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PIC17C43-25/P - 8-bit 25MHz OTP MCU 8KB | Microchip
PIC17C43-25/P

PIC17C43-25/P - 8-bit 25MHz OTP MCU 8KB | Microchip

The Microchip Technology PIC17C43-25/P is an 8-bit CMOS EPROM/ROM-based microcontroller in the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) with 58 single-word instructions. It integrates 8 KB (4K x 16) of OTP program memory, 454 bytes of RAM, and 33 digital I/O pins in a 40-pin PDIP through-hole package, clocked at up to 25 MHz from a 4.5 V to 6 V supply. The device targets applications needing more horsepower than the PIC16C family while remaining code-compatible with PIC16C5X, PIC12CXXX, and PIC16CXX predecessors. A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripherals. The PIC17C family occupies the high-performance tier of Microchip's 8-bit portfolio, above PIC12C/PIC16C baseline parts but below the PIC18 generation. This hierarchy (MCU -> 8-bit MCU -> PIC architecture -> PIC17C family) makes the PIC17C43 a bridge device for designs migrated from PIC16C that need higher throughput, more memory, or more I/O. Key features include 8 KB OTP program memory, 454 bytes of general-purpose RAM, 33 I/O pins with programmable direction, multiple timer/counter modules, a synchronous/asynchronous serial port (USART/SCI), and an 8-bit parallel slave port. The 25 MHz oscillator input yields 8.25 MIPS throughput, and the 16-bit instruction bus with Harvard architecture supports single-cycle execution for most opcodes. Brown-out reset and watchdog timer options are available via configuration bits. The PIC17C43-25/P uses Microchip's classic RISC PIC core with separate program and data buses, an 8-level hardware stack, and dual-ported RAM for fast context switching. The OTP memory (one-time programmable) is suited for low-to-medium production volumes where mask-ROM volumes are uneconomical, while the 25 MHz speed grade reflects the mid-range operating frequency tier within the PIC17C43 family. Typical applications include industrial control, motor control, instrumentation, automotive subsystems, and embedded control boards where higher computational throughput than PIC16C is required. The wide 4.5 V to 6 V supply range supports both regulated 5 V systems and battery-backed designs. Legacy replacement designs migrating to PIC18F parts often retain PIC17C43 firmware layouts. When designing with this part, ensure the OTP programming step is included in your manufacturing flow. For new designs, Microchip recommends PIC18F4220 (Flash-based, in-circuit programmable) as the modern replacement with broader tool support and active supply status. This page synthesizes distributor pricing, OTP vs Flash replacement guidance, and practical design notes not found in the manufacturer datasheet alone, helping engineers decide whether to stay with PIC17C43-25/P or migrate to PIC18F4220.

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PIC17C43-25/PT - 8.25 MIPS 8-bit OTP MCU, 8KB EPROM | Microchip
PIC17C43-25/PT

PIC17C43-25/PT - 8.25 MIPS 8-bit OTP MCU, 8KB EPROM | Microchip

The Microchip Technology PIC17C43-25/PT is a high-performance 8-bit CMOS EPROM/ROM-based microcontroller in the PIC17C family, delivering 8.25 MIPS (121 ns instruction cycle) at a 33 MHz clock input. The /PT suffix denotes a 44-pin TQFP surface-mount package rated for commercial temperature range (0C to +70C), with 8KB of on-chip EPROM program memory organized as 4K x 16 words. The device is supported by 454 bytes of general-purpose RAM, an 8-bit multiply instruction, and 58 single-word instructions with most executing in a single 121 ns cycle. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, ALU, registers, and on-chip program/data memory. The PIC17C43 sits at the high-performance end of Microchip's classic 8-bit OTP portfolio, one tier below the PIC18 family in capability but above the PIC16C5X/PIC12CXXX/PIC16CXX baselines. Program memory is OTP (one-time programmable) EPROM, placing this part in the 'high-performance 8-bit MCU' hypernym tree: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. Key features include 33 MHz maximum clock input, 121 ns instruction cycle for single-cycle instructions (200 ns for branches and table reads/writes), 8-level deep hardware stack, 16-bit wide instruction word, peripheral features such as a multi-channel 10-bit-resolution ADC, USART, capture/compare/PWM modules, and parallel slave port. Brown-out reset, watchdog timer, and code protection are standard. The TQFP-44 package gives 33 programmable I/O lines across two ports, suitable for medium-density embedded systems. Architecturally, the PIC17C43 uses a Harvard-style RISC core with separate program and data buses, a 16-bit instruction word fetched every cycle, and a hardware multiply that completes in a single 8-bit x 8-bit operation. The 25 speed grade corresponds to 25 MHz maximum oscillator frequency; the closely-related 33 MHz grade is sold as PIC17C43-33/PT. Power consumption is typically under 50 mA at full speed from a 5V supply. Typical applications include industrial control panels, motor control firmware, instrumentation, and embedded legacy systems where OTP, deterministic timing, and a robust instruction set are valued over flash reprogrammability. Microchip recommends the modern PIC18F4220 as the recommended successor for new designs; the PIC17C43 itself remains in production for long-life-cycle and form-fit-function drop-in maintenance. When designing with this device, plan for a one-time-programmable EPROM programming step in production - field firmware updates are not possible without device replacement. Ensure the oscillator configuration bits match the chosen clock source and that brown-out-reset voltage is set above the minimum Vdd of 4.5V required for EPROM operation. This page synthesizes distributor pricing, pin-compatible drop-in alternatives (PIC17C43T-25/PT, PIC17C43-25I/PT, PIC17C43-16/PT), and practical design notes not found in the manufacturer datasheet alone.

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PIC17C43-25E/L - 8-bit 25MHz OTP MCU 8KB | Microchip
PIC17C43-25E/L

PIC17C43-25E/L - 8-bit 25MHz OTP MCU 8KB | Microchip

The Microchip Technology PIC17C43-25E/L is an 8-bit CMOS OTP-based microcontroller in the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) with up to 25 MHz clock speed. It integrates 8 KB (4K x 16) of One-Time-Programmable (OTP) program memory and 454 bytes of general-purpose RAM, packed into a 44-pin PLCC (16.59 mm x 16.59 mm) leaded chip-carrier package and supplied in tube packaging. The 'E' suffix denotes the extended (industrial) temperature range, making this part suitable for harsh-environment embedded applications. A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory (ROM/Flash/OTP), volatile data memory (RAM), and integrated peripherals such as timers, communication controllers, and I/O ports. The PIC17C family sits above the entry-level PIC16C5X in Microchip's 8-bit roadmap and is upward-compatible with PIC12CXXX, PIC16CXX, and PIC16C5X instruction subsets. The PIC17C43 specifically belongs to the original PIC17C4X product line of high-pin-count, performance-oriented 8-bit controllers targeting motor control, instrumentation, and industrial automation subsystems. Key features of the PIC17C43 include a Harvard RISC architecture with only 58 single-word instructions, hardware multiply and divide support, a Watchdog Timer (WDT) with on-chip RC oscillator, Power-On Reset (POR), brown-out detection, an 8-bit Timer0 with external event counter, multi-channel Capture/Compare/PWM (CCP) peripherals, a Universal Synchronous/Asynchronous Receiver/Transmitter (USART) for serial communication, and parallel slave port functionality. The 33 digital I/O pins share package pins with peripheral functions and analog comparator inputs. The PIC17C43 architecture combines a 16-bit-wide instruction word with an 8-bit datapath, giving 14-bit program-word addressing plus enhanced byte-handling efficiency over the PIC16C series. On-chip peripherals are individually enabled through register bits, allowing unused peripherals to remain inactive to conserve supply current. The PIC17C43 was later superseded by the flash-based PIC18F family, with Microchip explicitly recommending PIC18F4220 as the migration target for new designs and legacy OTP support. Per the verified product page, Microchip's official position is that 'a newer device is available. Please consider PIC18F4220.' Typical applications include industrial motor control drives, HVAC controllers, instrument panels, security alarm panels, smart sensor nodes, and embedded control boards requiring 33+ general-purpose I/Os. The extended temperature range extends operating capability into factory and outdoor cabinet installations. The PLCC-44 surface-mount package with J-leads is also friendly to socketed prototyping and field replacement. When designing in this part, note that OTP memory cannot be re-programmed, so firmware should be finalized before committing to the silicon. Designers should validate code in a windowed (JW-package) PIC17C43 or in the recommended PIC18F4220 successor before production mask orders. Always confirm availability with the franchised distributor because Microchip has issued end-of-life notifications for several PIC17C43 speed grades. This page synthesizes current distributor inventory, same-package drop-in alternatives (PIC17C43 speed grades and PIC17C42A variants), the Microchip-recommended PIC18F4220 migration target, and practical design notes not duplicated on the manufacturer datasheet.

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PIC17C43-25E/PT - 8-bit 25MHz OTP MCU 8KB | Microchip | TQFP-44
PIC17C43-25E/PT

PIC17C43-25E/PT - 8-bit 25MHz OTP MCU 8KB | Microchip | TQFP-44

The Microchip Technology PIC17C43-25E/PT is an 8-bit CMOS OTP-based microcontroller delivering 8.25 MIPS (121 ns instruction execution) at 25 MHz, packaged in a 44-pin TQFP (PT). It integrates 8 KB of One-Time-Programmable (OTP) program memory organized as 4K x 16 words, 454 bytes of general-purpose RAM, and 33 digital I/O pins. The core is upwards compatible with the PIC16C5X, PIC12CXXX, and PIC16CXX instruction families and exposes only 58 single-word instructions, keeping the assembly learning curve shallow. An 8-bit microcontroller is a single-chip computer built around an 8-bit data path, ALU, register file, on-chip memory, and integrated peripherals. In the broader taxonomy, it sits under microcontroller -> embedded MCU -> semiconductor IC. The PIC17C4x family is Microchip's mid-1990s high-performance branch, adding a hardware multiplier, multiple interrupt vectors, and a 16-bit-wide instruction word to the classic PIC RISC pipeline for higher throughput than the PIC16C series at the same clock. Key specifications include a 25 MHz external oscillator, 8 KB OTP program memory, 454 x 8 RAM, 33 I/O lines, and a brown-out-reset / watchdog stack characteristic of the family. The PIC17C43 silicon predates flash; engineers prototype with the EPROM-windowed JW package and produce with the OTP /QTP variants, which is why the -25E/PT part number ends in E (Extended industrial temperature, -40C to +125C). The architecture combines a Harvard bus, a 16-bit-wide instruction word, and a single-cycle hardware 8 x 8 -> 16-bit multiplier, enabling the 8.25 MIPS throughput at 25 MHz. Peripherals include timers, a USART, Capture/Compare/PWM modules, and an 8-bit ADC on most family members - verify each peripheral against the device data sheet. Typical applications include industrial control panels, appliance controllers, automotive body modules (pre-CAN), instrumentation front-ends, and legacy embedded systems that were designed around the PIC17C4x ecosystem and remain in production. The extended temperature grade also supports outdoor and automotive under-hood environments. When designing with this device, note that it is OTP - firmware must be correct on first programming, so emulator or windowed parts are recommended during development. Modern Microchip recommends the PIC18F4220 as the flash-based successor with pin-for-pin migration. This page synthesizes distributor pricing, drop-in alternatives, and design notes not always present in the manufacturer datasheet.

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PIC17C43-25I/P - 8-Bit 25MHz OTP MCU, 8KB, 40-PDIP | Microchip
PIC17C43-25I/P

PIC17C43-25I/P - 8-Bit 25MHz OTP MCU, 8KB, 40-PDIP | Microchip

The Microchip Technology PIC17C43-25I/P is a high-performance 8-bit CMOS OTP-based microcontroller in the PIC17C family, featuring 8KB of One-Time-Programmable (OTP) program memory and 454 bytes of RAM, operating at up to 25MHz (40ns instruction cycle, 8.25 MIPS peak throughput). It is housed in a 40-pin PDIP (Plastic DIP) through-hole package with 33 I/O lines, integrating Power-On Reset (POR), Brown-Out Reset (BOR), Watchdog Timer (WDT), PWM module, USART, and a 10-bit multi-channel A/D converter. What is a PIC microcontroller? A PIC (Peripheral Interface Controller) microcontroller is a RISC-based, Harvard-architecture 8/16/32-bit single-chip computer integrating CPU, program memory (ROM/EPROM/Flash/OTP), data RAM, EEPROM, timers, ADC/DAC, and communication peripherals on one IC. PIC17C specifically sits at the top of the original 8-bit PIC hierarchy (PIC16 -> PIC17 -> PIC18) as Microchip's first 8-bit family with a 16-bit-wide instruction word, expanded register set, hardware multiplier, and DC-40MHz operation. PIC17C43-25I/P belongs to this family as the 25MHz industrial-grade (I-suffix) -40C to +85C variant. Key features include 8.25 MIPS sustained performance (only 58 single-word instructions), 16-level hardware stack, 8 x 8 hardware multiplier (single-cycle), 33 digital I/O pins, three timer/counter modules, dual analog comparators, and a USART with 9-bit address detect. The 10-bit ADC supports up to 12 input channels, and the PWM module provides configurable duty/frequency control suitable for motor and lighting control. OTP memory allows one-time field programming, suiting low-to-mid volume production. The device uses a 2.5V to 6.0V single-supply operating range, consumes <5mA active at 25MHz @ 5V, and includes power-saving SLEEP mode with <1uA typical standby current. The PIC17C architecture offers RISC-like deterministic execution and is upwards compatible with PIC16C5X/PIC16CXX code, easing code migration. The wide instruction word and register-rich core outperform PIC16C while remaining 8-bit-compatible at the C source level for many peripherals. Typical applications include industrial control, motor control (PWM + ADC feedback loop), instrumentation front-ends, automotive body/comfort ECUs (pre-CAN generations), embedded control of sensors and actuators, and legacy 5V-system replacements. Designers select PIC17C43-25I/P when they need >5 MIPS throughput, >2KB program memory, and a through-hole PDIP for prototyping or harsh-environment hand-soldered production. When designing with this device, ensure the OTP window is shielded from UV light (no windowed part), use a stable 25MHz crystal with the on-chip oscillator and appropriate load capacitors, and provide clean +5V decoupling within 2cm of VDD pins. The PIC17C43-25I/P is suitable for industrial temperature environments (-40C to +85C); for extended -40C to +125C automotive duty, evaluate PIC18F alternatives recommended by Microchip. This page synthesizes distributor pricing, parametric drop-in PIC17C alternatives, and practical PIC17C43 design notes not consolidated in the manufacturer datasheet alone.

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PIC17C43-25I/PT - 8-bit 25MHz OTP MCU, 8KB ROM, 44-TQFP | Microchip
PIC17C43-25I/PT

PIC17C43-25I/PT - 8-bit 25MHz OTP MCU, 8KB ROM, 44-TQFP | Microchip

The Microchip Technology PIC17C43-25I/PT is an 8-bit RISC CMOS OTP-based microcontroller delivering 8.25 MIPS (121 ns instruction execution) at 25 MHz, packaged in a 44-pin TQFP (PT) industrial-temperature grade form. It integrates 8 KB of OTP program memory, 454 bytes of general-purpose RAM, and 33 digital I/O pins, making it one of the highest-performance members of the legacy PIC17C family. The 'I' suffix denotes an industrial temperature range of -40 C to +85 C, while the '25' speed grade indicates a 25 MHz maximum clock frequency. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and peripheral interfaces such as timers, A/D converters, and communication ports. MCUs sit inside the broader taxonomy of embedded processors, alongside microprocessors (MPUs) and DSPs. The PIC17C43 family specifically uses Microchip's enhanced PIC architecture with a 16-bit instruction word, an 8-bit data path, and 58 single-word instructions, making it upwards-compatible with the PIC16C5X, PIC12CXXX, and PIC16CXX device families for code portability. Key features include 8 KB of OTP program memory (organized as 4 K x 16), 454 bytes of RAM, hardware multiply, a 16-level hardware stack, and on-chip peripherals such as multiple timers, a USART, and up to 33 I/O lines. The architecture supports Harvard-style separate program and data buses, enabling single-cycle instruction fetch and execution. The 44-pin TQFP (PT) package offers a compact 10x10 mm footprint suitable for surface-mount designs while still exposing the full peripheral complement. Typical applications include industrial control systems, legacy embedded designs, motor control interfaces, sensor monitoring nodes, and replacement of obsolete microcontrollers in long-lifecycle equipment. The 25 MHz throughput, combined with the 16-bit instruction word, provides roughly four times the code density of PIC16 devices and roughly double the execution speed at the same clock. When designing with this part, remember that OTP (one-time-programmable) memory cannot be re-flashed; development should use a JW-windowed or E-emulation variant, with the final production code burned into PIC17C43-25I/PT. The Microchip product page recommends considering PIC18F4220 as a newer Flash-based replacement for new designs. This page synthesizes distributor pricing, drop-in alternatives, and engineering design notes not found in the manufacturer datasheet, helping engineers evaluate the PIC17C43-25I/PT for both legacy maintenance and cross-reference applications.

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PIC17C43-33/L - 8-bit 33MHz OTP MCU 8KB 44-PLCC | Microchip
PIC17C43-33/L

PIC17C43-33/L - 8-bit 33MHz OTP MCU 8KB 44-PLCC | Microchip

The Microchip Technology PIC17C43-33/L is a high-performance 8-bit CMOS OTP microcontroller from the PIC17C family, operating at 33 MHz and delivering up to 8.25 MIPS of throughput with 121 ns instruction cycle time in a 44-pin PLCC package. The device integrates 8 KB of one-time-programmable program memory (4K x 16 words), 454 bytes of RAM, and 33 digital I/O pins across 4 ports (PORTA-PORTE), providing substantial code space and peripheral flexibility for embedded control designs. A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, I/O peripherals, and interrupt logic on one silicon die. The PIC17C family is Microchip's high-end 8-bit architecture, extending the PIC16C baseline with a wider 16-bit instruction word, an 8-level hardware stack, and a peripheral set tuned for instrumentation, motor control, and industrial automation. In the broader taxonomy, the PIC17C43 sits above PIC16C, PIC12C and PIC16F families but below the PIC18 and 16-bit dsPIC families, making it a transitional part for designs that have outgrown the PIC16 instruction budget but still need 8-bit cost efficiency. Key features include a capture/compare/PWM module, an 8-bit parallel slave port for external bus expansion, two 8-bit timers plus one 16-bit timer/watchdog, USART serial port, and a versatile 12-bit analog interface. Brown-out reset, power-on reset, and a watchdog timer provide robust field reliability. The OTP program memory supports one-time programming via a universal programmer, which is suitable for production runs where firmware is finalized. Typical applications include industrial process controllers, automotive body and instrument cluster modules, smart sensor front-ends, and legacy embedded platforms designed around the PIC17C instruction set. When selecting this part, verify your firmware programmer supports the PIC17C device family, since the PIC17C instruction set differs from the more common PIC16C/PIC16F families.

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PIC17C43-33/P - 8-Bit 33MHz OTP MCU 8KB | Microchip
PIC17C43-33/P

PIC17C43-33/P - 8-Bit 33MHz OTP MCU 8KB | Microchip

The Microchip Technology PIC17C43-33/P is an 8-bit CMOS EPROM/ROM-based microcontroller belonging to the PIC17C family, operating at 33 MHz and delivering 8.25 MIPS with a 121 ns instruction cycle. It integrates 8KB (4K x 16) of One-Time Programmable (OTP) program memory and 454 bytes of RAM, packaged in a 40-pin PDIP through-hole format (0.600 inch / 15.24 mm body width). The device is a member of an older legacy PIC architecture that Microchip is gradually transitioning away from in favor of newer PIC18F parts. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, on-chip program memory, RAM, and a set of I/O peripherals. The PIC17C43 sits within the broader taxonomy: PIC17C family -> PIC microcontroller family -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. Within Microchip's portfolio it preceded the PIC18F generation, which now supersedes PIC17C43 in new designs (Microchip's product page recommends PIC18F4220). The PIC17C43 nevertheless remains in distribution for legacy industrial, instrumentation, and telecom control designs where firmware revision-locks the platform. Key differentiating features include 33 I/O pins, three timer modules, a USART for serial communication, a Watchdog Timer, and an instruction set of 58 single-word instructions. The wide operating voltage range of 2.5V to 6.0V and an extended temperature range of -40C to +85C let this part serve commercial and industrial applications. The 40-pin PDIP (Plastic DIP) package supports hand prototyping and rework, attractive for low-volume production, educational kits, and field service replacements. Architecturally, the PIC17C43 combines a Harvard bus (separate program/data paths) with a RISC instruction set that executes one 16-bit instruction word per cycle. The OTP program memory suits mature firmware that does not require in-application re-programming, contrasting with modern Flash-based MCUs that allow iterative code updates. Brown-out Reset, Power-on Reset, and a programmable Watchdog Timer improve field reliability in unattended installations. Typical applications include industrial motor control loops, instrumentation front-ends, telecom equipment, point-of-sale terminals, and embedded control boards where PIC17C firmware already exists and qualification costs of migration are prohibitive. The 33 MHz clock rate and ~8 MIPS throughput comfortably drive UART protocols, simple PID loops, and human-machine interface scanning. When designing with PIC17C43-33/P, note that OTP memory requires windowless ceramic or one-time-only programming - choose this part only when firmware is fully validated. For new designs, Microchip recommends migrating to PIC18F4220 (Flash-based, pin-compatible in many 40-pin DIP layouts). Stock availability should be confirmed at order entry - legacy OTP supplies are increasingly constrained as Microchip discontinues PIC17C variants. This page synthesizes current distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC17C43-33/PQ - 33MHz 8-bit OTP MCU, 8KB, 33 I/O | Microchip
PIC17C43-33/PQ

PIC17C43-33/PQ - 33MHz 8-bit OTP MCU, 8KB, 33 I/O | Microchip

The Microchip PIC17C43-33/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, operating at up to 33 MHz with a 121 ns single-cycle instruction execution time (except program branches and table reads/writes which take two cycles). The device delivers 8.25 MIPS of throughput and integrates 8 KB (4K x 16) of One-Time-Programmable (OTP) program memory alongside 454 bytes of general-purpose RAM, packaged in a 44-pin MQFP (PQ) plastic quad flat pack. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and programmable I/O peripherals on one die. The PIC17C43 belongs to the broader PIC (Peripheral Interface Controller) family, which sits within the 8-bit microcontrollers product hierarchy (8-bit MCU -> microcontroller -> embedded IC -> semiconductor). The PIC17C sub-family was Microchip's first architecture to exceed 5 MIPS and added a hardware multiplier and 16-bit-wide opcode fetch, while remaining code-compatible with the PIC16C5X, PIC12CXXX and PIC16CXX instruction sets for design portability. Key features of the PIC17C43-33/PQ include 33 general-purpose I/O lines, an internal 8-bit data bus, two 8-bit timer/counters, a USART, multiple interrupt sources, and a Watchdog Timer for reliable embedded operation. The 33 MHz clock input delivers 121 ns instruction cycle times, allowing deterministic control-loop execution. OTP program memory is programmed via standard Microchip device programmers, making the part suitable for low-volume production and field updates. The PIC17C43 architecture uses a RISC-style Harvard bus with separate program (16-bit) and data (8-bit) paths. A hardware 8x8 multiplier accelerates arithmetic, and the 17-level deep hardware stack supports nested subroutine calls. Brown-out reset and Power-on Reset blocks are integrated to protect against low-voltage fault conditions in industrial power environments. Typical applications include industrial control systems, automotive body controllers, HVAC equipment, motor-control interfaces, and embedded instrumentation. The wide I/O count (33 lines) supports keypad scanning, LCD drive, and sensor multiplexing without external glue logic. Designers often choose this part for cost-sensitive 5 V systems needing deterministic real-time response. When designing with this part, allocate sufficient decoupling (100 nF plus 10 uF bulk) close to VDD/AVDD pins, and observe Microchip's recommended oscillator layout for the 33 MHz crystal. The PIC17C43 is OTP, so production programming must be planned - use the -JW windowed variant for prototype development. This page synthesizes distributor pricing for the PIC17C43-33/PQ, drop-in PIC17C family alternatives, and practical design notes beyond the Microchip datasheet.

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PIC17C43-33/PT - 33MHz 8KB OTP 8-bit MCU, TQFP-44 | Microchip
PIC17C43-33/PT

PIC17C43-33/PT - 33MHz 8KB OTP 8-bit MCU, TQFP-44 | Microchip

The Microchip PIC17C43-33/PT is an 8-bit CMOS EPROM/ROM-based microcontroller delivering 8.25 MIPS (8.25 million instructions per second) at a 33 MHz clock input with a 121 ns instruction cycle, packaged in a 44-pin TQFP (Plastic Thin Quad Flat Pack, gull-wing, surface-mount). It features 8 KB of one-time-programmable (OTP) program memory, 454 bytes of RAM, and 33 digital I/O pins, targeting high-performance embedded applications where deterministic instruction timing and simple RISC architecture are required. The PIC17C43 belongs to the PIC17C family of high-performance 8-bit microcontrollers (a subfamily of the broader PIC microcontroller family, which in turn falls under the larger category of microcontroller -> embedded controller -> semiconductor). An 8-bit microcontroller integrates a CPU, RAM, ROM/EPROM, timers, and I/O peripherals on a single die, executing one instruction per instruction cycle (except program branches and table reads/writes which require two cycles) and offering deterministic timing that simplifies real-time control firmware design. Key features of the PIC17C43-33/PT include 58 single-word instructions, a hardware multiplier for fast arithmetic, multiple timer/counter modules, a USART for serial communication, and a 16-level deep hardware stack. The device is OTP, meaning the program memory can be programmed once using an EPROM programmer and is non-volatile thereafter. Its PIC17C architecture is upwards source-compatible with the PIC16C and PIC12C families, easing migration paths for legacy designs. This part is a member of Microchip's legacy PIC17C family, and Microchip recommends the PIC18F4220 as a newer Flash-based replacement for new designs. The PIC17C43-33/PT variant uses the commercial temperature grade (-40C to +70C operating range) and is supplied in 44-pin TQFP for surface-mount PCB assembly, while sibling parts exist in 40-pin PDIP (P), 44-pin PLCC (L), and 44-pin MQFP (PQ) packages. Typical applications include industrial control systems, motor control front-ends, instrumentation front panels, legacy POS terminal controllers, and white-goods appliance electronics. With 8.25 MIPS compute throughput, it can handle closed-loop PID control at modest update rates, multi-channel UART bridging, and discrete logic replacement where deterministic instruction timing matters more than absolute throughput. When designing with this OTP device, ensure firmware is fully validated against pre-programmed samples before committing to production volumes, since OTP parts cannot be reprogrammed or field-updated. Also verify that the chosen programmer supports the PIC17C43 OTP windowless device algorithm and that code density assumptions (58 instructions, 14-bit word) align with the available 8 KB of program memory. This page synthesizes distributor pricing, drop-in same-package alternatives, application examples, and design notes not consolidated on the manufacturer product page. Engineers comparing the PIC17C43-33/PT against PIC18F or PIC16F migration candidates can use the comparison table below to identify the lowest-risk migration path.

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PIC17C43-33I/L - 8-bit OTP MCU, 33MHz, 8KB, 44-PLCC | Microchip
PIC17C43-33I/L

PIC17C43-33I/L - 8-bit OTP MCU, 33MHz, 8KB, 44-PLCC | Microchip

The Microchip Technology PIC17C43-33I/L is a high-performance 8-bit CMOS EPROM/ROM microcontroller belonging to the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) at a 33 MHz clock in a 44-pin PLCC (J-Lead) package. It integrates 8 KB of OTP program memory (organized as 4K x 16), 454 bytes of SRAM, and 33 digital I/O lines, and operates from a 4.5 V to 6 V supply across the industrial -40C to +85C temperature range. What is a PIC microcontroller: a PIC microcontroller is a programmable logic device built around a RISC Harvard architecture, where program and data memories are separated to allow simultaneous instruction fetch and data access. PIC microcontrollers sit in the broader hierarchy of microcontroller -> embedded controller -> semiconductor IC, and the PIC17C family in particular targets applications requiring higher performance and more peripherals than the PIC16C baseline, while remaining software-compatible with classic PIC instruction sets. The PIC17C43 uses one-time-programmable (OTP) EPROM for code storage. Key features include a 16-bit-wide instruction word, hardware multiply, four counter/timer modules, a USART, and capture/compare/PWM capability, all housed in a 44-pin PLCC package measuring 16.59 x 16.59 mm. The die architecture supports a flexible interrupt controller and a watchdog timer for safety-critical control loops. Technically, the PIC17C43 implements Microchip's enhanced PIC RISC core with 58 single-word instructions, hardware stack, and 16-level-deep hardware subroutine nesting. The 33 MHz oscillator drives the internal four-phase clock generator, yielding an instruction cycle time of 121 ns. Two 8-bit and two 16-bit timers provide flexible event timing. Typical applications include industrial control systems, automotive subsystems, motor control firmware, and legacy embedded designs where a 5 V-tolerant 8-bit MCU with OTP code storage is preferred. The PLCC package is socket-friendly, allowing in-system firmware validation before OTP commitment. A newer recommended replacement is the PIC18F4220 (flash-based). When designing with this part, note that OTP means each device can be programmed only once - prototype with the JW (windowed) variant for code iteration. Decoupling and oscillator layout must follow the PIC17Cxx hardware reference for EMI-sensitive environments. This page consolidates Microchip product-page data, distributor live pricing from Mouser/LCSC, and pin-compatible alternatives not always surfaced on datasheet portals.

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PIC17C43-33I/P - 8-bit OTP MCU, 33MHz, 40-DIP | Microchip
PIC17C43-33I/P

PIC17C43-33I/P - 8-bit OTP MCU, 33MHz, 40-DIP | Microchip

The Microchip PIC17C43-33I/P is an 8-bit RISC CMOS OTP-based microcontroller running at 33 MHz instruction frequency (121 ns instruction cycle), packaged in a 40-pin PDIP through-hole format and offered in industrial temperature grade. The device integrates 8 KB of OTP program memory, 454 bytes of data RAM, 33 digital I/O lines, and Microchip's PIC17C4x architecture that is upwards compatible with the PIC16C5X, PIC12CXXX and PIC16CXX families. The '33I' suffix denotes the 33 MHz maximum clock rate and the industrial (-40C to +85C) operating range, while the trailing '/P' identifies the plastic DIP package. The PIC17C43 family is one of the earliest high-performance 8-bit PIC microcontrollers ever shipped by Microchip. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals, and timers onto one silicon die; a RISC MCU executes most instructions in a single clock cycle, simplifying pipelining and improving throughput per MHz. The PIC17C4x family sits above the PIC16 mid-range line in Microchip's original 8-bit hierarchy (PIC17C4x -> PIC16 -> PIC12 -> baseline PIC), targeting applications that need more performance, more RAM, and more I/O than a PIC16 can deliver while still using a familiar PIC instruction set. The 'C' in PIC17C43 indicates an OTP (one-time-programmable) CMOS process, suitable for prototyping and low-to-mid volume production where firmware is stable. Key electrical features include a 33 MHz maximum clock (8.25 MIPS sustained throughput), supply voltage of 4.5 V to 6.0 V (typical 5 V), 33 I/O pins, an 8-bit data bus external to the core, hardware USART, 16-bit capture/compare/PWM, and a programmable 8-bit prescaler watchdog timer. The industrial temperature grade guarantees operation from -40C to +85C. The PIC17C4x instruction set includes hardware 8x8 multiply, which is uncommon in mid-range 8-bit MCUs and accelerates DSP-like inner loops. Typical applications include industrial control panels, motor control front-ends, point-of-sale terminals, instrumentation, and legacy embedded system maintenance where 5 V rail, through-hole packaging, and a 16-bit-wide external memory bus are still valued. Because the part is OTP, it is most often used where the firmware is finalized and order volumes justify mask-programmed economics. When designing with PIC17C43-33I/P, ensure the Vdd decoupling network keeps ripple below 50 mV, place the 40-pin DIP socket allowing UV-erase window devices as development substitutes, and verify that any code migration to the recommended PIC18F4220 (Microchip's official modern replacement) preserves register-level behavior expected by legacy firmware libraries. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC17C43-33I/PT - 8KB OTP 8-bit MCU, 33MHz, TQFP-44 | Microchip
PIC17C43-33I/PT

PIC17C43-33I/PT - 8KB OTP 8-bit MCU, 33MHz, TQFP-44 | Microchip

The Microchip Technology PIC17C43-33I/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller in a 44-pin TQFP (PT) surface-mount package, operating at a 33 MHz clock speed with 8.25 MIPS instruction throughput (121 ns instruction cycle). It integrates 8 KB of One-Time-Programmable (OTP) program memory, 454 bytes of RAM, 33 general-purpose I/O lines, a 16-bit external data bus, and four timer modules, all on a 5 V supply. The PIC17C43 belongs to Microchip's PIC17 family of RISC microcontrollers, one of the earliest PIC architectures to introduce a 16-bit program word and external memory expansion capabilities for high-end 8-bit embedded designs. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, program memory (ROM/EPROM/OTP/Flash), data RAM, peripheral modules (timers, I/O, communication), and a clock onto a single silicon die. The 8-bit MCU hierarchy places this part within: microcontroller -> RISC microcontroller -> PIC architecture -> PIC17 family -> EPROM/OTP-based member. 8-bit MCUs remain widely deployed in cost-sensitive, deterministic, low-power applications such as motor control, instrumentation, and industrial control. Key features of the PIC17C43-33I/PT include a 33 MHz maximum operating frequency, 8 KB OTP program memory organized as 4K x 16-bit words, 454 bytes of data RAM, 33 digital I/O pins, four timer/counter modules, an external memory interface supporting up to 64 KB of program memory, a USART serial port, and an industrial-grade operating temperature range of -40 °C to +85 °C. The OTP-based program memory allows prototyping before committing to a ROM mask charge. Architecturally, the PIC17C43 uses a RISC instruction set with only 58 single-word instructions, a 16-bit program word width (uncommon for an 8-bit data MCU), an 8-bit data path, and Harvard bus architecture with separate program and data buses. This combination gives it higher code density per instruction than many competing CISC 8-bit cores while preserving the simplicity of 8-bit data manipulation. Typical applications include industrial control systems, motor drive controllers, instrumentation front-ends, security and alarm panels, and embedded control of legacy equipment. The wide 5 V supply tolerance (4.5 V to 5.5 V) suits factory-floor 5 V regulated buses. When designing with this part, note that Microchip's product page recommends PIC18F4220 as the recommended replacement for new designs, indicating the PIC17C43 is in a mature/legacy status with limited new design activity. The PT suffix indicates TQFP package, the I indicates industrial temperature grade, and 33 indicates the 33 MHz maximum clock.

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PIC17C43/JW - 8-Bit 33MHz 8KB EPROM Microcontroller | Microchip
PIC17C43/JW

PIC17C43/JW - 8-Bit 33MHz 8KB EPROM Microcontroller | Microchip

The Microchip Technology PIC17C43/JW is a high-performance 8-bit CMOS EPROM-based microcontroller with 8KB (4K x 16) of UV-erasable program memory, packaged in a 40-pin windowed CERDIP. It executes instructions in a single 121 ns cycle at a 33 MHz clock input, delivering 8.25 MIPS throughput. The PIC® 17C architecture uses only 58 single-word instructions, most of which execute in a single instruction cycle (program branches and table reads/writes take two cycles). A microcontroller (MCU) is a single-chip computer containing a CPU, program memory, data RAM, and peripherals. The PIC17C43 belongs to the 8-bit MCU category (PIC16C5X/PIC12CXXX/PIC16CXX upward-compatible family), itself a subset of microcontrollers within the broader semiconductor and embedded systems hierarchy. EPROM-based MCUs with a quartz window allow UV erasure for development and re-programming, distinguishing them from one-time-programmable (OTP) or flash variants. Key features include 454 bytes of general-purpose RAM, multiple timer/counter modules, a synchronous/asynchronous serial port (USART/SCI), capture/compare/PWM modules, and an 8-bit parallel slave port. The device supports a wide operating voltage range of 4.5V to 5.5V and is offered in industrial (-40C to +85C) temperature grades. Hardware stack depth is 16 levels, supporting nested subroutine calls. The instruction set is RISC-based with Harvard architecture, providing deterministic interrupt response. Typical applications include industrial control systems, motor control, automotive subsystems (pre-CAN ECU designs), instrumentation, and embedded legacy designs. The combination of EPROM (re-programmable during development) and CERDIP packaging makes it well-suited to prototype and qualification phases. Microchip's product page notes that a newer device, the PIC18F4220, is recommended for new designs, but the PIC17C43/JW remains in production for legacy support. When designing with this part, place 0.1 uF decoupling capacitors close to each VDD pin and connect all ground and VDD pins to minimize noise. EPROM windowed parts require a quartz window sticker or opaque tape in production to prevent UV-induced data corruption. Programming is performed via Microchip's PRO MATE or PICSTART toolchains. This page synthesizes distributor pricing, drop-in alternatives, lifecycle status, and practical design notes not consolidated on the manufacturer datasheet alone. Pricing references are as of 2026-09-25.

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PIC17C43T-16/L - 8KB OTP 8-bit MCU 16MHz 44-PLCC | Microchip
PIC17C43T-16/L

PIC17C43T-16/L - 8KB OTP 8-bit MCU 16MHz 44-PLCC | Microchip

The Microchip Technology PIC17C43T-16/L is an 8-bit RISC microcontroller from the PIC® 17C family featuring 8KB (4K x 16) of One-Time Programmable (OTP) program memory, 454 bytes of RAM, and a 16 MHz maximum clock speed, packaged in a 44-pin PLCC (Plastic Leaded Chip Carrier) with J-leads. It operates from a 4.5 V to 6 V supply and is targeted at commercial temperature range (0 °C to +70 °C) applications such as industrial automation and consumer electronics. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a microcontroller built around an 8-bit data path whose program memory is a One-Time Programmable EPROM cell—each bit can be programmed exactly once with an EPROM writer and exposed to UV light for erasure. These parts occupy a middle position in the hierarchy: microcontroller -> embedded controller -> 8-bit MCU -> OTP EPROM MCU -> RISC controller -> semiconductor. The PIC17C43 uses Microchip's enhanced PIC 17C core, which delivers up to 8.25 MIPS (121 ns instruction cycle) and supports 58 single-word instructions, making it significantly faster than legacy PIC16C5X devices while remaining source-code compatible. Key features include 33 digital I/O lines organized as 4 ports, a hardware multiply (8 x 8 in one cycle), 16-bit data bus architecture, Power-on Reset (POR), Brown-out Reset, Watchdog Timer (WDT), Pulse Width Modulation (PWM) peripherals, a Capture/Compare/PWM (CCP) module, and an 8-level deep hardware stack. The OTP memory is organized as 4K x 16, so each instruction word is 16 bits wide and fetches in one cycle. The PIC17C43 architecture extends the PIC16CXX instruction set with hardware multiplication, a 16-bit wide program word, and four register page pointers. It is upward-compatible with the PIC16C5X, PIC12CXXX and PIC16CXX families, allowing code migration from smaller PICs with minimal redesign. The 16 MHz oscillator yields a 4 MHz instruction rate (divide-by-4) and an effective 8.25 MIPS throughput. Typical applications include industrial automation controllers, motor control, HVAC, security alarm panels, consumer appliance control, smart-card readers, and embedded control modules. The 33 I/O lines are sufficient for keypad scanning, LED matrix driving, and parallel sensor interfacing. The PWM and CCP modules make the PIC17C43 well-suited for brush-DC and stepper motor drive designs in low-cost industrial equipment. Designers should note that the PIC17C43 has been replaced by the PIC18F family (Microchip recommends PIC18F4220). New designs should target the PIC18F, but the PIC17C43T-16/L remains available for legacy maintenance and repair. The OTP memory cannot be re-programmed, so production firmware must be fully validated before device programming. This page synthesizes verified distributor pricing, drop-in compatible Microchip alternatives, and engineering design notes for the PIC17C43T-16/L that complement the manufacturer's datasheet.

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PIC17C43T-16/PT - 8KB OTP 8-Bit MCU 33MHz 44-TQFP | Microchip
PIC17C43T-16/PT

PIC17C43T-16/PT - 8KB OTP 8-Bit MCU 33MHz 44-TQFP | Microchip

The Microchip PIC17C43T-16/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller delivering 16 MIPS throughput at a 33 MHz clock input in a 44-pin TQFP package with Tape & Reel packaging. It integrates 8KB of One-Time Programmable (OTP) program memory, 454 bytes of general-purpose RAM, and 33 digital I/O pins, providing a single-chip solution for embedded control. The architecture executes all 58 single-word instructions in a single 121 ns instruction cycle except for program branches and table reads/writes, which take two cycles. An 8-bit microcontroller (MCU) is a programmable logic device that combines an 8-bit CPU core, non-volatile program memory (ROM/EPROM/Flash), volatile data RAM, and a fixed set of peripherals on a single silicon die. Within the broader taxonomy it sits under microcontroller -> embedded controller -> microprocessor -> semiconductor IC. The 8-bit class typically serves cost-sensitive, deterministic, low-power applications where 32-bit performance is overkill, and it remains dominant in industrial, automotive, and white-goods control segments where instruction determinism and long product tail support outweigh raw throughput. Key features of the PIC17C43T-16/PT include a 16-bit-wide instruction word (despite the 8-bit data path), a Harvard architecture with separate program and data buses, an internal 8 x 8 hardware multiplier (single-cycle), a 16-level deep hardware stack, and an 8-bit real-time timer/counter with an 8-bit prescaler. The supply range is 4.5 V to 6 V and the part supports in-circuit serial programming through the standard PIC ICSP interface. Brown-out reset, power-on reset, and a watchdog timer with an on-chip RC oscillator are integrated for safety-critical control. Typical applications include motor control, SMPS primary-side control, industrial instrumentation, automotive body controllers (pre-CAN era), and white-goods user interfaces. The 33 I/O pins are sufficient to drive segment LCD multiplexers, keypad matrices, and triac-fired loads simultaneously. The OTP memory allows flexible in-system firmware revision during development, with masked-ROM (PIC17CR43) variants available for volume production. When designing with this device, ensure the 5 V supply is well-regulated; the EPROM cell retention is sensitive to extended operation below 4.5 V. For new designs, prefer the PIC18F family or dsPIC33EP family for active development and tool-chain support, since PIC17C is a legacy mature line. Always confirm the latest Microchip product longevity statement before committing to long-life designs. This page synthesizes verified distributor pricing, drop-in same-package alternatives drawn from the PIC17C family, comparison parameters, and practical design notes - information not assembled in the manufacturer datasheet itself.

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PIC17C43T-16E/PQ - 8KB OTP 8-bit MCU 16MHz 44-MQFP | Microchip
PIC17C43T-16E/PQ

PIC17C43T-16E/PQ - 8KB OTP 8-bit MCU 16MHz 44-MQFP | Microchip

The Microchip Technology PIC17C43T-16E/PQ is a high-performance 8-bit CMOS EPROM-based microcontroller from the PIC17C family, delivering 8.25 MIPS (121 ns instruction execution) from a 16 MHz external oscillator, housed in a 44-pin Metric QFP (MQFP, package code PQ) on tape-and-reel. According to the PIC17C43 datasheet (DS30412C family, Rev. A), the device integrates 8 KB of OTP program memory (4K x 16), 454 bytes of general-purpose RAM, and 33 digital I/O pins, making it the largest pin-count member of the PIC17C4x family. A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory (here, OTP EPROM), volatile data memory (RAM), and programmable peripheral I/O. The PIC17C43 family occupies the high end of Microchip's original 8-bit PIC hierarchy - upward compatible with PIC16C5X, PIC12CXXX, and PIC16CXX devices - and sits architecturally between mid-range PIC16 and the later 16-bit PIC24/dsPIC families. As an EPROM (erasable programmable read-only memory) part, the PIC17C43 is windowed or OTP and is intended for prototyping and low-volume production; flash-based successors such as PIC18F4220 are recommended for new designs. Headline features include 58 single-word instructions, a 16-level hardware stack, 4 timer/counter modules (Timer0, Timer1, Timer2, Timer3 with CCP capture/compare/PWM), a USART with 9-bit address detect, a 12-bit multiply, and selectable oscillator modes (RC, XT, HS, LP). The 33 I/O pins support individual direction control and interrupt-on-change. The 'E' suffix denotes the Extended (industrial) temperature grade of -40 C to +125 C, while the -16 suffix denotes a 16 MHz maximum operating frequency. Architecturally, the PIC17C43 uses a Harvard RISC core with a 16-bit instruction word and an 8-bit data path, providing a compact code density advantage over 8-bit CISC architectures. The 8.25 MIPS throughput is the highest in Microchip's 8-bit line at the time of release, supporting real-time control loops and serial communication stacks without DMA. The part operates from a single 5 V supply with typical ICC around 5 mA at 16 MHz and < 5 uA in SLEEP, giving a reasonable active/sleep power ratio for embedded designs. Typical applications include industrial control front-ends, instrumentation with on-board user interfaces, motor control via CCP/PWM, and embedded communication bridges using the USART. The 8 KB OTP program memory is sufficient for protocol stacks plus custom application code in legacy designs. When designing, note that the PIC17C43 is mature and being phased out - Microchip recommends PIC18F4220 as a modern replacement. New designs should evaluate PIC18F or PIC24 alternatives; existing OTP-based production should consider migrating to flash equivalents before EOL supply becomes critical. This page synthesizes distributor pricing, drop-in alternatives within the PIC17C43 family, and practical design notes not aggregated in the manufacturer datasheet.

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PIC17C43T-16E/PT - 8KB OTP PIC 8-bit MCU 16MHz 44-TQFP | Microchip
PIC17C43T-16E/PT

PIC17C43T-16E/PT - 8KB OTP PIC 8-bit MCU 16MHz 44-TQFP | Microchip

The Microchip Technology PIC17C43T-16E/PT is a high-performance 8-bit CMOS EPROM/ROM-based microcontroller in the PIC17C family, featuring 8 KB (4K x 16) of One-Time-Programmable (OTP) program memory and 454 bytes of RAM in a 44-pin TQFP surface-mount package. It executes instructions at 16 MHz with a 121 ns instruction cycle, delivering up to 8.25 MIPS throughput. The device provides 33 digital I/O pins and is qualified for the -40C to +125C extended operating temperature range, making it suitable for industrial and automotive-grade embedded designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and peripherals onto one die. The PIC17C43 belongs to the PIC microcontrollers (Peripheral Interface Controller) family from Microchip Technology, an 8-bit RISC architecture that became an industry standard for low-power embedded control. Within the broader taxonomy, the PIC17C43 sits between the original PIC16 mid-range family and the later PIC18 enhanced family, offering more code space and a wider instruction set while preserving the classic PIC RISC efficiency. As an OTP part, its program memory is written once at production and cannot be erased, which keeps unit cost low and suits high-volume fixed-function products. Key features include 58 single-word instructions (most are single-cycle, with only program branches and table reads/writes taking two cycles), an external interrupt controller, a hardware multiply unit, and a 16-level hardware stack. Peripherals include three timer/counter modules, a synchronous serial port (SSP) configurable as SPI or I2C, a USART with addressable mode, dual analog comparators, and a watchdog timer with its own on-chip RC oscillator. The 33 I/O pins can source/sink up to 25 mA for direct LED drive. Typical applications include industrial control panels, motor drive interfaces, security alarm systems, and point-of-sale terminals where a one-time-programmed controller is preferred over flash. The wide -40C to +125C operating range also allows deployment under the hood of passenger vehicles. Designers should review Microchip's PIC17C family migration note to PIC18F parts when planning new designs, since Microchip recommends PIC18F4220 as the newer replacement device; the OTP PIC17C43 remains in production for legacy programs.

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PIC17C43T-16I/PQ - 8-bit 33MHz OTP MCU 8KB ROM MQFP-44 | Microchip
PIC17C43T-16I/PQ

PIC17C43T-16I/PQ - 8-bit 33MHz OTP MCU 8KB ROM MQFP-44 | Microchip

The Microchip Technology PIC17C43T-16I/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller built around an enhanced RISC architecture, offering 33 MHz maximum clock input and a 121 ns single-cycle instruction execution. It integrates 8 KB of one-time programmable (OTP) program memory in a 44-pin Metric Quad Flat Pack (MQFP, package code PQ) supplied on tape and reel, making it suited to volume industrial through-hole-free assembly. A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory, data RAM, and programmable I/O peripherals. The PIC17C family occupies the high-performance tier of Microchip's classic 8-bit lineup, with a Harvard architecture, separate program and data buses (16-bit program bus / 8-bit data bus), and a 58-instruction set that the manufacturer describes as learnable in a single sitting. The PIC17C43T-16I/PQ targets legacy embedded control designs that need more code space and I/O than mid-range PIC16 devices can supply. Key features include 8 KB of OTP program memory, 454 bytes of general-purpose data RAM, 33 programmable digital I/O pins spread across five ports, a hardware USART, an 8-bit timer/counter, and a watchdog timer with its own on-chip RC oscillator for reliable reset behavior. The device operates from a 4.5 V to 5.5 V supply, supports in-circuit serial programming through the RB6/RB7 pins, and offers four oscillator modes including crystal and RC. The architecture uses a 16-bit wide program-memory bus to fetch one instruction word per cycle, paired with an 8-bit data bus. This asymmetry is the source of the family's quoted 121 ns instruction cycle at 33 MHz: branches and table reads/writes incur a two-cycle penalty. The 16-bit internal program path is the reason the manufacturer literature describes the part as a "16-bit data bus" device while the core remains 8-bit at the ALU and register level. Typical applications include industrial control panels, instrumentation front-ends, motor control auxiliary logic, security and access-control panels, and other embedded systems where deterministic 8-bit execution, OTP code security, and a generous 5-port I/O count are required. The 'I' suffix denotes the industrial temperature range of -40C to +85C. Design consideration: because program memory is OTP, code must be fully validated on a windowed (JW) or EPROM-emulation part before committing to the PIC17C43T-16I/PQ. The 16-bit program path also means the toolchain and instruction set are NOT compatible with PIC16 or PIC18 devices - migrating between PIC families requires a full code port. This page synthesizes distributor pricing, drop-in package alternatives, and practical design notes that are not consolidated in the manufacturer datasheet.

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PIC17C43T-16I/PT - 8-Bit 33MHz OTP MCU, 8KB EPROM, TQFP-44 | Microchip
PIC17C43T-16I/PT

PIC17C43T-16I/PT - 8-Bit 33MHz OTP MCU, 8KB EPROM, TQFP-44 | Microchip

The Microchip PIC17C43T-16I/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller delivering 8.25 MIPS at a 121 ns instruction cycle, packaged in a 44-pin TQFP (PT) industrial-temperature-grade surface-mount outline. It integrates 8 KB of one-time-programmable (OTP) EPROM program memory and is rated for a 33 MHz external clock input at the 16 MHz instruction-rate designation (16I), with a 4.5 V to 6.0 V supply range suitable for legacy 5 V embedded designs. A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory, data memory (RAM), and programmable peripherals on a single silicon die. The PIC17C family sits above the PIC16 mid-range family and below the PIC18 enhanced family in Microchip's 8-bit hierarchy, making PIC17C43 a stepping stone for designs needing more code space and I/O than a PIC16 but without migrating to PIC18. The part uses a RISC Harvard architecture with only 58 single-word instructions, and almost all instructions execute in a single instruction cycle - program branches and table reads/writes are the only two-cycle exceptions. Key specifications include 33 I/O pins distributed across multiple ports, 33 MHz maximum clock input, an internal data EEPROM emulation scheme, and a 16-bit-wide data bus path for fast table reads. The 'I' suffix denotes the industrial temperature grade (-40 C to +85 C), and the 'T' suffix denotes tape-and-reel packaging. Per the manufacturer cross-reference note, a newer recommended replacement is PIC18F4220 for new designs. Typical applications include legacy industrial control systems, motor-control front-ends, automotive body electronics (where 5 V rails and 33 I/O are needed), instrumentation, and embedded control boards migrating from PIC16 to PIC17 where the 8 KB OTP window fits the application. The 16-bit data-bus width is leveraged for high-throughput peripheral control and table-driven state machines. When designing with this part, note that the 17C-series OTP requires a UV-erase window or windowless-OTP programming. For new designs Microchip recommends PIC18F4220 as the functional successor; for pin-compatible PIC17C-family alternatives that retain the same TQFP-44 footprint, see the alternatives section below.

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PIC17C43T-25/L - 8-bit 25MHz OTP MCU, 8KB, 44-PLCC | Microchip
PIC17C43T-25/L

PIC17C43T-25/L - 8-bit 25MHz OTP MCU, 8KB, 44-PLCC | Microchip

The Microchip Technology PIC17C43T-25/L is an 8-bit RISC microcontroller from the PIC® 17C series operating at 25 MHz with 8 KB (4K x 16) of One-Time Programmable (OTP) program memory and 454 bytes of RAM, housed in a 44-pin PLCC (J-Lead) package. The device executes instructions in 121 ns (approximately 8.25 MIPS) using a 16-bit-wide instruction word and an 8-bit-wide data path. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data bus, integrating a CPU core, program memory, RAM, and peripherals. The PIC17C43 belongs to the PIC® 17C family of enhanced 8-bit MCUs from Microchip, which sits between the baseline PIC16 family and the 16-bit dsPIC family in the broader Microchip 8-bit -> 16-bit -> 32-bit MCU hierarchy. This category typically targets industrial control, motor drive, and instrumentation designs that need more horsepower and peripherals than a PIC16 can offer. Key features include 33 I/O pins across multiple ports, a USART for serial communication, a Capture/Compare/PWM (CCP) module, an 8-channel 10-bit (or 8-bit) analog-to-digital converter, Power-On Reset (POR), Brown-Out Reset (BOR), and a Watchdog Timer (WDT). The MCU operates from a 4.5 V to 6 V supply, with the -25 speed grade denoting a 25 MHz maximum oscillator frequency. The 'T' suffix indicates tape-and-reel packaging, and '/L' denotes the 44-pin PLCC J-Lead form. Architecturally, the PIC17C43 uses a Harvard-style design with separate program and data buses, a 16-level hardware stack, and an enhanced instruction set (58 single-word instructions) that is upwards-compatible with the PIC16C5X/PIC16CXX families. The OTP EPROM cell allows one-time field programming with a production-friendly flow versus windowed UV-erasable parts. Typical applications include industrial motor control, SMPS primary-side control, HVAC fan and damper control, security and access panels, and white-goods user interfaces. With 33 I/O lines, the part is well-suited to keypad scanning, LED/LCD multiplex driving, and sensor aggregation. The 8 MIPS performance is sufficient for closed-loop PID loops at modest update rates. When designing with this part, observe the maximum 25 MHz oscillator limit at 5 V, derate clock frequency if VDD drops near 4.5 V, and reserve adequate ground copper under the PLCC to keep digital switching noise away from analog AVdd/AVss. The PIC17C43 is in production but is considered a mature product; Microchip recommends the PIC18F family or PIC18F4220 as a long-term migration path for new designs.

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PIC17C43T-25/PQ - 8KB OTP 8-Bit PIC MCU 25MHz | Microchip
PIC17C43T-25/PQ

PIC17C43T-25/PQ - 8KB OTP 8-Bit PIC MCU 25MHz | Microchip

The Microchip Technology PIC17C43T-25/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, featuring 8KB (4K x 16) of One-Time Programmable (OTP) program memory and operating at 25 MHz with a 121 ns instruction cycle. It is housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm) and is supplied on tape and reel. According to the PIC17C43 datasheet, the device executes 58 single-word instructions, supports up to 33 general-purpose I/O pins, and runs from a 4.5 V to 6 V supply. The "T" suffix indicates tape-and-reel packaging and "25" indicates the 25 MHz maximum clock input. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data memory, and configurable peripheral interfaces. The PIC17C family is the first generation of Microchip's 8-bit RISC architecture to use a 16-bit-wide instruction word and a 16-level hardware stack, sitting between the PIC16 mid-range and PIC18 enhanced devices in Microchip's 8-bit portfolio. PIC17C parts are categorized as EPROM/ROM-based 8-bit microcontrollers within the broader power-management-and-control IC hierarchy. Key features include 8KB OTP program memory, 454 bytes of general-purpose RAM, hardware multiplier, 8-level deep hardware stack, 33 I/O pins, two 8-bit timer/counters, one 16-bit timer/counter, a Universal Synchronous/Asynchronous Receiver-Transmitter (USART) port, and a capture/compare/PWM (CCP) module. The instruction set is upward-compatible with PIC16C/PIC12C devices, easing migration for legacy code bases. Technically, the device is built on a CMOS EPROM process and supports in-circuit serial programming (ICSP) for OTP programming in production environments. The Harvard architecture separates program and data buses, allowing instruction fetch and data access to occur in parallel and delivering deterministic 121 ns instruction timing. At 25 MHz the part delivers approximately 8.25 MIPS, sufficient for real-time control loops in motor-drive and instrumentation designs. Typical applications include industrial control, consumer electronics, and automotive subsystems such as instrument clusters and HVAC controllers. It is also used in test-and-measurement instrumentation and as an embedded control engine for legacy PIC16 designs that need a 16-bit program word. When designing with this part, note that the PIC17C43 is now in EOL/obsolete status - consider the recommended replacement, the PIC18F4220, for new designs. Existing PIC17C43 firmware can be migrated to PIC18 with minimal rewrite due to the upward-compatible instruction set. This page synthesizes distributor pricing, drop-in alternatives (PQ package only), and practical design notes not found in the standalone datasheet.

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PIC17C43T-25/PT - 8KB OTP 8-Bit MCU, 25MHz, 44-TQFP | Microchip
PIC17C43T-25/PT

PIC17C43T-25/PT - 8KB OTP 8-Bit MCU, 25MHz, 44-TQFP | Microchip

The Microchip Technology PIC17C43T-25/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller from the PIC17C family, delivering 8.25 MIPS throughput (121 ns instruction cycle) at a 33 MHz clock input. Housed in a 44-pin TQFP (10x10 mm) surface-mount package, this OTP (One-Time Programmable) device integrates 8KB of program memory organized as 4K x 16 words and 454 bytes of general-purpose RAM, with 33 digital I/O lines for peripheral expansion. The core is a RISC-based PIC architecture featuring only 58 single-word instructions, where most instructions execute in a single cycle (121 ns), except for program branches and table reads/writes which require two cycles. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, RAM, program memory (ROM/EPROM/Flash/OTP), and peripheral I/O. The PIC17C family sits at the top of Microchip's original 8-bit portfolio as a high-performance tier, superseding the PIC16CXX and PIC12CXXX families. The PIC17C43T-25/PT occupies the power-management tier of this hierarchy: microcontroller -> embedded controller -> semiconductor device. Its EPROM-based program memory enables fast prototyping without mask-ROM NRE charges, while OTP restricts each device to one-time field programming via standard EPROM programmers. Key features include 25 MHz maximum operating frequency, an instruction execution time of 121 ns, 33 I/O pins, a hardware multiplier, multiple timer/counter modules, and capture/compare/PWM peripherals. The 16-bit-wide instruction word (4K x 16 organization) provides higher code density than the 14-bit PIC16CXX architecture. The integrated watchdog timer, brown-out reset, and power-on reset support robust embedded designs. The 44-TQFP package offers gull-wing leads with a 10x10 mm footprint suitable for standard SMT assembly lines. Typical applications include industrial control systems, consumer electronics, automotive subsystems, motor control, and embedded instrumentation. The wide 4.5V to 6V supply range and 33 I/O lines support direct interfacing to switches, relays, sensors, and small displays without external glue logic. Compared with newer PIC18F and dsPIC33 alternatives, the PIC17C43T-25/PT is positioned for legacy designs requiring maintained pin-compatibility and is recommended for refresh of existing PIC17C43 designs rather than greenfield development. When designing with the PIC17C43T-25/PT, note that the EPROM windowed variants (JW package) require quartz erasure for reprogramming, while the OTP -25 speed grade supports one-time field programming only. Ensure decoupling: place a 100 nF ceramic capacitor adjacent to each VDD/VSS pair, plus a 10 uF bulk capacitor on the main supply rail. Use a 25 MHz fundamental-mode crystal or ceramic resonator with the on-chip oscillator, and verify the configuration bits match the instruction-cycle timing budget. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Engineers migrating to newer parts should review Microchip's migration guides from PIC17C to PIC18F or dsPIC33 families.

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PIC17C43T-25E/PQ - 8KB OTP 8-bit MCU, 25MHz, 44-MQFP | Microchip
PIC17C43T-25E/PQ

PIC17C43T-25E/PQ - 8KB OTP 8-bit MCU, 25MHz, 44-MQFP | Microchip

The Microchip Technology PIC17C43T-25E/PQ is a high-performance 8-bit CMOS OTP microcontroller from the PIC17C family, delivering up to 8.25 MIPS instruction throughput with 121 ns instruction cycle time at a 25 MHz external clock. It integrates 8KB (4K x 16) of one-time-programmable EPROM program memory and 454 x 8 bits of general-purpose SRAM, packaged in a 44-pin Metric Quad Flat Pack (MQFP, also referenced as 44-QFP with J-Lead variant). The PIC17C43T offers 33 digital I/O pins, an 8-bit data bus, and a rich peripheral set including multiple timers, a USART, and capture/compare/PWM modules that were advanced for an 8-bit part at the time of release. A microcontroller (MCU) is a single-chip computer that contains a CPU core, non-volatile program memory (ROM/EPROM/Flash), working RAM, and integrated peripherals. The PIC17C43T belongs to the OTP subclass (one-time programmable EPROM, as opposed to Flash or windowed UV-erase EPROM) - the trade-off is lower unit cost in return for no field re-programmability. Within the Microchip PIC taxonomy, PIC17C sits between the PIC16C mid-range and the PIC18 enhanced family, offering a wider 16-bit instruction word and an enlarged register file aimed at high-throughput 8-bit control. Key features of the PIC17C43T-25E/PQ include hardware multiplier support, multi-source interrupt controller, and DC-25 MHz operating speed at 5V VDD. The -25 speed designation corresponds to 25 MHz maximum clock frequency, while the E suffix denotes the Extended industrial temperature range (-40C to +125C). The part is offered in Tape & Reel (T) packaging on the PQ (MQFP) 44-pin land pattern, making it compatible with high-volume surface-mount assembly. Typical applications include industrial control systems, motor drive front-ends, embedded sensor hubs, and legacy replacement boards where PIC16C5X/PIC12CXXX designs need an upgrade path while preserving the PIC instruction-set compatibility. Because the PIC17C family is mature, modern designs typically migrate to PIC18F or dsPIC33 families; Microchip's own product page currently recommends PIC18F4220 as the modern replacement. When designing with the PIC17C43T, ensure your programmer supports the OTP variant (the windowed JW package is required only for EPROM erase/retry development). The PQ package has a thermal resistance suitable for typical industrial environments, but the OTP memory means firmware must be fully verified before production programming.

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