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PIC16C65AT-10I/L - 8-Bit PIC MCU, 7KB EPROM, 33 I/O, PLCC-44 | Microchip
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 - 8-bit PIC MCU, 7KB OTP, 10MHz, 44-QFP | Microchip
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 - 8-bit OTP MCU, 7KB, 192B RAM, 33 I/O, 44-TQFP
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 - 8-Bit 20MHz OTP MCU 7KB Flash | Microchip
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 - 8-bit OTP MCU 7KB Flash 20MHz 44-TQFP | Microchip
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 - 8-Bit 20MHz OTP MCU 7KB | Microchip PLCC-44
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 - 8-Bit 20MHz OTP MCU 7KB | Microchip
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 - 8-Bit OTP MCU, 7KB, 33 I/O | Microchip
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 - 8-Bit OTP MCU, 4MHz, 7KB DIP-40 | Microchip
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 - 8-Bit 4MHz 7KB OTP MCU 44-MQFP | Microchip
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 - 8-Bit CMOS OTP MCU, 4MHz, 7KB | Microchip
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 - 8-bit 4MHz OTP MCU 7KB Flash 40-PDIP | Microchip
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 - 8-Bit 4MHz OTP MCU, 7KB, 44-MQFP | Microchip
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 - 7KB OTP 8-Bit MCU, 4MHz, TQFP-44 | Microchip
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 - 8-Bit 4MHz OTP MCU, 7KB | Microchip
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 - 8-Bit 4MHz 7KB OTP MCU 40-PDIP | Microchip
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 - 8-Bit 4MHz MCU 7KB OTP 33 I/O | Microchip
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 - 8-bit OTP MCU, 4MHz, 7KB, 44-TQFP | Microchip
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-20/PQ - 8-Bit 20MHz 7KB OTP MCU | Microchip
PIC16C65B-20/PQ

PIC16C65B-20/PQ - 8-Bit 20MHz 7KB OTP MCU | Microchip

The Microchip Technology PIC16C65B-20/PQ is an 8-bit CMOS RISC 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 pins, housed in a 44-pin MQFP (10x10 mm) surface-mount package. It executes instructions at a 20 MHz clock rate using a 14-bit wide instruction word architecture and is specified for commercial temperature operation from 0C to +70C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable peripherals into one IC. PIC microcontrollers use a Harvard architecture with separate program and data buses, an accumulator-based ALU, and a small instruction set. The 8-bit PIC mid-range family targets cost-sensitive embedded control in appliances, automotive body electronics, and industrial sensor interfaces where deterministic instruction timing and low part count matter more than raw compute throughput. Key features include 33 digital I/O lines arranged across multiple ports (PORTA-PORTE), dual 8-bit timers plus one 16-bit timer, a Universal Synchronous Asynchronous Receiver Transmitter (USART), a Synchronous Serial Port (SSP) supporting SPI and I2C master/slave modes, and parallel slave port operation. An 8-channel 8-bit analog-to-digital converter is not present on this derivative, so the part targets purely digital designs. On-chip power-on reset, brown-out reset, watchdog timer with dedicated on-chip RC oscillator, and code protection support robust standalone deployment. The PIC16C65B uses Microchip's mature CMOS process with an OTP EPROM program array, offering a 1,000 erase/write cycle minimum and indefinite read endurance. Code is programmed once by the user using a device programmer such as the MPLAB PM3. The 20 MHz part delivers a 200 ns instruction cycle, suitable for real-time control loops, keypad scanning, LED multiplexing, and protocol bridging where deterministic timing outperforms larger 32-bit cores that pay overhead for interrupts and pipelines. Typical applications include industrial control panels, HVAC fan controllers, vending machine logic, security alarm keypads, automotive instrument cluster logic, and consumer appliance interface boards. The 33 I/O and USART/SSP combination lets engineers drive segment displays, matrix keypads, EEPROMs, sensors, and host serial links from a single 5V supply. Designers should note that the OTP variant is one-time-programmable: any code revision requires a new device. Use the PIC16F877 (flash-based, same family migration path) for prototyping and field-updatable products; reserve the PIC16C65B for high-volume production once firmware is frozen. This page synthesizes distributor pricing, same-package pin-compatible drop-in alternatives, and application engineering notes for engineers evaluating the PIC16C65B-20/PQ for new designs or end-of-life redesigns.

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PIC16C65B-20E/L - 8-Bit 20MHz CMOS OTP MCU, 7KB EPROM, PLCC-44
PIC16C65B-20E/L

PIC16C65B-20E/L - 8-Bit 20MHz CMOS OTP MCU, 7KB EPROM, PLCC-44

The Microchip PIC16C65B-20E/L is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC16CXX mid-range family, operating at up to 20 MHz and packaged in a 44-pin PLCC (Plastic Leaded Chip Carrier) tube format. The device integrates 7 KB of EPROM program memory, 192 bytes of RAM, and a rich peripheral set including three timers, two capture/compare/PWM modules, a synchronous serial port (SSP), a USART, an 8-bit parallel slave port, and an 8-channel 8-bit ADC. A PIC16CXX mid-range microcontroller is an 8-bit RISC (Reduced Instruction Set Computer) device that executes most instructions in a single clock cycle, designed for embedded control applications requiring deterministic timing, low power consumption, and integrated peripherals. PIC microcontrollers sit within the broader taxonomy of: microcontroller -> embedded controller -> single-chip computer -> semiconductor IC. Key features of the PIC16C65B include wide operating voltage range from 2.5V to 6.0V, low-power consumption (typically 15 µA at 5V/4 MHz and 1 µA at 3V/32 kHz), fully static design, and commercial, industrial, and extended temperature ranges. The -20E speed grade designates a 20 MHz maximum oscillator frequency with the extended (E) temperature range, while /L denotes the PLCC-44 lead-form package. The PIC16C65B architecture uses a 14-bit instruction word with separate program and data buses (Harvard architecture), enabling simultaneous instruction fetch and data access. The device offers 33 single-word instructions and a 15-level deep hardware stack, with up to 8K x 14 words of program memory addressable. Typical applications include industrial control systems, motor control, instrumentation, automotive subsystems, and embedded control boards requiring parallel-slave-port based host expansion. The wide voltage range and low-power modes make the PIC16C65B well-suited for both line-powered and battery-operated designs. When designing with this device, note that OTP memory cannot be electrically erased; production programming must be performed before final PCB assembly. Designers targeting field-updateable firmware should consider Flash-based PIC16F family equivalents such as the PIC16F877A in a compatible package footprint. This page synthesizes verified distributor pricing, same-brand drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, helping engineers rapidly qualify the PIC16C65B-20E/L for both new designs and legacy maintenance.

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PIC16C65B-20E/P - 8-Bit OTP MCU 7KB 20MHz DIP-40 | Microchip
PIC16C65B-20E/P

PIC16C65B-20E/P - 8-Bit OTP MCU 7KB 20MHz DIP-40 | Microchip

The Microchip Technology PIC16C65B-20E/P is a high-performance, 8-bit CMOS OTP microcontroller in the PIC16C mid-range family, featuring 7 KB of program memory, 192 bytes of RAM, a 20 MHz maximum CPU clock, and a 40-pin PDIP through-hole package. It supports a wide operating voltage range from 2.5 V to 6.0 V and three temperature grades (commercial, industrial, automotive/extended) for maximum deployment flexibility. The 20 suffix indicates 20 MHz operation and the E suffix indicates the extended automotive temperature grade of -40°C to +125°C, while the /P suffix denotes a PDIP package. A microcontroller (MCU) is a single-chip computer containing a CPU, memory, and programmable I/O peripherals. The PIC16C65B belongs to Microchip's mid-range PIC16C architecture, which sits between the baseline PIC10/12/16 families and the enhanced PIC18 family. The 65B is a one-time-programmable (OTP) variant using EPROM technology, which historically enabled high-volume, low-cost embedded designs that did not require firmware field updates. It shares its instruction set and peripheral set with the PIC16C63A, 73B, and 74B siblings, making it part of a scalable, code-compatible product family. Key features include 33 digital I/O pins, three 8-bit timer/counters (Timer0, Timer1, Timer2), two capture/compare/PWM modules, a USART for serial communication, an 8-bit parallel slave port, and a watchdog timer with its own on-chip RC oscillator. Power consumption is exceptionally low: typical operating current is 15 µA at 5 V/4 MHz and only 1 µA in standby at 3 V/32 kHz, supporting battery-powered applications. The device provides 15 interrupt sources and a fully static CMOS design that permits operation down to DC clock rates. The PIC16C65B integrates a RISC architecture with 35 single-word instructions, 200 ns instruction execution time at 20 MHz, a 14-bit instruction word, and an 8-bit data path. It uses a Harvard architecture with separate program and data buses, two 8-bit file select registers, and a hardware stack of eight levels for subroutine/interrupt nesting. The internal oscillator mode is not provided on this OTP device; it requires an external crystal, resonator, or RC clock source on OSC1/OSC2. Typical applications include industrial control panels, automotive body and chassis ECUs, instrumentation, motor control front-ends, and embedded serial communication gateways. Its automotive grade and OTP cost structure also make it a fit for high-volume appliance control and HVAC control modules. Designers choose this part when code is finalized and low per-unit cost is more important than field re-programmability. A key design consideration is that OTP cannot be electrically re-programmed; any code change after programming requires a new device, so verification must be done on a windowed or flash-equivalent part (such as PIC16F877) during prototyping. Also, since this part is in the legacy OTP product line, lifecycle availability is constrained compared to flash PIC16F replacements - validate supply before committing to a new design.

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PIC16C65B-20I/L - 8-bit 20MHz OTP MCU, 7KB | Microchip
PIC16C65B-20I/L

PIC16C65B-20I/L - 8-bit 20MHz OTP MCU, 7KB | Microchip

The Microchip Technology PIC16C65B-20I/L is an 8-bit CMOS RISC microcontroller from the PIC16CXX mid-range family, delivering 20 MHz maximum clock speed with a 200 ns instruction cycle and 7 KB (4K x 14) of One-Time-Programmable (OTP) program memory. Housed in a 44-pin PLCC package (16.59 x 16.59 mm), the device provides 192 bytes of RAM, 33 digital I/O pins, and a 5 V operating voltage with the industrial-temperature -40C to +85C grade denoted by the "I" suffix. An 8-bit microcontroller (MCU) is a small, self-contained computing device built around an 8-bit data bus, integrating a CPU, program memory, RAM, and peripherals such as timers, communication interfaces, and I/O. The PIC16CXX mid-range family uses a Harvard RISC architecture that executes most instructions in a single 200 ns cycle, making these MCUs cost-effective deterministic controllers for embedded systems that do not require the horsepower of 32-bit cores. The PIC16C65B-20I/L sits in the linear-regulator and motor-control hierarchy as a reliable industrial-grade controller, and it belongs to the broader Power Management and Embedded Control semiconductor ecosystem. Key features include 35 single-word instructions to learn, all single-cycle except program branches (two cycles), Brown-out Detect/Reset, Power-on Reset (POR), Watchdog Timer (WDT), Pulse Width Modulation (PWM) peripherals, and three timer modules. The OTP program memory means each device can be programmed only once, which suits high-volume production but makes the part effectively obsolete for prototyping or design-iteration workflows. The "L" suffix denotes the lead-bearing PLCC-44 package, while the "I" denotes the industrial -40C to +85C temperature range. Typical applications include industrial automation controllers, automotive body and chassis electronics, consumer appliance control boards, and legacy embedded systems. The 33 I/O pins comfortably drive LED arrays, keypads, and small relays, while the PWM module supports DC motor speed control and lighting dimming. Its robust peripheral set and wide operating voltage tolerance make it a long-life favorite for harsh-environment industrial designs where flash-based microcontrollers are not required. When designing with PIC16C65B-20I/L, plan for OTP-only programming - any code change requires a new device, raising development risk. Verify oscillator configuration and decoupling layout per the Microchip mid-range reference manual, and budget a socketed programming adapter since the PLCC-44 form factor is uncommon in modern designs. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, supporting both legacy maintenance and new BOM decisions as of 2026-09-18.

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PIC16C65B-20I/P - 8-Bit 20MHz OTP MCU, 7KB EPROM, 40-PDIP | Microchip
PIC16C65B-20I/P

PIC16C65B-20I/P - 8-Bit 20MHz OTP MCU, 7KB EPROM, 40-PDIP | Microchip

The Microchip Technology PIC16C65B-20I/P is an 8-bit CMOS OTP (One-Time Programmable) microcontroller from the PIC16CXX mid-range family, delivering 20 MHz maximum clock speed, 7 KB (4K x 14) of EPROM program memory, and 192 bytes of RAM in a 40-pin PDIP through-hole package. According to the manufacturer datasheet, it executes instructions in a single 200 ns cycle (except program branches which take two cycles) and offers 33 digital I/O lines organized across multiple ports. The device operates from 4.0 V to 5.5 V across the industrial temperature range of -40C to +85C and consumes only 15 uA typical at 5 V/4 MHz and 1 uA typical at 3 V/32 kHz. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripheral interfaces on one die, forming the lowest tier of the embedded computing hierarchy (microcontroller -> embedded processor -> microprocessor -> computing platform). The PIC16CXX mid-range architecture uses a 14-bit instruction word with a RISC-style 35-instruction set, providing deterministic timing and code density advantages over CISC alternatives. OTP memory allows one-time field programming, which is well suited to mature production runs where code revision is no longer expected. Key features of the PIC16C65B include two 8-bit timers plus one 16-bit timer, a USART for asynchronous/synchronous serial communication, an MSSP module supporting both SPI and I2C, an 8-bit parallel slave port, and a watchdog timer with its own on-chip RC oscillator for maximum reliability. Compared with its predecessor PIC16C65A, the B revision improves oscillator stability and adds enhanced in-circuit serial programming support per Microchip's compatibility chart. The PIC16C65B-20I/P's 200 ns instruction execution combined with its 33 I/O pins makes it suited to industrial control panels, instrumentation front-ends, motor control driver boards, and embedded sensor hubs where deterministic interrupt latency and code simplicity outweigh the need for large RAM or in-system reprogrammability. Its wide 4.0-5.5 V supply window tolerates noisy industrial 5 V rails. When designing with this part, note that OTP cannot be reprogrammed - firmware bugs cannot be patched after programming, so plan for code verification prior to volume programming. Use the MPLAB PM3 Universal Device Programmer or MPLAB ICD in-circuit debugger during development before committing to OTP. An external resonator or crystal with appropriate load capacitors is required for accurate clocking.

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PIC16C65B-20I/PT - 8-Bit 20MHz OTP MCU 7KB | Microchip
PIC16C65B-20I/PT

PIC16C65B-20I/PT - 8-Bit 20MHz OTP MCU 7KB | Microchip

The Microchip Technology PIC16C65B-20I/PT is a member of the PIC16C mid-range 8-bit microcontroller family, offering up to 20 MHz operation, 7 KB (4K x 14) of One-Time Programmable (OTP) program memory and 192 bytes of RAM, all housed in a 44-pin TQFP (10x10 mm) surface-mount package with 33 digital I/O pins. An 8-bit PIC microcontroller (MCU) is a RISC-based single-chip computer built around a Harvard architecture that separates program and data memory buses, enabling single-cycle instruction fetch and deterministic interrupt latency. PIC microcontrollers sit within a broader hierarchy of embedded controllers: microcontroller -> 8-bit MCU -> PIC16C family -> PIC16C6x mid-range group. They integrate CPU core, non-volatile program memory, RAM, peripherals and I/O on a single die, replacing dozens of discrete logic devices in legacy embedded designs. Key features of the PIC16C65B-20I/PT include a 20 MHz maximum clock (50 ns instruction cycle), an industrial -40C to +85C operating temperature range (denoted by the "I" suffix), 8 channels of 8-bit analog-to-digital conversion, two 8-bit and one 16-bit timer/counter, a universal synchronous/asynchronous receiver-transmitter (USART), a serial peripheral interface (SPI) port, and a master/slave inter-integrated circuit (I2C) bus. The OTP EPROM program memory enables prototype-to-production migration without mask charges, and the wide 2.5V to 5.5V supply range simplifies battery-backed and 5V-rail designs. The PIC16C65B-20I/PT uses a 14-bit instruction word and 35 single-cycle instructions, delivering throughput comparable to early 16-bit controllers while retaining 8-bit data path economy. Its enhanced mid-range core supports hardware multiply (single-cycle 8x8) and prioritised interrupt handling, while the brown-out reset and power-on reset blocks harden the device against unstable supply rails common in industrial enclosures. Typical applications include industrial process control and sensor-interface modules, HVAC fan and damper controllers, automotive body-electronics subsystems (instrument clusters, seat controllers), appliance user-interface boards, security-system keypads and access-control panels, and legacy printer/scanner head controllers. The 33 I/O pins provide ample connectivity for keypad scanning, LED/LCD driving, and parallel sensor arrays. A primary design consideration for the PIC16C65B-20I/PT is that OTP memory cannot be reprogrammed in-circuit - use a Flash-based PIC16F equivalent (e.g. PIC16F877A-I/PT) for development iteration or field firmware updates. The TQFP-44 footprint is widely second-sourced across the PIC16C6x family. This page synthesises current distributor pricing, datasheet specifications, drop-in alternatives and practical design notes not consolidated on the manufacturer datasheet, helping procurement and firmware engineers accelerate BOM selection and PCB bring-up.

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