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PCA9615DPZ - 2-Ch I2C Fast-Mode Plus Diff Buffer | NXP
PCA9615DPZ

PCA9615DPZ - 2-Ch I2C Fast-Mode Plus Diff Buffer | NXP

The NXP Semiconductors PCA9615DPZ is a 2-channel multipoint Fast-mode Plus differential I2C-bus buffer with hot-swap logic, operating up to 1 MHz, housed in a 10-pin TSSOP (SOT552-1) package. It supports standard I2C, Fast-mode, and SMBus compatibility, with single-ended I2C on the card side up to 540 pF and differential I2C on the cable side supporting multi-drop bus up to 3 meters. The device uses an external DCEN pin to enable/disable the differential driver and operates from dual supplies, typically VDD(A) on the single-ended side and VDD(B) on the differential side. A signal buffer, repeater, or redriver is an active interface IC placed in-line on a bus to restore signal integrity when the load capacitance or physical distance exceeds the limit of the bus specification. In the I2C hierarchy, this part is a specialized bus extender/repeater that converts a single-ended SDA/SCL pair into a differential pair for transmission over twisted-pair or shielded cable, then converts back at the far end. This is essential in industrial control, automotive sensor backbones, and large backplane systems where standard I2C's capacitive limit (~400 pF) is insufficient. Key features of the PCA9615DPZ include differential transmission across a cable up to 3 meters at Fast-mode Plus speeds, hot-swap logic that allows the card to be inserted into a live backplane without disturbing the bus, wide supply range (2.7 V to 5.5 V on VDD(A) and 3.0 V to 5.5 V on VDD(B)), and AEC-Q100 qualification for automotive applications. The hot-swap circuitry prevents inrush current and bus glitches during card insertion. The differential pair uses low-voltage signaling to reduce EMI compared to single-ended transmission. Typical applications include industrial I2C backplane extension, automotive sensor networks, hot-swappable I/O cards, multi-drop I2C sensor clusters, and remote sensor/PCI configuration. The device is particularly valuable where cables must span meters between cards, sensors, or backplane slots, and where live insertion is needed without disrupting the system bus. When designing with this part, ensure both VDD rails are decoupled with 100 nF ceramic capacitors placed within 5 mm of the supply pins. Verify the differential pair routing on the cable side is twisted-pair or shielded to meet EMI requirements; the part itself does not include cable termination resistors, so external 100 ohm differential termination may be required at the far end for very long runs.

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PCA9616PW - 3-Channel Differential I2C Bus Buffer | NXP
PCA9616PW

PCA9616PW - 3-Channel Differential I2C Bus Buffer | NXP

The NXP Semiconductors PCA9616PW is a dual-supply, 3-channel multipoint Fast-mode Plus (Fm+) differential I2C-bus buffer with hot-swap logic, packaged in a 16-pin TSSOP (PW) surface-mount package. It buffers the single-ended SMBus/I2C-bus up to 1 MHz and converts it to a differential I2C (dI2C) bus that reliably extends communication through electrically noisy environments over cable runs of at least 3 meters, or longer at reduced clock speeds. A differential I2C-bus buffer, sometimes called a bus repeater or redriver, is an interface IC that belongs to the signal buffer family within the broader hierarchy of interface integrated circuits. Where a plain I2C bus uses open-drain single-ended lines vulnerable to ground bounce and common-mode noise, a dI2C buffer translates the bus into a differential current-mode signaling scheme, dramatically improving common-mode noise immunity while remaining fully compatible with existing Standard-mode, Fast-mode, and Fast-mode Plus I2C and SMBus devices. Key features of the PCA9616PW include its 3-channel multipoint architecture, which supports a dI2C bus shared by multiple nodes for multipoint topologies; its dual-supply design isolating the single-ended side from the differential side; support for Fast-mode Plus operation at 1 MHz; and integrated hot-swap logic that allows a card or module to be inserted into or removed from a live backplane without corrupting bus transactions. Signal direction is fully automatic, requiring no external direction-control signal. Technically, the device pairs each single-ended SDA and SCL line with differential transmit/receive pairs on the cable side, using current-mode differential drivers and receivers with high common-mode noise rejection. Because it is a multipoint buffer, several PCA9616 devices can share one differential cable, enabling distributed systems such as rack-mounted cards, industrial backplanes, and remote sensor clusters. NXP documents cable extension of at least 3 m, with longer runs achievable at lower bus speeds. Typical applications include industrial backplane I2C distribution, telecom and server shelf management, multipoint sensor networks in electrically noisy factory environments, and hot-pluggable module bus extension. The hot-swap logic makes it especially suitable for field-replaceable cards. Design consideration: plan the differential bus topology to respect multipoint stub-length limits, and verify supply sequencing on both the single-ended and differential rails against the manufacturer datasheet to guarantee correct hot-swap behavior. This page synthesizes distributor pricing, drop-in replacement analysis, and practical design notes not found in the manufacturer datasheet.

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PCA9618UKZ - Single-Channel Fm+ I2C Bus Repeater | NXP
PCA9618UKZ

PCA9618UKZ - Single-Channel Fm+ I2C Bus Repeater | NXP

NXP Semiconductors PCA9618UKZ is a single-channel CMOS repeater for Fast-mode Plus I2C-bus or SMBus signals, with a 4-WLCSP package measuring 0.83 mm by 0.78 mm. It can buffer either the SCL clock line or the SDA data line, and it also supports single-bit buffering applications. An I2C bus repeater is an interface IC that regenerates a digital communication signal between a bus controller and a downstream device. Repeaters extend usable bus distance, isolate capacitive loading, improve signal integrity, and allow separate bus segments to operate at compatible logic levels. In the broader semiconductor hierarchy, the PCA9618UKZ is a bus repeater, then an interface IC, then an integrated circuit and semiconductor. The principal benefit of the PCA9618UKZ is its combination of Fm+ I2C or SMBus compatibility, one-bit architecture, and compact WLCSP-4 footprint. The small package supports placement close to a connector, bus branch, or device interface. Its single-channel format also allows designers to add buffering where required rather than fitting a multi-channel device that would remain unused. The device is intended for separating clock and data paths when capacitive loading, bus extension, or signal-integrity constraints become important. In a typical implementation, the incoming side connects to the host or bus master, while the output side drives a downstream peripheral. The buffered path reduces the electrical loading seen by the source while maintaining the logic signaling required by I2C-compatible devices. Typical uses include sensor networks, industrial controllers, consumer equipment, communications modules, and compact embedded systems that use I2C or SMBus. The device is also suitable for generic single-bit level translation or buffering where the system requires regenerated logic rather than a multi-channel fixed-direction translator. Designers should place the repeater near the branch or load that requires isolation, verify timing margins at the intended bus rate, and account for package parasitics and board-level capacitance. The 4-WLCSP footprint also demands careful PCB layout, stencil and reflow control, and inspection because its ball pitch and dimensions leave little room for rework. This page consolidates the confirmed function, package information, sourcing details, interface considerations, and drop-in replacement status of the PCA9618UKZ. It also distinguishes verified device facts from electrical parameters that engineers must confirm in the NXP product specification before finalizing a design.

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PCA9641PWJ - 2-Channel I2C Bus Arbiter | NXP
PCA9641PWJ

PCA9641PWJ - 2-Channel I2C Bus Arbiter | NXP

The NXP Semiconductors PCA9641PWJ is a 2-channel I2C bus controller arbiter and 2-to-1 master demultiplexer packaged in a 16-pin TSSOP. It is designed for dual-controller I2C systems in which two bus masters may issue commands simultaneously. The arbitration function selects one controller as the winner, allows that controller to operate without interruption, and enables the losing controller to take control when arbitration is required. An I2C controller arbiter is a specialized interface IC that manages competing requests to use a shared two-wire bus. The broader hierarchy is I2C controller arbiter, I2C bus interface, interface IC, semiconductor, and electronic component. Unlike a conventional I2C bus switch or channel multiplexer, the PCA9641 is specifically intended to arbitrate between two master controllers while also routing commands through a 2-to-1 master demultiplexer. The manufacturer identifies the PCA9641 as a 2-to-1 I2C master demultiplexer with an integrated arbiter function. Its principal role is high-reliability dual-master operation: the arbiter elects a winning master and prevents simultaneous masters from interfering with one another. The losing master can subsequently assume control of the shared I2C bus when the winning master releases it. This behavior is useful where deterministic bus ownership is needed more than simply routing separate I2C branches. Typical PCA9641PWJ applications include redundant or alternate industrial controllers, dual-processor instrumentation, embedded test equipment, controller isolation in complex electronics, and systems in which two embedded masters share access to the same peripheral bus. The device helps centralize command arbitration close to the I2C domain, reducing the need for firmware-level coordination during simultaneous access attempts. The PCA9641PWJ is identified by NXP as a 16-TSSOP device, and distributor listings classify it as a two-channel buffer and multiplexer. Because arbitration behavior depends on the complete circuit, designers should follow the manufacturer datasheet for pin assignments, electrical limits, operating conditions, timing, and recommended application wiring rather than relying on generic I2C-switch schematics. For PCB implementation, place the device close to the controlled I2C segment, route clock and data traces as a matched pair, and keep the arbitration inputs, master request signals, and bus connections away from noisy switching stages. The 16-pin TSSOP footprint supports compact designs, but power, ground, and signal-integrity requirements should be checked against the latest NXP documentation before layout release. This page organizes the exact product identity, manufacturer documentation, package information, application context, and verified replacement information for PCA9641PWJ. It also distinguishes true drop-in candidates from parts that are only functionally similar, helping engineers assess PCB reuse without assuming that equivalent bus-routing functions guarantee identical pin compatibility.

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PCA9670BS,118 - 8-bit Fm+ I2C I/O Expander w/ Reset, HVQFN-16
PCA9670BS,118

PCA9670BS,118 - 8-bit Fm+ I2C I/O Expander w/ Reset, HVQFN-16

The NXP PCA9670BS,118 is a remote 8-bit I/O expander for Fast-mode Plus (Fm+) I2C-bus with reset, packaged in a 16-pin HVQFN (3x3 mm) with exposed thermal pad. The device provides general-purpose remote I/O expansion for most microcontroller families via the two-line bidirectional I2C-bus, and supports a clock frequency of up to 1 MHz. Operating supply range is 2.3 V to 5.5 V, allowing use with 3.3 V and 5 V logic rails. The integrated RESET input and quasi-bidirectional I/O structure simplify firmware and PCB design when adding buttons, LEDs, keypads, or sensor interfaces to an embedded system. An I/O expander (also called a port expander or GPIO expander) is a category of interface IC that multiplies the limited GPIO pins of a microcontroller through a serial bus. In the taxonomy I/O expander -> interface IC -> integrated circuit -> semiconductor, the PCA9670BS sits in the parallel-bus-expansion tier and uses I2C as the transport. By attaching the part to SCL/SDA, designers gain eight additional quasi-bidirectional I/O pins addressed through a 7-bit slave address. Three hardware address pins (A0, A1, A2) allow up to 64 PCA9670 devices on the same bus, supporting up to 512 I/Os (for example 512 LEDs) without external bus buffers. Key features include 1 MHz Fm+ bus support (compared with 400 kHz for the classic PCF8574), a hardware RESET pin that reverts all ports to inputs, low standby current, and 5 V tolerant I/O structure that tolerates bus pulls above VDD. The HVQFN-16 (3x3) package provides a low 0.5 mm profile with an exposed die attach paddle for improved thermal performance, making it suitable for compact industrial, consumer, and IoT designs. NXP specifies ESD protection exceeding 2 kV HBM on the I/O pins, and the part is qualified to the industrial -40 C to +85 C operating range. The PCA9670 architecture uses an I2C state machine with interrupt logic for input-change notifications and a separate RESET input that asynchronously clears internal state. Internally each I/O pin is a quasi-bidirectional structure - capable of sinking current to drive LEDs directly while also serving as an input when written high. This dual-mode behavior differs from push-pull GPIO and is important when migrating designs from the older PCF8574/PCF8575 family. Typical applications include keypad and button-matrix scanning in white goods and access control, LED driving and chase patterns in industrial control panels, sensor multiplexing on Raspberry-Pi-class SBCs where the host lacks enough native GPIO, and general-purpose I/O expansion in PLC and HVAC controllers. The wide 2.3-5.5 V supply range plus 1 MHz Fm+ bus speed also suits battery-powered IoT nodes that need to minimize I2C transaction time. When designing with this part, place 100 nF decoupling close to VDD, use external pull-ups on SDA/SCL sized for the bus capacitance (typically 4.7 kohm at 1 MHz), and avoid leaving the RESET pin floating - tie it to VDD through a 10 kohm resistor or drive it from the host MCU. The I/O sink capability must be checked against LED forward current; sourcing current is limited and the quasi-bidirectional behavior must be considered when interfacing to logic-level peripherals. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the NXP datasheet.

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PCA9675PW,118 - 16-bit Fm+ I2C I/O Expander | NXP | TSSOP-24
PCA9675PW,118

PCA9675PW,118 - 16-bit Fm+ I2C I/O Expander | NXP | TSSOP-24

The NXP PCA9675PW,118 is a 16-bit remote I/O expander for the Fast-mode Plus (Fm+) I²C-bus, supplied in a 24-pin TSSOP (PW) package and shipped on 13-inch tape and reel. It operates from a supply voltage of 2.3 V to 5.5 V, clocks the I²C interface at up to 1 MHz, and exposes 16 quasi-bidirectional I/O lines that can source/sink up to 30 mA per pin with a 100 mA total package limit. An I/O expander (also called a port expander or GPIO expander) is a category of interface IC that increases the number of general-purpose I/O pins available to a host microcontroller over a serial bus such as I²C. In the system hierarchy it sits between the MCU and the discrete digital loads (LEDs, keypads, sensors, relay coils), translating compact I²C transactions into parallel pin-level updates. The PCA9675 belongs to NXP's Fm+ family, which is optimized for high-speed serial I/O expansion in noisy or long-trace industrial backplanes. Key features include three hardware address pins (A0/A1/A2) supporting up to eight PCA9675 devices on the same bus, an active-low interrupt output (INT) that asserts when any input changes and releases on the next I²C read, an active-low reset input with internal power-on reset, and per-pin latch-up current exceeding the 100 mA JESD78 limit. The device is a drop-in upgrade for the legacy PCF8575, lifting bus speed from 400 kHz to 1 MHz and raising sink current capability. Typical applications include PWM dimming of LED arrays (each pin can be modulated at >1 MHz bus rates), keypad and switch-matrix scanning, fan-speed and relay control in industrial PLCs, and general-purpose I/O expansion for low-pin-count MCUs in white goods, HVAC, and IoT edge nodes. Designers value the wide 2.3–5.5 V supply range because it allows direct interface to both 3.3 V and 5 V microcontrollers without level shifters. When designing with this device, place 100 nF decoupling on VDD as close as possible to the pin and pull SDA/SCL high with 4.7 kΩ resistors for standard 400 kHz operation or 1 kΩ for the full 1 MHz Fm+ rate. Note that quasi-bidirectional outputs require no external pull-up on the load side because an internal weak pull-up is enabled after each read cycle.

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PCA9703PW/Q900 - 16-bit SPI GPI, 18V Tolerant | NXP
PCA9703PW/Q900

PCA9703PW/Q900 - 16-bit SPI GPI, 18V Tolerant | NXP

The NXP Semiconductors PCA9703PW/Q900,118 is an 18 V tolerant, 16-bit SPI General Purpose Input (GPI) shift register with maskable interrupt output, housed in a 24-pin TSSOP (PW) package rated -40 C to +125 C. It operates as an SPI slave at up to 5 MHz and monitors 16 switch or logic inputs with 18 V input tolerance, making it a low-power solution for high-voltage switch status monitoring in automotive and industrial systems. A GPI (General Purpose Input) shift register is a type of input-only I/O expander within the broader hierarchy of interface ICs -> I/O expanders -> parallel-in serial-out shift registers. Unlike I2C GPIO expanders, SPI GPI shift registers stream input states to a microcontroller as a serial bit field, which minimizes pin count on the host MCU and gives deterministic, fast read-back of many switch contacts. Key features include 16 input-only channels tolerant to 18 V regardless of the device supply, a maskable INT output that flags any change of input state, a 3 V input switching threshold for robust noise immunity, and SPI compatibility up to 5 MHz. The Q900 suffix and /Q900,118 ordering code identify the automotive AEC-Q100 compliant variant with extended -40 C to +125 C operation; NXP states that PCA9703PW/Q900 is AEC-Q100 compliant and PPAP documentation is available via i2c.support@nxp.com. Technically, the PCA9703 samples its 16 GPI inputs into an internal shift register and shifts data out on MISO under host control of CS and SPI clock. Any input change (open, closed, or 12 V/24 V level via divider) triggers the interrupt output, which can be masked to prevent nuisance CPU wake-ups. The low-power CMOS process keeps static consumption minimal, which is critical for always-on battery-backed switch monitoring. Typical applications include automotive switch monitoring (door, window, seat, and steering-column switches), industrial control panels and limit-switch monitoring, and 12 V/24 V system status sensing where contacts ride on battery-level rails the chip inputs directly tolerate. A key design consideration is input threshold scaling: although inputs tolerate 18 V, the 3 V threshold means designers must confirm logic levels and switch pull-up arrangements so that a valid LOW is below threshold and a valid HIGH is safely above it across temperature. This page synthesizes distributor pricing, lifecycle status, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet alone.

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PCA9703PW/Q900,118 - 16-Bit SPI GPI 18V Tolerant | NXP
PCA9703PW/Q900,118

PCA9703PW/Q900,118 - 16-Bit SPI GPI 18V Tolerant | NXP

The NXP Semiconductors PCA9703PW/Q900,118 is an 18 V tolerant SPI 16-bit General Purpose Input (GPI) shift register with maskable interrupt output, supplied in a 24-pin TSSOP package rated for -40 C to +125 C automotive operation with a 4.5 V to 5.5 V supply and a 5 MHz SPI clock. A general purpose input shift register is a specialized interface IC that converts parallel logic levels from switches or sensors into a serial data stream. In the system hierarchy it sits between raw switch inputs and a microcontroller: instead of dedicating 16 MCU pins to switch monitoring, a single SPI port reads all 16 inputs as a serial word, reducing pin count, wiring harness complexity, and cost in distributed control systems. Key features include 18 V tolerance on all GPI pins, allowing direct connection to automotive battery-nominal rails without level shifting; a maskable interrupt output (INT) with an INT_EN pin that disables the inputs and interrupt to minimize battery drain in cyclically powered systems; and an SDIN pin with pull-down that supports daisy-chaining multiple devices on a single SPI bus for 32, 48, or more inputs. Architecturally, the PCA9703 uses a shift register with a dedicated output enable controlled by CS. The 3 V logic thresholds on the serial interface ensure compatibility with both 3.3 V and 5 V controllers. Switch status is captured in the parallel input register and shifted out MSB-first on SCLK edges, with the interrupt flag readable on the first serial byte so the MCU can branch quickly on any input change. Typical applications include automotive switch monitoring for door, seat, and steering-column controls, body control modules and keypads, and industrial panels requiring isolated or battery-tolerant digital inputs. The 18 V tolerance is the decisive parameter wherever switches are wired to unregulated supply rails. A key design consideration: the GPI inputs require external pull-up or pull-down resistors to the switched rail; the INT_EN pin should be driven low during system sleep to eliminate quiescent current drawn through those resistors. This page synthesizes distributor pricing, drop-in alternative analysis, design notes, and application guidance not found in the manufacturer datasheet, making it a one-stop engineering reference for the PCA9703PW/Q900,118.

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PCA9704PW/Q900 - 8-bit SPI GPI 18V Tolerant | NXP
PCA9704PW/Q900

PCA9704PW/Q900 - 8-bit SPI GPI 18V Tolerant | NXP

The NXP Semiconductors PCA9704PW/Q900 is an 8-bit, 18 V tolerant SPI General Purpose Input (GPI) shift register with maskable interrupt, AEC-Q100 qualified for automotive applications, housed in a 16-pin TSSOP (PW) package. It monitors the status of switch inputs and reads them out over a standard SPI interface running at up to 5 MHz. A general-purpose input expander is an interface IC that offloads switch or status-signal monitoring from a microcontroller. In the signal-chain hierarchy, the PCA9704 sits between discrete switch contacts and an MCU's SPI peripheral: GPIO expander -> interface IC -> mixed-signal logic device. Input expanders are used when an MCU lacks sufficient input pins or when switch signals sit at voltages higher than the MCU supply, as is common in automotive 12 V and 24 V electrical systems. Key features include eight input channels each tolerant to 18 V, allowing direct connection to battery-referenced switch contacts without external level shifting or clamping networks. The SPI interface supports read-out at up to 5 MHz, and a maskable interrupt output (INT) alerts the host controller only when inputs change, enabling low-power polled or event-driven system architectures. Technically, the PCA9704 is implemented as a parallel-in serial-out shift register with input latching. When the host asserts the chip-select, the current input state is latched and shifted out on the SPI data line; devices can be cascaded to expand beyond eight inputs on a single SPI bus. The /Q900 suffix denotes NXP's automotive product-line extension with AEC-Q100 compliance and PPAP support, distinguishing it from the commercial-grade PCA9704PW. Typical applications include automotive switch monitoring (door, seat, and key contacts), industrial control-panel status readback, and system diagnostics where battery-level fault or presence signals must be safely captured by a low-voltage controller. Design consideration: although the 18 V tolerance removes the need for input dividers, verify worst-case battery load-dump transients in automotive systems and confirm that the interrupt mask register is initialized before enabling INT to avoid spurious wake-ups at power-up. This page synthesizes distributor data, automotive-grade alternative options, and practical SPI integration notes not found in the manufacturer datasheet, with pricing verified as of 2026-10-19.

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PCAL6408AHK - 8-Bit I2C I/O Expander, XQFN-16 | NXP
PCAL6408AHK

PCAL6408AHK - 8-Bit I2C I/O Expander, XQFN-16 | NXP

The NXP Semiconductors PCAL6408AHK is a low-voltage translating, 8-bit general-purpose I/O expander with interrupt output, reset, and Agile I/O configuration registers, interfacing to a host microcontroller via I2C-bus/SMBus at up to 400 kHz in a 16-pin XQFN (1.8 x 2.6 mm) package. An I/O expander is a peripheral IC that adds extra general-purpose input/output pins to a microcontroller or embedded processor over a serial bus such as I2C or SMBus. In the system hierarchy, it sits within the interface IC family, under mixed-signal peripheral devices, and complements microcontrollers whose native GPIO count is exhausted. Expanders offload GPIO expansion while consuming only two bus wires (SDA, SCL), conserving processor pins and board routing. Key features include a wide supply range of 1.65 V to 5.5 V, dual power rails for true voltage level translation between logic domains, programmable output drive strength, and latchable inputs. The interrupt output and active-low reset provide robust event-driven and fault-recovery behavior in multi-slave I2C systems. The Agile I/O feature set - configurable output drive, input latch, and pull-up/pull-down enable - allows system designers to tune signal integrity and power per pin, which is significant in mixed-voltage designs where a 1.8 V MCU must safely drive 3.3 V or 5 V peripherals. Open-drain and push-pull operating modes over I2C/SMBus at 400 kHz provide flexible bus integration. Typical applications include GPIO expansion in portable and battery-powered devices, level translation between low-voltage processors and legacy 5 V peripherals, sensor and keypad scanning, LED control, and backplane status monitoring in industrial systems. Design consideration: because the XQFN-16 package measures only 1.8 x 2.6 mm, the exposed pad must be soldered to a grounded PCB land pattern for reliable thermal and mechanical performance; verify land-pattern tolerances before assembly. This page synthesizes distributor pricing context, drop-in alternatives, practical design notes, and AEO-optimized FAQs not found in the NXP datasheet.

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PCF2123BS/1 - SPI RTC Calendar IC | 16-HVQFN | NXP
PCF2123BS/1

PCF2123BS/1 - SPI RTC Calendar IC | 16-HVQFN | NXP

The NXP Semiconductors PCF2123BS/1 is a CMOS Real-Time Clock (RTC) and calendar with a Serial Peripheral Interface (SPI-bus) operating up to 6.25 Mbps, supplied at 1.1 V to 5.5 V, packaged in a 16-pin HVQFN exposed-pad package. It integrates time-of-day, calendar, alarm, timer and interrupt functions with an integrated 32.768 kHz crystal resonator space on chip, drawing less than 100 nA at 2.0 V for ultra-low standby power. A Real-Time Clock (RTC) is a dedicated integrated circuit that maintains accurate time and date information independent of system power. RTCs sit within the broader category of power management companions and timing ICs, working alongside MCUs, FPGAs and SoCs to provide timekeeping during main-power-off conditions through a small backup cell or supercapacitor. They typically expose time registers in BCD format and communicate over serial buses such as I2C or SPI. The PCF2123BS/1 uses SPI for higher throughput where speed and noise immunity matter. Key features include a wide 1.1 V to 5.5 V supply range, less than 100 nA typical current consumption at 2.0 V, integrated alarm and timer functions, an interrupt output, and a wide operating temperature range suitable for industrial environments. The device is supplied in a compact 3 mm x 3 mm HVQFN-16 plastic package with a thermal pad, drawing less than 0.2 microW of power to support battery-backed operation. The PCF2123BS/1 uses CMOS logic and on-chip tuning, allowing timekeeping accuracy to be compensated via load and trim registers. The SPI interface supports a maximum data rate of 6.25 Mbps, enabling fast register access by host processors. The integrated power-on reset and trickle charger functionality simplify backup power design. Typical applications include battery-backed timekeeping in metering, data loggers, industrial controllers, white goods and IoT sensor nodes, and any portable embedded system that needs a low-power accurate wall-clock reference independent of the main MCU. When designing with this device, place a 100 nF decoupling capacitor close to VDD and connect the exposed thermal pad to a clean ground pour. Always handle the SPI chip-select correctly to avoid bus contention with other peripherals on the same SPI bus. The NXP product page notes End-of-Life status, so check availability before new designs. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not consolidated in the manufacturer datasheet, providing engineers with a faster decision path.

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PCF51JM128EVLK - 32-Bit ColdFire V1 MCU, 128KB Flash | NXP
PCF51JM128EVLK

PCF51JM128EVLK - 32-Bit ColdFire V1 MCU, 128KB Flash | NXP

The NXP PCF51JM128EVLK is a 32-bit ColdFire V1 microcontroller from the MCF51JM Series, delivering 50 MHz core performance with 128 KB of embedded Flash and 16 KB of SRAM, housed in an 80-pin LQFP (14x14 mm) package. It integrates USB OTG, CAN, I2C, SCI, and SPI connectivity in a single device, targeting cost-sensitive industrial and embedded USB applications. Background Knowledge: A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), working memory (RAM), and peripheral interfaces (UART, timers, ADC, GPIO, USB, CAN, etc.). ColdFire V1 is NXP's 32-bit RISC architecture derived from the original Motorola 68000 instruction set, optimized for embedded systems that need higher performance than 8/16-bit MCUs without the overhead of ARM Cortex-M cores. MCF51JM Series specifically adds USB On-The-Go capability, making it a popular choice for USB peripherals and industrial controllers. Key differentiating features include the integrated USB 2.0 Full-Speed OTG controller (with on-chip transceiver and pull-up/pull-down resistors), 66 general-purpose I/O pins, and a rich peripheral set: 2x SCI (UART), 2x SPI, 2x I2C, 6-channel PWM, a 12-bit ADC, and a 16-bit timer. The 80-LQFP package provides generous pin count for multi-interface designs while remaining hand-solderable for prototyping. Technical depth: The ColdFire V1 core uses a 16/32-bit variable-length instruction encoding that balances code density with 32-bit throughput. The integrated USB OTG controller supports both device and host roles with internal 3.3V regulator and DP/DM pull resistors, eliminating external PHY components. The Flash controller supports in-application programming (IAP) and byte-level EEPROM emulation, allowing non-volatile data storage alongside the main 128 KB program image. Typical applications include USB-to-UART bridges, USB human-interface devices (HID), industrial control nodes with CAN connectivity, low-cost sensor hubs, and embedded controllers in appliances. The combination of USB, CAN, and multi-protocol serial interfaces makes it ideal for industrial gateways that aggregate sensor data over CAN and expose it to a host PC via USB. Design consideration: The USB D+/D- traces must be routed as a 90-ohm differential pair with length matching; bypassing the on-chip 3.3V regulator to power the MCU core requires a 4.7 uF decoupling capacitor on the VREG pin. The device operates from -40C to +85C industrial temperature range. This page synthesizes distributor availability, drop-in same-package alternatives, and design notes not found in the manufacturer datasheet to support sourcing and design decisions.

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PCF51JM128VLH - 32-bit ColdFire MCU, 128KB Flash, USB OTG | NXP
PCF51JM128VLH

PCF51JM128VLH - 32-bit ColdFire MCU, 128KB Flash, USB OTG | NXP

The NXP PCF51JM128VLH is a 32-bit ColdFire V1 MCF51JM microcontroller delivering 50 MHz CPU performance with 128 KB of Flash program memory and 16 KB of RAM, housed in a 64-pin LQFP (10x10 mm) package. It integrates USB OTG (On-The-Go) connectivity alongside CANbus, I2C, SCI, and SPI peripheral interfaces, and exposes 51 general-purpose I/O pins for mixed-signal embedded designs. What is a ColdFire microcontroller? ColdFire is a 32-bit reduced instruction set computing (RISC) architecture originally derived from the Motorola 68000 family and maintained today by NXP. Within the broader taxonomy, a ColdFire MCU belongs to the hierarchy: microcontroller -> embedded processor -> semiconductor. ColdFire V1 targets cost-sensitive, deterministic real-time applications, balancing 32-bit performance with low power consumption. It is widely deployed in industrial control, USB peripherals, automotive body electronics, and consumer devices where deterministic interrupt latency and a mature toolchain matter more than raw MHz. Key features of the PCF51JM128VLH include 128 KB of embedded Flash for program storage, 16 KB of SRAM for data and stack, a 50 MHz ColdFire V1 core, and integrated USB OTG with on-chip transceiver - eliminating the need for an external PHY. The device also includes a low-voltage detection (LVD) module, programmable watchdog timer, multiple PWM channels, and 51 GPIO pins. The 64-LQFP (10x10 mm) package provides ample pin count for mixed-signal designs while remaining compatible with hand-solderable and reflow processes. The integrated USB OTG controller is the defining architectural feature. Unlike MCUs that require an external USB peripheral controller, the PCF51JM128VLH implements the USB 2.0 full-speed transceiver, serialization, and protocol engine on-die. This simplifies USB device, host, and On-The-Go designs while reducing BOM cost. The ColdFire V1 core paired with hardware USB enables deterministic USB latency, which is valuable for industrial USB instrumentation, human-interface devices (HID), and point-of-sale terminals. Typical applications include USB HID peripherals such as custom keyboards and barcode scanners, industrial CAN nodes communicating over CANbus with USB diagnostics, USB-to-serial bridge converters, low-speed consumer devices with USB charging or data interfaces, and human-machine interface (HMI) panels with mixed digital I/O. The 128 KB Flash budget is sufficient for USB stacks (e.g., Freescale/NXP bare-metal or MQX-compatible USB frameworks) plus application code. When designing with this part, allocate sufficient decoupling on VDD (typically 100 nF + 10 uF bulk near the pins) and follow NXP's reference layout for the USB DP/DM differential pair. Because the device is in the obsolete lifecycle stage per the verified distributor data, validate long-term availability with your supply chain team before committing to new production runs. This page synthesizes distributor pricing, lifecycle status, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PCF51QU64VLF - Coldfire V1 MCU 32-Bit 50MHz 64KB Flash 48-LQFP | NXP Semiconductors
PCF51QU64VLF

PCF51QU64VLF - Coldfire V1 MCU 32-Bit 50MHz 64KB Flash 48-LQFP | NXP Semiconductors

The NXP Semiconductors PCF51QU64VLF is a 32-bit Coldfire V1 microcontroller from the MCF51Qx family, integrating 64KB of program flash and running at up to 50MHz core clock, housed in a 48-pin LQFP (7x7 mm) package. A microcontroller (MCU) is a single-chip computer that combines a CPU core, program and working memory, peripherals, and I/O on one die. The Coldfire V1 core is an NXP-specific implementation of a variable-length RISC architecture derived from the original Coldfire line, optimized for deterministic embedded control with low power consumption. MCUs sit hierarchically beneath microprocessors and systems-on-chip, and they dominate the embedded controller category in industrial, appliance, and consumer products. Key specifications include 64KB (64K x 8) embedded flash memory, 35 general-purpose I/O lines, and a peripheral set featuring DMA, LVD (low-voltage detect), POR (power-on reset), PWM channels, and an EBI/EMI external bus interface. Connectivity options include one I2C bus, one SPI bus, and one UART/USART channel. The device is characterized for a supply voltage range from 1.8V to 3.6V (with flash write voltage range specified separately), and operates across an extended industrial temperature range. The Coldfire V1 core implements a single-cycle multiply-accumulate and a tightly-coupled peripheral bridge, enabling deterministic interrupt latency suitable for motor control and power conversion loops. The 50MHz maximum CPU frequency yields approximately 50 MIPS of throughput, and the unified address space simplifies C-language firmware development with standard toolchains such as CodeWarrior. Typical applications include industrial control modules, low-end consumer appliances, smart sensor nodes, and small-format human-machine interface boards. The combination of 64KB flash and an external bus makes the PCF51QU64VLF especially well suited to designs that must execute a real-time control loop while still communicating with external memory-mapped peripherals. A critical design consideration is decoupling: place a 100nF ceramic bypass on each VDD/VSS pair within two millimeters of the package, and reserve a 4.7uF bulk capacitor near the regulator output. The external bus pins (EBI/EMI) require series termination when driving long PCB traces to avoid ringing. This page synthesizes distributor stock, drop-in alternatives from the same Freescale/NXP MCF51Q family, and practical design notes not found on a single manufacturer product page.

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PCF85176T/1 - 40x4 LCD Segment Driver I2C TSSOP-56 | NXP
PCF85176T/1

PCF85176T/1 - 40x4 LCD Segment Driver I2C TSSOP-56 | NXP

The NXP Semiconductors PCF85176T/1 is a universal LCD segment driver with 40 segments and 4 backplanes, packaged in a 56-pin TSSOP (TSSOP-56). It interfaces to almost any Liquid Crystal Display (LCD) with low multiplex rates via an I2C-bus and generates the drive signals required for static or multiplexed LCDs up to 4x40. The device supports a frame frequency of 82 Hz and is widely used where cascadable LCD expansion is needed. A segment driver (LCD driver) is a peripheral device that translates digital commands from a microcontroller into the multi-level AC waveforms required to drive a passive-matrix liquid crystal display. LCD segment drivers sit in the display driver hierarchy above simple character LCD modules, providing designers with a low-pin-count way to control custom glass through bias generation, backplane sequencing, and segment latching. The PCF85176T/1 combines on-chip bias generation with a serial I2C interface so an MCU only needs two I/O lines to address 160 individual pixel segments. Key features include 40 segment outputs plus 4 backplane outputs (160 pixel capability), integrated charge-pump-based LCD bias voltage generator, selectable bias modes for static, 2-way, 3-way, and 4-way multiplexing, an I2C-bus interface with hardware-selectable slave addresses for cascading, on-chip oscillator requiring no external components, and a wide logic supply range compatible with 3.3 V and 5 V microcontrollers. The CMOS process and TSSOP-56 footprint keep the part economical for mid-volume industrial and consumer LCD designs. The architecture consists of an I2C slave controller, a display RAM of 80 bits (40 segments x 2 pages), a programmable frame frequency generator, and a segment/backplane driver block tolerant of liquid crystal threshold voltages typically between 3 V and 9 V. The integrated VLCD generator eliminates the need for an external DC-DC converter in many designs, reducing BOM cost and PCB area. Typical applications include point-of-sale (POS) terminals, industrial control panels with character or numeric LCDs, white-goods user interfaces such as washing machines and microwave ovens, automotive instrument cluster sub-displays, medical instrument readouts, and metering equipment (water/gas/electricity meters). Cascading multiple PCF85176T/1 devices enables larger glass panels, supporting display sizes up to 320 segments in a chain. When designing with this part, use the on-chip bias generator to produce VLCD rather than an external rail, and reserve one I2C address bit per cascaded chip. Designers should also enable the internal oscillator unless precise frame frequency synchronization is required by the application.

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PCF85263ATT/AJ - Tiny RTC I2C 400kHz, Battery Switch-Over | NXP
PCF85263ATT/AJ

PCF85263ATT/AJ - Tiny RTC I2C 400kHz, Battery Switch-Over | NXP

The NXP Semiconductors PCF85263ATT/AJ is a CMOS Real-Time Clock (RTC) and calendar optimized for ultra-low power consumption with automatic battery switch-over on main power loss, supplied in an 8-pin TSSOP (also called 8-MSOP, 3.00 mm width) package. It communicates through a 400 kHz I2C-bus and integrates three time-log registers, a clock output, two independent alarms, and a timestamp input that records power-down/power-up transitions. Programmable via 16-bit registers, the PCF85263ATT/AJ provides century, year, month, day, weekday, hours, minutes, and seconds with leap-year correction up to the year 2099, making it suitable for long-lifecycle embedded designs. An RTC (Real-Time Clock) is a low-power oscillator-plus-counter peripheral that maintains wall-clock time independently of the host MCU. RTCs are members of the broader timer/clock IC family, which also includes timer ICs and stop-watch counters. In the system hierarchy, an RTC sits beneath power management and above discrete passives, providing a battery-backed time reference for microcontrollers that would otherwise need to keep time via software timers and a separate 32.768 kHz crystal. By integrating the crystal load capacitors, the battery switch-over MOSFET, and the I2C interface into a single IC, the PCF85263ATT/AJ reduces BOM count and PCB area compared to discrete RTC designs. Key features include 4 time-of-day alarms with timestamp, integrated 32.768 kHz crystal load capacitors (12.5 pF), supply voltage range of 0.9 V to 5.5 V with separate battery supply input, low typical current of 0.55 uA at VDD=3.3 V, and an operating temperature range of -40C to +85C. Three time-log registers are triggered by battery switch-over and input-driven events, supporting forensic power-event capture. The device can also be configured as a stop-watch (elapsed time counter), adding flexibility for metering and instrumentation use cases. The PCF85263A architecture uses a low-power 32.768 kHz crystal oscillator with selectable load capacitance, a BCD-based time counter chain, and a power-management block that arbitrates between VDD and the backup battery. The I2C-bus runs up to 400 kHz in fast mode, and the slave address is fixed (per the manufacturer datasheet). The 8-TSSOP footprint (TSSOP-8 / MSOP-8 outline, 3.0 mm body) is pin-compatible with industry-standard RTCs, enabling drop-in PCB reuse. Typical applications include smart metering (electricity, gas, water), IoT battery-powered sensors, industrial data loggers, white goods, point-of-sale terminals, medical portable devices, and any embedded system requiring timekeeping during main-power loss. The wide 0.9 V to 5.5 V supply range lets the same part serve as backup for a coin cell, a supercapacitor, or a rechargeable battery. When designing with this device, place the 32.768 kHz crystal as close to the XIN/XOUT pins as possible, keep the traces short and symmetric, and add a guard ground to minimize noise coupling. The VBACKUP pin requires a series resistor per the manufacturer datasheet when charged by a supercapacitor. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet. Citations are anchored to the NXP PCF85263A datasheet (per the manufacturer datasheet), DigiKey product page, and Mouser product page.

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PCF8562TT/2 - 4x32 I2C LCD Segment Driver | NXP | TSSOP-48
PCF8562TT/2

PCF8562TT/2 - 4x32 I2C LCD Segment Driver | NXP | TSSOP-48

The NXP PCF8562TT/2 is a universal LCD segment driver with 4 backplanes and 32 segments, controlled via the two-line bidirectional I2C-bus, housed in a 48-pin TSSOP (SOT362-1) package. It supports supply voltages of 2.5V, 3.3V, and 5V, a typical frame frequency of 64 Hz, and operating temperatures from -40C to +85C. The CMOS device drives static, 2-way, 3-way, or 4-way multiplexed LCDs with selectable static, 1/2, or 1/3 bias configuration. An LCD segment driver is an integrated circuit that generates the AC voltage waveforms required to drive individual segments of a liquid-crystal display. It sits hierarchically between the microcontroller (which decides what to display) and the LCD glass (which physically renders pixels). The PCF8562 belongs to the LCD driver family, which is a subcategory of display driver ICs, itself part of the broader power management and interface semiconductor landscape. Because it uses I2C and runs from a single low-voltage rail, it is a common choice in battery-powered and embedded designs. Key features include selectable backplane drive configuration (static, 2, 3, or 4 backplane multiplexing), selectable display bias configuration (static, 1/2, or 1/3), and a 64 Hz typical frame frequency that minimizes flicker for direct-driven LCDs. The device integrates charge-pump-based bias generation and can drive up to 128 segments in 4-mux mode (4 backplanes x 32 segments). Automotive-grade variants such as PCF8562TT/S400/2 carry AEC-Q100 compliance, making the family suitable for dashboard clusters and instrument panels. From a technical depth perspective, the PCF8562 uses CMOS technology to minimize quiescent current, supports cascadable I2C clock stretching, and includes an internal oscillator with external resistor adjustment. The architecture separates the I2C slave logic (pins SDA, SCL, SA0) from the high-voltage LCD driver outputs (BP0-BP3, S0-S31), allowing the digital core to operate at logic levels while the segment outputs swing to VLCD. Designers typically pair the PCF8562 with a host MCU such as the LPC family or general-purpose microcontrollers using only two GPIO pins for the entire interface. Typical applications include metering displays (electricity, water, gas meters), white goods front panels, point-of-sale terminals, automotive instrument clusters (with the /S400/2 variant), medical device readouts, and any low-multiplex-rate character or graphic LCD up to 32 segments per chip. Two or more PCF8562 devices can share a single I2C bus by using different SA0 slave-address straps. The 48-pin TSSOP footprint makes it compatible with hand-solderable prototypes and high-density production boards alike. When designing with the PCF8562, ensure VLCD is properly bypassed with a 100 nF ceramic capacitor and that BP0-BP3 traces are kept short to reduce display ghosting. Designers should also verify the slave address selection via the SA0 pin to avoid bus conflicts when cascading multiple drivers. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PCF8563BS/4,118 - 1mA I2C RTC | 400kHz | HVSON-10 | NXP
PCF8563BS/4,118

PCF8563BS/4,118 - 1mA I2C RTC | 400kHz | HVSON-10 | NXP

The NXP PCF8563BS/4,118 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption, providing year, month, day, weekday, hours, minutes, and seconds based on an external 32.768 kHz quartz crystal. Housed in a 10-pin HVSON (3x3 mm, SOT650-1) exposed-pad package, it communicates via a 400 kHz I2C (2-wire) serial interface and operates from a 1.8 V to 5.5 V supply. According to the NXP datasheet, the device integrates a programmable clock output, an interrupt output, and a voltage-low detector in a footprint of approximately 3x3 mm. What is an RTC? A Real-Time Clock is a dedicated integrated circuit that maintains accurate wall-clock time (date and time) independent of the main system processor, typically referenced to a 32.768 kHz quartz crystal. RTCs sit hierarchically as follows: RTC -> clock/calendar IC -> timing device -> mixed-signal IC -> semiconductor. Unlike software-based timekeeping derived from a microcontroller's oscillator, an RTC continues counting while the host MCU is in deep sleep or powered down, making it the standard solution for battery-backed time-of-day tracking. Key features of the PCF8563BS/4,118 include a maximum clock supply current of 1 mA typical at 32 kHz, an integrated I2C slave interface running up to 400 kHz, a programmable square-wave clock output (32.768 kHz, 1024 Hz, 32 Hz, 1 Hz), an open-drain interrupt output, and an on-chip power-on reset plus voltage-low detector. These features let the host MCU wake only on calendar or alarm events, which minimizes total system energy use. The device uses a low-power CMOS architecture with separate oscillator and timing registers, achieving the typical sub-1 microampere backup current needed for coin-cell battery operation. All 16 RTC registers and the 32.768 kHz trimming circuit are accessed over the standard I2C bus at slave address 0x51 (101 0001b), enabling easy drop-in replacement into designs that already use the PCF8563 footprint. Typical applications include battery-backed wall-clock modules for metering and data loggers, timekeeping in IoT sensor nodes, alarm and timer functions in white goods, point-of-sale terminals, and any embedded system requiring calendar accuracy during MCU sleep or power loss. The wide 1.8 V to 5.5 V supply range also makes it suitable for 3.3 V and 5 V microcontroller rails. When designing with the PCF8563, ensure the 32.768 kHz crystal load capacitance matches the oscillator's specified CL (typically 12.5 pF) and add a small decoupling capacitor on VCC. The exposed thermal pad of the HVSON-10 package should be soldered to the ground plane for mechanical stability and improved thermal dissipation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single source for sourcing, selecting, and implementing the PCF8563BS/4,118.

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PCF8563T/5 - I2C Real-Time Clock/Calendar IC | NXP | SOIC-8
PCF8563T/5

PCF8563T/5 - I2C Real-Time Clock/Calendar IC | NXP | SOIC-8

The NXP PCF8563T/5 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption, supplied in an 8-pin SOIC (SOT96-1 / MO-012) surface-mount package. It is accessed through a two-line bidirectional I2C-bus at a maximum clock rate of 400 kbit/s, and features a programmable clock output, an interrupt output, and an integrated voltage-low detector for backup-battery switching. The device operates from a 1.8 V to 5.5 V supply and draws only a fraction of a microampere from the backup cell. What is a Real-Time Clock IC? An RTC is a dedicated timing integrated circuit that maintains accurate wall-clock time (seconds, minutes, hours, day, date, month, year) independent of the host system, typically backed by a small backup cell or supercapacitor. RTCs belong to the broader hierarchy of clock-and-timing ICs, which includes oscillators, PLL synthesizers and timers. Within the timekeeping sub-category, I2C RTCs such as the PCF8563 sit alongside SPI and parallel-interface RTCs, providing battery-backed timekeeping for embedded designs. Key features of the PCF8563T/5 include an integrated 32.768 kHz oscillator (0.0320 MHz reference) that requires only an external quartz crystal, a BCD-coded register map for sub-second resolution free software access, a selectable 32.768 kHz or programmable frequency clock output on CLKOUT, and a low-battery detection flag. The integrated voltage-low detector automatically switches between main supply and backup source without external MOSFETs, simplifying battery-backed designs. The PCF8563 uses a CMOS process with on-chip load capacitors matched to standard 32.768 kHz tuning-fork crystals, eliminating the need for external load caps in most applications. The address-and-data I2C protocol includes automatic register-increment for sequential reads (block read of all time/date registers in one transaction) and a slave address of 0x51 (write) / 0x53 (read) fixed by the part. Typical applications include battery-backed timekeeping in metering equipment, point-of-sale terminals, data loggers, white goods and consumer electronics, industrial controllers requiring timestamps, and any embedded system needing a low-power always-on calendar function. A wide 1.8 V to 5.5 V operating range lets the same part span single-cell Li-ion designs and 5 V industrial buses. When designing with this device, reserve the SDA and SCL pins with proper pull-ups to VCC (typically 4.7 kohm at 400 kHz), and place the 32.768 kHz crystal as close to OSCI/OSCO as possible to minimize stray capacitance. Backup-battery drain is dominated by the oscillator current; check the datasheet's Ibat figure to size your backup source. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet alone.

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PCF8574ADW - 8-Bit 5.5V I2C I/O Expander | Texas Instruments
PCF8574ADW

PCF8574ADW - 8-Bit 5.5V I2C I/O Expander | Texas Instruments

Texas Instruments PCF8574ADW is an 8-bit I2C/SMBus input/output expander operating from 2.5 V to 5.5 V, supporting I2C communication at 100 kHz in a 16-pin SOIC (DW) package. It adds eight quasi-bidirectional I/O ports and an interrupt output to a host controller, reducing the number of GPIO pins required by embedded systems. An I/O expander is an interface IC that extends the input/output capacity of a host such as a microcontroller or application processor. The PCF8574 belongs to the I2C I/O expander hierarchy and uses the two-wire bus for command and status transfers. Eight ports can be individually configured as inputs or outputs, while address pins allow multiple expanders to coexist on the same bus. Key features include eight I/O lines, a 2.5 V to 5.5 V operating range, 100 kHz I2C operation, and an open-drain interrupt output. The interrupt output allows the connected processor to respond when a change occurs on an input port rather than continuously polling all eight lines. The SOIC-16 package supports conventional surface-mount assembly and is available in a -40 °C to +85 °C temperature grade. The PCF8574A architecture uses quasi-bidirectional ports capable of both input and output operation. Each port can be driven low or released high, while an external pull-up resistor is normally required to establish the high state. The three address inputs select one of eight device addresses, allowing several PCF8574 devices to share common SCL and SDA nets. Power-on behavior depends on the external pull-up network and must be considered when defining system defaults. Typical uses include reading control buttons and switches, driving discrete LEDs, monitoring digital status signals, and expanding the GPIO capacity of industrial controllers, test equipment, access-control panels, and compact embedded products. The interrupt line is especially useful in systems where periodic I2C polling would waste processor time or create unnecessary bus activity. Design the interface around the device's open-drain bus architecture. Place pull-up resistors on SDA and SCL close to the bus master, confirm address-strapping levels before enabling the device, and account for the port high-current limitations when driving capacitive or LED loads. The manufacturer datasheet is the controlling reference for pinout, timing, output-current limits, and electrical characteristics.

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PCF8574AN - 8-Bit I/O Expander | Texas Instruments | DIP
PCF8574AN

PCF8574AN - 8-Bit I/O Expander | Texas Instruments | DIP

The Texas Instruments PCF8574AN is an 8-bit remote I/O expander intended for digital input and output expansion in embedded systems. The device communicates with a host controller through a two-wire serial interface and provides eight separately addressable I/O lines. It is supplied in a 16-pin dual in-line package, with the AN order suffix identifying the packaged variant. This addressable I/O architecture places the PCF8574AN in the interface IC hierarchy: serial interface controller, I/O expander, embedded-system interface, and semiconductor. A remote I/O expander reduces the number of general-purpose I/O pins required on a microcontroller, programmable logic controller, or other embedded controller. Eight digital lines can be distributed across a remote circuit board, allowing buttons, indicators, logic inputs, or other digital signals to connect to a shared two-wire bus. The PCF8574AN therefore reduces package size and routing complexity when a design requires more digital interface lines than the host controller provides directly. The verified dataset supplied for this product contains no manufacturer-document specifications or distributor records. Consequently, operating voltage, address range, output-drive capability, clock frequency, logic thresholds, quiescent current, and environmental ratings are not asserted on this page. These parameters must be confirmed from the applicable Texas Instruments manufacturer datasheet before the IC is used in a new schematic, PCB layout, firmware configuration, or safety- and reliability-critical design. The PCF8574AN is typically associated with 5 V and 3.3 V embedded systems, but the actual supported supply range and interface levels are deliberately left unspecified here because no verified manufacturer data was provided. Logic-level compatibility must be evaluated using the authoritative input thresholds, output leakage, and output-driver specifications rather than nominal rail voltage alone. Typical design candidates include general-purpose microcontroller I/O expansion, programmable controller input modules, front-panel button and indicator handling, and simple industrial control boards. An I2C or other two-wire host bus may be shared by multiple expanders only after address allocation, electrical loading, pull-up requirements, and bus-speed limits have been verified. The primary layout concern is the two-wire bus. Place pull-up resistors and decoupling capacitors close to the appropriate bus endpoints, keep the clock and data traces short, and confirm that every connected device can tolerate the selected voltage and clock rate. Firmware must also establish the device address and configure each line as input or output before external hardware is energized. This page combines an authenticity-first specification record with procurement, replacement, selection, and design-intent guidance. Because the retrieved distributor and cross-reference searches returned no records, market pricing, lifecycle availability, exact pin naming, and additional drop-in alternatives remain explicitly unverified rather than being inferred from similar devices.

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PCF8574APW - 8-Bit I2C I/O Expander | Texas Instruments
PCF8574APW

PCF8574APW - 8-Bit I2C I/O Expander | Texas Instruments

Texas Instruments PCF8574APW is an 8-bit I2C/SMBus remote I/O expander with interrupt support, a 2.5 V to 5.5 V operating-voltage range, and a 20-pin TSSOP package. It adds eight quasi-bidirectional port lines to a host microcontroller through a two-wire serial interface, making it useful when a controller has insufficient general-purpose I/O pins. An I/O expander is an interface IC that translates serial bus commands into parallel digital input and output access. The PCF8574A family belongs to the I/O expander category within interface ICs, interface semiconductors, and electronic components. Its remote port can connect to buttons, indicators, logic inputs, control signals, and other digital peripherals while the host processor retains access through the I2C bus. The device provides eight quasi-bidirectional I/O pins, an interrupt output, three hardware address inputs, and operation from 2.5 V to 5.5 V. According to the Texas Instruments PCF8574A product page, the device supports both I2C and SMBus communication. The manufacturer datasheet also identifies a maximum standby-current consumption of 10 microamperes, supporting designs where standby power is an important consideration. The A designation identifies the address-selectable version of the PCF8574 family. Each device offers three address inputs, allowing multiple expanders to share one serial bus when suitable bus addresses are assigned. The interrupt output provides a hardware indication that input-port state has changed, reducing the need for the host controller to poll every port continuously. Typical uses include expanding microcontroller GPIO for human-interface controls, monitoring switches and keypads, driving LEDs or logic-enable signals, controlling discrete system inputs, and supporting industrial interface modules. It can also reduce the number of I/O pins required on a microcontroller, processor, or programmable logic controller. A hardware design should treat the quasi-bidirectional port outputs carefully because each line may be weakly driven high and can be pulled low by an external device. Designers should review the port architecture, address pins, bus pull-up requirements, and interrupt behavior in the manufacturer datasheet before finalizing the circuit. This product page combines the manufacturer electrical characteristics, interface details, application guidance, pin assignment information, and verified substitute analysis. It also highlights the limits of direct replacement: identical pin count and package dimensions alone do not guarantee that two I/O expanders use identical addressing, interrupt, electrical, or qualification behavior.

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PCF8574AT/3,518 - 8-bit I2C I/O Expander | NXP SOIC-16
PCF8574AT/3,518

PCF8574AT/3,518 - 8-bit I2C I/O Expander | NXP SOIC-16

The NXP PCF8574AT/3,518 is an 8-bit I/O expander with quasi-bidirectional I/O pins, an I2C-bus interface operating up to 100 kHz, and an open-drain interrupt output, housed in a 16-pin SO (SOIC-16, MS-013/SOT-162-1) plastic package. It operates from 2.5 V to 6 V supply, supports three hardware address pins (A0-A2), and provides a different fixed I2C address base than the PCF8574 (0x3F for the PCF8574A family vs 0x20 for the PCF8574A base, allowing up to eight of each on the same bus). The CMOS silicon-gate design draws low quiescent current (typ. 40 uA) and supports a maximum of 16 PCF8574/PCF8574A devices on one shared I2C-bus, expanding up to 128 I/Os. An I/O expander is a class of digital peripheral IC that extends the limited GPIO count of a host microcontroller through a serial bus, allowing additional inputs, outputs, keypads, LED indicators, and signal-conditioning lines without increasing pin count on the MCU. Within the hierarchy of interface ICs (also called bus expanders or GPIO extenders), the PCF8574AT belongs to the I2C-bus parallel-port family, positioned between simple shift-register expanders (which lack interrupt capability) and full SPI/I2C port-mapped devices. This category sits under digital logic and interface ICs in broader semiconductor taxonomy, supporting both consumer and industrial designs where MCU pin count is constrained. Key features include quasi-bidirectional I/O that can directly drive LEDs without external pull-ups (sinking capability of up to 25 mA per pin, max 100 mA total), an active-low interrupt output (INT) that signals the host when any input state changes, and 400 kHz Fast-mode I2C capability on the PCF8574A/PCF8574AT family variants. The device integrates a noise filter on the SCL/SDA lines and supports clock stretching as a slave device. The PCF8574AT uses a CMOS silicon-gate architecture with latched output registers and input latches on every I/O pin. The quasi-bidirectional design uses a weak pull-up (typically 100 uA current source) to drive outputs high; pulling low requires the pin to actively sink current. This architecture eliminates the need for external pull-up resistors on outputs while maintaining low standby current. Typical applications include driving LED arrays, LCD segment interfaces, keypad matrix scanning, fan-speed monitoring, relay control boards, and general-purpose I2C slave peripheral expansion in industrial control, consumer electronics, and embedded systems. Engineers commonly pair the PCF8574AT with low-power MCUs (such as the LPC1100 or PIC16F families) to add 8-bit digital I/O over only two signal wires. When designing with this part, note that the quasi-bidirectional I/O pins have an asymmetric drive capability - they source weakly (100 uA) but sink strongly (25 mA per pin). This makes them ideal for LED-driving (sink mode) but less suitable as push-pull signal drivers. Always respect the absolute maximum of 100 mA total current through the VDD/GND pins to avoid latch-up. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, including cross-references for the very similar PCF8574T/3 (different I2C address range).

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PCF8574DW - 8-Bit 100kHz I2C I/O Expander | Texas Instruments
PCF8574DW

PCF8574DW - 8-Bit 100kHz I2C I/O Expander | Texas Instruments

Texas Instruments PCF8574DW is an 8-bit I2C I/O expander with a 100 kHz bus, eight quasi-bidirectional ports, and an interrupt output, supplied in a 16-SOIC package. According to the manufacturer product page, it supports 2.5 V to 5.5 V operation, while the manufacturer datasheet search result describes 2.5 V to 6 V VCC operation. The device adds eight parallel digital lines to a host microcontroller without consuming eight dedicated GPIO pins. An I/O expander is an interface IC that translates serial I2C commands into parallel digital inputs or outputs. The PCF8574 belongs to the parallel-port expansion and I2C interface hierarchy. It uses two bus lines, SCL and SDA, to receive configuration and port-state data from a microcontroller, then presents P0 through P7 as individually controlled digital ports. Its interrupt output allows a host to react when an input condition changes without continuously polling the bus. The principal features include eight I/O ports, a maximum I2C clock frequency of 100 kHz, a 2.5 V to 6 V VCC operating range stated in the datasheet, and low standby-current consumption with a listed maximum standby current of 10 µA. The open-drain interrupt output is compatible with common microcontroller interrupt inputs. The 16-SOIC package is a surface-mount SOIC-16 footprint, and the DWR tape-and-reel ordering code must not be confused with the DW tube ordering code. The quasi-bidirectional port architecture makes the PCF8574 useful for simple control and status signals. A port can be written as an output or sampled as an input, but the electrical behavior and pull-up implementation require care when driving external loads. The interrupt pin provides an event-oriented alternative to periodic reads when one or more input lines change state. Firmware must also verify the device address and bus pull-up arrangement when multiple expanders share the same two-wire bus. Typical applications include keypad and control-panel scanning, relay or solenoid control, LED indication, sensor and switch input aggregation, industrial control modules, and general embedded systems where a microcontroller has too few GPIO pins. The expander is particularly useful when the required signals are simple logic levels and the bus is already present. It is less suitable when high-speed edge-sensitive inputs, high-current output drive, or strong isolation requirements are present. Designers should verify pull-up resistors on SDA and SCL, ensure that all connected devices use compatible voltage levels, and account for total bus capacitance. Port pins intended as inputs should not be forced into incompatible logic states, while output loads should remain within verified current and voltage limits. This page combines the supplied manufacturer and distributor data with practical design guidance, comparison parameters, and sourcing information.

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