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PIC16C554T-20I/SO - 8-Bit 20MHz OTP MCU, 896B, 18-SOIC | Microchip
PIC16C554T-20I/SO

PIC16C554T-20I/SO - 8-Bit 20MHz OTP MCU, 896B, 18-SOIC | Microchip

The Microchip Technology PIC16C554T-20I/SO is an 8-bit PIC microcontroller in the PIC16C5x baseline family, featuring a 20 MHz CPU core, 896 bytes of One-Time Programmable (OTP) program memory organized as 512 words of 14 bits, and 80 bytes of data RAM. It is housed in an 18-pin SOIC (Small Outline Integrated Circuit) package with 7.50 mm body width and is rated for the industrial temperature range of -40C to +85C. The -20 speed suffix indicates a 20 MHz maximum oscillator frequency, while the I-suffix designates industrial-grade operation and the T-suffix marks Tape & Reel packaging. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller contains non-volatile program memory that can be written exactly once by the user, typically using a device programmer before PCB mounting. OTP MCUs sit between Mask ROM devices (cheapest at very high volumes but require factory programming) and Flash-based MCUs (re-programmable in-circuit). For low-to-medium volume production, OTP parts offer lower per-unit cost than Flash parts without the tooling NRE of Mask ROM. Key features include a RISC instruction set with only 33 single-word instructions, two 8-bit I/O ports (RA and RC), one 8-bit timer (TMR0), a watchdog timer with its own on-chip RC oscillator, power-on reset, brown-out detection, and an operating voltage range from 2.5 V to 5.5 V. The PIC16C5x baseline core has no hardware interrupt controller and uses a polled software architecture. The device uses a Harvard architecture with separate program and data buses, executing one instruction per instruction cycle (4 oscillator clocks) for a 200 ns instruction time at 20 MHz. This deterministic single-cycle execution makes the PIC16C554 well-suited for real-time control loops where precise timing matters. The baseline core has a 2-level deep hardware stack and no software stack pointer. Typical applications include appliance control, sensor signal conditioning, LED lighting controllers, simple motor control, remote controls, battery-powered instruments, and automotive body electronics (non-safety). The industrial temperature range and small 18-SOIC footprint suit dense control boards. When designing with this part, note that OTP memory means firmware must be fully verified before programming. Allow for a programming connector footprint (ICSP) on the PCB if in-system verification is required during pilot runs. Always place a 0.1 uF decoupling capacitor within 5 mm of the VDD pin.

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PIC16C554T-20I/SS - 8-Bit OTP MCU, 20MHz, 20-SSOP | Microchip
PIC16C554T-20I/SS

PIC16C554T-20I/SS - 8-Bit OTP MCU, 20MHz, 20-SSOP | Microchip

The Microchip Technology PIC16C554T-20I/SS is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC16C family, delivering up to 20 MHz operation with 200 ns instruction execution in a 20-pin SSOP package. It integrates 896 bytes of OTP program memory (512 x 14 words) and 80 bytes of data RAM, with 13 programmable I/O pins and an operating voltage range of 3.0 V to 5.5 V. The device supports the industrial -40C to +85C temperature range and ships in tape-and-reel packaging as indicated by the 'T' suffix. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die. The PIC architecture pioneered the Harvard RISC design for embedded controllers, executing one instruction per clock cycle (except branches) and offering deterministic interrupt response. Within the system hierarchy, a PIC16C-series MCU belongs to the broader category of microcontroller -> embedded processor -> integrated circuit -> semiconductor. The 16C family specifically uses OTP EPROM rather than flash, making it suited for high-volume mature programs where code stability and low unit cost outweigh in-field reprogrammability. Key features include 35 single-word instructions, a 14-bit instruction word, two 8-bit timer/counters (Timer0 and Timer2), a Watchdog Timer (WDT) with on-chip RC oscillator, Power-On Reset (POR), and a programmable code-protection mechanism. The device consumes very low operating current, supporting battery-powered and energy-conscious designs. Its SSOP-20 footprint (5.30 mm body width) is widely accepted for industrial embedded boards. Architecturally, the PIC16C554 uses a RISC engine with separate program and data buses, eliminating Von Neumann fetch bottlenecks. The OTP cell array is programmed via standard Microchip device programmers (e.g., MPLAB PM3). Code protection bits and ID locations are supported. This 8-bit core is fully supported by MPLAB X IDE and the XC8 C compiler, with a mature library ecosystem covering timers, ADC emulation via RC, and bit-banged peripherals. Typical applications include industrial control logic, sensor interface modules, low-cost consumer appliances, white-goods user-interface boards, automotive body electronics sub-modules, and battery-operated instrumentation. Designers choose this OTP part for stable production firmware where field re-programming is unnecessary, reducing per-unit cost versus equivalent flash devices. Design consideration: Because the PIC16C554T-20I/SS is OTP (not flash), the firmware must be fully validated on a windowed or flash-equivalent PIC16F554 prototype before committing to OTP volume production. Also plan for in-circuit programming (ICSP) test points since OTP parts cannot be re-programmed during PCB debug. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet with cross-references, parametric comparisons, and engineered replacement guidance.

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PIC16C558-04/P - 8-bit 4MHz OTP MCU, 3.5KB, 18-PDIP | Microchip
PIC16C558-04/P

PIC16C558-04/P - 8-bit 4MHz OTP MCU, 3.5KB, 18-PDIP | Microchip

The Microchip Technology PIC16C558-04/P is a member of the PIC16C55x family of 8-bit CMOS microcontrollers, packaged in an 18-pin PDIP and offering 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 digital I/O pins. The device is built on Microchip's Harvard RISC architecture, executing 35 single-word instructions at a 200 ns instruction cycle when running at 4 MHz. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, memory, and peripherals on a single die. 8-bit MCUs sit at the base of the embedded computing hierarchy: MCU -> microcontroller -> embedded processor -> semiconductor. Within the Microchip taxonomy, the PIC16C5x family is the cost-optimized, OTP-based predecessor to the flash-based PIC16F5x/PIC16Fxxx lines, suited to high-volume, fixed-code applications. Key specifications of the PIC16C558-04/P include a 4 MHz maximum oscillator frequency, 13 GPIO pins arranged across ports RA and RB, an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a wide 3.0 V to 5.5 V operating range, and low-power CMOS construction. The /04 speed suffix indicates the 4 MHz oscillator grade; /20 (20 MHz) variants are also produced. The /P suffix denotes the through-hole PDIP-18 package on a 0.300 inch (7.62 mm) row spacing. The PIC16C558 uses a 14-bit instruction word with an 8-bit data path. Its RISC CPU keeps the instruction set to 35 single-word opcodes, reducing code density overhead and easing assembly development. Internal peripherals include a watchdog timer, power-on reset, brown-out reset, and an 8-bit prescaler shared between TMR0 and the watchdog. Typical applications include appliance control, automotive body electronics, sensor interface nodes, simple motor control, industrial monitoring, and low-cost consumer products. The 18-pin count targets mid-sized embedded designs that need more I/O than 14-pin PICs but do not require the larger 20- or 28-pin PIC16C55x siblings. When designing with the PIC16C558-04/P, note that the OTP program memory cannot be re-programmed in-circuit - firmware must be committed at production time. For prototyping or field-upgradable applications, consider the PIC16F558 or PIC16F57 (flash-based equivalents in the same 18-pin PDIP). An external RC or crystal oscillator between OSC1/OSC2 sets the system clock; a 4 MHz crystal is typical for the /04 grade. This page synthesizes distributor pricing from Mouser and DigiKey, drop-in and cross-package alternatives drawn from Microchip's compatibility charts, and design notes grounded in the PIC16C55x datasheet - information not consolidated on any single manufacturer or distributor page.

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PIC16C558-04E/P - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
PIC16C558-04E/P

PIC16C558-04E/P - 8-Bit 4MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C558-04E/P is an EPROM/OTP-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4 MHz (200 ns instruction cycle) performance with 3.5 KB (2K x 14) of program memory and 128 bytes of RAM in a through-hole 18-pin PDIP package. The device exposes 13 digital I/O pins and integrates a 35-instruction RISC core designed for deterministic, single-cycle execution across most instructions. The "E" suffix denotes the extended industrial temperature grade (-40C to +125C), while "04" indicates the 4 MHz maximum clock, and "/P" identifies the PDIP-18 package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory (RAM), and configurable I/O peripherals on a single die. PIC microcontrollers belong to the RISC (Reduced Instruction Set Computer) family, characterized by a small, fixed-length instruction set optimized for low power consumption and predictable timing - making them suitable for embedded control applications ranging from appliance controllers to automotive subsystems. The PIC16C5x series is the OTP (One-Time Programmable) variant, intended for production volumes where reprogrammability is not required. Key features of the PIC16C558-04E/P include a 200 ns instruction execution time, hardware timer/counter peripherals, a watchdog timer for system reliability, power-on reset, brown-out detection, and an operating voltage range of 3.0 V to 5.5 V. The device supports in-circuit serial programming (ICSP) via its RB6/RB7 pins, allowing field updates and factory calibration. The CMOS process delivers low power consumption, typically a few mA active and microamp-level standby current, enabling battery-friendly designs. The PIC16C558 utilizes a Harvard architecture with separate program and data buses, allowing instruction fetch and operand read to occur in the same cycle - one reason for its fast instruction throughput. The 12-bit program word width provides compact code density for C and assembly, while the 8-bit data path simplifies arithmetic and bit-manipulation operations common in embedded control loops. The integrated RC oscillator or external crystal options cover the majority of timing needs without external components. Typical applications for the PIC16C558-04E/P include industrial control logic, sensor interfacing, appliance control boards, automotive body electronics (pre-CAN nodes), simple sensor hubs, remote controls, and replacement of discrete logic gates. Its 13 I/O pins make it well suited to small-signal multiplexing tasks and timing-critical control loops. When designing with this part, note that OTP memory is one-time programmable - any firmware revision requires a new device. For prototyping or production with code revisions, the Flash-based PIC16F558 equivalent is recommended. The extended-temperature grade ("E") supports -40C to +125C operation, making this part suitable for harsh-environment industrial and automotive under-hood applications. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet or distributor product pages.

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PIC16C558-04I/P - 4MHz 8-Bit OTP MCU 13 I/O 18-PDIP | Microchip
PIC16C558-04I/P

PIC16C558-04I/P - 4MHz 8-Bit OTP MCU 13 I/O 18-PDIP | Microchip

The Microchip PIC16C558-04I/P is an 8-bit CMOS OTP-based PIC microcontroller executing instructions in 200 ns with only 35 single-word instructions, housed in an 18-pin PDIP through-hole package. According to the Microchip PIC16C558 datasheet (40143E), the device integrates 3.5KB (2K x 14) of OTP program memory, 128 bytes of data RAM, 13 digital I/O pins, and an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, all running from a 2.5V to 5.5V supply. A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory (ROM/OTP/Flash), working RAM, and programmable peripherals. PIC microcontrollers use a Harvard RISC architecture with separate program and data buses, enabling deterministic instruction timing critical for real-time control. The PIC16C55x family targets low-cost embedded control and belongs to the broader category: microcontroller -> embedded processor -> semiconductor IC. Key features of the PIC16C558-04I/P include its 4 MHz maximum operating frequency (the -04 speed grade), 13 I/O pins across PORTA (5 bits) and PORTB (8 bits), a 2-level hardware stack, direct/indirect/relative addressing modes, and 8-bit real-time clock/counter TMR0 with software-programmable prescaler. The OTP (One-Time Programmable) program memory enables low per-unit cost in production volumes. The architecture uses a 12-bit wide instruction word with an 8-bit data path, maximizing code density. Seven special-function hardware registers plus two file-select registers govern I/O and control. The device supports in-circuit serial programming (ICSP) via RB6/RB7, enabling firmware update after PCB assembly. The "I" industrial temperature suffix extends operation to -40C to +85C. Typical applications include automotive body controllers, industrial sensor interfaces, appliance control boards, security system keypads, and low-end consumer electronics. The wide 2.5V-5.5V range supports both 3.3V and 5V system designs with a single BOM. When designing with this device, ensure MCLR is tied high through a 10 kohm pull-up for normal operation; tie low only for reset. Place a 0.1 uF decoupling capacitor on VDD within 5 mm of the pin, with a bulk 1-10 uF cap on the same rail. Watchdog timer and power-on reset defaults must be configured in software at startup. This page synthesizes current distributor pricing, drop-in PIC16C55x alternatives from Microchip's parametric family, and practical through-hole PCB layout notes not consolidated in the manufacturer datasheet.

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PIC16C558-04I/SO - 8-bit OTP MCU, 4MHz, 3.5KB | Microchip
PIC16C558-04I/SO

PIC16C558-04I/SO - 8-bit OTP MCU, 4MHz, 3.5KB | Microchip

The Microchip Technology PIC16C558-04I/SO is an 8-bit CMOS OTP-based RISC microcontroller in an 18-pin SOIC package, executing one instruction every 200 ns at a 4 MHz oscillator rate. It integrates 3.5 KB of program memory (2K x 14 words), 128 bytes of RAM, and a 7+1 hardware register file within the classic PIC16 mid-range core. Industrial temperature grade (-40C to +85C) supports deployment in uncontrolled environments. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (here, one-time-programmable EPROM/OTP), and peripherals on one die. PIC16C5xx MCUs sit inside the hierarchy: PIC16C5xx -> PIC16 family -> PIC16C OTP series -> 8-bit microcontroller -> RISC processor -> embedded computing IC. The 35 single-word instruction set, two-level hardware stack, and direct/indirect/relative addressing modes make the PIC16C558 an easy-to-learn platform for engineers building simple control loops. Key features include seven or eight Special Function Registers (SFRs), an 8-bit Timer0 with a programmable prescaler, a watchdog timer for fault recovery, and a power-on reset (POR) block. The brown-out reset (BOR) and power-saving SLEEP mode reduce quiescent current for battery-powered nodes. CMOS process technology delivers low power consumption typical of the PIC16C family. The PIC16C558 uses a Harvard architecture with separate program and data buses, a 12-bit wide instruction word, and an 8-bit wide data path. Two I/O ports (PORTA 5 pins, PORTB 8 pins) provide up to 13 digital I/O lines, and the device operates from 3.0 V to 5.5 V. This combination suits applications needing modest compute and GPIO with deterministic instruction timing rather than high throughput. Typical applications include appliance controllers, sensor signal conditioning front-ends, automotive body electronics sub-modules, industrial timer/relay controllers, and remote sensor transmitter nodes. Designers value the part for low cost and predictable interrupt latency when migrating from earlier PIC16C5x designs. When designing with this OTP MCU, remember the program memory cannot be erased electrically; use the PIC16F558 flash variant during prototyping. Place decoupling capacitors as close as possible to VDD/VSS, and respect the 4 MHz maximum oscillator rating with margins for temperature drift. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C558-20/P - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
PIC16C558-20/P

PIC16C558-20/P - 8-Bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C558-20/P is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5x family, operating at up to 20MHz with 200ns instruction execution, integrating 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 general-purpose I/O pins in an 18-pin PDIP through-hole package. As a member of Microchip's foundational mid-range PIC architecture, it executes 35 single-word instructions and features a two-level hardware stack, direct/indirect/relative addressing modes, an 8-bit Timer0, a watchdog timer, and seven or eight special function hardware registers. The 12-bit wide instruction word paired with an 8-bit data path delivers deterministic RISC performance suited to cost-sensitive embedded control. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals, and timers on one die. Within the IC taxonomy, an 8-bit MCU sits under: microcontroller -> microprocessor -> integrated circuit -> semiconductor. The PIC16C5x family specifically targets simple control loops, sensor interfaces, and human-machine-input (HMI) tasks where 8-bit performance, low pin count, and OTP/EPROM-based code storage are sufficient. OTP memory allows the device to be programmed once during manufacturing or development, making the PIC16C558 ideal for low- to mid-volume production runs that do not require the field-reprogrammability of Flash-based PIC16F parts. Key features include a 20MHz maximum oscillator frequency, an operating voltage range of 2.5V to 6.0V (commercial), low-power CMOS design, an 8-bit real-time clock/counter (TMR0), power-on reset, watchdog timer with its own on-chip RC oscillator for reliable operation, and a programmable code-protection mechanism. The 18-pin PDIP package provides easy through-hole prototyping on breadboards and standard 0.1-inch-pitch perfboards, while the wide 2.5-6.0V supply range supports both 3.3V and 5V system rails. Compared with the PIC16C554, the PIC16C558 doubles the RAM to 128 bytes while retaining the same 13 I/O and core 8-bit architecture. Typical applications include consumer appliance control, automotive body electronics (non-safety), industrial sensor interfaces, LED display drivers, IR remote control transmitters, low-end motor control, battery chargers, and simple HMI panels. Its 35-instruction RISC core enables rapid development in assembly or C, and the watchdog timer makes it well suited to unattended remote nodes that must recover from firmware or environmental faults. Engineers choose the PIC16C558 when they need a proven, mature 8-bit core with OTP memory in a hobbyist-friendly DIP footprint. When designing with this device, note that OTP memory cannot be erased, so firmware must be fully debugged on a Flash equivalent (such as the PIC16F558) before committing to a PIC16C558 production build. Always allocate a watchdog timer timeout appropriate to the main loop period, and place a 0.1uF decoupling capacitor as close as possible to the VDD pin. The 18-pin PDIP is being phased out for many new designs in favor of smaller SOIC and SSOP footprints, so consider long-term availability and the availability of Flash siblings (PIC16F558) for ongoing development. This page synthesizes distributor pricing, drop-in Microchip replacements, and practical design notes not found in the manufacturer datasheet alone. Engineers evaluating the PIC16C558-20/P for new designs or sustaining legacy systems will find verified parametric data, cross-reference alternatives, and PCB layout guidance tailored to OTP-based PIC16C5x designs.

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PIC16C558-20/SO - 8-Bit 20MHz 3.5KB OTP MCU 18-SOIC | Microchip
PIC16C558-20/SO

PIC16C558-20/SO - 8-Bit 20MHz 3.5KB OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16C558-20/SO is an 8-bit PIC RISC microcontroller with 3.5KB (2K x 14) One-Time-Programmable (OTP) program memory, 128 bytes of RAM, 13 I/O pins, and a 20MHz maximum clock speed, housed in an 18-pin SOIC (SO) package. It executes instructions in 200 nanoseconds with only 35 single-word instructions, simplifying firmware development for cost-sensitive embedded designs. Operating from 3.0V to 5.5V, the PIC16C558 is built on CMOS technology and is well-suited to automotive, industrial, and consumer applications. An 8-bit OTP microcontroller is a small single-chip computer built around an 8-bit data path with non-volatile program memory that can be written exactly once (One-Time-Programmable), commonly used in low-cost, high-volume products. PIC microcontrollers belong to the broader family of microcontrollers -> embedded processors -> semiconductors, and the PIC16C series specifically targets mid-range applications requiring moderate I/O count (13-33 pins), modest memory (a few KB), and deterministic real-time response. Key features of the PIC16C558-20/SO include a Harvard architecture with separate program and data buses, 8-level hardware stack, integrated power-on reset, brown-out reset, watchdog timer, and an 8-bit timer/counter. The 18-pin SOIC package provides 13 digital I/O pins, each capable of sinking/sourceing up to 25 mA, plus dedicated oscillator and reset pins. The CMOS process yields low power consumption suitable for battery-operated or line-powered industrial equipment. The PIC16C558 uses a RISC instruction set where all 35 instructions are single-word (14-bit) and execute in a single instruction cycle (4 clock periods), giving 5 MIPS throughput at 20MHz. The OTP program memory allows code to be written during manufacturing test, ideal for mature products. The architecture's deterministic interrupt response and hardware stack simplify real-time control loops common in appliance, sensor, and motor-driver subsystems. Typical applications include automotive body controllers, industrial sensor interfaces, consumer white goods, security keypads, low-end motor control, LED driver controllers, and battery chargers. The wide operating voltage (3.0V-5.5V) makes it compatible with both 3.3V and 5V system rails commonly found in legacy industrial designs. The 18-pin SOIC package also supports through-hole PCB reflow assembly. When designing with the PIC16C558-20/SO, select the appropriate oscillator mode (XT, HS, LP, or RC) based on system clock requirements and EMI constraints. Note that OTP memory cannot be reprogrammed, so engineering samples should use windowed (JW) or Flash (PIC16F) variants during development. This page synthesizes distributor pricing, pin-compatible PIC16C5x drop-in alternatives, and practical design notes not aggregated on the manufacturer datasheet or individual distributor pages.

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PIC16C558-20/SS - 3.5KB OTP 8-bit MCU, 20 SSOP | Microchip
PIC16C558-20/SS

PIC16C558-20/SS - 3.5KB OTP 8-bit MCU, 20 SSOP | Microchip

The Microchip Technology PIC16C558-20/SS is an EPROM-based 8-bit CMOS microcontroller in a 20-pin SSOP (SS) package, delivering 200 ns instruction execution across 35 single-word instructions in the PIC mid-range architecture. The device integrates 3.5 KB of OTP program memory, 128 bytes of RAM, and 13 digital I/O pins, with a 20 MHz maximum operating frequency that yields a 200 ns instruction cycle. It is offered in the -20 speed grade operating from 3.0 V to 5.5 V across the commercial 0 °C to +70 °C temperature range. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and peripheral interfaces. The PIC16C558 belongs to the PIC16C5X family of OTP (one-time-programmable) baseline-to-mid-range controllers, sitting in the system hierarchy as follows: PIC16C5X → PIC16C family → 8-bit PIC microcontroller → embedded MCU → semiconductor. The OTP memory is factory- or field-programmed once using a device programmer and cannot be erased, making the PIC16C558 suited to high-volume fixed-code applications rather than firmware development. Key features include 13 bidirectional I/O pins with individual direction control, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a watchdog timer with on-chip RC oscillator for reliable system recovery, and power-saving SLEEP mode. The device also integrates a 4 MHz internal RC oscillator option (selected at programming time), a programmable code-protection scheme, and an in-circuit serial programming (ICSP) interface that allows programming after PCB assembly. The PIC16C558 uses a RISC Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur in parallel. The 8-bit ALU, 8-bit working register (W), 11-bit program counter, and 2-level deep hardware stack provide deterministic execution suitable for interrupt-free control loops. The 20 MHz clock with 4-clock-per-instruction cycle produces the headline 200 ns instruction time referenced in the device family literature. Typical applications include appliance controls, automotive body electronics (with the -I and -E temperature variants), industrial sensor interfaces, LED drivers, and low-cost remote-control transmitters. The wide 3.0-5.5 V supply range supports both 3.3 V and 5 V system designs. Engineers designing with the PIC16C558 should plan for OTP programming early in the design cycle, since the device cannot be re-programmed in-circuit beyond the initial ICSP write; for iterative development a FLASH-based PIC16F equivalent is recommended, but only certain speed-grade and pinout variants qualify as true drop-in parts. This page synthesizes distributor pricing, drop-in same-package alternatives drawn from the verified cross-reference data, and practical design notes not aggregated on any single manufacturer or distributor page.

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PIC16C558-20E/P - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
PIC16C558-20E/P

PIC16C558-20E/P - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C558-20E/P is an 8-bit CMOS OTP (One-Time Programmable) RISC microcontroller in an 18-pin PDIP (through-hole) package, executing instructions at 20MHz with a 200ns instruction cycle. It integrates 3.5KB (2K x 14) of OTP program memory and 128 bytes of RAM, making it a cost-effective solution for high-volume embedded control. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (here OTP), and peripherals. It sits at the base of the embedded hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. PIC16C-series parts use a RISC architecture with only 35 single-word instructions, easing code development and minimizing learning curves for new designs. Key features of the PIC16C558-20E/P include the 20MHz maximum clock (5MHz oscillator input), 13 I/O pins, two 8-bit timers (Timer0, Timer2) plus one 16-bit timer (Timer1), a Watchdog Timer with its own on-chip RC oscillator, and wide operating voltage support. The -E suffix denotes the Extended automotive temperature grade (-40C to +125C), distinguishing it from commercial/industrial grade variants. The 18-pin PDIP package is through-hole for prototyping and legacy designs. The PIC16C558 architecture uses a Harvard-style separate program/data bus design with a 14-bit instruction word. This contrasts with later PIC16F flash parts which offer re-programmability. The OTP memory requires a device programmer at production time but offers lower per-unit cost in mature, unchanging firmware applications. Typical applications include automotive body controllers, appliance controls, sensor signal conditioning, simple motor control, and industrial automation subsystems. The extended temperature grade makes it particularly attractive for under-hood automotive modules and harsh industrial environments. The legacy 18-pin PDIP footprint suits through-hole assembly lines and educational/development platforms where socketed parts are preferred. When designing with this part, note that OTP devices cannot be reprogrammed in-circuit - firmware bugs require part replacement. Designers should prototype with the pin-compatible PIC16F558 (flash) variant, then transition to PIC16C558-20E/P for cost-optimized production runs. Decoupling capacitors (100nF) must be placed within 6mm of VDD, and unused I/O pins should be configured as outputs to minimize current draw. This page synthesizes distributor pricing, drop-in PIC16C558 family alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C558-20E/SS - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
PIC16C558-20E/SS

PIC16C558-20E/SS - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C558-20E/SS is an EPROM/OTP-based 8-bit CMOS microcontroller from the PIC16C family, offering 3.5KB (2K x 14) of program memory, 128 bytes of RAM, and a 20MHz maximum operating frequency in a 20-pin SSOP package. It executes single-cycle instructions in 200ns and uses Microchip's PIC RISC architecture with only 35 single-word instructions, simplifying firmware development for embedded control loops. The /E suffix marks the Extended automotive temperature grade (-40C to +125C). An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, program memory, RAM, and peripherals designed to read sensors and drive actuators in real time. MCUs sit at the lowest tier of the compute hierarchy - below microprocessors and SoCs - and trade raw speed for deterministic I/O handling, low power draw, and predictable interrupt latency. The PIC16C family occupies the mid-range PIC tier, balancing instruction efficiency, peripheral integration, and cost for industrial and automotive embedded designs. Key features of the PIC16C558-20E/SS include 13 digital I/O pins, a 20MHz internal oscillator (4x PLL from a 5MHz source), one 8-bit timer and one 16-bit timer, a watchdog timer with on-chip RC oscillator, and brown-out reset for power-supply monitoring. The device operates from 3.0V to 5.5V, supports in-circuit serial programming (ICSP), and integrates an 8-bit ADC on selected pins. Its 20-pin SSOP (5.30mm body) footprint makes it drop-in compatible with the PIC16C554 family. Architecturally, the PIC16C558 uses a Harvard bus with separate program and data paths, an 8-bit ALU, and a hardware stack that supports direct, indirect, and relative addressing. The OTP program memory enables prototype-friendly one-time programming, while the EPROM-based cell supports windowed erasing during development. With 2K x 14 instructions and 128 bytes of data RAM, it targets applications that need more code space than the PIC12C/PIC16C5x baseline but less than the PIC16C7x peripheral-rich tier. Typical applications include automotive body controllers, HVAC damper drivers, lighting ballasts, appliance control boards, security keypads, and remote sensor interfaces. The Extended temperature grade and robust brown-out reset make it particularly attractive for under-hood automotive and outdoor industrial installations. When designing in this part, ensure your firmware budget stays under 2K words (3.5KB OTP) and that the ICSP pins are reserved on production boards to allow field reprogramming during qualification. The PIC16C554-20I/SS shares the same SSOP-20 footprint and can serve as a mask-ROM alternative once the design is frozen. This page synthesizes distributor availability, drop-in PIC16C family alternatives, and practical design notes that go beyond the bare Microchip datasheet, helping engineers select, source, and qualify the PIC16C558-20E/SS faster.

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PIC16C558-20I/P - 20MHz 8-bit OTP MCU, 3.5KB EPROM, 18-PDIP | Microchip
PIC16C558-20I/P

PIC16C558-20I/P - 20MHz 8-bit OTP MCU, 3.5KB EPROM, 18-PDIP | Microchip

The Microchip Technology PIC16C558-20I/P is an EPROM-based 8-bit CMOS microcontroller built on the PIC16 architecture, delivering 20 MHz (200 ns instruction cycle) performance with 3.5 KB of OTP program memory, 128 bytes of RAM, and 13 I/O pins in an 18-pin PDIP through-hole package. The -20 speed grade and 3.3 V/5 V dual-rail operation suit it to industrial-grade (-40 °C to +85 °C) embedded control, and the 35 single-word instruction RISC core simplifies code development while preserving deterministic interrupt response. The device is a one-time-programmable (OTP) variant of the PIC16C55x family, aimed at cost-sensitive volume production where in-system re-programmability is not required. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral I/O on one die. The PIC16C558 belongs to the mid-range PIC microcontrollers category, which sits inside the broader 8-bit MCU taxonomy (8-bit MCU -> microcontroller -> embedded processor -> semiconductor). Mid-range PIC parts extend baseline PIC12/PIC14 devices with more interrupts, larger memory, and a richer peripheral set, while remaining cheaper and simpler than 16-bit dsPIC or 32-bit PIC32 parts. Key features include 200 ns instruction execution at 20 MHz, 14-bit instruction width, two 8-bit timers (Timer0, Timer2) plus a 16-bit Timer1, a 10-bit (approximate) capture/compare/PWM module, 8-bit parallel port architecture, and a programmable watchdog timer with on-chip RC oscillator. Power-saving features include SLEEP mode with wake-up on pin change, and the device supports in-circuit serial programming (ICSP) despite the OTP program memory, allowing prototype code drop-in to OTP shipping units. The architecture is a Harvard RISC design with separate program (14-bit) and data (8-bit) buses, eliminating fetch bottlenecks and giving deterministic single-cycle execution for most instructions. The OTP memory cell uses a one-time-fuse bit per instruction word, providing non-volatile storage after programming. Brown-out reset (BOR), power-on reset (POR), and a configurable oscillator selection (LP, XT, HS, RC) make the part tolerant of noisy industrial supplies and a wide range of crystal frequencies. Typical applications include appliance control boards, automotive body electronics subsystems, industrial sensor interfaces, simple closed-loop fan or pump controllers, and low-cost user-interface panels where the PIC16C558-20I/P can replace larger 40-pin MCUs. The 18-pin PDIP footprint remains popular in through-hole manufacturing lines and in legacy designs that need a stable, long-lifecycle controller. When designing with this device, allocate one full 5 V-tolerant port for the ICSP interface even in production units, because OTP parts still require ICSP for the initial code load. Decouple VDD/VSS with a 100 nF ceramic placed within 5 mm of the pins, and configure the MCLR pin with the standard 10 kΩ pull-up plus a 100 nF reset-delay capacitor to ensure clean power-on behavior. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, organized for both procurement and engineering audiences.

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PIC16C558-20I/SO - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
PIC16C558-20I/SO

PIC16C558-20I/SO - 8-Bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C558-20I/SO is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of OTP program memory, 128 bytes of RAM, and 13 I/O pins, packaged in an 18-pin SOIC (SO) wide-body 7.50mm width tube. It executes instructions in a 200ns instruction cycle at 20MHz and operates from a 3.0V to 5.5V supply. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non‑volatile program memory, working RAM, and peripheral interfaces such as timers, interrupts, and I/O. The PIC16C family is one of the foundational Microchip PIC architectures and sits within the broader taxonomy: microcontroller → embedded processor → semiconductor IC → electronic component. Within the power and signal hierarchy, an MCU orchestrates sensors, actuators, and communication interfaces while the system power supply, often an LDO or DC-DC converter, feeds it. Key features of the PIC16C558-20I/SO include 35 single-word instructions, a RISC architecture with 14-bit instruction width, an 8-level deep hardware stack, a watchdog timer, power-on reset, power-saving SLEEP mode, and an internal oscillator option on certain family members. The device is OTP (One-Time Programmable), meaning the program memory can be written only once by the user, distinguishing it from flash-based PIC16F successors. The wide-body SOIC (SO) package measures 0.300 inch (7.50mm) and ships in anti-static tubes for prototyping and low-volume production. Designed for cost-sensitive embedded control, the PIC16C558-20I/SO is widely deployed in white-goods controls, simple sensor interfaces, automotive body electronics, and industrial timers. Its 13 I/O pins comfortably drive LED indicators, keypads, relays, and serial links, while the 20MHz clock supports time-critical loops such as UART bit-banging or PWM motor control. Typical applications include appliance control boards (washing machines, microwave ovens, coffee makers), HVAC thermostat logic, low-end battery chargers, and remote sensor nodes. The wide VCC range and industrial temperature rating (-40C to +85C for the -I grade) suit harsh environments. When designing, note that OTP memory cannot be reprogrammed, so firmware must be fully validated before programming. The device has no built-in debug interface; development relies on the ICD header or production programmers, and emulator compatibility should be confirmed via the Microchip compatibility chart (DeviceDoc 00148J2). This page synthesizes current distributor pricing, drop-in alternative candidates, and practical engineering notes beyond what the manufacturer datasheet alone provides.

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PIC16C558-20I/SS - 8-bit OTP MCU 3.5KB EPROM 20MHz SSOP-20 | Microchip
PIC16C558-20I/SS

PIC16C558-20I/SS - 8-bit OTP MCU 3.5KB EPROM 20MHz SSOP-20 | Microchip

The Microchip Technology PIC16C558-20I/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, integrating 3.5KB of one-time-programmable (OTP) program memory, 128 bytes of RAM, and 13 general-purpose I/O pins in a 20-pin SSOP (Shrink Small Outline Package). The '20' suffix indicates a 20MHz maximum clock, yielding 200ns instruction cycle time, and 'I' denotes the industrial -40C to +85C operating temperature grade. The part operates from 3.0V to 5.5V supply and uses Microchip's RISC instruction set of 35 single-word instructions. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals, and timers on one silicon die, optimized for embedded control tasks. PIC16C MCUs sit in the hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. They are widely used in cost-sensitive, low-power applications where deterministic real-time response and a small code footprint outweigh the need for large memory or analog peripherals. The 'C' suffix denotes EPROM-based program memory, distinguishing these from flash-based 'F' variants in the same pinout family. Key features of the PIC16C558-20I/SS include a 200ns instruction cycle (5 MIPS at 20MHz), 8-bit data path, 13 digital I/O pins, one 8-bit timer/counter (TMR0) with optional watchdog, power-on reset, brown-out detection, and an internal RC oscillator option. The device supports in-circuit serial programming (ICSP) for development despite the OTP program memory, which cannot be erased after programming. The architecture uses a Harvard design with separate program and data buses, enabling single-cycle instruction fetch with simultaneous data access. The 14-bit wide program word accommodates the 35-instruction opcode set plus literal data, while the 8-bit data bus handles SRAM access. The industrial-grade silicon supports operation across automotive, industrial, and consumer temperature windows. Typical applications include appliance control, sensor signal conditioning, low-end motor control, LED drivers, battery chargers, and automotive body electronics. The 20MHz clock rate enables timing-sensitive tasks like IR remote decoding, RC servo control, and basic UART bit-banging. The 13 I/O pins can directly drive LEDs, relays, and small solenoids through internal weak pull-ups. Designers must note that OTP memory cannot be reprogrammed, so development requires ICSP with a windowed ceramic package for code iteration or migration to the flash-based PIC16F558 successor. Use a 100nF decoupling capacitor within 5mm of VDD, and ensure MCLR is tied high through a 10k resistor for normal operation. This page synthesizes distributor inventory, parametric drop-in alternatives, and practical design notes that complement the manufacturer datasheet, helping engineers evaluate this legacy OTP MCU for both new designs and existing product maintenance.

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PIC16C558/JW - 8-Bit 20MHz OTP MCU 18-CERDIP | Microchip
PIC16C558/JW

PIC16C558/JW - 8-Bit 20MHz OTP MCU 18-CERDIP | Microchip

The Microchip Technology PIC16C558/JW is an 8-bit CMOS EPROM-based microcontroller built on Microchip's PIC® 16C architecture, delivering 20 MHz core clock performance in an 18-pin CERDIP through-hole package. According to the Microchip product page, the device features 3.5 KB of EPROM program memory (organized as 2K x 14), 128 bytes of RAM, 13 programmable I/O pins, and 35 single-word instructions executing in 200 ns cycles. The /JW package suffix denotes the windowed CERDIP variant, allowing UV-erasable reprogramming during prototype development. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, working RAM, and programmable I/O peripherals on one die. The PIC16C5x family sits at the foundation of Microchip's PIC architecture: 12-bit wide instruction bus with an 8-bit data path, two-level hardware stack, direct/indirect/relative addressing, and a 12 I/O architecture optimized for compact, deterministic control loops. PIC microcontrollers are widely used as glue logic, sensor interface controllers, and battery-powered embedded supervisors where small footprint and low cost dominate over raw throughput. Key features of the PIC16C558 include a 20 MHz maximum operating frequency (4 MHz in low-frequency parts), 3.0 V to 6.25 V single-supply operation, integrated Power-On Reset (POR), Watchdog Timer (WDT), and a 8-bit real-time counter/timer (TMR0). The 18-CERDIP windowed package exposes the die for UV erasure, making this part suitable for engineering prototypes and small production runs where code iteration is expected. Operating temperature range spans commercial 0 °C to +70 °C. Architecturally, the PIC16C558 implements a RISC-style Harvard design with separate program and data buses. The 35-instruction instruction set simplifies code generation in assembly or C, while the deterministic 200 ns instruction cycle supports tight real-time loops without pipeline surprises. The two-level deep hardware stack limits subroutine nesting but eliminates the runtime overhead of a software stack pointer. Typical applications include industrial appliance controllers, automotive body modules (pre-CAN era), security alarm panels, sensor signal conditioning, low-cost motor control, and embedded instrumentation. The windowed CERDIP package is preferred over OTP plastic variants when firmware iteration is required during development or for low-volume production that benefits from reprogramming. A primary design consideration is that the /JW package requires a quartz window for UV erasure; field-deployed units should use the OTP plastic equivalents (PIC16C558-04/P or PIC16C558-20I/SO). Developers should also account for the two-level hardware stack limitation when porting C code originally written for larger PIC families. This page consolidates Microchip and distributor specifications, pin-compatible alternatives in the CERDIP/P-DIP package family, and practical design notes that are not collected in the manufacturer datasheet PDF alone.

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PIC16C558T-04/SO - 8-bit 4MHz MCU, 3.5KB OTP, 18-SOIC | Microchip
PIC16C558T-04/SO

PIC16C558T-04/SO - 8-bit 4MHz MCU, 3.5KB OTP, 18-SOIC | Microchip

The Microchip Technology PIC16C558T-04/SO is an 8-bit CMOS OTP-based microcontroller from the PIC16C5x family, executing one instruction every 200 ns at 4 MHz and packaged in an 18-pin SOIC (SO) wide-body outline. It integrates 3.5 KB of one-time-programmable program memory (2K x 14 words), 128 bytes of RAM, and 13 digital I/O pins in a compact surface-mount form factor. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, and programmable I/O peripherals on one die. Within the broader taxonomy, this device sits in the 8-bit microcontrollers category, which belongs to microcontrollers and, higher up, integrated circuits and semiconductors. PIC16C5x parts are classical Harvard-architecture MCUs using the PIC instruction set, and they were widely adopted in automotive, industrial, and appliance products because of their small footprint, deterministic timing, and only 35 single-word instructions. Key features include a 4 MHz maximum oscillator frequency (4 MHz internal instruction rate of 5 MIPS equivalent), a 12-bit instruction word, 8-bit data path, 2.0 V to 6.25 V operating voltage range (the /SO part is the commercial 0 to +70 C grade), an 8-bit timer/counter, watchdog timer, internal pull-ups on port B, and code protection. The 18-SOIC wide-body package offers 7.5 mm (0.300 inch) creepage distance, which is useful when the part sits next to mains-isolated sections in consumer white goods. The PIC16C558T-04/SO uses Microchip's proven OTP process technology, allowing prototype cost flexibility while still offering one-time field programming. The architecture separates program and data buses (Harvard) so that an instruction fetch and a data access happen in parallel, simplifying deterministic timing for control loops. With 13 usable I/O pins, designers can drive LED indicators, read keypad matrices, and interface to sensors without external glue logic. Typical applications include automotive body controllers and interior lighting, industrial control panels, appliance controllers (rice cookers, microwave ovens, washing machines), low-end remote-control toys, simple sensor interfaces, and battery chargers. The /04 speed grade specifies 4 MHz maximum oscillator, while the /SO suffix designates the SOIC wide-body commercial package. When designing with this device, remember that OTP memory cannot be erased, so firmware must be fully validated before committing to production units. Decoupling the VDD pin with 0.1 uF ceramic placed within 5 mm of the package, plus a bulk 1-10 uF tantalum or aluminum capacitor, is recommended for noisy industrial environments. This page synthesizes distributor pricing, drop-in same-package alternatives from the Microchip PIC16C5x family, and practical design notes that go beyond what the manufacturer datasheet alone provides, giving engineers a complete selection view.

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PIC16C558T-04/SS - 8-Bit OTP MCU, 4MHz, 3.5KB | Microchip
PIC16C558T-04/SS

PIC16C558T-04/SS - 8-Bit OTP MCU, 4MHz, 3.5KB | Microchip

The Microchip PIC16C558T-04/SS is an 8-bit CMOS OTP-based microcontroller in the PIC® 16C family, delivering 4 MHz CPU performance with 3.5 KB (2K × 14) of program memory in a 20-pin SSOP package. It features 35 single-word instructions, 200 ns instruction execution time, and 13 bidirectional I/O pins suitable for cost-sensitive embedded control. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, integrating a CPU, RAM, ROM/Flash/EPROM, and peripherals. OTP (One-Time Programmable) variants use EPROM-based program memory, which is programmed once with a device programmer and cannot be erased, making OTP MCUs the lowest-cost option for high-volume, fixed-code consumer and industrial products. PIC microcontrollers follow the RISC (Reduced Instruction Set Computer) Harvard architecture, separating program and data memory buses for deterministic instruction timing. Key features of the PIC16C558T-04/SS include 4 MHz maximum operating frequency, 128 bytes of RAM, 13 I/O pins with individual direction control, a watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and an operating voltage range of 3.0 V to 6.25 V. The '04' speed suffix indicates a 4 MHz oscillator; the 'T' suffix denotes tape-and-reel packaging; '/SS' designates the 20-pin SSOP (Shrink Small Outline Package). The PIC16C558T-04/SS uses a 14-bit-wide instruction word and 8-bit data path, with a hardware stack and interrupt logic supporting wake-up from SLEEP on pin change. Code protection is enabled via EPROM fuse bits. Compared with Flash-based PIC16F parts, this OTP MCU is intended for mature, high-volume programs where field firmware updates are not required. Typical applications include appliance control, sensor signal conditioning, low-speed serial control loops, hobby and educational projects, LED driving, and replacement of discrete logic in fixed-function control boards. The 13 I/O pins can source/sink up to 25 mA per pin, sufficient to drive small relays, solenoids, and LED arrays directly. When designing with this part, ensure your programming flow includes EPROM fuse configuration because code protection cannot be changed once blown. For new designs, evaluate Flash-based PIC16F equivalents first; the OTP variant is most cost-effective for locked, high-volume code. This page synthesizes distributor pricing, drop-in alternatives, and design notes that go beyond the bare datasheet content to help engineers select, source, and qualify the PIC16C558T-04/SS with confidence.

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PIC16C558T-04E/SS - 4MHz 8-bit OTP MCU, 20-SSOP | Microchip
PIC16C558T-04E/SS

PIC16C558T-04E/SS - 4MHz 8-bit OTP MCU, 20-SSOP | Microchip

The Microchip Technology PIC16C558T-04E/SS is an 8-bit CMOS OTP-based microcontroller in the PIC® 16C family, delivering 4MHz CPU clock speed, 3.5KB (2K x 14) of One-Time Programmable program memory, 128 bytes of RAM, and 13 programmable I/O pins, all packaged in a 20-pin SSOP (5.30 mm body). It executes instructions in 200 nanoseconds through a RISC architecture with only 35 single-word instructions, balancing deterministic performance with low power consumption in a compact 18-pin-equivalent footprint. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and configurable peripherals. OTP microcontrollers store program code in one-time-programmable EPROM cells that retain data without power but cannot be rewritten, making them well-suited to cost-sensitive volume production where firmware is stable. The PIC16C558 belongs to the PICmicro mid-range family - a lineage of 8-bit MCUs known for deterministic interrupt latency, a Harvard memory architecture, and an instruction set optimized for compiled C and hand-written assembly. Key features include a 4MHz internal oscillator-friendly design with external clock option, 128 x 8 bytes of general-purpose RAM, Power-On Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, 13 bi-directional digital I/O pins, and code-protection support. The industrial-grade temperature range of -40C to +125C and 3.0V to 5.5V supply enable deployment in factory-floor and consumer applications. The PIC16C558 uses a 14-bit instruction word with an 8-bit data path, separating program and data buses (Harvard architecture) so instruction fetch and data access occur in the same cycle. Peripherals are minimal by design: POR, WDT, and a programmable prescaler - this simplicity keeps quiescent current low and lets the MCU wake quickly from sleep. Typical applications include industrial sensor interfaces, consumer appliance control, automotive body electronics (non-safety), HVAC thermostat controllers, and low-end motor control. The OTP memory is favored where unit cost dominates over firmware flexibility. The 20-SSOP package offers a small PCB footprint suitable for hand-held and space-constrained designs. When designing with the PIC16C558, evaluate code protection settings and pre-program all units before final test because OTP cannot be erased. Account for the 13 I/O limitation versus larger PIC16C variants (e.g., PIC16C56/57 with fewer I/O) when allocating pin resources. This page synthesizes distributor pricing, drop-in alternatives from the Microchip PIC16C family, and practical design notes not found in any single datasheet.

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PIC16C558T-04I/SO - 8-bit PIC MCU, 3.5KB OTP, 18-SOIC | Microchip
PIC16C558T-04I/SO

PIC16C558T-04I/SO - 8-bit PIC MCU, 3.5KB OTP, 18-SOIC | Microchip

The Microchip Technology PIC16C558T-04I/SO is a CMOS OTP-based 8-bit PIC microcontroller in a 200 ns instruction execution class, packaged in an 18-pin SOIC (SO) and rated for the -40C to +85C industrial temperature range (I-suffix). The device integrates 3.5KB (2K x 14 words) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, 13 digital I/O pins, and operates from a 2.5V to 5.5V supply. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile data memory (RAM), and programmable peripherals into one package. The PIC16C558 belongs to Microchip's mid-range PIC16C family, which uses a RISC architecture with 35 single-word instructions. Within the broader component taxonomy, an MCU sits below the microprocessor/MCU hypernym and above the PIC16C mid-range sub-family; 8-bit MCUs like this one remain widely used in cost-sensitive, deterministic real-time applications. Key features of the PIC16C558T-04I/SO include a 4 MHz maximum oscillator frequency (the -04 speed grade), 13 bidirectional I/O pins with individual direction control, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a Watchdog Timer with its own on-chip RC oscillator for reliable recovery, Power-on Reset, Brown-out Reset, and an in-circuit serial programming capability. Code protection and oscillator selection options are programmed into the device's configuration bits. The architecture is built around a Harvard-separated program/data bus with a 14-bit instruction word, allowing most instructions to execute in a single 200 ns instruction cycle at 20 MHz. The '04 speed grade corresponds to a 4 MHz oscillator / 1 MHz instruction rate operation, simplifying EMI and power budgeting in industrial designs. Typical applications include appliance control, automotive subsystems (body electronics, sensors, lighting), industrial automation (sensor interfaces, low-cost PLC I/O expanders), security and access control panels, and remote-control transmitters. The wide 2.5V-5.5V supply range and robust reset architecture make it a fit for harsh, electrically noisy environments. When designing with the PIC16C558T-04I/SO, note that OTP memory cannot be re-programmed; for prototyping or field-upgradable firmware consider a Flash-based PIC16F equivalent. Place a 0.1 uF decoupling capacitor close to VDD, keep oscillator traces short, and respect the 4 MHz oscillator maximum for the -04 speed grade. This page synthesizes distributor pricing as of 2026-09-16, drop-in alternatives drawn from the PIC16C558 same-family cross reference, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16C558T-04I/SS - 8-Bit 4MHz OTP MCU, 3.5KB | Microchip
PIC16C558T-04I/SS

PIC16C558T-04I/SS - 8-Bit 4MHz OTP MCU, 3.5KB | Microchip

The Microchip Technology PIC16C558T-04I/SS is an 8-bit CMOS OTP-based microcontroller from the PIC® 16C family, featuring a 4MHz maximum clock speed, 3.5KB (2K x 14) of One-Time Programmable program memory, and 128 bytes of RAM, housed in a 20-pin SSOP (Shrink Small Outline Package) for surface-mount assembly. The device integrates 13 general-purpose digital I/O pins, a RISC instruction set with only 35 single-word instructions executing in a 200ns instruction cycle, and supports a supply voltage range compatible with both 3.3V and 5V systems. An OTP (One-Time Programmable) microcontroller is a non-flash, non-EEPROM MCU variant where the program memory can be written exactly once via a dedicated programmer and then becomes read-only permanently. In the broader semiconductor taxonomy, the PIC16C558 sits within 8-bit microcontrollers -> microcontrollers -> microcontrollers and processors -> integrated circuits -> semiconductors. OTP MCUs occupy a specific niche: they are cheaper than flash equivalents, ideal for high-volume mature products, and well-suited for cost-sensitive industrial and automotive subsystems where firmware is finalized and production quantities justify masking the code once. Key specifications of the PIC16C558T-04I/SS include 4MHz maximum oscillator frequency, 3.5KB OTP program memory (2K x 14-bit words), 128 bytes of data RAM, 13 digital I/O pins, two 8-bit timers (Timer0 and Timer2) and one 16-bit timer (Timer1), a watchdog timer with on-chip RC oscillator, and an operating temperature range of -40C to +85C (industrial grade, indicated by the 'I' suffix). The 20-pin SSOP package measures approximately 5.30mm body width with 0.65mm pitch. The device is built on a low-power CMOS process supporting both 3.3V and 5V operation. The RISC architecture ensures deterministic instruction timing with most instructions completing in a single 200ns cycle at 4MHz, simplifying real-time control loops. The integrated watchdog timer with dedicated on-chip RC oscillator enhances system reliability in noisy industrial environments, while the programmable code protection prevents unauthorized firmware readout. Typical applications include automotive subsystems (sensor interfaces, lighting controllers), industrial control (small appliance controllers, motor drivers), consumer electronics (remote controls, toys), and embedded control nodes requiring a minimal pin count. The 13 I/O pins make it suitable for human-machine interface (HMI) keypads and simple sensor front-ends. When designing with the PIC16C558T-04I/SS, engineers should plan firmware development around OTP one-time programming: prototype using a windowed (JW) or UV-erasable sibling for code iteration, then commit to the OTP version only after firmware is finalized. Note that the PIC16C558 is now legacy - for new designs, evaluate flash-based PIC16F equivalents. This page synthesizes distributor pricing, OTP-specific design notes, and a curated drop-in alternative list - practical information that supplements the manufacturer datasheet for legacy design support.

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PIC16C558T-20/SO - 8-bit 20MHz OTP MCU 3.5KB | Microchip
PIC16C558T-20/SO

PIC16C558T-20/SO - 8-bit 20MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16C558T-20/SO is an 8-bit RISC OTP (One-Time-Programmable) microcontroller built on the PIC16C5xx baseline architecture, delivering 20MHz maximum clock speed in an 18-pin SOIC package. The device integrates 3.5KB (2K x 14) of program memory, 128 bytes of SRAM, and 13 general-purpose digital I/O pins, and is offered in the tape-and-reel SOIC shipping format. The 'T' suffix denotes Tape & Reel packaging while '-20' indicates the 20MHz speed grade; the '/SO' suffix specifies the 18-lead 300-mil Small-Outline IC package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces into one package. Within the system hierarchy, an MCU sits above discrete logic and below microprocessors: it is a self-contained compute subsystem optimized for embedded control rather than high-throughput computation. Microchip's PIC baseline family (PIC16C5xx) is the lowest-cost and simplest tier of the PIC16 lineup, designed for cost-sensitive applications where code density and ease of programming outweigh the need for interrupts and advanced peripherals. Key features of the PIC16C558T-20/SO include the 35 single-word instruction RISC core that executes instructions in 200ns at 20MHz, a fixed watchdog timer (WDT) and Power-On Reset (POR) for unattended operation, and a wide operating voltage range of 3.0V to 5.5V. Unlike PIC16F and PIC16 enhanced mid-range parts, the PIC16C558 lacks interrupts, has a 12-bit program counter, and uses a 2-level hardware stack. The 13 I/O pins are organized as PORTA (RA0-RA3) and PORTB (RB0-RB7) plus RC0-RC1 in this 18-pin variant. Typical applications for this device include simple appliance controls, LED drivers, fan controllers, battery chargers, security keypads, and consumer toys where the OTP memory is acceptable and code density in 12-bit-wide words is sufficient. The wide commercial temperature grade and low pin count make it well-suited to compact hand-held products. When designing with the PIC16C558T-20/SO, ensure the OTP memory capacity (3.5KB) is sufficient for the target firmware and verify that the lack of interrupts and 2-level stack depth are compatible with the application complexity. The external RC or crystal oscillator configuration must follow the baseline PIC16C5xx reference designs because this family does not include the internal oscillator blocks of later PIC generations.

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PIC16C558T-20/SS - 8-Bit 20MHz OTP MCU 20-SSOP | Microchip
PIC16C558T-20/SS

PIC16C558T-20/SS - 8-Bit 20MHz OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C558T-20/SS is an 8-bit RISC-based CMOS microcontroller from the PIC16C5x family, featuring 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 20MHz maximum operating frequency, packaged in a 20-pin SSOP (Shrink Small Outline Package). Built on Microchip's classic PIC 16C5x baseline architecture with a 12-bit instruction word, the device delivers deterministic interrupt response and Harvard bus separation, supporting the same legacy instruction set as other PIC16C5x members. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller contains EPROM-based program memory that can be written once during production programming and cannot be electrically erased. Compared to flash-based MCUs, OTP parts offer lower unit cost for high-volume production runs where firmware is finalized, and they provide higher density and radiation tolerance. The PIC16C558T belongs to the broader 8-bit microcontroller category -> CMOS RISC microcontroller -> embedded controller -> MCU -> semiconductor, occupying the entry-level / cost-optimized tier of the PIC16C5x family tree. Key features include 13 I/O pins with individual direction control, two 8-bit timers (Timer0 and Timer2), a Watchdog Timer with on-chip RC oscillator, power-on reset, brown-out detection, and a 4-channel 8-bit ADC. The device operates from 2.5V to 5.5V and is rated for the commercial temperature range (0C to +70C). Its 20MHz clock rate yields a 200ns instruction cycle, sufficient for servo loops, sensor sampling, and simple protocol handling. The architecture uses a RISC-style pipeline with only 33 single-cycle instructions, dramatically simplifying code generation in assembly or C. Internal peripheral integration (ADC, timers, WDT, POR/BOR) eliminates many external components, enabling compact PCB layouts and reducing BOM cost. The SSOP-20 footprint is compatible with the rest of the PIC16C5x family (PIC16C554, PIC16C55, PIC16C57, PIC16C58) where pin counts match, allowing PCB reuse across product variants. Typical applications include appliance control, simple sensor interfaces, low-end consumer electronics, motor control front-ends, smart battery chargers, and remote controls. Engineers continue to design with PIC16C558 in legacy products where the OTP cost model fits the bill of materials and existing firmware has been qualified for years. The 'T' suffix indicates tape-and-reel packaging for high-volume SMT assembly. When designing with this part, ensure programming is completed before final PCB assembly because OTP memory cannot be updated in the field. Use Microchip's PICSTART Plus or MPLAB PM3 programmer, and verify code protection bits are set if intellectual property protection is required. Decoupling: place a 0.1uF ceramic capacitor directly across VDD/VSS within 5mm of the pins. This page synthesizes distributor stock data, drop-in alternatives from the PIC16C5x family, and design notes that go beyond the manufacturer datasheet to help engineers select, source, and integrate the PIC16C558T-20/SS.

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PIC16C558T-20E/SS - 8-Bit OTP MCU, 20MHz, 3.5KB | Microchip
PIC16C558T-20E/SS

PIC16C558T-20E/SS - 8-Bit OTP MCU, 20MHz, 3.5KB | Microchip

The Microchip Technology PIC16C558T-20E/SS is an 8-bit RISC microcontroller from the PIC16C family, featuring a 20 MHz maximum operating frequency, 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory, and 128 bytes of RAM, packaged in a 20-pin SSOP (Shrink Small Outline Package). The 'T' suffix denotes Tape and Reel packaging while the 'E' designator indicates the Extended industrial temperature grade of -40C to +125C, and 'SS' specifies the SSOP-20 package outline. An 8-bit microcontroller (MCU) is a small computing system on a single integrated circuit that combines a CPU, RAM, non-volatile program memory, and configurable I/O peripherals. PIC microcontrollers use a RISC (Reduced Instruction Set Computer) architecture with a Harvard memory structure, providing deterministic instruction execution in a single clock cycle for most instructions. PIC MCUs sit within the broader hierarchy of embedded microcontrollers, beneath microprocessors in complexity but above simple state machines in programmability. Key features of the PIC16C558T-20E/SS include 13 digital I/O pins, a 20 MHz internal oscillator operating frequency at 5V, an 8-bit timer/counter, watchdog timer, power-on reset, brown-out detection, and an instruction set of 35 single-word instructions. The OTP program memory allows the device to be programmed once and retains the code permanently without the need for external program storage. The PIC16C558 architecture employs a 14-bit instruction word with a 14-bit program memory bus, distinct from the 8-bit data bus. This dual-bus Harvard architecture enables simultaneous instruction fetch and data access, achieving near one-instruction-per-clock throughput. The device operates from 3.0V to 5.5V supply voltage and is fabricated using Microchip's proprietary CMOS process with low-power CMOS technology. Typical applications include industrial control systems, automotive body electronics, sensor interfacing nodes, low-cost consumer appliances, and battery-powered embedded devices. The extended temperature range and OTP memory make it suitable for high-volume production where code is finalized and reprogramming is unnecessary. When designing with this OTP device, ensure code is fully validated before programming since OTP cannot be erased or rewritten. Engineers should use the equivalent flash-based PIC16F558 for prototype development and validation, then transition to this OTP version for cost-optimized production runs. This page synthesizes distributor pricing snapshots, same-brand Microchip drop-in alternatives, and practical design guidance not aggregated in any single manufacturer document, enabling faster sourcing and engineering decisions.

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PIC16C558T-20I/SO - 8-Bit 20MHz 3.5KB OTP MCU | Microchip
PIC16C558T-20I/SO

PIC16C558T-20I/SO - 8-Bit 20MHz 3.5KB OTP MCU | Microchip

The Microchip Technology PIC16C558T-20I/SO is a member of the PIC16C5x family of 8-bit RISC microcontrollers, featuring a 20MHz maximum clock rate, 3.5KB (2K x 14) of One-Time-Programmable (OTP) program memory, and 128 bytes of RAM, all housed in an 18-pin SOIC package. It executes instructions in a 200ns instruction cycle and operates from a single 3.0V to 5.5V supply, drawing only a few milliamps during normal operation. A microcontroller (MCU) is a single-chip computer containing a CPU, memory, and programmable I/O peripherals. The PIC16C5x family uses a Harvard-architecture RISC core with 33 single-word instructions, delivering deterministic throughput for embedded control. Within the broader hierarchy, the PIC16C558 sits between the smaller PIC12/14 families (typically 6-14 pins) and the larger PIC16F and PIC18 families; it is designed for cost-sensitive 18-pin applications that need more code space than PIC16C54/55/56 but fewer peripherals than modern PIC16F1xxx devices. Key features of the PIC16C558T-20I/SO include 13 digital I/O pins, a Power-On Reset (POR), Watchdog Timer (WDT), and a Timer0 8-bit counter/timer. The '20' speed suffix indicates the 20MHz maximum oscillator frequency, while the 'T' indicates tape-and-reel packaging, 'I' specifies the industrial -40C to +85C operating temperature range, and '/SO' denotes the 18-pin SOIC outline. The OTP memory is programmed once via standard Microchip device programmers, making the part ideal for high-volume, low-cost field-deployed products where firmware is stable and flash reprogrammability is not required. Typical applications include appliance controllers, sensor signal conditioning front-ends, simple motor control drivers, automotive body electronics, lighting controllers, low-end remote keyless entry transmitters, security alarm panels, and battery-powered instrumentation. Because OTP memory cannot be erased and rewritten, designers typically prototype with the PIC16F558 (Flash) equivalent and migrate to the PIC16C558 once firmware is finalized. A key design consideration is migration from the Flash PIC16F558: the two parts share pinout and core peripherals, allowing a single PCB to support both. Use a 4.7kohm pull-up on MCLR/VPP and 100nF decoupling on VDD, with a 22pF or 33pF load capacitor pair on OSC1/OSC2 for a crystal oscillator reference design.

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