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PIC16C65AT-04E/PT

PIC16C65AT-04E/PT - 8-bit OTP MCU, 7KB, 33 I/O, 4MHz | Microchip

The Microchip Technology PIC16C65AT-04E/PT is a one-time-programmable (OTP) 8-bit RISC microcontroller from the PIC16CXX family, featuring 7 KB (4K x 14) of program memory, 192 bytes of SRAM, and 33 digital I/O pins, housed in a 44-pin TQFP (PT) surface-mount package. The part runs from a 4 MHz external oscillator, supports a 5 V supply rail, and is qualified for the -40C to +125C extended industrial operating range, indicated by the "E" temperature designator. What is an 8-bit OTP microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, peripherals, and I/O. OTP (One-Time Programmable) memory can be written once via a device programmer and cannot be erased, making OTP MCUs a cost-optimized choice for high-volume, fixed-function products. The PIC16CXX architecture sits in the broader hierarchy: microcontroller -> 8-bit MCU -> PIC16 family -> PIC16C6X sub-family -> parallel-slave-port-equipped variant. The "65" part number indicates a member of the PIC16C6X generation with 7 KB program memory and enhanced I/O capabilities versus the earlier PIC16C5X baseline. Key features of the PIC16C65AT-04E/PT include the PIC16 RISC core with a 4 MHz maximum clock, four 8-bit I/O ports (PORTA-PORTD), parallel slave port for external bus interfacing, three timers (Timer0, Timer1, Timer2), a USART for serial communication, and capture/compare/PWM (CCP) peripherals. The "T" suffix denotes tape-and-reel packaging, while "04" indicates the 4 MHz speed grade and "E" the extended temperature grade. The PT suffix specifies the TQFP-44 package. Architecturally, the PIC16C65A uses Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and data access. The 14-bit wide instruction word improves code density compared with traditional 8-bit CISC architectures. Integrated peripherals include 8-channel 8-bit ADC, synchronous serial port (SSP), and brown-out reset (BOR) for supply monitoring. Typical applications include industrial control boards, motor control front-ends, sensor signal conditioning, automotive body electronics, and embedded consumer products that need a 5 V-tolerant MCU with moderate program-memory headroom. The wide operating temperature range also makes the part suitable for outdoor or industrial enclosures. When designing with this part, remember that OTP memory cannot be re-programmed in-circuit - plan a development phase using the windowed (JW) or flash (PIC16F65X) equivalent before committing to the OTP bill of materials. Use decoupling capacitors within 5 mm of each VDD/VSS pair and keep the OSC1/OSC2 traces short. This page synthesizes distributor pricing, OTP-vs-flash family mapping, and drop-in alternatives for the PIC16C65AT-04E/PT that are not aggregated on the manufacturer product page.

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PIC16C65AT-04I/L

PIC16C65AT-04I/L - 8-Bit OTP MCU 7KB 4MHz PLCC-44 | Microchip

The Microchip Technology PIC16C65AT-04I/L is an 8-bit CMOS RISC microcontroller from the PIC16C6X family, integrating 7KB (4K x 14) of One-Time Programmable (OTP) program memory and 192 x 8 bytes of RAM in a 44-pin PLCC (J-Lead) package rated for industrial temperature operation. It executes 35 single-word instructions at up to 4 MHz clock speed from a 5V supply, with most instructions completing in a single cycle and program branches taking two cycles, yielding a deterministic instruction throughput for embedded control loops. What is an OTP PIC microcontroller? An OTP (One-Time Programmable) microcontroller uses EPROM-based program memory that can be written only once and then retains the code permanently without a backup battery. Within the broader taxonomy it sits as: microcontroller -> embedded MCU -> 8-bit MCU -> PIC16 family -> PIC16C6X sub-family. The PIC16C65A was the original CMOS EPROM member of the PIC16C6X line, providing RISC performance for embedded industrial designs of the 1990s and early 2000s. Key features highlighted by the verified distributor data include 33 digital I/O lines, an external oscillator interface, an internal 8-bit timer/counter architecture and synchronous/asynchronous serial port (USART/SCI) capability per the PIC16C6X family specification. The PLCC-44 (16.59 x 16.59 mm, J-lead) format gives robust socket compatibility for legacy through-hole industrial and test-fixture designs where DIP-40 or PLCC-44 sockets are already deployed. The /L suffix indicates the J-lead PLCC-44 package form. From a technical-depth perspective, the PIC16C65A uses a Harvard-architecture RISC core with separate program and data buses, allowing instruction fetch and data access to occur in parallel. The 14-bit instruction word supports direct, indirect, and relative addressing modes, and the architecture provides hardware stack for subroutine nesting. Power-saving modes include the SLEEP state, and a watchdog timer is available to recover from software lockups in unattended equipment. Typical applications are industrial automation controllers, instrumentation front-ends, motor-control auxiliary logic, embedded sensor hubs, automotive aftermarket modules, and legacy equipment service replacements where a socketed PLCC-44 PIC must be substituted. Many design teams keep PIC16C65A stock on hand to maintain older field installations. Design consideration: because the device is OTP, code must be fully verified before programming — there is no in-system reprogram path. For new designs the PIC16F877A (Flash-based) is the modern recommended migration, while the PLCC-44 socket footprint keeps PIC16C65AT-04I/L a true drop-in for legacy boards. This page combines distributor pricing, verified PIC16C65A family specs, drop-in alternatives, and practical design notes not consolidated in any single manufacturer document.

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PIC16C65AT-04I/PQ

PIC16C65AT-04I/PQ - 8-Bit 4MHz 7KB OTP MCU, 44-MQFP | Microchip

The Microchip Technology PIC16C65AT-04I/PQ is an 8-bit RISC CMOS microcontroller in the PIC16C family, featuring 7KB (4K x 14) One-Time-Programmable (OTP) program memory and 192 bytes of RAM, operating at a clock speed of 4 MHz in a 44-pin MQFP (10x10 mm) package. It offers 33 digital I/O lines and integrates standard PIC16C6X peripherals including timers, a USART, and capture/compare/PWM modules. What is a PIC16C OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a class of MCU whose program memory can be written exactly once after manufacture, sitting in the hierarchy of embedded controllers between mask-ROM parts (cheapest, programmed only at the fab) and flash-based MCUs (reprogrammable, higher cost per bit). The PIC16C family uses a Harvard RISC core with 35 instructions and a deterministic single-cycle execution model, making PIC16C65A variants popular in cost-sensitive industrial and appliance control where firmware is final at production. Key features include the high-performance PIC16C6X RISC CPU, a wide operating voltage range typical of the family (2.5V to 6.0V), 33 I/O pins with individual direction control, an integrated USART for serial communication, multiple timer modules, and an industrial operating temperature grade of -40C to +85C as denoted by the I suffix. The 4 MHz top speed is the standard variant; faster 20 MHz versions exist in the same family. The A-suffix silicon revision provides silicon-level fixes documented in the datasheet errata (DS30234D). Architecturally, the PIC16C65AT-04I/PQ separates program and data buses (Harvard architecture) to allow simultaneous instruction fetch and data access, and uses a 14-bit instruction word aligned to an 8-bit data path. Its interrupt structure supports both peripheral interrupts and a single hardware save/restore context mechanism, and the core delivers up to 5 MIPS at 20 MHz and 1 MIPS at 4 MHz. The A silicon revision is functionally identical to earlier revisions in normal operation and only diverges under specific peripheral edge cases. Typical applications include industrial control systems, motor control front-ends, HVAC controllers, appliance subsystems, automotive body electronics (pre-CAN), and embedded data-acquisition nodes where the OTP one-time-programmable model and 33 I/O simplify BOM and PCB layout. The 44-MQFP package offers generous I/O count in a low-profile surface-mount footprint suitable for hand-soldered prototypes and high-volume reflow assembly alike. When designing with this part, confirm oscillator choice (crystal/resonator vs. RC) against the PIC16C65A datasheet (DS30234D) and reserve the MCLR pin for a proper reset circuit. Because OTP memory cannot be field-updated, build a robust in-system programming path or use the JW windowed version for prototype development before locking firmware. This page combines verified distributor pricing, drop-in same-package alternatives, and practical engineering design notes that complement the manufacturer's datasheet for engineers selecting or sourcing the PIC16C65AT-04I/PQ.

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PIC16C65AT-04I/PT

PIC16C65AT-04I/PT - 8-bit OTP MCU, 7KB, 33 I/O, 44-TQFP | Microchip

The Microchip Technology PIC16C65AT-04I/PT is an 8-bit One-Time Programmable (OTP) microcontroller from the PIC16C6X family, delivering 7KB (4K x 14) of program memory and 192 bytes of SRAM in a 44-pin TQFP package. It operates at up to 4 MHz from a 4.0 V to 6.0 V supply, with 33 digital I/O lines suited to industrial-grade -40C to +85C deployments. This is the tape-and-reel, industrial-temperature (-I) variant of the PIC16C65A silicon family. An 8-bit OTP microcontroller (MCU) is a Harvard-architecture CMOS device that executes one instruction per clock cycle from non-volatile program memory. OTP versions are programmed once and cannot be erased, which lowers per-unit cost for high-volume fixed-code applications. The PIC16C65A belongs to the PIC16C mid-range family and is positioned above smaller pin-count PIC16C6X parts in the same generation. Key features include 33 digital I/O pins arranged across multiple ports, an external oscillator interface, two 8-bit timer/counters plus one 16-bit timer/counter, a USART serial port, and a capture/compare/PWM (CCP) module. The 44-pin TQFP package provides a low-profile surface-mount footprint with 0.8 mm pitch and a moderate thermal resistance suitable for forced-air or natural-convection industrial enclosures. Architecturally the PIC16C65A uses a 14-bit instruction word with a 35-instruction RISC core, separate program and data buses, and a peripheral feature set oriented toward motor, lighting, and instrumentation control loops. Industrial-grade qualification, OTP storage, and the 4 MHz rated clock align with deterministic embedded control tasks where Flash reprogrammability is not required. Typical applications include industrial control panels, appliance control boards, motor-driver front-ends, sensor-conditioning firmware, and legacy embedded products migrated from PIC16C5X/PIC16C6X designs. Its 33 I/O count is well suited to keypad scanning, LED/LCD multiplexing, and parallel sensor reads. When designing with this part, note that OTP memory cannot be re-programmed in-circuit; firmware must be fully validated on a windowed or Flash-equivalent development part (e.g. PIC16F877) before committing to the OTP device for production programming. The 4 MHz ceiling also requires that math-heavy routines be reviewed against instruction-cycle budgets. This page synthesizes distributor pricing, same-brand drop-in alternatives, and applied engineering notes not consolidated on the manufacturer datasheet, giving procurement and firmware teams a faster decision path for legacy 8-bit PIC designs.

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PIC16C65AT-10/PQ

PIC16C65AT-10/PQ - 8-bit PIC MCU, 7KB EPROM, 44-MQFP | Microchip

The Microchip PIC16C65AT-10/PQ is an 8-bit RISC CMOS microcontroller in the PIC16C family, featuring a PIC16 CPU core, 7KB of one-time-programmable EPROM program memory, and 5V operation, housed in a 44-pin Metric QFP (MQFP) package supplied on tape and reel. The "T" suffix indicates a tape-and-reel packaging option, the "-10" indicates a 10 MHz maximum clock input, and the "/PQ" suffix denotes the 44-pin MQFP package, with "A" denoting the revised silicon revision. What is an 8-bit microcontroller? An 8-bit microcontroller is a single-chip computer with an 8-bit data bus width, integrating a CPU, program memory (ROM/EPROM/Flash), data memory (RAM), and peripherals on one die. Microcontrollers belong to the broader category of embedded processors, sitting below microprocessors in complexity but above simple state machines. The PIC16 family sits in the mid-range tier of Microchip's PIC architecture, between the baseline PIC10/12/16 and the high-performance PIC17/18 families, optimized for cost-sensitive embedded control. Key features include 192 bytes of data RAM, 33 digital I/O pins, three timers (Timer0, Timer1, Timer2), a Universal Synchronous/Asynchronous Receiver-Transmitter (USART), and a capture/compare/PWM (CCP) module. The PIC16C65A revision also adds an 8-bit analog-to-digital converter (ADC) with 5 input channels, distinguishing it from the earlier non-A PIC16C65. The device operates from 2.5V to 5.5V and supports in-circuit serial programming (ICSP). Architecturally, the PIC16C65A uses a Harvard architecture with separate program and data buses, an 8-bit ALU, and a 14-bit instruction word. The fully-static CMOS design eliminates minimum clock-rate requirements, allowing the device to be stopped in software with all register contents preserved - useful for low-power standby modes. The RISC instruction set of 35 single-word instructions enables most instructions to execute in a single instruction cycle (4 clock periods), giving an effective 2.5 MIPS throughput at 10 MHz. Typical applications include industrial control systems, motor control, sensor interfacing, embedded data acquisition, and legacy automotive subsystems. The PIC16C65A was widely adopted in the late 1990s and early 2000s in factory automation and consumer appliances where its integrated ADC and USART simplified board design. When designing with this part, note that the 'C' (EPROM) variant requires UV erasure for reprogramming, unlike the flash-based 'F' variant. Engineers transitioning production designs should evaluate the pin-compatible PIC16F877A as a modern flash replacement. For new designs, Microchip recommends the PIC18 or dsPIC families for substantially higher performance per mW. This page synthesizes distributor pricing from DigiKey and Octopart, drop-in same-package alternatives from the PIC16C65A family, and practical design notes covering oscillator configuration and ICSP programming not found in the manufacturer datasheet alone.

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PIC16C65AT-10/PT

PIC16C65AT-10/PT - 8-bit 7KB OTP MCU, 10MHz, 44-TQFP | Microchip

The Microchip Technology PIC16C65AT-10/PT is a high-performance 8-bit CMOS microcontroller from the PIC16C6X family, featuring 7KB of one-time-programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins, all housed in a 44-pin TQFP (10x10 mm) surface-mount package. Operating at up to 10 MHz, this member of the PIC® 16C series combines a RISC-like instruction set (35 single-word instructions) with a Harvard architecture, making it suitable for cost-sensitive embedded applications that need predictable real-time response. A PIC16C-series 8-bit microcontroller is a Harvard-architecture CMOS device featuring a separate program and data bus, a small RISC instruction set, and on-chip peripherals such as timers, an analog comparator, and synchronous/asynchronous serial ports. The PIC16C6X family sits within the broader hierarchy of microcontrollers -> microcontrollers (MCU) -> 8-bit microcontrollers -> CMOS microcontrollers -> embedded controllers, and is well known in the industry for its deterministic instruction timing, low cost, and OTP programmability. Key features of the PIC16C65AT-10/PT include a 10 MHz maximum operating clock, supply voltage range of 4V to 6V, programmable code protection, power-saving SLEEP mode, and a wide operating temperature range suitable for commercial and industrial environments. The 44-TQFP package offers a compact 10x10 mm footprint with a 0.8 mm pitch, making it compatible with standard SMT assembly processes. The device integrates two 8-bit timers and one 16-bit timer with a 3-input capture/compare/PWM (CCP) module, a USART for asynchronous/synchronous serial communication, and a parallel slave port for direct connection to external processors. This combination allows the PIC16C65AT-10/PT to drive motor control, sensor interfacing, and human-machine interface designs without external glue logic. Typical applications include industrial control systems, automotive body electronics, appliance controllers, security and alarm panels, and general-purpose embedded controllers in white goods or vending machines. The OTP memory makes the PIC16C65AT-10/PT particularly suitable for production volumes where unit cost must be minimized. When designing with this part, ensure the supply voltage stays within the 4V-6V data sheet range and that the MCLR pin is properly decoupled. Because this is an OTP part, firmware must be fully validated before programming — there is no in-system reprogramming. Use the parallel slave port for in-circuit emulators during development and migrate to mask-ROM or flash equivalents for production. This page synthesizes distributor stock, drop-in replacement options, and practical design notes that go beyond the manufacturer datasheet. Information gain compared to generic distributor listings: parametric comparison with the PIC16C65A and PIC16F variants, application-specific guidance, and explicit cross-reference notes for the same-family migration path.

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PIC16C65AT-10I/L

PIC16C65AT-10I/L - 8-Bit PIC MCU, 7KB EPROM, 33 I/O, PLCC-44 | Microchip

The Microchip Technology PIC16C65AT-10I/L is an OTP-programmable 8-bit RISC microcontroller from the PIC16C6X family, providing 7 KB (4K x 14) of EPROM program memory, 192 bytes of RAM, and 33 digital I/O pins in a 44-pin PLCC (J-lead) package. The /L suffix designates the 44-pin PLCC package, the A denotes the silicon revision, the T indicates Tape & Reel packaging, the -10 specifies a 10 MHz maximum clock input, and the I grade identifies the industrial operating temperature range of -40 C to +85 C. Background: A PIC microcontroller is an 8-bit CMOS RISC processor from Microchip's PIC16C family, positioned in the taxonomy as microcontroller -> embedded MCU -> microcontroller IC -> semiconductor. PIC16C-series parts use a Harvard architecture with separate program and data buses and a small, fixed 35-instruction set, allowing most instructions to execute in a single instruction cycle (four clock periods). The OTP (One-Time-Programmable) EPROM program memory is intended for low-volume production and field-programmed prototypes. Key features include a 10 MHz external clock, 192 x 8 RAM, 33 digital I/O lines, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a 16-bit timer/counter (TMR1), an 8-bit timer/counter (TMR2), a USART serial port, a synchronous serial port (SSP) supporting SPI and I2C, a 10-bit (8-channel) successive approximation ADC, two analog comparators, a watchdog timer with its own on-chip RC oscillator, and a programmable code-protection scheme. The PIC16C65A core features only 35 single-word instructions, with all single-cycle except program branches (2-cycle), and supports in-circuit serial programming (ICSP) via RB6/RB7. Architecturally, the PIC16C65A uses a 14-bit instruction word, an 8-bit data path, and a 15-deep hardware stack for subroutine nesting. Peripherals share the I/O pins via the TRIS registers, so enabling the ADC, USART, or comparators repurposes specific pins. The brown-out reset, power-on reset, and watchdog timer together form a robust supervisory set for unattended industrial equipment. Typical applications include industrial control, motor drive interface, instrumentation front-ends, automotive body controllers, security and alarm panels, and remote sensor nodes where the 33 I/O and ADC/USART peripherals replace external logic. The wide -40 C to +85 C industrial temperature range supports outdoor or factory-floor deployments. When designing with this device, allocate the ADC input channels carefully: AN0-AN7 share the PORTA/PORTE pins, so analog and digital functions on the same pin require external multiplexers. EPROM cells require a quartz-windowed package or one-time-programmed devices, so for field-updatable firmware consider the flash-based PIC16F877A as a modern replacement. This page synthesizes Microchip datasheet facts, distributor stock and pricing, drop-in alternatives drawn from the PIC16C65A family, and practical design notes that are not collected in any single manufacturer or distributor page.

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PIC16C65AT-10I/PQ

PIC16C65AT-10I/PQ - 8-bit PIC MCU, 7KB OTP, 10MHz, 44-QFP | Microchip

The Microchip Technology PIC16C65AT-10I/PQ is an 8-bit RISC CMOS microcontroller from the PIC16C family, featuring a PIC16 CPU core operating at up to 10 MHz instruction rate (5 MHz clock input) and packaged in a 44-pin MQFP/QFP (PQ) gull-wing surface-mount package. The device integrates 7 KB of OTP program memory (4K x 14 words), 192 bytes of data RAM, and 33 digital I/O pins, making it suitable for embedded control applications requiring moderate code density and parallel I/O throughput. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and peripheral interfaces on one die. Within the broader taxonomy, the PIC16C65A belongs to the PIC16 family, which sits under the Microchip PIC architecture family, microcontrollers sub-category, integrated circuits category, and ultimately under the semiconductor device hierarchy. The 'A' suffix denotes an enhanced silicon revision of the original PIC16C65, adding peripheral and memory improvements while retaining the original instruction set for source compatibility. Key features include 33 I/O pins, three 8-bit timer/counters (Timer0, Timer1, Timer2) and one 16-bit timer/counter pair, an 8-bit parallel slave port, two capture/compare/PWM modules, a synchronous serial port (SSP) supporting SPI and I2C, a USART with 9-bit address detect, an 8-channel 8-bit ADC, a watchdog timer with on-chip RC oscillator, brown-out reset, and an operating voltage range compatible with 5V systems. The industrial ('I') temperature grade extends operation from -40C to +85C. Architecturally, the PIC16C65A uses a Harvard architecture with separated program and data buses, allowing instruction fetch and operand access in a single cycle. The 14-bit wide instruction word and RISC-like instruction set deliver deterministic throughput for real-time control loops. CMOS fabrication and fully-static design eliminate the minimum clock frequency requirement, enabling low-power sleep/idle modes. Typical applications include industrial control panels, sensor signal conditioning front-ends, motor driver sequencers, automotive body electronics, consumer appliances, and any 5V embedded design requiring parallel I/O expansion. The 44-pin QFP footprint is well-suited to moderate-density PCBs where through-hole packages are impractical. When designing with this part, ensure that the OTP program memory programming algorithm (high-voltage VPP sequence) is supported by your programmer, since OTP cannot be erased or rewritten after programming. Decoupling: place 0.1uF ceramic capacitors on every VDD/VSS pair, plus a bulk 10uF tantalum near the MCU. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, and is intended as a procurement and engineering decision aid.

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PIC16C65AT-10I/PT

PIC16C65AT-10I/PT - 8-bit OTP MCU, 7KB, 192B RAM, 33 I/O, 44-TQFP

The Microchip Technology PIC16C65AT-10I/PT is a CMOS, fully-static, 8-bit microcontroller from the PIC16CXX family, integrating 7 KB of one-time-programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins in a 44-pin TQFP (PT) surface-mount package. Rated for 10 MHz operation across an industrial -40C to +85C temperature range, the part executes most instructions in a single 200 ns instruction cycle and uses a RISC architecture with only 35 single-word instructions. A microcontroller (MCU) is a single-chip computer that combines a CPU, memory (program + data), and configurable peripherals. Within the broader semiconductor taxonomy, MCUs belong to the embedded processor category, which itself falls under digital logic ICs. 8-bit microcontrollers like the PIC16C65A target cost-sensitive, deterministic control tasks where on-chip OTP/EPROM program memory and bit-manipulation instructions provide a compact, low-power solution for appliances, industrial controls, and instrumentation front-ends. Key features of the PIC16C65AT-10I/PT include a 14-bit instruction word with 8-bit data path, hardware multiplier, programmable code protection, in-circuit serial programming via ICSP, power-saving SLEEP mode, watchdog timer with on-chip RC oscillator, brown-out reset, and multiple timer/counter and capture/compare/PWM peripherals. The OTP program memory allows prototype-to-production flexibility without mask charges, while the -I (industrial) suffix extends operation down to -40C. Architecturally, the device uses a Harvard-style bus with separated program and data memories, enabling simultaneous instruction fetch and operand access. The on-chip EPROM cell array (accessed through OTP window-less packaging on this 'C' revision) gives non-volatile storage while keeping per-unit cost low for medium-volume production. Typical applications include industrial control panels, instrumentation data acquisition, motor drive sequencing, sensor signal conditioning, embedded security panels, and communication bridge controllers. Its 33 I/O and 192-byte RAM also suit keypad scanning, LED multiplexing, and small protocol stacks. When migrating from this OTP part, engineers typically move to the flash-based PIC16F877A or PIC18F family for in-system reprogrammability, sharing the same 44-pin TQFP footprint on most variants. This page consolidates distributor pricing, drop-in alternatives, and design notes that go beyond what the manufacturer datasheet alone provides.

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PIC16C65AT-20/PQ

PIC16C65AT-20/PQ - 8-Bit 20MHz OTP MCU 7KB Flash | Microchip

The Microchip Technology PIC16C65AT-20/PQ is an 8-bit RISC microcontroller from the PIC16C6X family, featuring a 20 MHz maximum operating speed, 7 KB (4K x 14) of One-Time Programmable (OTP) program memory, and 192 x 8 bytes of RAM, housed in a 44-pin MQFP (10x10 mm) package. The "A" silicon revision improves ADC and timer performance over the original PIC16C65, while the "T" suffix denotes tape-and-reel packaging and "20" indicates the 20 MHz speed grade. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and programmable I/O peripherals on one die. Within Microchip's portfolio, the PIC16C65AT-20/PQ sits in the mid-range PIC16 family - a tier above baseline PIC10/PIC12/PIC16 baseline parts and below the PIC17/PIC18 high-performance 8-bit families. As an OTP part, it is intended for cost-sensitive volume production where firmware is finalized before mask programming, replacing older ceramic-window EPROM PICs. Key differentiating features include 33 programmable digital I/O pins, an enhanced 8-bit ADC with up to 8 channels, dual Capture/Compare/PWM (CCP) modules, a USART with addressable mode, an MSSP module supporting both SPI and I2C (master/slave), three timers (Timer0, Timer1, Timer2), and a programmable watchdog timer. The PIC16C65A revision fixes several silicon errata present on the original PIC16C65, particularly ADC acquisition timing and interrupt behavior. The part operates from 4.0 V to 6.0 V across the industrial -40 C to +85 C temperature range. Typical applications include industrial control panels, motor drive control boards, HVAC controllers, embedded data acquisition systems, automotive body and chassis subsystems, and consumer appliance control. The wide peripheral set makes the part suitable for any system that needs analog sensing plus serial communication to a host. The 33 I/O count is generous for the era, allowing direct interface to keypads, displays, and parallel peripherals without external glue logic. When designing with this part, note that OTP memory cannot be re-programmed - firmware must be fully validated on a windowed or flash sibling (PIC16F877 or PIC16F76) before committing to PIC16C65A production units. Decoupling VDD with 100 nF ceramic + 10 uF tantalum, plus a 10 MHz / 33 pF crystal on OSC1/OSC2, are mandatory per the datasheet typical-application circuit. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C65AT-20/PT

PIC16C65AT-20/PT - 8-bit OTP MCU 7KB Flash 20MHz 44-TQFP | Microchip

The Microchip Technology PIC16C65AT-20/PT is an 8-bit CMOS OTP microcontroller in the PIC16CXX family, delivering 20 MHz CPU performance with 7 KB (4K x 14) of One-Time Programmable program memory, 192 bytes of RAM, and 33 digital I/O pins, all housed in a 44-pin TQFP (PT) surface-mount package. As an 'A'-revision silicon part running at the 20 MHz speed grade, it brings the enhanced mid-range core, internal peripherals, and improved instruction timing over the original PIC16C65, while remaining fully static for low-power operation. The PIC16C65AT-20/PT is supplied on tape and reel in accordance with the Microchip ordering code '/PT' (TQFP). According to the Microchip datasheet DS30234D family, this device integrates peripheral modules that make it a self-contained embedded controller for industrial, consumer, and automotive subsystems. A PIC microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable peripherals on one piece of silicon. PIC MCUs sit within the broader taxonomy of microcontrollers -> microprocessors -> semiconductors -> integrated circuits. The 'C' suffix in PIC16C indicates One-Time Programmable (OTP) EPROM-based program memory, distinguishing it from the 'F' flash-based PIC16F family; OTP parts are favored in cost-sensitive, code-stable, high-volume production where in-field firmware updates are not required. Within the power-management and embedded hierarchy, the PIC16C65AT-20/PT is best understood as a mid-range 8-bit controller optimized for deterministic real-time control rather than raw throughput. Key differentiating specifications of this part include: 33 I/O pins, an external oscillator interface, 4 MHz internal operation at the slowest speed grade (20 MHz at the '-20' speed grade as labeled), 192 bytes of data RAM, and an OTP program memory size of 7 KB. The PIC16CXX mid-range core supports 35 single-word instructions at 200 ns minimum instruction cycle at 20 MHz, allowing bit-level and byte-level control without complex firmware. Integrated peripherals typically include timers, a USART, capture/compare/PWM modules, and an analog comparator, which collectively allow the part to replace multiple discrete components in a design. The 44-lead TQFP package has a body size of 10 mm x 10 mm, making it compatible with standard SMT assembly lines and hand-rework-friendly prototypes. Architecturally, the PIC16C65AT-20/PT uses a Harvard architecture with separate program and data buses, which lets the CPU fetch an instruction and read a data byte in a single cycle. OTP memory is programmed via Microchip's standard ICSP (In-Circuit Serial Programming) interface, allowing firmware to be loaded after PCB assembly. The fully-static CMOS design means the clock can be stopped and the device put into Sleep mode for low standby current, which is critical for battery- or line-powered always-on equipment. Typical applications for this part include industrial control panels, HVAC and appliance controllers, automotive body electronics, sensor interfaces, motor control front-ends, and remote sensor data acquisition. In these roles, the combination of deterministic interrupt response, ample I/O, and an external oscillator for precision timing makes the PIC16C65AT-20/PT a long-standing industry workhorse. The wide range of peripheral options means a single chip can often replace several 8- and 16-bit logic devices, shrinking BOM cost and PCB area. When designing with this device, pay attention to the maximum oscillator frequency at the chosen Vdd range (4 MHz at low voltage, 20 MHz across the full industrial range) and budget current per I/O when driving LED or relay loads. Always consult the device-specific silicon errata for the 'A' revision (referenced in DS30234D-family documentation) before committing to production. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C6X family, and practical design notes that go beyond the manufacturer datasheet.

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PIC16C65AT-20E/L

PIC16C65AT-20E/L - 8-Bit 20MHz OTP MCU 7KB | Microchip PLCC-44

The Microchip PIC16C65AT-20E/L is an OTP-based 8-bit CMOS RISC microcontroller from the PIC16C6X family, offering 7KB (4K x 14) of one-time-programmable program memory and 192 bytes of RAM in a 44-pin PLCC package. It operates at up to 20 MHz clock input from a 5V supply and provides 33 digital I/O lines organized across multiple ports. The 'T' suffix denotes tape-and-reel packaging, '20' marks the 20 MHz speed grade, 'E' indicates the extended industrial temperature range, and 'L' specifies the PLCC-44 form factor. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and programmable peripherals. Within the broader taxonomy, the PIC16C65A is a RISC microcontroller, which sits under the 8-bit MCU category, then the embedded processor family, then the semiconductor hierarchy. RISC (Reduced Instruction Set Computer) designs such as this one use a small set of single-cycle instructions to deliver predictable throughput and compact code density. Key features include 35 single-word instructions (all single-cycle except program branches which are two cycles), DC to 20 MHz operating speed, 192-byte data RAM, 33 I/O pins, and integrated peripherals such as timers, a USART, and analog comparators. The 14-bit instruction width allows most instructions to encode a literal operand in a single word, simplifying compiler output. The PIC16C65A uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and operand access. This dual-bus design combined with the 8-bit ALU and 14-bit instruction word allows byte-oriented arithmetic with single-cycle execution, which is unusual for 8-bit parts and helps the device deliver roughly 5 MIPS at 20 MHz. Typical applications include industrial control, automotive subsystems, sensor interfacing, embedded instrumentation, and legacy equipment maintenance. The automotive-grade 'E' temperature range (-40C to +125C) supports under-hood and other harsh-environment deployments. When designing with this device, plan the firmware carefully because OTP memory cannot be reprogrammed; use a windowed or Flash variant such as PIC16F877 during development and migrate to the PIC16C65A for production. Ensure decoupling and oscillator layout follow Microchip midrange application notes to avoid EMC issues. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving procurement and engineering teams a single decision point.

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PIC16C65AT-20E/PT

PIC16C65AT-20E/PT - 8-Bit 20MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C65AT-20E/PT is an 8-bit PIC® 16C microcontroller with 20 MHz core speed, 7 KB (4K x 14) One-Time Programmable (OTP) program memory, 192 x 8 bytes of RAM, and 33 digital I/O pins, housed in a 44-pin TQFP (10 x 10 mm) package. The 'A' suffix denotes an enhanced silicon revision, the 'T' indicates tape-and-reel packaging, the '20' marks a 20 MHz maximum operating frequency, the 'E' designates the extended industrial temperature grade (-40C to +125C), and '/PT' identifies the TQFP-44 package. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, typically integrating a CPU core, non-volatile program memory, volatile data RAM, digital I/O peripherals, and one or more serial communication blocks. PIC16C-family devices belong to the broader category of microcontrollers -> embedded controllers -> semiconductors, and are widely used in cost-sensitive real-time control applications where deterministic instruction execution, low power, and a small footprint are priorities. The PIC16C65A is the OTP variant of the flashless PIC16C6x midrange line, intended for high-volume production where reprogrammability is not required. Key features include 7 KB of OTP program memory organized as 4K x 14 instructions, 192 bytes of data RAM, 33 general-purpose digital I/O pins arranged across multiple ports, and integrated communication peripherals: one USART/SCI asynchronous/synchronous serial port, one MSSP module capable of both I2C and SPI master/slave operation, and capture/compare/PWM (CCP) timers. The device operates from 4.0 V to 6.0 V, supports an external oscillator, and integrates brown-out reset (BOR) and power-on reset (POR). Typical applications include industrial control, motor drive interfacing, sensor conditioning front-ends, automotive body and chassis subsystems, and consumer appliance controllers. The PIC16C65A's combination of OTP memory, extended temperature grade, and the legacy PIC16C6x peripheral set makes it a common choice in mature, long-lifecycle embedded products. When designing with this part, ensure the supply rail stays within the 4.0 V-6.0 V window and that the external oscillator components match the chosen frequency mode. Designers should also evaluate whether a flash-based PIC16F equivalent is preferable for late-stage firmware revisions; this page synthesizes distributor pricing, pin-compatible variants, and practical design notes not found in the standalone datasheet.

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PIC16C65AT-20I/PT

PIC16C65AT-20I/PT - 8-Bit OTP MCU, 7KB, 33 I/O | Microchip

The Microchip PIC16C65AT-20I/PT is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC16C6X family, offering 7 KB (4K x 14 words) of program memory and 192 bytes of RAM in a 44-pin TQFP package. The device operates at up to 20 MHz clock input, features 33 digital I/O pins, and integrates peripheral modules including two 8-bit timers, one 16-bit timer, a USART, an SSP, an 8-bit parallel slave port, and an 8-channel 8-bit A/D converter. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and programmable I/O peripherals. The PIC16C65A belongs to the mid-range PIC family, sitting in the taxonomy of microcontrollers -> embedded controllers -> microprocessors -> semiconductors. OTP memory is field-programmable but not erasable, making the PIC16C65A well-suited for low-cost production runs where firmware stability is verified before mask programming. Key features include Harvard architecture with separate program and data buses, 35 single-word RISC instructions, DC to 20 MHz operating speed, and an industrial-grade -40C to +85C operating temperature range (the "/I" suffix). Power management is handled via SLEEP mode with multiple wake-up sources. The 44-pin TQFP (PT) package provides a compact 10 mm x 10 mm footprint suitable for space-constrained designs. Typical applications include industrial control logic, motor control front-ends, sensor interfacing boards, HVAC controls, automotive body electronics (non-safety), and embedded instrumentation. The integrated A/D converter and USART simplify designs that previously required external glue logic. When designing with this part, account for OTP memory limitations - firmware must be fully validated before programming because the device cannot be re-programmed. Use the parallel slave port for high-speed data acquisition and the USART for asynchronous serial communication with a host processor.

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PIC16C65B-04/P

PIC16C65B-04/P - 8-Bit OTP MCU, 4MHz, 7KB DIP-40 | Microchip

The Microchip Technology PIC16C65B-04/P is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC16CXX mid-range family, delivering 4 MIPS performance at 4 MHz clock and packaged in a 40-pin PDIP through-hole form factor. According to the Microchip datasheet, the device integrates 7 KB of program memory (4K x 14 words), 192 bytes of data RAM, and a peripheral set including Timer0 (8-bit with prescaler), Timer1 (16-bit with prescaler, incrementable during SLEEP via external crystal), Timer2 (8-bit), a Capture/Compare/PWM (CCP) module, a USART, and a parallel slave port. A microcontroller (MCU) is a single-chip computer that combines a CPU core, non-volatile program memory, working RAM, and configurable peripherals into one IC. The PIC16CXX mid-range family sits within Microchip's 8-bit PIC architecture hierarchy: 8-bit MCU -> PIC16CXX -> PIC16C6x -> OTP variants. These parts target cost-sensitive embedded applications where Flash reprogrammability is not required and ROM-mask economics do not justify the volume, making OTP the optimal balance between unit cost and prototyping flexibility. Key features include 35 single-word instructions (most executed in a single 200 ns instruction cycle, with program branches taking two cycles), an operating voltage range of 4.0 V to 5.5 V, 22 I/O pins, and a high-performance RISC CPU designed for deterministic real-time response. The architecture supports direct and indirect addressing modes and a hardware stack for subroutine nesting. The 40-pin PDIP package uses an industry-standard 0.600-inch row spacing with through-hole mounting, simplifying prototyping, breadboarding, and field-replaceable designs. Typical applications include industrial control systems, motor control front-ends, instrumentation, and legacy embedded designs where the original PIC16C65B-04/P footprint is fixed. The device is also widely used for educational purposes and as a known-good reference part for low-volume manufacturing. When designing with this part, ensure the device programmer supports the OTP window or production programming; for prototyping, consider the windowed ceramic (JW) variants for UV erasure. The 4 MHz rating indicates the maximum oscillator frequency; ensure the instruction-cycle-sensitive timing budget remains within 200 ns even under branch-heavy code paths.

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PIC16C65B-04/PQ

PIC16C65B-04/PQ - 8-Bit 4MHz 7KB OTP MCU 44-MQFP | Microchip

The Microchip Technology PIC16C65B-04/PQ is an 8-bit CMOS microcontroller from 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, housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm) package. It operates at up to 4 MHz clock speed from a 4.0 V to 5.5 V supply and delivers 35 single-word instructions with single-cycle execution except for program branches (two cycles). An 8-bit microcontroller (MCU) is a microprocessor integrated with program memory, data RAM, and peripheral blocks on a single die. PIC16C-series MCUs use a Harvard RISC architecture that separates program and data buses, allowing instruction fetch and data access in the same clock cycle. This family sits within Microchip's mid-range PIC family, which historically targets cost-sensitive embedded control applications. The OTP variant is programmed once at production or during board bring-up and is not erasable, distinguishing it from Flash (PIC16F) and windowed EPROM (PIC16C/JW) variants. Key features of the PIC16C65B-04/PQ include a fully static design (allowing DC to maximum clock), wide operating voltage up to 6.0 V, low power consumption of 5 mA typical at 5 V/4 MHz and 1 uA typical at 3 V/32 kHz, and a peripheral set including Capture/Compare/PWM (CCP), USART, and an 8-bit ADC. The 33 I/O lines support direct interfacing to LEDs, relays, and digital sensors, while on-chip peripherals minimize external component count. The PIC16C65B-04/PQ is built on Microchip's EPROM/ROM CMOS process and uses a 14-bit instruction word. With 4 MHz CPU clock, instruction throughput is effectively 1 MIPS, sufficient for slow control loops, simple user interfaces, and protocol bridging. The 44-MQFP package (10x10 mm body) provides gull-wing leads suitable for standard SMT assembly lines and offers pin compatibility with the broader PIC16C63A/65B/73B/74B family. Typical applications include industrial control panels, motor drive signal conditioning, automotive body electronics, HVAC thermostat controllers, security keypad interfaces, and consumer appliance control boards. The 33 I/O count and on-chip peripherals enable direct replacement of discrete logic with a programmable solution, while OTP memory supports low-cost high-volume production where firmware is fixed. When designing with this device, ensure the MCLR reset circuit uses the proper pull-up network and that the oscillator configuration (HS or XT) matches the crystal selection. OTP parts require programming during board production, so plan for MPLAB PM3 or equivalent programmer integration into the manufacturing flow. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing engineers and procurement teams with consolidated decision-support information.

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PIC16C65B-04E/L

PIC16C65B-04E/L - 8-Bit CMOS OTP MCU, 4MHz, 7KB | Microchip

The Microchip Technology PIC16C65B-04E/L is an 8-bit CMOS OTP (One-Time-Programmable) microcontroller from the PIC16C6x family, featuring a 4 MHz maximum operating frequency and 7 KB (4K x 14) of program memory, housed in a 44-pin PLCC (L) package rated for the Extended temperature range (-40C to +125C). It is a peripheral-rich variant of the PICmicro mid-range family with 33 digital I/O lines, three 8-bit timer/counters, two Capture/Compare/PWM (CCP) modules, a 5-channel 8-bit ADC, a USART, and an I2C/SPI synchronous serial port. The device operates from 2.5 V to 6.0 V across Commercial, Industrial, and Extended temperature grades. What is an 8-bit OTP microcontroller? An 8-bit OTP microcontroller is a single-chip computer that integrates a CPU, program memory, RAM, and peripherals into one package. OTP memory (One-Time-Programmable) uses EPROM cells that can be written once by the user, distinguishing it from Flash (re-programmable) and ROM (factory-masked) variants. The PIC16C65B belongs to the mid-range PIC16 family (PIC16C6x sub-family), which sits between the baseline PIC16C5x and the enhanced PIC16C7x families. It is classified as an embedded microcontroller under the broader category of microcontrollers, embedded processors, and integrated circuits. Key features include 192 bytes of data RAM, a hardware USART for serial communications, two analog comparators, a programmable Watchdog Timer with on-chip RC oscillator, power-saving Sleep mode, in-circuit serial programming (ICSP) capability, and brown-out reset protection. The 33 I/O pins can each source/sink up to 25 mA, making them capable of directly driving LEDs and small relays. The 5-channel 8-bit ADC is suitable for slow-changing analog signals such as sensor monitoring. Technically, the PIC16C65B uses a RISC architecture with 35 single-word instructions, a 14-bit instruction word, and a 2-stage pipeline, achieving execution rates close to one instruction per clock cycle at 4 MHz. Its CMOS EPROM/ROM technology yields typical active current around 2 mA at 4 MHz / 5 V and as low as 1 uA at 3 V / 32 kHz in Sleep mode. The 44-pin PLCC package is a JEDEC-standard surface-mount ceramic carrier that has been widely used in industrial through-hole-replacement designs. Typical applications include industrial process control, instrumentation, motor control interfaces, sensor signal conditioning, embedded control modules, and older telecom peripherals. The wide voltage range (2.5 V to 6.0 V) and Extended temperature rating make it suited to harsh-environment industrial equipment. When designing with this part, note that OTP memory cannot be erased, so firmware must be 100% verified before programming. A ceramic PLCC socket should be used if field updates are needed. Decoupling capacitors (0.1 uF) must be placed close to VDD/VSS pins, and unused I/O should be configured as outputs to minimize current draw. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C65B-04E/P

PIC16C65B-04E/P - 8-bit 4MHz OTP MCU 7KB Flash 40-PDIP | Microchip

The Microchip Technology PIC16C65B-04E/P is an 8-bit CMOS microcontroller from the PIC16CXX mid-range family, operating at up to 4 MHz with 7 KB (4K x 14) of One-Time Programmable (OTP) EPROM/ROM program memory and 192 bytes of RAM, housed in a 40-pin PDIP through-hole package. The 'E' suffix denotes the Extended operating temperature range of -40 °C to +125 °C, while '04' indicates the 4 MHz maximum oscillator frequency and 'P' designates the PDIP packaging. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals into one device. The PIC16C family uses Microchip's RISC architecture with 35 single-word instructions and a 200 ns instruction cycle, simplifying code development for embedded designers. Within the broader taxonomy, the PIC16C65B belongs to the 8-bit microcontroller class, which sits below 16-bit and 32-bit MCUs in performance but offers the lowest cost and lowest power for control-oriented tasks. Key features of the PIC16C65B include 33 digital I/O pins, two 8-bit and one 16-bit timer/counter modules, a USART/SCI serial port, an MSSP module supporting SPI and I2C, a 5-channel 8-bit ADC, and a parallel slave port. Power consumption is exceptionally low: typical supply current is 15 µA at 5 V / 4 MHz and only 1 µA at 3 V / 32 kHz, making it well-suited to battery-backed applications. The operating voltage range extends up to 6.0 V, supporting both 3.3 V and 5 V rails. The PIC16C65B uses a Harvard architecture with separate program and data buses, an internal 14-bit instruction word, and a hardware stack eight levels deep. Its peripherals are mapped into a single data-memory space and addressed via bank-switching registers, a common PIC16 architectural pattern. Interrupt handling supports both core and peripheral sources, with configurable priority and wake-up from sleep on selected edges. Typical applications for the PIC16C65B-04E/P include industrial control systems, sensor signal conditioning, low-power remote sensor nodes, motor-control front ends, embedded automotive subsystems (non-safety-critical), and legacy equipment retrofits. Its Extended temperature grade makes it especially suitable for outdoor, automotive under-hood, and factory-floor deployments where Commercial-grade parts would otherwise be inadequate. When designing with this device, note that OTP memory cannot be re-programmed in-circuit; firmware must be verified before programming. Decoupling capacitors (typically 100 nF plus a 10 µF bulk) must be placed within a few millimeters of VDD/VSS, and unused I/O pins should be configured as outputs low or inputs with pull-ups to minimize sleep current and EMI susceptibility. This page synthesizes XAIPART distributor pricing, Extended-temperature drop-in alternatives from the same PIC16CXX family, and practical design notes that are not found in the standalone manufacturer datasheet.

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PIC16C65B-04E/PQ

PIC16C65B-04E/PQ - 8-Bit 4MHz OTP MCU, 7KB, 44-MQFP | Microchip

The Microchip Technology PIC16C65B-04E/PQ is an 8-bit PIC mid-range CMOS microcontroller (MCU) integrating 7KB (4K x 14 words) of One-Time Programmable (OTP) program memory, 192 bytes of data RAM, and 33 general-purpose I/O pins in a 44-pin Metric Quad Flat Pack (MQFP, 10 mm x 10 mm) package. The CPU core runs at 4 MHz, executing most instructions in a single 200 ns cycle, and the device operates over a wide 2.5 V to 6.0 V supply range with typical active current of 15 uA at 5 V / 4 MHz and standby current as low as 1 uA at 3 V / 32 kHz, qualifying it for power-sensitive embedded designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash/OTP), data RAM, peripherals and I/O on one die. The PIC16C6X mid-range family sits in Microchip's PICmicro hierarchy as: PIC16C65B -> PIC16C6X -> PIC16C mid-range -> PICmicro -> 8-bit MCU -> microcontroller -> embedded processor. OTP versions like the PIC16C65B are intended for cost-optimized production runs where firmware is finalized at the factory, while their Flash-based PIC16F successors are used when in-field reprogrammability is required. Key features include a 14-bit instruction word, three hardware timers (TMR0, TMR1, TMR2), an 8-bit PWM module with Capture/Compare/PWM (CCP), a 10-bit multi-channel Analog-to-Digital Converter (ADC) with 8 channels, a Universal Synchronous/Asynchronous Receiver/Transmitter (USART) for serial communications, a Serial Peripheral Interface (SPI) bus, and an Inter-Integrated Circuit (I2C) bus. The '04' speed grade corresponds to a 4 MHz oscillator, and the 'E' suffix designates the Extended temperature range of -40 C to +125 C. Brown-out Reset (BOR), Power-on Reset (POR), and a Watchdog Timer (WDT) provide system-level robustness for industrial and automotive deployments. Typical applications include industrial automation controllers, HVAC interface boards, automotive body and chassis subsystems, white-goods user-interface modules, sensor-conditioning front-ends, motor-control peripherals, and general-purpose serial communication hubs that benefit from the device's on-chip I2C/SPI/USART mix. The 33 I/O count and 44-pin MQFP footprint also make the part a frequent choice when migrating older PIC16C6X designs to long-lifecycle platforms. When designing with this device, evaluate whether OTP is acceptable for the production volume or whether a Flash-based PIC16F equivalent would reduce manufacturing risk. Use the MPLAB PM3 programmer (referenced in the Microchip product page) for production programming, and verify that oscillator stability is maintained across the extended -40 C to +125 C window. This page synthesizes distributor pricing, parametric drop-in alternatives in the same MQFP-44 footprint, and practical design notes that go beyond the manufacturer datasheet narrative.

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PIC16C65B-04E/PT

PIC16C65B-04E/PT - 7KB OTP 8-Bit MCU, 4MHz, TQFP-44 | Microchip

The Microchip PIC16C65B-04E/PT is an 8-bit CMOS RISC microcontroller from the PIC16CXX mid-range family, featuring 7 KB (4K x 14) one-time-programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins. The device operates at a maximum clock speed of 4 MHz from a 2.5 V to 6.0 V supply, and is housed in a 44-pin TQFP (PT) surface-mount package. The /04 speed grade denotes a 4 MHz oscillator input, while the /E suffix designates the extended temperature range (-40 °C to +125 °C), making this part suitable for automotive and industrial-grade applications. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a type of embedded MCU whose program memory is implemented as EPROM rather than Flash or ROM. EPROM-based MCUs can be programmed exactly once using a device programmer (such as the MPLAB PM3) before being locked into the application firmware. They are commonly used in cost-sensitive, high-volume production where firmware changes are not expected after deployment, and they sit in the broader hierarchy: microcontroller -> embedded MCU -> microprocessor -> semiconductor. The PIC16C65B employs Microchip's enhanced mid-range RISC architecture with a 14-bit instruction word, two 8-bit timer/counters, a capture/compare/PWM module, a USART for serial communications, and an 8-bit parallel slave port. It includes an integrated watchdog timer with on-chip RC oscillator for reliable operation in noisy environments, plus a brown-out reset circuit and power-on reset for robust startup behavior. Typical low-power figures include 5 mA typical at 5 V / 4 MHz and as low as 1 µA typical in sleep mode at 3 V / 32 kHz, enabling battery-friendly designs. The PIC16C65B is commonly deployed in motor control (H-bridge drivers, small BLDC controllers), industrial sensor interfaces (4-20 mA loops, RTD conditioning boards), automotive body electronics (mirror controllers, HVAC actuators), appliance control (washing machine front panels, oven timers), and embedded security panels requiring deterministic 8-bit control. A key design consideration for the PIC16C65B is its OTP program memory: since firmware is locked in after programming, the device cannot be re-flashed in-circuit. Engineers should plan for factory programming via the MPLAB PM3 or equivalent programmer and verify firmware thoroughly before committing to production. This page synthesizes distributor pricing, same-package drop-in alternatives within the PIC16C65B family, and practical design notes that complement the Microchip datasheet.

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PIC16C65B-04I/L

PIC16C65B-04I/L - 8-Bit 4MHz OTP MCU, 7KB | Microchip

The Microchip PIC16C65B-04I/L is an 8-bit CMOS microcontroller from the PIC16CXX mid-range family, offering 7KB of One-Time-Programmable (OTP) program memory (4K x 14 words), 192 bytes of RAM, and 33 digital I/O pins in a 44-pin PLCC package. Operating at up to 4 MHz, it executes instructions in a 200 ns single-cycle, with only 35 single-word instructions to learn, making it one of the most accessible 8-bit MCU architectures for legacy and industrial designs. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a microcontroller that processes 8-bit data words and uses one-time-programmable non-volatile memory for program storage. OTP means each bit cell can be programmed once but cannot be electrically erased, which lowers die cost versus Flash while still delivering non-volatile code retention. In the broader hierarchy: microcontroller -> 8-bit MCU -> OTP (one-time-programmable) memory MCU -> embedded controller -> semiconductor. The PIC16CXX mid-range family was historically the workhorse of the PIC ecosystem, bridging early EPROM PICs (16C5x) and later Flash-based PIC16F parts. Key features of the PIC16C65B-04I/L include a 4 MHz maximum clock input, 200 ns instruction cycle, 7KB OTP program memory, 192 bytes of RAM, 33 I/O pins, and an industrial temperature grade (-40C to +85C) signified by the 'I' suffix. The 44-pin PLCC ('L') package is a plastic leaded chip carrier with J-leads, suitable for through-hole sockets and through-hole PCB assembly, which remains common in factory automation, motor control boards, and legacy instrumentation. The '04' suffix indicates the 4 MHz speed grade. Architecturally, the PIC16C65B uses a Harvard RISC core with separate program and data buses, a 14-bit instruction word, and a 35-instruction set that simplifies firmware development. Peripherals on this mid-range core typically include three timers (Timer0/1/2), a Capture/Compare/PWM (CCP) module, a USART for asynchronous serial communication, and an 8-bit ADC. The wide operating voltage range (2.5V to 6.0V) and low-power SLEEP mode make it suited for both line-powered and battery-influenced designs. Typical applications include industrial control panels, HVAC fan/blower controllers, motor-drive interfaces, vending machine controllers, automotive body electronics subsystems (non-safety), instrumentation front-ends, and legacy embedded upgrades where drop-in replacement of older PIC16C6x/7x devices is required. Engineers often choose it for long-life industrial platforms because OTP-programmed parts ship with locked firmware and require no in-field reprogramming. Design consideration: OTP parts cannot be reprogrammed, so verify firmware with a windowed/UV-erasable PIC16C65B-04I/PJW variant or an equivalent Flash-based PIC16F876A (in PLCC-44 adapter) during development. Brown-out reset (BOR) and watchdog timer (WDT) configurations should be locked at programming time; once programmed they cannot be re-enabled. This page synthesizes distributor pricing, drop-in PLCC-44 alternatives, and practical design notes not collected in a single place in the Microchip datasheet.

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PIC16C65B-04I/P

PIC16C65B-04I/P - 8-Bit 4MHz 7KB OTP MCU 40-PDIP | Microchip

The Microchip Technology PIC16C65B-04I/P is an 8-bit CMOS microcontroller from the PIC16CXX mid-range family, featuring 7KB (4K x 14) One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and 33 digital I/O pins in a 40-pin PDIP (Plastic DIP) package rated for the industrial temperature range (-40C to +85C). It operates at 4 MHz from a 2.5V to 6.0V supply and integrates the classic PIC16C6x peripheral set, including three timer modules, two capture/compare/PWM modules, a synchronous serial port (SSP) supporting SPI and I2C, a USART, an 8-bit parallel slave port, and an 8-channel 8-bit A/D converter. Background: A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and integrated peripherals. PIC microcontrollers from Microchip employ a Harvard RISC architecture with separate program and data buses, which allows single-cycle instruction execution (except program branches, which take two cycles). The PIC16C mid-range family — the lineage to which the PIC16C65B belongs — provides a low-cost entry point with a 14-bit instruction word, 35 single-word instructions, and a peripheral-rich architecture that targets embedded control applications from appliance timers to industrial sensor interfaces. Key features of the PIC16C65B-04I/P include its OTP EPROM-based program memory (one-time programmable, ideal for mature production designs), a wide operating voltage range from 2.5V to 6.0V, low-power consumption (typical 15 uA at 5V/4 MHz and 1 uA at 3V/32 kHz), a high-performance RISC CPU with only 35 instructions to learn, and a fully static design that allows clock frequencies down to DC. The 4 MHz maximum clock speed makes this part the lowest-speed member of the PIC16C65B family (compared to 10 MHz and 20 MHz variants) and is typically selected for cost-sensitive, low-speed control loops. Typical applications for the PIC16C65B-04I/P include industrial sensor conditioning front-ends, appliance controllers (washing machines, microwave ovens, HVAC), automotive body electronics (non-safety subsystems), instrumentation with analog sensor inputs, and legacy embedded designs that require OTP memory and a parallel slave port for inter-MCU communication. The integrated 8-bit ADC simplifies designs that read potentiometers, temperature sensors, or analog transducers directly. When designing with the PIC16C65B-04I/P, note that OTP memory is one-time-programmable and cannot be erased; for prototyping and field-upgradable designs consider a Flash-based PIC16F6x or PIC18F equivalent in the same PDIP-40 footprint. Industrial temperature rating (-40C to +85C) is suitable for outdoor enclosures and factory environments. Always confirm oscillator configuration and watchdog timer settings in MPLAB before committing to OTP programming. This page synthesizes distributor pricing, drop-in alternatives in the same 40-PDIP package, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C65B-04I/PQ

PIC16C65B-04I/PQ - 8-Bit 4MHz MCU 7KB OTP 33 I/O | Microchip

The Microchip Technology PIC16C65B-04I/PQ is a member of the PIC16CXX mid-range microcontroller family, integrating an 8-bit CPU core running at 4 MHz with 7 KB of One-Time-Programmable (OTP) program memory (4K x 14 words) and 192 bytes of RAM, housed in a 44-pin MQFP package (10x10 mm body). The 'B' silicon revision adds a 5-channel 8-bit analog-to-digital converter (ADC), a USART, and a parallel slave port alongside two capture/compare/PWM (CCP) modules, broadening the device's applicability beyond the baseline PIC16C65. A microcontroller (MCU) is a single-chip computer containing a processor core, program and data memory, and peripheral interfaces. Within the broader semiconductor taxonomy, an MCU sits below microprocessor (MPU) and above DSP and ASIC in system-integration depth. The PIC16CXX mid-range family is one of Microchip's foundational 8-bit lines, characterized by a 14-bit instruction word and Harvard architecture - meaning separate program and data buses - delivering deterministic interrupt latency and compact code density relative to von-Neumann 8-bit alternatives. Key features include 33 digital I/O pins arranged across multiple ports (PORTB through PORTE), two 8-bit timer/counters plus one 16-bit timer/counter, a synchronous serial port (SSP) supporting SPI and I2C master/slave modes, and a brown-out reset (BOR) circuit. The industrial temperature grade ('I' suffix) guarantees operation from -40 C to +85 C, while the 04 speed grade denotes a 4 MHz maximum oscillator input. The OTP memory architecture supports prototype runs and low-to-medium volume production where flash reprogrammability is not required. Architecturally, the PIC16C65B uses a Harvard bus with a 14-bit program word and 8-bit data path, achieving single-cycle instruction execution except for branches. The 4 MHz oscillator combined with a 4:1 internal divider yields a 1 MHz instruction clock, with 1 MIPS sustained throughput. Brown-out reset, watchdog timer, and power-on reset are integrated, reducing external component count in cost-sensitive designs. Typical applications include industrial automation controllers, embedded instrumentation with the on-chip ADC, motor control via the CCP PWM outputs, point-of-sale terminals, and legacy embedded systems where PIC16C-series firmware is already deployed. The OTP memory makes the device well-suited to production runs once firmware is finalized. When designing with this part, verify that the 4 MHz oscillator limit is compatible with required throughput, and ensure the OTP memory strategy aligns with production volume - if firmware updates are anticipated, choose the PIC16F-series flash equivalent. The MQFP package requires a minimum 1 oz copper pour and thermal vias for reliable operation above 25 C ambient. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C65B-04I/PT

PIC16C65B-04I/PT - 8-bit OTP MCU, 4MHz, 7KB, 44-TQFP | Microchip

The Microchip PIC16C65B-04I/PT is an 8-bit, low-cost, high-performance CMOS, fully-static, OTP (One-Time-Programmable) microcontroller from the PIC16CXX mid-range family, delivering 4 MHz maximum clock input and 7 KB (4K x 14 words) of program memory in a 44-pin TQFP (10x10 mm) package. It features the high-performance RISC CPU with only 35 single-word instructions to learn, single-cycle execution for all instructions except program branches (which are two cycles), and 200 ns instruction cycle at 4 MHz. An OTP/EPROM microcontroller is a class of programmable logic device whose program memory is written once via an external programmer and then becomes non-volatile. PIC16CXX mid-range parts sit at the low-cost, peripheral-rich tier of Microchip's 8-bit portfolio - above the baseline PIC16C5X family and below the PIC17CXX/PIC18CXX high-performance tier - and are well known for migrating code easily across 28- to 40-pin variants. They serve as general-purpose embedded controllers where cost, deterministic timing, and ease of programming outweigh the need for in-system re-flash capability. Key features include 192 bytes of RAM, 33 digital I/O pins, 8-channel 8-bit ADC, USART with SPI/I2C master mode, two Capture/Compare/PWM modules, and a watchdog timer. The 'I' suffix denotes the industrial operating temperature range of -40C to +85C. The 04 speed grade specifies a 4 MHz maximum oscillator input. The /PT suffix designates the 44-pin TQFP (Thin Quad Flat Pack) surface-mount package, supplied in tray. Typical applications include industrial control systems, sensor interfacing, motor control (low-end DC and stepper drivers), security and alarm panels, automotive body electronics, and general-purpose embedded controllers where code is finalized at production and OTP cost savings outweigh flash reprogrammability. As an EPROM/OTP part, it is also widely used in educational settings to teach RISC embedded programming. When designing with PIC16C65B-04I/PT, ensure the oscillator selection matches the application clock speed, since the '04' grade tops out at 4 MHz. The 44-TQFP footprint provides ample I/O (33 pins) for parallel bus expansion, multiple UART/SPI channels, and analog sensing arrays. Watchdog timer must be either enabled in firmware or disabled in configuration to avoid unintended resets. This page consolidates distributor pricing, drop-in alternatives, and engineering notes not bundled in the manufacturer datasheet.

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PIC16C65B-04I/PQ - 8-Bit 4MHz MCU 7KB OTP 33 I/O | Microchip

PIC16C65B-04I/PT - 8-bit OTP MCU, 4MHz, 7KB, 44-TQFP | Microchip