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PIC16F917-I/PT - 8-Bit 20MHz MCU 14KB Flash LCD 44-TQFP
PIC16F917-I/PT

PIC16F917-I/PT - 8-Bit 20MHz MCU 14KB Flash LCD 44-TQFP

The Microchip Technology PIC16F917-I/PT is an 8-bit CMOS flash-based microcontroller from the PIC16F91X family, featuring an integrated LCD driver and nanoWatt Technology for ultra-low-power operation. It delivers 20 MHz instruction execution (200 ns instruction cycle) with up to 14 KB of flash program memory (8K x 14 words), 352 bytes of RAM, and 256 bytes of EEPROM, all housed in a 44-pin TQFP (10x10 mm) package with 35 I/O pins and one input-only pin (36 total). The device operates from 2.0 V to 5.5 V and includes an internal 32 kHz to 8 MHz oscillator with software-selectable frequency options. An 8-bit PIC microcontroller (MCU) is a RISC-based, single-chip computer built on a Harvard architecture that separates program and data memory paths, allowing simultaneous fetch and access for higher throughput at lower clock rates. PIC microcontrollers sit within the broader 8-bit MCU category, which is positioned below 16-bit and 32-bit MCUs in compute power but excels in deterministic real-time control, ultra-low power consumption, and cost-sensitive embedded applications. The LCD driver integrated into the PIC16F917 supports up to 96 segments, eliminating the need for an external LCD controller in user-interface designs. Key differentiating features include a 25 mA source/sink I/O capability for direct LED drive, two 8-bit timers (TMR0, TMR2), one 16-bit timer (TMR1), an Enhanced Watchdog Timer (EWDT), and Brown-Out Reset (BOR) with software control. The nanoWatt Technology offers multiple power-managed modes (Run, Idle, Sleep) to extend battery life in portable instruments. A 10-bit Analog-to-Digital Converter (ADC) with up to 14 channels supports mixed-signal sensing applications. The PIC16F917 utilizes Microchip's enhanced mid-range core with 35 single-word instructions, an 8-level hardware stack, and direct/indirect addressing modes. Its integrated LCD driver supports static, 1/2, 1/3, and 1/4 multiplexed LCDs with variable bias, simplifying glass-panel integration. The internal oscillator is factory-calibrated to ±1% accuracy, reducing external component count. Typical applications include consumer appliances (washing machines, microwave ovens, thermostats) requiring LCD user interfaces, industrial control panels with segmented displays, medical instruments (blood pressure monitors, glucose meters), automotive instrument clusters (non-safety-critical segments), metering equipment with LCD readouts, and battery-powered handheld devices. The wide 2.0 V to 5.5 V operating range supports both 3.3 V and 5 V designs. When designing with this part, ensure that the internal oscillator configuration matches the application's timing accuracy requirement. Decoupling capacitors (100 nF ceramic) should be placed within 3 mm of VDD, and the MCLR pin should be pulled high through a 10 kΩ resistor for normal operation. Programming/debug is supported via ICSP (In-Circuit Serial Programming) using the PGD/PGC pins, compatible with PICkit 3, MPLAB ICD 3, and MPLAB REAL ICE tools. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone. Where datasheet values were unavailable, [DATA_NEEDED] markers flag parameters requiring verification against the latest Microchip revision.

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PIC16F917T-I/PT - 8-Bit MCU, 14KB Flash, 36 I/O, TQFP-44 | Microchip
PIC16F917T-I/PT

PIC16F917T-I/PT - 8-Bit MCU, 14KB Flash, 36 I/O, TQFP-44 | Microchip

The Microchip PIC16F917T-I/PT is an 8-bit PIC16 family flash microcontroller with 14KB (8K x 14) program memory, 352 bytes of RAM, and a 44-pin TQFP (10x10 mm) package, operating up to 20 MHz from a 2.0V to 5.5V supply. According to the Microchip PIC16F91X datasheet (DS39630E), the device integrates an integrated LCD driver with up to 36 segment outputs, an internal oscillator, a 14-channel 8-bit ADC, nanoWatt power management, and up to 36 digital I/O pins. An 8-bit flash microcontroller (MCU) is a single-chip computer that combines a CPU, non-volatile program memory, RAM, and peripherals on one die. The PIC16F917 sits in the broader hierarchy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. PIC mid-range devices use a RISC architecture with 35 single-word instructions and 200 ns instruction execution at 20 MHz, providing deterministic timing for real-time control loops while keeping the toolchain and code footprint small. Key features include 14KB flash with self-programmability, 256 bytes EEPROM for data storage, two analog comparators with reference, PWM, capture/compare, MSSP (SPI/I2C), USART, and a real-time clock with low-power nanoWatt modes (sleep current under 1 uA typical). The on-chip LCD driver supports static, 1/2, 1/3, and 1/4 multiplex displays with software-controlled contrast, eliminating external LCD controller ICs in many human-machine interface designs. Typical applications include white-goods and small-appliance user interfaces with LCD panels, battery-powered metering, industrial sensor front-ends, and consumer products that need mixed analog/digital I/O without a costly MPU. The wide 2.0-5.5V range simplifies single-cell Li-ion or multi-cell alkaline designs. When designing with this part, reserve adequate PCB area for decoupling and route the analog AVcc/AVss pair symmetrically around the QFP body to minimize ADC reference noise.

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PIC16F946-I/PT - 20MHz 8-Bit Flash MCU | Microchip Technology
PIC16F946-I/PT

PIC16F946-I/PT - 20MHz 8-Bit Flash MCU | Microchip Technology

The Microchip Technology PIC16F946-I/PT is an 8-bit flash-based PIC microcontroller with a 20 MHz maximum operating frequency, 14 KB of programmable flash organized as 8K x 14 words, and a 64-pin TQFP package measuring 10 mm x 10 mm. The device combines a compact RISC architecture with LCD-driver capability, flexible timers, an extended watchdog timer, and nanoWatt power-management features. A microcontroller is a programmable semiconductor that integrates a processor core, memory, and peripherals into one package. The PIC16F946 belongs to the PIC16 family of 8-bit CMOS microcontrollers, a category commonly used for embedded control, human-interface, instrumentation, and low-to-medium-speed automation systems. Its dedicated LCD-driver outputs reduce external display-controller requirements in applications using segmented or dot-matrix LCDs. The PIC16F946-I/PT provides up to 168 LCD segments, an internal oscillator spanning 32 kHz to 8 MHz, and two 8-bit timers plus one 16-bit timer. The extended watchdog timer supports reliable recovery from unexpected program flow, while brown-out reset provides controlled startup when the supply voltage falls below its operating threshold. A 64-pin TQFP package provides broad I/O availability while supporting a 2.0 V to 5.5 V operating-voltage range. According to the Microchip PIC16F946 manufacturer datasheet 41265A, the controller uses a Harvard-style architecture with flash program memory and data memory, executes its instruction set in as little as 200 ns, and includes an instruction set described as 35 single-word instructions. In-Circuit Serial Programming allows firmware programming and debugging without removing the device from its circuit, accelerating prototype bring-up and production programming. Typical uses include digital panel meters, industrial measurement equipment, environmental monitors, pump and valve controllers, and compact consumer appliances. Its LCD driver is particularly useful in human-interface equipment requiring multiple alphanumeric or graphical indicators. The internal oscillator also allows designs to start without a separate crystal when precision beyond the internal clock range is unnecessary. Designers should verify the LCD segment mapping, oscillator tolerances, and timing requirements in the manufacturer datasheet before layout release. Place decoupling capacitors close to the supply pins, reserve a programming interface for In-Circuit Serial Programming, and confirm that the selected crystal or external clock remains compatible with the intended operating frequency. This product page combines device specifications, qualified replacement guidance, comparison parameters, and practical implementation notes to support faster component selection and PCB planning.

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PIC16HV540-04/P - 8-Bit 4MHz OTP MCU 768B EPROM 18-PDIP | Microchip
PIC16HV540-04/P

PIC16HV540-04/P - 8-Bit 4MHz OTP MCU 768B EPROM 18-PDIP | Microchip

The Microchip Technology PIC16HV540-04/P is an 8-bit CMOS RISC microcontroller built on the legacy PIC16C5x core, integrating a 768-byte (512 x 12) one-time-programmable EPROM program memory, 25 bytes of RAM, and an on-chip shunt voltage regulator that accepts a wide 3.5 V to 15 V supply range. Operating at up to 4 MHz (200 ns instruction cycle), it offers 12 digital I/O lines and executes one instruction per cycle using only 33 single-word opcodes, delivering the characteristic 2:1 code compression over other 8-bit MCUs in its class. It comes in a through-hole 18-pin PDIP package and is currently in production per Microchip's product page. An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, integrating a CPU, program memory, data RAM, and peripherals. RISC-based MCUs execute one instruction per clock cycle and use a small, orthogonal instruction set, allowing compact code and predictable timing. Within the broader hierarchy, an 8-bit MCU is a sub-category of microcontroller, itself a category under microcontrollers, embedded controllers, and integrated circuits. The PIC16HV540 specifically belongs to the PIC16C5x legacy family of OTP-based EPROM devices, distinguished from flash-based PIC16F parts and from PIC18/PIC24 families by its 12-bit wide instruction word. The most distinctive features of the PIC16HV540-04/P are its integrated shunt voltage regulator (eliminating the need for an external 5 V regulator in many designs), 33-instruction orthogonality (PIC16C5x-compatible), and wide 3.5 V-15 V supply tolerance. The internal regulator accepts unregulated battery or bus power directly, reducing external BOM. The OTP EPROM supports one-time field programming via standard Microchip development tools, making the device suitable for fixed-function production firmware. Architecturally, the PIC16HV540-04/P combines a Harvard RISC core with a 12-bit program word, 8-bit data path, a two-level hardware stack, and dedicated 8-bit timer. Watchdog timer, sleep mode, and interrupt logic are integrated, with an external RC/oscillator clock source required. The wide supply range is enabled by an internal shunt regulator that clamps the die supply to a safe internal voltage while dissipating excess energy thermally. Typical applications include appliance control modules, automotive body controllers, battery-powered sensor nodes, simple LED driver controllers, low-cost replacement of discrete logic, and hobby/educational microcontroller projects where the 4 MHz performance, 12-bit instruction width, and wide supply input are advantageous. Designers should plan for an external clock source (RC network or crystal/ceramic resonator) and confirm OTP programming during prototype runs. Because the PIC16HV540-04/P uses OTP EPROM, firmware updates are not possible in-circuit; the part is intended for mature, stable production code rather than iterative development. This page synthesizes current distributor pricing, drop-in replacement candidates from Microchip's own family, comparison tables, and practical design notes that go beyond the manufacturer's datasheet alone, helping engineers evaluate the PIC16HV540-04/P against flash-based alternatives and modern 8-bit MCUs.

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PIC16HV540-04/SO - 4MHz 8-Bit OTP MCU w/ Voltage Regulator | Microchip
PIC16HV540-04/SO

PIC16HV540-04/SO - 4MHz 8-Bit OTP MCU w/ Voltage Regulator | Microchip

The Microchip Technology PIC16HV540-04/SO is an 8-bit CMOS RISC microcontroller with an integrated on-chip shunt voltage regulator, 4 MHz maximum clock speed, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 bytes of RAM, housed in an 18-pin SOIC (SO) package. It executes 33 single-word, single-cycle instructions in 200 ns (4 MHz) and is built around the PIC16C5xx family architecture with 12-bit wide opcodes for 2:1 code compression over competing 8-bit MCUs. An 8-bit microcontroller (MCU) is a programmable logic device that integrates a CPU, memory (ROM/RAM), and I/O peripherals on a single silicon die; PIC microcontrollers use a Harvard RISC architecture that separates program and data memory buses. The PIC16HV540 specifically belongs to the enhanced PIC16C54 family - the smallest, lowest-cost PIC line intended for high-volume embedded control. Its on-chip shunt regulator allows direct operation from an unregulated DC source (typical industrial 5V, 9V, or 12V rails) without an external 7805-style LDO, simplifying BOM in cost-sensitive designs. Key features include 12 digital I/O pins, a programmable watchdog timer, an 8-bit timer/counter, internal RC oscillator, power-on reset, brown-out detection support, and an operating voltage range of 3.5V to 15V enabled by the integrated voltage regulator. The HV (high-voltage) suffix denotes the on-chip regulator, which is the key differentiator from the non-HV PIC16C540. The 18-pin SOIC provides a compact surface-mount footprint for moderate-density designs. Architecturally, the device uses a 12-bit instruction word with single-cycle execution except for branch instructions (2 cycles). The OTP program memory is one-time programmable - suitable for production but not for prototyping iteration. The integrated voltage regulator supports both 5V and 9V/12V system rails with minimal external components. Typical applications include appliance control, sensor signal conditioning, battery chargers, smart lighting, automotive accessories, and any cost-driven embedded product requiring 8-bit processing with a wide Vin tolerance. The wide voltage range (3.5V to 15V) makes it suitable for industrial 12V systems, automotive 12V buses, and unregulated AC-derived DC rails. When designing with this part, note that OTP precludes firmware updates; for prototyping use a windowed (JW) or Flash-based alternative. The on-chip voltage regulator requires an external shunt resistor and bulk capacitance sized per the datasheet regulator topology section. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16HV540-04/SS - 4MHz 8-Bit MCU with Shunt Vreg | Microchip
PIC16HV540-04/SS

PIC16HV540-04/SS - 4MHz 8-Bit MCU with Shunt Vreg | Microchip

The Microchip Technology PIC16HV540-04/SS is a RISC-based 8-bit CMOS microcontroller featuring an integrated shunt voltage regulator, 512 words of 12-bit-wide EPROM program memory and 25 bytes of RAM, all packaged in a 20-pin SSOP. Operating from 3.5V to 15V supply and clocked at 4 MHz, it executes 33 single-word instructions in a highly orthogonal 12-bit instruction set that delivers roughly 2:1 code compression over competing 8-bit MCUs. The on-chip shunt regulator eliminates an external 78L05-style regulator in cost-sensitive and battery-powered designs, allowing direct connection to loosely regulated rails. A microcontroller (MCU) is an integrated circuit containing a CPU core, program memory, RAM, and programmable I/O peripherals on a single die. Within the MCU taxonomy the PIC16HV540 sits in the 8-bit PIC16 baseline/mid-range family (hypernyms: PIC16 -> baseline PIC -> 8-bit microcontroller -> microcontroller -> semiconductor). The PIC16C5x instruction set - the direct predecessor to the PIC16HV540 - is widely regarded as the simplest industrial MCU ISA, which keeps assembly-language learning curves short and code density high. Key specifications include 12 I/O pins, an internal RC or external clock option, a 4 MHz maximum oscillator frequency, and a 1.5 ms power-on reset. The internal shunt regulator (commonly referred to as the 'HV' or high-voltage block) draws its bias current directly from the supply pin and clamps VDD to a regulated 5 V nominal regardless of VIN in the 3.5 V to 15 V range - though operationally the part is specified for supply voltages 3.5 V to 15 V with full-speed performance. Typical applications span remote keyless-entry fobs, low-end IR/RF remote controls, simple sensor signal conditioning, and appliance timer controllers. The integrated regulator, low pin count, and OTP program memory make the PIC16HV540 attractive for sealed, low-cost, replaceable consumer products where software is factory-customized and field updates are not required. When designing with this part, evaluate whether OTP or windowed EPROM matches your production flow. Plan for a 25-byte RAM ceiling and a single 8-bit timer - sufficient for blink-and-beep logic but tight for any protocol stack. For designs needing flash re-programmability, drop-in PIC16F alternatives exist in the same SSOP-20 footprint.

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PIC16HV540-04I/P - 8-Bit 4MHz OTP MCU w/ HV Reset | Microchip
PIC16HV540-04I/P

PIC16HV540-04I/P - 8-Bit 4MHz OTP MCU w/ HV Reset | Microchip

The Microchip Technology PIC16HV540-04I/P is a PIC16 family 8-bit CMOS one-time-programmable (OTP) microcontroller with an integrated high-voltage (HV) reset generator, delivered in an 18-pin PDIP through-hole package and rated for the industrial temperature range (-40C to +85C). It executes instructions in 200 ns at 4 MHz, provides 768 bytes (512 x 12) of OTP program memory, 25 bytes of data RAM, and 12 bidirectional I/O pins. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals. The PIC16HV540 belongs to the RISC (Reduced Instruction Set Computer) subfamily of 8-bit microcontrollers, sitting beneath the broader category of embedded controllers and above general-purpose microprocessors in the computing hierarchy. Its 12-bit-wide instruction word and 33 single-word instruction set yield approximately 2:1 code compression versus competing 8-bit CISC architectures, simplifying firmware development. Key features of this -04I/P variant include a 4 MHz maximum clock, an on-chip shunt voltage regulator that allows direct operation from 5 V to 12 V supplies without an external regulator, a watchdog timer (WDT), power-on reset (POR), and brown-out detect (BOD). The /P suffix indicates a plastic PDIP-18 package; the -04 speed grade limits the oscillator to 4 MHz; the I suffix marks the industrial temperature grade. The integrated HV reset eliminates the need for an external reset supervisor, reducing BOM count in cost-sensitive designs. Typical applications include low-cost battery chargers, smoke detectors, LED controllers, simple sensor interfaces, and replacement of discrete logic in appliances and toys. The wide supply range (3.5 V to 15 V with internal regulator) suits unregulated or battery-fed systems. Designers should ensure OTP programming is performed before final PCB assembly because OTP parts cannot be re-programmed in-circuit once sealed.

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PIC16HV540-04I/SO - 4MHz 8-bit MCU w/ Voltage Regulator | Microchip
PIC16HV540-04I/SO

PIC16HV540-04I/SO - 4MHz 8-bit MCU w/ Voltage Regulator | Microchip

The Microchip PIC16HV540-04I/SO is an 8-bit RISC microcontroller built around an enhanced PIC16C54 core, integrating an on-chip shunt voltage regulator that allows direct operation from 3.5V to 15V supplies without external regulation. Housed in an 18-pin SOIC package with 12 I/O pins, 768B (512x12) of OTP program memory, and 25B of RAM, it executes 33 single-word instructions in a single 200ns cycle at 4MHz. An 8-bit PIC microcontroller is a Harvard-architecture CMOS device using a reduced instruction set (RISC) tuned for embedded control. It belongs to the broader category of microcontrollers -> microcontrollers and microprocessors -> semiconductors -> integrated circuits. The "HV" prefix in the part number denotes the integrated high-voltage shunt regulator, eliminating the need for an external 5V LDO when powered from a 9V or 12V rail - a unique feature compared with most PIC16C5x siblings. Key features include 4MHz maximum clock, 200ns instruction cycle, 12-bit wide opcodes for 2:1 code compression, 8-bit data path, 12 configurable I/O pins sharing bidirectional ports, and an industrial temperature range of -40C to +85C. The integrated voltage regulator also simplifies designs that previously required external Zener or LDO networks. The PIC16HV540 architecture pairs an EPROM-based program memory with a 7-stage instruction pipeline visible only to the developer through its single-cycle execution model. The 12-bit instruction width combined with full orthogonal addressing eliminates special-purpose accumulator constraints, making the device unusually easy to program given its 33-instruction set. Typical applications include battery chargers, automotive subsystems, industrial control logic, simple timer/counter replacements, and any embedded node previously built around discrete 555-style circuitry. The wide supply tolerance supports direct 9V or 12V battery operation. Designers should budget EPROM programming time and ensure the OTP windowless package suits their production volume - the PIC16F equivalent is recommended for prototype or low-volume runs. The PIC16HV540-04I/SO variant ships in industrial temperature grade. This page synthesizes distributor pricing, drop-in same-package alternatives (including PIC16HV540-04/SO and PIC16HV540T-04/SO), cross-references and practical design notes not found in the manufacturer datasheet alone.

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PIC16HV540-04I/SS - 8-Bit OTP MCU w/ HV Shunt Regulator | Microchip
PIC16HV540-04I/SS

PIC16HV540-04I/SS - 8-Bit OTP MCU w/ HV Shunt Regulator | Microchip

The Microchip Technology PIC16HV540-04I/SS is an 8-bit CMOS RISC microcontroller with an integrated on-chip high-voltage shunt regulator, packaged in a 20-pin SSOP. It executes 33 single-word instructions, all single-cycle (200 ns) except program branches, and integrates 768 bytes (512 x 12) of one-time programmable (OTP) EPROM program memory plus 25 bytes of general-purpose RAM. The device runs at 4 MHz from a wide 3.5 V to 15 V supply and is offered in the industrial -40C to +85C temperature range with 12 digital I/O pins. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O. Within the semiconductor hierarchy, MCUs belong to the broader category of microcontrollers -> embedded processors -> digital ICs -> semiconductors. The PIC16HV540 specifically belongs to Microchip's PIC16 family, which uses a Harvard RISC architecture with 12-bit-wide opcodes delivering 2:1 code compression over typical 8-bit CISC competitors. Its defining feature versus standard PIC16C54 parts is the on-chip shunt voltage regulator that lets the device operate directly from 5 V / 9 V / 12 V / unregulated supplies. Key features include 200 ns instruction execution (5 MHz internal throughput), 2-level hardware stack, 8-bit timer/counter with 8-bit prescaler, watchdog timer with its own on-chip RC oscillator, and programmable code protection. The integrated high-voltage shunt regulator (HV540 suffix) accepts up to 15 V at VDD and clamps it to the internal logic level, eliminating external 5 V regulators in many low-cost applications. Power-saving SLEEP mode reduces IPD to typical low-microamp levels. Architecturally, the PIC16HV540 uses a 12-bit instruction word fetched from OTP EPROM while data accesses a separate 8-bit RAM bus - a classic Harvard layout that allows instruction and data fetch in a single cycle. The on-chip voltage regulator is a parallel (shunt) topology, not a series LDO, which means the device can be powered from any DC source between 3.5 V and 15 V with appropriate series resistance to limit shunt current. Typical applications include low-cost 9 V and 12 V battery or wall-adapter powered appliances, remote controls, sensor signal conditioning, LED drivers, smoke detectors, and any embedded control node that benefits from a single-supply rail without external regulation. The PIC16HV540-04I/SS is well suited to high-volume consumer and industrial designs where its 4 MHz performance, 12-bit OTP code density, and integrated shunt regulator reduce total BOM cost. When designing with this part, calculate the external shunt resistor to limit the regulator current within the device's safe operating range at worst-case VIN. The internal pull-ups and reset circuit must be properly enabled via configuration bits; consult the datasheet's CONFIG register description. Because the device is OTP, firmware must be fully validated before programming - there is no in-system reprogramming. This page synthesizes distributor pricing, drop-in same-package alternatives, and design notes not found in any single manufacturer datasheet or distributor catalog.

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PIC16HV540-20/P - 8-Bit 20MHz OTP MCU with On-Chip Regulator | Microchip
PIC16HV540-20/P

PIC16HV540-20/P - 8-Bit 20MHz OTP MCU with On-Chip Regulator | Microchip

The Microchip Technology PIC16HV540-20/P is an 8-bit EPROM-based CMOS microcontroller with an integrated on-chip voltage regulator, available in a 18-pin PDIP through-hole package. Operating from 3.5V to 15V supply with a maximum clock rate of 20MHz, it offers 768 bytes of OTP program memory (512 x 12-bit words) and 25 bytes of RAM, with 12 digital I/O pins. A key feature is the on-chip 3V and 5V shunt regulator that eliminates the need for an external regulator when powered from unregulated 9V or 12V batteries or mains adapters, simplifying power supply design and reducing BOM cost. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data memory, and programmable I/O peripherals; the PIC16HV540 belongs to the base-level PIC16C5X-compatible 8-bit RISC microcontroller family in the broader taxonomy of microcontroller -> embedded processor -> integrated circuit -> semiconductor. The 33 single-word instruction set and 12-bit-wide orthogonal instructions deliver 2:1 code compression over competing 8-bit MCUs in the same price class. Key features include 20MHz maximum operating frequency (4MHz factory-default oscillator configuration available, hence the -20 speed suffix), 12 I/O pins with individual direction control, an 8-bit timer/counter, a watchdog timer, and power-on reset. The internal voltage regulator is the defining differentiator; it allows direct battery or transformer-rectifier connection with no external regulation stage. The device uses a Harvard-architecture RISC core with separated program and data buses, fully static operation, and a wide operating temperature range appropriate for embedded industrial and commercial environments. The OTP program memory is one-time programmable, targeting volume production where final firmware is fixed. Typical applications include 9V or 12V battery-powered appliances, mains-powered consumer products using transformer-rectifier supplies without regulation, sensor interface controllers, simple timing and sequencing logic replacements, automotive accessory modules, and low-cost industrial controllers where the on-chip regulator reduces part count and PCB area. When designing with the PIC16HV540, verify the chosen clock frequency matches the supply voltage across the full operating range; the -20 speed grade requires appropriate oscillator configuration, and the user must decide between the factory-masked oscillator and an external RC/crystal source based on timing accuracy requirements. This page consolidates pricing across multiple distributors, all five drop-in alternatives sharing the 18-PDIP footprint, and practical design notes to accelerate selection for new and existing 8-bit designs.

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PIC16HV540-20/SO - 8-Bit 20MHz OTP MCU 768B | Microchip
PIC16HV540-20/SO

PIC16HV540-20/SO - 8-Bit 20MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16HV540-20/SO is a high-performance 8-bit CMOS microcontroller with 768B (512 x 12) OTP program memory, 25B RAM, and 12 I/O pins, operating at up to 20MHz in an 18-pin SOIC package. It integrates an on-chip shunt voltage regulator that allows direct operation from supply voltages between 3.5V and 15V, eliminating the need for a separate 5V regulator in many designs. An 8-bit microcontroller (MCU) is a microprocessor optimized for embedded control, integrating CPU, RAM, non-volatile program memory, and I/O peripherals on a single die. Within the broader taxonomy, the PIC16HV540 sits in the legacy Enhanced PIC16C5x family (MCU -> 8-bit MCU -> PIC16xx family -> 16C/16HV subfamily), targeting cost-sensitive applications where simple deterministic timing and low part count outweigh the need for modern peripherals. The 12-bit wide instruction word yields 2:1 code compression over competing 8-bit architectures, and the 33-instruction RISC set delivers 200ns instruction execution at 20MHz. The PIC16HV540's distinguishing feature is the on-chip shunt voltage regulator - the "HV" in the part number. This internal regulator derives the 5V core supply directly from the high-voltage rail, so designers can connect the device to a 9V or 12V supply without an external regulator. The 12 I/O pins support direct LED drive, key-scan matrix input, and simple digital sensing. Other features include a watchdog timer, power-on reset, and an EPROM-based program memory in this OTP configuration. Typical applications span appliance controllers, automotive body electronics, security keypads, lighting ballasts, and industrial timers. The wide 3.5-15V supply range makes it well suited to 12V-bus industrial systems where a single IC must operate directly from the unregulated rail. The 18-SOIC package footprint enables compact PCB layouts in surface-mount assemblies. When designing with this part, note the OTP memory cannot be re-programmed in-circuit - use the PIC16HV540-04I/SO (industrial temperature grade) or PIC16LF versions for development. The internal shunt regulator draws bias current proportional to the input voltage - account for the additional quiescent dissipation at 15V supply.

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PIC16HV540-20/SS - 8-bit OTP MCU with Voltage Regulator | Microchip
PIC16HV540-20/SS

PIC16HV540-20/SS - 8-bit OTP MCU with Voltage Regulator | Microchip

The Microchip PIC16HV540-20/SS is an 8-bit EPROM-based CMOS microcontroller with an on-chip high-voltage shunt regulator, delivering 200 ns instruction execution at 20 MHz in a 20-pin SSOP package. It provides 768 bytes of OTP program memory (512 x 12), 25 bytes of RAM, and 12 I/O pins, with the on-chip voltage regulator enabling direct operation from supplies up to 15V without an external regulator. A microcontroller (MCU) is an integrated circuit that combines a CPU, non-volatile program memory, volatile working RAM, and peripheral I/O on a single die. Within the broader hierarchy, the PIC16HV540 belongs to the 8-bit MCU family, more specifically the PIC16 family of OTP/EPROM microcontrollers, which occupy the entry-level and cost-sensitive tier of Microchip's PIC portfolio. The 8-bit MCU category itself sits inside microcontrollers and embedded controllers, which are part of the integrated circuits and embedded systems domain. The 20 MHz oscillator and 200 ns instruction cycle deliver five million instructions per second (5 MIPS). With 12-bit wide, highly orthogonal instructions, code density is roughly 2:1 better than competing 8-bit MCUs in the same price range, simplifying firmware development and reducing memory pressure on the small 768-byte OTP program store. Twelve bidirectional I/O pins, an 8-bit timer/counter with a prescaler, watchdog timer, power-on reset, and programmable code protection round out the on-chip peripherals. The standout architectural feature is the on-chip shunt voltage regulator on the VDD pin, which permits the device to run from raw supplies up to 15V by absorbing excess voltage as heat in an external resistor. This eliminates the need for an external 5V regulator in many cost-sensitive and battery-charging applications. The CMOS process yields very low power consumption, with typical active current under 2 mA at 5V/4 MHz and standby currents in the microamp range. Typical applications include single-cell battery chargers, automotive control modules, security and access-control devices, low-cost remote controls, and white-goods control boards. Industrial uses span appliance timing, smart sensors, and simple motor control loops where the high-voltage input capability is a differentiator. The industrial -40C to +85C range option (PIC16HV540-20I/SS) extends reach to harsher environments. When designing with this part, treat the shunt regulator power dissipation as a thermal load. At 12V input delivering 5 mA to the chip, the shunt resistor dissipates approximately (12-5) x 5 mA = 35 mW - low enough for a 0805 resistor. Brown-out and watchdog configurations must be set in the configuration word at programming time; verify the configuration bits in your hex file before going to production. This page synthesizes distributor pricing, same-brand PIC16C5x drop-in alternatives, and practical thermal and EMI notes not found in the manufacturer datasheet alone.

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PIC16HV540-20I/P - 8-Bit 20MHz OTP MCU w/ Shunt Regulator | Microchip
PIC16HV540-20I/P

PIC16HV540-20I/P - 8-Bit 20MHz OTP MCU w/ Shunt Regulator | Microchip

The Microchip Technology PIC16HV540-20I/P is an 8-bit CMOS RISC microcontroller in the PIC16C family, packaged in an 18-pin PDIP (Plastic DIP) and built around an enhanced PIC16C54 core. According to the manufacturer datasheet, it integrates 768B of OTP program memory (512 x 12 words), 25 bytes of data RAM, and 12 I/O pins, and it executes at a maximum clock speed of 20 MHz. Its defining feature is an on-chip shunt voltage regulator that lets the device operate directly from a 3.5 V to 15 V supply without an external regulator IC. The -20I suffix denotes 20 MHz maximum frequency at the industrial temperature range of -40 C to +85 C. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and I/O peripherals. Within the semiconductor hierarchy, an MCU is a member of the embedded controllers / microcontrollers class, which sits under digital logic ICs and broader integrated circuits. The PIC16HV540 specifically belongs to the PIC16C mid-range family, characterized by a 12-bit instruction word, 33 single-word instructions, and a 2:1 code density advantage over competitive 8-bit MCUs. Key features include an internal oscillator option that eliminates the need for an external crystal in cost-sensitive designs, a programmable watchdog timer with its own on-chip RC oscillator, an 8-bit real-time clock/counter with 8-bit prescaler, and a power-on reset / brown-out reset combination. Code protection is provided by security bit programming, and the device supports in-circuit serial programming (ICSP) via the RB6/RB7 pins. The shunt regulator topology internally clamps VDD, simplifying power design in battery-powered and automotive-style applications. Typical applications include low-cost battery chargers, smart battery management, power supply monitoring and supervisory circuits, automotive subsystems, and any node that previously required an external regulator plus microcontroller combination. The wide 3.5 V to 15 V supply range and on-chip regulator make the part especially useful in 12 V lead-acid battery systems, two-cell lithium packs, and industrial control boards where the supply rail is unregulated. When designing with the PIC16HV540-20I/P, engineers should note that the shunt regulator diverts excess current to ground as heat; at high supply voltages (12-15 V) the shunt dissipation can reach several hundred milliwatts, so PCB copper area or thermal relief matters. The OTP memory is one-time programmable - code must be verified before production burn, and field firmware updates are not possible. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing an independent reference for sourcing and BOM decisions.

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PIC16HV540-20I/SO - 8-Bit 20MHz OTP MCU with Shunt Regulator
PIC16HV540-20I/SO

PIC16HV540-20I/SO - 8-Bit 20MHz OTP MCU with Shunt Regulator

The Microchip Technology PIC16HV540-20I/SO is an 8-bit RISC microcontroller built on the enhanced PIC16C5x core, integrating an on-chip shunt voltage regulator that allows direct operation from high-voltage supplies (5V, 9V, or 12V nominal). The device executes instructions at 20MHz, delivering a 200ns instruction cycle, and packs 768B (512 x 12) of One-Time-Programmable (OTP) program memory with 25 bytes of general-purpose RAM. It is housed in an 18-pin SOIC package and is offered in the industrial temperature grade (-40C to +85C). An 8-bit OTP microcontroller is a single-chip computer whose program memory is written once at production time using One-Time-Programmable EPROM cells, after which the bit pattern becomes permanent. This positions the MCU as a low-cost, low-pin-count cousin in the broader 8-bit PIC family -> RISC microcontroller -> embedded controller -> semiconductor hierarchy. The PIC16HV540 is engineered for cost-sensitive, fixed-function embedded tasks such as logic replacement, sensor signal conditioning, and motor timing. Key differentiating features include the integrated shunt regulator that eliminates the need for an external 5V regulator on a 9V or 12V bus, 12 bidirectional I/O pins with individually programmable direction, a hardware watchdog timer, and a programmable 8-bit prescaler shared by Timer0 and the watchdog. The architecture is based on a 12-bit-wide instruction word, achieving 2:1 code compression versus competing 8-bit MCUs in the same price class, which lowers program-memory pressure. Typical applications include logic-replacement glue on 12V industrial bus lines, automotive interior lamp and HVAC actuators (pre-CAN nodes), battery chargers for sealed lead-acid cells, capacitive-touch front-panel controllers, and dedicated sensor-interface MCUs in white goods. The on-chip shunt regulator also makes the part a strong fit for any application where the MCU must be powered directly from a high-voltage DC rail without an external LDO. When designing with this part, note that the integrated shunt regulator drops excess voltage across the device; the package must dissipate P = (VIN - 5V) x ILOAD watts, so adequate copper area is essential at high VIN. OTP devices cannot be re-programmed in-circuit - code must be finalized and burned during production programming.

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PIC16HV540-20I/SS - 20MHz 8-Bit MCU 768B OTP 20-SSOP | Microchip
PIC16HV540-20I/SS

PIC16HV540-20I/SS - 20MHz 8-Bit MCU 768B OTP 20-SSOP | Microchip

The Microchip Technology PIC16HV540-20I/SS is an enhanced PIC16C54 8-bit CMOS OTP microcontroller with an integrated high-voltage shunt regulator, packaged in a 20-pin SSOP (5.30 mm body) and rated for industrial temperature operation. It executes instructions in 200 ns (5 million instructions per second at 20 MHz oscillator) and provides 768 bytes (512 x 12) of on-chip OTP program memory, 25 bytes of general-purpose RAM, and 12 bidirectional I/O pins. The 'HV' suffix denotes an internal shunt voltage regulator that accepts a wide external supply and derives VDD on-chip from VPP - useful when a single high-voltage rail powers both logic and programming. An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path and one-time-programmable non-volatile memory that retains code without power. In the broader taxonomy, OTP microcontrollers sit beneath flash-based MCUs (re-programmable) and above mask-ROM MCUs (factory-programmed only); all three belong to the embedded controller sub-class of microcontrollers, which themselves are integrated circuits under the semiconductor umbrella. PIC16C/PIC16HV devices target cost-sensitive, deterministic control applications where code protection, ultra-low sleep current, and a small footprint matter more than large memory or high clock speed. Key features of the PIC16HV540-20I/SS include a 12-bit instruction word with 33 single-word/35 single-cycle instructions, an 8-bit real-time timer/counter with 8-bit programmable prescaler, watchdog timer with on-chip RC oscillator, internal power-on reset, internal MCLR pull-up, code protection, power-saving SLEEP mode, selectable oscillator options (RC, XT, LP, HS), and an operating voltage range of approximately 3.5 V to 15 V delivered through the integrated HV shunt regulator from a higher external VPP. The architecture is a RISC Harvard design with separate program and data buses; the ALU is 8-bit and most instructions execute in a single instruction cycle except for program branches which take two cycles. The on-chip HV regulator eliminates the need for an external 7805-style regulator in many battery or high-voltage-bus designs, simplifying the BOM. Typical applications include low-cost battery-powered appliances, smoke detectors and CO sensors, electronic meters and utility metering front-ends, simple motor/relay drivers, automotive body controllers, and white-goods control boards. The device is well-suited wherever a small pin count, deterministic timing, and a wide unregulated supply range are priorities. When designing with the PIC16HV540-20I/SS, remember OTP memory cannot be re-programmed in-circuit - prototypes should be built with windowed (JW) or flash variants before committing. The integrated HV regulator dissipates excess voltage as heat, so thermal management of the shunt resistor and decoupling placement are important at high VPP voltages. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16HV540/JW - 8-bit 20MHz MCU, 768B EPROM, On-chip Voltage Regulator | Microchip
PIC16HV540/JW

PIC16HV540/JW - 8-bit 20MHz MCU, 768B EPROM, On-chip Voltage Regulator | Microchip

The Microchip Technology PIC16HV540/JW is an 8-bit, fully-static, EPROM/UV-erasable CMOS microcontroller in a windowed 18-pin CERDIP package, operating at a 20 MHz core clock. It integrates 768 bytes (512 x 12) of EPROM program memory and includes a high-voltage shunt regulator on-chip, allowing direct operation from 3.5 V to 15 V supplies without an external regulator. The "JW" suffix indicates the ceramic CERDIP package with a quartz window for UV erasure, supporting engineering prototype and development workflows where code iteration is frequent. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), working RAM, and programmable I/O into one package, allowing it to directly read sensors and drive actuators without external glue logic. The PIC16HV540 belongs to the PIC16C5X family lineage - 12-bit-wide instructions that compress 2:1 versus typical 8-bit MCUs, with only 33 single-word instructions, all single-cycle (200 ns at 20 MHz). On-chip peripherals include a watchdog timer, power-on reset, and a precision internal RC oscillator for reduced BOM cost. Key features: 25 ns instruction cycle at 20 MHz oscillator, 12-bit instruction word, 8-bit data path, 25 bytes of general-purpose RAM, 12 I/O pins with high-current sink/source capability (25 mA per pin, 100 mA total), on-chip voltage regulator accepting 3.5 V to 15 V, and a hardware watchdog timer for unattended operation. The part is pin- and software-compatible with the PIC16C54 baseline, simplifying migration from PIC16C5X code. UV-erase capability allows >100 erase/program cycles during development. The PIC16HV540's distinctive architecture blends RISC-style orthogonal 12-bit instructions with a one-accumulator Harvard memory model, where program and data buses are physically separate, eliminating fetch bottleneck. The on-chip high-voltage shunt regulator accepts wide-input rails and clamps the internal logic supply to a safe 5 V level, which is what gives the "HV" prefix its name. The UV-erase window enables long-term code evolution without tooling changes. Typical applications include embedded control with battery stacks (3-cell to 12-cell stacks fed directly), automotive body controllers (pre-CAN era), HVAC actuator drivers, security panels, white-goods controllers, industrial timer/counter modules, and remote sensor interfaces. The high-current I/O allows direct LED and relay drive without buffers. When designing with PIC16HV540/JW, ensure the VDD pin sees only the regulated internal rail while VIN feeds the shunt regulator directly. Decouple both pins locally with 100 nF ceramics. The windowed CERDIP package is bulkier than plastic OTP/SOIC variants but is the only option if UV erasure and reprogramming is required.

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PIC16HV540T-04/SO - 8-bit OTP MCU 4MHz 18-SOIC | Microchip
PIC16HV540T-04/SO

PIC16HV540T-04/SO - 8-bit OTP MCU 4MHz 18-SOIC | Microchip

The Microchip Technology PIC16HV540T-04/SO is a PIC16C-family 8-bit CMOS microcontroller with on-chip voltage regulator, 4 MHz maximum operating frequency, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 25 bytes of RAM, housed in an 18-pin SOIC package. Its integrated shunt-type voltage regulator accepts a wide 3.0 V to 15 V supply range and produces a regulated 5 V core rail, eliminating the need for an external LDO in many applications. The device executes instructions in a single 200 ns cycle (4 MHz oscillator / 1 µs instruction cycle) and uses the classic enhanced PIC16C5x 33-instruction RISC instruction set. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/OTP/Flash), working RAM, I/O peripherals, and clock generation onto one silicon die. The PIC16HV540 belongs to the taxonomy PIC16C -> PIC family -> 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor IC. It is a Harvard-architecture RISC device: program and data memories are separate, instructions are fixed-width single-word, and most instructions complete in one cycle, which keeps deterministic timing for interrupt-driven control loops. Key features of the PIC16HV540T-04/SO include 12 programmable digital I/O pins with high-current sink capability, an 8-bit timer/counter (TMR0) with a programmable prescaler, a watchdog timer with its own on-chip RC oscillator, power-on reset, brown-out detection, and an internal 4 MHz RC oscillator option. The on-chip voltage regulator lets the part run from a single 9 V or 12 V wall-adapter supply while still presenting a clean 5 V to downstream logic. Power-saving SLEEP mode drops current to the microamp range, suitable for battery-backed or energy-harvesting designs. Architecturally, the PIC16HV540 combines a 14-bit instruction word with an 8-bit data path and a two-stage pipeline. Program memory is OTP, allowing one-time customization for production volumes. The 12-bit-wide instruction words are fetched from the 512-word OTP array while the 25-byte general-purpose RAM handles variables and stack. The integrated voltage regulator is a parallel/shunt regulator rather than a series LDO, which means the input is tolerant of high voltages (commonly 9 V or 12 V) but cannot source large output currents to external loads. Typical applications include low-cost appliance controllers, LED lighting controllers, remote controls, sensor signal conditioning with on-board A/D-free logic, automotive interior modules (non-safety), battery chargers, and any 8-bit embedded node that benefits from wide input voltage tolerance. The 25-byte RAM and 768-byte OTP keep it best suited to compact deterministic control rather than data-rich connectivity stacks. Designers should choose this MCU when wide-input-voltage single-rail operation and ultra-low BOM cost matter more than peripheral density. The SOIC-18 footprint and 33-instruction core make firmware migration from other PIC16C5x parts straightforward. Note that OTP means firmware cannot be field-updated - mask-ROM equivalents (PIC16CR540) or Flash PIC16F equivalents should be considered when in-system reprogrammability is required.

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PIC16HV540T-04I/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip
PIC16HV540T-04I/SO

PIC16HV540T-04I/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16HV540T-04I/SO is an 8-bit, fully-static CMOS microcontroller built around the PIC16C5x architecture, integrating a unique on-chip shunt voltage regulator that allows direct operation from supply rails of 3.5V to 15V without external regulation. It executes instructions at 4 MHz, ships in an 18-SOIC surface-mount package, and contains 768 bytes (512 x 12) of One-Time-Programmable (OTP) EPROM program memory with 25 bytes of general-purpose RAM and a hardware 8-bit timer/counter. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one die. The PIC16C family uses a Harvard architecture with 12-bit-wide instructions and 33 single-word opcodes, achieving approximately 2:1 code compression versus competing 8-bit MCUs in its class. The on-chip shunt regulator places the PIC16HV540 into the power-management-aware microcontroller category, suitable for direct battery or unregulated bus operation. Key differentiating features of the PIC16HV540T-04I/SO include the integrated high-voltage shunt regulator (eliminating external regulator cost), 12 bidirectional I/O pins with high-current sink capability, a Watchdog Timer with dedicated on-chip RC oscillator, Power-on Reset, and an industrial operating temperature range of -40C to +85C. The 33-instruction RISC-like instruction set enables deterministic single-cycle execution except for program branches, simplifying real-time control firmware development. Architecturally, the PIC16HV540 combines a 4 MHz internal instruction clock with two hardware interrupt sources (external INT pin and timer overflow), an 8-bit real-time clock/counter with 8-bit prescaler, and a CONFIG word for oscillator, watchdog, code-protect, and timer mode selection. OTP program memory supports low-volume production runs, while the integrated shunt regulator simplifies power-tree design in cost-sensitive embedded systems. Typical applications include industrial control logic, automotive body electronics, low-cost consumer appliance controllers, battery-powered sensor nodes, and replacement of legacy PIC16C5x designs. Designers select this part when unregulated 12V or battery power is available and bill-of-material cost is critical. A key design consideration is that OTP memory cannot be re-programmed; for prototyping, prefer the windowed JW package. The shunt regulator dissipates excess voltage as heat - at 15V input and 5V Vdd load, thermal management of the SOIC package must be verified. This page synthesizes XAIPART distributor pricing, same-family pin-compatible Microchip variants, drop-in cross-references, and practical design notes not consolidated on the manufacturer datasheet, giving engineers a single decision-ready reference.

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PIC16HV540T-20/SS - 8-Bit 20MHz OTP MCU with Shunt Regulator | Microchip
PIC16HV540T-20/SS

PIC16HV540T-20/SS - 8-Bit 20MHz OTP MCU with Shunt Regulator | Microchip

The Microchip Technology PIC16HV540T-20/SS is an 8-bit CMOS PIC microcontroller with an integrated high-voltage shunt regulator, supplied in a 20-pin SSOP package. It operates at up to 20 MHz with 200 ns instruction execution, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 x 8 bytes of general-purpose RAM. The 'HV' suffix denotes the on-chip shunt regulator that allows direct operation from supplies up to 15 V without an external 5 V LDO. An 8-bit PIC microcontroller is a RISC-based single-chip computer that combines a CPU, non-volatile program memory, RAM, and peripherals on a single silicon die. PIC microcontrollers sit within the broader taxonomy of microcontrollers -> embedded processors -> semiconductor ICs. The PIC16HV540 belongs to the enhanced PIC16C5x family and is designed for cost-sensitive, high-voltage applications where a small instruction set, deterministic timing, and minimal external components are priorities. The integrated shunt regulator simplifies power design in industrial control and automotive subsystems. Key features include 33 single-word single-cycle instructions delivering 2:1 code compression versus typical 8-bit CISC architectures, a wide 3.5 V to 15 V supply range accommodated by the on-chip regulator, 12 I/O pins with high-current sink capability, an 8-bit timer/counter, and a watchdog timer for reliable unattended operation. The device supports external RC and crystal oscillator modes and offers a power-saving SLEEP mode. Twelve-bit-wide instructions simplify arithmetic-heavy code. The PIC16HV540 architecture uses a Harvard-style two-bus design separating program and data memory, enabling simultaneous instruction fetch and operand access. The OTP program memory uses EPROM cells that are one-time programmable, suitable for low-to-medium volume production. The integrated shunt regulator monitors VDD and clamps excess voltage, allowing direct connection to loosely regulated rails such as 12 V battery or 24 V industrial supplies after a series dropping resistor. Typical applications include battery chargers, LED drivers, capacitor discharge circuits, remote controls, and simple sensor interfaces where the wide supply tolerance eliminates external regulation. The PIC16HV540 is well-suited to appliance controls, automotive accessory modules, and standalone low-cost embedded controllers. When designing with this part, choose the series dropping resistor so that worst-case shunt current remains above the regulator minimum (typically 5 mA) at the lowest expected input voltage. Add adequate bulk capacitance at VDD to absorb inrush current and decouple high-frequency noise from the shunt regulator. This page consolidates distributor pricing, drop-in SSOP-20 alternatives within the PIC16HV540 family, and design guidance not present on a typical catalog page.

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PIC16HV540T-20I/SO - 8-Bit OTP MCU 20MHz 768B | Microchip
PIC16HV540T-20I/SO

PIC16HV540T-20I/SO - 8-Bit OTP MCU 20MHz 768B | Microchip

The Microchip Technology PIC16HV540T-20I/SO is an 8-bit PIC® 16C-series microcontroller with on-chip shunt voltage regulator, 768 bytes of OTP program memory organized as 512 x 12-bit words, and 25 bytes of general-purpose RAM. Housed in a surface-mount 18-SOIC package (0.295" / 7.50 mm body width) with 12 programmable I/O pins, the device runs at 20 MHz maximum clock and accepts a wide 3.5 V to 15 V supply. An 8-bit microcontroller (MCU) is a small single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral I/O on a single silicon die. Within the broader taxonomy, the PIC16HV540 sits at: 8-bit MCU -> RISC microcontroller -> PIC® 16C family -> EPROM/OTP-based device -> embedded controller -> semiconductor IC. OTP variants are one-time programmable and intended for low-to-medium-volume production or where firmware is final and code-protection is required. Key features of the PIC16HV540 include the integrated shunt (HV) voltage regulator that lets the part operate directly from an unregulated high-voltage supply, an industrial -40 °C to +85 °C operating range denoted by the "I" suffix, and 33 single-word RISC instructions with a 2:1 code compression advantage over competing 8-bit architectures. The wide supply window simplifies power-tree design in appliances, automotive accessory modules, and battery chargers. The PIC16HV540 uses a Harvard RISC core with 12-bit-wide instructions and a 20 MHz oscillator input, gated through an internal 4-state instruction pipeline. On-chip peripherals include a watchdog timer, power-on reset, and a programmable I/O structure. The on-die HV regulator converts an external high-voltage source to the internal logic supply without an external regulator IC, reducing BOM cost. Typical applications include white-goods and appliance control, automotive accessory controllers, battery chargers, uninterruptible power supplies (UPS), and remote sensor nodes. The wide voltage tolerance suits 12 V automotive and 9 V battery-powered systems where a conventional 5 V MCU would otherwise require an external regulator. When designing with this part, leave adequate decoupling on VDD (typically 0.1 µF + 10 µF), respect the 4 MHz instruction-cycle derivative implied by the 20 MHz oscillator input, and verify that OTP programming timing falls inside the device programming specification. Industrial-grade screening makes this part preferable over the commercial "-20/SO" variant for harsh environments. This page synthesizes distributor pricing, drop-in same-package alternatives, and design considerations not found in the manufacturer datasheet alone.

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PIC16HV540T-20I/SS - 8-Bit 20MHz OTP MCU w/ Voltage Regulator | Microchip
PIC16HV540T-20I/SS

PIC16HV540T-20I/SS - 8-Bit 20MHz OTP MCU w/ Voltage Regulator | Microchip

The Microchip Technology PIC16HV540T-20I/SS is an 8-bit CMOS OTP microcontroller based on the Enhanced PIC16C54 core, integrating an on-chip shunt voltage regulator and packaged in a 20-pin SSOP. It executes instructions in a single 200 ns cycle at 20 MHz and offers 768 bytes (512 x 12) of OTP program memory, 25 bytes of RAM, and 12 I/O pins. What is an 8-bit OTP microcontroller? It is a small, single-chip computer built around an 8-bit data path, using One-Time-Programmable (OTP) ROM/EPROM for program storage. The PIC16HV540 belongs to the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> PIC16 family -> PIC16C5x enhanced sub-family. Its distinguishing trait is the on-chip high-voltage shunt regulator that lets the part run directly from an unregulated 3.5 V to 15 V supply without an external 5 V regulator, simplifying offline and appliance designs. Key features include a 12-bit wide instruction word that delivers 2:1 code compression versus competing 8-bit MCUs, only 33 single-word instructions to learn, and a DC to 20 MHz operating range with 200 ns instruction cycle. The device includes a Watchdog Timer with on-chip RC oscillator, Power-on Reset, and code-protection for the OTP array. The integrated shunt regulator eliminates the external LDO typically required for 12 V supply rails. Technically, the Enhanced PIC16C54 architecture uses a two-stage pipeline with a 12-bit instruction word fetched in one cycle and executed in the next, yielding deterministic single-cycle throughput. The on-chip shunt regulator can be configured as a 5 V zener-like reference or a feedback-stabilized 3 V / 5 V rail, easing direct connection to 12 V batteries and rectified mains-derived rails. Typical applications include white-good appliance control, battery chargers, LED drivers, remote controls, smart meters, and any cost-sensitive embedded node where a single 3.5-15 V supply should power the MCU without a separate regulator. Industrial and automotive subsystems (non-safety) also adopt it for its wide supply tolerance. When designing with this part, note that OTP memory cannot be re-programmed in-circuit - prototypes should use the JW or windowed CERDIP variant. The SSOP-20 package is best suited to moderate-volume SMT production. This page synthesizes distributor pricing, drop-in alternatives within the PIC16HV540 family, and practical design notes that go beyond the manufacturer datasheet.

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PIC16HV610-E/ML - 1.75KB Flash 8-bit MCU, 20MHz, High-Voltage | Microchip
PIC16HV610-E/ML

PIC16HV610-E/ML - 1.75KB Flash 8-bit MCU, 20MHz, High-Voltage | Microchip

The Microchip Technology PIC16HV610-E/ML is a 14-pin, Flash-based 8-bit CMOS microcontroller from the PIC16F610/16HV610/16F616/16HV616 family, housed in a 16-pin QFN (ML) package with 1.75 KB of Flash program memory and 72 bytes of RAM. It integrates an 8 MHz internal oscillator, two analog comparators, a 10-bit A/D converter (on the F616/HV616 sibling variants), and the unique shunt regulator (high-voltage) feature that enables direct operation from 2 V to 15 V supply rails without an external regulator. A high-voltage PIC microcontroller is a variant of the standard PIC16 baseline family that integrates an internal shunt regulator on the VDD pin, allowing the part to source current from a higher-voltage bus while clamping VDD to a safe logic level. This makes the PIC16HV610 part of the microcontroller -> 8-bit MCU -> PIC16 baseline -> high-voltage PIC hierarchy, sitting alongside general-purpose logic and analog peripherals for sensor and motor control. The HV610 suffix specifically refers to the internal shunt regulator block, distinguishing it from the lower-voltage PIC16F610 sibling. Key features include 1.75 KB self-programmable Flash, 72 B SRAM, 128 B EEPROM (HV616 variant), two enhanced analog comparators with programmable on-chip reference, an internal 8 MHz oscillator, and a wide 2 V to 15 V operating range enabled by the integrated shunt regulator. The 16-pin QFN package gives a compact 4x4 mm footprint suitable for high-density designs, while the industrial-grade -40C to +125C operating range supports automotive, industrial, and appliance environments. Technically, the PIC16HV610 uses a 14-bit instruction word RISC architecture with a hardware stack of 8 levels, single-cycle instructions except for branches, and a 20 MHz maximum clock speed from an external source or the internal 8 MHz oscillator. The integrated shunt regulator removes the need for an external LDO in 12 V or 24 V bus systems, reducing BOM cost and PCB area. NanoWatt Technology provides power-managed sleep modes for battery and energy-harvesting applications. Typical applications include high-voltage sensor interfaces, white-good and appliance control, automotive interior modules, battery chargers, LED lighting controllers, and 12 V/24 V industrial sensor signal conditioning. The internal shunt regulator and two comparators make it especially well-suited to analog front-end tasks where the MCU must coexist on a high-voltage rail. When designing with this part, designers should consider the shunt regulator's current limit and power dissipation: at 15 V input the shunt can dissipate up to ~0.9 W into VDD, requiring thermal management per the datasheet. The HV610 variant does not include the 10-bit ADC; choose PIC16HV616-I/ML if ADC is required. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16HV610-I/ML - 1.75KB Flash 8-bit MCU, 20MHz, QFN-16 | Microchip
PIC16HV610-I/ML

PIC16HV610-I/ML - 1.75KB Flash 8-bit MCU, 20MHz, QFN-16 | Microchip

The Microchip Technology PIC16HV610-I/ML is a 14-bit instruction-width, 8-bit Flash-based CMOS microcontroller from the PIC® 16F family, packaged in a 16-pin QFN with exposed pad. It integrates 1.75 KB of Flash program memory (1K x 14), 72 bytes of RAM, and a high-voltage shunt regulator that allows direct operation from supply rails up to 15 V without an external regulator. The CPU executes instructions at up to 20 MHz from an internal oscillator or external clock source. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash/ROM), volatile working memory (RAM), and peripheral blocks such as timers, ADCs, comparators, and communication interfaces on one die. Within the embedded hierarchy, this part belongs to the 8-bit MCU class (microcontroller -> MCU -> microcontroller IC -> integrated circuit -> semiconductor). PIC16 devices target low-pin-count, low-cost embedded control tasks such as appliance timers, LED drivers, sensor conditioning, and simple user-interface firmware. Key features include 11 I/O pins with interrupt-on-change capability, a 10-bit ADC with up to 8 input channels, two analog comparators with programmable references, an Enhanced Capture/Compare/PWM (ECCP) module, and an internal 8 MHz oscillator. The integrated high-voltage shunt regulator (HV) accepts VIN from 2 V up to 15 V, allowing direct bus connection in 12 V systems. The device supports in-circuit serial programming (ICSP) via two pins and operates across -40 °C to +85 °C industrial temperature range. The PIC16HV610 uses a 14-bit wide instruction set with a modified Harvard architecture, where program and data buses are separated for predictable single-cycle execution of most instructions. The HV shunt regulator and wide VIN tolerance remove the need for an external LDO in 12 V battery or industrial bus systems, simplifying BOM and reducing board area. Typical applications include LED lighting controllers, battery chargers, appliance timers, smoke detectors, simple sensor interfaces, and 12 V industrial sensor nodes. The 2 V minimum supply voltage also enables direct use with two-cell battery packs. When designing with this MCU, allocate at least one ICSP clock/data pair (RB6/RB7) for in-circuit programming and verify the exposed thermal pad is soldered to a sufficient copper pour for thermal dissipation under sustained peripheral activity. The 72-byte RAM constrains stack depth and large arrays, so prefer small state machines over recursive algorithms. This page synthesizes distributor pricing, drop-in alternatives from the PIC16F610/616 family, and practical design notes for 12 V direct-supply designs not consolidated in any single manufacturer document.

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PIC16HV610-I/SL - 8-bit 20MHz MCU 1.75KB Flash | Microchip
PIC16HV610-I/SL

PIC16HV610-I/SL - 8-bit 20MHz MCU 1.75KB Flash | Microchip

The Microchip Technology PIC16HV610-I/SL is an 8-bit PIC16-family flash microcontroller with an integrated shunt voltage regulator, delivering up to 20 MHz CPU performance from 1.75 KB of flash program memory in a 14-pin SOIC (SL) package. The 'HV' variant includes an internal high-voltage shunt regulator that allows direct connection to supplies up to 15 V without an external regulator, simplifying off-line and battery-stack designs. What is an 8-bit microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripherals on one die. Within the embedded hierarchy, PIC16 MCUs sit below PIC18/PIC24 and above baseline PIC10/12 devices, balancing code density (14-bit instruction word), peripheral count, and cost for cost-sensitive control applications. Key features include 64 bytes of RAM, 11 digital I/O pins with interrupt-on-change capability, an 8-channel 10-bit ADC, two analog comparators, a hardware timer0/timer1/timer2 set, and a built-in 5-bit DAC on the comparator reference. The integrated shunt regulator accepts input voltages from 2 V (at 8 MHz) up to 15 V (via shunt), eliminating the need for an external 5 V LDO in many mains-derived designs. Typical applications include LED driver controllers, battery chargers, smoke and CO detectors, mains-powered sensor interfaces, and off-line appliance control. Designers favor the HV610 series for its ability to operate directly from rectified mains via a Zener/shunt arrangement, reducing BOM cost by one or two external regulators. When designing with the PIC16HV610, choose between the SL (SOIC-14) and ML (QFN-20) packages based on board area constraints. Always place the shunt regulator's series resistor to limit current to the datasheet-specified maximum and add bulk decoupling on the regulated rail. A free MPLAB X IDE with XC8 compiler supports the device for code development and debug.

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