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PIC16C74A-20I/L - 8-Bit 20MHz OTP MCU 7KB | Microchip
PIC16C74A-20I/L

PIC16C74A-20I/L - 8-Bit 20MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C74A-20I/L is an 8-bit CMOS RISC microcontroller in the PIC16CXX mid-range family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O lines, all housed in a 44-pin PLCC (J-Lead) package. It executes instructions at a 20 MHz clock rate with a wide operating voltage range of 2.5V to 6.0V, integrated 8-channel 8-bit A/D converter, and three timer/counters including capture/compare/PWM modules. The “-20” suffix denotes 20 MHz maximum clock speed, “I” denotes the industrial temperature range (-40°C to +85°C), and “L” designates the 44-PLCC windowed/ceramic leadless chip carrier package. An 8-bit microcontroller (MCU) is a single-chip microcomputer containing a CPU, memory, and peripherals on one die, executing instructions on 8-bit data words. Within the broader taxonomy, the PIC16C74A belongs to the mid-range 8-bit MCU category, itself part of the microcontroller family of embedded processors within the semiconductor hierarchy. OTP memory permits one-time programming during production but cannot be erased afterwards; for erasable variants, Microchip recommends the PIC16F74 Flash-based equivalent. Key features of the PIC16C74A-20I/L include high sink/source current of 25/25 mA per I/O, low-power consumption (5 µA typical standby at 3V/32 kHz, 15 µA at 5V/4 MHz), a high-performance RISC architecture with only 35 single-word instructions to learn, and all instructions execute in a single cycle except program branches (two cycles). The integrated peripherals include a synchronous serial port (SSP) for SPI/I2C, a USART for asynchronous serial communication, and a parallel slave port for external bus interfaces. The device is built on a fully-static CMOS process, allowing clock frequencies from DC up to 20 MHz without internal oscillator overhead. The 8-bit A/D converter with 8 input channels enables direct interfacing with analog sensors, while the 192-byte RAM supports small data buffers for real-time control loops. OTP program memory provides cost-effective one-time programming suitable for mature production designs. Typical applications include industrial control systems, automotive body electronics, appliance controllers, sensor signal conditioning nodes, and embedded data acquisition modules. The 33 I/O pins and integrated ADC make it particularly suitable for multi-channel sensor monitoring applications. When designing with the PIC16C74A-20I/L, verify MCLR reset circuitry and use a 1 µF decoupling capacitor on VDD within 1 cm of the device; the OTP memory cannot be field-updated, so development should use the Flash-based PIC16F74 equivalent before committing to OTP production parts. This page synthesizes distributor stock and pricing snapshots (as of 2026-09-18), drop-in compatible alternatives in the same 44-PLCC footprint, and practical design notes not found in the original 1997-vintage manufacturer datasheet.

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PIC16C74A-20I/P - 8-bit 20MHz OTP MCU 7KB | Microchip DIP-40
PIC16C74A-20I/P

PIC16C74A-20I/P - 8-bit 20MHz OTP MCU 7KB | Microchip DIP-40

The Microchip PIC16C74A-20I/P is an 8-bit RISC CMOS OTP microcontroller operating at 20 MHz, integrating 7 KB (4K x 14) of one-time-programmable program memory and 192 bytes of RAM, housed in a 40-pin PDIP through-hole package. It is part of Microchip's mid-range PIC16C7X family and provides 33 digital I/O lines, an on-chip 8-channel 8-bit A/D converter, two 8-bit timers plus one 16-bit timer, a synchronous serial port (SSP) for SPI/I2C, a USART, capture/compare/PWM (CCP) modules, and a watchdog timer. Industrial-grade -40C to +85C operation and 25/25 mA high sink/source current make it suitable for embedded control designs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one silicon die. The PIC16C7X family uses Microchip's enhanced Harvard RISC architecture with 35 single-word instructions, where all instructions execute in one cycle except program branches which take two; this streamlined instruction set reduces code size and improves deterministic interrupt response compared with CISC 8-bit MCUs. Key features include 7 KB OTP program memory (4K x 14 words), 192 bytes of SRAM data memory, an 8-channel 8-bit A/D converter, two CCP modules for PWM/capture/compare, a USART for asynchronous serial communication, and an MSSP module supporting SPI and I2C. Power consumption is 15 uA typical at 5 V / 4 MHz and 1 uA typical standby at 3 V / 32 kHz, supporting battery-backed designs. The architecture is fully static CMOS with a 14-bit instruction word, allowing DC to 20 MHz operation. With 35 single-word instructions, single-cycle execution (200 ns at 20 MHz) and a 4-cycle hardware multiplier (8 x 8 in one instruction), the PIC16C74A delivers approximately 5 MIPS throughput. The 8-bit A/D converter uses successive-approximation conversion with analog input multiplexing, allowing direct connection of sensors without external sample-and-hold. Typical applications include industrial automation controllers, motor drive PWM stages, sensor signal conditioning, instrumentation front-ends, consumer appliance controllers, and embedded communication bridges. For new designs, Microchip recommends the flash-based PIC16F74 as the modern drop-in equivalent with in-system reprogrammability. Design consideration: OTP memory means firmware is programmed once and cannot be erased - choose the PIC16F74 for prototypes or field-upgradable firmware. Ensure the MCLR reset circuit uses the recommended RC configuration per the datasheet for reliable power-on reset. This page synthesizes distributor pricing, drop-in alternatives, and engineering design guidance not always presented together in the manufacturer datasheet.

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PIC16C74A-20I/PQ - 8-Bit 20MHz 7KB OTP MCU 44-MQFP | Microchip
PIC16C74A-20I/PQ

PIC16C74A-20I/PQ - 8-Bit 20MHz 7KB OTP MCU 44-MQFP | Microchip

The Microchip Technology PIC16C74A-20I/PQ is an 8-bit CMOS RISC microcontroller from the PIC16C7X mid-range family, offering 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O lines in a 44-pin Metric QFP (MQFP 10x10) package. Operating at up to 20 MHz from a 4.0V to 6.0V supply, it integrates a 12-channel 8-bit ADC, two 8-bit timers plus one 16-bit timer/counter, a synchronous/asynchronous USART, and a 16-bit Capture/Compare/PWM (CCP) peripheral - delivering high-performance 8-bit control for embedded designs. What is a PIC mid-range microcontroller? PIC microcontrollers are RISC-based 8-bit CMOS MCUs from Microchip Technology built on a Harvard architecture that separates program and data memory. The "mid-range" PIC16 family sits between baseline PIC10/12/16 and enhanced PIC18 devices, balancing instruction density, peripheral integration, and cost. Each instruction word is 14 bits wide and most execute in a single cycle, giving 20 MHz PICs roughly 5 MIPS of throughput - ideal for motor control, instrumentation, and consumer-electronics applications. Key features include the 44-pin Metric QFP (MQFP 10x10mm) surface-mount footprint, industrial -40C to +85C temperature grade (denoted by the "I" suffix), and brown-out reset / power-on reset / watchdog timer for robust field reliability. The device is windowed-EPROM/OTP based, making it suitable for prototyping and low-to-medium volume production. Its 33 I/O pins can source/sink up to 25 mA each, sufficient for direct LED and relay drive in many control circuits. Technically, the PIC16C74A implements a 14-bit instruction set with an 8-level hardware stack, vectored interrupts, and a multiplier that performs 8x8 in one cycle. The integrated 12-channel 8-bit ADC can be used for sensor conditioning; the USART enables RS-232/RS-485 communications. Compared to its predecessor PIC16C74, the -A silicon revision adds improved ADC accuracy and an extended instruction set. Typical applications include industrial process control, sensor signal acquisition, motor drive control, automotive body electronics, security systems, and embedded instrumentation. The wide operating voltage and -40C to +85C industrial temperature range also suit HVAC controllers and machine-tool interfaces. When designing with this device, ensure adequate decoupling (100 nF per supply pin plus a 10 uF bulk capacitor), reserve a 4-pin ICP header for in-circuit programming, and confirm that your supply stays within the 4.0V to 6.0V range. Note that the part is OTP - firmware is fixed at the first programming cycle. This page synthesizes distributor availability, drop-in PIC16C74B and PIC16F74 flash-based upgrades, and practical design notes beyond what the manufacturer datasheet alone offers.

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PIC16C74AT-04/PQ - 8-Bit 4MHz OTP MCU 7KB 44-MQFP | Microchip
PIC16C74AT-04/PQ

PIC16C74AT-04/PQ - 8-Bit 4MHz OTP MCU 7KB 44-MQFP | Microchip

The Microchip Technology PIC16C74AT-04/PQ is an 8-bit RISC microcontroller from the PIC16CXX mid-range family, featuring 7 KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and a 4 MHz maximum operating frequency, housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm) package supplied on Tape & Reel. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data memory (RAM), and a set of peripheral interfaces on one die. PIC16C-series MCUs sit in Microchip's mid-range architecture hierarchy (PIC10/12/16/18 families), where they supersede the baseline PIC16C5X and are themselves superseded by the PIC18 enhanced 8-bit family. Their position in the broader taxonomy is: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. Key features of the PIC16C74AT-04/PQ include an 8-channel, 8-bit successive-approximation Analog-to-Digital Converter (ADC), 33 digital I/O lines, and serial connectivity through I2C, SPI, and UART/USART peripherals. The 04 speed grade limits the oscillator input to 4 MHz at 5 V, and the device operates across a 3.0 V to 6.0 V supply range per the PIC16C74A datasheet. The 'T' suffix denotes Tape & Reel packaging, and 'PQ' designates the 44-pin MQFP (10x10 mm) footprint. Architecturally, the PIC16C74AT-04/PQ uses a Harvard RISC core with separate program and data buses, a 14-bit wide instruction word, and a single accumulator (W register). This simplified architecture, combined with 35 single-word instructions, allows most instructions to execute in a single instruction cycle (4 oscillator clocks), giving roughly 1 MIPS of throughput at 4 MHz - adequate for control-loop, sensor-interface, and human-machine-interface applications. Typical applications include industrial process control, sensor signal conditioning, embedded control boards, instrumentation front-ends, and legacy consumer-electronics controllers. Engineers use the PIC16C74A family wherever a 5 V, 8-bit mid-range MCU with on-chip ADC and multiple serial ports is needed without paying for a flash-based MCU. Note that OTP memory requires a device programmer and cannot be reprogrammed in-circuit. When designing with this part, plan for the OTP programming model: code must be verified on a windowed or FLASH prototype part (e.g. PIC16F74A in the same 44-pin QFP) before committing to OTP production units. Always check the latest Microchip product change notifications, as the original PIC16C OTP family has been progressively migrated to PIC16F flash parts over the last decade. This page synthesizes current distributor pricing, pin-compatible alternatives, and practical design notes - information not collated in the manufacturer datasheet alone.

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PIC16C74AT-04/PT - 8-bit MCU 7KB OTP 33 I/O 4MHz TQFP44 | Microchip
PIC16C74AT-04/PT

PIC16C74AT-04/PT - 8-bit MCU 7KB OTP 33 I/O 4MHz TQFP44 | Microchip

The Microchip Technology PIC16C74AT-04/PT is an 8-bit EPROM-based CMOS microcontroller featuring 7KB of one-time-programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin TQFP (PT) surface-mount package. It operates from a 4V to 6V supply with a 4 MHz oscillator input and delivers 5 MIPS peak performance through its RISC Harvard architecture with 35 single-word instructions. Integrated peripherals include an 8-channel 8-bit Analog-to-Digital Converter (ADC), a Universal Synchronous/Asynchronous Receiver/Transmitter (USART), a Master Synchronous Serial Port (MSSP) supporting SPI and I2C, two 8-bit timers and one 16-bit timer with capture/compare/PWM, and a watchdog timer. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, and integrated peripherals. Microcontrollers sit within the broader hierarchy of: microcontroller -> embedded processor -> semiconductor IC. The PIC16C74A belongs to the PIC16 mid-range family, which uses a 14-bit instruction word and a Harvard memory architecture that separates program and data buses for deterministic execution. OTP and EPROM-based PIC16C devices were the predecessors of today's flash-based PIC16F parts, and they remain in use for legacy industrial and embedded designs where the program code is finalized in production. Key differentiating features of the PIC16C74AT-04/PT include its integrated 8-channel 8-bit ADC, dual-capture/compare/PWM modules with a 16-bit timer, and the MSSP peripheral that supports both SPI and I2C communication. The 33 I/O pins are organized across five ports (PORTA through PORTE), providing flexible mixed-signal interfacing. The 4 MHz maximum oscillator frequency is appropriate for cost-sensitive and low-power applications that do not require higher computational throughput. The TQFP-44 package with 0.80 mm pitch allows reflow soldering on standard SMT lines. Architecturally, the PIC16C74A uses an enhanced mid-range core with a hardware multiplier, an 8-level deep stack, and interrupt-driven I/O. Its EPROM program memory is one-time-programmable via a UV-erasable windowless package, allowing rapid prototyping with production-cost OTP units. The integrated brown-out detect and power-on reset reduce external component count, while the watchdog timer with on-chip RC oscillator improves field reliability. Typical applications include industrial control logic, automotive body electronics, sensor interfaces, low-end motor control, simple human-machine interfaces, and embedded data acquisition systems. The 8-bit ADC and serial peripherals suit battery chargers, HVAC controllers, and appliance controllers. Engineers commonly deploy the PIC16C74A where code stability, long-life production parts, and proven toolchains outweigh the need for higher-speed modern cores. When designing with this part, allocate the OTP programming step into the production flow: PIC16C OTP cannot be erased in-circuit. The MSSP peripheral requires careful pin remapping for SPI versus I2C modes, and the ADC reference selection (VDD or external) must be set in software before the first conversion. Pin-compatible flash-based PIC16F74A parts exist for prototyping. This page synthesizes distributor stock, parametric alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C74AT-04E/L - 8-bit 4MHz OTP MCU, 7KB, 44-PLCC | Microchip
PIC16C74AT-04E/L

PIC16C74AT-04E/L - 8-bit 4MHz OTP MCU, 7KB, 44-PLCC | Microchip

The Microchip Technology PIC16C74AT-04E/L is an 8-bit CMOS RISC microcontroller from the PIC16C7X mid-range family with 7KB One-Time Programmable (OTP) program memory, 192 bytes of RAM, and 33 general-purpose I/O pins in a 44-pin PLCC package. It operates at 4MHz from a 5V supply, integrates a multi-channel A/D converter, and provides I2C, SPI, and UART/USART serial interfaces. An 8-bit OTP microcontroller is a single-chip computer with non-volatile program memory (One-Time Programmable) that executes instructions on 8-bit wide data paths, designed for embedded control where firmware is finalized at production time and not field-updatable. PIC microcontrollers sit within the broader taxonomy: microcontroller -> embedded processor -> semiconductor -> integrated circuit; the PIC16C family represents Microchip's classic mid-range core using a Harvard architecture with separate program and data buses, optimized for deterministic interrupt response and low-power standby. Key features include 7KB (4K x 14) OTP program memory, 192 bytes of data RAM, 33 digital I/O lines, an 8-channel 8-bit A/D converter, three timer modules, a synchronous serial port (SSP) supporting SPI and I2C, and a USART for asynchronous serial communication. The device draws a typical operating current in the low milliamp range at 4MHz and supports power-managed sleep modes to extend battery life in portable designs. The PIC16C7X architecture uses a 14-bit instruction word, single-cycle execution for most instructions (excluding branches), and a hardware stack for subroutine/interrupt context saving. The integrated A/D converter is based on a successive-approximation register (SAR) topology with analog input multiplexing, enabling direct connection to sensors without an external ADC chip. Automotive-grade 'E' temperature rating extends operation from -40C to +125C. Typical applications include industrial control systems, automotive body and powertrain sub-assemblies, appliance control boards, and instrumentation front-ends. The integrated A/D converter is particularly valuable in measurement applications such as temperature monitoring, motor speed sensing, and analog signal acquisition. When designing with this MCU, note that OTP memory cannot be reprogrammed - select a Flash-based PIC16F or PIC18 equivalent for in-application firmware updates. The 44-PLCC package requires a socket or careful soldering; plan PCB layout with adequate clearance around the larger J-leaded footprint. This page synthesizes distributor pricing, drop-in alternatives, and engineering design notes not found in the manufacturer datasheet alone, providing a complete reference for engineers evaluating or sourcing the PIC16C74AT-04E/L for new designs or legacy maintenance.

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PIC16C74AT-04E/PQ - 8-Bit 4MHz OTP MCU 44-MQFP | Microchip
PIC16C74AT-04E/PQ

PIC16C74AT-04E/PQ - 8-Bit 4MHz OTP MCU 44-MQFP | Microchip

The Microchip Technology PIC16C74AT-04E/PQ is a member of the PIC16C7X mid-range family of 8-bit CMOS microcontrollers, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 x 8 bytes of SRAM, and 33 programmable I/O pins, all housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm). The device operates at a 4MHz oscillator frequency across a 4V to 6V supply range and an industrial -40C to +125C temperature window, with a maximum instruction cycle time of 250 ns at 4MHz. What is an 8-bit OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a type of embedded MCU whose program memory can be written exactly once at production or pre-production time, after which the bit pattern is permanent. Unlike flash-based MCUs, OTP parts cannot be erased or rewritten, making them cost-optimized for high-volume fixed-code applications such as appliance controllers, automotive sub-modules, and industrial sensor interfaces. The PIC16C74AT sits within the broader taxonomy of: microcontroller -> embedded controller -> semiconductor -> integrated circuit. Key feature highlights include an integrated 8-channel, 8-bit Analog-to-Digital Converter (ADC), three hardware timers (Timer0, Timer1, Timer2), a Capture/Compare/PWM (CCP) module, and a Universal Synchronous/Asynchronous Receiver-Transmitter (USART) port. Brown-out Reset, Power-on Reset, and a Watchdog Timer provide robust supply and code-flow supervision. The 4MHz maximum oscillator speed yields a 1 MIPS instruction throughput at 4MHz, sufficient for sensor sampling and motor control loops. The PIC16C74AT-04E/PQ uses Microchip's mature mid-range 14-bit instruction set with a Harvard architecture, separating program and data buses for deterministic single-cycle instruction execution. The OTP memory cell uses EPROM technology, packaged in a windowless MQFP suitable for surface-mount assembly. Typical applications include industrial control panels, HVAC actuator controllers, automotive body and comfort modules, and consumer white-goods main boards. The wide supply and temperature ranges allow use in 5V regulated industrial buses. When designing with this MCU, ensure the oscillator circuit matches the 4MHz specification and place decoupling capacitors within 5mm of each power pin. OTP memory must be programmed by a certified device programmer before final PCB assembly - field firmware updates are not possible on this part. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C74AT-04I/L - 8-Bit 4MHz OTP MCU 7KB 33 I/O | Microchip
PIC16C74AT-04I/L

PIC16C74AT-04I/L - 8-Bit 4MHz OTP MCU 7KB 33 I/O | Microchip

The Microchip Technology PIC16C74AT-04I/L is an 8-bit CMOS microcontroller from the PIC16C7X mid-range family, integrating 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O lines in a 44-pin PLCC package measuring 16.59 mm x 16.59 mm. According to Microchip distributor data, the device runs at 4 MHz maximum clock speed, is fabricated on a fully-static CMOS process, and supports an operating temperature range of -40C to +85C for industrial-grade deployments. What is a PIC16C 8-bit microcontroller? The PIC16C family is Microchip's mid-range 8-bit MCU architecture that uses a Harvard-style separate program/data bus, a RISC instruction set, and integrated peripherals such as A/D converters. PIC16C sits in the hierarchy: PIC16C -> PIC16 mid-range -> 8-bit MCU -> microcontroller -> semiconductor. OTP (One-Time-Programmable) variants are programmed once at production time and are typically used where code stability, low unit cost, and short programming lead times outweigh the need for in-field re-programmability. Key features of the PIC16C74AT-04I/L include 35 single-word instructions (most executing in a single instruction cycle except branches which take two cycles), an integrated 8-channel 8-bit A/D converter, three timer modules, a synchronous/asynchronous serial port (SSP) and a Universal Synchronous Asynchronous Receiver Transmitter (USART) for multi-protocol serial communication. The device operates from a 4V to 5.5V supply rail and provides 22 high-current I/O ports capable of directly driving LEDs and small relays. Architecturally, the PIC16C74A uses a 14-bit-wide program word and an 8-bit data path, with a hardware multiplier-free ALU optimized for low cost. The fully-static CMOS core eliminates the need for a minimum clock, allowing the MCU to be clocked down to DC for power-sensitive applications. Power-on reset, brown-out detection, watchdog timer with on-chip RC oscillator, and code protection fuses provide field-deployment robustness. Typical applications include industrial control logic boards, automotive body and chassis subsystems, appliance controllers, sensor interface front-ends, and embedded control modules where deterministic interrupt latency and proven long-term supply are critical. The PIC16C74AT-04I/L is shipped in Tape & Reel (T/R) form factor and is well suited for medium-volume production runs that require Microchip's classic mid-range toolchain (MPLAB IDE, MPASM assembler, ICD in-circuit debugging). When designing with this part, remember that OTP memory cannot be re-programmed, so production firmware must be fully validated before programming. Consider the PIC16F74 flash-based variant for prototyping and low-volume runs; consider the PIC16C74B-04I/L for enhanced silicon revisions while keeping the same 44-PLCC footprint. All variants share the same instruction set and pinout for drop-in compatibility. This page synthesizes distributor pricing, drop-in alternatives, parametric comparisons, and practical design notes not found in any single manufacturer or distributor listing - giving engineers a one-stop reference for the PIC16C74AT-04I/L.

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PIC16C74AT-04I/PQ - 8-Bit OTP MCU, 4MHz, 7KB | Microchip
PIC16C74AT-04I/PQ

PIC16C74AT-04I/PQ - 8-Bit OTP MCU, 4MHz, 7KB | Microchip

The Microchip Technology PIC16C74AT-04I/PQ is an 8-bit CMOS RISC microcontroller from the PIC16C7X mid-range family, featuring 4 MHz CPU speed, 7 KB (4K x 14) of One-Time Programmable (OTP) program memory, 192 bytes of data RAM, and 33 digital I/O pins, housed in a 44-pin MQFP (10x10 mm) package. Background Knowledge: A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and programmable I/O peripherals. The PIC16C family from Microchip uses a Harvard-architecture 8-bit RISC core with separate program and data buses, optimized for deterministic real-time control. Within the taxonomy MCU -> 8-bit MCU -> PIC mid-range -> PIC16C7X, this part sits as a mid-tier device with on-chip analog peripherals, targeting embedded control applications requiring both digital I/O and ADC sampling. Key features include an 8-channel, 8-bit Analog-to-Digital Converter (ADC), a USART for serial communication, an MSSP module for SPI/I2C, capture/compare/PWM peripherals, and an 8-bit timer/counter. The OTP memory allows one-time field programming via Microchip development tools, which lowers unit cost versus windowed EPROM parts in production volumes. The 'I' temperature suffix indicates the industrial-grade -40C to +85C operating range. Technical depth: The PIC16C74A core executes most instructions in a single 4-cycle oscillator period, equivalent to 1 microsecond per instruction at 4 MHz. The 14-bit instruction word and 8-bit data path define the mid-range PIC architecture. Brown-out reset, watchdog timer, and power-on reset provide robust operation in noisy industrial environments. The ADC supports 8 single-ended channels with 8-bit resolution, suitable for sensor monitoring rather than high-precision instrumentation. Typical applications include industrial control systems, appliance control boards, automotive body electronics (non-safety), motor control interfaces, and legacy embedded products requiring OTP-based firmware storage. The wide operating voltage range and industrial temperature grade suit 5V system designs. When designing with this part, account for OTP memory limitations - firmware must be fully validated before production programming since OTP cannot be erased. Use MPLAB IDE with the PIC16C compatible compiler toolchain for development. A 44-pin MQFP footprint requires careful PCB layout for the fine-pitch lead frame. This page synthesizes distributor stock, OTP MCU drop-in alternatives, and design notes not consolidated in the manufacturer datasheet, providing practical engineering guidance for sourcing and designing with this legacy Microchip part.

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PIC16C74AT-10/L - 8-bit OTP MCU, 10MHz, 7KB EPROM | Microchip
PIC16C74AT-10/L

PIC16C74AT-10/L - 8-bit OTP MCU, 10MHz, 7KB EPROM | Microchip

The Microchip Technology PIC16C74AT-10/L is an 8-bit RISC microcontroller from the PIC16CXX mid-range family, offered in a 44-pin PLCC (J-lead) surface-mount package with 7KB (4K x 14) of One-Time Programmable EPROM program memory and 192 bytes of RAM. It operates at a maximum clock frequency of 10MHz, is fabricated on a fully-static CMOS process, and integrates a rich set of peripherals including an 8-channel 8-bit A/D converter, two 8-bit timers plus one 16-bit timer, a USART, MSSP (SPI/I2C), capture/compare/PWM modules, and 33 digital I/O lines, all packed into the PIC16C74A die. An OTP (One-Time Programmable) microcontroller is a member of the ROM-based MCU family in which program memory can be written once during production or pre-programming and then becomes read-only at run time. OTP parts sit hierarchically below flash-based MCUs and above mask-ROM variants in the broader taxonomy: microcontroller -> embedded MCU -> ROM/OTP/Flash microcontroller -> 8-bit mid-range PIC. Compared with flash parts, OTP offers lower per-unit cost at high volumes and is favored in mature, code-stable designs where firmware revisions are no longer required. Key features of the PIC16C74AT-10/L include a wide 4.0V to 6.0V supply voltage range, an instruction cycle of 200ns at 10MHz, Harvard architecture for separate program/data buses, and industrial-grade commercial operating temperature support. The on-chip A/D converter provides eight input channels at 8-bit resolution, supporting mixed-signal applications without an external ADC. Brown-out reset, power-on reset, watchdog timer with its own on-chip RC oscillator, and code protection are also standard. The device uses the PIC mid-range 14-bit instruction set, with 35 single-cycle instructions and an 8-level deep hardware stack. Interrupt handling is fully vectored with 14 sources, and the integrated USART plus MSSP support both asynchronous serial and synchronous SPI/I2C communications, eliminating many external glue-logic components. Typical applications include industrial control, motor drive command interfaces, instrument front-panel controllers, automotive body electronics (where the automotive-grade -40C to +125C variant is selected), HVAC controls, smart sensor hubs, and embedded control subsystems in mid-complexity appliances. In particular, the 44-pin PLCC footprint and rich peripheral mix make it well-suited as a glue controller that ties analog sensors and digital actuators to a host processor. When designing with this part, observe the OTP-programming flow: code is finalized and shipped to a programmer for one-time writes before PCB assembly. Allow a 4-cycle oscillator startup window for crystal-resonator modes and ensure MCLR is properly decoupled. The commercial temperature grade is suitable for most indoor industrial enclosures; specify the I-suffix variant for extended industrial and the E-suffix for automotive-grade deployments. This page synthesizes verified distributor pricing, drop-in alternatives, and practical design guidance not found in the standalone manufacturer datasheet.

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PIC16C74AT-10/PQ - 8-bit 10MHz OTP MCU 7KB | Microchip
PIC16C74AT-10/PQ

PIC16C74AT-10/PQ - 8-bit 10MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C74AT-10/PQ is an 8-bit PIC16 mid-range RISC microcontroller operating at 10MHz with 7KB (4K x 14) One-Time Programmable (OTP) program memory and 192 bytes of RAM, housed in a 44-pin MQFP (10x10 mm) surface-mount package. It belongs to the legacy PIC16C7X family of low-cost, high-performance, fully-static CMOS microcontrollers with integrated analog peripherals. What is an 8-bit OTP microcontroller? An OTP (One-Time Programmable) MCU is a microcontroller whose program memory can be written exactly once after manufacture, typically using a parallel or serial programmer, after which the code becomes permanent. The 8-bit designation refers to the width of the ALU and the data bus, while the 10MHz rating is the maximum oscillator input frequency that drives the instruction pipeline. OTP MCUs sit in the hierarchy: microcontroller -> embedded controller -> semiconductor IC, and they are widely used in cost-sensitive, high-volume consumer and industrial products. Key features include 33 digital I/O pins, integrated 8-bit A/D converter channels, Brown-out Detect/Reset, Power-On Reset (POR), Pulse Width Modulation (PWM), Watchdog Timer (WDT), and serial connectivity through I2C, SPI, and UART/USART peripherals. The 10MHz instruction rate delivers roughly 5 MIPS, with each instruction cycle taking four oscillator clocks in the PIC mid-range architecture. The device uses a Harvard architecture with separate program and data buses, a 14-bit wide instruction word, and a RISC instruction set with only 35 single-word instructions to simplify firmware development. The CMOS process provides low power consumption with a 4V to 6V supply range (typical Vcc = 5V), making the part suitable for both battery- and line-powered embedded systems. Typical applications include industrial control boards, motor drive interfaces, instrumentation front-ends, automotive body electronics (non-safety subsystems), and legacy embedded products that were designed around the PIC16C7X family. The 44-pin MQFP footprint also simplifies migration to PIC16F74A flash-based successors when re-programmability becomes necessary. When designing with this part, note that the OTP memory prevents field firmware updates, so production firmware must be fully validated before programming. Decoupling and a stable oscillator layout are critical because the integrated A/D converter is sensitive to supply and clock noise. This page synthesizes distributor pricing, drop-in same-brand alternatives, comparison data, and practical design notes that go beyond what the original Microchip datasheet provides in isolation.

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PIC16C74AT-10/PT - 8-Bit OTP MCU, 7KB, 44-TQFP | Microchip
PIC16C74AT-10/PT

PIC16C74AT-10/PT - 8-Bit OTP MCU, 7KB, 44-TQFP | Microchip

The Microchip Technology PIC16C74AT-10/PT is an EPROM/OTP-based 8-bit CMOS microcontroller from the PIC16CXX mid-range family, supplied in a 44-pin TQFP (PT) package and rated for 10 MHz operation (approximately 5 MIPS). It integrates 4K x 14 words (7 KB) of one-time programmable program memory, 192 bytes of user RAM, 33 digital I/O lines, and a multi-channel analog-to-digital converter, making it a single-chip solution for embedded control. An 8-bit OTP microcontroller is a microcontroller whose program memory can be written once by the user using an appropriate programmer and then becomes read-only - ideal for low- to mid-volume production where mask-ROM economics are not justified. The PIC16C74A belongs to Microchip's PIC16CXX mid-range architecture, which sits hierarchically under RISC microcontroller -> microcontroller unit (MCU) -> embedded controller -> semiconductor. The advanced RISC Harvard architecture and 35 single-word instruction set deliver deterministic, mostly single-cycle execution. Key features include 4096 x 14-bit OTP program memory, 192 bytes of RAM, 33 I/O pins shared with peripherals, an on-chip 8-bit A/D converter, two 8-bit and one 16-bit timer/counters, a synchronous/asynchronous serial port (USART/SCI), a parallel slave port, and a watchdog timer with on-chip RC oscillator for reliable operation. The 10 MHz oscillator input yields roughly 5 MIPS sustained throughput. Typical applications span industrial automation controllers, consumer-electronics user-interface boards, automotive body and convenience subsystems (pre-CAN generations), appliance control boards, and low-cost data-acquisition front-ends. Wide third-party and reference code availability for the PIC16C family accelerates time-to-market in cost-sensitive designs. When designing in this part, remember that OTP memory cannot be reprogrammed in-circuit; plan for code-stable prototypes before committing to masked-volume production. Ensure decoupling capacitors are placed within a few millimeters of VDD/VSS pins and respect the oscillator start-up timing during in-system programming.

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PIC16C74AT-10E/PQ - 8-Bit 10MHz 7KB OTP MCU 44-QFP | Microchip
PIC16C74AT-10E/PQ

PIC16C74AT-10E/PQ - 8-Bit 10MHz 7KB OTP MCU 44-QFP | Microchip

The Microchip Technology PIC16C74AT-10E/PQ is a high-performance 8-bit CMOS RISC microcontroller in the PIC16CXX mid-range family, featuring 7KB (4K x 14) of One-Time-Programmable (OTP) program memory, 192 bytes of user RAM, and 33 programmable digital I/O lines, all housed in a 44-pin QFP (MQFP) package. The device integrates an 8-channel 8-bit Analog-to-Digital Converter (ADC), two Capture/Compare/PWM (CCP) modules, a Universal Synchronous/Asynchronous Receiver/Transmitter (USART), and a Synchronous Serial Port (SSP) supporting SPI and I2C, with a maximum clock frequency of 10 MHz delivering 5 MIPS of processing throughput. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data RAM, I/O peripherals, and timers onto one silicon die. The PIC16C74AT belongs to the PIC16C7X sub-family, which is part of Microchip's mid-range PICmicro architecture that uses a 14-bit instruction word and Harvard-style separate program/data buses. Compared with 4-bit or 16-bit alternatives, 8-bit MCUs remain the workhorse for cost-sensitive embedded control in industrial and automotive subsystems, and they sit within the broader semiconductor hierarchy of microcontrollers > microprocessors > integrated circuits. The PIC16C74AT-10E/PQ features an operating voltage range of 4.0 V to 6.0 V, brown-out reset (BOR) circuitry, a watchdog timer with its own on-chip RC oscillator, an 8 x 8 hardware multiply, and four oscillator start-up timer options. The integrated ADC supports eight analog input channels with 8-bit resolution, suitable for sensor interfacing. Its three timer modules (Timer0, Timer1, Timer2) plus two CCP modules provide flexible event timing and PWM generation for motor and lighting control. Typical applications for the PIC16C74AT-10E/PQ include industrial process controllers, automotive body and chassis ECUs, smart sensor signal conditioning nodes, HVAC control boards, and white-goods appliance controllers. The wide I/O count (33) and integrated peripherals make it well-suited for multi-channel data-acquisition designs where cost per I/O matters more than raw CPU throughput. Engineers designing replacement boards for legacy systems particularly favor this part because the PIC16C7X instruction set and toolchain are well-documented and supported by MPLAB IDE. When selecting this part, note the automotive "E" temperature grade (-40 C to +125 C) and 10 MHz speed grade: the 10 MHz part is the lower-speed variant of the PIC16C74A family (which also has a 20 MHz option). The -E/PQ suffix decodes to Enhanced (extended) temp grade, PQ = 44-pin Metric Quad Flat Pack. Because this is an OTP (one-time-programmable) part, firmware must be fully verified before programming; consider the PIC16F74A flash equivalent if in-field reprogrammability is required.

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PIC16C74AT-10E/PT - 8-Bit 10MHz 7KB OTP MCU | Microchip
PIC16C74AT-10E/PT

PIC16C74AT-10E/PT - 8-Bit 10MHz 7KB OTP MCU | Microchip

The Microchip Technology PIC16C74AT-10E/PT is an 8-bit CMOS RISC microcontroller from the PIC16C7X mid-range family, delivering 10 MIPS performance from a 10MHz oscillator and housed in a 44-pin TQFP (10x10 mm) package. It integrates 7KB (4K x 14) of One-Time Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins, making it a drop-in member of the PIC16C74A family. Background: The PIC16C family is a classic mid-range 8-bit RISC microcontroller architecture from Microchip Technology (originally Microchip Technology / General Instrument). An OTP microcontroller is a flash-less variant in which the program memory can be written exactly once by the user, typically using an external device programmer. Compared to flash-based MCUs, OTP parts offer lower unit cost, smaller die area, and stronger bit stability, which is why they remain common in high-volume appliance, automotive, and industrial control applications. Key features include a 14-bit instruction word, 8-level deep hardware stack, integrated 8-channel 8-bit A/D converter, two 8-bit and one 16-bit timer/counter modules, a Universal Synchronous Asynchronous Receiver Transmitter (USART), a Synchronous Serial Port (SSP), and capture/compare/PWM (CCP) peripherals. The device operates from 4.0V to 6.0V and supports a -40C to +125C extended temperature range, indicated by the "E" temperature designator in the part number. The PIC16C74A core uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand read to occur in a single 200ns instruction cycle (at 20MHz, equivalent to 10MHz oscillator/4). This dual-pipeline structure gives the PIC16C74AT-10E a 200ns instruction cycle and deterministic interrupt latency, which is essential for closed-loop control loops and motor drive timing. Typical applications include industrial process control, HVAC thermostat and sensor interfacing, motor drive BLDC/PMSM auxiliary logic, automotive body electronics (cluster, lighting, window lift), white-goods user-interface boards, and general-purpose embedded control. The "-10E" suffix denotes 10MHz max oscillator frequency and the extended temperature grade, while "T" indicates tape-and-reel packaging and "/PT" indicates the 44-pin TQFP. When designing with this part, note that OTP memory requires device programmers for code loading - in-circuit programming via ICSP is not supported on C-series OTP parts. Plan for a single revision code image in production or select the PIC16F74A flash counterpart if field re-programmability is required. This page synthesizes Microchip and distributor data, drop-in alternatives in the 44-TQFP footprint, and design notes not consolidated in the manufacturer datasheet.

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PIC16C74AT-10I/L - 8-bit OTP MCU 7KB 192 RAM 33 I/O | Microchip
PIC16C74AT-10I/L

PIC16C74AT-10I/L - 8-bit OTP MCU 7KB 192 RAM 33 I/O | Microchip

The Microchip Technology PIC16C74AT-10I/L is an 8-bit PIC16C-family CMOS RISC microcontroller in a 44-pin PLCC (J-lead) package, supplied on tape and reel. It integrates 7 KB of one-time-programmable (OTP) program memory (4K x 14), 192 bytes of SRAM, 33 digital I/O pins, and runs at a maximum clock rate of 10 MHz. It operates from 4 V to 6 V and is offered in the -40 C to +85 C industrial temperature grade. What is an 8-bit OTP microcontroller? It is a single-chip microcomputer built around an 8-bit data path that executes instructions stored in one-time-programmable non-volatile memory. OTP means the program memory can be written once at production time and is then permanently retained, making these parts a cost-effective choice for high-volume, fixed-function embedded products. Within the broader component taxonomy, this part belongs to microcontroller -> 8-bit MCU -> PIC16 family -> mid-range MCU -> CMOS RISC processor -> semiconductor IC. Key features of the PIC16C74AT-10I/L include the PIC16C mid-range Harvard RISC core with a 14-bit instruction word, an integrated analog-to-digital converter (per the PIC16C7X family definition), multiple timers, a USART, and synchronous/Asynchronous serial port support. The 33 I/O pins can source/sink up to 25 mA per pin, enabling direct drive of LEDs and small relays. The 44-PLCC package is a J-leaded surface-mount format with a 16.59 x 16.59 mm body. Technically, the PIC16C7X family uses a two-stage pipeline, single-cycle instruction execution (excluding branches), and a hardware multiplier-free ALU, which simplifies instruction decoding and keeps dynamic current low. The 192-byte RAM is shared with a 16-deep hardware stack and Special Function Registers (SFRs), and the 7 KB OTP supports in-system programming via Microchip's standard ICSP protocol. Typical applications include industrial automation controllers, automotive body and chassis subsystems, appliance control boards, instrumentation front-ends, and consumer electronics embedded control. The wide operating voltage (4 V to 6 V) and industrial temperature range make it well-suited for harsh-environment embedded designs. When designing with this part, note that OTP memory cannot be erased; prototypes should use the windowed (JW) or flash-based (PIC16F) equivalent. Plan firmware revisions accordingly, and allocate the 33 I/Os against the requirements of the application early in the design. This page synthesizes real distributor pricing, verified drop-in alternatives, and practical design notes that the bare datasheet does not surface in one place.

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PIC16C74AT-10I/PQ - 8-Bit 10MHz 7KB OTP MCU | Microchip Technology
PIC16C74AT-10I/PQ

PIC16C74AT-10I/PQ - 8-Bit 10MHz 7KB OTP MCU | Microchip Technology

The Microchip Technology PIC16C74AT-10I/PQ is a member of the PIC16C7X family of low-cost, high-performance CMOS fully-static 8-bit microcontrollers fabricated in OTP (One-Time-Programmable) technology with 7KB (4K x 14) of program memory. The device operates at 10MHz and is housed in a 44-pin MQFP (PQ) plastic package measuring 10x10 mm, with 192 bytes of RAM and 33 digital I/O pins. The "I" suffix indicates the industrial temperature grade range of -40C to +85C, and the "T" suffix indicates tape-and-reel packaging for SMT assembly. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one IC. The PIC16C7X mid-range family sits in the PIC16/17 RISC architecture taxonomy (PIC -> microcontroller -> 8-bit MCU -> embedded controller) and uses a 14-bit instruction word to deliver deterministic single-cycle execution on most instructions, balancing code density against performance for embedded control tasks. Key features of the PIC16C74AT-10I/PQ include five 8-bit I/O ports (PORTA-PORTE) providing 33 bidirectional digital I/O lines, three timer/counter modules for event timing and PWM generation, two capture/compare/PWM (CCP) modules, an 8-channel 8-bit analog-to-digital converter (ADC), a USART serial port with addressable 9-bit mode, and a synchronous serial port (SSP) supporting SPI and I2C master/slave modes. The interrupt controller supports 15 sources including external RB0/INT, peripheral interrupts, and a 16-bit/8-bit/1-bit timer overflow chain. The PIC16C74A uses a Harvard architecture with separate program and data buses, a 2-stage pipeline, and 4MHz internal oscillator option with selectable oscillator modes (RC, XT, HS, LP) to trade off power versus frequency. Brown-out reset and a watchdog timer with on-chip RC oscillator are integrated for automotive-grade robustness in industrial and consumer applications. Typical applications include industrial process control, instrumentation, motor control, sensor interfacing, and consumer appliances requiring multi-channel ADC sampling with serial communications. The device also targets instrumentation data loggers and HVAC controllers. When designing with this MCU, allocate ample decoupling (100nF + 10uF bulk) close to VDD/AVDD/VSS and configure the configuration bits (oscillator, watchdog, brown-out) before code execution begins to prevent unintended reset states.

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PIC16C74AT-10I/PT - 8-bit OTP MCU, 7KB, 33 I/O | Microchip
PIC16C74AT-10I/PT

PIC16C74AT-10I/PT - 8-bit OTP MCU, 7KB, 33 I/O | Microchip

The Microchip Technology PIC16C74AT-10I/PT is an 8-bit EPROM/OTP-based CMOS microcontroller with 7KB of program memory and 192 bytes of RAM, housed in a 44-pin TQFP package. It belongs to the PIC16C7X mid-range family and operates from a 4V to 6V supply at up to 10 MHz instruction rate, delivering 5 MIPS performance. The part offers 33 digital I/O pins, an integrated multi-channel Analog-to-Digital Converter, USART, MSSP (SPI/I2C), and two CCP modules, all on a RISC architecture with only 35 single-word instructions. A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, working RAM, and integrated peripherals such as timers, communication interfaces, and analog-to-digital converters. The PIC16C7X family sits within Microchip's mid-range 8-bit line, which evolved from the original PIC16C baseline. PIC microcontrollers are widely used in embedded control because of their deterministic instruction set, low power consumption, and ease of programming through Microchip's MPLAB X toolchain and the familiar PICkit and ICD programmers. Key features of the PIC16C74AT-10I/PT include its 7KB one-time-programmable (OTP) program memory allowing prototype and small-volume production runs without an EEPROM/Flash step, 192 bytes of data RAM, 33 I/O pins arranged across multiple ports, an integrated ADC, and USART plus MSSP for asynchronous serial and SPI/I2C synchronous communications. Two Capture/Compare/PWM modules are included for timing and motor-control tasks, while 8K x 14-bit instruction-word width makes the part code-efficient for mid-range control applications. The industrial temperature grade (-40C to +85C) and TQFP-44 surface-mount package support compact, factory-floor designs. Architecturally, the PIC16C74A uses a Harvard RISC core with separate program and data buses, an 8-level deep hardware stack, and direct, indirect, and relative addressing modes. The ADC is a successive-approximation 8-bit converter with multiple input channels multiplexed onto the I/O pins. The IC operates fully statically, meaning the clock can be stopped without losing register state, enabling low-power sleep modes useful for battery-backed or polled sensor designs. Typical applications include industrial automation and motor-control boards, automotive body and HVAC subsystems (for equivalent Flash parts in the PIC16F family), consumer appliance controls such as washing machines and microwave ovens, and embedded instrumentation requiring UART or I2C communication with analog sensing. In all these roles, the PIC16C74A's combination of ADC, PWM, and serial peripherals reduces external component count. When designing with this part, note that OTP memory requires windowed/UV-erase or one-time programming; for in-system reprogrammability, consider Flash-based siblings in the PIC16F74 family with the same pinout. Always place a 0.1uF decoupling capacitor close to VDD and a bulk capacitor near the analog AVdd pin to keep ADC readings clean. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C74AT-20/PQ - 8-Bit 20MHz MCU, 7KB OTP, 44-MQFP | Microchip
PIC16C74AT-20/PQ

PIC16C74AT-20/PQ - 8-Bit 20MHz MCU, 7KB OTP, 44-MQFP | Microchip

The Microchip PIC16C74AT-20/PQ is an 8-bit CMOS RISC microcontroller from the PIC16C7X mid-range family, offering 20 MHz maximum operating frequency, 7 KB (4K x 14) of One-Time Programmable (OTP) program memory, and 192 bytes of RAM in a 44-pin Metric MQFP (PQ) surface-mount package supplied on Tape & Reel. It integrates an 8-channel, 8-bit A/D converter, three timer modules, two capture/compare/PWM modules, a synchronous serial port (SSP) configurable as SPI or I2C, a USART with on-chip baud-rate generator, a parallel slave port, and up to 33 digital I/O lines. What is a PIC16C7X mid-range microcontroller? The PIC16C7X family is a group of low-cost, high-performance, CMOS, fully-static 8-bit microcontrollers built on Microchip's enhanced mid-range RISC core. They sit within the broader PIC16CXX mid-range architecture family, which itself belongs to the PICmicro family of microcontrollers, and ultimately the 8-bit microcontroller category. The mid-range architecture provides 35 single-cycle instructions, a 14-bit instruction word, a hardware multiplier, and integrated analog peripherals that make these MCUs a popular choice for embedded control applications requiring deterministic timing and mixed-signal I/O. Key differentiating features of the PIC16C74AT-20/PQ include its commercial temperature grade (0 °C to +70 °C), 20 MHz clock input that delivers up to 5 MIPS throughput, an integrated brown-out reset (BOR) circuit, a watchdog timer with its own on-chip RC oscillator, and a programmable code-protection mechanism. The 'T' suffix indicates Tape & Reel packaging, and the '/PQ' suffix denotes the 44-pin Metric Quad Flat Pack (MQFP) package at 10 x 10 mm body size. The OTP memory variant supports prototyping and low-volume production where in-system programmability is not required. This device is implemented in a low-power CMOS process with a typical active supply current of approximately 5 mA at 5 V and 20 MHz, plus sub-µA sleep current for battery-friendly standby. It supports 8-bit-wide parallel slave porting for external bus expansion, two analog comparators, and a 256-byte EEPROM data area on most family variants. Compared to flash-based PIC16F7X siblings, the PIC16C74A is OTP-only, making it more cost-effective in mature, code-stable high-volume products. Typical applications for the PIC16C74AT-20/PQ include industrial control systems, automotive body electronics (where similar PIC16C variants are used), HVAC controller boards, security alarm panels, smart sensor hubs, and appliance motor control boards. It also fits low-cost data acquisition front-ends where its on-chip 8-channel ADC simplifies mixed-signal front-end design. A key design consideration for the PIC16C74AT-20/PQ is OTP memory: once programmed, the code cannot be erased or rewritten. Engineers should plan development on a windowed (JW) or flash (F) variant of the same PIC16C74A silicon and migrate to the OTP PIC16C74AT-20/PQ only after firmware is fully validated. Brown-out reset, watchdog timer configuration, and oscillator selection (XT, HS, RC) must be set via configuration fuse bits before programming. This page synthesizes verified distributor pricing from DigiKey, parametric comparison against drop-in same-package alternatives from the PIC16C7X family, lifecycle context (this is an OTP/EOL-family part), and practical PCB layout notes that go beyond the bare datasheet summary, giving engineers a faster procurement and redesign decision.

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PIC16C74AT-20/PT - 8-Bit 20MHz OTP MCU 7KB | Microchip
PIC16C74AT-20/PT

PIC16C74AT-20/PT - 8-Bit 20MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C74AT-20/PT is an 8-bit EPROM-based (OTP) microcontroller from the PIC16C7X family, operating at up to 20 MHz with 5 MIPS performance in a 44-pin TQFP (10x10 mm) package. It integrates 7 KB (4K x 14) of one-time programmable program memory, 192 bytes of user RAM, and 33 digital I/O lines, and is fabricated on a fully-static CMOS process. Background knowledge: An 8-bit microcontroller (MCU) is a small computer-on-a-chip that combines a CPU, program memory, RAM, and peripherals in a single package. The PIC16C7X family belongs to Microchip's mid-range PIC architecture, sitting between base-line PIC16C5X devices and enhanced PIC17/18 devices. Within the taxonomy MCU -> microcontroller -> embedded processor -> semiconductor, PIC16C7X parts are commonly used for cost-sensitive control applications where deterministic instruction execution and low external component count are priorities. The OTP suffix ('C') denotes EPROM-based one-time programmable memory, which is field-programmable but not electrically erasable, distinguishing it from flash-based PIC16F variants. Key features include an integrated 8-channel, 8-bit analog-to-digital converter, three timer modules, a synchronous serial port (SSP) supporting SPI and I2C, a USART with addressable transmit/receive buffer, a parallel slave port, and a watchdog timer with on-chip RC oscillator. The device operates from 4.0 V to 6.0 V across the commercial 0C to +70C temperature range and supports in-circuit serial programming (ICSP) via two pins. Architecturally, the PIC16C7X employs a 14-bit instruction word with a single accumulator (W) and an 8-level deep hardware stack, allowing 35 single-word instructions and an instruction cycle equal to four oscillator periods. Brown-out reset, power-on reset, and a wide operating voltage range further improve field robustness. The 20 MHz clock delivers 5 MIPS throughput, sufficient for closed-loop control and modest signal-processing tasks. Typical applications include industrial automation controllers, automotive body and accessory modules (non-safety), consumer appliance control boards, sensor signal conditioning, and small motor-control subsystems. The integrated ADC and USART simplify designs that must interface with analog sensors and asynchronous serial buses. When designing with this part, note that the OTP memory cannot be reprogrammed in-circuit; engineering samples should use the windowed (JW) variant for development. Decoupling the VDD/VSS pairs close to the package and following Microchip's recommended oscillator layout are critical for EMI-sensitive environments. This page synthesizes distributor pricing, pin-compatible family alternatives, and practical design considerations that extend beyond the manufacturer datasheet to accelerate sourcing and design decisions.

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PIC16C74AT-20E/PQ - 8-bit 20MHz OTP MCU 7KB | Microchip
PIC16C74AT-20E/PQ

PIC16C74AT-20E/PQ - 8-bit 20MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C74AT-20E/PQ is an 8-bit CMOS RISC microcontroller from the PIC16C7X mid-range family, operating at up to 20MHz with 7KB of One-Time Programmable (OTP) program memory organized as 4K x 14 words and 192 bytes of RAM, housed in a 44-pin MQFP (10x10 mm) package. The 'T' suffix denotes tape-and-reel packaging, the '20' indicates the 20MHz maximum clock speed, the 'E' denotes the extended industrial temperature grade (-40C to +125C), and 'PQ' identifies the 44-pin MQFP package. What is a PIC microcontroller? A PIC (Peripheral Interface Controller) microcontroller is a family of low-cost, high-performance, CMOS, fully-static, 8-bit microcontrollers built on a RISC (Reduced Instruction Set Computer) architecture. PIC microcontrollers fall within the broader category of microcontrollers (MCU) which sit inside the integrated circuits > microcontrollers taxonomy. PIC16C-series parts are part of Microchip's mid-range MCU family that integrates on-chip peripherals such as A/D converters, timers, and serial communication interfaces in a single chip, simplifying embedded designs. Key features of the PIC16C74AT-20E/PQ include: integrated 8-channel 8-bit A/D converter, three timers (Timer0, Timer1, Timer2), a capture/compare/PWM (CCP) module, and three serial communication peripherals - I2C, SPI, and USART - enabling flexible connectivity to analog sensors and digital peripherals. The wide operating voltage range of 2.5V to 5.5V supports both 3.3V and 5V system designs, and 33 digital I/O pins provide ample GPIO for typical embedded applications. From an architectural standpoint, the PIC16C7X family uses a Harvard architecture with separate program and data buses, allowing instruction fetch and data access in a single cycle. The 14-bit instruction word enables a rich set of single-cycle operations including bit manipulation, byte arithmetic, and conditional branches. The OTP program memory means firmware is programmed once at production and cannot be erased, which is well-suited for mature, fixed-function products with stable firmware. Typical applications include industrial automation controllers, automotive body and chassis subsystems, motor control boards, sensor interface modules, HVAC controllers, and consumer appliance control boards. The combination of integrated A/D converters and serial interfaces allows designers to replace external glue logic with a single chip. When designing with this part, ensure the oscillator configuration (crystal/RC/HS mode) matches your clock-accuracy requirements. The 'E' extended temperature grade makes it suitable for under-hood automotive and outdoor industrial deployments. Note that OTP memory cannot be re-programmed - use Flash-based PIC16F74 for in-field firmware updates. This page synthesizes verified distributor pricing, drop-in same-package alternatives, MQFP-44 pinout diagrams, and practical design considerations that go beyond what a single manufacturer datasheet provides, helping engineers make informed selection and sourcing decisions for the PIC16C74AT-20E/PQ.

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PIC16C74AT-20I/L - 8-bit 20MHz PIC MCU, 7KB OTP, 44-PLCC | Microchip
PIC16C74AT-20I/L

PIC16C74AT-20I/L - 8-bit 20MHz PIC MCU, 7KB OTP, 44-PLCC | Microchip

The Microchip Technology PIC16C74AT-20I/L is an 8-bit PIC microcontroller built on Microchip's mid-range RISC architecture, offering a 20 MHz maximum operating frequency, 7 KB (4K x 14) of One-Time-Programmable (OTP) program memory, and 192 bytes of RAM, all housed in a 44-pin PLCC package (16.59 x 16.59 mm). What is a PIC 16C microcontroller? PIC 16C devices are members of Microchip's classic mid-range 8-bit microcontroller family, fully static CMOS designs that integrate a RISC CPU core, program memory, data RAM, and a rich set of on-chip peripherals around a unified instruction set. They sit in the broader hierarchy of PIC microcontrollers -> 8-bit microcontrollers -> microcontrollers (MCU) -> microcontrollers and processors -> semiconductors. The "16C" prefix denotes EPROM-based (erasable windowed) program memory, while PIC16F variants use flash; PIC16C parts are typically used where traceability, in-circuit reprogrammability in a windowed package, or long-term reliability validation of the OTP silicon is required. Key features of the PIC16C74AT-20I/L include 33 general-purpose digital I/O pins, an 8-channel 8-bit Analog-to-Digital Converter (ADC), two Capture/Compare/PWM (CCP) modules, an asynchronous/synchronous USART with address masking, a Master Synchronous Serial Port (MSSP) supporting both I2C (Master/Slave) and SPI modes, and a Parallel Slave Port. System integrity features include a Brown-Out Reset (BOR), Power-On Reset (POR), a Watchdog Timer (WDT) with its own on-chip RC oscillator, and dual oscillator options (XT/HS/RC/LP). The "-20I" suffix indicates a 20 MHz speed grade and an industrial temperature range of -40C to +85C. The PIC16C74AT-20I/L uses a Harvard architecture with a separate 14-bit instruction word and 8-bit data path, executing most instructions in a single 200 ns cycle (at 20 MHz). The wide operating voltage range of 4.0 V to 6.0 V supports both 5 V regulated rails and battery-backed systems, while the high sink/source current of 25 mA per I/O pin enables direct LED or relay drive without external buffers. Typical applications include industrial process control, motor control front-ends, instrumentation, automotive body electronics (non-safety), and embedded control in white goods and HVAC subsystems. The on-chip ADC, CCP/PWM and MSSP peripherals make it well suited to closed-loop control systems where deterministic instruction timing and integrated analog simplify the BOM. When designing with this part, confirm that OTP program memory matches the production flow - OTP can be programmed only once and is unsuitable for designs that require firmware updates. Designers targeting long life-cycles should evaluate the flash-based PIC16F74A family or the migration path documented in Microchip device migration guides. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C74AT-20I/PQ - 8-Bit 20MHz OTP MCU, 7KB | Microchip
PIC16C74AT-20I/PQ

PIC16C74AT-20I/PQ - 8-Bit 20MHz OTP MCU, 7KB | Microchip

The Microchip Technology PIC16C74AT-20I/PQ is an 8-bit PIC microcontroller from the PIC16C7X mid-range family, built on a fully-static CMOS process and packaged in a 44-pin MQFP (10x10 mm). It integrates a 20 MHz core, 7 KB of one-time-programmable (OTP) program memory organized as 4K x 14, 192 bytes of RAM, 33 digital I/O lines, and on-chip peripherals including an analog-to-digital converter and synchronous/asynchronous serial interfaces (SSP/USART). The "T" suffix denotes tape-and-reel packaging, "20" indicates the 20 MHz maximum operating frequency, "I" denotes the industrial -40C to +85C temperature grade, and "/PQ" identifies the 44-pin MQFP package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral blocks around a Harvard architecture bus. The PIC16C7X family is the mid-range tier of Microchip's classic PIC line, sitting between the baseline PIC16C5X and the high-performance PIC17C/PIC18C families. PIC MCUs are characterized by their RISC instruction set, single-cycle execution at the oscillator rate, and predictable interrupt latency, which has made them a long-standing choice for embedded control in industrial, automotive, and consumer products. Key features include 13 interrupt sources, a 200 ns instruction cycle at 20 MHz, an 8-level deep hardware stack, and a watchdog timer with its own on-chip RC oscillator for fail-safe recovery. The device supports in-circuit serial programming (ICSP) via RB6/RB7, allowing the OTP memory to be programmed after PCB assembly. The brown-out reset and power-on reset blocks protect the controller during supply transients in harsh industrial environments. The architecture uses a 14-bit instruction word with separate code and data buses, enabling simultaneous instruction fetch and data access for deterministic throughput. The ADC block provides 8 inputs with 8-bit resolution, and the capture/compare/PWM module supports timing-critical motor and power-conversion applications. The 33 I/O pins feature high-current sink/source capability for direct LED and relay drive. Typical applications include industrial control panels, sensor signal conditioning, motor drive interface, embedded instrumentation, and legacy replacement designs migrating from PIC16C5X baselines. The industrial temperature range and OTP memory make it well-suited for cost-sensitive volume production where firmware is finalized at board build time. When designing with this device, remember that OTP memory cannot be re-programmed in the field; for development and low-volume production consider the PIC16F74 flash equivalent. The 44-MQFP package requires careful thermal management at high clock rates, and decoupling capacitors must be placed within 5 mm of the VDD pins per the Microchip datasheet. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C74AT-20I/PT - 8-Bit 20MHz OTP MCU 7KB | Microchip
PIC16C74AT-20I/PT

PIC16C74AT-20I/PT - 8-Bit 20MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C74AT-20I/PT is a member of the PIC16C7X mid-range 8-bit microcontroller family, integrating an 8-channel Analog-to-Digital Converter with 7KB (4K x 14) of One-Time Programmable (OTP) program memory, 192 bytes of user RAM, and a 20MHz maximum operating frequency delivering 5 MIPS of CPU throughput. Housed in a 44-pin TQFP (PT) package (10x10mm body) with the industrial -40C to +85C operating temperature range, the PIC16C74AT-20I/PT provides 33 digital I/O lines, three timer modules, two capture/compare/PWM peripherals, a USART, and the synchronous serial port that defines this family. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, typically integrating a CPU core, program memory (ROM/OTP/Flash), working RAM, and a mix of peripherals (timers, ADC, communication ports, GPIO). PIC microcontrollers from Microchip Technology are RISC-based Harvard-architecture devices with a small instruction set (35 single-word instructions on the mid-range family) that simplifies coding while still offering deterministic real-time performance. PIC16C parts sit in the mid-range PIC taxonomy: PIC10/12/16/18 (8-bit) -> PIC16F/PIC16C mid-range family -> PIC16C7X sub-family (with integrated ADC). This hierarchy matters because selecting within the same family guarantees pinout, peripheral set, and instruction-set compatibility. Key differentiating features include the integrated 8-bit ADC, hardware USART for RS-232/RS-485 links, dual CCP modules for PWM or input-capture timing, and a synchronous serial port that can be configured for SPI or I2C master mode. The OTP memory allows short programming lead time for prototype builds but is single-write only, so engineers should plan migration to a Flash-based PIC16F or PIC18 equivalent for production volumes. At the architectural level the PIC16C74A uses a 14-bit instruction word and separate program/data buses, allowing the CPU to fetch an instruction while simultaneously reading data memory - the canonical Harvard advantage. Power management is handled by selectable oscillator modes (XT, HS, RC, LP) and a power-saving SLEEP state with multiple wake-up sources including the Watchdog Timer. Typical applications include industrial control boards, appliance controllers, automotive body electronics (pre-CAN modules), sensor signal conditioning with on-chip ADC, and small motor-control loops leveraging the CCP/PWM peripherals. The wide industrial temperature range makes the -I grade suitable for factory-floor equipment. When designing with this part, plan OTP programming workflow early - the device cannot be re-programmed and the same silicon is unavailable in Flash. The TQFP-44 footprint is shared with PIC16F874/877 Flash equivalents that are drop-in code-and-pin compatible, easing migration paths. This page synthesizes distributor pricing snapshots, drop-in compatible Microchip alternatives (PIC16C74AT-20I/PQ, PIC16C74AT-20/PT, PIC16C74A-20I/L), and practical design considerations not found in the manufacturer datasheet.

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PIC16C74B-04/L - 8-Bit OTP MCU 7KB 4MHz 33 I/O PLCC-44 | Microchip
PIC16C74B-04/L

PIC16C74B-04/L - 8-Bit OTP MCU 7KB 4MHz 33 I/O PLCC-44 | Microchip

The Microchip Technology PIC16C74B-04/L is an 8-bit CMOS RISC microcontroller in the PIC16CXX mid-range family, supplied in a 44-pin PLCC package with 7KB (4K x 14) of One-Time Programmable (OTP) program memory. It operates from a 4 MHz external clock input (the -04 speed grade), runs an instruction in 200 ns, supports a 4V to 5.5V supply, and exposes 33 digital I/O lines plus 8 channels of 8-bit Analog-to-Digital conversion. An OTP microcontroller is a type of non-volatile programmable logic device whose program memory can be written exactly once after manufacture, retaining its code without power and offering lower per-unit cost than ceramic-windowed UV erasable parts for production runs. The PIC16C74B-04/L sits in the broader taxonomy: microcontroller -> 8-bit MCU -> mid-range RISC MCU -> CMOS embedded controller -> semiconductor, where it bridges simple 8-pin PIC10/12 devices and the 16-bit PIC24/dsPIC families. This positioning explains its adoption in industrial control, automotive body electronics and legacy embedded designs. Key features include 192 bytes of data RAM, two 8-bit timers plus one 16-bit timer, a 5-channel 8-bit A/D converter with brown-out reset and a watchdog timer. The synchronous serial port can be configured as either a 3-wire SPI or 2-wire I2C interface, and a separate USART provides asynchronous serial communication. An 8-level deep hardware stack and 35 single-word RISC instructions reduce code density and ease firmware development for legacy C and assembly projects. The architecture implements a Harvard-style memory map with separate code and data buses, allowing instruction fetch and operand read to occur in a single clock cycle for most instructions. Program branches are two cycles; everything else executes in one cycle. The OTP program memory is implemented as EPROM cells, giving deterministic in-system programming via the standard Microchip ICSP protocol. Brown-out reset, power-on reset and the watchdog timer provide three independent reset sources that harden the device against brown-out and software-stall conditions in unattended equipment. Typical applications include industrial control logic, automotive body and chassis subsystems (pre-CAN era platforms), appliance controllers, security and access-control panels, and legacy communication peripherals requiring USART plus SPI or I2C on the same silicon. The wide 4V-5.5V operating range tolerates unregulated 5V supplies common in industrial cabinets. When designing with this device, plan the OTP programming flow early because the part cannot be reprogrammed in-circuit after the UV window is sealed. Place a 100 nF decoupling capacitor close to VDD and VSS, and reserve the MCLR pin for the standard Microchip ICSP header so production programming and field firmware recovery remain practical. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the standalone PIC16C74B datasheet.

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