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

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

The Microchip Technology PIC17C43T-25E/PT is a high-performance 8-bit CMOS RISC microcontroller from the PIC17C family, integrating 8 KB (4K x 16) of One-Time Programmable (OTP) program memory, 454 bytes of RAM, and 33 digital I/O pins in a 44-pin TQFP surface-mount package. Operating at up to 25 MHz from a 5 V supply, this part delivers approximately 121 ns instruction cycle time and is engineered for embedded-control applications requiring deterministic response and a moderate memory footprint. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, program memory (ROM/OTP/Flash), working RAM, peripherals, and I/O into one package. The PIC17C family belongs to the broader PIC microcontroller taxonomy (PIC10/12/16/17/18/24/dsPIC), which Microchip subdivides by data width, instruction set and peripheral richness. Within power-management and control hierarchies, the PIC17C line sits between baseline PIC16 devices and enhanced PIC18 devices, offering a wider instruction set, hardware multiply, and an external-memory bus on selected die variants for legacy designs migrating from 80C51-class controllers. Key features of the PIC17C43T-25E/PT include a RISC architecture with only 58 single-cycle instructions, dual 8-bit timer/counters with 16-bit read/write, a 16-bit capture input, a 16-bit PWM output, a hardware USART with addressable transmit/receive buffer, and an 8-channel 10-bit (typical) successive-approximation ADC. The Extended (E) temperature grade supports -40C to +125C operation, and the /PT suffix designates a 44-pin TQFP package supplied in Tape & Reel packaging for high-volume SMT assembly. The device also exposes an external-memory interface capable of addressing up to 64 Kbytes of external program memory and 64 Kbytes of external data memory, which is unusual for a modern 8-bit MCU. Typical applications include industrial automation controllers, automotive subsystems (where the E temperature grade matters), consumer-electronics keypads and remote-control transmitters, motor control for small DC/stepper drives, instrumentation front ends, and legacy embedded designs migrating from older 80C51 or PIC16 platforms. The combination of OTP memory, wide temperature range, and an external memory bus makes the PIC17C43T-25E/PT a strong fit for production-volume designs that must remain code-locked while still tolerating harsh environments. When designing with this device, engineers must provide a 5 V regulated supply, an external clock source (oscillator type is listed as External in the manufacturer data), and observe the OTP programming window (typically high-voltage VPP). Modern replacements from Microchip such as the PIC18F family offer Flash memory and lower power, but the PIC17C43T-25E/PT remains preferred where field-proven PIC17C code bases, OTP security, or long-term stability of the PIC17 silicon revision are required.

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PIC17C43T-25I/PQ - 8-bit 25MHz OTP MCU 8KB EPROM | Microchip
PIC17C43T-25I/PQ

PIC17C43T-25I/PQ - 8-bit 25MHz OTP MCU 8KB EPROM | Microchip

The Microchip Technology PIC17C43T-25I/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller in the PIC17C family, delivering 8.25 MIPS throughput at a 25 MHz clock input and housed in a 44-pin MQFP (10x10 mm) package. It integrates 8 KB (4K x 16) of One-Time-Programmable (OTP) program memory, 454 bytes of data RAM, and 33 general-purpose digital I/O pins. An MCU (microcontroller) is a single-chip computer that combines a CPU core, program and data memory, peripherals, and I/O on one die. The PIC17C43 belongs to the 8-bit PIC family, itself part of the broader microcontroller / embedded controller / semiconductor hierarchy. Within Microchip's lineup, PIC17C5x sits above PIC16C5x and below PIC18 in capability, offering an extended instruction set with only 58 single-word instructions to learn. Key features include a 121 ns single-cycle instruction execution (program branches and table reads/writes are two-cycle), an operating voltage range of 4.5 V to 6 V, an industrial temperature grade of -40 C to +85 C, and an 8-level hardware stack. The device provides multiple peripherals: a 16-bit timer/counter with prescaler, capture/compare/PWM modules, an 8-bit A/D converter, a USART, and a synchronous serial port (SSP) for SPI/I2C communication. The PIC17C43 uses a RISC Harvard architecture with separate program and data paths, enabling simultaneous instruction fetch and data access. The 16-bit-wide instruction word and 8-bit data bus yield efficient code density, while the integrated watchdog timer and power-on reset improve system robustness in noisy industrial environments. Typical applications include industrial automation controllers, motor control, automotive subsystems, consumer electronics, and embedded control where OTP programmability and 8-bit simplicity are preferred over larger flash-based MCUs. Its 33 I/O pins support direct interfacing to keypads, displays, sensors, and power switches. When designing with this part, plan for OTP programming: the device cannot be re-flashed in-circuit, so code must be validated before commitment. An erasable CERDIP variant (JW package) exists for development. Adequate decoupling and oscillator layout are essential for the high-frequency 25 MHz operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC17C43T-25I/PT - 8-bit OTP MCU 8KB EPROM 25MHz TQFP-44 | Microchip
PIC17C43T-25I/PT

PIC17C43T-25I/PT - 8-bit OTP MCU 8KB EPROM 25MHz TQFP-44 | Microchip

The Microchip Technology PIC17C43T-25I/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller featuring 8 KB of on-chip One-Time-Programmable (OTP) program memory, a 25 MHz maximum clock input, and 454 bytes of general-purpose RAM, all housed in a 44-pin TQFP (PT) surface-mount package delivered on tape-and-reel. The 'T' suffix indicates tape-and-reel packaging, the '25' indicates the 25 MHz speed grade, the 'I' indicates an industrial operating temperature range, and the '/PT' suffix confirms the TQFP-44 footprint. According to the Microchip datasheet, the device executes most instructions in a single 121 ns instruction cycle (excluding program branches and table reads/writes, which require two cycles), and it can deliver up to 8.25 MIPS throughput at the 33 MHz clock ceiling of the PIC17C43 family. An 8-bit microcontroller (MCU) is a self-contained computing element built around an 8-bit data path, on-chip program memory, on-chip data RAM, and a set of peripherals such as timers, capture/compare/PWM modules, USARTs, and I/O ports. The PIC17C43 sits at the top of the original PIC17C family - a high-performance extension of the PIC16 mid-range line - and was Microchip's first PIC architecture to feature a 16-bit instruction word with 8-bit data, hardware multiply, multiple interrupt sources, and a 16-level hardware stack. It belongs to the broader hierarchy: microcontroller -> embedded controller -> semiconductor -> integrated circuit. Key differentiating features include only 58 single-word instructions to learn (simplifying firmware development), a 25 MHz external clock input yielding a 160 ns instruction cycle, an instruction set with hardware multiply, four interrupt sources, a 16-level deep hardware stack, and 33 I/O pins (in the 44-pin TQFP). The architecture also incorporates a 4x phase-locked loop option on some family members, hardware USART, multiple timer/counter blocks, and capture/compare/PWM modules suited to real-time embedded control. The PIC17C43 is built on a CMOS EPROM process, allowing prototype and low-volume production programming with a windowed or OTP package. Industrial-temperature silicon ensures operation across -40 C to +85 C. Typical applications include industrial automation controllers, motor-control front-ends, instrumentation, automotive body and chassis modules (non-safety), embedded data-acquisition front-ends, and legacy embedded control designs that must be maintained or replaced part-for-part during long-lifecycle product support. Microchip recommends the newer PIC18F4220 as a modern migration path for new designs. When designing with this part, treat the OTP window carefully: the PIC17C43T ships as one-time-programmable, so code must be fully verified before production programming. Use the 44-pin TQFP land pattern exactly as published by Microchip, allow bulk decoupling near VDD/VSS pairs, and ensure the oscillator load capacitors match the chosen crystal. For new designs, evaluate the PIC18F family first; for legacy board repairs, the PIC17C43T-25I/PT remains a direct, footprint-compatible option.

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

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

The Microchip Technology PIC17C43T-33/PT is a high-performance 8-bit CMOS EPROM/ROM microcontroller built on Microchip's PIC17C architecture, delivering 8.25 MIPS at a 33 MHz clock input with a 121 ns instruction cycle, housed in a 44-pin TQFP surface-mount package. It integrates 8 KB of One-Time Programmable (OTP) program memory organized as 4K x 16 and 454 bytes of general-purpose RAM, alongside 33 general-purpose I/O pins and a 16-bit data bus. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that combines a CPU, program memory, RAM, and peripheral interfaces (UART, timers, I/O) on a single die. The PIC17C family sits above the legacy PIC16C5X in Microchip's taxonomy (PIC17C -> PIC16C -> PIC12C), targeting higher-performance applications that exceed what simpler PIC16 designs can deliver while retaining upward code compatibility. The PIC17C43 uses Harvard architecture with separate program and data buses, an 8.25 MIPS CPU core, and 58 single-word instructions. Key features include 58 single-word instructions for fast code development, single-cycle execution for most instructions (with two cycles only for program branches and table reads/writes), a 16-level hardware stack for subroutine nesting, and a 4.5 V to 5.5 V supply range. The PIC17C43T-33 commercial-temperature device runs from 0C to +70C and offers multiple oscillator modes including RC, XT, HS, and external clock input. Eight analog comparator inputs (shared with digital I/O) provide mixed-signal capability. Typical applications include industrial control systems, automotive body electronics, motor control, sensor signal conditioning, low-end embedded instrumentation, and consumer appliances that require more compute than a PIC16C but do not justify migration to PIC18. The 44-TQFP package offers a compact 10x10 mm footprint suitable for space-constrained designs while still exposing all 33 I/O pins. When designing with the PIC17C43, plan OTP programming into your production flow because OTP parts cannot be reprogrammed in-circuit. The PIC17C43 is now legacy; Microchip recommends migrating to PIC18F4220 for new designs. All cross-references and replacements identified below share the 44-TQFP footprint or differ only in temperature grade and speed bin. This page synthesizes verified distributor pricing, drop-in alternatives limited to the 44-TQFP footprint, and design notes that supplement the original Microchip datasheet for engineers evaluating long-term availability of the PIC17C43 family.

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PIC17C43T-33E/PT - 8-bit 33MHz 8KB OTP MCU 44-TQFP | Microchip
PIC17C43T-33E/PT

PIC17C43T-33E/PT - 8-bit 33MHz 8KB OTP MCU 44-TQFP | Microchip

The Microchip Technology PIC17C43T-33E/PT is an 8-bit CMOS OTP-based microcontroller from the PIC® 17C family, delivering 8.25 MIPS performance with a 121 ns instruction execution time, 8KB (4K x 16) of One-Time-Programmable program memory, 454 x 8 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin TQFP (10x10 mm) surface-mount package. The device operates at a maximum clock speed of 33 MHz and supports an external oscillator input, making it suitable for high-performance embedded control applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data memory (RAM), and peripherals onto one silicon die. The PIC17C43T belongs to Microchip's PIC® 17C family, a high-performance tier of the broader PIC architecture tree (PIC -> 8-bit MCU -> microcontroller -> embedded IC -> semiconductor). The '17C' lineage was Microchip's most capable 8-bit family before the PIC18 introduction, offering the highest code density and peripheral count in the classic 8-bit portfolio. PIC17C parts use 16-bit-wide instruction words and were typically deployed in motor control, instrumentation, and industrial automation designs where an 8-bit core was preferred for cost and toolchain familiarity. Key features of the PIC17C43T-33E/PT include the extended industrial temperature grade (E suffix, -40C to +125C), 33 I/O pins for interfacing to peripherals, hardware multiplier for fast arithmetic, multiple 16-bit timer/counters, a USART, and an instruction set of only 58 single-word instructions for fast code development. The 'T' suffix denotes tape-and-reel packaging for high-volume assembly. The OTP memory is one-time-programmable, requiring mask-programmed equivalents (PIC17CR43) for volume production runs after code freeze. Architecturally, the PIC17C43T uses a RISC-style Harvard architecture with separate program and data buses. Its 33 MHz maximum clock delivers 121 ns instruction cycles, enabling deterministic interrupt response - a hallmark of PIC microcontrollers. The device integrates brown-out detection, a watchdog timer, and in-circuit serial programming (ICSP) support for production-line programming. Typical applications include industrial motor control, instrumentation and metering, automotive body electronics (non-safety), HVAC controllers, and embedded control subsystems where deterministic real-time response is required. The 33 I/O count supports direct interfacing to keypads, displays, sensors, and power-stage FET drivers. When designing with the PIC17C43T-33E/PT, note that OTP memory cannot be erased - prototype carefully and plan for PIC17C44 or PIC18F alternatives during code development. The 5V nominal supply and 33 MHz operation require careful PCB layout for EMI control. This page synthesizes distributor pricing, drop-in same-package alternatives, and engineering design notes for engineers evaluating the PIC17C43T-33E/PT for legacy or new designs.

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PIC17C43T-33I/L - 33MHz 8-bit OTP MCU, 8KB, 44-PLCC | Microchip
PIC17C43T-33I/L

PIC17C43T-33I/L - 33MHz 8-bit OTP MCU, 8KB, 44-PLCC | Microchip

The Microchip Technology PIC17C43T-33I/L is a high-performance 8-bit CMOS OTP-based microcontroller from the PIC17C family, delivering 8.25 MIPS at a 33 MHz clock input with a 121 ns single-cycle instruction execution time. The device integrates 8 KB (4K x 16) of OTP program memory, 33 general-purpose I/O lines, and operates from a 4.5 V to 6 V supply, all housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) J-lead package. A microcontroller (MCU) is a single-chip computer that contains a processor core, program memory, RAM, and programmable I/O peripherals. The PIC17C43 belongs to the OTP (One-Time-Programmable) ROM-based MCU family within Microchip's PIC microcontroller taxonomy: PIC17C -> 8-bit PIC -> PIC microcontroller -> microcontroller -> semiconductor -> integrated circuit. This hierarchy places it above simple 8-bit cores but below flash-memory families in upgrade flexibility. Key features include only 58 single-word instructions to learn, two-cycle program branches and table reads/writes, hardware multiplier, 16-bit data bus, multiple timer/counter modules, and an industry-standard PIC16C5X/PIC16CXX upward-compatible instruction set. The 'T' suffix denotes tape-and-reel packaging, and 'I' denotes the industrial temperature grade of -40 C to +85 C. The 33 MHz speed code indicates a 121 ns instruction cycle. Architecturally, the PIC17C43 employs a RISC-based Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. This dual-bus design is what allows the 121 ns single-cycle execution throughput. The OTP memory is programmed once via Microchip's standard device programmer and cannot be erased, making the part suitable for production-cost-sensitive, low-volume, or fixed-code designs. Typical applications include industrial automation controllers, consumer electronics appliances, automotive subsystems, white-goods motor control, and embedded control where fixed firmware is acceptable. Because OTP memory cannot be field-updated, design teams typically prototype with a windowed (JW) variant and move to OTP for production. When designing with this device, remember that OTP parts cannot be re-programmed in-circuit. Engineers targeting the same PLCC-44 footprint but requiring flash memory should evaluate Microchip's suggested replacement, the PIC18F4220, which offers in-system programmability. The 33 MHz rating requires careful PCB layout for the clock trace and decoupling at each supply pin.

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

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

The Microchip Technology PIC17C43T-33I/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 up to 33 MHz clock input in a 44-pin MQFP (10x10 mm) surface-mount package. It executes instructions in a 121 ns single cycle (except program branches and table read/writes which are two-cycle) and is built on Microchip's enhanced PIC® RISC architecture with 58 single-word instructions, delivering up to 8.25 MIPS throughput. The device is rated for the industrial temperature grade (-40C to +85C) and includes 454 bytes of general-purpose RAM. An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one die. Within the broader taxonomy, the PIC17C43 belongs to the 8-bit MCU class -> microcontroller -> embedded controller -> semiconductor. Compared with PIC16C5X/PIC16CXX predecessors, the PIC17C family adds an expanded instruction set, larger memory addressing, and additional peripheral integration, making it suitable for higher-end embedded applications than baseline PIC16 devices can address. Key features include a Harvard architecture with separate program and data buses, multiple power-saving modes, selectable oscillator options (crystal/ceramic resonator), and a versatile interrupt controller supporting both internal and external interrupt sources. The 33 MHz clock yields the 121 ns instruction cycle that powers 8.25 MIPS throughput, while the OTP program memory provides flexible in-system reprogrammability during prototyping and small-batch production. The 33I/PQ suffix indicates 33 MHz speed, industrial temperature, tape-and-reel packaging, and the 44-pin MQFP plastic package. Typical applications include industrial control loops, motor control front-ends, automotive body/comfort subsystems (predecessor grade), consumer appliance controllers, security panel logic, and general-purpose 8-bit embedded platforms where a balance of throughput, ROM density, and I/O count is required. Its PIC17 heritage gives drop-in compatibility with designs migrated from PIC16CXX or earlier PIC17C42 systems. One important design consideration: Microchip has officially flagged the PIC17C43 as a legacy device and recommends the PIC18F4220 as a newer alternative. Engineers building new products should evaluate the PIC18F family for additional features, flash memory, and ongoing support, while still sourcing PIC17C43T-33I/PQ for existing design maintenance and production continuity. This PIC17C43T-33I/PQ product page synthesizes distributor availability, MQFP-package drop-in alternatives from the same PIC17C family, and practical design notes not aggregated on the manufacturer datasheet itself, helping engineers and procurement teams evaluate lifecycle risk and second-source options in a single view.

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PIC17C44-16/PQ - 16MHz 8-Bit OTP MCU, 16KB | Microchip
PIC17C44-16/PQ

PIC17C44-16/PQ - 16MHz 8-Bit OTP MCU, 16KB | Microchip

The Microchip Technology PIC17C44-16/PQ is a high-performance 8-bit CMOS EPROM/ROM microcontroller (MCU) that executes 58 single-word instructions at up to 16 MHz, delivering 8.25 MIPS with a 121 ns instruction cycle. Housed in a 44-pin MQFP package (10x10 mm, plastic quad flat pack), the device integrates 16 KB of one-time-programmable (OTP) program memory organized as 8K x 16 words, plus on-chip RAM and peripherals for embedded control applications. A microcontroller (MCU) is a single-chip computer that combines a CPU core, non-volatile program memory (ROM/Flash/EPROM), volatile data memory (RAM), and programmable I/O peripherals. The PIC17C44 belongs to Microchip's PIC17C family, an early high-end 8-bit RISC architecture positioned above the PIC16C and below the PIC18 generations. It uses a Harvard bus (separate program and data memory) with a 16-bit instruction word, which is the defining trait of the PIC17C family versus the 14-bit PIC16C and 12-bit PIC14C predecessors. Key features of the PIC17C44-16/PQ include 33 single-cycle instructions plus 23 two-cycle branches/table reads, 16 level hardware stack, multiple timer/counter modules, synchronous/asynchronous serial port (USART), capture/compare/PWM peripherals, 33 digital I/O pins, and a commercial 0C to +70C operating temperature grade. Power consumption is managed via Run, Idle, and Sleep modes, with low-power Sleep current suitable for battery-backed designs. Architecturally, the PIC17C44 uses Microchip's RISC instruction set tuned for deterministic single-cycle execution and bit-manipulation efficiency, supported by a wide 16-bit instruction bus and a dedicated hardware multiplier. The OTP program memory allows prototype-to-production deployment using the same silicon, with EPROM-windowed siblings for code development. Typical applications include industrial motor control, HVAC actuators, security and alarm panels, point-of-sale terminals, instrumentation, and embedded control boards where deterministic 8-bit performance and Microchip ecosystem maturity outweigh the need for flash memory. Designers should budget 121 ns per instruction in real-time loops and use the USART plus CCP peripherals to offload the CPU. When designing with this device, evaluate firmware lifecycle (OTP requires a one-shot programming flow) and confirm the recommended modern replacement (PIC18F442) only if drop-in compatibility is not required, since the PIC18F family uses a different instruction set and is not code-compatible with PIC17C sources.

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PIC17C44-16E/L - 16MHz 8-bit OTP MCU 16KB Flash | Microchip | Industrial
PIC17C44-16E/L

PIC17C44-16E/L - 16MHz 8-bit OTP MCU 16KB Flash | Microchip | Industrial

The Microchip Technology PIC17C44-16E/L is an 8-bit RISC CMOS OTP microcontroller from the PIC17C family, delivering 16 MHz core speed and 8.25 MIPS throughput with a 121 ns instruction cycle, in a 44-pin PLCC (J-Lead, 16.59x16.59 mm) package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, program memory, RAM, peripherals, and I/O on one die. The PIC17C family sits at the top of Microchip's legacy 8-bit portfolio: it is upward-compatible with the PIC16C5X/PIC12CXXX/PIC16CXX instruction sets and adds a 16-bit-wide program memory bus, an 8-level hardware stack, and a multiplier for higher arithmetic throughput. The PIC17C44 is the entry-point of the family with 16 KB of One-Time-Programmable (OTP) program memory and 454 bytes of general-purpose RAM. Key features include 16 KB (8K x 16) OTP program memory, 454 x 8 bits of data RAM, 33 programmable digital I/O pins, an external oscillator interface, and an extended (-40C to +125C) operating temperature range denoted by the "E" suffix. The device is built on a CMOS process and offers low power consumption typical of PIC architecture, with industry-standard peripherals including timers, a USART, and capture/compare/PWM modules. The PIC17C44-16E/L uses a Harvard architecture with a separate 16-bit program memory bus and 8-bit data bus, enabling single-cycle instruction fetch and efficient execution. The high-performance register file and 8-level deep hardware stack support fast context switching for interrupt-driven firmware. PIC17C44 firmware is supported by Microchip's MPLAB X IDE and the legacy MPASM assembler toolchain. Typical applications include industrial control systems, motor control front-ends, security and access control panels, instrumentation front-ends, and embedded control in legacy automotive subsystems. The 33 I/O lines make it well suited for keypad-scanning, LED multiplexing, and parallel bus interfaces to character LCDs. Designers migrating production from PIC17C44 should evaluate Microchip's recommendation: the PIC18F442, which provides flash memory, more peripherals, and a modern toolchain at a comparable price. When designing with this part, note that OTP memory requires programming at the factory or with a production-grade programmer; field firmware updates are not possible. Use the "E" (extended) variant only when the application truly requires -40C to +125C operation - the standard "I" industrial variant is usually sufficient and easier to source. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, with cross-references to functional equivalents in the PIC17C44 family and recommended migration paths to modern PIC18F devices.

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