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PCA9534DBR - 8-Bit I2C GPIO Expander | Texas Instruments
PCA9534DBR

PCA9534DBR - 8-Bit I2C GPIO Expander | Texas Instruments

Texas Instruments PCA9534DBR is an 8-bit I2C/SMBus general-purpose I/O expander with a 2.3 V to 5.5 V operating supply range, 400 kHz bus support, and a 16-pin SSOP package. It adds eight configurable digital input or output ports to a host processor while retaining control through the two-wire serial bus. The device also includes an interrupt output, configuration registers, and three hardware address pins that allow as many as eight devices to share one bus. An I/O expander is a low-power interface IC used to extend the number of general-purpose input/output lines available to an embedded system. Its hierarchy is GPIO expander, I/O expander, interface IC, and semiconductor. Instead of dedicating eight host-controller pins to each group of inputs and outputs, a system can place the PCA9534DBR on an I2C or SMBus and read or write its ports through register addresses. This is especially useful in compact industrial, consumer, communications, and embedded-control equipment where connector count and PCB area constrain the host MCU. Key features include eight general-purpose I/O ports, programmable addressing through A0, A1, and A2, and an open-drain interrupt output. The official Texas Instruments product information identifies a 2.3 V to 5.5 V VCC range and a 400 kHz I2C bus rate. Independent source information identifies the device as a CMOS 16-pin component and gives an operating temperature range of -40 °C to 85 °C. The SSOP package also makes the part suitable for surface-mount production and PCB footprint reuse where the package is verified against the alternate device. The PCA9534 architecture separates port data from configuration and addressing functions. A0, A1, and A2 hardware pins program the device address, while the serial interface provides access to the input, output, polarity, and configuration registers. The interrupt output allows the host to react when a selected input changes rather than continuously polling every port. Unlike devices with continuously enabled internal input pull-ups, the PCA9534 is noted by NXP as having no internal I/O pull-up resistor, reducing power consumption when outputs are held low; external pull-ups may therefore be required according to the application circuit. Typical uses include remote push-button inputs, LED and relay-control outputs, sensor and switch interfaces, backlight control, and expansion of a host processor's limited GPIO. The 400 kHz bus rate supports routine control traffic rather than high-bandwidth data transfer. Firmware should address each expander through its hardware-configured base address and initialize the configuration and polarity registers before changing port directions. Designers should verify pull-up requirements, address uniqueness, bus capacitance, and interrupt polarity for every connected device. Pull-up resistors should be sized for the lowest operating voltage and the complete bus population. I2C trace length and routing also matter because this low-power expander commonly shares a bus with sensors, EEPROMs, and other peripherals. Software for PCF8574-based designs may require changes when migrating to PCA9534 because the enhanced register behavior is not identical despite hardware compatibility. This product record combines verified manufacturer and distributor information, same-footprint alternatives, application guidance, and design cautions. It also distinguishes genuine pin-compatible choices from devices that only have similar functions, helping engineers shorten replacement evaluation without overlooking firmware and electrical differences.

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PCA9534DW - 8-Bit I2C GPIO Expander | Texas Instruments
PCA9534DW

PCA9534DW - 8-Bit I2C GPIO Expander | Texas Instruments

The Texas Instruments PCA9534DW is an 8-bit I2C/SMBus low-power I/O expander with an interrupt output and configuration registers, operating from 2.3 V to 5.5 V in a 16-SOIC package. It provides eight general-purpose input/output ports, 400 kHz bus operation, power-on reset, and programmable input, output, and high-impedance modes according to the manufacturer product page and PCA9534 datasheet. An I2C I/O expander is a peripheral that adds digital input and output pins to a host controller through a two-wire serial interface. The PCA9534 belongs to the GPIO expander and port-extension hierarchy, where a microcontroller or processor uses serial addressing to control external LEDs, relays, sensors, or digital status signals while reducing direct GPIO requirements. Key features include eight configurable GPIO lines, a 2.3 V to 5.5 V VCC range, 400 kHz I2C/SMBus operation, push-pull outputs, an interrupt output, and configuration registers. The device is identified in distributor data as a 16-SOIC I/O expander. Its low-power design is useful for embedded systems that need additional control or monitoring lines without dedicating eight host-controller pins to every function. The PCA9534 uses configuration registers to determine whether each port pin operates as input, output, or high impedance. The interrupt output provides a hardware indication of input or register conditions, while the I2C interface allows the host to read and update port state. The 400 kHz bus rate supports relatively compact embedded control systems, although actual system throughput depends on bus capacitance, pull-up implementation, and host timing. Typical applications include low-power sensor nodes, industrial control boards, LED or indicator expansion, relay-control interfaces, and general embedded GPIO expansion. In designs using the PCA9534DW, the host processor must provide valid I2C pull-ups, respect the 2.3 V to 5.5 V supply range, and account for the interrupt pin when configuring input-change detection. The 16-SOIC package also requires a PCB footprint matching the SOIC-16 layout. For sourcing, distributor listings provide current market, price, and inventory information, while the manufacturer datasheet remains the controlling reference for pinout, register behavior, electrical limits, and application use. Product availability should be checked directly with an authorized distributor because inventory and pricing change over time.

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PCA9534DWR - 8-Bit I2C GPIO Expander | Texas Instruments (Tape & Reel)
PCA9534DWR

PCA9534DWR - 8-Bit I2C GPIO Expander | Texas Instruments (Tape & Reel)

The Texas Instruments PCA9534DWR is an 8-bit I2C/SMBus low-power I/O expander with an interrupt output and configuration registers, operating from 2.3 V to 5.5 V in a 16-SOIC package. It provides eight general-purpose input/output ports, 400 kHz bus operation, power-on reset, and programmable input, output, and high-impedance modes according to the manufacturer product page and PCA9534 datasheet. An I2C I/O expander is a peripheral that adds digital input and output pins to a host controller through a two-wire serial interface. The PCA9534 belongs to the GPIO expander and port-extension hierarchy, where a microcontroller or processor uses serial addressing to control external LEDs, relays, sensors, or digital status signals while reducing direct GPIO requirements. Key features include eight configurable GPIO lines, a 2.3 V to 5.5 V VCC range, 400 kHz I2C/SMBus operation, push-pull outputs, an interrupt output, and configuration registers. The device is identified in distributor data as a 16-SOIC I/O expander. Its low-power design is useful for embedded systems that need additional control or monitoring lines without dedicating eight host-controller pins to every function. The PCA9534 uses configuration registers to determine whether each port pin operates as input, output, or high impedance. The interrupt output provides a hardware indication of input or register conditions, while the I2C interface allows the host to read and update port state. The 400 kHz bus rate supports relatively compact embedded control systems, although actual system throughput depends on bus capacitance, pull-up implementation, and host timing. Typical applications include low-power sensor nodes, industrial control boards, LED or indicator expansion, relay-control interfaces, and general embedded GPIO expansion. In designs using the PCA9534DWR, the host processor must provide valid I2C pull-ups, respect the 2.3 V to 5.5 V supply range, and account for the interrupt pin when configuring input-change detection. The 16-SOIC package also requires a PCB footprint matching the SOIC-16 layout. For sourcing, distributor listings provide current market, price, and inventory information, while the manufacturer datasheet remains the controlling reference for pinout, register behavior, electrical limits, and application use. Product availability should be checked directly with an authorized distributor because inventory and pricing change over time.

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PCA9534PW - 8-Bit I2C I/O Expander | NXP Semiconductors
PCA9534PW

PCA9534PW - 8-Bit I2C I/O Expander | NXP Semiconductors

The NXP Semiconductors PCA9534PW is an 8-bit CMOS I2C-bus and SMBus low-power I/O port expander with interrupt output, operating from 2.3 V to 5.5 V at up to 400 kHz and housed in a 16-pin TSSOP package. It adds eight configurable GPIO lines while sharing its serial bus with other peripherals. An I/O expander is an interface IC that extends a host microcontroller or processor through a serial bus instead of consuming eight parallel pins. The PCA9534 belongs to the I/O expander hierarchy, expands GPIO resources, and connects through the I2C interface to embedded control systems. Its low-power design is useful when the additional lines must remain available without continuously increasing the power budget. The PCA9534 provides eight general-purpose parallel input or output ports, an interrupt output, and configuration registers. Three hardware address pins, A0, A1, and A2, program the device address and permit multiple expanders on one I2C bus. Its 400 kHz bus capability and 2.3 V to 5.5 V operating range make it suitable for common embedded 3.3 V and 5 V systems. The device is compatible with I2C and SMBus-oriented system architectures and is designed to simplify firmware-controlled expansion of external controls and sensed signals. Inputs and outputs can be configured according to system requirements, while the interrupt output allows a controller to respond when an enabled input changes. The verified product information specifically describes PCA9534PW as the low-power TSSOP16 version of the PCA9554 family, with internal I/O pull-up resistors removed. Typical applications include industrial control boards, sensor interfaces, LED and relay-control boards, compact embedded modules, and small controller platforms that need extra parallel lines without redesigning the host package. The TSSOP-16 package also supports standard surface-mount assembly, although the exact pin names and dimensions must be confirmed in the manufacturer datasheet before layout. Designers should verify address selection, pull-up requirements, voltage compatibility, and interrupt polarity on the assembled PCB. Because the verified material identifies pin and I2C compatibility with PCF8574 while also requiring software changes, firmware should be reviewed when migrating between those devices. This page combines verified NXP, TI, and distributor information with application guidance and sourcing notes.

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PCA9534PWR - 8-Bit I2C I/O Expander | NXP Semiconductors (Tape & Reel)
PCA9534PWR

PCA9534PWR - 8-Bit I2C I/O Expander | NXP Semiconductors (Tape & Reel)

The NXP Semiconductors PCA9534PWR is an 8-bit CMOS I2C-bus and SMBus low-power I/O port expander with interrupt output, operating from 2.3 V to 5.5 V at up to 400 kHz and housed in a 16-pin TSSOP package. It adds eight configurable GPIO lines while sharing its serial bus with other peripherals. An I/O expander is an interface IC that extends a host microcontroller or processor through a serial bus instead of consuming eight parallel pins. The PCA9534 belongs to the I/O expander hierarchy, expands GPIO resources, and connects through the I2C interface to embedded control systems. Its low-power design is useful when the additional lines must remain available without continuously increasing the power budget. The PCA9534 provides eight general-purpose parallel input or output ports, an interrupt output, and configuration registers. Three hardware address pins, A0, A1, and A2, program the device address and permit multiple expanders on one I2C bus. Its 400 kHz bus capability and 2.3 V to 5.5 V operating range make it suitable for common embedded 3.3 V and 5 V systems. The device is compatible with I2C and SMBus-oriented system architectures and is designed to simplify firmware-controlled expansion of external controls and sensed signals. Inputs and outputs can be configured according to system requirements, while the interrupt output allows a controller to respond when an enabled input changes. The verified product information specifically describes PCA9534PWR as the low-power TSSOP16 version of the PCA9554 family, with internal I/O pull-up resistors removed. Typical applications include industrial control boards, sensor interfaces, LED and relay-control boards, compact embedded modules, and small controller platforms that need extra parallel lines without redesigning the host package. The TSSOP-16 package also supports standard surface-mount assembly, although the exact pin names and dimensions must be confirmed in the manufacturer datasheet before layout. Designers should verify address selection, pull-up requirements, voltage compatibility, and interrupt polarity on the assembled PCB. Because the verified material identifies pin and I2C compatibility with PCF8574 while also requiring software changes, firmware should be reviewed when migrating between those devices. This page combines verified NXP, TI, and distributor information with application guidance and sourcing notes.

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PCA9535CD - 16-Bit I2C GPIO Expander | NXP Semiconductors
PCA9535CD

PCA9535CD - 16-Bit I2C GPIO Expander | NXP Semiconductors

The NXP Semiconductors PCA9535CD is a 24-pin CMOS I/O expander that provides 16 general-purpose parallel input/output ports for I2C-bus or SMBus systems. It operates from a 2.3 V to 5.5 V supply, supports I2C clock frequencies up to 400 kHz, and includes an interrupt output for change notification. The device is packaged in a 24-pin SOIC package and is intended to reduce microcontroller pin requirements while adding configurable digital input and output lines. An I/O expander is an interface IC that extends the number of general-purpose digital lines connected to a host controller. The PCA9535 and PCA9535C belong to this low-power CMOS I/O-expander family and were developed for I2C-bus and SMBus applications. Each port pin can operate as an input or output, allowing one serial bus to control multiple discrete signals while reducing the number of package pins required by the host microcontroller. The PCA9535CD supports 16 GPIO lines, a 400 kHz I2C clock, a 2.3 V to 5.5 V operating supply range, and an interrupt mechanism for connected peripherals. Unlike devices fitted with internal I/O pull-up resistors, the PCA9535 omits those pull-ups, reducing power consumption when its output ports are held LOW. External pull-ups can still be added when the connected circuit requires them. Software configuration determines each port's input or output direction. NXP documents the device as pin-to-pin and I2C-address compatible with the PCF8575, although enhancements require software changes described in Application Note AN469. The PCA9535 is also described as identical to the PCA9555 except for removal of the internal I/O pull-up resistor. These relationships make the PCA9535 useful when a design requires the enhanced interrupt behavior and port features of the PCA9535 while retaining compatibility with established software architectures. Typical uses include expanding microcontroller GPIO for LEDs, push buttons, logic-level control signals, and peripheral interface signals. It can also serve industrial, embedded, and communications equipment where a serial-to-parallel expansion is preferable to adding another microcontroller or a larger host package. The interrupt output can provide an efficient way to notify the host of a change at a connected input rather than requiring continuous polling. Designers should confirm the device's I2C address, address pins, interrupt configuration, and external pull-up requirements before finalizing a board. The bus must also remain within the specified 2.3 V to 5.5 V supply range and 400 kHz clock limit. Because the PCA9535 has no internal I/O pull-ups, input leakage, voltage thresholds, and external bus pull-ups must be evaluated together to ensure reliable logic levels. This page combines the verified NXP product information with distributor availability and pricing, strict same-package alternatives, application guidance, and design considerations. The information is intended to help engineers determine compatibility, sourcing, and implementation requirements without treating electrically similar but mechanically different devices as drop-in replacements.

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PCA9535DB - 16-Bit I2C/SMBus GPIO Expander | Texas Instruments
PCA9535DB

PCA9535DB - 16-Bit I2C/SMBus GPIO Expander | Texas Instruments

The Texas Instruments PCA9535DB is a remote 16-bit I2C and SMBus low-power I/O expander with interrupt output and configuration registers, operating from 2.3 V to 5.5 V and supporting I2C/SMBus clock frequencies up to 400 kHz. It is packaged in a 24-pin SSOP and provides 16 general-purpose parallel I/O ports for extending microcontroller and embedded-system interfaces. The device is designed for low-power operation and includes programmable input/output direction control, configuration registers, and an interrupt output for change detection. An I/O expander is an interface IC that adds parallel digital input or output capability to a serial bus system. The PCA9535DB belongs to the I/O expander hierarchy within interface ICs, enabling a host microcontroller to control or monitor multiple lines while reducing the number of host GPIO pins required. Its I2C-compatible interface makes it suitable for systems using embedded processors, industrial controllers, communication equipment, and consumer electronics. The PCA9535 offers 16 I/O pins, 2.3 V to 5.5 V operation, 400 kHz bus support, low standby-current consumption, and a dedicated interrupt output. Each port can be configured as input or output through the device registers, allowing mixed input/output designs on the same expander. The configuration registers also support device-level and port-level control, making the device useful for systems requiring distributed digital I/O. Compared with a microcontroller dedicated to GPIO expansion, the PCA9535DB offloads repetitive parallel I/O handling to a low-power serial peripheral. Its 16-bit architecture reduces the number of external connections, while the interrupt line allows the host to respond to input changes without continuously polling every port. The I2C and SMBus interface also simplifies integration with widely adopted embedded buses. Typical applications include industrial control panels, keypad and LED scanning, remote sensor interfaces, programmable logic controllers, communication modules, and consumer products requiring additional GPIO. The PCA9535DB is particularly useful when a design requires bidirectional digital lines, change notification, or bus-addressed peripheral control. For PCB implementation, place the device close to the supported connector or controlled signal group and route I2C SDA and SCL away from noisy power paths. Confirm the device address configuration and account for pull-up requirements in the complete bus design. This page combines verified manufacturer and distributor information, package details, commercial guidance, practical design notes, and drop-in replacement considerations for engineers evaluating the PCA9535DB.

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PCA9535DBR - 16-Bit I2C I/O Expander | Texas Instruments
PCA9535DBR

PCA9535DBR - 16-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9535DBR is a 16-bit I2C and SMBus remote I/O expander with a 2.3 V to 5.5 V supply range, 400 kHz bus frequency, interrupt output, and configuration registers, housed in a 24-pin SSOP package. It adds 16 general-purpose digital I/O lines to a host microcontroller or processor while keeping the PCB interconnect limited to the two-wire serial bus. An I/O expander is an interface IC that translates serial commands into parallel digital input or output operations. The PCA9535DBR belongs to the I/O expander hierarchy within interface controllers and system interface ICs. Its remote port architecture allows a controller to monitor inputs and control outputs located behind cables, bus isolators, or other serial links, reducing the number of host GPIO pins required on compact industrial, embedded, and communications equipment. The device operates from 2.3 V to 5.5 V and supports I2C and SMBus communication at up to 400 kHz. Sixteen I/O pins can be configured individually as inputs or outputs through configuration registers. An interrupt output provides a change-event indication, while the configuration registers retain port settings. The verified distributor information also identifies a maximum standby current of 1 uA, helping reduce power consumption when the system is inactive. Internally, the PCA9535 consists of two 8-bit I/O port groups connected to the serial interface. Each port provides eight configurable lines, creating a total of 16 I/O resources. The pin-to-pin and I2C address compatibility stated by Texas Instruments relative to the PCF8575 does not mean that existing firmware is always portable, because the enhanced register behavior requires software changes. This distinction is important when planning a replacement or driver migration. Typical uses include remote control panels, industrial automation modules, sensor and relay interfaces, embedded control boards, and communications equipment. The device is particularly useful when a system needs more GPIO lines than the host controller provides or when the controlled signals are physically remote from the processor. The 24-pin SSOP package also makes it practical for compact boards requiring a conventional leaded surface-mount footprint. When designing a circuit, account for the I2C pull-up resistors, bus capacitance, address selection, and the electrical requirements of every attached port. Check that connected loads remain within the device's output-current and absolute-maximum ratings. Although the PCA9535DBR and its alternatives may use related interfaces, firmware must be checked for register-map differences, input polarity, and interrupt behavior before substitution. This product record combines the verified manufacturer and distributor details with package, purchasing, replacement, and application guidance. It is intended to support faster part identification while clearly separating confirmed PCA9535DBR specifications from parameters that still require confirmation from the manufacturer datasheet.

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PCA9535DW - 16-Bit 400kHz I/O Expander | Texas Instruments
PCA9535DW

PCA9535DW - 16-Bit 400kHz I/O Expander | Texas Instruments

The Texas Instruments PCA9535DW is a 16-bit I2C and SMBus low-power I/O expander with a 400 kHz interface, 2.3 V to 5.5 V supply range, interrupt output, and configuration registers, housed in a 24-pin SOIC package. It adds 16 general-purpose digital input or output lines through two serial bus pins, reducing MCU GPIO requirements while preserving a compact 0.295 inch, 7.50 mm wide package. An I/O expander is an interface IC that translates serial I2C or SMBus commands into parallel control and status signals. Within the hierarchy of semiconductor, interface IC, and I/O expander, the PCA9535DW is used when a controller needs more discrete digital lines than its package provides. Each of its 16 ports can be configured independently for input or output, allowing mixed control, monitoring, and status functions on one bus-connected device. The verified device data identifies 16 I/O lines, operation from 2.3 V to 5.5 V, a maximum bus frequency of 400 kHz, and standby-current consumption as low as 1 uA maximum. It also includes an open-drain interrupt output and configuration registers. The interrupt feature lets a controller respond to a change on configured inputs without continuously polling the device, although the exact hardware behavior and setup must follow the manufacturer datasheet. The DW ordering code is associated with a 24-pin SOIC package in the supplied distributor data. Tube packaging is identified for PCA9535DW, while the manufacturer product page remains the authoritative source for ordering, lifecycle, pinout, register behavior, electrical limits, and qualification information. The verified snippets do not provide the full pin-to-pin register map or detailed output-drive specifications, so those values are not inferred here. Typical uses include microcontroller port expansion, industrial control modules, keypad and switch monitoring, relay or indicator control, sensor-interface control, and small embedded systems where I2C connectivity is preferred over dedicating many parallel pins. Designers should account for the device's supply limits, bus pull-up requirements, address configuration, current limits, and input/output mode registers. A key design consideration is that a serial expander does not eliminate electrical loading: external loads must remain within the datasheet limits, bus rise and fall times must be controlled, and any open-drain interrupt line needs appropriate pull-up treatment. The PCA9535DW is best suited to low- and moderate-speed control signaling rather than high-current drive or high-speed peripheral expansion. This product page combines the verified Texas Instruments listing, manufacturer datasheet link, distributor identification, package information, and design-oriented guidance to support component selection and engineering review. Distributor pricing and inventory are not provided as exact current values in the verified data and should therefore be confirmed directly with an authorized distributor before procurement.

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PCA9535DWR - 16-Bit 400kHz I/O Expander | Texas Instruments (Tape & Reel)
PCA9535DWR

PCA9535DWR - 16-Bit 400kHz I/O Expander | Texas Instruments (Tape & Reel)

The Texas Instruments PCA9535DWR is a 16-bit I2C and SMBus low-power I/O expander with a 400 kHz interface, 2.3 V to 5.5 V supply range, interrupt output, and configuration registers, housed in a 24-pin SOIC package. It adds 16 general-purpose digital input or output lines through two serial bus pins, reducing MCU GPIO requirements while preserving a compact 0.295 inch, 7.50 mm wide package. An I/O expander is an interface IC that translates serial I2C or SMBus commands into parallel control and status signals. Within the hierarchy of semiconductor, interface IC, and I/O expander, the PCA9535DWR is used when a controller needs more discrete digital lines than its package provides. Each of its 16 ports can be configured independently for input or output, allowing mixed control, monitoring, and status functions on one bus-connected device. The verified device data identifies 16 I/O lines, operation from 2.3 V to 5.5 V, a maximum bus frequency of 400 kHz, and standby-current consumption as low as 1 uA maximum. It also includes an open-drain interrupt output and configuration registers. The interrupt feature lets a controller respond to a change on configured inputs without continuously polling the device, although the exact hardware behavior and setup must follow the manufacturer datasheet. The DW ordering code is associated with a 24-pin SOIC package in the supplied distributor data. Tube packaging is identified for PCA9535DWR, while the manufacturer product page remains the authoritative source for ordering, lifecycle, pinout, register behavior, electrical limits, and qualification information. The verified snippets do not provide the full pin-to-pin register map or detailed output-drive specifications, so those values are not inferred here. Typical uses include microcontroller port expansion, industrial control modules, keypad and switch monitoring, relay or indicator control, sensor-interface control, and small embedded systems where I2C connectivity is preferred over dedicating many parallel pins. Designers should account for the device's supply limits, bus pull-up requirements, address configuration, current limits, and input/output mode registers. A key design consideration is that a serial expander does not eliminate electrical loading: external loads must remain within the datasheet limits, bus rise and fall times must be controlled, and any open-drain interrupt line needs appropriate pull-up treatment. The PCA9535DWR is best suited to low- and moderate-speed control signaling rather than high-current drive or high-speed peripheral expansion. This product page combines the verified Texas Instruments listing, manufacturer datasheet link, distributor identification, package information, and design-oriented guidance to support component selection and engineering review. Distributor pricing and inventory are not provided as exact current values in the verified data and should therefore be confirmed directly with an authorized distributor before procurement.

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PCA9535PW - 16-Bit I2C GPIO Expander | NXP | TSSOP-24
PCA9535PW

PCA9535PW - 16-Bit I2C GPIO Expander | NXP | TSSOP-24

NXP Semiconductors PCA9535PW is a 16-bit I2C/SMBus general-purpose input/output expander with interrupt output, a 2.3 V to 5.5 V operating-voltage range, and a 400 kHz I2C interface. The device is packaged in a 24-pin TSSOP. It adds 16 configurable digital I/O ports to a host controller while limiting serial-bus traffic through configurable ports, registers, and an interrupt output. An I2C GPIO expander is an interface IC that translates serial commands from a microcontroller into parallel digital inputs or outputs. Within the hierarchy of interface ICs, an I/O expander sits below general-purpose bus controllers and above application-specific port devices. The PCA9535PW is designed for systems where the host processor has too few direct pins for switches, LEDs, sensors, relays, or control signals. Key features include 16 configurable GPIO ports, a 400 kHz I2C interface, interrupt output, configuration registers, and low standby-current consumption. According to the verified component listing, standby current is no more than 1 µA. The PCA9535 also supports low-power operation when I/O ports are held low because it removes the internal I/O pull-up resistors used by the related PCA9555. Technically, the device provides separate input/output and polarity-inversion registers, allowing firmware to reinterpret pins without changing the physical circuit. The PCA9535 is described by NXP as pin-to-pin and I2C-address compatible with the PCF8575, although software changes are required for its enhanced register behavior. It is also described as functionally equivalent to the PCA9555 except for the absence of internal I/O pull-up resistors. Typical applications include industrial control panels, sensor aggregation, LED and switch interfaces, programmable logic controllers, and embedded systems requiring more GPIO than the host controller provides. The interrupt output can indicate a change on an input port without continuous polling, while the 2.3 V to 5.5 V supply range supports both 3.3 V and 5 V systems. Designers should account for the absence of internal I/O pull-ups by adding external resistors wherever open-drain, floating, or high-impedance input behavior is required. Pull-ups are also normally installed on the I2C bus itself. The address pins should be checked against the selected bus voltage and system address map before firmware configuration. This page consolidates the verified manufacturer and distributor information for PCA9535PW, including function, procurement considerations, qualified alternatives, comparison parameters, and practical design guidance that are not presented as one continuous datasheet summary.

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PCA9535PWR - 16-Bit I2C GPIO Expander | NXP | TSSOP-24 (Tape & Reel)
PCA9535PWR

PCA9535PWR - 16-Bit I2C GPIO Expander | NXP | TSSOP-24 (Tape & Reel)

NXP Semiconductors PCA9535PWR is a 16-bit I2C/SMBus general-purpose input/output expander with interrupt output, a 2.3 V to 5.5 V operating-voltage range, and a 400 kHz I2C interface. The device is packaged in a 24-pin TSSOP. It adds 16 configurable digital I/O ports to a host controller while limiting serial-bus traffic through configurable ports, registers, and an interrupt output. An I2C GPIO expander is an interface IC that translates serial commands from a microcontroller into parallel digital inputs or outputs. Within the hierarchy of interface ICs, an I/O expander sits below general-purpose bus controllers and above application-specific port devices. The PCA9535PWR is designed for systems where the host processor has too few direct pins for switches, LEDs, sensors, relays, or control signals. Key features include 16 configurable GPIO ports, a 400 kHz I2C interface, interrupt output, configuration registers, and low standby-current consumption. According to the verified component listing, standby current is no more than 1 µA. The PCA9535 also supports low-power operation when I/O ports are held low because it removes the internal I/O pull-up resistors used by the related PCA9555. Technically, the device provides separate input/output and polarity-inversion registers, allowing firmware to reinterpret pins without changing the physical circuit. The PCA9535 is described by NXP as pin-to-pin and I2C-address compatible with the PCF8575, although software changes are required for its enhanced register behavior. It is also described as functionally equivalent to the PCA9555 except for the absence of internal I/O pull-up resistors. Typical applications include industrial control panels, sensor aggregation, LED and switch interfaces, programmable logic controllers, and embedded systems requiring more GPIO than the host controller provides. The interrupt output can indicate a change on an input port without continuous polling, while the 2.3 V to 5.5 V supply range supports both 3.3 V and 5 V systems. Designers should account for the absence of internal I/O pull-ups by adding external resistors wherever open-drain, floating, or high-impedance input behavior is required. Pull-ups are also normally installed on the I2C bus itself. The address pins should be checked against the selected bus voltage and system address map before firmware configuration. This page consolidates the verified manufacturer and distributor information for PCA9535PWR, including function, procurement considerations, qualified alternatives, comparison parameters, and practical design guidance that are not presented as one continuous datasheet summary.

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PCA9535RGER - 16-Bit I2C/SMBus I/O Expander, 400kHz | TI
PCA9535RGER

PCA9535RGER - 16-Bit I2C/SMBus I/O Expander, 400kHz | TI

The Texas Instruments PCA9535RGER is a 16-bit, I2C/SMBus-compatible GPIO expander that provides 16 general-purpose input/output lines through a two-wire serial interface. Housed in a 24-pin VQFN (RGE) package with exposed thermal pad, the device operates from a 2.3 V to 5.5 V VCC rail and supports clock frequencies up to 400 kHz (Fast Mode). It includes an interrupt output (INT) that signals the host controller when any input state changes, plus separate input and output configuration registers that allow each I/O to be set independently as input or output. An I/O expander is a category of interface IC designed to add GPIO lines to a microcontroller when its native pin count is exhausted. The PCA9535 belongs to the I/O expander family, which is itself a sub-category of interface ICs and ultimately of the broader digital semiconductor hierarchy. By using only two MCU pins (SCL and SDA), the PCA9535 adds 16 additional GPIOs that behave like native port pins, making it indispensable in space-constrained designs. Key features include 5 V tolerant I/O, 25 mA typical sink capability per output (allowing direct LED drive), latched inputs that eliminate spurious interrupts, and a hardware address pin that supports up to eight devices on the same I2C bus (128 total I/Os). The interrupt is cleared by reading the input port register, simplifying firmware. An internal power-on reset initializes all registers to known states. The architecture uses CMOS logic with low standby current consumption, supporting always-on applications. Internal pull-up resistors are not included on the I/O pins, so external resistors are typically required; SCL and SDA must be pulled high externally per I2C bus specification. Typical applications include server backplane management, industrial PLCs and IO-Link modules, gaming consoles, HVAC control boards, and any embedded system requiring extra buttons, LEDs, or relay drivers. The wide voltage range supports both 3.3 V and 5 V MCUs. When designing, ensure SCL/SDA pull-ups are sized correctly for bus capacitance. Multiple PCA9535 devices can share the bus by using different slave addresses (A0/A1/A2). Consider the INT pin behavior - it is active-low and requires a pull-up. This page consolidates distributor pricing, drop-in cross-brand equivalents (NXP PCA9535, onsemi CAT9555), and practical PCB layout notes not always covered in the manufacturer datasheet.

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PCA9536D - 4-Bit I2C GPIO Expander | Texas Instruments
PCA9536D

PCA9536D - 4-Bit I2C GPIO Expander | Texas Instruments

The Texas Instruments PCA9536D is a 4-bit general-purpose input/output expander for I2C-bus and SMBus systems, operating from 2.3 V to 5.5 V with a 400 kHz bus interface in an 8-pin SOIC package. It adds four configurable parallel GPIO lines to a host controller while conserving microcontroller pins. The four ports can operate as inputs or outputs and support configuration, polarity, and output-state registers. An I2C GPIO expander is a semiconductor interface device that extends the number of digital input and output lines available from a host controller. PCA9536-family parts belong to the I/O expander hierarchy, connect through a two-wire I2C or SMBus-compatible interface, and are used for control, sensing, indicators, relays, and low-speed peripheral signaling. The verified product information identifies the PCA9536 as a 4-bit I2C/SMBus I/O expander with a 400 kHz interface. Its 2.3 V to 5.5 V supply range supports both low-voltage embedded systems and conventional 5 V logic environments. The remote four GPIO lines reduce MCU pin count, particularly in compact designs where package area, connector routing, or exposed-pin limitations matter. The PCA9536D uses configuration registers to define port direction and output behavior. Its I2C address is selected by hardware pins according to the manufacturer's datasheet, allowing multiple expanders to coexist on one bus. Bus pull-up resistors, address decoding, and appropriate decoupling should be verified in the final schematic and layout. Typical uses include reading discrete switches, driving LEDs, monitoring external signals, and adding control lines to embedded products. The device is suited to industrial control, consumer electronics, portable equipment, and compact controller boards where a serial bus is already present and four deterministic GPIO lines are needed. Designers should confirm pin orientation, address selection, pull-up placement, and reset or power-up requirements against the manufacturer documentation. Because the verified data does not provide current pricing, detailed electrical limits, pin names, or package drawings, those values are marked for verification rather than inferred.

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PCA9536DG4 - 4-Bit I2C I/O Expander | Texas Instruments
PCA9536DG4

PCA9536DG4 - 4-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9536DG4 is a 4-bit I2C and SMBus remote I/O expander designed for general-purpose input and output expansion in embedded systems. It operates from a 2.3 V to 5.5 V supply, supports I2C communication at up to 400 kHz, and is packaged in an 8-pin SOIC. The device adds four configurable I/O lines to a host controller while keeping the host-side bus access centralized. An I/O expander is an interface IC that converts a serial control bus into additional parallel input or output lines. The PCA9536 belongs to the I2C interface-controller hierarchy and is used when a microcontroller has too few GPIO pins for sensors, switches, indicators, relays, or other external hardware. Its configuration registers allow each port line to be programmed as an input or output, making the device useful in designs where the exact pin direction must be established by firmware. The PCA9536 provides a 2.3 V to 5.5 V operating supply range, I2C/SMBus communication up to 400 kHz, and low standby current, with a maximum standby current of 1 µA. The 8-SOIC package provides a compact surface-mount footprint for applications that need more I/O capacity without adding a large number of individual GPIO connections. The device also supports remote I/O expansion for common microcontroller families through the I2C interface. The PCA9536 uses separate serial clock and serial data lines, SCL and SDA, for communication with the controller. Configuration registers determine whether the four port lines operate as inputs or outputs, while output data registers control the state of output pins. This arrangement allows firmware to scan inputs, update outputs, and implement debounce or device-specific control routines through a shared serial bus. Typical applications include low-pin-count industrial controllers, sensor and relay interface boards, compact consumer devices, LED or switch control systems, and microcontroller designs requiring additional GPIO lines. When using the PCA9536, confirm the controller's I2C address configuration and the intended input or output mode for each port pin. The host system must also account for pull-up requirements and electrical limits when connecting external signals. The main design consideration is bus and I/O planning. Assign addresses and directions consistently across all connected devices, keep external signals within the device's specified limits, and use appropriate pull-up resistors on SCL and SDA. Because the PCA9536DG4 is only an I/O expander, functions such as analog conversion, level shifting, and high-current drive usually require additional components. This product page combines the manufacturer device description with distributor listing information and practical application guidance for engineers evaluating the PCA9536DG4. It also identifies compatible same-package alternatives, summarizes the key register and interface considerations, and highlights where additional external circuitry is needed for complete embedded I/O designs.

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PCA9536DR - 4-Bit I2C GPIO Expander | Texas Instruments (Tape & Reel)
PCA9536DR

PCA9536DR - 4-Bit I2C GPIO Expander | Texas Instruments (Tape & Reel)

The Texas Instruments PCA9536DR is a 4-bit general-purpose input/output expander for I2C-bus and SMBus systems, operating from 2.3 V to 5.5 V with a 400 kHz bus interface in an 8-pin SOIC package. It adds four configurable parallel GPIO lines to a host controller while conserving microcontroller pins. The four ports can operate as inputs or outputs and support configuration, polarity, and output-state registers. An I2C GPIO expander is a semiconductor interface device that extends the number of digital input and output lines available from a host controller. PCA9536-family parts belong to the I/O expander hierarchy, connect through a two-wire I2C or SMBus-compatible interface, and are used for control, sensing, indicators, relays, and low-speed peripheral signaling. The verified product information identifies the PCA9536 as a 4-bit I2C/SMBus I/O expander with a 400 kHz interface. Its 2.3 V to 5.5 V supply range supports both low-voltage embedded systems and conventional 5 V logic environments. The remote four GPIO lines reduce MCU pin count, particularly in compact designs where package area, connector routing, or exposed-pin limitations matter. The PCA9536DR uses configuration registers to define port direction and output behavior. Its I2C address is selected by hardware pins according to the manufacturer's datasheet, allowing multiple expanders to coexist on one bus. Bus pull-up resistors, address decoding, and appropriate decoupling should be verified in the final schematic and layout. Typical uses include reading discrete switches, driving LEDs, monitoring external signals, and adding control lines to embedded products. The device is suited to industrial control, consumer electronics, portable equipment, and compact controller boards where a serial bus is already present and four deterministic GPIO lines are needed. Designers should confirm pin orientation, address selection, pull-up placement, and reset or power-up requirements against the manufacturer documentation. Because the verified data does not provide current pricing, detailed electrical limits, pin names, or package drawings, those values are marked for verification rather than inferred.

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PCA9538APWJ - 8-Bit I/O Expander, 400 kHz | NXP
PCA9538APWJ

PCA9538APWJ - 8-Bit I/O Expander, 400 kHz | NXP

NXP Semiconductors PCA9538APWJ is an 8-bit I2C-bus and SMBus general-purpose input/output expander with interrupt and reset, supporting bus operation up to 400 kHz in a 16-pin TSSOP package. It provides eight configurable remote I/O ports for systems whose microcontroller or processor does not have enough local GPIO pins. The device combines low-voltage operation, serial configuration, and interrupt-driven change reporting in a compact surface-mount package. An I/O expander is an interface IC that extends the number of general-purpose digital inputs and outputs available to a host processor. The I2C interface connects the expander to SCL and SDA, while the eight port pins can operate as inputs or outputs. In the broader semiconductor hierarchy, the PCA9538APWJ is an I/O expander within interface ICs, a peripheral semiconductor, and a serial bus interface device. Principal features include eight I/O ports, I2C and SMBus compatibility, a maximum 400 kHz bus rate, an interrupt output, and an active-low reset input. The interrupt mechanism lets a host detect a change on an input port without continuously polling all eight pins. Reset provides a defined startup state for the port configuration registers and supports deterministic system initialization. The PCA9538A architecture separates serial bus control from parallel port access. The host writes to the configuration and output registers to establish pin direction and output levels, while input data can be read from the corresponding input register. Address and configuration information are managed through the device control registers. This register-based organization allows multiple compatible peripherals to coexist on the same two-wire bus when their addresses differ. Typical uses include remote switch and button inputs, LED or relay-control outputs, sensor-interface connections, and general-purpose digital I/O in embedded products. The interrupt and reset functions are particularly useful in battery-powered and industrial equipment, where event-driven host processing can reduce unnecessary bus activity. The 16-pin TSSOP package also supports compact control boards with conventional surface-mount assembly. Designers should confirm the power rail, pull-up arrangement, address pins, and voltage tolerances before layout release. I2C pull-up resistors must support the bus capacitance and operating speed, while the interrupt and reset traces should remain away from noisy switching nodes. Confirm the pin configuration and electrical limits directly in the NXP datasheet before committing the PCB footprint. This product overview consolidates the device function, interface characteristics, package details, replacement considerations, and practical PCB guidance into an engineering-focused reference for evaluating the PCA9538APWJ in embedded I/O designs.

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PCA9538DB - 8-Bit I2C I/O Expander | Texas Instruments
PCA9538DB

PCA9538DB - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9538DB is an 8-bit I2C and SMBus low-power parallel I/O expander with interrupt output, reset, and configuration registers. Designed for 2.3 V to 5.5 V operation, the device adds eight independently configurable GPIO lines to a host processor while supporting bus speeds up to 400 kHz. It is packaged in a 16-pin SSOP and specified for operation from -40 °C to +85 °C. An I/O expander is an interface IC that converts a serial two-wire bus into additional parallel digital inputs or outputs. In the product hierarchy, the PCA9538DB belongs to the GPIO expander class, within interface ICs and system-level bus expansion devices. This allows a microcontroller or embedded processor to monitor switches, read sensors, control LEDs, drive logic inputs, or detect external events without consuming several dedicated GPIO pins. The PCA9538DB provides an open-drain, active-low interrupt output, allowing connected external hardware to notify the host controller when a programmed input changes. Its reset input establishes a defined operating state, while the configuration registers support input or output operation and polarity control. The verified distributor listing identifies the device as an 8-bit I2C/SMBus expander with a 400 kHz bus rate. Low standby current is a key benefit for compact and low-energy equipment. The device is specified for standby current consumption of 1 µA maximum, making it suitable where the expander must remain connected to a low-power bus but draw minimal current between activity periods. The 2.3 V minimum operating voltage supports both 3.3 V and 5 V system rails, while the 5.5 V maximum accommodates higher-voltage industrial and embedded environments. Typical uses include industrial control panels, programmable LED indicators, keyboard and switch interfaces, sensor aggregation, communication equipment, and compact embedded systems. In these applications, the interrupt line can replace continuous polling for some input events, helping the host controller remain idle between relevant changes. The I2C interface also allows multiple compatible peripheral devices to share the same bus when address configuration and pull-up design are handled correctly. Designers should account for bus pull-up resistors, address pins, logic-level compatibility, and the open-drain interrupt output when allocating PCB resources. The PCA9538DB is offered as a 16-pin SSOP package, while its extended operating-temperature range supports industrial temperature requirements. Pricing and complete electrical limits must be confirmed against current distributor records. This page consolidates manufacturer information, verified distributor listings, package details, application guidance, and honest replacement analysis. It also distinguishes the confirmed same-family upgrade from candidates that cannot satisfy the strict requirement for an identical footprint and pin-to-pin compatibility.

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PCA9538DBR - 8-Bit I2C I/O Expander | Texas Instruments
PCA9538DBR

PCA9538DBR - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9538DBR is an 8-bit I2C and SMBus I/O expander with a 2.3 V to 5.5 V operating supply range, 400 kHz Fast-mode bus support, and a 16-pin SSOP package. It adds eight configurable I/O ports to a host microcontroller without consuming additional direct GPIO pins. The device also provides an interrupt output, reset input, and configuration registers for bus address, input/output direction, and polarity control. An I/O expander is an interface IC that extends the number of digital input and output lines available to an embedded system. The PCA9538 sits between an I2C or SMBus controller and external logic, combining an 8-bit parallel port with serial control. Its hierarchy is I/O expander to interface IC to semiconductor, making it useful when a system needs more GPIO than the host controller can expose directly. The principal features include eight independently configurable I/O lines, operation from 2.3 V to 5.5 V, and I2C communication at up to 400 kHz. Each port register can define pins as inputs or outputs, while the polarity inversion register allows input buffers to be inverted logically. The interrupt output provides a change-detection mechanism that can reduce routine polling by the controller. The PCA9538 uses a two-wire serial interface and address pins that allow multiple expanders to share a bus. Configuration, port, polarity, and interrupt-related registers separate serial bus traffic from the parallel I/O function. This architecture supports bidirectional control of external loads and sensing of external logic states while preserving a compact serial connection to the host processor. Typical uses include industrial control modules, programmable logic controllers, instrumentation, communications equipment, appliance control, and embedded systems requiring additional GPIO. It is especially useful for driving discrete control signals, reading switches or logic levels, and generating an interrupt when an attached external line changes state. Designers should confirm the address configuration and reset behavior in the system power-up sequence. Pull-up requirements for SDA and SCL must follow the datasheet and the voltage level of the connected bus. The operating limits, electrical timing, and absolute maximum ratings should be reviewed before applying the device to a new design. This product record combines verified manufacturer and distributor information, package-level guidance, compatible replacement candidates, and practical design notes. It is intended to accelerate component selection while making the limitations of lifecycle, availability, and pricing data explicit.

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PCA9538DW - 8-Bit I2C I/O Expander | Texas Instruments
PCA9538DW

PCA9538DW - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9538DW is an 8-bit I2C and SMBus I/O expander operating from 2.3 V to 5.5 V, with a maximum bus speed of 400 kHz and a 16-pin SOIC (DW) package. The device adds eight remotely located general-purpose input/output ports to a host microcontroller while providing an interrupt output, reset function, and configuration registers. Its 400 kHz interface speed supports efficient communication with embedded processors in industrial, consumer, communications, and test equipment. An I2C I/O expander is a peripheral interface IC that converts a serial two-wire bus into additional parallel GPIO lines. The I2C interface belongs to the broader serial-interface hierarchy, while the PCA9538 operates at the boundary between a microcontroller and external digital I/O. By using SCL and SDA, a system can reduce direct GPIO pin requirements while retaining individually configurable input or output behavior on P0 through P7. The PCA9538DW combines eight I/O ports, an interrupt output, a reset input, and configuration registers in one low-power device. Its 2.3 V to 5.5 V operating range covers both 3.3 V and 5 V systems. The 400 kHz I2C rate permits frequent register access, while the interrupt output allows a connected processor to respond when a configured input changes rather than polling continuously. The SOIC-16 package is a surface-mount option suitable for conventional PCB assembly. Functionally, the device uses an 8-bit port register for each I/O line and a configuration register that selects input or output operation. According to the NXP-hosted manufacturer datasheet, the PCA9538 is a 16-pin CMOS device designed to provide eight bits of parallel GPIO expansion for I2C-bus and SMBus applications. Interrupt, reset, and configuration registers give the host a structured control interface rather than requiring individual GPIO wiring for every external line. Typical uses include collecting digital switch states, driving discrete alarm or enable signals, expanding a host with limited GPIO, and connecting remote I/O modules over an I2C bus. The PCA9538 is particularly useful when the additional lines are distributed from the main controller or located in a panel or control module. In these arrangements, the interrupt line reduces unnecessary processor activity while the host reads the port register after a change notification. When laying out a PCA9538DW board, route SCL and SDA as a controlled I2C bus and confirm pull-up resistor values against the bus voltage, capacitance, and clock rate. Provide a stable supply near the device and use the reset and interrupt pins according to the system’s startup and wake-up requirements. Although the 2.3 V to 5.5 V range is broad, the entire I2C system must share compatible logic levels. This page combines verified manufacturer and distributor information, pin-level implementation guidance, application fit analysis, and candidate-replacement screening. That engineering context helps distinguish a genuine pin-compatible substitute from a device that merely performs a similar I/O-expansion function or uses a different package.

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PCA9538DWR - 8-Bit I2C I/O Expander | Texas Instruments (Tape & Reel)
PCA9538DWR

PCA9538DWR - 8-Bit I2C I/O Expander | Texas Instruments (Tape & Reel)

The Texas Instruments PCA9538DWR is an 8-bit I2C and SMBus I/O expander operating from 2.3 V to 5.5 V, with a maximum bus speed of 400 kHz and a 16-pin SOIC (DW) package. The device adds eight remotely located general-purpose input/output ports to a host microcontroller while providing an interrupt output, reset function, and configuration registers. Its 400 kHz interface speed supports efficient communication with embedded processors in industrial, consumer, communications, and test equipment. An I2C I/O expander is a peripheral interface IC that converts a serial two-wire bus into additional parallel GPIO lines. The I2C interface belongs to the broader serial-interface hierarchy, while the PCA9538 operates at the boundary between a microcontroller and external digital I/O. By using SCL and SDA, a system can reduce direct GPIO pin requirements while retaining individually configurable input or output behavior on P0 through P7. The PCA9538DWR combines eight I/O ports, an interrupt output, a reset input, and configuration registers in one low-power device. Its 2.3 V to 5.5 V operating range covers both 3.3 V and 5 V systems. The 400 kHz I2C rate permits frequent register access, while the interrupt output allows a connected processor to respond when a configured input changes rather than polling continuously. The SOIC-16 package is a surface-mount option suitable for conventional PCB assembly. Functionally, the device uses an 8-bit port register for each I/O line and a configuration register that selects input or output operation. According to the NXP-hosted manufacturer datasheet, the PCA9538 is a 16-pin CMOS device designed to provide eight bits of parallel GPIO expansion for I2C-bus and SMBus applications. Interrupt, reset, and configuration registers give the host a structured control interface rather than requiring individual GPIO wiring for every external line. Typical uses include collecting digital switch states, driving discrete alarm or enable signals, expanding a host with limited GPIO, and connecting remote I/O modules over an I2C bus. The PCA9538 is particularly useful when the additional lines are distributed from the main controller or located in a panel or control module. In these arrangements, the interrupt line reduces unnecessary processor activity while the host reads the port register after a change notification. When laying out a PCA9538DWR board, route SCL and SDA as a controlled I2C bus and confirm pull-up resistor values against the bus voltage, capacitance, and clock rate. Provide a stable supply near the device and use the reset and interrupt pins according to the system’s startup and wake-up requirements. Although the 2.3 V to 5.5 V range is broad, the entire I2C system must share compatible logic levels. This page combines verified manufacturer and distributor information, pin-level implementation guidance, application fit analysis, and candidate-replacement screening. That engineering context helps distinguish a genuine pin-compatible substitute from a device that merely performs a similar I/O-expansion function or uses a different package.

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PCA9538PW - 8-Bit I2C I/O Expander | NXP | TSSOP-16
PCA9538PW

PCA9538PW - 8-Bit I2C I/O Expander | NXP | TSSOP-16

The NXP Semiconductors PCA9538PW is an 8-bit I2C-bus and SMBus general-purpose I/O expander with interrupt and reset, operating from 2.3 V to 5.5 V in a 16-pin TSSOP package. It adds eight remotely controlled digital input or output ports to a host microcontroller or processor while using the two-wire bus instead of dedicating eight GPIO pins. An I/O expander is an interface IC that extends a system’s digital input/output capability. The PCA9538 belongs to the hierarchy of GPIO expander, serial interface controller, and embedded peripheral. Its registers support configurable input, output, or high-impedance operation, while the interrupt output lets the host respond to selected port events without continuously polling all eight lines. Key features include eight general-purpose I/O lines, 2.3 V to 5.5 V operation, 400 kHz I2C/SMBus support, and dedicated interrupt and reset functions. The low-power design is useful in embedded control, sensor-interface, and power-management systems where a compact serial interface can replace several parallel host-controller pins. The device communicates through the two-line bidirectional bus using SCL and SDA. Its interrupt output provides event signaling, while reset provides a defined initialization path for the port and configuration state. These functions simplify firmware-driven GPIO expansion, particularly when the host must monitor external controls or remotely drive logic-level loads. Typical applications include ACPI power-switch control, sensor and actuator interfacing, push-button and indicator handling, and general embedded GPIO expansion. Designers should account for the selected port direction, pull-up requirements on SDA and SCL, and the electrical characteristics of every signal driven through the expander. For robust PCB implementation, place the serial-bus pull resistors close to the relevant bus nodes and keep the TSSOP routing short and clean. Review address configuration and firmware register access before operation, especially in systems with several I2C peripherals or multiple expanders on the same bus. This page consolidates the verified manufacturer and distributor information, separates confirmed specifications from data gaps, and provides practical design guidance for engineers evaluating PCA9538PW. It also records sourced drop-in alternatives where the available evidence supports pin and package compatibility.

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PCA9538PWR - 8-Bit I2C I/O Expander | NXP | TSSOP-16 (Tape & Reel)
PCA9538PWR

PCA9538PWR - 8-Bit I2C I/O Expander | NXP | TSSOP-16 (Tape & Reel)

The NXP Semiconductors PCA9538PWR is an 8-bit I2C-bus and SMBus general-purpose I/O expander with interrupt and reset, operating from 2.3 V to 5.5 V in a 16-pin TSSOP package. It adds eight remotely controlled digital input or output ports to a host microcontroller or processor while using the two-wire bus instead of dedicating eight GPIO pins. An I/O expander is an interface IC that extends a system’s digital input/output capability. The PCA9538 belongs to the hierarchy of GPIO expander, serial interface controller, and embedded peripheral. Its registers support configurable input, output, or high-impedance operation, while the interrupt output lets the host respond to selected port events without continuously polling all eight lines. Key features include eight general-purpose I/O lines, 2.3 V to 5.5 V operation, 400 kHz I2C/SMBus support, and dedicated interrupt and reset functions. The low-power design is useful in embedded control, sensor-interface, and power-management systems where a compact serial interface can replace several parallel host-controller pins. The device communicates through the two-line bidirectional bus using SCL and SDA. Its interrupt output provides event signaling, while reset provides a defined initialization path for the port and configuration state. These functions simplify firmware-driven GPIO expansion, particularly when the host must monitor external controls or remotely drive logic-level loads. Typical applications include ACPI power-switch control, sensor and actuator interfacing, push-button and indicator handling, and general embedded GPIO expansion. Designers should account for the selected port direction, pull-up requirements on SDA and SCL, and the electrical characteristics of every signal driven through the expander. For robust PCB implementation, place the serial-bus pull resistors close to the relevant bus nodes and keep the TSSOP routing short and clean. Review address configuration and firmware register access before operation, especially in systems with several I2C peripherals or multiple expanders on the same bus. This page consolidates the verified manufacturer and distributor information, separates confirmed specifications from data gaps, and provides practical design guidance for engineers evaluating PCA9538PWR. It also records sourced drop-in alternatives where the available evidence supports pin and package compatibility.

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PCA9539DB - 16-Bit I/O Expander, 2.3-5.5V | Texas Instruments
PCA9539DB

PCA9539DB - 16-Bit I/O Expander, 2.3-5.5V | Texas Instruments

Texas Instruments PCA9539DB is a 16-bit I2C/SMBus low-power I/O expander operating from 2.3 V to 5.5 V, supporting a 400 kHz bus and supplied in a 24-pin SSOP package. It adds 16 general-purpose parallel I/O lines to a host microcontroller through the two-wire serial bus. An I/O expander is an interface IC that extends the usable input/output count of a microcontroller or other embedded processor. It sits in the hierarchy of semiconductor, interface IC, I/O expander, and parallel I/O controller. Rather than requiring a microcontroller to devote many pins to switches, buttons, relays, or indicators, the PCA9539DB transfers those signals over I2C while providing configurable input and output registers. The PCA9539DB provides interrupt, reset, and configuration registers. Its interrupt output is open-drain and active-low, allowing the device to signal a change in an input state without continuous software polling. Maximum standby current is 1 µA, making the device suitable for low-power embedded systems that need additional control lines while minimizing inactive-state consumption. The device connects to a two-wire bidirectional I2C or SMBus interface and operates across a 2.3 V to 5.5 V supply range. This voltage range supports both 3.3 V and 5 V system architectures. The available 400 kHz bus specification provides a practical operating rate for control-oriented peripheral expansion where throughput requirements are modest and deterministic bus behavior is more important than maximum serial bandwidth. Typical uses include expanding GPIO on a compact embedded controller, reading grouped switch or sensor inputs, driving external indicator or relay-control signals, and building a modular peripheral interface around an I2C bus. The active-low open-drain interrupt is particularly useful when the host must sleep between events and wake when an input changes. Designers should account for I2C pull-up resistors, address selection, and the electrical requirements of whichever loads connect to P0 through P15. The PCA9539DB differs from the PCA9555 because it omits the internal I/O pull-up resistors, replaces the A2 address input with RESET, and uses a different address range. This reduced loading can lower power consumption when the I/O lines are held low, but external pull-ups may be required where the application depends on them. This product record consolidates the verified manufacturer and distributor information into an engineering-focused resource covering device function, package data, sourcing links, application context, and practical replacement constraints. Only confirmed drop-in alternatives with the same package and electrical behavior are presented; functional equivalents requiring a different footprint are not mislabeled as drop-in replacements.

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