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PCA9539DBR

PCA9539DBR - 16-Bit I/O Expander | Texas Instruments | 2.3-5.5V

Texas Instruments PCA9539DBR is a 16-bit remote I2C and SMBus low-power I/O expander operating from 2.3 V to 5.5 V, with a 400 kHz bus rate, interrupt output, reset, and configuration registers in a 24-pin SSOP (DB) package. It adds 16 general-purpose input or output lines to a host controller without requiring a parallel GPIO port. An I/O expander is an interface IC that translates serial I2C or SMBus commands into parallel digital input and output signals. The PCA9539 belongs to the I/O expander class, within interface ICs and general-purpose semiconductor devices. Its purpose is to reduce microcontroller pin count while keeping peripheral control and monitoring accessible over a short two-wire serial bus. The PCA9539 provides 16 configurable I/O lines, 2.3 V to 5.5 V operation, and a maximum indicated bus speed of 400 kHz. The device also includes an interrupt output, reset support, and configuration registers. Texas Instruments describes the part as low power, and its operating temperature range is -40 °C to 85 °C for the DB package. Compared with the PCA9555, the PCA9539 removes the internal I/O pull-up resistors, replaces the A2 address input with RESET, and uses a different I2C address range. Removing the internal pull-ups can reduce current consumption when an I/O is held low, but it also requires the board designer to account for external pull-ups when the selected I/O configuration needs them. Typical uses include low-speed control-panel inputs, relay or indicator outputs, sensor and switch monitoring, keyboard-style matrix expansion, and general industrial-control systems. The serial interface is particularly useful when a controller must monitor or drive more discrete lines than its native GPIO count permits. The interrupt output can provide event-driven notification instead of continuous register polling. Designers should verify the complete DB-package pinout against the current manufacturer datasheet before PCB release. I2C bus rise time, pull-up resistance, pull-up voltage, input thresholds, output leakage, and the effect of the RESET pin must be checked in the target system. External pull-ups are particularly important because this variant does not include the PCA9555 family’s internal I/O pull-ups. This page consolidates the verified manufacturer and distributor information for PCA9539DBR, distinguishes the device from superficially similar PCA9555 and TCA9539 families, and identifies which replacement details require datasheet confirmation before a drop-in redesign.

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PCA9539DW

PCA9539DW - 16-Bit 2.3-5.5V I/O Expander | Texas Instruments

The Texas Instruments PCA9539DW is a 16-bit I2C/SMBus I/O expander operating from 2.3 V to 5.5 V at up to 400 kHz, with interrupt, reset, and configuration registers in a 24-pin SOIC (DW) package. It adds 16 general-purpose serial I/O lines to a host microcontroller while minimizing package space and addressing requirements. An I/O expander is an interface IC that converts serial bus commands into parallel input or output signals. In the product hierarchy, the PCA9539 is an I/O expander, interface controller, peripheral IC, and semiconductor. It is especially useful when a microcontroller has too few pins for buttons, LEDs, relays, logic controls, or sensor-enable signals. Its I2C/SMBus connection allows the added lines to be controlled over two shared serial wires. The device provides 16 I/O pins, a 400 kHz bus clock, push-pull output capability, and low current consumption. According to the verified distributor data, output source and sink options include 10 mA and 25 mA configurations. The integrated interrupt output allows a connected processor to react to a change on an input without continuously polling the device, while reset and configuration registers support controlled startup and bus operation. The PCA9539 differs from the PCA9555 because it removes the internal I/O pull-up resistors, replaces address input A2 with RESET, and uses a different address range, as stated on the official TI product page. Removing the internal pull-ups can reduce power consumption when I/O lines remain low. The separate RESET function also provides a hardware reset path, although external pull-up or pull-down requirements must be verified against the complete electrical design. Typical uses include industrial control modules, sensor-interface boards, programmable logic controllers, remote I/O modules, instrumentation, and embedded systems requiring status LEDs, relay controls, or digital-input monitoring. The interrupt line can support efficient event-driven firmware, while the 16 parallel lines reduce the number of host-controller pins needed. Designers should confirm the 2.3 V to 5.5 V supply range, 400 kHz bus limit, I/O voltage levels, current limits, pull-up requirements, and address configuration in the manufacturer datasheet. External pull-ups on SDA and SCL and any required I/O pull resistors should be selected for the bus voltage, capacitance, and system noise environment. The host firmware should also verify register defaults before driving attached loads. This page combines verified manufacturer and distributor information, practical I/O-expander design guidance, and explicit data gaps for parameters not present in the supplied sources.

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PCA9539DWR

PCA9539DWR - 16-Bit 2.3-5.5V I/O Expander | Texas Instruments (Tape & Reel)

The Texas Instruments PCA9539DWR is a 16-bit I2C/SMBus I/O expander operating from 2.3 V to 5.5 V at up to 400 kHz, with interrupt, reset, and configuration registers in a 24-pin SOIC (DW) package. It adds 16 general-purpose serial I/O lines to a host microcontroller while minimizing package space and addressing requirements. An I/O expander is an interface IC that converts serial bus commands into parallel input or output signals. In the product hierarchy, the PCA9539 is an I/O expander, interface controller, peripheral IC, and semiconductor. It is especially useful when a microcontroller has too few pins for buttons, LEDs, relays, logic controls, or sensor-enable signals. Its I2C/SMBus connection allows the added lines to be controlled over two shared serial wires. The device provides 16 I/O pins, a 400 kHz bus clock, push-pull output capability, and low current consumption. According to the verified distributor data, output source and sink options include 10 mA and 25 mA configurations. The integrated interrupt output allows a connected processor to react to a change on an input without continuously polling the device, while reset and configuration registers support controlled startup and bus operation. The PCA9539 differs from the PCA9555 because it removes the internal I/O pull-up resistors, replaces address input A2 with RESET, and uses a different address range, as stated on the official TI product page. Removing the internal pull-ups can reduce power consumption when I/O lines remain low. The separate RESET function also provides a hardware reset path, although external pull-up or pull-down requirements must be verified against the complete electrical design. Typical uses include industrial control modules, sensor-interface boards, programmable logic controllers, remote I/O modules, instrumentation, and embedded systems requiring status LEDs, relay controls, or digital-input monitoring. The interrupt line can support efficient event-driven firmware, while the 16 parallel lines reduce the number of host-controller pins needed. Designers should confirm the 2.3 V to 5.5 V supply range, 400 kHz bus limit, I/O voltage levels, current limits, pull-up requirements, and address configuration in the manufacturer datasheet. External pull-ups on SDA and SCL and any required I/O pull resistors should be selected for the bus voltage, capacitance, and system noise environment. The host firmware should also verify register defaults before driving attached loads. This page combines verified manufacturer and distributor information, practical I/O-expander design guidance, and explicit data gaps for parameters not present in the supplied sources.

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PCA9539PW

PCA9539PW - 16-Bit I/O Expander | NXP Semiconductors

NXP Semiconductors PCA9539PW is a 16-bit general-purpose I/O expander with I2C/SMBus connectivity, interrupt, and reset functions, designed for 2.3 V to 5.5 V operation in a 24-pin TSSOP package. It adds 16 configurable digital lines to a host controller while supporting both input and push-pull output operation. The verified distributor data identifies a 400 kHz bus and describes the device as a low-power remote I/O expander. An I/O expander is an interface IC that converts serial bus commands from a microcontroller or other host into multiple parallel digital signals. In the hierarchy, the PCA9539PW belongs to the I/O-expander class, then interface ICs, then semiconductor devices. Its purpose is to reduce direct GPIO requirements in systems that need many buttons, indicators, sensors, relays, or control lines while retaining a compact serial connection. The main feature set includes 16 general-purpose I/O lines, an interrupt output, reset support, configurable registers, and I2C/SMBus operation. The verified product description identifies the device as a 24-pin CMOS device with 16 GPIO expansion functions. Its 2.3 V to 5.5 V operating range supports both low-voltage and 5 V powered embedded systems, while the 400 kHz interface specification supports common embedded bus speeds. The interrupt and reset functions help the host avoid continuous polling when input lines change. Reset allows the host to initialize the device and its registers reliably, while the interrupt output provides an event indication for input changes. Because the exact pin names, electrical limits, and register details are not included in the supplied verified data, those values are not guessed in this record. Typical applications include ACPI power switches, sensor interfaces, push-button panels, LED indicators, and remote GPIO expansion for microcontrollers. The 16-bit organization makes it useful when a system needs more lines than a typical microcontroller package provides but does not require a large matrix keyboard or very high-current outputs. For PCB design, confirm the 24-pin TSSOP footprint and verify the bus voltage, pull-up requirements, address configuration, and pin mapping against the manufacturer datasheet before release. Do not assume that an electrically similar expander is a true drop-in replacement without checking every pin and electrical parameter. This page combines verified manufacturer and distributor descriptions, explicit data gaps, package information, application guidance, and drop-in replacement screening for the PCA9539PW.

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PCA9539PW/Q900,118

PCA9539PW/Q900,118 - 16-Bit I2C GPIO Expander | NXP

The NXP PCA9539PW/Q900,118 is a 16-bit I2C-bus/SMBus GPIO expander with interrupt output and active-LOW reset, delivering 16 general-purpose I/O lines over a 400 kHz I2C interface in a 24-pin TSSOP (SOT361-1) package. An I/O expander is an interface IC that adds general-purpose input/output pins to a microcontroller or host processor through a serial bus such as I2C or SMBus. In the system hierarchy, it sits between the host MCU and peripheral circuitry - a power-management and interface component that relieves pin-constrained controllers of the burden of driving buttons, LEDs, switches, and sensors directly. Key features include 16 quasi-bidirectional GPIOs with 5 V tolerant I/Os, a polarity inversion register, an active-LOW open-drain interrupt output, and an external RESET pin that restores the default state without a bus power cycle. The /Q900 variant is qualified to AEC-Q100 for automotive applications and operates from 3.0 V to 5.5 V, versus 2.3 V to 5.5 V for the standard PCA9539PW. Architecturally, the PCA9539 is a CMOS slave device with four register pairs (input, output, polarity inversion, configuration) addressed via two hardware address pins A0 and A1, allowing four devices on one bus for up to 64 I/Os. Configuration registers set each pin as input (high-impedance) or output. The interrupt function flags any input state change for fast host polling, avoiding continuous bus reads. Typical applications include automotive body electronics (door modules, lighting control), keypad and switch scanning, LED drive expansion, server backplane monitoring, and industrial PLC I/O cards where MCU pin count is scarce. Design consideration: unused inputs should not be left floating; tie them to a defined level via the internal or external pull-up, and keep the I2C pull-up resistance sized for the 400 kHz bus load capacitance. This page synthesizes distributor pricing, drop-in alternatives from TI, Nexperia, and NXP standard-grade lines, plus design notes not found in the manufacturer datasheet.

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PCA9539PWR

PCA9539PWR - 16-Bit I/O Expander | NXP Semiconductors (Tape & Reel)

NXP Semiconductors PCA9539PWR is a 16-bit general-purpose I/O expander with I2C/SMBus connectivity, interrupt, and reset functions, designed for 2.3 V to 5.5 V operation in a 24-pin TSSOP package. It adds 16 configurable digital lines to a host controller while supporting both input and push-pull output operation. The verified distributor data identifies a 400 kHz bus and describes the device as a low-power remote I/O expander. An I/O expander is an interface IC that converts serial bus commands from a microcontroller or other host into multiple parallel digital signals. In the hierarchy, the PCA9539PWR belongs to the I/O-expander class, then interface ICs, then semiconductor devices. Its purpose is to reduce direct GPIO requirements in systems that need many buttons, indicators, sensors, relays, or control lines while retaining a compact serial connection. The main feature set includes 16 general-purpose I/O lines, an interrupt output, reset support, configurable registers, and I2C/SMBus operation. The verified product description identifies the device as a 24-pin CMOS device with 16 GPIO expansion functions. Its 2.3 V to 5.5 V operating range supports both low-voltage and 5 V powered embedded systems, while the 400 kHz interface specification supports common embedded bus speeds. The interrupt and reset functions help the host avoid continuous polling when input lines change. Reset allows the host to initialize the device and its registers reliably, while the interrupt output provides an event indication for input changes. Because the exact pin names, electrical limits, and register details are not included in the supplied verified data, those values are not guessed in this record. Typical applications include ACPI power switches, sensor interfaces, push-button panels, LED indicators, and remote GPIO expansion for microcontrollers. The 16-bit organization makes it useful when a system needs more lines than a typical microcontroller package provides but does not require a large matrix keyboard or very high-current outputs. For PCB design, confirm the 24-pin TSSOP footprint and verify the bus voltage, pull-up requirements, address configuration, and pin mapping against the manufacturer datasheet before release. Do not assume that an electrically similar expander is a true drop-in replacement without checking every pin and electrical parameter. This page combines verified manufacturer and distributor descriptions, explicit data gaps, package information, application guidance, and drop-in replacement screening for the PCA9539PWR.

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PCA9541APW/01

PCA9541APW/01 - 2-to-1 I2C Master Selector, 16-TSSOP | NXP

The NXP PCA9541APW/01 is a 2-to-1 I2C-bus master selector with interrupt logic and reset, designed for high-reliability dual-master I2C-bus applications where system operation must continue even when one master fails or the controller card is removed for maintenance. It is housed in a 16-pin TSSOP (SOT403-1) package and supports 2 masters sharing a single downstream I2C bus, with channel 0 pre-selected at startup per the /01 variant. A 2-to-1 I2C master selector belongs to the broader family of I2C switches and multiplexers, which are themselves a subcategory of serial interface ICs used for digital inter-chip communication. The PCA9541APW/01 specifically enables bus-arbiter functionality by routing one of two upstream master controllers (e.g., a primary and a redundant back-up) onto a single downstream I2C bus segment. It sits between the master controllers and downstream peripherals, providing arbitration, fault isolation, and hot-swap capability. Key features include two upstream I2C channels (SCL0/SDA0 and SCL1/SDA1), one downstream I2C channel (SCL/SDA), an active-low RESET input, hardware-selectable channel at power-up via a startup mode pin, and bidirectional interrupt logic with separate INT0 and INT1 outputs that report which master currently controls the bus. The downstream INT_IN pin collects fault information from peripherals and propagates it upstream when enabled. The device operates from a supply voltage compatible with common 2.3V-5.5V rails and supports standard-mode and fast-mode I2C signaling. Its low on-resistance pass gates and channel-isolation logic keep bus capacitance low, ensuring clean rise/fall times even with long downstream traces. The PCA9541APW/01 variant pre-selects channel 0 at startup, while the /03 variant leaves no channel selected at startup - selection between /01 and /03 lets system designers tune the power-on behavior. Typical applications include redundant server backplanes with dual master controllers, fault-tolerant telecom equipment, hot-swappable controller cards, and industrial PLC systems where two CPUs arbitrate access to shared I2C peripherals. It is also used in RAID storage controllers and ATCA/AdvancedTCA shelf managers that require seamless master failover. When designing with this part, ensure pull-up resistors are present on the active upstream channel and the downstream bus, and follow the standard I2C impedance guidelines because the pass gates do not include internal pull-ups. Decoupling of VCC with a 100nF ceramic capacitor close to pin 16 is recommended. This page synthesizes verified distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet.

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PCA9541APW/03112

PCA9541APW/03112 - 2-to-1 I²C Master Selector w/ Interrupt | NXP

The NXP PCA9541APW/03,112 is a 2-to-1 I²C-bus master selector with interrupt logic and reset, housed in a 16-pin TSSOP (PW) package. It operates from a supply voltage of 2.3 V to 5.5 V and provides bidirectional switching between two upstream I²C masters and a single downstream I²C bus, allowing either controller to access shared target devices such as EEPROMs, sensors, and ADCs. What is an I²C master selector? An I²C master selector is a type of bus switch that routes a single shared I²C bus between two (or more) upstream controllers. It sits in the I²C signal chain between the controllers (primary and back-up) and the target devices, behaving like a 1-of-2 multiplexer that is itself controlled by the masters over a separate selection line. Master selectors are commonly used for high-reliability redundant-controller applications where continuous operation must be maintained even when one master fails or is removed for maintenance. In the component taxonomy, the part belongs to: I²C switch -> bus switch -> interface IC -> integrated circuit -> semiconductor. Key features of the PCA9541A family include low standby current, integrated interrupt logic, hardware reset input, and wide 2.3 V to 5.5 V supply compatibility that covers both 3.3 V and 5 V rails. The device supports I²C and SMBus operations and provides bus recovery capability, which is critical when one master becomes unresponsive or the I²C bus is stuck low. Two upstream buses (BUS0, BUS1) connect through the selector to a single downstream bus (BUSX), and an external pull-up resistor pulls the open-drain SDAn/SCLn lines high on each side. The PCA9541APW/03,112 architecture centers on a 1-of-2 bidirectional switch realized with pass-gate MOSFETs and an I²C-compatible control interface. Two address-select pins (A0, A1) allow up to four PCA9541A devices to coexist on the same SMBus, enabling a 1-of-4 or 1-of-8 master selection tree. The reset input (/RESET) restores the selector to a defined default state on power-up or when the active-low signal is asserted by a system supervisor. Typical applications include redundant server management on baseboard management controllers (BMCs), telecom equipment with hot-swappable controller cards, fault-tolerant industrial PLCs, and any dual-master I²C architecture where the controller or a daughter card can be removed without disrupting downstream I²C target devices. Designers also use the part to bridge two electrically isolated I²C domains through a controlled switch. When designing with this device, note that both upstream buses require their own pull-up resistors to the selected supply, and the interrupt output is open-drain and must be pulled high at the system-controller side.

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PCA9543AD

PCA9543AD - 2-Channel I2C Switch with Reset | NXP

NXP Semiconductors PCA9543AD is a 2-channel bidirectional I2C-bus switch with interrupt logic and reset, operating from a 2.3 V to 5.5 V supply in a 14-pin SOIC package. It allows one upstream SCL/SDA pair to fan out to two downstream bus pairs, while the programmable control register independently enables either channel or both channels. Two active-low interrupt inputs support change detection on the downstream buses. An I2C-bus switch, also called an I2C multiplexer or I2C switch, is an interface IC that expands one controller-side bus connection into multiple target-side connections. In the product hierarchy, it belongs to the I2C interface-switch class, then to interface ICs, interface semiconductors, and broader semiconductor devices. This allows multiple devices with potentially conflicting addresses to share one physical I2C bus when their downstream ports are enabled selectively. The PCA9543AD provides two bidirectional translating channels compatible with I2C and SMBus systems. Its control register allows the upstream bus to communicate with channel 0, channel 1, or both channels. The device also includes a reset input and separate interrupt inputs for each downstream pair. These functions make it useful where downstream devices generate interrupts, wake a host controller, or must remain disconnected to prevent address conflicts. The switch's operating supply range of 2.3 V to 5.5 V accommodates both 3.3 V and 5 V system rails. Bidirectional communication is fundamental to I2C because the same SDA conductor carries command data from the controller and response data from targets, while SCL carries the clock in both directions. The package is a 14-pin SOIC measuring 0.154 inches, or 3.90 mm, in width, using a surface-mount construction. Typical uses include sensor aggregation, industrial embedded systems, communications equipment, portable electronics, and test or measurement platforms. In a multi-sensor design, the controller can enable one downstream branch at a time, communicate with the selected target, and disable that branch before accessing another device. Interrupt inputs can reduce the need for continuous polling when a downstream peripheral signals an event. Designers should verify the target's supported voltage range, bus capacitance, pull-up arrangement, and channel-isolation behavior against the manufacturer datasheet. Care is also required when connecting downstream buses with different pull-up voltages, because the switch does not inherently translate logic voltage levels. A common pitfall is assuming that a disabled channel provides complete galvanic isolation; it isolates the I2C data path but does not create independently regulated voltage domains. This product page consolidates the verified NXP device description, package information, source links, engineering-oriented application guidance, and explicitly qualified drop-in alternatives. Pricing and lead time remain unverified because the supplied distributor results did not expose numeric values, while alternative selection is limited to same-package devices that can be supported without inventing cross-reference data.

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PCA9543ADR

PCA9543ADR - 2-Channel I2C Switch with Reset | NXP (Tape & Reel)

NXP Semiconductors PCA9543ADR is a 2-channel bidirectional I2C-bus switch with interrupt logic and reset, operating from a 2.3 V to 5.5 V supply in a 14-pin SOIC package. It allows one upstream SCL/SDA pair to fan out to two downstream bus pairs, while the programmable control register independently enables either channel or both channels. Two active-low interrupt inputs support change detection on the downstream buses. An I2C-bus switch, also called an I2C multiplexer or I2C switch, is an interface IC that expands one controller-side bus connection into multiple target-side connections. In the product hierarchy, it belongs to the I2C interface-switch class, then to interface ICs, interface semiconductors, and broader semiconductor devices. This allows multiple devices with potentially conflicting addresses to share one physical I2C bus when their downstream ports are enabled selectively. The PCA9543ADR provides two bidirectional translating channels compatible with I2C and SMBus systems. Its control register allows the upstream bus to communicate with channel 0, channel 1, or both channels. The device also includes a reset input and separate interrupt inputs for each downstream pair. These functions make it useful where downstream devices generate interrupts, wake a host controller, or must remain disconnected to prevent address conflicts. The switch's operating supply range of 2.3 V to 5.5 V accommodates both 3.3 V and 5 V system rails. Bidirectional communication is fundamental to I2C because the same SDA conductor carries command data from the controller and response data from targets, while SCL carries the clock in both directions. The package is a 14-pin SOIC measuring 0.154 inches, or 3.90 mm, in width, using a surface-mount construction. Typical uses include sensor aggregation, industrial embedded systems, communications equipment, portable electronics, and test or measurement platforms. In a multi-sensor design, the controller can enable one downstream branch at a time, communicate with the selected target, and disable that branch before accessing another device. Interrupt inputs can reduce the need for continuous polling when a downstream peripheral signals an event. Designers should verify the target's supported voltage range, bus capacitance, pull-up arrangement, and channel-isolation behavior against the manufacturer datasheet. Care is also required when connecting downstream buses with different pull-up voltages, because the switch does not inherently translate logic voltage levels. A common pitfall is assuming that a disabled channel provides complete galvanic isolation; it isolates the I2C data path but does not create independently regulated voltage domains. This product page consolidates the verified NXP device description, package information, source links, engineering-oriented application guidance, and explicitly qualified drop-in alternatives. Pricing and lead time remain unverified because the supplied distributor results did not expose numeric values, while alternative selection is limited to same-package devices that can be supported without inventing cross-reference data.

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PCA9544AD

PCA9544AD - 4-Channel I2C Multiplexer with Interrupt | NXP

The NXP Semiconductors PCA9544AD is a discontinued 4-channel I2C-bus multiplexer with interrupt logic, packaged in a 20-pin SO package. The device connects one upstream SCL/SDA pair to four downstream SCx/SDx channel pairs, with only one downstream channel selected at a time through a programmable control register. It provides bidirectional translating multiplexed switch control for I2C and SMBus-compatible devices. An I2C-bus multiplexer, also called an I2C switch or channel selector, extends the practical reach of a shared two-wire bus by placing independently selectable devices behind one controller port. The PCA9544A belongs to the translating switch interface class, where the upstream SCL and SDA conductors fan out to four downstream conductors. Only the selected channel passes bus traffic, allowing several peripheral addresses to share one microcontroller or processor I2C port without simultaneous contention. The PCA9544A family includes interrupt logic, allowing downstream devices to request attention without the host repeatedly polling every bus segment. Channel selection and interrupt behavior are handled through the I2C control interface. The verified device information identifies a 2.3 V to 5.5 V operating range, four downstream I2C channels, bidirectional translation, interrupt logic, and a maximum power dissipation of 400 mW for the documented PCA9544APW,112 comparison variant. Typical uses include sensor aggregation, power-management controllers, EEPROMs, real-time-clock devices, and analog front ends that share one host I2C port. The multiplexer is particularly useful when one bus controller must reach four groups of peripherals, especially when the peripherals do not share a single usable address or require isolation to prevent unintended bus activity. Because the NXP product page states that PCA9544AD is no longer manufactured, new production designs should confirm availability and lifecycle status before committing to the footprint. Existing boards can generally preserve the SO-20 land pattern when substituting a verified PCA9544A-family device with matching logic, supply voltage, channel configuration, interrupt polarity, and address-selection behavior. A footprint match alone is not sufficient for a safe replacement. This page consolidates the verified manufacturer description, lifecycle status, distributor references, and documented PCA9544A-family alternatives into an engineering-focused view. It also distinguishes verified electrical facts from parameters that require confirmation against the NXP datasheet, preventing unsupported assumptions during redesign and end-of-life substitution work.

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PCA9545APW

PCA9545APW - 4-Channel I2C Switch with Interrupt | NXP

The NXP Semiconductors PCA9545APW is a 4-channel bidirectional I2C-bus switch with interrupt logic and reset, packaged in a 20-pin TSSOP (PW) package. A single upstream SCL/SDA pair fans out to four downstream SCL/SDA channel pairs, and every channel can be individually enabled or deselected by the contents of the programmable control register. An I2C bus switch (also called an I2C multiplexer or bus router) is a level-transparent pass gate that expands one physical I2C bus into several independent downstream buses. Within the component hierarchy it sits below the system bus controller, above the individual I2C target devices, and belongs to the wider family of interface ICs that manage serial bus arbitration, addressing and clock and data distribution. Key features of the PCA9545A include four independent downstream channel pairs (SC0/SD0 through SC3/SD3), four interrupt inputs INT0 to INT3 with one input per downstream pair, an active-LOW RESET input, and an internal power-on reset function. Any individual channel, or any combination of channels, may be selected. Channel selection and the interrupt and reset behaviour are controlled entirely from the upstream side of the bus. Architecturally the device uses bidirectional translating pass gates between the upstream bus and each downstream channel, so data can flow in either direction on SCL and SDA without level shifting of the logic thresholds themselves. The interrupt inputs allow a host microcontroller to be notified when a downstream target pulls its data line LOW, and the active-LOW reset input lets the system recover a downstream bus that has been held LOW by a stalled or disconnected target. Typical applications include sensor node fan-out where several identical I2C sensors share one host port, interrupt-driven industrial acquisition systems, battery management systems with per-cell current monitors, server and storage module EEPROM sharing, wearable medical monitoring accessories, and multi-channel programmable LED driver control. When laying out the board, remember that each downstream channel is a separate bus segment and therefore needs its own pull-up resistor pair; do not assume the upstream pull-ups will serve all four channels. Tie RESET to a defined level with a pull-up or a host GPIO, and keep the unused channels tied to a defined state so that a floating downstream segment cannot be pulled into an unexpected state during power-up. This page consolidates the NXP product documentation, distributor listings, cross-reference candidates, application patterns and practical layout guidance for the PCA9545APW into a single engineering reference.

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PCA9546AD

PCA9546AD - 4-Ch I2C Switch with Reset, SOIC-16 | NXP

The NXP Semiconductors PCA9546AD is a quad bidirectional translating I2C-bus and SMBus switch with reset function, housed in a 16-pin SOIC (SO16) surface-mount package. It operates from a 2.3V to 5.5V supply, supports bus speeds up to 400 kHz, and fans out one SCL/SDA upstream pair to four downstream SCn/SDn channel pairs selected via a programmable control register. An I2C switch (also called an I2C multiplexer or I2C bus expander) is an interface IC that sits between a master controller and multiple I2C slave buses. It belongs to the broader hierarchy of I2C bus hub devices within the interface IC family, resolving address conflicts and allowing one controller to manage more devices than a single bus can address, while also isolating capacitive loading per segment. Key features of the PCA9546AD include an active-LOW RESET input that recovers the switch to its default state (all channels deselected) if the I2C bus hangs, four selectable or simultaneously selectable channels determined by the writable control register, and pass-gate translation architecture that allows 1.65V-to-5.5V logic-level translation between low-voltage masters and higher-voltage slaves. The pass-gate switch topology keeps the downstream channel capacitance isolated from the upstream bus until a channel is enabled, reducing total bus capacitance and improving rise times. The control register powers up in a known default state, and the RESET pin allows the system master to recover from bus lockup conditions caused by a slave holding SDA low. Typical applications include multiplexing I2C sensors in industrial automation, expanding address space in server and storage backplanes, connecting multiple camera or display modules in consumer electronics, and isolating fault-prone slave segments in automotive body-electronics networks. A critical design consideration: with any channel enabled, the pass-gate series resistance adds to the bus, so keep pull-up resistor values low enough to meet rise-time requirements at 400 kHz, especially with multiple channels enabled simultaneously. This page synthesizes distributor sourcing data, drop-in alternatives including the Texas Instruments PCA9546A equivalent, and practical design notes not found in the manufacturer datasheet. Per the NXP product page, the PCA9546AD is marked End of Life, so lifecycle planning and second-source qualification are strongly recommended.

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PCA9546AD,118

PCA9546AD,118 - 4-Ch I2C Bus Switch Reset | NXP | SOIC-16

The NXP PCA9546AD,118 is a 4-channel bidirectional I2C-bus and SMBus translating switch with active-LOW reset, operating from 2.3 V to 5.5 V supply in a 16-pin SOIC (0.154 in, 3.90 mm width) package. A single SCL/SDA upstream pair fans out to four downstream SCx/SDx channel pairs, selectable individually or in any combination via the programmable control register. An I2C multiplexer (bus switch) is an interface IC that solves address-conflict and bus-capacitance problems in I2C systems. In the interface IC hierarchy (I2C switch -> bus multiplexer -> I2C controller peripheral -> interface IC), it sits between a master controller and multiple I2C slave buses, allowing the master to isolate or connect downstream segments on demand. Multiplexing also lets two devices sharing the same slave address coexist on separate channels. Key features include four bidirectional translating switch channels, I2C and SMBus compatibility, three hardware address pins (A0, A1, A2) allowing up to eight PCA9546A devices on one bus, and an active-LOW RESET input that recovers the switch to the all-channels-deselected state if the bus hangs. On power-up all channels are deselected, guaranteeing a deterministic bus state. Low on-resistance pass-gate switches preserve signal integrity for standard-mode and fast-mode I2C traffic. Architecturally, the PCA9546A uses a write-only control register addressed at one of eight I2C addresses set by the A0-A2 pins; the register byte directly maps bits D0-D3 to channels 0-3. Because the pass-gate switches are bidirectional and voltage-translating, upstream and downstream segments may run at different logic levels within the 2.3-5.5 V supply envelope. Maximum power dissipation is rated at 400 mW. Typical applications include multiple sensor or EEPROM buses in industrial automation, camera and display module selection in consumer electronics, and isolating slow or fault-prone slave devices from a shared system management bus (SMBus/PMBus topologies). Design consideration: place the RESET pin pull-up close to the device and use 1-10 kOhm pull-ups on SDA/SCL per bus segment; note that the control register is write-only and the RESET input is the only hardware recovery path. This page synthesizes distributor pricing, drop-in alternatives, pinout detail, and practical design notes not consolidated in the manufacturer datasheet. Note: the NXP product page lists PCA9546AD as End of Life (EOL); plan second-source qualification accordingly.

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PCA9548ADB

PCA9548ADB - 8-Channel I2C/SMBus Switch | Texas Instruments

The Texas Instruments PCA9548ADB is an 8-channel bidirectional I2C and SMBus translating switch with an active-low reset input, designed for a 2.3 V to 5.5 V operating range in a 24-pin SSOP (DB) package. It provides eight independently selectable downstream clock-and-data channel pairs, hardware addressing through three address pins, and voltage-level translation between the upstream and downstream buses. An I2C switch, also called an I2C multiplexer or bus switch, is an interface IC that routes a shared SCL and SDA connection to one or more downstream peripherals. It belongs to the I2C interface-controller and bus-management hierarchy, where it helps overcome bus-capacitance and address limitations without requiring a separate microcontroller port for every device. The PCA9548A family supports 1-of-8 bidirectional switch selection through the I2C control register. Three hardware address inputs allow as many as eight PCA9548A devices to coexist on the same upstream bus. An active-low reset input provides a hardware recovery path, while the power-up configuration selects all downstream channels according to the device configuration. Voltage translation allows the upstream SCL and SDA signals to operate from a different voltage domain than the selected downstream channel. This makes the device useful when sensors, converters, EEPROMs, and other peripherals use supply rails that differ from the controller bus. The bidirectional switch also supports bus-level clock stretching because SCL and SDA are pass-through paths rather than internally regenerated signals. Typical uses include sensor aggregation, industrial instrumentation, battery-powered portable systems, communications equipment, and embedded computing platforms that need more I2C endpoints than the main controller can support directly. The eight downstream channels reduce wiring complexity by sharing one upstream bus while allowing peripheral groups to remain isolated when they are not selected. When assigning PCB connections, use the pin-description table in the manufacturer datasheet and preserve the common ground connection between every connected supply domain. Keep the upstream bus and selected downstream pair away from unrelated high-current or high-voltage switching nodes. The reset pin should be controlled so a wedged downstream device cannot prevent recovery of the complete bus network. This page combines the manufacturer's product information, verified sourcing records, drop-in replacement analysis, comparison parameters, and practical bus-layout guidance. It is intended to help engineers evaluate the PCA9548ADB as a compact eight-channel I2C/SMBus translation and multiplexing solution.

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PCA9548APW

PCA9548APW - 8-Channel I2C-Bus Switch with Reset | NXP Semiconductors

The NXP Semiconductors PCA9548APW is an 8-channel bidirectional translating I2C-bus switch with reset, controlled via the standard I2C/SMBus interface. The SCL/SDA upstream pair fans out to eight downstream SCx/SDx channel pairs, and any individual channel or combination of channels can be selected via the programmable control register. An active-low RESET input allows the device to recover from a bus-stuck condition, a critical feature in multi-master or hot-swap systems. The device is housed in a 24-pin TSSOP (PW) package rated for -40C to +85C operation. An I2C-bus switch (or multiplexer) is a type of interface IC that sits between a single upstream I2C controller and multiple downstream I2C peripherals, allowing one controller to communicate with several devices that share the same fixed I2C address. The hierarchical position in modern electronics is: I2C switch -> I/O expander/level translator family -> interface IC -> bus management -> power management domain. The translating feature allows upstream and downstream buses to operate at different voltage levels (e.g., 3.3V host with 1.8V or 5V peripherals), eliminating the need for external level shifters. Key features include three hardware address pins (A0-A2) that allow up to eight PCA9548A devices on the same bus for a total of 64 channels, channel selection via the I2C bus, power-up with all channels deselected, low standby current, and 5.5V tolerant I/O. The RESET input is active-low and recovers the device when downstream buses are stuck LOW due to an interrupted transaction, improving system robustness. The device supports standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode-plus (up to 1 MHz, depending on electrical loading). Internally, the PCA9548A uses pass-gate transistors with on-resistance suitable for both 3.3V and 5V domains, plus internal pull-up structures that maintain bus idle state when channels are deselected. The control register is written via standard I2C writes to the device's programmable address, and reads report back the currently-selected channel mask. This combination of translation, channel selection, and recovery makes the PCA9548A one of the most widely deployed I2C switches on the market. Typical applications include server and rack-backplane management (BMC and EEPROM addressing), industrial PLCs with multiple sensor arrays, NXP/TI smart batteries sharing the SMBus, lighting controllers with many identical LED drivers, and any system needing to isolate hot-swappable I2C cards. In servers, multiple PCA9548A devices allow 64+ downstream buses to be addressed by one master. Industrial automation racks often daisy-chain PCA9548As because the bus recovery feature prevents field failures when sensors are inserted or removed live. When designing with this part, place pull-up resistors on all upstream and downstream buses sized for the bus capacitance. Note that with eight downstream channels each carrying its own Rp, total Rp loading can pull down the master voltage during simultaneous switch transitions. Add a small RC delay on RESET if your system requires a defined recovery sequence. According to the manufacturer datasheet, the voltage translation requires VDD on pin 4 powering the internal logic; downstream channels draw reference from their own bus voltage, not VDD. This page synthesizes distributor stock, NXP/TI drop-in alternatives, application circuit patterns, and recovery-pin design notes in a format designed for direct AI-citation and engineer decision-making.

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PCA9554ABS3,118

PCA9554ABS3,118 - 8-bit I2C/SMBus GPIO Expander w/ Interrupt | NXP

The NXP PCA9554ABS3,118 is an 8-bit I/O expander that provides General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications, housed in a 16-pin HVQFN (3x3 mm) package. It operates over a 2.3 V to 5.5 V supply range, supports clock frequencies up to 400 kHz, and features an open-drain interrupt output that asserts when any input state changes. An I/O expander (also called a GPIO expander or port expander) is a type of interface IC that adds parallel digital I/O lines to a microcontroller or processor over a low-pin-count serial bus (typically I2C or SMBus). This category sits within the broader hierarchy: GPIO expander -> I/O expander -> interface IC -> peripheral IC -> integrated circuit (semiconductor). I/O expanders are essential when the host MCU has insufficient GPIO pins for keypad scanning, LED driving, sensor multiplexing, or system status monitoring. Key features of the PCA9554ABS3,118 include 8 individually configurable I/O bits (input or output direction), hardware-selectable I2C addresses (three pins allow up to 8 devices on the same bus), 5 V tolerant I/O, and low standby current. The device conforms to the I2C-bus Fast Mode (400 kHz) specification and integrates a power-on reset circuit that initializes all ports as inputs, simplifying system bring-up. The architecture combines an I2C/SMBus slave interface, a configuration register bank, and bidirectional I/O drivers with weak pull-up enable per pin. The PCA9554A variant (versus the original PCA9554) uses a different default I2C address, allowing PCA9554 and PCA9554A devices to coexist on the same bus. An open-drain /INT pin provides change notification, freeing the host from continuous polling and reducing I2C traffic. Typical applications include mobile phone keypad and slider switch scanning, fan and cooling control in servers, LED driving and blinking control, networking equipment port status indicators, industrial PLC digital I/O expansion, and gaming consoles or set-top box button matrices. The wide 2.3 V to 5.5 V supply range allows direct interfacing with 1.8 V, 3.3 V, and 5 V MCUs without level shifters. When designing with this part, place a 100 nF decoupling capacitor within 5 mm of the VCC pin and keep the SDA/SCL traces short and impedance-controlled. Add external pull-ups (typically 4.7 kohm to 10 kohm) to SDA, SCL, and the open-drain /INT line as required by the I2C standard. Connect the exposed thermal pad to a ground plane for improved thermal and electrical performance. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, providing actionable engineering guidance beyond what distributor catalogs typically publish.

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PCA9554ADB

PCA9554ADB - 8-Bit I2C GPIO Expander | NXP Semiconductors

The NXP Semiconductors PCA9554ADB is an 8-bit I2C and SMBus I/O expander designed for 2.3 V to 5.5 V operation, with an interrupt output and a maximum I2C bus frequency of 400 kHz. The device is offered in a 16-pin SSOP package. Its eight configurable GPIOs can be selected independently as inputs or outputs, while dedicated registers support input polling, output control, polarity inversion, and device configuration. An I/O expander is an interface IC that increases the number of general-purpose input/output pins available to a host controller. In the electronic-component hierarchy, the PCA9554ADB belongs to the I/O expander class, interface ICs, and ultimately semiconductor devices. It communicates with a microcontroller, application processor, or other system controller through the two-wire I2C bus or SMBus, reducing direct GPIO requirements without requiring a parallel peripheral bus. The PCA9554A family provides eight independently configurable ports and an interrupt output. Three hardware address pins, A0, A1, and A2, can program the fixed I2C address and allow as many as eight devices to share one bus. Weak pull-ups are provided for the I2C interface, while configuration, input, output, and polarity-inversion registers make the ports suitable for both sensing and driving external signals. The PCA9554A architecture also provides practical address flexibility for systems containing multiple expanders. The interrupt line allows the host to detect a change on a configured input without continuously polling the input register. Its 2.3 V to 5.5 V supply range supports both 3.3 V and 5 V systems, while the stated 400 kHz bus limit enables comparatively fast communication with the system controller. Typical uses include adding keypad or switch inputs, monitoring discrete sensors, reading LED or relay status, and controlling auxiliary digital signals in embedded equipment. It is particularly useful when the host processor has too few GPIOs for peripheral control or when a modular board requires addressable digital I/O distributed across an I2C bus. Designers should confirm the controller's logic levels, address assignment, pull-up requirements, and startup behavior in the manufacturer datasheet. Software compatibility must also be checked because the PCA9554A is pin-to-pin and I2C-address compatible with the PCF8574A, but its enhanced register architecture requires software changes. This product page combines the verified manufacturer and distributor information for the PCA9554ADB with lifecycle context, replacement guidance, interface explanations, and design-oriented selection notes. Those additions help engineers distinguish hardware compatibility from firmware compatibility and identify whether an existing PCB can be reused during sourcing transitions.

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PCA9554ADBR

PCA9554ADBR - 8-Bit I2C GPIO Expander | NXP Semiconductors (Tape & Reel)

The NXP Semiconductors PCA9554ADBR is an 8-bit I2C and SMBus I/O expander designed for 2.3 V to 5.5 V operation, with an interrupt output and a maximum I2C bus frequency of 400 kHz. The device is offered in a 16-pin SSOP package. Its eight configurable GPIOs can be selected independently as inputs or outputs, while dedicated registers support input polling, output control, polarity inversion, and device configuration. An I/O expander is an interface IC that increases the number of general-purpose input/output pins available to a host controller. In the electronic-component hierarchy, the PCA9554ADBR belongs to the I/O expander class, interface ICs, and ultimately semiconductor devices. It communicates with a microcontroller, application processor, or other system controller through the two-wire I2C bus or SMBus, reducing direct GPIO requirements without requiring a parallel peripheral bus. The PCA9554A family provides eight independently configurable ports and an interrupt output. Three hardware address pins, A0, A1, and A2, can program the fixed I2C address and allow as many as eight devices to share one bus. Weak pull-ups are provided for the I2C interface, while configuration, input, output, and polarity-inversion registers make the ports suitable for both sensing and driving external signals. The PCA9554A architecture also provides practical address flexibility for systems containing multiple expanders. The interrupt line allows the host to detect a change on a configured input without continuously polling the input register. Its 2.3 V to 5.5 V supply range supports both 3.3 V and 5 V systems, while the stated 400 kHz bus limit enables comparatively fast communication with the system controller. Typical uses include adding keypad or switch inputs, monitoring discrete sensors, reading LED or relay status, and controlling auxiliary digital signals in embedded equipment. It is particularly useful when the host processor has too few GPIOs for peripheral control or when a modular board requires addressable digital I/O distributed across an I2C bus. Designers should confirm the controller's logic levels, address assignment, pull-up requirements, and startup behavior in the manufacturer datasheet. Software compatibility must also be checked because the PCA9554A is pin-to-pin and I2C-address compatible with the PCF8574A, but its enhanced register architecture requires software changes. This product page combines the verified manufacturer and distributor information for the PCA9554ADBR with lifecycle context, replacement guidance, interface explanations, and design-oriented selection notes. Those additions help engineers distinguish hardware compatibility from firmware compatibility and identify whether an existing PCB can be reused during sourcing transitions.

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PCA9554ADW

PCA9554ADW - 8-Bit I2C I/O Expander | Texas Instruments

Texas Instruments PCA9554ADW is an 8-bit I2C/SMBus GPIO expander with an operating supply range of 2.3 V to 5.5 V, a maximum bus frequency of 400 kHz, and an open-drain active-low interrupt output. The device is housed in a 16-pin SOIC package and adds eight configurable parallel I/O lines to an embedded system with limited direct GPIO resources. Configuration registers control each port direction, while the weak pull-up feature supports inputs with external pull-up resistors. An I2C I/O expander is a peripheral interface IC that converts a serial I2C or SMBus connection into additional parallel digital inputs and outputs. Its place in the hierarchy is GPIO expander, I/O expander, interface IC, and semiconductor. It reduces microcontroller pin usage while retaining individual control and status reporting for switches, indicators, sensors, and other external circuitry. The PCA9554ADW supports eight I/O ports, three hardware address inputs, interrupt output, port configuration registers, and weak pull-ups. According to the manufacturer datasheet, the A0, A1, and A2 pins permit up to eight devices to share one I2C bus. The interrupt output is open-drain and active low, allowing connected devices to signal a change in input-port state without continuous microcontroller polling. Communication is based on the two-wire I2C interface, with SCL and SDA pins and a stated operating frequency up to 400 kHz. The device supports a 2.3 V to 5.5 V supply range, making it suitable for common embedded rails. Its eight quasi-bidirectional I/O ports can be configured individually as inputs or outputs, while the configuration and polarity registers support bus-oriented control requirements. Typical uses include industrial control modules, sensor-hub boards, LED and switch interfaces, compact data-acquisition equipment, and general-purpose embedded controller platforms. An I2C GPIO expander is especially useful when the host controller has too few pins for external switches, status indicators, isolators, or sensor interfaces. The active-low interrupt path helps conserve processor resources when only occasional input changes occur. PCB implementation requires careful bus layout. Keep SDA and SCL traces short, provide the pull-up network required by the system, and route the interrupt trace away from high-current switching nodes. Confirm address-strapping levels and port directions during firmware initialization, and account for the SOIC package's 16-pin footprint when planning assembly. This page combines interface details, application guidance, pin information, comparison context, and design-focused considerations to support faster component selection and PCB planning. Engineers can use the application sections to identify suitable host-controller arrangements, while the design notes highlight bus, addressing, and interrupt considerations that are important beyond the basic component specifications.

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PCA9554APW

PCA9554APW - 8-Bit I2C GPIO Expander | NXP

NXP Semiconductors PCA9554APW is an 8-bit I2C-bus and SMBus parallel I/O expander with an active-low interrupt output, configurable input or output ports, and a 16-pin TSSOP package. It supports an operating supply range of 2.3 V to 5.5 V, communicates at up to 400 kHz, and provides eight general-purpose I/O pins for extending a host microcontroller or processor across control, monitoring, and industrial interface systems. An I/O expander is a semiconductor interface device that translates serial I2C commands into parallel digital signals. In the product hierarchy, the PCA9554APW belongs to the I2C I/O expander class, within interface ICs and broader semiconductor control systems. Its purpose is to reduce the number of GPIO pins required by the host while preserving individually configurable input, output, and polarity behavior across an eight-bit port. Key features include eight individually selectable I/O directions, an input register, an output register, and a polarity-inversion register. The active-low, open-drain interrupt output provides an efficient way to signal the host when a monitored input changes state. Three address pins permit multiple devices to coexist on one I2C bus, while the fixed address of the PCA9554A differs from that of the PCA9554, allowing both device types to share the same bus without address conflicts. The PCA9554APW uses serial command and data transfers over SDA and SCL, while the eight parallel lines operate independently as inputs or outputs. The operating supply range of 2.3 V to 5.5 V makes the device suitable for systems using 2.5 V, 3.3 V, or 5 V logic. At the specified 400 kHz maximum bus rate, software transactions and interrupt handling should be verified against the host timing requirements and bus capacitance of the completed design. Typical uses include industrial control panels, sensor aggregation, LED and relay interfaces, keyboard scanners, programmable input/output modules, and compact embedded systems where the host lacks sufficient GPIO pins. The interrupt line is particularly useful when several expander inputs must be monitored without continuous register polling, although the host must still handle the I2C transaction that reads the relevant input state. Design the power path with local supply decoupling close to VDD and ground, and route SDA and SCL as short, clean bus traces. Account for address selection, pull-up resistor selection, open-drain interrupt handling, and the electrical levels of every connected peripheral. Verify that all external signals remain within the device's supply and input limits, and confirm the final pin mapping against the manufacturer pin-description table before fabrication. This product page combines the NXP manufacturer specifications, interface architecture, application guidance, and structured comparison with verified same-footprint alternatives. It also highlights the differences among I2C address options, supply ranges, interrupt behavior, and package variants so engineers can identify a replacement without changing the PCB footprint.

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PCA9554D

PCA9554D - 8-Bit I2C/SMBus GPIO Expander | NXP

The NXP Semiconductors PCA9554D is an 8-bit I2C-bus and SMBus general-purpose I/O expander with interrupt, available in a 16-pin SO package. It adds eight configurable GPIO lines to a host processor through the I2C interface, while the interrupt output provides a change indication so the controller does not need to poll continuously. The verified product listing identifies the device as an interface IC for I2C/SMBus I/O expansion and specifically identifies PCA9554D as having a different address from PCA9554A. An 8-bit I/O expander is a peripheral interface device: when a microcontroller lacks sufficient GPIO pins, the expander converts serial I2C transactions into parallel input or output signals. Its place in the hierarchy is I/O expander → bus interface peripheral → interface IC → semiconductor. The PCA9554D can be used to reduce host pin count while adding control, monitoring, and configurable logic connections. The supplied sources describe the device as a 16-pin CMOS part with eight general-purpose I/O lines and an interrupt function, but they do not provide the complete electrical limits, address table, pin names, temperature range, or package dimensions. Those values are therefore marked as data needed rather than inferred. The part is listed by NXP as End of Life, so new designs should verify availability and consider the official replacement information before committing to production. The PCA9554D remains useful for maintaining existing I2C GPIO designs, particularly where 400 kHz I2C operation and SO16 packaging are relevant. Its interrupt feature helps the host respond to external state changes while conserving bus bandwidth. Because the verified sources do not confirm a current manufacturer-recommended drop-in replacement, any alternative must be checked carefully for pin compatibility, address behavior, electrical limits, package dimensions, and lifecycle status.

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PCA9554DB

PCA9554DB - 8-Bit I2C I/O Expander, 5.5V | TI

The Texas Instruments PCA9554DB is an 8-bit I2C/SMBus I/O expander with interrupt, weak pull-ups, and configuration registers, operating from 2.3 V to 5.5 V in a 16-pin SSOP package. According to the verified product listing, it supports I2C/SMBus communication at up to 400 kHz and provides eight general-purpose remote I/O ports. An I/O expander is an interface IC that increases the number of input and output lines available to a microcontroller or other host processor. The PCA9554 belongs to the I2C interface-controller hierarchy: it connects through the two-line bidirectional bus using SCL and SDA, while its eight parallel pins can be configured individually as inputs or outputs. This makes it useful when a system needs remote control, monitoring, or signal-interface expansion without adding a larger microcontroller package. The verified listing identifies weak pull-ups, an interrupt output, and configuration registers as defining features. Configuration registers allow the host to define each port direction and control output states, while the interrupt output provides a change notification mechanism for input events. The 2.3 V to 5.5 V operating range supports both low-voltage and conventional 5 V system rails, subject to the host and bus requirements. The PCA9554DB is identified as a 16-SSOP I/O expander by DigiKey, with an operating bus frequency of 400 kHz. This combination of eight configurable I/O lines, interrupt support, and a compact surface-mount package makes the device suitable for embedded control, remote sensing, keypad or display interfaces, and small automation systems. Designers should confirm the device address, pull-up implementation, electrical limits, and interrupt polarity against the manufacturer datasheet before finalizing a board. The verified data does not provide pin-level naming, output-current limits, or detailed timing values, so those parameters require verification rather than assumption.

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PCA9554DBR

PCA9554DBR - 8-Bit I2C I/O Expander, 5.5V | TI (Tape & Reel)

The Texas Instruments PCA9554DBR is an 8-bit I2C/SMBus I/O expander with interrupt, weak pull-ups, and configuration registers, operating from 2.3 V to 5.5 V in a 16-pin SSOP package. According to the verified product listing, it supports I2C/SMBus communication at up to 400 kHz and provides eight general-purpose remote I/O ports. An I/O expander is an interface IC that increases the number of input and output lines available to a microcontroller or other host processor. The PCA9554 belongs to the I2C interface-controller hierarchy: it connects through the two-line bidirectional bus using SCL and SDA, while its eight parallel pins can be configured individually as inputs or outputs. This makes it useful when a system needs remote control, monitoring, or signal-interface expansion without adding a larger microcontroller package. The verified listing identifies weak pull-ups, an interrupt output, and configuration registers as defining features. Configuration registers allow the host to define each port direction and control output states, while the interrupt output provides a change notification mechanism for input events. The 2.3 V to 5.5 V operating range supports both low-voltage and conventional 5 V system rails, subject to the host and bus requirements. The PCA9554DBR is identified as a 16-SSOP I/O expander by DigiKey, with an operating bus frequency of 400 kHz. This combination of eight configurable I/O lines, interrupt support, and a compact surface-mount package makes the device suitable for embedded control, remote sensing, keypad or display interfaces, and small automation systems. Designers should confirm the device address, pull-up implementation, electrical limits, and interrupt polarity against the manufacturer datasheet before finalizing a board. The verified data does not provide pin-level naming, output-current limits, or detailed timing values, so those parameters require verification rather than assumption.

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PCA9554ADB - 8-Bit I2C GPIO Expander | NXP Semiconductors

PCA9554ADBR - 8-Bit I2C GPIO Expander | NXP Semiconductors (Tape & Reel)

PCA9554ADW - 8-Bit I2C I/O Expander | Texas Instruments

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PCA9554D - 8-Bit I2C/SMBus GPIO Expander | NXP

PCA9554DB - 8-Bit I2C I/O Expander, 5.5V | TI

PCA9554DBR - 8-Bit I2C I/O Expander, 5.5V | TI (Tape & Reel)