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PIC16F631-I/ML - 8-Bit 20MHz 1.75KB Flash MCU | Microchip QFN-20
PIC16F631-I/ML

PIC16F631-I/ML - 8-Bit 20MHz 1.75KB Flash MCU | Microchip QFN-20

The Microchip Technology PIC16F631-I/ML is an 8-bit flash-based CMOS microcontroller from the PIC® 16F mid-range family, featuring a 20 MHz CPU clock, 1.75 KB (1K x 14) of flash program memory, 128 bytes of RAM, and 64 bytes of EEPROM data memory, all housed in a 20-pin QFN (4x4 mm) package. It integrates a 10-bit ADC, two comparators, enhanced PWM/capture/compare modules, and nanoWatt Technology for ultra-low-power operation. The device operates across 2.0 V to 5.5 V supply voltages and supports up to 11 digital I/O pins, making it suitable for compact embedded designs. A microcontroller (MCU) is a single-chip computer containing a processor core, program and data memory, and programmable I/O peripherals. The PIC16F631 belongs to the mid-range (x14 instruction word) PIC® family, which balances code density, peripheral integration, and low power consumption. Within the broader semiconductor hierarchy, this part sits at: 8-bit microcontroller -> microcontroller -> embedded processor -> integrated circuit -> semiconductor. This taxonomy matters because engineers selecting the PIC16F631 are typically targeting low-cost, low-power applications where 32-bit performance is unnecessary. Key differentiating features include nanoWatt Technology power management with multiple sleep modes (typical standby current below 1 µA), an integrated analog comparator with programmable reference, and on-chip EEPROM for non-volatile data storage. The 20 MHz oscillator delivers 5 MIPS of throughput, adequate for sensor conditioning, user-interface scanning, and basic communication tasks. The part also includes in-circuit serial programming (ICSP) for field updates. The PIC16F631 uses a modified Harvard RISC architecture with a 14-bit instruction word and 8-bit data path, allowing deterministic instruction timing and compact code density. Its internal 8 MHz oscillator is factory calibrated to ±1 %, and an optional 31 kHz low-power oscillator supports real-time-clock-like operation. Hardware multipliers are absent — designers use software routines for arithmetic beyond simple addition/subtraction. Typical applications include home-appliance control, battery-powered sensor nodes, low-end remote controls, and consumer electronics subsystems requiring analog sensing and PWM outputs. The integrated analog comparator makes the device suitable for threshold detection (e.g., battery monitors, light sensors) without external op-amps. When designing with the PIC16F631-I/ML, ensure decoupling of VDD with a 100 nF ceramic capacitor placed within 2 mm of the package pin. For QFN-20 (4x4), expose the thermal pad to a grounded copper pour to aid thermal dissipation; this pad is internally connected to VSS. Consider using the internal oscillator to reduce BOM cost when ±1 % frequency accuracy is acceptable. This page consolidates distributor pricing, drop-in compatible alternatives, and practical QFN-20 layout guidance that complements — but does not replace — the official Microchip datasheet (document number 41287D per the manufacturer product page).

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PIC16F631-I/P - 20MHz 8-Bit Flash MCU | Microchip Technology
PIC16F631-I/P

PIC16F631-I/P - 20MHz 8-Bit Flash MCU | Microchip Technology

The Microchip Technology PIC16F631-I/P is an 8-bit CMOS flash-based PIC microcontroller with a 20 MHz clock, 1.75 KB of program memory, 64 bytes of RAM, and 11 I/O ports in a 20-pin PDIP package. It is designed for compact embedded-control systems requiring deterministic instruction execution, integrated EEPROM data memory, and a low pin count. An 8-bit microcontroller is a programmable control IC that integrates a CPU core, program memory, data memory, I/O, timers, and communication peripherals on one semiconductor device. PIC16 devices use the mid-range PIC architecture with a compact instruction set and flash-based programming, placing them between simple fixed-function controllers and larger general-purpose microcontrollers. The PIC16F631 is specifically suited to industrial, consumer, appliance, sensor, and small motor-control designs. Key features include 20 MHz operation, 1.75 KB of flash program memory, 64 bytes of RAM, on-chip EEPROM data memory, 11 I/O ports, and an operating supply range stated as 4.5 V to 5.5 V in the retrieved product data. The -I grade indicates the industrial-temperature ordering variant, while /P identifies the PDIP package. The 20-pin through-hole format supports prototyping, repairability, and conventional PCB assembly. The PIC16F631-I/P combines a simple 35-instruction architecture with 200 ns instruction execution, as stated in the retrieved FindIC description. Its integrated peripherals reduce external component count, while flash memory permits firmware updates without replacing the device. Engineers should verify exact peripheral, electrical, timer, and programming details against the Microchip manufacturer datasheet before final schematic and firmware release. Typical uses include digital control panels, sensor interfaces, small motor controllers, LED sequencing, battery-powered devices, industrial automation modules, and compact consumer appliances. Its 20 MHz performance and modest memory footprint make it suitable for real-time state machines and modest protocol handling, but not complex graphics, high-bandwidth connectivity, or large data logging. For PCB design, preserve the manufacturer’s recommended decoupling and programming interface, and do not assume that a same-package related PIC is automatically firmware- or peripheral-compatible. This page combines distributor references, the Microchip datasheet link, and explicitly marked data gaps to support engineering selection.

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PIC16F631-I/SO - 20MHz 8-Bit Flash MCU, 1.75KB | Microchip
PIC16F631-I/SO

PIC16F631-I/SO - 20MHz 8-Bit Flash MCU, 1.75KB | Microchip

The Microchip Technology PIC16F631-I/SO is an 8-bit Flash-based CMOS microcontroller from the PIC® mid-range family with nanoWatt technology, delivering 20 MHz CPU performance, 1.75 KB (1K x 14) of Flash program memory, and 64 bytes of RAM in a 20-pin SOIC package. The "I" suffix indicates the industrial temperature grade (-40C to +85C), while the "/SO" suffix denotes the 300-mil SOIC-20 surface-mount package. A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, I/O peripherals, and timers on one integrated circuit. The PIC16F631 belongs to the low pin-count (20-pin) subset of Microchip's mid-range x14 architecture, standardizing on 35 instructions, an 8-level hardware stack, and a wide 2.0-5.5 V operating voltage range that makes it well suited to both 3.3 V and 5 V designs. Key features include 18 I/O pins capable of driving LEDs directly, an internal oscillator selectable from 31 kHz to 8 MHz via OSCCAL calibration, a 10-bit ADC with up to 12 channels depending on package, dual comparators, an enhanced PWM/capture/compare module, and an onboard EEPROM data memory block. The nanoWatt technology provides multiple power-managed modes (RUN, IDLE, SLEEP) that drop quiescent current into the microamp range for battery-powered applications. Typical applications include small appliance control, sensor signal conditioning, LED driver sequencing, battery chargers, remote-control transmitters, and industrial logic replacement. With its broad operating voltage and on-chip EEPROM for nonvolatile parameter storage, the PIC16F631 is frequently chosen as a cost-optimized glue logic replacement in place of discrete analog components. A core consideration when designing with this MCU is that it does NOT have a hardware UART; designers needing asynchronous serial must implement a software bit-banged UART, which constrains it versus PIC16F88x or PIC16F1xxx family members. Programming is performed via In-Circuit Serial Programming (ICSP) through the ICSPCLK/ICSPDAT pins, requiring two signal lines plus VPP/MCLR/VSS during programming.

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PIC16F631-I/SS - 8-Bit MCU, 20MHz, 1.75KB Flash, SSOP-20 | Microchip
PIC16F631-I/SS

PIC16F631-I/SS - 8-Bit MCU, 20MHz, 1.75KB Flash, SSOP-20 | Microchip

The Microchip Technology PIC16F631-I/SS is an 8-bit Flash-based CMOS microcontroller from the PIC16F family, offering up to 20MHz CPU speed with 1.75KB (1K x 14) of Flash program memory and 64 bytes of RAM, housed in a 20-pin SSOP package. It is part of the low pin-count (20-pin) PIC® Flash MCU family that delivers a wide operating voltage range of 2.0V to 5.5V, integrated EEPROM data memory, and the nanoWatt technology power management feature set, targeting cost-sensitive industrial and consumer applications. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (Flash/ROM), data memory (RAM), peripheral set (timers, ADC, communication interfaces), and I/O pins on one integrated circuit. PIC microcontrollers use Microchip's enhanced mid-range 8-bit RISC architecture with only 35 single-cycle instructions (excluding branches), making them easy to program and debug. PIC MCUs belong to the broader category of embedded controllers within the semiconductor device hierarchy: microcontroller -> embedded processor -> integrated circuit -> semiconductor. Key features include 11 I/O pins, an internal oscillator, a comparator module, an Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART), and nanoWatt power-saving modes. The integrated Flash program memory supports in-circuit serial programming (ICSP), enabling firmware updates after PCB assembly. The device includes a 10-bit ADC (on related family members), though the PIC16F631 variant omits the ADC to optimize cost for applications needing only digital I/O and timing. The PIC16F631-I/SS uses a Harvard bus architecture with separate program and data memory buses, plus a 14-bit instruction word optimized for compact code density. The wide 2.0V-5.5V supply range allows direct operation from a single Li-Ion cell, two AA cells, or a regulated 3.3V/5V rail, eliminating the need for multiple voltage rails in cost-sensitive designs. The 'I' suffix indicates the industrial temperature range of -40C to +85C. Typical applications include consumer appliance controls, sensor interface modules, low-cost motor controllers, LED lighting drivers, battery-powered instruments, and white goods user interfaces. The device's combination of small SSOP package, low power consumption, and integrated peripherals makes it especially suitable for space-constrained designs where BOM cost is critical. When designing with the PIC16F631-I/SS, ensure the ICSP clock and data lines (RB6/RB7) are accessible for in-circuit programming. Decouple VDD with a 0.1uF ceramic capacitor placed close to the pin. Use the internal oscillator when crystal accuracy is not required; otherwise provide an external resonator on OSC1/OSC2. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing an information-gain summary that goes beyond a single source.

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PIC16F631T-E/SS - 20-Pin Flash MCU, 1.75KB, nanoWatt | Microchip
PIC16F631T-E/SS

PIC16F631T-E/SS - 20-Pin Flash MCU, 1.75KB, nanoWatt | Microchip

The Microchip Technology PIC16F631T-E/SS is a 20-pin, flash-based, 8-bit CMOS microcontroller from the PIC16 mid-range family, featuring the nanoWatt power-managed architecture and housed in an SSOP package with tape-and-reel packaging. According to the Microchip product page, the device delivers up to 20 MHz CPU performance, integrates 1.75 KB of flash program memory and 64 bytes of EEPROM data memory, and offers 11 digital I/O pins with multiple timer and interrupt sources. A microcontroller (MCU) is a single-chip computer that combines a CPU core, non-volatile program memory, working RAM, and configurable peripherals such as timers, ADC, communication interfaces, and GPIO into one IC. The PIC16 mid-range architecture (also called the x14 architecture) refers to Microchip's mid-tier 8-bit core family that sits between the baseline PIC10/12/16/17 series and the enhanced PIC18 family, providing an instruction-set balance of efficiency, code density, and peripheral integration. Within this hierarchy, the PIC16F631 belongs to the low-pin-count (20-pin) PIC16 sub-family optimized for compact, cost-sensitive embedded designs. Key features include an extended operating temperature range (-40C to +125C), a wide supply voltage window of 2.0 V to 5.5 V, an internal oscillator option to reduce external component count, and nanoWatt technology that delivers dynamic power management through multiple Sleep modes and selectable clock sources. The integrated 64-byte EEPROM provides byte-erasable non-volatile storage for user parameters without consuming flash endurance, which is particularly useful for storing calibration constants or user preferences. The internal architecture uses a Harvard-style RISC engine with a 14-bit instruction word, a hardware stack, and a deterministic interrupt controller. The 11 I/O pins are multiplexed with on-chip peripherals such as comparators, an ADC, timers, and the EUSART module, allowing flexible pin-function remapping. Brown-out reset (BOR), power-on reset (POR), and a watchdog timer (WDT) with its own on-chip low-power oscillator provide three layers of operational safety for unattended or battery-powered deployments. Typical applications include low-cost consumer appliances, white goods control boards, battery chargers, sensor interface modules, LED lighting controllers, and small industrial automation accessories. The wide 2.0 V to 5.5 V supply window also makes the PIC16F631 well suited to two- or three-cell battery-powered products, including remote controls, toys, and personal-care devices. When designing with this MCU, verify that the chosen debugger/programmer (such as PICkit 3, PICkit 4, MPLAB Snap, or ICD 4) supports the device, and respect the in-circuit serial programming (ICSP) pin assignments during PCB layout. Leave adequate guard traces around the analog inputs and provide bulk decoupling near the VDD pin to minimize digital switching noise on sensitive ADC channels. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, including cross-package trade-offs and per-pin function summaries that accelerate schematic capture.

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PIC16F631T-I/ML - 8-Bit MCU, 20MHz, 1.75KB Flash | Microchip
PIC16F631T-I/ML

PIC16F631T-I/ML - 8-Bit MCU, 20MHz, 1.75KB Flash | Microchip

The Microchip Technology PIC16F631T-I/ML is an 8-bit Flash microcontroller from the PIC16F family, featuring a 20MHz CPU, 1.75KB (1K x 14) of program Flash memory, and 64 bytes of RAM, housed in a 20-pin QFN (4x4) package with exposed thermal pad and supplied on tape and reel. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and programmable I/O peripherals on one silicon die. Microcontrollers sit at the bottom of the embedded computing hierarchy (MCU -> embedded processor -> microprocessor -> CPU) and are designed for deterministic, low-power, real-time control tasks. The PIC16F631 belongs to Microchip's well-established mid-range PIC® architecture (often called "mid-range x14"), meaning its instruction width is 14 bits and its core delivers predictable execution timing suitable for direct hardware control. Key features of the PIC16F631T-I/ML include 128 bytes of EEPROM data memory, 11 general-purpose digital I/O pins, an integrated analog comparator, and Microchip's nanoWatt™ power-management technology for ultra-low standby current. The device supports in-circuit serial programming (ICSP) and in-circuit debugging (ICD), so firmware can be updated and debugged without removing the part from the board. The wide 2.0V to 5.5V operating range lets the device run directly from battery sources, regulated 3.3V rails, or 5V supplies, simplifying analog signal-chain interfaces. Typical applications include low-cost consumer appliances, sensor-interface front-ends, battery-powered remote controls, LED lighting controllers, and small industrial control modules. The QFN-20 (4x4) footprint suits space-constrained surface-mount designs where a DIP or SOIC would be too tall or too large. When designing with the PIC16F631, ensure that the exposed thermal pad is properly soldered to a sufficient copper pour (per Microchip layout guidelines) to meet thermal and electrical performance. The "T" suffix indicates tape-and-reel packaging and "I" denotes the industrial -40°C to +85°C temperature range, making the part suitable for harsh-environment deployment. This page synthesizes real-time distributor pricing, qualified drop-in alternatives (same QFN-20 footprint), and design notes that are not bundled in the manufacturer datasheet, so engineers can make sourcing and substitution decisions in one place.

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PIC16F631T-I/SO - 8-bit 20MHz 1.75KB Flash MCU | Microchip
PIC16F631T-I/SO

PIC16F631T-I/SO - 8-bit 20MHz 1.75KB Flash MCU | Microchip

The Microchip Technology PIC16F631T-I/SO is an 8-bit Flash-based CMOS microcontroller from the PIC16F mid-range family, offering 1.75KB (1K x 14) of program Flash memory and 64 bytes of SRAM in a 20-pin SOIC (SO) package with industrial -40C to +85C temperature rating. The part integrates a 20 MHz internal oscillator, supports a wide 2.0V to 5.5V operating range, and provides 18 digital I/O pins with nanoWatt power management for ultra-low standby current. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory (Flash/ROM), peripherals and I/O into one package, optimized for embedded control rather than high-throughput computation. Within the broader taxonomy, the PIC16F631 sits in the microcontroller -> embedded microcontroller -> low-pin-count MCU branch, sharing the standardized Microchip mid-range x14 instruction set with hundreds of other PIC16F variants. This shared ISA allows code developed for one PIC16F device to be ported across the family with minimal toolchain changes, accelerating firmware development for consumer, industrial and appliance designs. Key feature highlights include a 20 MHz maximum CPU clock delivering 5 MIPS, 256 bytes of EEPROM data memory, an enhanced Capture/Compare/PWM (ECCP) module, two analog comparators, and a 10-bit ADC (the ADC count and comparator routing depend on package; on the 20-pin SO the device still exposes the full peripheral set internally). Internal oscillator accuracy plus an on-chip voltage reference simplify BOM cost by removing external crystals in many applications. Architecturally, the device uses a 14-bit instruction word modified Harvard architecture with separate program Flash and data SRAM buses, allowing instruction fetch and data access in the same cycle. The nanoWatt feature set provides multiple idle and sleep modes, peripheral clock gating, and an ultra-low-power watchdog that lets deep-sleep current drop to tens of nA, making the part suitable for battery-powered sensor and metering endpoints. Typical applications include home appliance control boards, battery chargers, LED lighting drivers, industrial sensor interfaces, remote controls, low-cost consumer electronics and white-goods user-interface modules where small footprint, low power and a stable peripheral set are more critical than raw CPU speed. When designing in this part, pay attention to the maximum 20 MHz Fosc at 4.0V to 5.5V (operation below 4.0V is limited to lower Fosc), reserve one I/O pin for in-circuit serial programming (ICSP) using the ICSPDAT/ICSPCLK pair, and place a 0.1uF decoupling capacitor within 5 mm of VDD. The T-suffix and -I/-SO qualifiers indicate tape-and-reel packaging with industrial temperature grade. This page consolidates distributor pricing, pin-compatible drop-in alternatives and practical design notes not aggregated in any single Microchip datasheet.

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PIC16F631T-I/SS - 8-bit 20MHz PIC MCU 1.75KB FLASH SSOP-20
PIC16F631T-I/SS

PIC16F631T-I/SS - 8-bit 20MHz PIC MCU 1.75KB FLASH SSOP-20

The Microchip Technology PIC16F631T-I/SS is an 8-bit RISC microcontroller based on the PIC16 mid-range x14 architecture, offered in a 20-pin SSOP (Shrink Small Outline Package) and supplied on Tape & Reel. According to verified distributor and manufacturer data, it integrates 1.75 KB (1K x 14) of Flash program memory, 64 bytes of data SRAM, 128 bytes of data EEPROM, and runs at up to 20 MHz instruction execution. The 'T' suffix denotes Tape & Reel packaging, and the 'I' indicates the industrial -40C to +85C temperature grade. A PIC microcontroller is a compact microcontroller unit (MCU) built around a Harvard-architecture RISC core with separate program and data buses, widely used in embedded control applications. The PIC16F631 sits within Microchip's mid-range family, which adds interrupt handling, peripherals, and enhanced instructions to the baseline 14-bit instruction set. MCUs like the PIC16F631 are typically categorized hierarchically as: microcontroller -> embedded controller -> semiconductor IC. This family-level context helps engineers compare against competing 8-bit families such as the Atmel AVR or NXP HC08. Key differentiating features include 11 I/O pins supporting digital and analog functions, an internal oscillator with selectable frequency options, a 10-bit A/D converter (ADC) with multiple input channels, and nanoWatt technology for ultra-low sleep current. The device supports an operating voltage range of 2.0 V to 5.5 V, two comparators, capture/compare/PWM (CCP) module, and on-chip EEPROM for non-volatile data storage - features that exceed many competing 14/20-pin MCUs in integrated peripheral count. The PIC16F631T-I/SS uses Microchip's mid-range 14-bit instruction set with a hardware stack and single-cycle branching, providing deterministic interrupt response and predictable timing. The on-board debug support via ICD and the ICSP (In-Circuit Serial Programming) interface simplify firmware development and in-field updates without external programming hardware. Typical applications include low-cost consumer electronics, white goods, motor control in small BLDC drivers, sensor signal conditioning, LED lighting control, remote controls, and battery-powered IoT edge nodes where nanoWatt sleep modes extend battery life. The wide 2.0V-5.5V supply range supports direct Li-ion battery operation. When designing with this part, ensure that the MCLR pull-up and decoupling capacitors follow Microchip's recommended layout in the datasheet. Program code compatibility within the PIC16 mid-range family allows easy migration to larger or smaller pin-count variants without rewriting application firmware. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, providing an actionable reference for procurement, validation, and BOM design.

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PIC16F636-E/P - 8-bit Flash MCU, 3.5KB, 12 I/O | Microchip
PIC16F636-E/P

PIC16F636-E/P - 8-bit Flash MCU, 3.5KB, 12 I/O | Microchip

The Microchip Technology PIC16F636-E/P is a CMOS Flash-based 8-bit PIC16 family microcontroller housed in a 14-pin PDIP (300 mil) through-hole package with extended operating temperature range. It integrates 3.5KB of Flash program memory (2K x 14 words), 128 bytes of RAM, and 256 bytes of EEPROM data memory, executes instructions at 20 MHz (200 ns instruction cycle) and operates from 4.5 V to 5.5 V. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, peripherals and I/O on one die. Within the broader taxonomy, the PIC16F636 belongs to the mid-range PIC16 family of 8-bit microcontrollers (RISC architecture), which itself sits under the 8-bit MCU hierarchy (8-bit MCU -> microcontroller -> embedded processor -> semiconductor). The mid-range core delivers deterministic single-cycle instruction execution and a compact 35-instruction set, allowing engineers to maintain code portability across the PIC16F-family while adding cryptographic, analog and timing peripherals. Key features of the PIC16F636 include 12 digital I/O pins, two analog comparators with programmable on-chip reference, a KeeLoq-compatible hardware cryptographic peripheral for secure remote-keyless-entry (RKE) transmitters, a programmable Low-Voltage Detect (PLVD) module, an Enhanced Universal Synchronous/Asynchronous Receiver/Transmitter (EUSART) and a Capture/Compare/PWM (CCP) module. Internal 8 MHz and 31 kHz oscillators plus an external oscillator option give the designer flexibility between low power and accurate timing. The device supports In-Circuit Serial Programming (ICSP) for in-field firmware updates and retains MPLAB ICD debugging compatibility across the family. Typical applications include automotive RKE transmitters and tire-pressure monitor encoders, security alarm keyfobs, wireless sensor transmitters, low-cost industrial control modules, and consumer white-goods user-interface boards. Its combination of cryptographic hardware and a small 14-pin footprint makes it especially common in battery-powered remote controls where PCB real estate is at a premium and security of the rolling code is mandatory. When designing with the PIC16F636, allocate one decoupling 100 nF ceramic capacitor adjacent to each VDD/VSS pin pair, route the MCLR pin through a 10 kohm pull-up for normal operation, and observe the maximum 20 MHz clock with a 5 V supply. EEPROM endurance is 100,000 erase/write cycles typical, so use it for infrequently-updated parameters such as calibration constants or rolling-code counters rather than high-write-rate logs. This page synthesizes distributor pricing and inventory, drop-in same-package alternatives, and practical design notes that complement the manufacturer datasheet to help engineers compare the PIC16F636-E/P against pin-compatible PIC16F630/PIC16F631 family members and PIC12F/PIC10F migrators.

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PIC16F636-E/SL - 8-bit MCU, 3.5KB Flash, 20MHz, 12 I/O | Microchip
PIC16F636-E/SL

PIC16F636-E/SL - 8-bit MCU, 3.5KB Flash, 20MHz, 12 I/O | Microchip

The Microchip Technology PIC16F636-E/SL is a CMOS Flash-based 8-bit PIC16 mid-range microcontroller featuring 3.5KB (2K x 14) of program memory, 128 bytes of RAM, and 256 bytes of EEPROM, housed in a 14-pin SOIC (SL) package. It executes instructions in 200 ns at 20 MHz and operates from 2.0 V to 5.5 V across the standard commercial range, with the -E suffix indicating the -40C to +125C extended industrial temperature grade. A PIC microcontroller is a Harvard-architecture RISC MCU that fetches instructions and data on separate buses, enabling single-cycle instruction execution and deterministic timing. The PIC16F636 belongs to the mid-range PIC16 family (PIC16 -> 8-bit MCU -> microcontroller -> semiconductor) and integrates a KeeLoq-compatible hardware cryptographic module, two analog comparators, a programmable Low-Voltage Detect (PLVD), an Enhanced Universal Synchronous/Asynchronous Receiver/Transmitter (EUSART), and an 8-channel 10-bit ADC. These peripherals position it as an integrated single-chip solution for embedded control. Key features include 12 I/O pins with individually programmable pull-ups and interrupt-on-change, 35 single-word instructions, internal 8 MHz and 31 kHz oscillators selectable via configuration bits, ICD (In-Circuit Debugger) support, and Flash program memory that is endurance-rated for 100,000 erase/write cycles. The 14-bit instruction word and 8-level hardware stack simplify code development while preserving real-time responsiveness. Typical applications include automotive remote keyless entry (RKE) systems that leverage the integrated KeeLoq encoder, security and alarm panels using the comparator and PLVD blocks, industrial sensor interfaces powered by the ADC and EUSART, low-cost appliance controls, and remote-control transmitters. With its extended temperature range, the -E variant is also suited to industrial-grade environments where commercial-grade parts are insufficient. When designing with this device, allocate one I/O pin for the MCLR/VDD programming interface and reserve adequate decoupling (100 nF + 10 uF) near VDD. The Flash memory supports self-programming under firmware control, enabling bootloader-based field updates. For timing-sensitive applications, configure the internal oscillator carefully to balance accuracy against power consumption, since the 31 kHz LF source is factory-calibrated but the 8 MHz HF source allows user tuning via the OSCTUNE register. This page synthesizes distributor stock levels, AEC-Q100 automotive qualification status, pin-compatible Microchip alternates, and practical design notes that are not collated in the manufacturer datasheet.

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PIC16F636-E/ST - 8-Bit MCU, 3.5KB Flash, 20MHz, 14-TSSOP | Microchip
PIC16F636-E/ST

PIC16F636-E/ST - 8-Bit MCU, 3.5KB Flash, 20MHz, 14-TSSOP | Microchip

The Microchip Technology PIC16F636-E/ST is an 8-bit Flash-based CMOS microcontroller in a 14-pin TSSOP package, built on Microchip's powerful PIC® MCU architecture. It integrates 3.5KB (2K x 14 words) of Flash program memory, 128 bytes of RAM, and 256 bytes of EEPROM data memory, with a maximum CPU clock of 20MHz across an extended 2.0V–5.5V supply range. The "E" suffix denotes the Extended temperature grade (-40°C to +125°C), making the part suitable for industrial and harsh-environment deployments. A microcontroller (MCU) is a single-chip computer that contains a CPU, program memory, working RAM, data EEPROM, and programmable peripherals. The PIC16F636 belongs to the PIC16F mid-range 8-bit family (PIC MCU -> 8-bit microcontroller -> embedded controller -> semiconductor). Compared with 32-bit Cortex-M parts, this 8-bit MCU offers deterministic single-cycle instruction execution (except branches), an ultra-small footprint, and rock-bottom unit cost for I/O-intensive, code-size-light designs such as remote controls, sensor interfaces, and KeeLoq-compatible secure encoders. Key features include: KeeLoq® compatible hardware Cryptographic Module for secure remote-keyless-entry (RKE) applications; a Programmable Low-Voltage Detect (PLVD); two on-chip analog comparators; a 10-bit ADC-free architecture optimized for digital I/O; and 11 general-purpose I/O pins with individually selectable weak pull-ups. The device executes all 35 single-word instructions in a single instruction cycle (200 ns at 20 MHz), and supports in-circuit serial programming (ICSP) plus ICD debugging. Architecturally, the PIC16F636 uses a Harvard RISC core with separate program and data buses. The 14-bit instruction word, hardware multiplier-free design, and 8-level hardware stack simplify firmware development while reducing RAM pressure. On-chip peripherals such as timers, comparators, and the cryptographic engine are accessed via a memory-mapped SFR block, eliminating the need for external glue logic. Typical applications include remote keyless entry (RKE) transmitters, security and alarm panels, simple sensor conditioning, low-cost motor control loops, and battery-powered IoT edge nodes. Per the Microchip product page, the PIC16F636 is recommended where the cryptographic KeeLoq encoder, low power, and small pin count are valued. Design tip: place a 0.1 µF decoupling capacitor within 5 mm of the VDD pin and reserve the MCLR/VPP pin for in-circuit programming access. If migrating to a newer silicon revision, Microchip recommends the PIC16F18323 as a newer-device alternative with more peripherals. This page synthesizes distributor pricing, drop-in TSSOP-14 alternatives, and practical design notes not found in the bare datasheet.

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PIC16F636-I/ML - 8-Bit MCU, 20MHz, KeeLoq, QFN-16 | Microchip
PIC16F636-I/ML

PIC16F636-I/ML - 8-Bit MCU, 20MHz, KeeLoq, QFN-16 | Microchip

The Microchip Technology PIC16F636-I/ML is an 8-bit CMOS Flash-based microcontroller with a 20 MHz maximum clock frequency, 3.5 KB (2K x 14 words) of Flash program memory and 256 bytes of EEPROM data memory, housed in a 16-pin QFN (4x4 mm) package. An 8-bit microcontroller is an integrated circuit that combines a processor core, program memory, data memory and peripherals on a single chip, sitting at the low end of the embedded-control hierarchy within the broader microcontroller and power/system-management ecosystem. The PIC16F636 belongs to Microchip's PIC16 family of mid-range RISC MCUs, executing one instruction per cycle except for branches, with only 35 single-word instructions to learn. Key features include a KeeLoq-compatible cryptographic module for secure remote-key and authentication designs, two analog comparators, a Programmable Low-Voltage Detect (PLVD) module, and 128 bytes of SRAM. The nanoWatt technology power-management feature set supports low average current in battery-powered products. Technically, the device uses Microchip's 14-bit wide instruction word Harvard architecture with a hardware stack, and peripheral set including a 16-bit timer, an 8-bit timer, and serial connectivity including SPI. The 20 MHz oscillator options cover internal and external clocking modes. Typical applications are secure remote keyless entry, RF authentication fobs, small appliance control, battery-operated sensor nodes, and industrial sub-systems that benefit from the on-chip crypto engine and comparators. Designers should budget the single 128-byte SRAM bank carefully, as KeeLoq routines consume RAM, and use the PLVD module to detect brown-out conditions before the flash write voltage floor is crossed. This page adds value beyond the manufacturer datasheet by combining distributor availability signals, drop-in alternatives, comparison tables and practical design notes in one place.

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PIC16F636-I/P - 8-bit Flash MCU, 3.5KB, KeeLoq, DIP-14 | Microchip
PIC16F636-I/P

PIC16F636-I/P - 8-bit Flash MCU, 3.5KB, KeeLoq, DIP-14 | Microchip

The Microchip Technology PIC16F636-I/P is an 8-bit CMOS Flash-based microcontroller in a 14-pin PDIP package, featuring 3.5KB (2K x 14) of Flash program memory, 128 bytes of RAM, and 256 bytes of EEPROM, operating at up to 20 MHz across a 4.5V to 5.5V supply range. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path that integrates a CPU, RAM, non-volatile program memory, peripherals and I/O on one die. The PIC16F family uses Microchip's Harvard RISC architecture, sitting in the broader hierarchy of microcontroller -> embedded processor -> semiconductor IC, and is widely used in cost-sensitive embedded applications where deterministic timing and low power are priorities. Key features of this part include 12 I/O pins, two analog comparators, a programmable Low-Voltage Detect (PLVD) module, an internal 8 MHz oscillator, an ICD (In-Circuit Debug) interface, and a KeeLoq-compatible hardware Cryptographic Module for secure rolling-code applications such as remote keyless entry. The device is supported by Microchip's MPLAB X IDE, XC8 compiler, and PICkit programmers, and offers 35 single-word instructions to minimize learning curve. The PIC16F636 integrates an 8-bit ALU with a 14-bit instruction word, an instruction pipeline, hardware interrupt controller, brown-out reset, power-on reset, watchdog timer with its own on-chip RC oscillator, and on-chip EEPROM emulation-friendly Flash. The architectural simplicity and deterministic instruction timing make the device well-suited to safety-conscious and interrupt-driven designs that demand predictable response. Typical applications include remote keyless entry (RKE) transmitters, security sensors, automotive body electronics, industrial control logic, low-end appliance control, battery-powered sensor nodes, and KeeLoq-compatible encoders. The internal oscillator plus ICD reduce BOM and board area, while the KeeLoq module delivers secure rolling-code transmission in a single chip. When designing with this device, note that the 4.5V to 5.5V supply range and 20 MHz clock limit low-voltage and high-throughput use cases. For 3.3V-only systems, consider the PIC16F636-I/SL (SOIC) variant or the lower-voltage PIC16F88x family. Place a 100 nF decoupling capacitor close to VDD, and tie MCLR through a pull-up if not driven by an external reset source.

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PIC16F636-I/SL - 8-Bit MCU, 3.5KB Flash, 20MHz | Microchip
PIC16F636-I/SL

PIC16F636-I/SL - 8-Bit MCU, 3.5KB Flash, 20MHz | Microchip

The Microchip PIC16F636-I/SL is an 8-bit CMOS Flash-based microcontroller built on the PIC16 architecture, delivering 20 MHz operation with 3.5KB (2K x 14) of Flash program memory and 256 bytes of EEPROM data memory, housed in a 14-pin SOIC (SL) package. It packs 35 single-word instructions, 128 bytes of RAM, 12 I/O lines, 2 comparators, a KeeLoq-compatible Cryptographic Module, and Programmable Low-Voltage Detect (PLVD) into one of the densest mid-range 14-pin PIC designs available. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die. The PIC16F636 belongs to the broad PIC family -> mid-range 8-bit MCU category -> CMOS Flash-based MCU, distinguished from MIPS-, ARM-, or RISC-V-based MCUs by its Harvard RISC architecture and 14-bit instruction word. Its place in the system hierarchy is typically as the brain of small embedded control loops where deterministic instruction timing and low current draw (NanoWatt technology) matter more than raw CPU throughput. Key features include a 13-bit program counter capable of addressing 8K x 14 program space, DC-20 MHz clock speed (200 ns instruction cycle), 5 wake-up sources from Sleep, and an integrated KeeLoq-compatible Cryptographic Module for secure remote-keyless-entry applications. The 2 on-chip comparators with programmable hysteresis and dedicated reference simplify analog front-ends without external op-amps. Programmable code protection and ICD/debug support make it friendly for both secure production deployment and bench development. The PIC16F636 uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand read in a single cycle except for branches. Its NanoWatt technology yields sub-µA Sleep current with multiple wake-up options (interrupt-on-change, comparators, timers, watchdog), suited to battery-powered duty-cycled applications. Internal RC oscillator options (8 MHz, 32 kHz, 31 kHz LF) reduce BOM cost and board area by eliminating external crystals in non-precision timing designs. Typical applications include remote keyless entry (RKE) transmitters, security alarm panels, smoke and CO detectors, automotive body controllers, low-end remote sensors, and small appliance controls. The integrated KeeLoq cipher suits rolling-code secure wireless links where a discrete cryptographic IC would inflate BOM cost and PCB area. When designing with this part, verify the package derating at high temperatures and confirm that the chosen debugger (ICD3, PICkit 3/4, MPLAB Snap) header layout matches the MCLR/PGD/PGC pin assignments. The /SL suffix indicates industrial temperature grade (-40C to +85C) and SOIC-14 tube packaging. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found on any single manufacturer or distributor page.

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PIC16F636-I/ST - 8-bit MCU, 3.5KB Flash, 20MHz | Microchip
PIC16F636-I/ST

PIC16F636-I/ST - 8-bit MCU, 3.5KB Flash, 20MHz | Microchip

The Microchip Technology PIC16F636-I/ST is an 8-bit Flash-based CMOS microcontroller from the PIC16F636/639 family, featuring 3.5KB of Flash program memory, 128 bytes of RAM, and 256 bytes of EEPROM data memory in a 14-pin TSSOP (ST) package. It operates at up to 20MHz delivering 5 MIPS of throughput from a 4.5V to 5.5V supply, with 12 I/O pins and on-chip peripherals including a KeeLoq-compatible cryptographic module, a Programmable Low-Voltage Detect (PLVD) module, and two analog comparators. An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that integrates a CPU, program memory, RAM, peripherals and I/O in a single package. The PIC mid-range architecture places the PIC16F636 inside the broader hierarchy: 8-bit microcontroller -> RISC microcontroller -> microcontroller -> embedded IC -> semiconductor device. Microchip's PIC mid-range family is widely adopted in low-power, cost-sensitive embedded designs because of its compact instruction set (35 single-word instructions), deterministic interrupt latency and an 8-level deep hardware stack. Key features include a factory-calibrated internal oscillator accurate to ±1%, a flash endurance of 100K cycles, and an operating temperature range of -40C to +85C for the industrial -I grade. The device supports in-circuit serial programming (ICSP) and in-circuit debugging, simplifying firmware bring-up. An integrated 256-byte EEPROM provides non-volatile data storage for calibration constants, security keys and rolling-code parameters without external memory, which is critical for KeeLoq-compatible remote-keyless-entry (RKE) and secure-access designs. The PIC16F636 uses Microchip's Harvard RISC architecture with a 14-bit wide instruction word and separate data paths for program and data memory, enabling single-cycle instruction execution except for branches. Its 5 MIPS performance is more than sufficient for timing-sensitive control loops and basic state-machine firmware. Two comparators with programmable on-chip references simplify analog front-ends such as battery voltage and current sensing. Typical applications include remote-keyless-entry (RKE) transmitters, secure-access key fobs, low-end security sensors, simple motor control, and battery-powered appliance control where small footprint, on-chip EEPROM and KeeLoq security provide decisive BOM savings. Designers value the part for sub-1 mA active current and long-life battery budgets. When designing with this part, mind the 14-pin TSSOP package thermal envelope in high-ambient enclosures and ensure the ICSP/ICD pins (RB6/RB7) are accessible for production programming. Pin assignments of the 14-TSSOP package must be verified against the device pinout table before PCB layout.

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PIC16F639-E/P - 8-bit MCU, 3.5KB Flash, KeeLoq Crypto | Microchip
PIC16F639-E/P

PIC16F639-E/P - 8-bit MCU, 3.5KB Flash, KeeLoq Crypto | Microchip

The Microchip Technology PIC16F639-E/P is a 20 MHz 8-bit CMOS Flash microcontroller with 3.5 KB (2K x 14) program memory, 128 bytes of RAM, and 256 bytes of EEPROM, housed in a 20-pin PDIP (0.300 inch, 7.62 mm) through-hole package. The -E suffix denotes the Extended temperature grade of -40C to +125C. The device integrates Microchip's PIC16 MCU core with 35 single-word instructions, two analog comparators, a programmable low-voltage detect (PLVD) block, and a KeeLoq-compatible hardware cryptographic module for secure bidirectional communications. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and configurable peripheral I/O on one die. Within the broader taxonomy, an MCU belongs to the semiconductor family, then to integrated circuits (ICs), and more specifically to microcontrollers and embedded processors. The PIC16F series sits in Microchip's mid-range 8-bit line, between the baseline PIC10/12/16 families and the high-performance PIC18/dsPIC families. The headline features of the PIC16F639-E/P include the KeeLoq-compatible encryption/decryption engine for rolling-code remote keyless entry (RKE) and passive keyless entry (PKE), a three-channel Analog Front End (AFE) for 125 kHz transponder interfacing, MPLAB ICD 2/ICD 3 in-circuit debugging support, and NanoWatt Technology power management that drops quiescent current below 1 uA in sleep. The 11 GPIO pins support digital I/O, interrupt-on-change, and weak pull-ups, and the device includes an internal 8 MHz oscillator plus configurable clock options. Internally, the PIC16F639 uses a Harvard-architecture RISC core with separate program and data buses. The 14-bit instruction word delivers deterministic single-cycle execution for most opcodes, while the cryptographic module operates as an autonomous peripheral that consumes zero CPU cycles once the key and data registers are loaded. The on-board AFE, including an ASK/FSK demodulator and RSSI measurement, eliminates the external receiver IC traditionally required for inductive proximity systems. Typical applications include automotive remote keyless entry (RKE) transmitters, passive keyless entry (PKE) immobilizers, garage-door opener keyfobs, industrial RFID readers, secure access control fobs, and tamper-detection nodes that need a hardware root of trust. The Extended temperature grade also suits under-hood automotive and outdoor industrial installations. When designing in this part, allocate a 0.1 uF decoupling capacitor within 5 mm of the VDD pin, route the resonator pins to a quiet ground island, and reserve the AFE input pins (RA4/RA5) for the LC tank network specified in the datasheet typical application. Verify in-circuit serial programming (ICSP) connections against the Microchip ICD header pinout before finalizing PCB layout, and budget for code protection fuses if the rolling-code secret will be programmed at production. This page synthesizes distributor pricing, drop-in alternatives, and application guidance derived from the Microchip PIC16F639 datasheet family - data not consolidated in any single manufacturer document.

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PIC16F639-E/SO - 8-Bit PIC MCU w/ KeeLoq, 3.5KB Flash | Microchip
PIC16F639-E/SO

PIC16F639-E/SO - 8-Bit PIC MCU w/ KeeLoq, 3.5KB Flash | Microchip

The Microchip Technology PIC16F639-E/SO is a Flash-based, 8-bit PIC microcontroller featuring an integrated KeeLoq-compatible cryptographic module, a programmable low-voltage detector (PLVD), two analog comparators, and 256 bytes of EEPROM, housed in a 20-pin SOIC (SO) package. The device operates up to 20 MHz from a 2.0V to 5.5V supply and integrates 3.5KB (2K x 14) of Flash program memory plus 128 bytes of SRAM with 11 general-purpose I/O pins. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces on one die. Within the broader taxonomy it sits under microcontroller -> microcontroller IC -> integrated circuit -> semiconductor. The PIC16F639 specifically belongs to Microchip's PIC16 mid-range family, characterized by a 14-bit instruction set and only 35 single-word instructions to learn, making it a popular low-cost general-purpose MCU. Key features of the PIC16F639-E/SO include hardware KeeLoq cipher engine for secure rolling-code remote keyless entry applications, nanoWatt technology for low-power operation with several sleep modes, an internal 8 MHz oscillator, an enhanced USART, a capture/compare/PWM module, and a synchronous serial port that can be configured as either SPI or I2C master/slave. The device also integrates a 5-channel 10-bit ADC and dual comparators with programmable references. The PIC16F639 is engineered around Microchip's mid-range PIC16 core with a RISC Harvard architecture, providing deterministic single-cycle instruction execution except for program branches. The on-chip KeeLoq cryptographic module enables secure encrypted transmissions without external crypto ICs, while the 256-byte EEPROM is sized to securely store rolling-code transmission counters and encryption keys. Typical applications include secure remote keyless entry (RKE) transmitters, automotive immobilizers, passive anti-theft systems, secure RFID transceivers, low-cost authentication tokens, and industrial secure-access controllers. The cryptographic hardware makes the part especially valuable where encrypted RF transmission is required while still keeping the BOM small. When designing with the PIC16F639-E/SO, ensure the LF/RF front-end design follows the KeeLoq reference manual for EMI and antenna tuning. The SO package requires standard 20-SOIC PCB layout with adequate decoupling on VDD and a 100 nF bypass capacitor placed within 5 mm of the supply pin. This page synthesizes distributor pricing, drop-in package-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone, optimized for engineers sourcing the PIC16F639-E/SO for secure low-power embedded designs.

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PIC16F639-E/SS - 8-bit 20MHz Flash MCU w/ KeeLoq Crypto | Microchip
PIC16F639-E/SS

PIC16F639-E/SS - 8-bit 20MHz Flash MCU w/ KeeLoq Crypto | Microchip

The Microchip Technology PIC16F639-E/SS is a Flash-based 8-bit CMOS microcontroller delivering 20 MHz CPU performance with 3.5 KB (2K x 14) of on-chip program memory and 256 bytes of RAM, integrated into a 20-pin SSOP package. The device integrates Microchip's KeeLoq-compatible cryptographic module, a Programmable Low-Voltage Detect (PLVD) block, two analog comparators, and nanoWatt power management peripherals, all in a compact surface-mount footprint. A PIC microcontroller is a Harvard-architecture, RISC-based 8-bit MCU that executes single-word instructions in a single instruction cycle (except branches), giving it deterministic throughput for embedded control tasks. PIC MCUs sit inside the broader hierarchy: microcontroller (MCU) -> embedded processor -> semiconductor IC. The PIC16F639 belongs to the PIC16 family, characterized by 14-bit instruction words, 35 single-word instructions, and on-chip Flash program memory. The 'F' suffix indicates Flash-based (reprogrammable in-circuit), and the '639 denotes a member of the LF PIC family that bundles analog peripherals with the KeeLoq security engine. Key features of the PIC16F639-E/SS include an integrated hardware KeeLoq-compatible cryptographic encoder for secure remote-keyless-entry (RKE) and rolling-code applications, a Programmable Low-Voltage Detect (PLVD) circuit, two on-chip analog comparators, an internal 8 MHz oscillator, and the nanoWatt power-management feature set with multiple sleep modes. The 11 I/O pins support digital I/O, analog comparator inputs, and peripheral functions. The device operates from 2.0 V to 3.6 V (per Microchipusa) and 4.5 V to 5.5 V (per Chipdig summary - two voltage ranges are reported by different sources; see _validation_note). Architecture-wise, the PIC16F639 employs a 14-bit instruction word with a 35-instruction RISC core, an 8-level hardware stack, and direct/indirect addressing modes. The on-chip Flash allows in-circuit serial programming (ICSP) via two pins, eliminating external programming hardware during prototyping. The KeeLoq-compatible cryptographic module performs rolling-code encoding in hardware, drastically reducing the firmware burden for secure transmitter designs. Typical applications include remote keyless entry (RKE) systems, automotive immobilizers, secure access controls, wireless security sensors, and low-power battery-operated remote controls. The 20-pin SSOP package and compact footprint also make the device suitable for small-form-factor industrial sensors and consumer electronics. Per Microchip, the -E temperature grade is the Extended (-40 C to +125 C) variant. When designing with this part, note that the PIC16F639 uses ICSP pins (RB6/RB7) which are shared with general-purpose I/O - allocate them carefully if the firmware requires in-circuit programming access. The KeeLoq-compatible encoder requires a manufacturer-specific transmission protocol and code-format configuration that must be licensed and programmed at production time. This page synthesizes distributor pricing, drop-in alternatives (same-brand PIC16F639-TI variants), and practical design notes not found in the manufacturer datasheet, helping engineers evaluate this device for secure low-power embedded designs.

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PIC16F639-I/P - 8-Bit MCU, 3.5KB Flash, KeeLoq Crypto, 20-DIP
PIC16F639-I/P

PIC16F639-I/P - 8-Bit MCU, 3.5KB Flash, KeeLoq Crypto, 20-DIP

The Microchip Technology PIC16F639-I/P is a KeeLoq-compatible 8-bit Flash microcontroller with 3.5KB (2K x 14) program memory, 128 bytes RAM, and an integrated 256-byte EEPROM data section, packaged in a 20-pin PDIP (through-hole, 0.300"/7.62mm). The device runs at 20MHz across an operating voltage range of 2.0V to 3.6V, drawing microamp-level currents in sleep thanks to Microchip's nanoWatt Technology. A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, programmable I/O peripherals, and on-board timers and communication interfaces. Within the broader taxonomy, a microcontroller is a type of integrated circuit > semiconductor device > electronic component. The PIC16F639 belongs to Microchip's PIC16 mid-range family, which sits between the PIC10/12 baseline family and the PIC18 enhanced family. Its distinguishing feature is a hardware cryptographic peripheral implementing the KeeLoq block cipher, plus two analog comparators and a Programmable Low-Voltage Detect (PLVD). Key features include 12 digital I/O pins, two comparators with programmable reference, hardware KEELOQ encoder, three timers (Timer0, Timer1, Timer2), an Enhanced Universal Synchronous/Asynchronous Receiver/Transmitter (EUSART), an MSSP module supporting SPI and I2C (master/slave), and nanoWatt power management with multiple idle/sleep modes. The device supports in-circuit serial programming (ICSP) and in-circuit debugging via two I/O lines. The PIC16F639 is built on a CMOS process with a 14-bit instruction word and a RISC-based 35-instruction core. The Harvard architecture separates program (Flash) and data (RAM) buses, enabling single-cycle instruction fetch except for branches. The cryptographic engine executes the KeeLoq rolling-code algorithm in hardware to offload secure remote-keyless-entry transmitters and similar hopping-code systems, freeing the CPU for housekeeping tasks. Typical applications include automotive remote keyless entry (RKE) transmitters, garage-door openers, secure access control fobs, wireless security sensors, and industrial remote-control units. The integrated crypto peripheral makes it a natural fit where anti-scan and anti-playback protection is required on a 3V coin-cell budget. When designing with the PIC16F639, note that the device is optimized for 3V (3.6V max) operation; 5V-tolerant designs should select a PIC16F88x or PIC16F1xxx counterpart. Decouple VDD with a 100nF ceramic capacitor placed within 5mm of the supply pin, and use the internal 4MHz or 31kHz LFINTOSC to minimize external component count. This page synthesizes distributor stock and pricing, parametric drop-in alternatives, and practical design notes that are not aggregated in the manufacturer datasheet alone, supporting faster sourcing and BOM decisions.

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PIC16F639-I/SS - 8-Bit 20MHz MCU w/ KeeLoq Crypto | Microchip
PIC16F639-I/SS

PIC16F639-I/SS - 8-Bit 20MHz MCU w/ KeeLoq Crypto | Microchip

The Microchip Technology PIC16F639-I/SS is a flash-based 8-bit CMOS PIC microcontroller with integrated KeeLoq-compatible cryptographic hardware, two analog comparators, a programmable Low-Voltage Detect (PLVD) module, and 3.5KB (2K x 14) of self-programmable Flash program memory, housed in a 20-pin SSOP package. It executes instructions at 20MHz, supports 2V to 5.5V operation, and is targeted at secure remote-keyless entry, RFID, and access-control applications where on-chip hardware encryption reduces BOM cost and firmware complexity. A microcontroller (MCU) is a single-chip computer containing a CPU, RAM, non-volatile program memory, and peripherals. The PIC16F639 belongs to Microchip's PIC16 mid-range family - one of the broadest 8-bit MCU architectures in the industry - with only 35 single-word instructions, a 14-bit instruction word, and a Harvard memory structure. It sits inside the larger PIC microcontroller -> 8-bit MCU -> microcontroller -> embedded processing IC -> semiconductor taxonomy. This 8-bit class is preferred for cost-sensitive, deterministic, low-power designs where 32-bit performance is unnecessary. Key features include 3.5KB Flash with self-write capability, 128 bytes SRAM, 256 bytes EEPROM, 12 I/O pins, an internal oscillator, two comparators with programmable references, a KeeLoq-compatible Cryptographic Peripheral (encryption/decryption engine), and a Programmable Low-Voltage Detect (PLVD) module. The on-chip hardware crypto accelerator lets OEMs implement rolling-code encoders/decoders for remote keyless entry (RKE) and passive anti-theft systems without external crypto ICs, reducing board area and BOM cost. Architecture-wise the device uses a RISC core with a 14-bit instruction set, an 8-level hardware stack, and direct/indirect addressing modes. The on-chip KeeLoq block performs block-cipher operations on a 64-bit plaintext with a 64-bit key using a non-linear feedback shift register; this engine is unique within the PIC16F6xx line. Power management includes nanoWatt technology with multiple sleep modes drawing nanoamp-range currents, plus a brown-out reset and PLVD to safeguard against low-battery data corruption in battery-powered remote fobs. Typical applications include remote keyless entry (RKE) transmitters and receivers, automotive immobilizers, RFID tags and readers, secure access-control keypads, anti-tamper sensors, and low-cost industrial remote-control encoders. It is also used in tire-pressure monitoring system (TPMS) sensor interface modules and secure authentication tokens. The integrated PLVD makes it well-suited for battery-voltage monitoring in 3V coin-cell powered transmitters. When designing with this part, ensure the KeeLoq security keys are stored in protected Flash regions and never exposed via debug. The internal oscillator typically provides ±1% accuracy at room temperature; for tighter RF timing budgets an external crystal is recommended on compatible package options. The PLVD threshold should be tuned to the battery chemistry (typically 2.0V-2.4V for CR2032 lithium coin cells). This page synthesizes distributor pricing, verified drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone - including KeeLoq key-management guidance and PLVD threshold tuning for coin-cell chemistries.

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PIC16F648A-E/ML - 8-Bit 20MHz MCU, 7KB Flash, 28-QFN | Microchip
PIC16F648A-E/ML

PIC16F648A-E/ML - 8-Bit 20MHz MCU, 7KB Flash, 28-QFN | Microchip

The Microchip Technology PIC16F648A-E/ML is an 8-bit flash-based CMOS microcontroller with a 20 MHz CPU clock, 7 KB (4K x 14) of program Flash, 256 bytes of RAM, and 256 bytes of EEPROM data memory, housed in a 28-pin QFN (6x6 mm) package with industrial-grade -40C to +125C operating range (E suffix). It features a 4 MHz internal oscillator, 16 digital I/O lines, a USART, a Capture/Compare/PWM module, two analog comparators, and a programmable voltage reference that targets analog and integrated-level embedded designs. A mid-range PIC16 microcontroller is a Harvard-architecture RISC device designed for deterministic real-time control in cost-sensitive applications. Within the broader taxonomy, this places the PIC16F648A under PIC microcontrollers -> 8-bit microcontrollers -> microcontrollers (MCU) -> embedded processors -> semiconductors. Microchip's mid-range PIC16 line is widely used as glue logic, sensor-interface, and simple-state-machine cores where 32-bit Cortex-M parts are over-spec, and it remains a workhorse for industrial, appliance, automotive aftermarket, and consumer products. Key features include 200 ns single-cycle instruction execution, 35 single-word instructions, only 14-bit wide opcode, an integrated nanoWatt power-management block for sleep/Idle modes, in-circuit serial programming (ICSP), and 100,000 erase/write cycle Flash endurance. The on-chip USART supports RS-232/RS-485 links without an external transceiver on short runs, while the two analog comparators with programmable reference eliminate external op-amps in sensor-conditioning front ends. The PIC16F648A uses a 14-bit instruction word with separate code and data buses, a hardware multiplier is absent, and arithmetic is performed by ADD/SUB and bit-rotation primitives - typical of the mid-range PIC family. The Harvard split between 14-bit instruction memory and 8-bit data memory delivers single-cycle instruction fetch, which is why mid-range PIC16 parts reach deterministic 200 ns instruction times at 20 MHz. The internal 4 MHz oscillator is factory-calibrated to within +/-1% and can be switched under firmware control, allowing the same firmware image to service crystal, resonator, and RC clock topologies without rework. Typical applications include appliance control boards, sensor-interface front ends, low-end RS-485 sensor nodes, automotive aftermarket modules, lighting controllers, and battery-powered instrumentation where the nanoWatt sleep modes extend operating life. The integrated analog comparators make the device especially attractive for battery monitoring, thermistor front ends, and zero-cross detection on mains-coupled inputs. When designing with this part, allocate at least one digital I/O pin for ICSP and reserve the RA7/OSC1 and RA6/OSC2 pins for either crystal or external clock, even if the internal 4 MHz oscillator is the default boot source. Brown-out reset (BOR) and watchdog timer (WDT) should both be enabled in safety-relevant firmware. Decouple VDD with a 100 nF ceramic within 5 mm of the pin and add a bulk 10 uF near the regulator output to keep the analog comparators free of digital switching transients. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single, citable reference for PIC16F648A-E/ML sourcing, selection, and PCB design-in decisions.

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PIC16F648A-E/SO - 8-bit 20MHz 7KB Flash MCU | Microchip
PIC16F648A-E/SO

PIC16F648A-E/SO - 8-bit 20MHz 7KB Flash MCU | Microchip

The Microchip PIC16F648A-E/SO is an 8-bit CMOS RISC Flash microcontroller with 20 MHz maximum clock speed, 7 KB (4K x 14) Flash program memory, 256 bytes RAM and 256 bytes EEPROM data memory, housed in an 18-pin SOIC (SO) package. It features 16 I/O pins, an integrated 4 MHz internal oscillator, a USART, a capture/compare/PWM module, two analog comparators, and a programmable voltage reference. An 8-bit microcontroller (MCU) is a compact single-chip computer that integrates a CPU, program memory, RAM, peripherals, and I/O on one die. Microchip's PIC16 family uses a RISC-based Harvard architecture with only 35 single-word instructions, which simplifies firmware development and accelerates time-to-market for embedded designs. Within the broader hierarchy, the PIC16F648A is a mid-range 8-bit MCU positioned between base-line PIC10/12/16 devices and enhanced PIC18 8-bit families, well suited to cost-sensitive mixed-signal and control applications. Key features include 200 ns instruction execution time, 10-bit ADC with 8 channels, two 8-bit timers plus one 16-bit timer, an internal 4 MHz oscillator, an analog comparator module with programmable reference, and nanoWatt technology for low-power sleep modes. The device supports 4.5 V to 5.5 V supply operation with industrial-grade -40 °C to +125 °C extended temperature range (denoted by the "E" suffix), making it appropriate for harsh-environment designs. The PIC16F648A is upwards code-compatible with the PIC16F628, PIC16C62XA, PIC16C5X and PIC12CXXX devices, simplifying firmware reuse and migration. Per the Microchip product page, its combination of internal oscillator, USART, CCP and analog peripherals targets mixed-signal applications where multiple discrete ICs would otherwise be required. Typical applications include automotive body and lighting controllers, industrial sensor interfaces, appliance control boards, security and access systems, and consumer electronics such as battery chargers and small appliances. The internal oscillator eliminates an external crystal in many designs, reducing BOM cost. When designing with the PIC16F648A-E/SO, note that the "E" suffix denotes the extended temperature grade (-40 °C to +125 °C). For lower-cost commercial-grade designs operating 0 °C to +70 °C or industrial-grade -40 °C to +85 °C, select the PIC16F648A-I/SO variant with identical pinout. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers select and source the PIC16F648A-E/SO with confidence.

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PIC16F648A-E/SS - 8-Bit 20MHz MCU 7KB Flash SSOP-20 | Microchip
PIC16F648A-E/SS

PIC16F648A-E/SS - 8-Bit 20MHz MCU 7KB Flash SSOP-20 | Microchip

The Microchip PIC16F648A-E/SS is an 8-bit CMOS Flash-based microcontroller from the PIC16 family with 7KB (4K x 14) of program memory, 20MHz maximum clock speed, and a 20-pin SSOP package. It integrates 256 bytes of EEPROM data memory, 256 bytes of RAM, and a rich set of peripherals including a USART, one capture/compare/PWM (CCP) module, two analog comparators, and a programmable voltage reference - all inside a 20-pin SSOP footprint. An 8-bit microcontroller is a small, self-contained computing element that integrates a CPU, non-volatile program memory, working RAM, and I/O peripherals on a single silicon die; it sits within the broader category of microcontrollers (MCU), which in turn belongs to embedded processors and digital semiconductors. The PIC architecture uses a Harvard RISC core with only 35 single-word instructions and 200 ns instruction execution at 20 MHz, which simplifies firmware development while delivering deterministic timing for embedded control loops. Key features include an internal 4 MHz oscillator that allows the MCU to operate without an external crystal, a wide 2.0V-5.5V supply range with nanoWatt power management for sleep currents under 1 uA typical, an active-high MCLR reset, and in-circuit serial programming (ICSP) via two pins. The device supports up to 16 digital I/O lines depending on package, 10-bit ADC alternatives from the family, and brown-out reset plus power-on reset for reliable start-up. The PIC16F648A is built on Microchip's enhanced mid-range 14-bit instruction set, is upwards compatible with the PIC16F628, PIC16C62XA, PIC16C5X, and PIC12CXXX devices, and uses self-programmable Flash memory for field updates. Its analog resources - two comparators plus a programmable voltage reference - make it equally comfortable in digital glue logic or mixed-signal front-end roles. Typical applications include automotive body and interior modules, white goods and appliance control, industrial sensor conditioning, security and access peripherals, and general-purpose remote-control or sensor nodes where a small, low-power MCU with on-chip EEPROM and analog is required. Designers choose this part when the application needs more analog capability than a basic PIC16F627/628, but does not require the larger memories of PIC18 devices. When laying out a board, place a 100 nF decoupling capacitor as close as possible to VDD, keep the ICSP lines isolated from high-current traces, and respect the MCLR pull-up design rule for reliable in-system programming. For battery-backed designs, switch to the 4 MHz internal oscillator and use Sleep mode with nanoWatt features to drop average current well below 1 mA. This page consolidates distributor pricing as of 2026-09-21, drop-in pin-compatible alternatives from Microchip and competitor makers, and design notes drawn from Microchip application literature that are not aggregated on a single distributor page.

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PIC16F648A-I/ML - 8-Bit 20MHz MCU 7KB Flash 28-QFN | Microchip
PIC16F648A-I/ML

PIC16F648A-I/ML - 8-Bit 20MHz MCU 7KB Flash 28-QFN | Microchip

The Microchip Technology PIC16F648A-I/ML is a PIC16F-series 8-bit Flash CMOS microcontroller built around an enhanced mid-range PIC core that executes one instruction every 200 ns (5 MIPS at 20 MHz). It integrates 7 KB (4K x 14) of self-programmable Flash program memory, 256 bytes of EEPROM data memory and 256 bytes of SRAM, packaged in a 28-lead QFN (6 x 6 mm, ML suffix). A microcontroller (MCU) is a single-chip computer that combines a CPU, non-volatile program memory, working RAM, and a rich set of on-chip peripherals. Within Microchip's taxonomy, the PIC16F648A belongs to the enhanced mid-range PIC16F family, which sits between the baseline PIC10/12/16/17 families and the high-performance PIC18/dsPIC33 families. It is widely used for cost-sensitive 8-bit embedded control. Key features include an internal 4 MHz precision oscillator (selectable to 32 kHz LF mode), a 10-bit ADC with 8 channels, two analog comparators with a programmable voltage reference, one Capture/Compare/PWM (CCP) module, a USART for asynchronous or synchronous serial communication, and a nanoWatt power-management set with multiple sleep/idle modes. The device operates from 2.0 V to 5.5 V across -40 C to +85 C industrial temperatures. The architecture uses a 14-bit instruction word and a 16-level hardware stack, retaining the 35-instruction PIC16 instruction set for source compatibility with the legacy PIC16F628, PIC16C62XA, PIC16C5X and PIC12CXXX devices. The integrated brown-out reset (BOR), power-on reset (POR), watchdog timer and programmable code protection simplify safety and reliability design. Typical applications include remote controls, sensor signal conditioning, automotive body and interior subsystems, white goods and small appliances, and battery-powered or hand-held instruments where low-power nanoWatt operation, integrated analog and a small QFN footprint reduce the bill of materials. The newer Microchip PIC16F18444 is recommended for new designs. When designing with the PIC16F648A-I/ML, place a 100 nF decoupling capacitor close to VDD and add a bulk capacitor on the MCLR/VDD rail. Leave the ICSP/ICD pins (RB6, RB7) accessible for in-circuit debugging if firmware development is planned. This page synthesises distributor pricing, verified drop-in alternatives within the PIC16 family, and practical design notes not consolidated on the manufacturer product page, helping engineers shorten selection and qualification time.

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