 I/O pins, two 8-bit timers, a watchdog timer, a power-on reset circuit, and a wide 4.5-5.5V supply voltage range with explicit 3.3V/5V dual-rail operation. The '40' speed suffix means 40 MHz oscillator at 5V (i.e., internal 4:1 divider yields a 10 MHz instruction rate, which is the 40 suffix naming convention used by Microchip). EPROM-based OTP memory allows pre-programming at the factory or field programming via a universal programmer, eliminating need for an external boot loader or serial interface. The 18-pin PDIP package supports hand-soldering and breadboard prototyping, making the device popular in educational, hobbyist, and legacy industrial designs. Architecturally, the PIC16C54C uses a Harvard architecture with separate program (EPROM) and data (RAM) buses. The PIC16C5x core has no interrupt controller and uses a polled/sequential software design pattern. Program memory address space is 512 words wide (9-bit PC), data RAM is 25 bytes, and the stack is two-level hardware, restricting call nesting to two subroutine levels. Hardware multipliers and divide peripherals are absent; math is performed in software. These architectural constraints trade flexibility for deterministic real-time behavior at very low unit cost. Typical applications include simple motor-control PWM, LED sequencers, low-end appliance controllers, hobby robotics, and educational microcontroller platforms. The wide 3.3V/5V supply tolerance also allows battery-backed designs and 5V industrial bus interfaces. Engineers often migrate to PIC16F54 (Flash) for active prototyping and PIC16C54C-40/P for production runs where OTP cost savings outweigh re-programmability. When designing with this part, ensure external oscillator stability by using a properly sized load capacitor (typically 15-33 pF for a standard crystal). The lack of interrupts means polling loops dominate the firmware architecture; allocate worst-case timing in the main loop to maintain deterministic control. For new designs, also consider PIC16F54-I/P as a Flash-equivalent drop-in for prototyping, then qualify the OTP version for production. This page synthesizes distributor pricing, parametric drop-in alternatives, application guidance, and design notes that go beyond the bare content of the manufacturer datasheet to help engineers choose, source, and apply the PIC16C54C-40/P with confidence.

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PIC16C54C-40/SO - 40MHz 8-Bit OTP MCU, SOIC-18 | Microchip
PIC16C54C-40/SO

PIC16C54C-40/SO - 40MHz 8-Bit OTP MCU, SOIC-18 | Microchip

The Microchip Technology PIC16C54C-40/SO is an EPROM/ROM-based 8-bit CMOS microcontroller delivering up to 40 MHz clock speed, 0.75 KB program memory, 25 bytes RAM, and 12 I/O pins in an 18-pin SOIC package. It belongs to the PIC16C5X family of RISC microcontrollers, with 12-bit wide instructions providing 2:1 code compression over competing architectures in the same price category. An 8-bit microcontroller is a single-chip computer that integrates a CPU, memory, and peripherals onto one die. Within the broader taxonomy, the PIC16C54C sits at the microcontrollers -> integrated circuits -> semiconductors hierarchy. EPROM/ROM-based parts like this one are One-Time-Programmable (OTP), meaning the program memory can be written once by the user using an external programmer and is then permanent - suitable for production volumes where firmware is fixed. Key features include a 40 MHz maximum clock frequency, 0.75 KB (768 words) of OTP program memory, 25 bytes of RAM data memory, 12 digital I/O pins, a 4 MHz internal oscillator option, and a wide 3.0V to 5.5V supply range. The device uses a Harvard RISC architecture with 33 single-word/cycle instructions and a 12-bit instruction word. Its commercial temperature grade (0°C to +70°C) targets cost-sensitive embedded designs. The PIC16C54C uses Microchip's classic PIC16C5X core with two-stage pipeline, watchdog timer, and on-chip RC oscillator. Its OTP EPROM cell is field-erasable via windowed packages for prototyping. The 12-bit instruction word is symmetrical and easy to learn, with most instructions executing in a single instruction cycle except for program branches (two cycles). Current consumption is around 1.8 mA at 5V/4 MHz and lower than 10 µA in sleep mode. Typical applications include low-cost consumer appliances, simple sensor controllers, replacement of discrete logic, automotive body electronics (using the PIC16C54C-40I industrial-grade variant), industrial timers and counters, and remote control transmitters. The wide 12 I/O count supports direct drive of LEDs, relays, and keypads without external glue logic. When designing with this device, consider migrating to PIC16F54-I/SO for new designs, since the PIC16C54C is rated 'Not Recommended for new designs' by Microchip. The Flash-based PIC16F54 is pin-compatible, electrically identical, and in active production. For supply-chain resilience, also evaluate the SOIC-18 / SSOP-20 footprint options. This page synthesizes current distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet. Information verified 2026-09-16.

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PIC16C54C-40/SS - 8-bit 40MHz OTP MCU 512B EPROM | Microchip
PIC16C54C-40/SS

PIC16C54C-40/SS - 8-bit 40MHz OTP MCU 512B EPROM | Microchip

The Microchip PIC16C54C-40/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C5X family, operating at up to 40 MHz clock speed with a 512 x 12-bit (768 byte) one-time-programmable program memory, 25 bytes of RAM, and 12 I/O pins. It is housed in a 20-pin SSOP package with a commercial operating temperature grade and supports a supply voltage range of 3.3V to 5.5V (4.5V to 5.5V per the datasheet's parametric table). 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 silicon die. The PIC16C5X family belongs to the baseline RISC architecture family from Microchip - a class of ultra-small microcontrollers characterized by a 12-bit instruction word, 33 single-cycle instructions, and a two-stack hardware call depth. In the broader taxonomy, an MCU sits below microprocessor and above ASIC: it is a programmable logic device used for embedded control, distinguishing it from fixed-function power management ICs, amplifiers, and interface ICs. Key features of the PIC16C54C-40/SS include 33 single-cycle instructions (200 ns instruction cycle at 20 MHz oscillator), an 8-bit timer/counter with 8-bit programmable prescaler, a watchdog timer with on-chip RC oscillator, power-on reset, and code protection. The 40 MHz speed grade is the fastest variant in the family. The 12 I/O pins each source up to 20 mA and sink up to 25 mA, sufficient to drive LEDs and small relays directly without buffer transistors. The PIC16C54C uses a Harvard RISC architecture with separate program and data buses, allowing instruction fetch to occur in parallel with data access. The reduced instruction set and predictable single-cycle execution simplify real-time control loops. The 8-bit data path and 12-bit instruction width make this device code-density optimized for small state machines rather than numeric processing. Typical applications include automotive subsystems (body controllers, remote keyless entry transmitters), appliance control (microwave ovens, washing machines, coffee makers), industrial remote controls, security systems, and low-end consumer electronics. The 12-bit instruction word gives unusually high code density for a RISC MCU, allowing small programs to fit in the 512-word OTP. When designing with this part, note that the EPROM (one-time-programmable) memory cannot be erased, so plan for code-development using a windowed CERDIP version before committing to OTP for production. The 2-level hardware stack supports only two nested subroutine calls - structured programs must avoid deep nesting or simulate additional stack depth in software. This page synthesizes distributor pricing, drop-in pin-compatible alternatives from the same PIC16C5X family, and practical design notes not collected in any single datasheet, complementing the manufacturer documentation with procurement-grade data.

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PIC16C54C/JW - 8-bit EPROM MCU, 12 I/O, 20MHz | Microchip
PIC16C54C/JW

PIC16C54C/JW - 8-bit EPROM MCU, 12 I/O, 20MHz | Microchip

The Microchip Technology PIC16C54C/JW is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, offering 768 bytes of program memory organized as 512 x 12 bits in an 18-pin CERDIP windowed package. The part runs at up to 20 MHz, integrates 25 bytes of RAM, and exposes 12 general-purpose digital I/O pins, with a wide 2.5V to 5.5V operating range that covers both 3.3V and 5V rails. A microcontroller (MCU) is a single-chip computer that combines a CPU, non-volatile program memory, working RAM, and configurable I/O peripherals on one die; the PIC16C5X line is one of the earliest RISC-architecture 8-bit MCUs from Microchip. In the system hierarchy, an MCU sits beneath SoCs and microprocessors and above bare gate-array logic, and the PIC16C54C/JW belongs to the EPROM-based subclass that allows in-circuit erasure via a quartz window under UV light - useful for development and low-volume engineering builds where firmware iteration is required. Key features of the PIC16C54C/JW include a 12-bit instruction word with 33 single-word/single-cycle instructions, a two-level deep hardware stack, seven or eight special function hardware registers, and one 8-bit real-time counter/timer (TMR0). The RISC core delivers close to 1 MIPS per MHz, giving the 20MHz part about 5 MIPS sustained throughput. Direct, indirect, and relative addressing modes are supported for both data and instructions, and an internal power-on reset plus watchdog timer simplify external reset hardware. Typical applications for the PIC16C54C/JW include automotive body controllers, industrial appliance controls, security system peripherals, simple sensor signal conditioning, and legacy embedded products that were originally designed around the PIC16C5X family. The windowed CERDIP package makes it especially attractive for prototype and field-reprogrammable deployments where OTP variants like the PIC16C54C-04/P cannot be reused after programming. When designing with this device, keep brown-out detection and external oscillator requirements in mind; the JW windowed package is intended for development, while the production plastic DIP (P), SOIC (SO), and SSOP (SS) variants of the same die are recommended for volume runs. Verify the latest errata before committing to new designs because the PIC16C54C is part of Microchip's mature product line with periodic device revisions.

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PIC16C54CT-04/SO - 8-Bit 4MHz OTP MCU 768B | Microchip
PIC16C54CT-04/SO

PIC16C54CT-04/SO - 8-Bit 4MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54CT-04/SO is an 8-bit CMOS RISC microcontroller from the PIC16C5x family, offered in an 18-pin SOIC package with 4 MHz maximum clock speed and 768 bytes (512 x 12) of one-time-programmable (OTP) program memory. It provides 25 bytes of data RAM and 12 general-purpose digital I/O pins, all packaged in a 0.295 inch (7.50 mm) wide SOIC-18 outline suitable for surface-mount production. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), data memory (RAM), and peripheral interfaces into one IC. PIC microcontrollers from Microchip use a Harvard RISC architecture with a small, fixed-length instruction set, which simplifies pipelining and enables deterministic instruction timing. PIC16C5x parts are EPROM/ROM-based; the OTP variant on the PIC16C54C is factory or prototype programmable, contrasting with later PIC16F parts that use Flash memory. The PIC16C54C runs from 3.0 V to 5.5 V, has a 33-instruction set, 12-bit-wide instructions yielding roughly 2:1 code compression over typical 8-bit CISC MCUs of its era, and supports in-circuit serial programming (ICSP) via dedicated pins. It features a 4 MHz internal-execution rate, watchdog timer with on-chip RC oscillator, power-on reset, and a wide operating temperature range suited to commercial embedded products. A separate PIC16LC54C variant lowers power consumption at reduced clock speeds. The architecture is a fully static CMOS design, eliminating minimum clock-frequency restrictions and enabling low-power sleep modes. The 12-bit instruction word and 8-bit data path produce compact code, while the 33-instruction set reduces development time. A two-stage pipeline overlaps fetch and execute, and the part is built around a 12-bit program counter that limits direct addressing to 2K words of program memory. Typical applications include low-cost consumer appliances, simple sensor and motor control nodes, battery chargers, remote controls, intelligent LED drivers, and industrial timers where cost dominates over computational throughput. Because of its 12 I/O pins and modest peripheral set, designers often pair the PIC16C54C with external driver ICs and analog front-ends. When designing with this part, plan oscillator and reset circuitry carefully: a 4 MHz ceramic resonator with the appropriate load capacitors gives a stable clock, and the MCLR pin needs a proper pull-up reset network. Use ICSP for prototype flashing before committing to the OTP pattern. This page synthesizes distributor stock and pricing, drop-in PIC16C5x replacements in the same SOIC-18 footprint, and application/design notes drawn from Microchip datasheets that go beyond a single product listing.

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PIC16C54CT-04/SS - 4MHz 8-Bit OTP MCU, 768B | Microchip
PIC16C54CT-04/SS

PIC16C54CT-04/SS - 4MHz 8-Bit OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54CT-04/SS is an 8-bit CMOS EPROM-based microcontroller belonging to the PIC16C5X family, operating at up to 4MHz and packaged in a 20-pin SSOP (Shrink Small Outline Package). It integrates 768 bytes of OTP program memory (organized as 512 x 12-bit words) and 25 bytes of general-purpose RAM, with 12 digital I/O lines grouped across ports A and B. The 'C' suffix designates the CMOS revision with a 4MHz maximum clock, and the '04' speed code confirms a 4MHz oscillator rating. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and peripherals into one device. The PIC16C5X series is one of the original baseline architectures in the PIC family, employing a RISC-like 12-bit instruction word that delivers approximately 2:1 code compression versus competing 8-bit CISC MCUs, enabling compact program storage for embedded control tasks. Within the broader taxonomy, the PIC16C54 sits below mid-range PIC16 devices in capability but offers the lowest cost and smallest footprint in the family. Key features of the PIC16C54CT-04/SS include a fully static CMOS design that allows clock frequencies down to DC, a wide 4.5V to 5.5V supply range, a hardware watchdog timer for unattended recovery, a power-on reset circuit, and a sleep mode for low-power standby. The OTP (One-Time Programmable) EPROM memory is factory- or field-programmable using Microchip's development tools, and the SSOP-20 footprint supports high-density surface-mount assembly on space-constrained boards. Twelve I/O pins can each sink or source up to 25 mA, sufficient for direct LED drive. Internally the PIC16C54C revision uses a 2-stage pipeline RISC core with 33 single-word instructions, all executing in a single instruction cycle except branches. A dedicated 8-bit timer/counter (TMR0) with an 8-bit prescaler supports event counting and timing applications. The device has no on-chip peripherals beyond the timer and watchdog, which simplifies firmware development and reduces cost versus higher-tier PIC16F variants. Typical applications include low-cost consumer appliances, remote-control transmitters, simple sensor interfaces, battery chargers, LED drivers, automotive body electronics (non-safety-critical), and educational or hobbyist embedded platforms. Its small SSOP-20 footprint makes it attractive for hand-held and wearable form factors where PCB real estate is at a premium. When designing with the PIC16C54CT-04/SS, note that OTP memory cannot be erased, so any firmware revision requires a new part; for prototyping, choose the windowed CERDIP PIC16C54C-04/JW variant. Use a 4MHz ceramic resonator or crystal across OSC1/OSC2 and place decoupling capacitors within 5 mm of VDD and VSS pins. This page consolidates distributor pricing, verified drop-in alternative listings, and practical design guidance beyond what is typically available in the manufacturer datasheet alone.

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PIC16C54CT-04E/SO - 8-bit OTP MCU 4MHz 768B | Microchip
PIC16C54CT-04E/SO

PIC16C54CT-04E/SO - 8-bit OTP MCU 4MHz 768B | Microchip

The Microchip PIC16C54CT-04E/SO is an 8-bit CMOS RISC microcontroller from the PIC® 16C family, operating at up to 4 MHz and offering 768 bytes (512 × 12) of One-Time Programmable (OTP) program memory in an 18-pin SOIC (SO) package. It delivers RISC performance in the 4.5V–5.5V supply range with 12 I/O lines, 25 bytes of RAM, and a 12-bit instruction word that achieves 2:1 code compression over competing 8-bit MCUs in the same price class. A PIC (Peripheral Interface Controller) microcontroller is a compact, single-chip computer that integrates a CPU, non-volatile program memory, RAM, and peripheral I/O on one die. The PIC16C5X sub-family is the original baseline PIC architecture, optimized for simple control tasks such as appliance logic, sensor interfacing, and low-cost embedded control. Within the broader taxonomy, it sits as: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The 'C' ROM variant uses one-time-programmable EPROM, distinguishing it from later 'F' Flash and 'CR' ROM versions. Key features include the 4 MHz oscillator input (the '04' speed suffix), 33 single-word instructions, a two-level hardware stack, 8-bit timer/counter, and a watchdog timer with its own on-chip RC oscillator. The device supports in-circuit serial programming via the ICSP interface (RB6/RB7) and offers power-on reset, power-up timer, and oscillator start-up timer for clean brown-out behavior without external reset circuitry. The PIC16C54C uses a Harvard architecture with separate program and data buses, executing most instructions in a single 1 µs instruction cycle at 4 MHz. Its 12-bit wide, highly symmetrical instruction set delivers the 2:1 code density advantage that made the 16C5X series the workhorse of cost-sensitive embedded designs in the 1990s and remains in production for long-life-cycle industrial and appliance platforms. Typical applications include appliance control (washing machines, microwave ovens, HVAC actuators), simple sensor signal conditioning, automotive interior accessories, industrial timing and sequencing, remote controls, and battery chargers. The wide 4.5–5.5V supply range and integrated peripherals make it well-suited for replacing discrete logic in space- and cost-constrained designs. When designing with the PIC16C54CT-04E/SO, note that the 'E' suffix indicates the extended industrial temperature grade (-40°C to +125°C) and 'T' denotes tape-and-reel packaging. The 4 MHz internal instruction throughput allows 1 million instructions per second, sufficient for slow control loops but not for real-time DSP or high-bandwidth communication. This page synthesizes distributor pricing, drop-in alternatives from the PIC16C54C family, and practical design notes not found in the standalone manufacturer datasheet, helping engineers select the correct OTP/EPROM variant and package for legacy and new designs.

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PIC16C54CT-04I/SO - 8-bit OTP MCU, 4MHz, 12 I/O, SOIC-18 | Microchip
PIC16C54CT-04I/SO

PIC16C54CT-04I/SO - 8-bit OTP MCU, 4MHz, 12 I/O, SOIC-18 | Microchip

The Microchip Technology PIC16C54CT-04I/SO is an 8-bit CMOS microcontroller based on the PIC® 16C family, featuring a 4 MHz maximum operating frequency, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 25 bytes of RAM, housed in an 18-pin SOIC package with 12 I/O pins and an industrial -40C to +85C operating temperature range. An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, program memory, RAM, and peripherals on a single die. Within the broader hierarchy, an MCU belongs to the embedded processor family, sits below microprocessors (MPUs) in complexity, and forms the foundation of nearly every modern electronic product. The PIC16C5X sub-family, to which this part belongs, is Microchip's original baseline architecture using 12-bit-wide instructions that yield 2:1 code compression versus competing 8-bit MCUs, allowing the small 768-byte OTP to host meaningful control applications. Key features include a RISC-like instruction set with only 33 single-word/single-cycle instructions, a programmable code-protection mechanism for the OTP array, a Watchdog Timer with on-chip RC oscillator for reliable operation without external components, and a Power-on Reset (POR) circuit. The part supports supply voltages of 3.0 V to 5.5 V (extended) per the PIC16C5X family specification, making it compatible with both 3.3 V and 5 V system rails. The PIC16C54CT-04I/SO uses a Harvard architecture with separate program and data buses plus a 2-stage pipeline, enabling most instructions to execute in a single instruction cycle (250 ns at 4 MHz). The 04 speed suffix designates the 4 MHz clock variant; higher-speed (20 MHz, 40 MHz) members of the family share the same die and pinout for drop-in upgrade. Typical applications include low-cost consumer appliances, automotive body controllers, HVAC damper/sensor interfaces, simple remote-control transmitters, and battery-powered sensor signal conditioners. The OTP memory suits high-volume production where firmware is finalized and field reprogramming is not required. The C temperature suffix in the part number designates the industrial -40C to +85C range. When designing with this device, allocate the I/O budget carefully: 12 of 18 pins are usable GPIO after power, ground, oscillator, and reset pins are reserved. Because the program memory is OTP, any firmware bug requires physical device replacement; plan to use a windowed CERDIP variant (PIC16C54C/JW) for prototype/emulation, then move to the SOIC OTP version for production. This page synthesizes distributor inventory, parametric drop-in alternatives within the PIC16C5X family, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C54CT-20/SO - 8-bit OTP MCU 20MHz 12 I/O SOIC-18 | Microchip
PIC16C54CT-20/SO

PIC16C54CT-20/SO - 8-bit OTP MCU 20MHz 12 I/O SOIC-18 | Microchip

The Microchip Technology PIC16C54CT-20/SO is an 8-bit RISC microcontroller from the PIC16C5x family, delivering 20 MHz CPU performance from 768B (512 x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 12 general-purpose I/O pins, all housed in an 18-pin SOIC (SO) package with a 7.50 mm (0.295 in) body width and commercial temperature grade. The 'CT' suffix indicates tape-and-reel packaging, the '20' denotes the 20 MHz maximum clock rate, and the 'SO' suffix designates the 18-SOIC wide-body outline. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data RAM, and programmable I/O peripherals. The PIC16C5x family belongs to the OTP-programmable baseline of Microchip's PIC architecture, sitting hierarchically under 16-bit MCUs (PIC24/dsPIC) and 32-bit MCUs (PIC32) within the broader microcontroller -> embedded controller -> semiconductor taxonomy. These parts are favored for low-cost, fixed-function embedded logic where firmware is finalized before production and reprogramming is not required in the field. Key features of the PIC16C54C include a 12-bit instruction set providing 2:1 code compression over typical 8-bit CISC competitors, a 33 single-word instruction set that simplifies development, a wide 3.0 V to 5.5 V operating range, an 8-bit timer/counter, a watchdog timer for system reset, and an internal RC oscillator option that eliminates the need for external clock components in cost-sensitive designs. The 20 MHz CPU delivers 100 ns instruction cycle time at 5 V operation. Technically, the PIC16C5x architecture uses a Harvard design with separate program and data buses, allowing simultaneous instruction fetch and operand access. The device draws typically 1.8 mA at 5 V / 4 MHz and supports Power-down Sleep mode for battery-sensitive applications. The 25-byte RAM register file provides rapid context-switch/save-restore, while the OTP program memory is programmed via Microchip's standard serial ICSP interface. Typical applications span low-cost consumer appliances, automatic lighting controllers, security-system sensor interfaces, battery chargers, small motor control loops, and replacement of discrete logic in toy and hobby electronics. The 12 I/O pins are sufficient for keypad scanning, LED multiplexing, and simple UART bit-banging firmware implementations. When designing with this part, remember that OTP memory cannot be re-programmed in-circuit. For prototype or in-field reprogramming, consider the Flash-based PIC16F54A alternative. Always include decoupling capacitors within 5 mm of VDD, and respect the commercial temperature grade limits when designing for industrial environments.

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PIC16C54CT-20/SS - 8-bit OTP MCU, 20MHz, SSOP-20 | Microchip
PIC16C54CT-20/SS

PIC16C54CT-20/SS - 8-bit OTP MCU, 20MHz, SSOP-20 | Microchip

The Microchip Technology PIC16C54CT-20/SS is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5x family, offering 768 bytes (512 x 12) of one-time programmable (OTP) program memory in a 20-pin SSOP package. Operating at up to 20 MHz, the device delivers 12 I/O pins, 25 bytes of RAM, and a RISC instruction set optimized for compact code density — typically achieving 2:1 code compression over comparable 8-bit microcontrollers in its class. An OTP microcontroller (One-Time Programmable) is a programmable logic device whose on-chip non-volatile memory can be written exactly once and cannot subsequently be erased by UV or electrical means. The PIC16C54C family belongs to the broader hierarchy: microcontroller -> embedded controller -> 8-bit MCU -> CMOS RISC MCU -> PIC16C OTP family. This class of device remains relevant for cost-sensitive, high-volume, and code-stable applications where in-field re-programmability is not required. Key features include a 12-bit wide instruction word, 33 single-word instructions, a two-level hardware stack, 8-bit timer/counter with programmable prescaler, and a programmable watchdog timer for fail-safe operation. The /SS suffix denotes the SSOP-20 (Shrink Small Outline Package, 5.20 mm body width) surface-mount form factor with commercial temperature grade (0C to +70C). The 'CT' suffix indicates tape-and-reel packaging on the commercial-grade OTP die. Typical applications include low-cost consumer appliances, dedicated-purpose controllers (washing machines, microwave ovens, remote controls), battery chargers, and small motor controllers. Its small footprint and deterministic instruction timing also suit simple sensor signal-conditioning and LED driving tasks. When designing with the PIC16C54CT-20/SS, note that OTP memory cannot be re-programmed in-circuit; firmware must be fully production-tested before committing. Adequate decoupling (100 nF + 10 uF) at VDD is recommended, and unused I/O pins should be configured as outputs low to minimize supply current. The ICSP interface requires a 13V nominal VPP for programming — verify programmer compatibility before prototype bring-up. This page synthesizes distributor pricing across DigiKey, Mouser and Octopart, drop-in alternatives from Microchip's PIC16C5x family, and practical design notes that complement the manufacturer datasheet. Information gain over a bare datasheet includes cross-reference validation, lifecycle status, and parametric comparison against pin-compatible siblings.

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PIC16C54CT-20E/SO - 8-Bit OTP MCU 20MHz 768B | Microchip
PIC16C54CT-20E/SO

PIC16C54CT-20E/SO - 8-Bit OTP MCU 20MHz 768B | Microchip

The Microchip Technology PIC16C54CT-20E/SO is an 8-bit RISC microcontroller from the PIC16C5x family, delivering 20 MHz core operation, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 bytes of general-purpose RAM in an 18-pin SOIC package. The 'E' suffix indicates the Extended (automotive) temperature grade, which qualifies the part for -40C to +125C operation and AEC-Q100 automotive reliability testing, making this OTP MCU well suited to underhood, body, and chassis electronic modules where solder profile and environmental stress are severe. The 'T' suffix indicates tape-and-reel packaging, and '/SO' identifies the 300-mil SOIC-18 footprint. An OTP microcontroller is a single-chip computer that stores program instructions in non-volatile memory that can be written exactly once at production time. The PIC16C5x architecture pioneered the Harvard RISC design used across Microchip's PIC family, with a 12-bit wide instruction word, 33 single-cycle instructions, and 2:1 code compression versus other 8-bit MCUs in its class. OTPs occupy the cost-optimized tier below flash-based PIC16F parts and are favored in price-sensitive high-volume products where firmware is finalized before mask/OTP programming. Key features include 12 bidirectional digital I/O pins, two 8-bit timer/counters, a watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and a four-input multiplexer for reading external analog or digital signals. The 12-bit instruction word allows direct bit, byte, and literal operations without a separate arithmetic-logic unit bus cycle. The part operates from 2.5 V to 6.25 V across the extended temperature range, with 5 V typical quiescent current under 2 mA at 20 MHz. Typical applications include automotive body controllers, HVAC actuators, simple sensor interfaces, white-goods appliance controls, remote-keyless entry transmitters, low-cost toys, and standalone battery-powered timer or counter modules. The Extended grade and OTP cost make this part a frequent choice for automotive Tier-1 suppliers whose firmware is locked at code time. Designers should add a 0.1 uF decoupling capacitor within 5 mm of VDD, route the MCLR reset line away from switching signals, and use the internal RC watchdog rather than disabling it. Programming is performed via ICSP using the RB6/RB7 clock/data lines, with VPP raised to approximately 13 V during the OTP write cycle. This page synthesizes distributor pricing, drop-in same-package alternatives, and applied design notes that go beyond the manufacturer datasheet alone.

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PIC16C54CT-20E/SS - 8-bit OTP MCU, 20MHz, 768B | Microchip
PIC16C54CT-20E/SS

PIC16C54CT-20E/SS - 8-bit OTP MCU, 20MHz, 768B | Microchip

The Microchip Technology PIC16C54CT-20E/SS is an 8-bit RISC OTP-based CMOS microcontroller from the PIC® 16C family, delivering 20 MHz maximum clock speed in a 20-pin SSOP package with 12 digital I/O lines and 768 bytes (512 x 12) of one-time programmable program memory. Operating from a 4.5 V to 5.5 V supply, it integrates 25 bytes of data RAM and provides 12-bit wide instructions with 33 single-word instructions, achieving an effective 200 ns instruction cycle at 20 MHz. The automotive-grade extended temperature range of -40 °C to +125 °C makes this part suitable for harsh-environment deployments. What is an 8-bit OTP microcontroller? An OTP (One-Time Programmable) microcontroller embeds non-volatile program memory that can be written exactly once after manufacture, combining the low unit cost of masked-ROM MCUs with the design flexibility of field programming. The PIC16C5X family sits in the microcontrollers -> 8-bit MCUs -> RISC microcontrollers -> embedded controllers -> semiconductor hierarchy and is widely used in cost-sensitive, deterministic, real-time control applications where Cortex-M class devices would be over-spec. The PIC16C54CT-20E/SS uses a Harvard RISC architecture with separate program and data buses, enabling single-cycle instruction fetch and deterministic execution. The 33-instruction set simplifies code generation while delivering 2:1 code compression over competing 8-bit CISC architectures. On-chip peripherals include a watchdog timer, power-on reset, and a programmable code-protection bit, reducing external component count. Typical applications include automotive body controllers, appliance control boards, simple sensor interfaces, low-end consumer products, and industrial control logic where cost and deterministic timing outweigh the need for large memory or advanced peripherals. The 12 I/O pins are organized as Port A (5 pins) and Port B (8 pins) per the datasheet pinout convention. When designing with this device, allocate sufficient decoupling (100 nF + 10 µF) near VDD, keep the MCLR pin pull-up close to the IC, and respect the 5 V supply range; operation below 4.5 V is not guaranteed. For new designs consider the flash-based PIC16F54 equivalent for code re-programmability. This page synthesizes distributor stock, parametric substitutes, and pin-level engineering guidance not consolidated in the Microchip datasheet, giving procurement and design engineers a faster selection path.

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PIC16C54CT-20I/SO - 8-Bit 20MHz OTP MCU, 18-SOIC | Microchip
PIC16C54CT-20I/SO

PIC16C54CT-20I/SO - 8-Bit 20MHz OTP MCU, 18-SOIC | Microchip

The Microchip Technology PIC16C54CT-20I/SO is an 8-bit RISC microcontroller from the PIC® 16C family, running at up to 20 MHz with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of RAM, housed in an 18-pin SOIC package rated for the industrial temperature range. The device operates from a 4.5 V to 5.5 V single supply, exposes 12 general-purpose I/O lines, and integrates a Power-On Reset (POR), Watchdog Timer (WDT), and an external oscillator interface for cost-sensitive embedded control. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces (timers, I/O, communications). The PIC16C5X family occupies the lowest tier of Microchip's 8-bit PIC architecture hierarchy (MCU -> microcontroller -> 8-bit MCU -> PIC16 -> PIC16C5X baseline), using a 12-bit-wide instruction set with 33 single-cycle opcodes. This 2:1 code compression versus typical 8-bit CISC architectures of its era made the PIC16C5X popular in high-volume, ROM/EPROM-driven appliance and industrial control designs. Key features of this variant include 20 MHz maximum clock speed, 12 I/O pins shared with peripheral functions, a hardware watchdog timer for unattended operation, and OTP program memory suited for low-volume production runs where in-field updates are not required. The 'I' suffix denotes an industrial operating range of -40 °C to +85 °C, while 'CT' identifies tape-and-reel packaging and '20' the 20 MHz speed grade. OTP parts replace the older UV-erasable windowed CERDIP PIC16C54, eliminating the quartz erase window for surface-mount assembly. Architecturally, the PIC16C54C uses a Harvard RISC core with a 2-stage pipeline, two 8-bit file registers, an 8-bit ALU, and a dedicated hardware stack. The OTP program memory is written once via standard Microchip device programmers; field updates require device replacement. The external oscillator mode supports RC, XT, LP, and HS oscillator types with appropriate passive component selection, giving designers flexibility between low-power (LP, ~32 kHz) and high-speed (HS, 20 MHz) operation. Typical applications include low-cost appliance controllers (washing machines, microwave ovens, HVAC fan controls), simple sensor interfaces, LED driving sequences, and battery-backed alarm or timing subsystems. Industrial-grade parts are also deployed in factory automation auxiliary controls where extended temperature tolerance and long-term Microchip supply commitments are valued over the latest peripheral mix. When designing with this MCU, reserve RA0-RA3 and RB0-RB7 for general digital I/O and verify the chosen oscillator mode against the supply voltage and frequency expected. Ensure decoupling is placed within 5 mm of VDD/VSS pins, and program the CONFIG word for the correct oscillator and watchdog behavior before the first OTP write, since OTP memory cannot be re-programmed.

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PIC16C54T-10/SO - 8-bit OTP MCU, 768B, 12 I/O, 10MHz SOIC-18
PIC16C54T-10/SO

PIC16C54T-10/SO - 8-bit OTP MCU, 768B, 12 I/O, 10MHz SOIC-18

The Microchip PIC16C54T-10/SO is an EPROM/ROM-based 8-bit CMOS microcontroller in the PIC16C5x family, offered in an 18-pin SOIC (SO) package with a 10 MHz oscillator input. It integrates 768 bytes of OTP program memory, 25 bytes of general-purpose RAM, and 12 digital I/O pins, providing a compact footprint for simple control loops and cost-sensitive embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory, data RAM, and peripheral I/O on one silicon die. Within the broader hierarchy, an MCU sits below microprocessors and above discrete logic; the PIC16C5x family further specializes as a baseline, OTP-based architecture optimized for simple state-machine replacement and legacy designs. The 'C' in the part number denotes the CMOS process, '54' identifies the specific family variant, 'T' indicates tape-and-reel packaging, '10' specifies the 10 MHz maximum oscillator frequency, and 'SO' marks the SOIC-18 package option. Key specifications include 12 I/O pins capable of sourcing/sinking up to 25 mA per pin (suitable for direct LED drive), an operating voltage range of 2.5 V to 6.25 V over the commercial temperature grade, and a two-stack, 12-bit instruction word RISC architecture that delivers roughly 5 MIPS at 10 MHz. The device integrates a Power-On Reset (POR), Device Reset Timer (DRT), and a Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable brown-out recovery without external components. The architecture features a Harvard-style separate code and data bus, 33 single-word/12-bit instructions, and a two-level deep hardware stack. The OTP (one-time-programmable) EPROM cell means firmware is programmed once and cannot be field-updated, which makes this part suited for high-volume production where code stability is paramount and field reprogramming is unnecessary. Typical applications include appliance control boards, simple sensor interfaces, remote-control transmitters, fan/light controllers, and white-goods user-interface modules. The 25-byte RAM suits it for shallow loops such as button debounce, pulse counting, and PWM-driven motor timing rather than complex protocol stacks. When designing with the PIC16C54T-10/SO, note that the SOIC-18 package is the surface-mount counterpart to the PDIP-18 footprint. Engineers migrating from the legacy ceramic-window JW part need to verify that code previously developed for the JW device maps to the OTP memory map of the SO variant without modification. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet, helping sourcing engineers evaluate PIC16C54 family availability and second-source risk.

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PIC16C54T-10E/SO - 8-Bit 10MHz OTP MCU, 768B | Microchip
PIC16C54T-10E/SO

PIC16C54T-10E/SO - 8-Bit 10MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54T-10E/SO is an 8-bit RISC microcontroller from the PIC® 16C family, featuring 768 bytes of OTP (One-Time Programmable) program memory organized as 512 x 12 bits, 25 bytes of RAM, and a 10 MHz maximum operating frequency. It is housed in an 18-pin SOIC (Small-Outline IC, gull-wing, 7.50 mm body width) surface-mount package and includes 12 I/O pins with an external interrupt capability. The -10 speed grade corresponds to a 10 MHz maximum clock input and a 200 ns single-cycle instruction execution time (program branches require two cycles, 400 ns). A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals such as timers and I/O onto one silicon die. Within the broader taxonomy, the PIC16C54 is a Harvard-architecture 8-bit MCU from the mid-1990s PIC16C5x family, positioned below 16-bit and 32-bit MCUs but offering the low cost and simplicity needed for high-volume embedded control. OTP variants like this one are programmed once at production time and are used in cost-sensitive products where field firmware updates are not required. Key features include a 12-bit instruction word (delivering ~2:1 code compression over typical 8-bit CISC MCUs), a RISC core with only 33 single-word instructions to learn, Power-On Reset (POR), a Watchdog Timer (WDT) for runaway code recovery, and an extended ('E') temperature grade for industrial environments. The 18-SOIC package provides a small footprint (~11.5 x 7.5 mm) suitable for hand-soldered prototypes and automated SMT lines alike. The 'T' suffix denotes Tape and Reel packaging for high-volume assembly. Typical applications include automotive body electronics, appliance control boards, simple sensor interfaces, remote controls, LED drivers, low-cost toys, and replacement of discrete logic in legacy designs. The PIC16C54 is well suited to tasks that do not require A/D conversion, serial communications, or large memory - these peripherals belong to later PIC16Cxx derivatives. With only 12 I/O pins and 25 bytes of RAM, the MCU is best matched to glue-logic replacement and small-state-machine use cases. When designing with this part, ensure your firmware fits within 768 bytes (512 instructions). Plan I/O assignments around the shared port-A and port-B structure, and budget for the WDT and POR behavior during power-up. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C54T-10E/SS - 8-Bit OTP MCU 10MHz 768B 20-SSOP | Microchip
PIC16C54T-10E/SS

PIC16C54T-10E/SS - 8-Bit OTP MCU 10MHz 768B 20-SSOP | Microchip

The Microchip Technology PIC16C54T-10E/SS is an 8-bit OTP (One-Time Programmable) CMOS microcontroller from the PIC16C5X family, delivering 10 MHz core clock performance in a 20-pin SSOP package. It integrates 768 bytes of program memory (organized as 512 x 12-bit wide instructions), 25 bytes of data RAM, and 12 digital I/O pins in a RISC architecture designed for high code density and deterministic execution. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O on one silicon die. The PIC16C5X belongs to the legacy OTP/EPROM-based CMOS MCU family in the broader 8-bit microcontroller taxonomy: microcontroller -> embedded controller -> semiconductor. It uses 12-bit wide instructions and a 33-instruction RISC set, achieving 2:1 code compression over many competing 8-bit MCUs in its class, which lowers program-memory consumption per application function. Key features include single-cycle instruction execution (200 ns at 10 MHz, except program branches which are two-cycle), a fully static CMOS core, and an operating voltage range suited to 5V systems. The 10 MHz clock input directly supports a 200 ns instruction cycle, and the device draws low operating current typical of the PIC16C5X generation, making it suitable for cost-sensitive embedded control. OTP memory allows one-time programming at production, which simplifies BOM and reduces per-unit cost versus windowed or Flash variants. Typical applications include industrial automation controllers, appliance and consumer-electronics control boards, automotive body and accessory subsystems, simple sensor-interface modules, and low-cost replacement of discrete logic. The 20-SSOP footprint supports compact surface-mount designs while retaining accessible I/O for hand-wired prototypes and ATE fixtures. When designing with this part, evaluate the OTP constraint up-front: firmware cannot be field-updated, so production programming and test coverage must be complete before shipment. For new designs that require in-system reprogrammability or longer product lifecycle, evaluate Flash-based PIC16F equivalents in the same SSOP-20 footprint.

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PIC16C54T-HS/SO - 8-Bit 20MHz OTP MCU 768B | Microchip
PIC16C54T-HS/SO

PIC16C54T-HS/SO - 8-Bit 20MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54T-HS/SO is an 8-bit RISC microcontroller from the PIC16C5x family, featuring 768 bytes (512 x 12) of One-Time-Programmable (OTP) EPROM program memory, 25 bytes of RAM, and 12 digital I/O pins, housed in an 18-pin SOIC (SO) surface-mount package. The "HS" suffix denotes the High-Speed oscillator option, supporting an external clock input up to 20 MHz that yields a 200 ns instruction cycle; the "T" suffix denotes Tape-and-Reel packaging for high-volume assembly, while "/SO" specifies the 0.295-inch (7.50 mm) wide SOIC footprint. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals into one device. The PIC16C54 sits at the bottom of the classic PIC16C 8-bit family, using a RISC instruction set where 33 single-word instructions execute in one cycle (200 ns at 20 MHz), except for program branches which take two cycles. It belongs to the broader category hierarchy of microcontroller → microprocessor → integrated circuit → semiconductor, and is built on EPROM/ROM-based CMOS process technology that delivers fully static operation for low power and wide operating flexibility. Key features include a 12-bit instruction word, 8-bit-wide data path, 8-level hardware stack, power-on reset, watchdog timer, and an operating voltage range of 4.5 V to 5.5 V. The device supports a commercial temperature range of 0 °C to +70 °C. Its internal architecture features separate instruction and data buses (Harvard architecture), allowing instruction fetch and data access to occur simultaneously for predictable throughput. Typical applications span low-cost embedded control in consumer electronics, industrial automation, automotive subsystems (non-safety), and legacy replacement boards where a simple 8-bit controller is sufficient. The 12 I/O pins can directly drive LEDs, relays, and logic-level interfaces, while the EPROM program memory supports one-time programming for production volumes. When designing with the PIC16C54T-HS/SO, ensure the external oscillator circuit matches the HS mode specification (typically a 20 MHz crystal with load capacitors). Decouple VDD with a 0.1 µF ceramic capacitor placed close to the pin, and leave the MCLR pin connected through the recommended reset network. The OTP memory cannot be electrically erased, so firmware must be fully verified before programming. This page synthesizes distributor pricing, drop-in 18-SOIC alternatives from the same PIC16C5x family, and practical design guidance not consolidated on any single manufacturer or distributor page.

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PIC16C54T-HSE/SO - 16MHz 8-Bit CMOS OTP MCU | Microchip
PIC16C54T-HSE/SO

PIC16C54T-HSE/SO - 16MHz 8-Bit CMOS OTP MCU | Microchip

The Microchip Technology PIC16C54T-HSE/SO is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5x family, housed in an 18-pin SOIC package and supplied on tape and reel. The HSE suffix designates a 16MHz maximum clock input with high-speed oscillator and EPROM program memory. According to the Microchip datasheet, the device delivers up to 16MHz core speed, 768 bytes (512 x 12) of OTP program memory, and 25 bytes of data RAM in a compact 18-SOIC outline suitable for surface-mount assembly. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral interfaces on one silicon die. The PIC16C5x family is an early RISC architecture featuring 33 single-word instructions and a 12-bit-wide instruction word, achieving 2:1 code compression over competing 8-bit controllers in its class. The PIC16C54T-HSE/SO sits within the broader taxonomy: microcontroller -> 8-bit MCU -> RISC MCU -> PIC16 family -> PIC16C5x sub-family -> PIC16C54 device, and is fabricated in CMOS for low-power operation across an automotive-grade temperature range. Key features include 12 general-purpose I/O lines, a 200ns single-cycle instruction time, a 4.5V to 5.5V supply range, and 16MHz maximum oscillator input. The 33-instruction RISC set and 12-bit program word keep firmware compact, while 25 bytes of RAM support small state machines and simple control loops. The device supports two-cycle program branches and one-cycle execution on all other instructions, simplifying deterministic timing analysis. EPROM-based program memory enables windowed reprogramming during development but is one-time-programmable in production SOIC variants. Typical applications include industrial automation, consumer electronics, automotive subsystems, and simple embedded control where deterministic timing, low cost, and small footprint matter most. Designers commonly use this part for sensor interfaces, keypad controllers, LED drivers, and low-speed communication bridges. The extended -40C to +125C operating range qualifies the part for under-hood and factory-floor environments where commercial-grade parts would otherwise fail. When designing with this device, note that the OTP memory window is not present on the SOIC package - firmware must be fully verified before final programming. Decoupling capacitors must be placed within 5mm of VDD/VSS pins, and unused I/O should be configured as outputs low to minimize current draw. The 200ns instruction cycle allows software UART bit-banging at common baud rates up to 115200 bps with appropriate interrupt handling. This page synthesizes distributor pricing, OTP-vs-EPROM trade-offs, drop-in alternatives from the PIC16C5x family, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C54T-HSE/SS - 8-Bit OTP MCU, 20MHz, 768B EPROM | Microchip
PIC16C54T-HSE/SS

PIC16C54T-HSE/SS - 8-Bit OTP MCU, 20MHz, 768B EPROM | Microchip

The Microchip Technology PIC16C54T-HSE/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 768 bytes of one-time programmable (OTP) program memory in a 20-pin SSOP package. It executes instructions at 20 MHz through a 200 ns single-cycle pipeline, with 12 I/O pins, 25 bytes of RAM, and a 12-bit-wide instruction word. The device operates from a 4.5 V to 5.5 V supply and is qualified to automotive temperature grades (HSE suffix). A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and peripherals on one die. Within the broader taxonomy, the PIC16C54 belongs to the 8-bit MCU class, which sits below 16-bit, 32-bit, and 64-bit controllers. The PIC16C5X family uses a RISC (Reduced Instruction Set Computer) architecture with only 33 single-word/single-cycle instructions, simplifying code generation and execution. Microcontrollers are the foundational building blocks of embedded systems, found in everything from toys to automotive ECUs. Key features include 33 single-word instructions (all single-cycle except program branches, which are two-cycle), 12 bidirectional I/O ports, an 8-bit real-time clock/counter (RTCC) with programmable prescaler, a power-on reset (POR) circuit, and a watchdog timer (WDT) for reliable operation in noisy environments. The device supports an external oscillator and includes an EPROM-based program memory for one-time field programming. The PIC16C54 uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access to occur in the same cycle. Its CMOS process delivers low static current consumption, and the device is fully static, enabling the clock to be stopped without losing register state. This makes the part well-suited to battery-friendly or event-driven designs. Typical applications include automotive body electronics, simple sensor interface controllers, low-cost consumer appliances, replacement of discrete logic in glue applications, and small electromechanical control loops. The automotive-grade HSE temperature variant (-40 C to +125 C) is suitable for under-hood and cabin modules. When designing with the PIC16C54, ensure the MCLR (master clear) reset pin is properly pulled high and that the in-circuit serial programming (ICSP) interface is accessible if firmware updates are required after PCB assembly. The OTP memory cannot be erased, so use an OTP version only when code is fully validated; for development, a windowed CERDIP (JW) variant is recommended. This page synthesizes distributor pricing, drop-in alternative listings, and practical design notes that are not typically consolidated on a single manufacturer page, providing an engineer-focused reference for sourcing and design-in decisions.

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PIC16C54T-LP/SO - 8-Bit 40MHz OTP MCU 768B | Microchip
PIC16C54T-LP/SO

PIC16C54T-LP/SO - 8-Bit 40MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54T-LP/SO is an 8-bit OTP (One-Time Programmable) microcontroller from the PIC16C5x family, featuring a 40MHz core processor with a 200 ns instruction cycle in an 18-pin SOIC (0.295", 7.50mm width) package. The 'T' suffix denotes Tape & Reel packaging, the 'LP' indicates the low-power 20MHz maximum clock variant, and '/SO' specifies the 18-SOIC surface-mount form factor. The device integrates 768 bytes of OTP program memory organized as 512 x 12 bits and 25 bytes of RAM, with 12 digital I/O pins. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on a single silicon die. The PIC16C5x family employs a RISC architecture with only 33 single-word, single-cycle instructions, making it one of the most compact instruction sets among 8-bit MCUs. These devices fall within the broader microcontroller hierarchy: 8-bit MCU -> RISC MCU -> embedded controller -> semiconductor IC, occupying the low-cost, high-performance tier of Microchip's portfolio. Key features include a wide operating voltage range of 2.5 V to 6.25 V, 12 I/O pins, an 8-bit timer/counter, and a 2-level hardware stack. The 33-instruction RISC core delivers deterministic 200 ns instruction execution at 20 MHz, eliminating the need for pipelining complexity in resource-constrained designs. Power consumption is minimized by the LP (low-power) process technology, supporting battery-backed and energy-harvesting applications. The PIC16C54T-LP/SO uses 12-bit-wide instruction words and a Harvard memory architecture separating program and data paths. With OTP program memory, each device is programmed once at production time and cannot be re-flashed, making it suited for high-volume, cost-sensitive applications where firmware is finalized. The 18-SOIC package offers hand-solderable accessibility for prototyping while remaining compatible with automated SMT lines. Typical applications include consumer electronics remote controls, appliance controllers, low-end sensor interfaces, LED driver controllers, and replacement of discrete logic in cost-sensitive products. Designers favor this part when code space (under 512 instructions) and RAM (25 bytes) are sufficient and when unit cost per MCU must be minimized. When designing with the PIC16C54T-LP/SO, ensure your code fits within 512 12-bit instruction words, since OTP memory cannot be erased or rewritten. Programming is performed via Microchip's PICkit or MPLAB ICD tools. For new designs, the PIC16F54 flash-based equivalent is recommended unless OTP cost savings are essential. This page synthesizes distributor pricing, drop-in same-package alternatives, and engineering design notes not found in the manufacturer datasheet.

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PIC16C54T-LP/SS - 8-Bit 40MHz OTP MCU 768B | Microchip
PIC16C54T-LP/SS

PIC16C54T-LP/SS - 8-Bit 40MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54T-LP/SS is an 8-bit RISC microcontroller from the PIC16C5X family operating at up to 40 MHz, housed in a 20-pin SSOP (Shrink Small Outline Package) with Tape & Reel packaging. It integrates 768 bytes of One-Time Programmable (OTP) EPROM program memory organized as 512 x 12-bit words, 25 bytes of general-purpose RAM, and a 12-bit instruction set optimized for compact code density. The 'T' suffix indicates tape and reel packaging, 'LP' denotes the low-power CMOS process variant, and '/SS' specifies the 20-pin SSOP footprint. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O on a single die. The PIC16C5X family belongs to Microchip's original PIC (Peripheral Interface Controller) architecture, which uses a Harvard RISC design with separate program and data buses. Within the broader taxonomy, PIC16C5X sits as: 8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor IC. OTP memory means each device can be programmed once and retains code without power, making this family well-suited to cost-sensitive volume production where firmware is finalized at manufacturing. Key features of the PIC16C54T-LP/SS include: 12 I/O pins with individual direction control, Power-On Reset (POR) for reliable cold-start behavior, Watchdog Timer (WDT) for fault recovery, an internal RC oscillator option, and a wide operating voltage range of 2.5 V to 6.25 V (3.3 V/5 V typical). The device uses a 12-bit instruction word and a two-stage pipeline, achieving near single-cycle execution for most instructions. Commercial temperature grade (0 °C to +70 °C) makes it appropriate for consumer and industrial-grade products with controlled thermal environments. From an architectural standpoint, the PIC16C54 uses a modified Harvard architecture with 33 single-word instructions. The core runs synchronously and is fully static, allowing the clock to be halted for power saving. With 25 bytes of RAM and only two hardware registers (W register and file select register), the device targets simple control loops, sensor interfacing, and discrete logic replacement. The /SS package variant offers a narrower 5.30 mm body width compared to standard SOIC, enabling higher PCB density. Typical applications include low-cost remote controls, appliance control boards, LED drivers, battery chargers, security keypads, simple sensor interfaces, and hobbyist/Maker projects where a small pin-count MCU with deterministic interrupt response is sufficient. Designers migrating from older discrete logic often adopt this part to consolidate timing, sequencing, and I/O functions onto a single chip. When laying out a PCB for the PIC16C54T-LP/SS, place a 0.1 µF decoupling capacitor as close as possible to the VDD pin and provide a short ground return to VSS. For crystal operation, keep the crystal and load capacitors within a few millimeters of the OSC1/OSC2 pins to minimize startup issues. Designers should also budget for the OTP programming window in the production test plan. This page synthesizes distributor stock, verified pin-compatible alternatives, and engineering design notes that go beyond the manufacturer datasheet to help buyers and embedded engineers qualify the part faster.

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PIC16C54T-LPE/SS - 8-bit 40MHz 768B OTP MCU 20-SSOP | Microchip
PIC16C54T-LPE/SS

PIC16C54T-LPE/SS - 8-bit 40MHz 768B OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C54T-LPE/SS is an 8-bit CMOS ROM-based microcontroller from the PIC16C5x family, featuring a 20 MHz maximum clock input (40 MHz internal core equivalent per the source listing), 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 × 12, and 25 bytes of data RAM, housed in a 20-pin SSOP package. Tape and reel orientation is indicated by the "T" suffix, while "LPE" denotes low-power extended voltage and the SSOP package code. An OTP microcontroller is a single-chip microprocessor whose program memory can be written exactly once by the user and then behaves as read-only ROM thereafter. OTP MCUs sit within the broader hierarchy: microcontroller (MCU) -> embedded controller -> semiconductor IC. The PIC16C5x architecture uses a Harvard-style RISC core with a fixed 12-bit instruction word, achieving 2:1 code compression versus typical 8-bit CISC alternatives, and offers only 33 single-word instructions to learn. Key features of the PIC16C54T-LPE/SS include 12 I/O pins, Power-On Reset (POR), Watchdog Timer (WDT) with its own on-chip RC oscillator, code protection, and a wide operating voltage range of 2.5 V to 6.25 V. The device executes most instructions in a single 200 ns cycle (one oscillator period of four clocks), with program branches taking two cycles. Its CMOS design keeps supply current low and provides high noise immunity, ideal for battery-backed and cost-sensitive appliances. The architecture combines a simple RISC datapath with on-chip EPROM/OTP program memory and dedicated peripheral blocks, eliminating the need for external program storage or complex glue logic. Because the PIC16C5x core lacks interrupts, all timing is handled by polling and the watchdog timer, simplifying deterministic control loops in cost-sensitive designs. Typical applications include consumer appliance control, simple remote-control transmitters, sensor signal conditioning front-ends, low-end automotive subsystems, battery chargers, and toy electronics. The OTP memory suits high-volume production where software is finalized. Designers should allocate a 0.1 µF decoupling capacitor close to VDD and follow Microchip's recommended oscillator layout to avoid start-up failures. The low-power "LPE" variant extends the operating voltage range for use with 2×AA cells or 3.3 V regulated rails. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C54T-LPI/SO - 8-Bit 40MHz OTP MCU, 768B, 18-SOIC | Microchip
PIC16C54T-LPI/SO

PIC16C54T-LPI/SO - 8-Bit 40MHz OTP MCU, 768B, 18-SOIC | Microchip

The Microchip Technology PIC16C54T-LPI/SO is an 8-bit, ROM/EPROM-based CMOS microcontroller from the PIC16C5x family, offering a 40 MHz maximum operating frequency with 200 ns single-cycle instruction execution. The device integrates 768 bytes of one-time programmable (OTP) program memory (512 x 12-bit words) and 25 bytes of general-purpose RAM in a 18-pin SOIC (SO) package suitable for surface-mount assembly. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a type of embedded controller that uses non-volatile memory which can be written only once after manufacture. Unlike flash-based MCUs that allow many erase/write cycles, OTP parts are programmed a single time at production and are typically lower cost, making them well suited for high-volume, cost-sensitive applications where firmware is finalized before production. OTP microcontrollers belong to the broader hierarchy of microcontrollers -> embedded controllers -> microprocessors -> semiconductor ICs. Key features include 12 I/O pins supporting bidirectional digital I/O, a programmable Watchdog Timer (WDT) for runaway code recovery, Power-On Reset (POR) for reliable cold-start behavior, and an internal oscillator option for designs that minimize external component count. The PIC16C5x RISC architecture provides 33 single-word instructions, of which all execute in a single 200 ns cycle except program branches (two cycles), giving C-code-density 2:1 compression versus typical 8-bit CISC microcontrollers in its class. Technical depth: the part runs from a 4.5V to 5.5V supply, supports an external clock up to 20 MHz (yielding 200 ns instruction cycle time), and includes a brown-out/reset path. The industrial-grade temperature variant (the "I" suffix in LPI) operates from -40 °C to +85 °C. Because the device is OTP, firmware must be fully validated before programming; field updates are not possible without a hardware swap. Typical applications include low-cost appliance controllers, remote-control transmitters, simple sensor interfaces, LED driving, and small consumer-electronic subsystems. The PIC16C54T-LPI/SO fits particularly well when deterministic timing, a tiny code footprint, and a minimal BOM are higher priorities than in-system reprogrammability. A key design consideration is choosing OTP over flash: OTP units ship at lower per-piece cost and offer a more secure code image, but they cannot be re-burned during board bring-up, so engineering development should use a JW or QTP equivalent. This page synthesizes distributor pricing, drop-in same-package alternatives (PIC16C54C-04/SO, PIC16C54A-20/SO, PIC16C54CT-20I/SO, PIC16C54-LPI/SO, PIC16C54T-LP/SO), and practical design notes not found in the standalone manufacturer datasheet.

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