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PIC18C252-I/SP - 8-bit OTP MCU 32KB Flash 40MHz | Microchip
PIC18C252-I/SP

PIC18C252-I/SP - 8-bit OTP MCU 32KB Flash 40MHz | Microchip

The Microchip Technology PIC18C252-I/SP is a high-performance 8-bit CMOS One-Time Programmable (OTP) microcontroller from the PIC18C family, delivering 10 MIPS at 40 MHz with only 77 single-word instructions. Housed in a 28-pin SPDIP (SP) through-hole package, the device integrates 32 KB of OTP program memory (16K x 16 words), 1.5 KB of data RAM, and 23 digital I/O pins. According to the Microchip product page, the manufacturer actively recommends designers consider the flash-based PIC18F252 as a newer alternative for new designs, indicating the PIC18C252 is positioned in mature legacy sockets. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and peripheral interfaces. The PIC18 family sits within the larger PIC RISC architecture hierarchy: PIC18C -> enhanced 8-bit PIC -> 8-bit PIC microcontroller -> microcontroller -> embedded semiconductor. PIC18C devices specifically combine Harvard architecture, 16-bit-wide instructions, and C-optimized peripheral sets, making them a step above baseline PIC16 parts in both performance and addressable memory. Key features of the PIC18C252-I/SP include an integrated 10-bit Analog-to-Digital Converter (ADC) with multiple input channels, three timer modules, a Capture/Compare/PWM (CCP) module, and hardware serial interfaces including I2C, SPI, and USART. The wide 2.0V to 5.5V operating range and industrial -40C to +85C temperature grade suit both battery-powered and industrial environments. The OTP program memory allows one-time field programming, useful for low-cost production units where firmware changes are not anticipated. The device implements the PIC18 instruction set with 16-bit opcodes and an 8-bit data path, supporting linear program memory addressing up to 32 KB and a banked RAM architecture. A hardware multiplier and 31-level deep stack support C compilers and interrupt-driven designs. Brown-out Reset (BOR), Watchdog Timer (WDT), and In-Circuit Serial Programming (ICSP) are integrated. Typical applications include industrial control subsystems, appliance controllers, automotive body electronics, sensor signal conditioning with on-chip ADC, and low-cost consumer devices. The SPDIP-28 footprint is breadboard-friendly for prototyping and field-replaceable designs. Design tip: because the PIC18C252-I/SP is OTP-based, plan firmware carefully - any code revision requires a new part. For iterative development or field updates, migrate to the flash-based PIC18F252 in the same SPDIP-28 pinout. This page synthesizes Microchip distributor pricing, parametric comparison vs flash-based PIC18F alternatives, and practical design notes beyond the manufacturer datasheet, with content tailored for engineers maintaining legacy systems.

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PIC18C252/JW - 8-Bit 40MHz 32KB EPROM 28-CerDip MCU | Microchip
PIC18C252/JW

PIC18C252/JW - 8-Bit 40MHz 32KB EPROM 28-CerDip MCU | Microchip

The Microchip Technology PIC18C252/JW is an 8-bit PIC18-family CMOS microcontroller with 32KB (16K x 16) of UV-erasable EPROM program memory and 1.5KB of RAM, packaged in a 28-pin windowed ceramic DIP (CerDIP) for in-circuit prototype development and field-reprogrammable applications. It executes instructions at up to 10 MIPS from a 40 MHz oscillator input, with 100 ns minimum instruction cycle, and integrates on-chip peripherals including Brown-out Detect/Reset, Low-Voltage Detect, Power-on Reset, PWM modules, and a Watchdog Timer. An 8-bit microcontroller (MCU) is a single-chip computer built around a CPU core, program memory, data RAM, and integrated peripherals such as timers, ADC, communication ports, and I/O. PIC18-family MCUs belong to Microchip's enhanced mid-range 8-bit RISC architecture, which sits hierarchically between the legacy PIC16 mid-range and the PIC17 high-end series, and forms the foundation of Microchip's PIC architecture (micros, microcontrollers, semiconductors, integrated circuits). The /JW suffix denotes a windowed ceramic package that allows UV erasure of the EPROM array for repeated development cycles - a hallmark of legacy OTP-based PIC18C devices. Key features include a C-compiler-optimized RISC architecture with only 77 single-word instructions, source-code compatibility with PIC16CXX devices, a hardware single-cycle 8x8 multiplier, eight-level priority interrupt controller, and dual 16-bit Capture/Compare/PWM modules. The 28-pin windowed CerDIP is rated for the commercial 0C to +70C range and supports 23 digital I/O lines for user application interfaces. Typical applications include embedded control prototypes, industrial automation controllers, instrumentation front-ends, motor control loops, and educational development platforms where UV-erasable program memory accelerates firmware iteration. The windowed package is also preferred for low-volume production runs and field firmware updates via UV erasure. When designing with this part, verify that in-circuit socketing accommodates the 0.600-inch wide CerDIP body and the quartz window. Migration to the pin-compatible flash-based PIC18F252 is recommended for new designs because OTP/EPROM devices are NRND - the silicon is mature and Microchip explicitly recommends PIC18F252 as the modern replacement. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC18C252T-E/SO - 8-Bit 40MHz OTP MCU, 32KB, 28-SOIC | Microchip
PIC18C252T-E/SO

PIC18C252T-E/SO - 8-Bit 40MHz OTP MCU, 32KB, 28-SOIC | Microchip

The Microchip Technology PIC18C252T-E/SO is an 8-bit PIC18C-series RISC microcontroller built on a CMOS OTP process, delivering 10 MIPS throughput at 40 MHz and packaged in a 28-pin SOIC (SO, 0.295 inch / 7.50 mm body width) for surface-mount tape-and-reel assembly. It integrates 32 KB of OTP program memory (16K x 16 words) and 1.5 KB of on-chip RAM, plus a 10-bit A/D converter, making it a member of the PIC18C high-performance microcontroller family that also includes the PIC18C242 (28-pin), PIC18C442 (40-pin) and PIC18C452 (40-pin) variants. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, typically offering low cost, deterministic interrupt response and rich peripheral integration. Within the broader taxonomy, the PIC18C252 belongs to the microcontroller class of microcontrollers, itself a sub-category of microcontrollers, which in turn sit under embedded computing and semiconductors. The PIC18C architecture specifically targets applications that need more code space, more RAM and higher throughput than legacy PIC16 designs while retaining the standard PIC instruction-set compatibility and the familiar PIC toolchain (MPLAB IDE, MPASM, PIC C compilers). Key features of the PIC18C252T-E/SO include 10-bit A/D conversion with multiple input channels, 77 single-word instructions (most single-cycle at 40 MHz), an internal oscillator option on selected family members, hardware USART, MSSP (SPI/I2C), capture/compare/PWM modules, and a wide 2.0 V to 5.5 V operating range. The 'T' suffix indicates Tape and Reel packaging, the 'E' indicates the Extended temperature grade (-40C to +125C), and 'SO' indicates the 28-pin SOIC package. Typical applications include industrial control, automotive subsystems, white goods, motor control, sensor signal conditioning, and general-purpose embedded control where deterministic 8-bit performance with abundant program memory is required. Designers favor this part when the application code exceeds PIC16 limits and when the firmware must be locked in OTP for cost-sensitive production. When designing with the PIC18C252T-E/SO, note that Microchip recommends migrating to the flash-based PIC18F252 for new designs because the PIC18C252 is positioned as a legacy/OTP device and is subject to long-term availability constraints. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC18C252T-I/SO - 32KB EPROM 8-bit MCU 28-SOIC | Microchip
PIC18C252T-I/SO

PIC18C252T-I/SO - 32KB EPROM 8-bit MCU 28-SOIC | Microchip

The Microchip Technology PIC18C252T-I/SO is an OTP-based 8-bit RISC microcontroller in the PIC18C family, offering 32KB of EPROM program memory, 1.5KB of RAM, and 22 digital I/O pins. It is supplied in a 28-pin SOIC wide-body (7.5mm) package, tape and reel packed, and operates from a single 5V supply across the industrial -40C to +85C temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (ROM/EPROM/Flash), and peripheral I/O on one die. The PIC18 family uses an enhanced RISC Harvard architecture with separate program and data buses, 16-bit wide instructions, and an 8-bit data path. MCUs sit inside the embedded computing hierarchy: microcontroller -> embedded processor -> semiconductor IC. They are the workhorse of low-power, deterministic control applications where a full application processor would be over-specified. Key features of the PIC18C252T-I/SO include 10 MIPS peak execution (40 MHz oscillator / 4 MHz-10 MHz input clock with PLL), 8 priority levels for interrupts, a single-cycle hardware 8x8 multiplier, an external oscillator interface, and 5V single-supply operation. The EPROM-based program memory allows windowed reprogramming for prototyping and short production runs; Microchip explicitly recommends PIC18F252 (Flash) for new designs. Architecturally, the device combines a 16-bit instruction word with an 8-bit data path, a 77-instruction set with single-word encoding, and a peripheral set that includes timers, a 10-bit A/D converter, and capture/compare/PWM modules. Power management is supported through sleep/Idle modes with fast wake-up. With OTP program memory, the PIC18C252T-I/SO suits low-volume or legacy system refreshes rather than high-volume flash production. Typical applications include industrial control, motor control front-ends, sensor signal conditioning with on-chip ADC, automotive body and HVAC subsystems, and any 5V embedded design that still requires EPROM-based firmware storage. The wide SOIC footprint also aids hand-soldering for prototyping and field rework. When designing with this MCU, allocate sufficient decoupling near VDD/VSS pins and verify timing margins on the external oscillator, since the 10 MIPS peak assumes a clean clock reference.

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PIC18C442-E/P - 8-bit 40MHz 16KB OTP MCU | Microchip 40-DIP
PIC18C442-E/P

PIC18C442-E/P - 8-bit 40MHz 16KB OTP MCU | Microchip 40-DIP

The Microchip Technology PIC18C442-E/P is a high-performance 8-bit CMOS microcontroller built on the PIC18C architecture with 16KB (8K x 16) of One-Time-Programmable (OTP) program memory, 512 bytes of RAM, and a 40 MHz maximum operating frequency delivering up to 10 MIPS of throughput. It is housed in a 40-pin PDIP (Plastic Dual In-line Package, 0.600" / 15.24 mm body) for through-hole mounting. As a member of the PIC18C family, this device sits in the broader 8-bit MCU taxonomy: microcontroller -> embedded controller -> PIC microcontroller -> PIC18C series. PIC18C parts introduced the enhanced PIC18 instruction set with 16-bit wide instructions and an 8-bit wide data path, 77 single-word instructions, a hardware single-cycle 8x8 multiplier, and a vectored interrupt controller with multiple priority levels, superseding the earlier PIC16C/PIC17C families while remaining source-code compatible at the architectural level. Key features include a 10-bit analog-to-digital converter (ADC) with up to 8 input channels, three external hardware interrupt sources, a USART/SCI port, a master/slave SPI port, and a master I2C port. Capture/Compare/PWM (CCP) modules support timing and motor-control applications. The -E suffix denotes the extended industrial temperature grade of -40C to +125C. The external oscillator interface accepts a 4-10 MHz crystal or a 40 MHz clock input directly. Architecturally, the PIC18C442 implements a Harvard-style CPU with separate program and data buses, a 31-level hardware stack, and a programming model compatible with PIC16 mid-range parts. The OTP program memory is windowless, requiring no UV erase, simplifying manufacturing flow but removing field-upgrade capability. Designers upgrading to a flash-based equivalent should consider the PIC18F442 as the recommended migration path. Typical applications include industrial control panels, automotive body electronics, consumer appliances, HVAC thermostats, and general-purpose embedded designs that benefit from the 40-pin DIP form factor for prototype and through-hole assembly. The wide temperature range also makes it suitable for outdoor and automotive environments. When designing with this part, ensure the power supply decoupling follows Microchip's recommended layout: 0.1 uF ceramic capacitors placed within 5 mm of each VDD/VSS pair, plus a 10 uF bulk capacitor on the main rail. The MCLR pin must use the recommended RC reset network (typically 10 kohm pull-up to VDD with a 0.1 uF to ground) to guarantee a clean POR. This page synthesizes distributor pricing, drop-in PIC18C/PIC18F alternatives, and practical design notes not found in the manufacturer datasheet. Pricing and inventory are quoted as of 2026-09-26.

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PIC18C442-I/P - 8-bit OTP MCU, 16KB, 40MHz, 40-PDIP | Microchip
PIC18C442-I/P

PIC18C442-I/P - 8-bit OTP MCU, 16KB, 40MHz, 40-PDIP | Microchip

The Microchip Technology PIC18C442-I/P is an 8-bit One-Time Programmable (OTP) CMOS microcontroller from the PIC18Cxx2 family, delivering 10 MIPS performance (100 ns instruction execution) at 40 MHz core speed. Housed in a 40-pin PDIP (0.600", 15.24 mm) through-hole package, it integrates 16 KB of OTP program memory (8K x 16 words), 512 bytes of RAM, and 33 digital I/O pins. The device retains Microchip's powerful PIC RISC architecture with only 77 single-word instructions, simplifying firmware development. A microcontroller (MCU) is a single-chip computer that contains a processor core, program memory, data memory, and configurable peripherals. The PIC18C family occupies the high-performance tier of Microchip's 8-bit MCU portfolio, positioned above the PIC16F baseline and below the dsPIC and PIC32 32-bit families in the broader embedded hierarchy (8-bit MCU -> microcontroller -> embedded controller -> semiconductor). This part belongs to the legacy PIC18C OTP generation, which Microchip has since replaced with flash-based PIC18F devices (PIC18F442 is the recommended modern replacement per Microchip's product page). Key features include a 10-bit analog-to-digital converter (ADC), a Master SSP (MSSP) peripheral, multiple timers, and an external oscillator interface. The OTP memory enables factory or low-volume programming, suitable for cost-sensitive production runs. The 40-pin PDIP package supports breadboard prototyping and through-hole assembly, which remains popular for legacy industrial controls, educational kits, and field-service replacements. The PIC18C442-I/P employs Microchip's enhanced PIC18 Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and operand access. The 8-bit data path and 16-bit instruction word provide a favorable code density / performance trade-off for control-oriented tasks. Operating from 4.2 V to 5.5 V, the device includes brown-out reset, power-on reset, and a watchdog timer for robust field deployment. Typical applications include industrial control systems, appliance controllers, automotive subsystems (non-safety), HVAC controls, and educational development platforms. The OTP memory makes it well suited for high-volume production where firmware is fixed at manufacture, while the 33 I/O pins comfortably drive keypads, displays, and sensor interfaces. When designing with this part, note that the PIC18C442 has reached end-of-life; Microchip recommends migrating to the pin-compatible flash-based PIC18F442. Designers should verify long-term supply availability before committing to new designs, since the OTP variant is no longer recommended for new product introduction. This page synthesizes distributor inventory, drop-in flash alternatives, and engineering guidance that go beyond the manufacturer datasheet, including a same-package replacement matrix to ease migration to flash memory.

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PIC18C452-E/L - 8-bit OTP MCU, 32KB, 40MHz, 44-PLCC | Microchip
PIC18C452-E/L

PIC18C452-E/L - 8-bit OTP MCU, 32KB, 40MHz, 44-PLCC | Microchip

The Microchip Technology PIC18C452-E/L is a high-performance 8-bit CMOS OTP-based microcontroller built on the PIC18 RISC architecture, delivering 10 MIPS (100 ns instruction execution) at a 40 MHz clock in a 44-pin PLCC (J-Lead) package. It integrates 32 KB of One-Time Programmable (OTP) program memory organized as 16K x 16, 1536 bytes of RAM, 33 digital I/O pins, and an on-chip 10-bit analog-to-digital converter. An 8-bit microcontroller (MCU) is a programmable single-chip computer that combines a CPU, program memory, RAM, and peripherals on a single die. The PIC18 family specifically refers to Microchip's enhanced mid-range 8-bit architecture, the evolutionary successor to the PIC16 baseline, distinguished by 16-bit-wide instructions, an 8-bit-wide data path, a single-cycle hardware multiplier, and prioritized interrupts. The PIC18C452 belongs to the PIC18C OTP sub-family, sitting between the original PIC17 high-performance line and the later flash-based PIC18F series. The PIC18C452 is now obsolete and Microchip recommends migrating to the PIC18F452 flash-based counterpart. Key specifications include a 40 MHz maximum operating frequency, 77 single-word instructions, and a wide 2.0V to 5.5V supply range that makes the part suitable for both 3.3V and 5V designs. The integrated 10-bit A/D converter with multiple channels supports direct sensor interfacing, while the Master SSP (MSSP) module enables SPI and I2C communication. Note: per Microchip errata documentation, early PIC18C452 silicon exhibits anomalous behavior in the MSSP module that engineers must accommodate in firmware. The PIC18C452 uses a Harvard RISC architecture with a 21-bit program counter and 31-level hardware stack, allowing efficient C and assembly development. The OTP memory provides one-time programmability at lower cost than flash, which made the PIC18C family popular in cost-sensitive high-volume production where firmware is finalized. Typical applications include industrial control, automotive body electronics, appliance control, and embedded sensor systems where the integrated 10-bit ADC and 33 I/O pins allow direct connection to switches, relays, sensors, and human-machine interfaces. The wide voltage range and 40 MHz throughput also support motor control and HVAC subsystems. When designing with this part, verify the MSSP errata against your firmware; consider migrating to PIC18F452 if supply or long-term support is required. The PIC18C452-E/L ships in tube packaging and is supplied via quote-only distribution rather than real-time stock listings. This page synthesizes distributor pricing, drop-in alternatives including the PIC18F452 migration path, and practical design notes regarding the MSSP errata not found in the manufacturer datasheet summary.

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PIC18C452-I/L - 8-bit 40MHz 32KB OTP MCU 44-PLCC | Microchip
PIC18C452-I/L

PIC18C452-I/L - 8-bit 40MHz 32KB OTP MCU 44-PLCC | Microchip

The Microchip Technology PIC18C452-I/L is an 8-bit RISC CMOS one-time programmable (OTP) microcontroller delivering up to 10 MIPS of processing power from a 40MHz oscillator, packaged in a 44-pin PLCC (J-Lead, 16.59x16.59 mm) form factor. It integrates 32KB of program memory (16K x 16 words), 1.5KB of RAM, and 33 digital I/O pins, with an industrial operating temperature range (-40C to +85C) and a single 5V supply rail. A microcontroller (MCU) is a single-chip computer containing a processor core, non-volatile program memory, working RAM, and peripheral subsystems such as timers, capture/compare, ADC, and communication ports. The PIC18 family advances Microchip's PIC architecture with a 16-bit instruction word, an 8-bit data path, a hardware multiplier, and an extended register set, sitting between the legacy PIC16 and the higher-end PIC17 families in the company taxonomy. The PIC18C452 specifically is the 44-pin member of the OTP PIC18C generation, with sibling parts (PIC18C242/PIC18C252/PIC18C442) addressing 28- and 40-pin sockets. Key features include 77 single-word instructions (most single-cycle, 100 ns at 40 MHz), a programmable 16-level hardware stack, a vectored interrupt controller with 17 sources, an enhanced USART, MSSP (SPI/I2C), CCP modules, an 8-channel 10-bit ADC, and four timer/counters. The wide operating voltage and robust interrupt structure are signature strengths of the PIC18C generation, enabling deterministic real-time control with minimal software overhead. The PIC18C452 implements Microchip's classic Harvard RISC architecture with separate program and data buses, an arithmetic logic unit with hardware multiply, and a peripheral set designed for embedded control. The 32KB OTP program memory allows prototyping and low-volume production without external ROM, while the 1.5KB RAM buffer supports table lookups, stack frames, and protocol stacks such as UART command parsers. Typical applications include industrial control panels, HVAC thermostat boards, motor-control signal conditioning, instrumentation front-ends, and legacy embedded systems requiring five-volt logic with PLCC socket compatibility. Modern replacements such as PIC18F452 or PIC18F458 in the same PLCC-44 footprint are recommended for new designs because the PIC18C452 is in the PIC18C generation, which Microchip indicates is mature and recommends newer devices for new development. When designing with this device, ensure the OTP window is sealed for production code, plan code size around the 32KB ceiling, and verify the I/O drive current budget across all 33 pins. Engineers should note that Microchip's product page explicitly recommends PIC18F452 as the newer alternative, so the PIC18C452-I/L is best suited to legacy maintenance and exact-replacement scenarios rather than greenfield designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including a vetted list of same-footprint PIC18F parts suitable for direct PCB replacement.

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PIC18C452/JW - 8-Bit 40MHz 32KB EPROM MCU | Microchip
PIC18C452/JW

PIC18C452/JW - 8-Bit 40MHz 32KB EPROM MCU | Microchip

The Microchip Technology PIC18C452/JW is an 8-bit CMOS microcontroller from the PIC® 18C family, integrating a 32KB (16K x 16) UV-erasable EPROM program memory, 1.5KB of RAM, and 34 digital I/O pins in a 40-pin CERDIP windowed package. It executes instructions at up to 10 MIPS from a 40MHz oscillator input, supports single-cycle hardware multiply, and includes a 10-bit multi-channel analog-to-digital converter. Connectivity peripherals comprise one USART, one SPI, and one I²C (Master/Slave) interface, plus two 8-bit and three 16-bit timer/counters, dual analog comparators, and a Capture/Compare/PWM (CCP) module. The /JW suffix denotes the CERDIP package with a quartz window for UV erasure, intended for prototyping and development. A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory, working RAM, and peripheral interfaces into one device. PIC microcontrollers (Peripheral Interface Controllers) use a Harvard RISC architecture with separate program and data buses, enabling single-cycle instruction execution. The PIC18 family extends PIC16 compatibility with a 16-bit instruction word, hardware multiply, and 16-bit data paths, positioning PIC18C parts as the high-performance tier before the PIC18F flash-based successors superseded them. The PIC18C452/JW key features include 32KB program, 1.5KB RAM, 256 bytes of EEPROM data, 34 I/O, 10-bit 8-channel ADC, USART/SPI/I²C, dual analog comparators, two PWM channels, programmable brown-out reset, and a wide 2.0V–5.5V operating range with four oscillator modes (LP, XT, HS, RC). Compared with PIC16 8-bit predecessors it offers a 16-bit instruction word, hardware multiplier (single-cycle 8×8), larger linear code space, and a richer interrupt structure. The architecture uses 77 single-word instructions and a 16-level deep hardware stack, with vectored interrupts and an enhanced peripheral set. The C-compiler friendly instruction set and 16-bit-wide program bus deliver deterministic performance, making the PIC18C452/JW suited to real-time control. Typical applications include industrial control prototyping, motor control, instrumentation with ADC front-ends, embedded serial comms bridges, and educational development kits where the UV window enables rapid code iteration. The device is also used as a reference design platform for migrating legacy PIC18C code to modern flash PIC18F devices. When designing with this device, evaluate whether a flash-based PIC18F452 is preferable for production: PIC18F parts are reprogrammable in-circuit, removing the UV-erasure workflow required by the PIC18C452/JW CERDIP. This page synthesizes distributor pricing, parametric comparison, and practical substitution guidance not found in the manufacturer datasheet, including same-package and cross-package drop-in guidance for both legacy and modern Microchip alternatives.

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PIC18C452T-E/L - 32KB OTP 8-bit MCU, 44-PLCC | Microchip
PIC18C452T-E/L

PIC18C452T-E/L - 32KB OTP 8-bit MCU, 44-PLCC | Microchip

The Microchip Technology PIC18C452T-E/L is a high-performance 8-bit CMOS OTP microcontroller built on the PIC18C RISC architecture, delivering up to 10 MIPS of processing power with 100 ns instruction cycle time. The device integrates 32 KB of OTP program memory (16K x 16), 1.5 KB of general-purpose RAM, 256 bytes of EEPROM data memory, and 33 digital I/O pins in a 44-pin PLCC (J-Lead) package. What is an 8-bit OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a microcontroller whose program memory is implemented as one-time-writable non-volatile storage - the bit cells can be written once by the user but cannot be erased electrically. This positions the PIC18C452 in the broader hierarchy of microcontrollers -> 8-bit MCUs -> OTP MCUs -> embedded controllers. Compared to flash-based MCUs, OTP parts offer lower per-unit cost in high-volume production and slightly smaller die area, while still preserving the same instruction set and peripheral set across the family. Key features of the PIC18C452T-E/L include 10 MIPS throughput at 40 MHz, a 10-bit successive-approximation ADC with up to 8 input channels, a Master SSP (MSSP) module supporting SPI and I2C, a USART with addressable RX/TX buffering, two CCP modules, and an 8-bit parallel slave port (PSP). The device operates across an industrial temperature range of -40C to +125C and supports 2.0 V to 5.5 V supply. The enhanced (E) silicon variant provides wider Vdd and temperature tolerances than the baseline part. Architecturally, the PIC18C452 uses a 16-bit instruction / 8-bit data Harvard architecture with 77 single-word instructions, single-cycle hardware multiplier, and a 32-level deep hardware stack. The CPU fetches a 16-bit instruction in one cycle and operates on 8-bit data via 12 special-function and 11 general-purpose register file banks. Two 8-bit timers and three 16-bit timers provide flexible capture, compare, and PWM event management. Typical applications include industrial control panels, motor drive front-ends, instrumentation data logging, sensor signal conditioning, and embedded control blocks where the -E/L extended-temperature range and OTP cost model are required. The PIC18C452 is one of the original PIC18 family members; PIC18F452 flash variants are now the mainstream upgrade path with the same peripheral set, so many legacy designs are migrating footprints via drop-in compatible flash siblings. When designing with this device, verify the supply decoupling network: place a 0.1 uF ceramic close to each Vdd/Vss pair and bulk capacitance on the analog supply AVdd/AVss pins. The MSSP module has a known silicon errata that must be reviewed before production commit. This page synthesizes distributor pricing, drop-in alternative candidates, and practical design notes drawn from the verified Microchip datasheet - information not aggregated in the datasheet alone.

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PIC18C452T-E/PT - 8-Bit MCU 32KB EPROM 5V TQFP-44 | Microchip
PIC18C452T-E/PT

PIC18C452T-E/PT - 8-Bit MCU 32KB EPROM 5V TQFP-44 | Microchip

The Microchip PIC18C452T-E/PT is an 8-bit RISC microcontroller with 32KB of one-time-programmable (OTP) EPROM program memory housed in a 44-pin TQFP (PT) package. It belongs to the PIC18C family and operates from a 5V supply, delivering up to 10 MIPS performance from a 40 MHz oscillator input through its 16-bit instruction word and 8-bit data path architecture. An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, program memory, data RAM, and integrated peripherals such as timers, ADC, communication interfaces, and I/O ports. The PIC18C family sits within Microchip's high-performance 8-bit portfolio, optimized for embedded control where deterministic instruction timing, low part cost, and rich peripheral integration outweigh the throughput of 16-bit or 32-bit cores. Key features include 1536 bytes of data RAM, 34 digital I/O pins, a 10-bit multi-channel analog-to-digital converter (ADC), two Capture/Compare/PWM (CCP) modules, three external interrupt pins, four timers (Timer0 8/16-bit, Timer1 16-bit, Timer2 8-bit, Timer3 16-bit), a hardware single-cycle multiplier, and a Parallel Slave Port (PSP). The device supports in-circuit serial programming (ICSP) and is qualified to the extended automotive temperature grade (-40°C to +125°C). Architecturally, the PIC18C452 uses an enhanced Harvard bus architecture with separate program and data paths, enabling simultaneous instruction fetch and operand access. The hardware multiplier completes 8-bit x 8-bit operations in a single cycle, accelerating digital filter math, PID loops, and CRC-style routines common in motor-control and instrumentation firmware. Typical applications include industrial control systems, automotive body and powertrain subsystems, instrumentation front-ends with ADC-based sensor acquisition, and embedded control boards replacing discrete logic with a programmable solution. The wide I/O count makes it suitable as a host MCU for human-machine interface (HMI) boards and small appliances. When designing with this device, note that OTP memory prevents firmware field updates; for production runs requiring firmware revision flexibility, consider the pin-compatible PIC18F452 flash variant. Decoupling the 5V rail with 100 nF ceramic capacitors placed within 5 mm of each supply pin minimizes switching noise on the internal analog sections. This page synthesizes distributor pricing, drop-in-compatible alternatives, and practical design notes for the PIC18C452T-E/PT that are not found in a single manufacturer datasheet, accelerating your sourcing and design decisions.

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PIC18C452T-I/L - 8-Bit PIC18 MCU 32KB OTP 40MHz | Microchip
PIC18C452T-I/L

PIC18C452T-I/L - 8-Bit PIC18 MCU 32KB OTP 40MHz | Microchip

The Microchip Technology PIC18C452T-I/L is a high-performance 8-bit CMOS microcontroller from the PIC18C family, offering 32KB (16K x 16) of one-time programmable (OTP) program memory, 1.5KB of RAM, and 40 MHz / 10 MIPS operation in a 44-pin PLCC (J-Lead) package. Industrial temperature range is -40C to +85C. The device integrates a 10-bit multi-channel ADC, hardware multiply, and 34 digital I/O pins. An 8-bit microcontroller (MCU) is a small computer-on-a-chip built around an 8-bit data path. Within the broader product taxonomy, an 8-bit MCU sits below 16-bit and 32-bit microcontrollers in processing power but offers the lowest cost, simplest programming model, and lowest power consumption for embedded control. The PIC18 family specifically extends the legacy PIC16 instruction set to 16-bit wide opcodes with 8-bit data, providing C-friendly architecture and up to 10 MIPS performance while retaining RISC simplicity (77 single-word instructions). Key differentiating features of the PIC18C452T-I/L include 32KB of OTP program memory (16K x 16 organization), 1.5KB of general-purpose RAM, 256 bytes of EEPROM data memory, 34 bidirectional I/O pins, and a 10-bit successive-approximation ADC with up to 8 input channels. Other on-chip peripherals include two 8-bit timers, three 16-bit timers, two capture/compare/PWM (CCP) modules, an enhanced USART, an MSSP (SPI / I2C master-slave) port, a parallel slave port, and a single-cycle hardware 8x8 multiplier. The architecture implements a Harvard design with separate program and data buses, 16-bit instructions and 8-bit data path, an 8-level hardware stack, and prioritized interrupts. The PLL block allows operation from 4 MHz to 10 MHz oscillator sources while delivering 40 MHz internal execution, giving system designers flexibility in clock selection. The CMOS process provides low-power operation suitable for industrial and consumer embedded applications. Typical applications include industrial control systems, motor control, sensor interfaces, instrumentation, building automation, HVAC controllers, security and alarm panels, and automotive body electronics. The combination of OTP memory, ample RAM, and rich peripheral set makes the PIC18C452T-I/L a strong fit for medium-complexity embedded designs requiring moderate code size and deterministic real-time response. When designing with this part, note that OTP memory can be programmed only once; for prototyping or field-updatable designs choose the flash-based PIC18F452 equivalent. The PLCC-44 package is legacy through-hole J-lead; modern designs often migrate to the PIC18F452 in PLCC-44 or 40-pin PDIP, or to surface-mount TQFP/QFN variants. Ensure decoupling capacitors are placed close to VDD/VSS pairs per Microchip PIC18C452 datasheet recommendations. This page synthesizes distributor stock, pricing, drop-in PIC18C452 family alternatives, and practical design guidance beyond what is available in the Microchip datasheet alone.

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PIC18C452T-I/PT - 8-Bit 40MHz 32KB OTP MCU 44-TQFP | Microchip
PIC18C452T-I/PT

PIC18C452T-I/PT - 8-Bit 40MHz 32KB OTP MCU 44-TQFP | Microchip

The Microchip Technology PIC18C452T-I/PT is a member of the PIC18C family of high-performance 8-bit CMOS microcontrollers, delivering 10 MIPS throughput at 40 MHz with 32 KB (16K x 16) of One-Time Programmable (OTP) program memory and 1.5 KB of RAM in a 44-pin TQFP (10x10 mm) package. The 'T' suffix indicates Tape & Reel packaging and the 'I' suffix denotes the industrial -40C to +85C operating temperature range, while the device integrates 34 digital I/O pins, a 10-bit multi-channel Analog-to-Digital Converter (ADC), a Parallel Slave Port (PSP), and three serial communication peripherals (USART, SPI, I2C) plus two 8-bit and three 16-bit timers. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data memory, and programmable I/O peripherals. The PIC18C family extends the legacy PIC16 architecture with a 16-bit wide instruction word, 77 single-word instructions, a hardware multiplier, and an extended 16-level stack, positioning the part as an upgrade path for PIC16C5X, PIC12CXXX, PIC16CXX, and PIC17CXX designs while maintaining source-code compatibility at the architectural level. Key features include OTP program memory for fast prototyping and small-to-medium volume production, hardware USART for full-duplex asynchronous serial, Master Synchronous Serial Port (MSSP) supporting SPI and I2C, capture/compare/PWM (CCP) modules, a 10-bit ADC with up to 8 input channels, and a Parallel Slave Port for direct microprocessor bus attachment. The wide operating voltage range of 4.2 V to 5.5 V supports standard 5 V embedded designs. Typical applications include industrial control and automation, sensor interface boards, motor control front-ends, instrumentation and data acquisition, consumer appliances with display/keypad interfaces, and embedded communication gateways requiring USART plus SPI/I2C peripherals. The PSP allows the MCU to behave as a memory-mapped peripheral to an external host processor. Designers should plan OTP programming into the production flow (windowed JW package is required for code iteration), budget for the 1.5 KB RAM ceiling when selecting higher-protocol stacks, and use the ICD (In-Circuit Debug) variants PIC18C452-I/PT or PIC18F452-I/PT for development before committing to OTP volume. Pin-compatible Flash alternatives exist if field firmware update is required. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC18C601-I/PT - 8-bit 25MHz ROMless MCU 64-TQFP | Microchip
PIC18C601-I/PT

PIC18C601-I/PT - 8-bit 25MHz ROMless MCU 64-TQFP | Microchip

The Microchip Technology PIC18C601-I/PT is an 8-bit ROMless microcontroller from the PIC18C family, delivering 25 MHz (6.25 MIPS) CPU performance in a 64-pin TQFP (10x10 mm) package. It integrates 1.5 KB of RAM, an external memory bus capable of addressing up to 2 Mbytes of program memory, and 26 digital I/O pins for embedded system integration. According to the manufacturer datasheet, this part belongs to Microchip's High-Performance ROM-less Microcontrollers with External Memory Bus family. An 8-bit ROMless microcontroller is a CPU core that requires program code to be stored in an external memory device (EPROM, Flash, or SRAM) rather than internal non-volatile memory. In the broader system hierarchy it sits as an MCU (microcontroller) -> embedded processor -> integrated circuit, and is commonly selected for designs that need larger or more flexible program storage than on-chip flash parts can provide. Key features include a C-optimized RISC instruction set with only 77 single-word instructions, linear program memory addressing to 2 Mbytes, an external memory interface supporting both 16-bit and 8-bit bus widths, and a programmable oscillator range supporting external clock sources up to 40 MHz. The device also integrates a wide operating voltage range of 4.2V to 5.5V and an industrial temperature grade of -40C to +85C. Architecturally, the PIC18C601 uses a 16-bit instruction word with an 8-bit data path, a hardware multiplier, and a 31-level deep stack suitable for high-level language compilers. The external memory bus is configurable for separate address/data lines or multiplexed modes, making it adaptable to legacy external EPROM and modern parallel Flash parts. The lack of on-chip program memory reduces unit cost for high-volume applications and supports field-upgradable firmware via external memory swap. Typical applications include industrial control systems, automotive body electronics, point-of-sale terminals, and consumer appliances requiring external program memory. The wide external memory bus is also suited for legacy designs migrating from PIC16C5X/PIC12CXXX devices. The I suffix indicates the industrial temperature grade (-40C to +85C), and the PT suffix denotes the 64-pin TQFP surface-mount package. When designing with this part, allocate a minimum of 5 ns external memory access timing budget and place decoupling capacitors (100 nF ceramic plus 10 uF bulk) within 25 mm of the VDD pins. Designers should also confirm that external memory devices meet the 25 MHz (40 ns) cycle time at the chosen VDD level. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC18C601T-I/PT - 8-bit 25MHz ROM-less MCU, TQFP-64 | Microchip
PIC18C601T-I/PT

PIC18C601T-I/PT - 8-bit 25MHz ROM-less MCU, TQFP-64 | Microchip

The Microchip Technology PIC18C601T-I/PT is an 8-bit RISC ROM-less microcontroller in the PIC18 family, packaged in a 64-pin TQFP (10 mm x 10 mm, 1.0 mm height, MS-026) and supplied on Tape & Reel. The device runs at up to 25 MHz, features an external memory bus, and operates from a 5 V supply across the industrial -40C to +85C range, making it suitable for embedded control designs that need large off-chip program memory. What is a ROM-less microcontroller? A ROM-less microcontroller is an MCU variant that ships without on-chip non-volatile program memory, exposing an external memory bus so the firmware can reside in external parallel EPROM, Flash, or SRAM. This category sits within the broader PIC18 family hierarchy (PIC18 ROM-less -> PIC18 -> PIC microcontrollers -> 8-bit MCU -> microcontroller -> embedded processor) and is preferred when the application code exceeds internal Flash budgets, when the firmware must be field-upgradable, or when emulation/development requires swapping memory devices. Key features of the PIC18C601 include 1.5 KB (1536 bytes) of general-purpose RAM, 26 digital I/O pins, a hardware external memory bus capable of addressing up to 2 MB of external code space, and the standard PIC18 peripheral set (timers, USART, I2C/SPI, capture/compare/PWM, and 10-bit ADC channels). The part uses the enhanced PIC18 instruction set with 16-bit wide instructions and an 8-bit data path, achieving single-cycle execution for most instructions. Architecturally, the PIC18C601 integrates a 16-bit program counter with a 21-bit external addressing capability, an 8-level hardware stack, and a priority interrupt controller. Because the device has no internal program memory, every fetch is routed through the external bus controller, which adds deterministic latency and simplifies in-circuit emulation by substituting the external memory device with a debugger. Typical applications include industrial automation controllers, motor-drive front-end logic, large-state-machine instrumentation, and educational or development platforms where the external bus is leveraged for code visibility. It is also used in legacy 5 V-only designs where the original PIC18C601 has been qualified for production. When designing with the PIC18C601, plan the external memory interface (address latch, bus timing, wait states) and verify the 5 V-only I/O constraints against your sensor and bus levels; the part has no on-chip Flash and cannot boot from internal memory. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with citations to the verified Microchip datasheet.

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PIC18C658-E/L - 8-bit 32KB OTP MCU w/ CAN, 52 I/O | Microchip
PIC18C658-E/L

PIC18C658-E/L - 8-bit 32KB OTP MCU w/ CAN, 52 I/O | Microchip

The Microchip PIC18C658-E/L is an 8-bit high-performance RISC microcontroller with 32KB of One-Time Programmable (OTP) program memory, 1536 bytes of RAM, and an integrated CAN (Controller Area Network) module, packaged in a 68-pin PLCC (Leaded Chip Carrier) and operating from a 5V supply. It is built on Microchip's PIC18 architecture with C-compiler optimized instruction set, linear 32 Kbyte program-memory addressing and 4 Kbyte linear data-memory addressing, providing deterministic throughput for embedded control. What is a PIC18 microcontroller? The PIC18 family is a class of 8-bit Harvard-architecture microcontrollers from Microchip Technology, sitting hierarchically between the legacy PIC16 mid-range family and the 16-bit dsPIC/PIC24 families. PIC18 parts add a wider 16-bit instruction path, hardware multiplier, larger linear addressing space and richer peripherals while preserving the PIC16 programming model, making them the entry point for engineers needing CAN, USB, or larger memory footprints without moving to a 16-bit core. Key features include 40 MHz maximum operating frequency (10 MIPS), 12-channel 10-bit ADC, integrated CAN 2.0B peripheral, 52 digital I/O pins, PWM, watchdog timer, brown-out reset, low-voltage detect and power-on reset. The 'E' suffix denotes the -40C to +125C extended temperature grade suited to industrial and automotive under-hood environments. The 68-pin PLCC (J-Lead) package gives through-hole solderability and reliable socketed programming on legacy boards. The PIC18C658 is built on a baseline CMOS process and the architecture has been superseded by the flash-based PIC18F458 and PIC18F6585 families. Microchip's product page explicitly recommends the PIC18F6585 as the newer replacement. The OTP program memory cannot be re-programmed in-circuit, which is a key lifetime constraint for production designs. Typical applications include CAN-based industrial node controllers, automotive body and chassis ECUs, building-automation gateways, and legacy factory-floor PLC I/O modules. The combination of CAN peripheral, extended temperature range and 52 I/O pins covers typical CAN node requirements without external bus controllers. When designing with this part, note that OTP memory prevents firmware updates and the device is in Microchip's mature/legacy lifecycle; new designs should evaluate the PIC18F458, PIC18F6585 or dsPIC33E families. Use MPLAB IDE with MPASM or C18 compiler toolchain for firmware development.

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PIC18C658-E/PT - 8-Bit 40MHz 32KB OTP MCU with CAN | Microchip
PIC18C658-E/PT

PIC18C658-E/PT - 8-Bit 40MHz 32KB OTP MCU with CAN | Microchip

The Microchip Technology PIC18C658-E/PT is an 8-bit RISC PIC microcontroller from the PIC18C family, featuring an integrated CAN (Controller Area Network) module, 32KB of One-Time Programmable (OTP) program memory organized as 16K x 16 words, and a 40 MHz maximum operating frequency, all housed in a 64-pin TQFP (10x10 mm) package. According to the manufacturer datasheet, the device provides 4 Kbytes of linear data memory addressing, a C-compiler optimized architecture, and linear program memory addressing up to 32 Kbytes. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data RAM, and peripheral interfaces such as timers, ADC, communication ports, and I/O pins. The PIC18C family sits within Microchip's PIC18 high-performance 8-bit lineup, which uses a Harvard RISC architecture with separate program and data buses for single-cycle instruction execution. The PIC18C series was Microchip's early OTP variant of the PIC18 architecture, later superseded by the flash-based PIC18F series that added in-circuit reprogrammability. Key features of the PIC18C658-E/PT include the integrated CAN 2.0B peripheral, a 10-bit ADC with multiple channels, up to 33 I/O pins, an extended temperature grade of -40C to +125C (the "E" suffix indicates the Extended industrial temperature range), and flexible oscillator options supporting crystals, resonators, and external clock sources. The device operates from a 5V supply and includes multiple timers, a USART, MSSP for SPI/I2C, and a watchdog timer. The integrated CAN module makes the PIC18C658-E/PT particularly suited to automotive and industrial networking applications where distributed nodes communicate over a robust differential bus. The OTP program memory provides a low-cost solution for high-volume production where firmware is finalized and code changes are no longer required, while the 40 MHz clock delivers up to 10 MIPS of instruction throughput for real-time control loops. Typical applications include automotive body control modules, CAN nodes in industrial automation, embedded CAN-to-UART gateways, sensor interface modules, and HVAC controllers. The PIC18C658 has been recommended for replacement by the flash-based PIC18F6585, which offers pin-compatibility, in-system programmability, and an enhanced peripheral set for new designs.

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PIC18C658-I/PT - 8-bit 40MHz 32KB OTP MCU w/CAN | Microchip
PIC18C658-I/PT

PIC18C658-I/PT - 8-bit 40MHz 32KB OTP MCU w/CAN | Microchip

The Microchip Technology PIC18C658-I/PT is an 8-bit high-performance CMOS microcontroller from the PIC® 18C family, integrating a CAN 2.0B controller on-chip with 32KB (16K x 16) of One-Time-Programmable (OTP) program memory, 1536 bytes of RAM, and 52 digital I/O pins, all housed in a 64-pin TQFP (10x10 mm) package. What is an 8-bit OTP microcontroller? An OTP MCU is a microcontroller whose program memory can be written once during production programming, after which the code becomes permanent - similar to a masked-ROM device but with the flexibility of late-stage firmware customization. Within the broader taxonomy, this places PIC18C658 in the 8-bit MCU -> PIC microcontroller -> microcontroller -> embedded processing IC hierarchy. The integrated CAN module makes it specifically a "MCU with on-board communication peripheral," sitting at the intersection of general-purpose control and automotive/industrial networking silicon. Key differentiating features include a 40 MHz maximum clock speed (10 MIPS throughput), an enhanced 16-bit instruction set with 77 instructions, a 10-bit ADC, three timers, a USART, an MSSP (SPI/I2C) port, and the integrated CAN 2.0B module. The OTP memory suits low-volume production runs and field-programmable prototypes where mask-ROM tooling costs are prohibitive. The 64-pin TQFP package exposes enough I/O for human-interface panels, multi-drop sensor arrays, and CAN bus nodes. Architecturally, the PIC18C658 employs a Harvard architecture with separate program and data buses, an 8-bit ALU, and a hardware multiplier for single-cycle 8x8 operations. The integrated CAN engine handles full CAN 2.0B active frame transmission/reception with three transmit and two receive buffers, offloading the CPU from bit-level protocol work and enabling deterministic network behaviour. Typical applications include automotive body and chassis networks (CAN nodes for window/lights/seat modules), industrial CANopen/J1939 slave nodes, building automation (HVAC controllers, lighting gateways), embedded control with on-chip networking, and low-volume OEM instrumentation. The industrial temperature range (-40°C to +85°C, "I" suffix) supports factory-floor and automotive under-hood environments. When designing with PIC18C658-I/PT, ensure OTP programming is performed before final board assembly using a Microchip MPLAB PM3 or ICD2 programmer. Because OTP cannot be erased, firmware verification (read-back compare) is mandatory before bulk programming. For new designs, evaluate the flash-based PIC18F6585 as a more flexible alternative. This page consolidates distributor pricing, drop-in same-package alternatives, application-specific design notes, and parametric comparisons not aggregated on any single distributor page - an information-gain reference for engineers evaluating, sourcing, or replacing this legacy Microchip MCU.

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PIC18C658T-E/L - 40MHz 8-Bit MCU w/ CAN, 32KB OTP | Microchip
PIC18C658T-E/L

PIC18C658T-E/L - 40MHz 8-Bit MCU w/ CAN, 32KB OTP | Microchip

The Microchip Technology PIC18C658T-E/L is a high-performance 8-bit CMOS microcontroller from the PIC18C family, featuring an integrated CAN (Controller Area Network) module, 32KB of One-Time-Programmable (OTP) program memory and 4 Kbytes of linear data memory addressing. The device is offered in a 68-pin PLCC (Plastic Leaded Chip Carrier, J-Lead) package with body size 24.23x24.23 mm, operating from 4.2V to 5.5V at speeds up to 40 MHz. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces into one package. PIC microcontrollers from Microchip use a C-compiler-optimized RISC architecture with Harvard memory structure and linear program/data addressing. The PIC18C family is the high-end 8-bit line, suited to applications that need more code space, more peripherals, and faster execution than the PIC16F/PIC17C families - acting as a bridge to the later PIC18F flash-based line. Key specifications include 32KB (16K x 16) of OTP program memory, 4 Kbytes of data RAM, 40 MHz maximum clock, an on-chip CAN bus peripheral, multiple timers, ADC, USART and PWM peripherals. The automotive-grade "-E" temperature rating extends operation from -40C to +125C, while the "T" suffix denotes tape-and-reel packaging for high-volume assembly. Architecturally, the PIC18C658 employs an enhanced instruction set with 16-bit instructions and 8-bit data, supporting linear addressing to 32 Kbytes of program memory and 4 Kbytes of data memory. This enables efficient C compilation and large table lookups. The integrated CAN module complies with the CAN 2.0B specification, making the part suitable for automotive and industrial networked embedded systems where deterministic multi-node communication is required. Typical applications include automotive body and powertrain networked controllers, industrial CAN-bus nodes, building-automation gateways, embedded sensor hubs, and legacy industrial control replacements. The OTP memory makes it suited to mature, stable production designs where firmware does not require field updates, while the CAN peripheral simplifies hardware by eliminating an external standalone CAN controller. When designing with this part, note that OTP (not flash) memory means firmware is committed at the time of programming and cannot be rewritten in-circuit. Ensure your firmware is fully validated before OTP programming. The 68-pin PLCC package is socket-friendly, which simplifies prototyping and field service for legacy equipment. This page synthesizes the manufacturer's published OTP/CAN specifications, current distributor pricing, drop-in compatible alternatives, and practical design notes that the bare datasheet does not collect in one place, giving procurement and embedded engineers a single reference for the PIC18C658T-E/L.

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PIC18C658T-I/L - 8-Bit 40MHz 32KB OTP MCU w/ CAN | Microchip
PIC18C658T-I/L

PIC18C658T-I/L - 8-Bit 40MHz 32KB OTP MCU w/ CAN | Microchip

The Microchip PIC18C658T-I/L is an 8-bit high-performance RISC microcontroller from the PIC18C family, featuring 32KB (16K x 16) of One-Time Programmable (OTP) program memory, 1.5KB of general-purpose RAM, and an integrated CAN (Controller Area Network) module. The device operates at up to 40MHz (10 MIPS) from a 4.2V to 5.5V supply and is housed in a 68-pin PLCC (Plastic Leaded Chip Carrier) J-lead package, industrial temperature grade -40C to +85C. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data RAM, and integrated peripherals. PIC18C-series microcontrollers are positioned in Microchip's 8-bit hierarchy between PIC16 mid-range and PIC18 enhanced families, with the PIC18C line being the original OTP-programmed predecessor to the modern flash-based PIC18F devices. They are optimized for C-compiler code generation thanks to a linear 32KB program-memory addressing space and linear 4KB data-memory addressing, eliminating bank-switching overhead. Key features include 40MHz operation (100ns instruction cycle), hardware CAN 2.0B controller, USART, I2C, SPI, 8-channel 10-bit ADC, multiple 16-bit timers, and up to 16 MIPS throughput. The integrated CAN module eliminates the need for an external CAN controller, reducing BOM cost in automotive and industrial networked embedded systems. The 68-pin PLCC package provides 52 digital I/O pins plus dedicated peripheral and oscillator pins. Typical applications include industrial CAN-node controllers (CANopen, DeviceNet), automotive body electronics, building automation (BACnet, Modbus gateways), and embedded sensor networking. Compared with PIC18F flash parts, the PIC18C OTP variant is suited for volume production where firmware is finalized and a lower unit cost outweighs the field-upgradeability of flash memory. Design consideration: when migrating to PIC18F flash parts, verify peripheral register compatibility because some PIC18C peripheral modules differ in interrupt and configuration bit assignments from their PIC18F successors. Provide a 100nF decoupling capacitor close to each VDD/VSS pair, plus a 10uF bulk capacitor on the main 5V rail. This page synthesizes distributor pricing, drop-in alternative inventory, and practical design considerations not found in the manufacturer datasheet alone. Lifecycle status reflects current Microchip product discontinuation notices and authorized distributor inventory.

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PIC18C658T-I/PT - 8-Bit 40MHz 32KB OTP MCU 64-TQFP | Microchip
PIC18C658T-I/PT

PIC18C658T-I/PT - 8-Bit 40MHz 32KB OTP MCU 64-TQFP | Microchip

The Microchip Technology PIC18C658T-I/PT is an 8-bit RISC microcontroller from the PIC18C family, integrating 32KB of One-Time-Programmable (OTP) program memory organized as 16K x 16 words and operating at a maximum clock speed of 40 MHz. The part is supplied in a 64-pin TQFP (10 x 10 mm) surface-mount package with gull-wing leads and is specified for the industrial temperature grade (-40C to +85C). The "T" suffix indicates tape-and-reel packaging and the "I" suffix denotes industrial temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, RAM, non-volatile program memory, and peripheral interfaces on one die. Within the Microchip taxonomy, PIC18C devices sit above base PIC16 parts and below dsPIC enhanced parts: PIC18C family -> PIC18 8-bit MCU -> 8-bit microcontroller -> MCU -> semiconductor. PIC18C parts use an enhanced Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and operand access, which delivers roughly 4x the throughput of baseline PIC16 cores at the same clock. Key features of the PIC18C658T-I/PT include 32KB OTP program memory, 1.5K x 8 (1536 bytes) of general-purpose RAM, an industrial -40C to +85C operating range, 4.2V to 5.5V single-supply operation, and a maximum 40 MHz oscillator input. On-chip peripherals documented across the PIC18C6xx family include multiple timers, capture/compare/PWM (CCP) modules, an analog comparator, a 10-bit ADC on selected variants, USART, I2C/SPI, and a CAN module (the "6" family segment is the CAN-enabled branch). Architecture depth: the PIC18C core uses a 16-bit instruction word with 8-bit data path, 31-level hardware stack, and a multi-vector interrupt controller. The 32KB OTP is one-time programmable - suitable for low-to-mid volume production where firmware is final but device reprogrammability is not required; for engineering-friendly Flash variants see PIC18F658 or PIC18F858. Typical applications include industrial CAN-bus nodes, automotive body controllers, sensor signal conditioning, small appliance control, and embedded data acquisition. The 64-pin TQFP provides enough I/O for parallel buses and multiple serial channels. Design consideration: because OTP memory cannot be re-programmed in-circuit, ensure firmware is fully validated on a Flash-equivalent (PIC18F658) before committing to PIC18C658T-I/PT for production. Always de-couple VDD with a 100 nF ceramic plus 10 uF bulk within 5 mm of the supply pins. This page synthesizes distributor inventory, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC18C801-I/L - 25MHz ROMless 8-bit MCU, 84-PLCC | Microchip
PIC18C801-I/L

PIC18C801-I/L - 25MHz ROMless 8-bit MCU, 84-PLCC | Microchip

The Microchip Technology PIC18C801-I/L is a high-performance 8-bit ROMless microcontroller from the PIC18C family, delivering 6.25 MIPS (160 ns instruction execution) and an external memory bus capable of linear addressing up to 2 Mbytes of program memory and 4 Kbytes of data memory. Housed in an 84-pin PLCC (Plastic Leaded Chip Carrier, 29.31x29.31 mm, J-Lead) package, it provides 37 digital I/O lines and operates from a 2.0 V to 5.5 V supply with an external oscillator up to 25 MHz. A ROMless microcontroller is a CPU-centric variant of the PIC architecture that contains no on-chip program flash; instead, it fetches instructions from an external memory device attached to its parallel external memory bus. This makes ROMless PIC18C devices ideal for early-stage development, code-versioning scenarios, or applications that require larger program images than on-chip flash can accommodate. Within Microchip's taxonomy, the PIC18C801 sits under 8-bit microcontrollers -> PIC microcontrollers -> PIC18 family -> ROMless PIC18, and is targeted at embedded designs that need a flexible, upgrade-friendly program-memory architecture. Key features include a C-compiler-optimized instruction set with only 77 single-word instructions, multiple communication peripherals (USART, I2C/SPI), capture/compare/PWM modules, a 10-bit ADC, and a flexible external memory interface. The -I/L suffix indicates the industrial temperature grade (-40C to +85C) and the lead-free PLCC package option. The wide 2.0-5.5 V supply range supports both 3.3 V and 5 V system designs, simplifying integration into legacy industrial boards. The PIC18C801 architecture uses a 16-bit instruction word with a Harvard bus structure, an 8-bit data path, and a hardware multiplier for fast arithmetic. The external memory bus is multiplexed and can address program memory up to 2 Mbytes, enabling large code footprints or data logging buffers stored externally. Typical applications include industrial control systems, motor-control front-ends, instrumentation with external boot flash, prototype and pre-production designs, and legacy embedded systems that require code revision flexibility. Engineers frequently choose the PIC18C801 for low-risk development because firmware can be updated by swapping the external memory device rather than re-programming internal flash. When designing with this part, ensure the external memory bus is properly terminated, that the chosen external memory device meets the 25 MHz access-time budget, and that the industrial temperature grade is appropriate for the deployment environment. The 84-PLCC package uses a through-hole socket footprint, simplifying prototype rework and field replacement. This page synthesizes distributor inventory, drop-in 84-PLCC alternatives, and design considerations that go beyond the manufacturer datasheet, helping engineers source, evaluate, and design with the PIC18C801-I/L more efficiently.

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PIC18C801-I/PT - 8-bit ROMless MCU, 2MB External Bus, TQFP-80 | Microchip
PIC18C801-I/PT

PIC18C801-I/PT - 8-bit ROMless MCU, 2MB External Bus, TQFP-80 | Microchip

The Microchip Technology PIC18C801-I/PT is an 8-bit ROMless microcontroller based on the PIC18 Harvard RISC architecture, capable of 6.25 MIPS at 25 MHz instruction execution (160 ns per instruction), and packaged in an 80-pin TQFP (PT) surface-mount package. The device features external memory addressing up to 2 MB, 1.5 KB of on-chip RAM, and 37 digital I/O pins, with two capture/compare/PWM (CCP) modules, a 12-channel 10-bit ADC, and a synchronous serial port configurable as 3-wire SPI or 2-wire I2C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and a range of peripherals (timers, ADC, communication ports) into one package. Within the broader semiconductor taxonomy, the PIC18C801 sits at: microcontroller -> embedded microcontroller -> 8-bit RISC MCU -> semiconductor device. The 8-bit class remains widely deployed in cost-sensitive, deterministic-control applications where 32-bit performance is unnecessary and where the C-friendly PIC18 instruction set with only 77 single-word instructions reduces firmware complexity. Key features include operation from a 5V supply, an external oscillator interface, industrial temperature grade (-40C to +85C), and ROMless operation that lets the designer pair the MCU with external program memory (EPROM/Flash) for prototyping or low-volume manufacturing. The 12-channel 10-bit ADC supports sensor interfacing, while the two CCP modules provide PWM for motor control, lighting, and power-conversion feedback loops. The ROMless architecture is ideal for systems that require large external program storage, code-update flexibility, or where in-system reprogrammability is mandated. Typical applications include industrial automation controllers, motor-control boards, sensor-interface front ends, and educational/development platforms that emulate PIC18C601 behavior with larger code space. Designers also use this part for legacy industrial systems where firmware has been validated on the PIC18C601 and now needs additional code headroom. When designing with the PIC18C801, allocate a generous PCB footprint for the 80-pin TQFP and route the external memory bus with attention to signal integrity. The ROMless architecture adds latency on external fetches compared to flash-based PICs, so critical interrupt routines must be kept short. Use the CCP modules for time-critical control loops. This page synthesizes verified distributor pricing, drop-in compatible TQFP-80 alternatives, application examples, and design notes not consolidated in the manufacturer datasheet alone.

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PIC18C801T-I/L - 25MHz 8-Bit ROMless MCU 84-PLCC | Microchip
PIC18C801T-I/L

PIC18C801T-I/L - 25MHz 8-Bit ROMless MCU 84-PLCC | Microchip

The Microchip PIC18C801T-I/L is an 8-bit RISC microcontroller from the PIC18C family, supplied in an 84-pin PLCC (J-Lead, 29.31x29.31 mm) surface-mount package and offered on tape and reel. It is rated for industrial temperature operation from -40°C to +85°C and operates from a 4.2V to 5.5V supply. The CPU executes instructions at up to 25 MHz (10 MIPS) using an enhanced Harvard architecture and is delivered as a ROMless device, allowing external program memory expansion. Background: An 8-bit microcontroller (MCU) is a self-contained computing element that integrates a CPU, RAM, peripheral set, and interrupt controller on a single die. PIC18C-series MCUs sit in Microchip's high-performance 8-bit hierarchy: PIC10/12/16 baseline -> PIC17 mid-range -> PIC18 high-end (RISC, 16-bit instructions, hardware multiplier). The PIC18C family predates PIC18F flash parts and is ROMless, so program code is fetched from an external EPROM or flash memory over a parallel bus. The PIC18C801 is the highest-pin-count member of the family and is specifically designed for external-memory systems that need abundant I/O and large code spaces beyond what on-chip flash can hold. Key features of the PIC18C801T-I/L include 84 pins in the PLCC J-lead package, 25 MHz maximum clock, industrial -40°C to +85°C temperature range, ROMless external-memory interface, and compatibility with the PIC18C instruction set. Tape-and-reel packaging supports high-volume surface-mount assembly. The "T" suffix indicates tape and reel orientation, while "I" denotes the industrial temperature grade. The "/L" suffix denotes the PLCC J-lead package. Typical applications include industrial automation controllers, consumer electronics with external program memory, automotive body and chassis control modules, and embedded systems requiring large external code spaces. Engineers choose the PIC18C801T-I/L when on-chip flash is insufficient and an external memory bus is required. Design consideration: when migrating to modern alternatives, verify that the replacement exposes a compatible external-memory bus or implements an equivalent on-chip flash density, and confirm interrupt and peripheral register compatibility. PIC18C parts are now legacy; PIC18F or dsPIC33 families typically offer pin-compatible migration paths. Always consult the Microchip PIC18C801 errata sheet for known operational differences before committing to a new design.

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