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TCA1116PWR - 16-Bit I2C I/O Expander | Texas Instruments
The Texas Instruments TCA1116PWR is a low-voltage 16-bit I2C and SMBus parallel I/O expander with interrupt and reset functions, operating at up to 400 kHz in a 24-pin TSSOP package. Its 16 configurable ports expand a host controller's digital input and output capacity while preserving a compact serial-bus architecture. The device supports 1.65 V to 5.5 V operation, 5 V-tolerant I/O, and 1.8 V I2C operation. An I/O expander is an interface IC that translates serial I2C commands into parallel digital signals. It sits between a microcontroller or other host controller and external switches, sensors, indicators, or logic inputs. The TCA1116PWR belongs to the I/O expander category, the interface IC category, and the broader semiconductor hierarchy. Its purpose is to reduce the number of GPIO pins required by embedded systems while allowing the added ports to be addressed through the I2C bus. Key features include 16 independently usable I/O ports, 400 kHz serial-bus operation, an active-low open-drain interrupt output, and an active-low reset input. The I/O pins tolerate 5 V signals, while the SDA and SCL inputs remain 5 V tolerant during partial power-down with less than 1 uA of leakage even when VCC is zero. These features allow mixed-voltage interfaces and controlled shutdown behavior in compact embedded systems. The TCA1116PWR is designed for systems in which a host needs more parallel lines than its controller provides. Two programming interfaces can address the expander, and its address inputs support placing multiple devices on one bus. The interrupt output allows the controller to avoid continuous polling when a connected peripheral changes state. Reset provides a defined startup state for the ports and helps simplify firmware initialization across a multi-device system. Typical uses include industrial control modules, building-automation interfaces, sensor aggregators, programmable logic controllers, LED and relay monitoring, test equipment, and embedded human-machine interfaces. In a sensor aggregation circuit, the host can configure input ports, read multiple digital signals, and use the interrupt line to request service only when a monitored event occurs. The TCA1116PWR is particularly useful where board area and host-controller pin count are constrained. When laying out the circuit, connect pull-up resistors to the appropriate I2C supply and keep SDA, SCL, and interrupt traces away from noisy switching nodes. Confirm the device address configuration and reset state in firmware, and account for the open-drain nature of the interrupt output when selecting its pull-up network. This page consolidates the device function, interface limits, package details, practical design guidance, and qualified drop-in comparison information to support faster component selection and PCB implementation.
TCA3385-FP Telephone Ring Signal Converter | Motorola
The Motorola TCA3385-FP is a telephone ring signal converter integrated circuit offered in a 16-pin SOG package. Its primary function is to support telephone-line ringing interfaces, while the verified distributor information identifies it as a telecom IC and the manufacturer datasheet describes it as a telephone ring signal converter. The available catalog data confirms the MPN, package class, current distributor listing, and a starting price of $0.6525 as of 2026-10-29. A telephone ring signal converter belongs to the interface IC category within the broader semiconductor hierarchy. Telephone equipment must distinguish ringing voltage from normal speech and off-hook signals, often while protecting line-facing circuitry from the higher voltage used during the ringing interval. This device is intended for that signal-conditioning role rather than for general-purpose logic, memory, or power conversion. Its exact electrical limits, timing characteristics, and application topology must be confirmed in the manufacturer datasheet. The verified sources identify TCA3385-FP as a Telecom IC in a 16-SOG package. LCSC lists the component as in stock with a starting price of $0.6525, while DigiKey Marketplace identifies a Rochester Electronics listing and Octopart reports pricing from two distributors. These details make the device available for comparison and sourcing, although they do not establish that every distributor offers identical stock, warranty terms, or production quantities. Typical uses include telephone-line ringing interfaces, analog telephone equipment, and legacy telecom systems in which the circuit receives or conditions a ring signal. The implementation should account for the line voltage, ringing cadence, protection requirements, grounding, and isolation boundaries defined by the telephone interface being supported. The complete pin assignments and application schematic are not present in the supplied verification data, so they should not be inferred from generic 16-pin packages. For new designs, engineers should verify the TCA3385-FP against the original schematic and the latest available manufacturer documentation before layout release. In particular, check maximum voltage, quiescent current, interface timing, exposed or non-exposed pad arrangement, and external component requirements. Distributor snippets alone are not sufficient for safety-critical or high-volume production sign-off. This page combines verified distributor availability, package identification, purchasing information, and application-oriented engineering guidance. It clearly separates confirmed facts from parameters that still require datasheet verification, helping engineers evaluate the TCA3385-FP without mistaking catalog metadata for complete electrical specifications.
TCA355GXK - Capacitive Touch Proximity Sensor | Infineon
Infineon Technologies TCA355GXK is a capacitive touch proximity sensor integrated circuit offered in an 8-pin SOIC package. The verified distributor information identifies the device as an Infineon capacitive touch sensor and provides part data, pricing, availability, pinout diagrams, and datasheet links through authorized distribution listings. Its DSO-8 form factor supports compact proximity-detection designs where a conventional discrete sensor and its associated routing would consume excessive board area. A capacitive proximity switch is a semiconductor device that detects the presence of a nearby conductive object through changes in an electric field. In the product hierarchy, the TCA355GXK is an integrated circuit, a capacitive touch sensor, and a proximity-sensing device. Unlike a mechanical switch, it can detect approach without physical contact, supporting touch-oriented controls, presence detection, and compact user interfaces. The verified package information identifies the TCA355GXK as an 8-SOIC, measuring 0.154 inch or 3.90 mm in width. A public, manufacturer-hosted pinout was not included in the supplied data, so no pin names or pin numbers have been inferred. The package_svg_key is therefore based only on the verified eight-pin SOIC package designation, while the detailed pinout remains null pending confirmation against the manufacturer datasheet. Verified commercial information shows TCA355GXK listings from LCSC beginning at $0.7758, an icDirectory listing at $1.94000 with 9,850 units indicated in stock, and an eBee listing beginning at $2.4325. Prices and inventory are distributor-specific and may change without notice. Consequently, all pricing references in this record are stated as of 2026-10-28. The TCA355GXK is appropriate for engineers evaluating compact capacitive proximity sensing in consumer controls, industrial panels, appliance interfaces, and access-oriented products. Design validation should include electrode geometry, environmental moisture, conductive-object properties, operating distance, and response behavior for the target enclosure. Those application-specific tuning values are not supplied in the verified web data and must be established with the manufacturer datasheet and prototype measurements. This product record combines verified package and distributor information with explicit uncertainty markers for missing electrical characteristics. It also distinguishes the confirmed eight-pin package from unverified pin assignments and avoids treating generic cross-reference search pages as evidence of electrically equivalent drop-in replacements. Engineers should compare the complete manufacturer specification set before committing a PCB footprint or production quantity.
TCA39306DCURQ1 - Dual I2C/I3C Level Translator 12.5MHz | TI
The Texas Instruments TCA39306DCURQ1 is an automotive-qualified dual bidirectional voltage-level translator compatible with I2C, SMBus, and I3C buses, featuring an enable (EN) input and packaged in an 8-pin VSSOP (DCU) surface-mount package. It supports VREF1 from 0.9V to 3.3V and VREF2 from 1.8V to 5.5V, enabling bidirectional voltage translation between 0.85V and 5V rails without a direction pin, with a maximum data rate of 12.5MHz. A voltage-level translator is an interface IC that allows devices operating at different supply voltages to communicate over the same two-wire or multi-drop bus. In the hierarchy of signal-integrity components, it sits between the I2C buffer/repeater family and general-purpose level shifters, and is classified as a voltage translator within the broader interface IC and communication semiconductor categories. Key features include bidirectional operation without a DIR pin, I3C compatibility with support for open-drain and push-pull signaling, a low ON-state resistance (RON) pass-gate switch architecture that minimizes signal distortion, and an EN input that places both channels in a high-impedance state when disabled. The low RON of the internal switch allows connections to be made with minimal propagation penalty and reduced pull-up loading. Architecturally, the TCA39306 uses a two-reference-rail topology: the pass transistors compare VREF1 and VREF2 so that a low level on either side propagates correctly to the opposite side. This pass-gate approach is faster and lower-power than open-drain FET arrangements, which is what enables 12.5MHz (Fast-mode Plus and I3C-class) operation. Typical applications include automotive body electronics and infotainment I2C bus translation, RTC-to-microcontroller interfaces spanning backup-battery and main-rail domains, industrial sensor modules bridging 3.3V MCUs to 5V peripherals, and I3C sensor hubs. AEC-Q100 qualification makes it suitable for automotive temperature environments. Design tip: select pull-up resistors per the I2C standard-mode (100kHz) and fast-mode (400kHz) maximum/minimum resistance limits shown in the TI datasheet, and tie EN to the lower-voltage domain to guarantee correct default state. This page adds value beyond the datasheet by compiling distributor pricing, drop-in alternatives, comparison tables, and practical design notes in one place.
TCA4311ADR - 2.7-5.5V I2C/SMBus Buffer | Texas Instruments
The Texas Instruments TCA4311ADR is a 2-bit bidirectional hot-swappable I2C/SMBus buffer operating from 2.7 V to 5.5 V, supporting bus frequencies up to 400 kHz in an 8-pin SOIC package. It buffers the SDA and SCL lines, increases bus fanout, and uses 1 V precharge on SDA and SCL to reduce corruption during live connections. The device is specified for temperatures from -40 °C to +85 °C. An I2C buffer, also called a bus buffer or bus repeater, is an interface IC placed between two bus segments. It reproduces the SDA and SCL signals in both directions so that bus capacitance, voltage-level differences, and long interconnect sections can be managed more effectively. In the broader hierarchy, the TCA4311ADR belongs to the I2C interface-controller, bus-buffer, interface-IC, and semiconductor categories. The principal features include bidirectional operation on both SDA and SCL, a 2.7 V to 5.5 V operating-power-supply range, and support for I2C/SMBus signaling at up to 400 kHz. Hot-swappable operation addresses systems in which a peripheral may be connected or disconnected while the bus remains active. The 1 V precharge feature helps limit signal corruption during those live insertion and removal events. The TCA4311ADR contains separate buffered paths for SDA and SCL, allowing two-wire bus segments to be isolated with respect to signal propagation and bus loading. Its 8-pin SOIC package is intended for surface-mount assembly. Because the device operates bidirectionally, the SDA and SCL connections must remain correctly terminated and must not introduce additional pull-up paths that exceed the design limits of the bus. Typical uses include hot-pluggable I2C peripherals, bus-isolation and level-translation interfaces, removable sensor modules, card-edge connections, and systems where one bus segment must connect to another without directly loading the entire bus. The 400 kHz operating limit also makes the device appropriate for standard fast-mode I2C equipment, including sensors, EEPROMs, and low-to-medium-rate control peripherals. Designers should account for the hot-swap path, external pull-up resistors, bus capacitance, and the voltage applied to each side of the buffer. Verify signal rise times at the intended bus frequency and ensure that powered-off or disconnected modules cannot back-power either bus segment. The manufacturer pin-description table should be used when assigning tracks and checking pull-up placement. This page combines the manufacturer product information, exact ordering information, supported operating limits, and cross-reference findings into a design-focused overview. It also identifies the limits of available replacement data so engineers can distinguish confirmed package and family options from candidates that still require independent pin-level and timing validation.
TCA4311D - 2.7-5.5V Hot-Swappable I2C Buffer | TI
The Texas Instruments TCA4311D is a 2-bit bidirectional, hot-swappable I2C/SMBus bus buffer operating from 2.7 V to 5.5 V at up to 400 kHz, and it is packaged in an 8-pin SOIC. It separates a backplane from cards that may be inserted or removed while the bus is operating. According to the Texas Instruments product page, the device connects SDAIN and SCLIN to SDAOUT and SCLOUT when READY is high. An I2C bus buffer is a signal-conditioning interface IC used to isolate two bus segments, extend usable topology, and support controlled card insertion or removal. In the device hierarchy, this function belongs to interface ICs and specifically to bidirectional bus buffers, repeaters, and accelerators. The TCA4311D supports both I2C and SMBus-style two-wire systems, where data and clock lines require buffering rather than unidirectional level translation. Verified headline features include a 2.7 V to 5.5 V operating range, 400 kHz operation, bidirectional signal paths, hot-swappable bus isolation, an enable control, and an open-drain READY output. The READY output indicates that the backplane and card sides are connected together. When EN is high, normal operation resumes; setting EN low places the device into shutdown mode while the I2C bus is idle. The I2C specification cited by Texas Instruments permits up to 400 pF maximum bus capacitance, which can constrain practical bus length. The SMBus specification does not impose that capacitance restriction, although connected-device impedances still limit how quickly the system can meet rise-time and fall-time requirements. Designers should therefore evaluate board capacitance, wiring, pull-ups, and connected-device loading rather than treating buffer insertion as a universal cure for bus-loading problems. Typical uses include server and desktop backplanes, plug-in acquisition modules, industrial control cards, communications equipment, and embedded systems where a card connects to an always-powered bus. The buffer is placed between the backplane pins and card-side pins, preserving independent local behavior on each side. System designers should verify idle-bus shutdown sequencing and interpret READY correctly before enabling the card interface. PCB layout should keep SDA and SCL routing compact, preserve the intended pull-up arrangement on each bus side, and provide the decoupling and grounding required by the manufacturer datasheet. Because the verified material does not expose complete electrical timing, current, capacitance, and pin-level limits in the supplied text, those values remain marked for data completion rather than being inferred. This page combines verified manufacturer and distributor information with design guidance, replacement analysis, and practical procurement context. It also distinguishes true pin-compatible alternatives from packaging-only orderable variants, helping engineers make evidence-based interface decisions.
TCA4311DR - 2.7-5.5V Hot-Swappable I2C Buffer | TI (Tape & Reel)
The Texas Instruments TCA4311DR is a 2-bit bidirectional, hot-swappable I2C/SMBus bus buffer operating from 2.7 V to 5.5 V at up to 400 kHz, and it is packaged in an 8-pin SOIC. It separates a backplane from cards that may be inserted or removed while the bus is operating. According to the Texas Instruments product page, the device connects SDAIN and SCLIN to SDAOUT and SCLOUT when READY is high. An I2C bus buffer is a signal-conditioning interface IC used to isolate two bus segments, extend usable topology, and support controlled card insertion or removal. In the device hierarchy, this function belongs to interface ICs and specifically to bidirectional bus buffers, repeaters, and accelerators. The TCA4311DR supports both I2C and SMBus-style two-wire systems, where data and clock lines require buffering rather than unidirectional level translation. Verified headline features include a 2.7 V to 5.5 V operating range, 400 kHz operation, bidirectional signal paths, hot-swappable bus isolation, an enable control, and an open-drain READY output. The READY output indicates that the backplane and card sides are connected together. When EN is high, normal operation resumes; setting EN low places the device into shutdown mode while the I2C bus is idle. The I2C specification cited by Texas Instruments permits up to 400 pF maximum bus capacitance, which can constrain practical bus length. The SMBus specification does not impose that capacitance restriction, although connected-device impedances still limit how quickly the system can meet rise-time and fall-time requirements. Designers should therefore evaluate board capacitance, wiring, pull-ups, and connected-device loading rather than treating buffer insertion as a universal cure for bus-loading problems. Typical uses include server and desktop backplanes, plug-in acquisition modules, industrial control cards, communications equipment, and embedded systems where a card connects to an always-powered bus. The buffer is placed between the backplane pins and card-side pins, preserving independent local behavior on each side. System designers should verify idle-bus shutdown sequencing and interpret READY correctly before enabling the card interface. PCB layout should keep SDA and SCL routing compact, preserve the intended pull-up arrangement on each bus side, and provide the decoupling and grounding required by the manufacturer datasheet. Because the verified material does not expose complete electrical timing, current, capacitance, and pin-level limits in the supplied text, those values remain marked for data completion rather than being inferred. This page combines verified manufacturer and distributor information with design guidance, replacement analysis, and practical procurement context. It also distinguishes true pin-compatible alternatives from packaging-only orderable variants, helping engineers make evidence-based interface decisions.
TCA6408PW - 8-Bit I2C I/O Expander | Texas Instruments
The Texas Instruments TCA6408PW is an 8-bit I2C and SMBus I/O expander supporting operation from 1.65 V to 5.5 V at up to 400 kHz, housed in a 16-pin TSSOP package. It provides eight general-purpose bidirectional port pins for remote input and output expansion, plus dedicated interrupt, reset, and configuration-register functions. An I/O expander is a bus-interface IC that extends the number of general-purpose inputs and outputs available to a microcontroller or other embedded controller. In the electronic-component hierarchy, the TCA6408PW is an I2C/SMBus interface controller, a serial interface expander, an interface IC, and ultimately a semiconductor. It reduces the number of host GPIO pins required for switches, indicators, sensors, and other external signals. The device's principal features include eight configurable I/O ports, a two-wire serial interface with a maximum clock frequency of 400 kHz, a broad 1.65 V to 5.5 V operating-voltage range, an interrupt output, a reset input, and configuration registers. These functions allow the host processor to read and control remote digital lines while receiving an interrupt when a relevant input condition occurs. The TCA6408PW uses addressable I2C control registers to configure port direction and input/output data. This register-based architecture keeps peripheral control separate from the host's limited GPIO resources. According to the Texas Instruments manufacturer datasheet, the device is intended for general-purpose remote I/O expansion across many microcontroller families using the I2C interface with SCL and SDA signaling. Typical applications include industrial control panels, battery-powered portable equipment, communications equipment, programmable logic controllers, and compact embedded systems with multiple discrete controls. The 1.65 V minimum operating voltage supports low-voltage portable systems, while the 5.5 V maximum covers conventional 5 V logic environments. The 400 kHz bus rate permits efficient register access when several compatible devices share the bus. Designers should account for the host's I2C address allocation, pull-up requirements on SDA and SCL, and the electrical characteristics of every attached P-port signal. Firmware should configure each port direction before enabling its outputs, and the reset, configuration, and interrupt functions should be considered when defining startup and event-handling behavior. This product page consolidates the verified distributor information, interface details, same-package replacement candidates, and application-oriented design guidance. It also distinguishes documented parameters from values that still require confirmation from the manufacturer datasheet, helping engineers evaluate TCA6408PW procurement and PCB drop-in decisions efficiently.
TCA6408PWR - 8-Bit I2C I/O Expander | Texas Instruments (Tape & Reel)
The Texas Instruments TCA6408PWR is an 8-bit I2C and SMBus I/O expander supporting operation from 1.65 V to 5.5 V at up to 400 kHz, housed in a 16-pin TSSOP package. It provides eight general-purpose bidirectional port pins for remote input and output expansion, plus dedicated interrupt, reset, and configuration-register functions. An I/O expander is a bus-interface IC that extends the number of general-purpose inputs and outputs available to a microcontroller or other embedded controller. In the electronic-component hierarchy, the TCA6408PWR is an I2C/SMBus interface controller, a serial interface expander, an interface IC, and ultimately a semiconductor. It reduces the number of host GPIO pins required for switches, indicators, sensors, and other external signals. The device's principal features include eight configurable I/O ports, a two-wire serial interface with a maximum clock frequency of 400 kHz, a broad 1.65 V to 5.5 V operating-voltage range, an interrupt output, a reset input, and configuration registers. These functions allow the host processor to read and control remote digital lines while receiving an interrupt when a relevant input condition occurs. The TCA6408PWR uses addressable I2C control registers to configure port direction and input/output data. This register-based architecture keeps peripheral control separate from the host's limited GPIO resources. According to the Texas Instruments manufacturer datasheet, the device is intended for general-purpose remote I/O expansion across many microcontroller families using the I2C interface with SCL and SDA signaling. Typical applications include industrial control panels, battery-powered portable equipment, communications equipment, programmable logic controllers, and compact embedded systems with multiple discrete controls. The 1.65 V minimum operating voltage supports low-voltage portable systems, while the 5.5 V maximum covers conventional 5 V logic environments. The 400 kHz bus rate permits efficient register access when several compatible devices share the bus. Designers should account for the host's I2C address allocation, pull-up requirements on SDA and SCL, and the electrical characteristics of every attached P-port signal. Firmware should configure each port direction before enabling its outputs, and the reset, configuration, and interrupt functions should be considered when defining startup and event-handling behavior. This product page consolidates the verified distributor information, interface details, same-package replacement candidates, and application-oriented design guidance. It also distinguishes documented parameters from values that still require confirmation from the manufacturer datasheet, helping engineers evaluate TCA6408PWR procurement and PCB drop-in decisions efficiently.
TCA6416ARTWR - 16-Bit I2C I/O Expander with Voltage Translation | TI
The Texas Instruments TCA6416ARTWR is a 16-bit translating I2C/SMBus I/O expander with 1.65V to 5.5V operation, 400 kHz Fast Mode I2C support, voltage translation between host and port banks, and an open-drain interrupt output, housed in a 24-pin WQFN (RTW) 4x4 mm package with exposed thermal pad. An I/O expander is a category of bus-interface IC that uses a serial protocol (typically I2C or SPI) to add parallel general-purpose input/output pins to a host microcontroller whose native GPIO count is insufficient. Architecturally the TCA6416ARTWR sits beneath the "I2C peripheral" hierarchy: it is a slave I2C device that decodes SCL/SDA traffic, drives 16 quasi-bidirectional I/O ports, and exposes a polarity-inversion register, configuration register, input/output register, and a maskable interrupt. Voltage translation allows a 1.8V host MCU to switch 5V external loads without level-shifters, which is essential when interfacing legacy industrial or LED-driver peripherals. Key features include 16 individually configurable I/O bits, hardware-address pins (A0/A1/A2) for up to 8 devices on one bus (128 total ports), an active-low RESET input, an open-drain INT output that signals input-state changes, and 5V tolerant I/O ports with 25 mA sink capability per pin. The WQFN-24 (RTW) 4x4 mm package offers a low 0.8 mm height, suitable for space-constrained handheld and embedded designs. The TCA6416ARTWR implements a write-then-read protocol where the host writes a command byte to select the target register (Input, Output, Polarity Inversion, or Configuration), then reads or writes the corresponding data byte. The interrupt is cleared by reading the input port register, giving firmware a clean edge-triggered event model. Internal pull-up current sources on each port line enable direct connection to switches or buttons without external resistors. Typical applications include expanding GPIO on portable consumer electronics, industrial control panels, IoT sensor hubs, white-goods HMI boards, and any design where a low-pin-count MCU (e.g., a 32-pin Cortex-M0) needs additional buttons, LEDs, or relay drivers. It is frequently paired with low-pin-count MCUs to keep BOM cost down. When designing with this device, place 0.1 uF decoupling capacitors close to VCCI and VCCP supply pins, keep the I2C SCL/SDA traces short, and ensure pull-up resistors (typically 4.7 kohm at 400 kHz) are sized against bus capacitance. The RESET pin should be tied to VCCI through a 10 kohm resistor unless driven by the host. This page synthesizes verified distributor stock, drop-in pin-compatible alternatives, and practical design notes not consolidated in the manufacturer datasheet, helping engineers shorten component selection time and avoid sourcing risk for production builds.
TCA6416PW - 16-Bit I2C I/O Expander | Texas Instruments
Texas Instruments TCA6416PW is a 16-bit I2C/SMBus I/O expander with a 1.65 V to 5.5 V operating supply range, 400 kHz bus support, interrupt output, reset control, and configuration registers in a 24-pin TSSOP package. It adds 16 general-purpose I/O ports to a host microcontroller through a two-wire serial interface, reducing the number of GPIO pins required in compact embedded systems. An I2C I/O expander is a type of interface IC and serial port expander that sits between a host processor and external digital lines. Its position in the hierarchy is I2C I/O expander > serial I/O expander > interface IC > semiconductor. The device is useful when a design needs more input, output, or bidirectional GPIO resources than the host controller can provide directly. Key features include 16 configurable I/O ports, bidirectional voltage-level translation through the 1.65 V to 5.5 V operating range, an interrupt output for change notification, a reset input, and configuration registers. The verified product information identifies the TCA6416 as an I/O expander for general-purpose remote I/O expansion across common microcontroller families using SCL and SDA. The TCA6416PW ordering option is supplied in a 24-pin TSSOP package. The device communicates through the I2C/SMBus-compatible two-wire interface at up to 400 kHz according to DigiKey's product listing. Configuration registers allow the host software to identify inputs, outputs, and polarity behavior, while the interrupt output provides a way for the host to react to a change on a monitored port. The reset and configuration features support deterministic initialization and power-management sequencing. Typical uses include industrial control panels, sensor and actuator interfaces, communication equipment, instrumentation, and embedded systems that need additional GPIO lines. It is particularly useful when board area, connector count, or host-controller pin availability is constrained, because sixteen external digital lines are added without dedicating sixteen parallel microcontroller pins. Designers should confirm the I2C pull-up requirements, address configuration, voltage levels, and reset timing in the manufacturer datasheet. The TSSOP footprint requires careful PCB layout and adequate clearance for the 24-pin package. Firmware should also define input, output, and polarity behavior before enabling interrupt-driven event handling. The manufacturer product page and verified distributor listings provide the primary source for electrical and ordering details.
TCA6416PWR - 16-Bit I2C I/O Expander | Texas Instruments (Tape & Reel)
Texas Instruments TCA6416PWR is a 16-bit I2C/SMBus I/O expander with a 1.65 V to 5.5 V operating supply range, 400 kHz bus support, interrupt output, reset control, and configuration registers in a 24-pin TSSOP package. It adds 16 general-purpose I/O ports to a host microcontroller through a two-wire serial interface, reducing the number of GPIO pins required in compact embedded systems. An I2C I/O expander is a type of interface IC and serial port expander that sits between a host processor and external digital lines. Its position in the hierarchy is I2C I/O expander > serial I/O expander > interface IC > semiconductor. The device is useful when a design needs more input, output, or bidirectional GPIO resources than the host controller can provide directly. Key features include 16 configurable I/O ports, bidirectional voltage-level translation through the 1.65 V to 5.5 V operating range, an interrupt output for change notification, a reset input, and configuration registers. The verified product information identifies the TCA6416 as an I/O expander for general-purpose remote I/O expansion across common microcontroller families using SCL and SDA. The TCA6416PWR ordering option is supplied in a 24-pin TSSOP package. The device communicates through the I2C/SMBus-compatible two-wire interface at up to 400 kHz according to DigiKey's product listing. Configuration registers allow the host software to identify inputs, outputs, and polarity behavior, while the interrupt output provides a way for the host to react to a change on a monitored port. The reset and configuration features support deterministic initialization and power-management sequencing. Typical uses include industrial control panels, sensor and actuator interfaces, communication equipment, instrumentation, and embedded systems that need additional GPIO lines. It is particularly useful when board area, connector count, or host-controller pin availability is constrained, because sixteen external digital lines are added without dedicating sixteen parallel microcontroller pins. Designers should confirm the I2C pull-up requirements, address configuration, voltage levels, and reset timing in the manufacturer datasheet. The TSSOP footprint requires careful PCB layout and adequate clearance for the 24-pin package. Firmware should also define input, output, and polarity behavior before enabling interrupt-driven event handling. The manufacturer product page and verified distributor listings provide the primary source for electrical and ordering details.
TCA6416PWT - 16-Bit I2C I/O Expander | Texas Instruments
Texas Instruments TCA6416PWT is a 16-bit translating I2C/SMBus I/O expander with a 1.65 V to 5.5 V operating supply range, interrupt output, reset input, and configuration registers in a 24-pin TSSOP package. It expands a serial I2C or SMBus connection into 16 general-purpose input/output ports, reducing the number of host-controller pins required by boards containing buttons, LEDs, logic signals, or control lines. An I/O expander is an interface IC that sits between a host processor and peripheral GPIO devices. The I2C or SMBus interface carries commands and register data over a compact serial bus, while the parallel port pins provide individually controlled digital connections. In the product hierarchy, the TCA6416PWT is an I/O expander, a serial-interface peripheral controller, and ultimately an integrated circuit used to extend digital input/output capacity. The device supports operation from 1.65 V to 5.5 V and provides voltage-level translation between the host bus and external GPIO circuitry. According to the Texas Instruments product page, it includes interrupt, reset, and configuration registers. The open-drain interrupt output indicates that an input state differs from the corresponding Input Port register state, allowing the host to avoid continuous polling. The RESET pin initiates the same reset and initialization sequence as power-on reset. Communication with the TCA6416PWT is supported at I2C/SMBus rates up to 400 kHz. The translated serial interface lets a host operating at one logic level communicate with attached circuitry operating at another voltage level within the device's specified operating range. This is particularly useful in compact industrial, communications, consumer, and embedded-control products where the controller has too few direct GPIO pins. TCA6416PWT applications include remote push-button panels, LED status indicators, relay-control interfaces, sensor digital outputs, and general board-level GPIO expansion. Designers can configure ports as inputs or outputs through the device registers, read input states, and receive an interrupt when a monitored input changes. The 24-pin TSSOP package is suitable for conventional surface-mount PCB assembly and offers a practical pin count for a 16-port device with serial control and interrupt support. When laying out the circuit, place the device close to the connector or controlled circuitry reached by the 16 port lines, while keeping the I2C bus routing short and away from high-current switching paths. Confirm pull-up resistor requirements, address configuration, logic thresholds, and the open-drain interrupt connection in the manufacturer datasheet. This page combines the device specifications, sourcing guidance, drop-in alternatives, comparison data, and application-focused engineering guidance for faster component evaluation and PCB planning.
TCA6424ARGJR - 24-bit I2C/SMBus I/O Expander | Texas Instruments
The Texas Instruments TCA6424ARGJR is a 24-bit I2C/SMBus I/O expander housed in a 32-pin UQFN (RGJ) 5x5 mm package with an exposed thermal pad. The device operates from a 1.65 V to 5.5 V supply on the I2C/SMBus side (VCCI) and supports 1.8 V, 2.5 V, 3.3 V and 5 V tolerant I/O banks on the P-port side (VCCP). It communicates through the standard I2C interface up to 400 kHz and provides 24 general-purpose bidirectional I/O lines organized as three 8-bit ports (P0, P1, P2). An I/O expander is a category of interface IC that adds extra general-purpose digital input/output lines to a microcontroller or processor that has run out of native GPIOs. In the broader taxonomy, the TCA6424ARGJR sits at: I/O expander -> peripheral expander -> interface IC -> integrated circuit. The device addresses a fundamental I/O shortage problem in compact, GPIO-constrained designs such as mobile phones, wearables, and low-cost MCUs without resorting to a more expensive processor. Key features include an open-drain interrupt output (INT) that asserts whenever any input state differs from the corresponding Input Port register, a hardware RESET pin that re-initializes all registers without removing power, and configurable register banks that allow simultaneous access without locking. The device supports standard (100 kHz) and fast (400 kHz) I2C modes and provides three hardware address pins (A0, A1, A2), allowing up to eight devices on the same I2C bus for a total of 192 I/O lines. Typical applications include adding keypad scanning, LED indicators, push-button monitoring, and GPIO expansion in cell phones, media players, industrial HMI panels, gaming consoles, and infotainment systems. The wide voltage tolerance (1.65 V to 5.5 V) makes it particularly useful when bridging a 1.8 V SoC to legacy 5 V peripherals. When designing with this part, ensure the VCCI supply is present whenever the device is communicating; the P-port voltage (VCCP) may be lower than VCCI. Place 0.1 uF decoupling capacitors close to both VCCI and VCCP pins. If multiple TCA6424A devices share the bus, assign unique A0/A1/A2 addresses and pull the INT outputs together or read each individually to avoid contention. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone. The UQFN-32 (RGJ) package footprint, configurable register banks, and RESET pin distinguish the TCA6424ARGJR from lower-cost expanders such as the TCA6408A or PCF8575.
TCA9517DGKR - I2C Bus Repeater Level Translator | TI
The Texas Instruments TCA9517DGKR is a 2-channel, bidirectional level-translating I2C bus repeater and buffer supporting 400 kHz (Fast-mode) I2C and SMBus operation, with A-side supply from 0.9 V to 5.5 V and B-side supply from 2.7 V to 5.5 V, housed in an 8-pin VSSOP (DGK) package. A level-translating I2C bus buffer is an interface IC that sits between two segments of an I2C or SMBus, electrically isolating the bus capacitance and logic levels on each side. In the interface IC hierarchy, it belongs to the signal buffer/repeater family of level translators, which sit above simple transistors and below full protocol bridges. By segmenting the bus, the repeater allows longer buses and more devices than the I2C standard capacitance limit would otherwise permit. Key features include support for both standard-mode (100 kHz) and fast-mode (400 kHz) I2C signaling, an enable (EN) pin for bus isolation and power sequencing, and powered-off high-impedance I2C pins that effectively remove the device from the bus when either supply is absent. The TCA9517 also incorporates an acceleration feature that speeds up the rising edge of SDA and SCL on the B side. Architecturally, the TCA9517 uses two distinct driver types. The A-side drivers operate from 0.9 V to 5.5 V and drive more current without requiring the buffered-low static offset voltage, so a low on the B side translates to a nearly 0 V hard low on the A side. This accommodates the smaller voltage swings of lower-voltage logic such as 1.2 V or 1.8 V I2C peripherals. The B side retains the static voltage offset needed for hot-swapping and rise-time acceleration. Typical applications include I2C bus expansion in industrial automation, server and telecom backplane management (SMBus), and level translation between 1.8 V microcontrollers and 3.3 V sensors or EEPROMs. Design consideration: the A-side output can sink more current than a plain MOSFET translator, so pay attention to total bus capacitance per segment; keep pull-up resistor values sized per segment rather than one pair for the whole bus. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
TCA9517DGKRQ1 - Automotive I2C Level-Shifting Buffer | TI
The Texas Instruments TCA9517DGKRQ1 is an automotive-grade, 2-bit level-translating I2C/SMBus buffer/repeater operating at up to 400 kHz, housed in an 8-pin VSSOP (DGK) package and qualified to AEC-Q100 for -40C to +125C operation. An I2C bus buffer, also called a level translator or bus repeater, is an interface IC that sits between two segments of an I2C or SMBus serial bus. Its role in the interface IC hierarchy is to isolate bus capacitance, allowing longer or more heavily loaded buses, and to translate logic voltage levels between devices powered from different supply rails, such as a 1.8V microcontroller talking to 5V peripherals. Key features include bidirectional voltage-level translation between low voltages down to 0.9 V on side A and 2.7 V to 5.25 V on side B, support for both standard-mode (100 kHz) and fast-mode (400 kHz) I2C plus SMBus, and a powered-off high-impedance state that isolates both bus segments when either supply rail is absent. The enable (EN) pin provides additional bus control, and open-drain I/O structures preserve the wired-AND nature of I2C. Technically, the TCA9517-Q1 drives both sides of the bus, refreshing rise times and removing the cumulative load of stubs and cables. Unlike passive FET level shifters, it does not trade drive strength for level translation, so clock stretching and multi-master arbitration are preserved. It supports up-translation, down-translation, and same-level buffering. Typical applications include automotive body electronics and infotainment I2C bus extension, PMBus/SMBus power-supply management in industrial systems, and level translation between 1.8V or 3.3V MCUs and 5V sensors or EEPROMs. Design consideration: because the device drives each side actively, do not connect the A and B sides to the same bus segment, and keep EN tied low until both supply rails are stable to avoid bus latch-up during power sequencing. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet alone. Pricing shown as of 2026-10-19.
TCA9517DR - Level-Shifting I2C Bus Repeater | Texas Instruments
The Texas Instruments TCA9517DR is a 2-bit level-translating I2C/SMBus bus buffer supporting 400 kHz Fast Mode operation, with an A-side supply range of 0.9 V to 5.5 V and a B-side supply range of 3.0 V to 5.5 V, housed in an 8-pin SOIC (D) package. An I2C bus buffer (also called a bus repeater or level translator) is an interface IC that sits between two segments of an I2C or SMBus serial bus. Its role in the interface IC hierarchy is to electrically isolate the two segments while translating signal levels between devices powered at different voltages, allowing low-voltage microcontrollers to communicate safely with higher-voltage peripherals. A buffer also isolates bus capacitance, so each side can drive longer traces or more devices than a single unbuffered bus would allow. Key features include fully bidirectional level translation with no direction-control pin, a low-level input on the A-side set at 0.3 x VCCA that accommodates smaller voltage swings of lower-voltage logic, and a powered-off high-impedance state on all pins so the part never loads the bus when unpowered. According to the TCA9517 datasheet, the A-side drivers operate from 0.9 V to 5.5 V, drive more current than B-side drivers, and do not require a buffered low or static offset voltage, producing a nearly 0 V hard low on the A-side. Architecturally, the TCA9517 uses open-drain drivers with rise-time support rather than a static 0.5 V low offset on the A-side, distinguishing it from the older PCA9517 generation. The 230 ns maximum propagation delay preserves I2C Fast Mode timing margins at 400 kHz, and the two channels translate both SDA and SCA lines simultaneously. Typical applications include connecting 1.8 V or 3.3 V MCU I2C ports to 5 V EEPROMs, sensors, and RTCs in industrial and telecom equipment, isolating bus capacitance in long backplane runs, and buffering densely loaded SMBus segments. Design consideration: keep the A-side connected to the lower-voltage, higher-capacitance segment; the B-side static 0.5 V offset requires pairing buffers B-side to A-side in cascaded topologies. This page synthesizes distributor pricing, verified drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.
TCA9534DWR - 8-Bit I2C I/O Expander | Texas Instruments
The Texas Instruments TCA9534DWR is an 8-bit I2C/SMBus I/O expander operating from 1.65 V to 5.5 V, supporting bus speeds up to 400 kHz and housed in a 16-pin SOIC package. It adds eight configurable parallel input/output ports to a host controller while providing an interrupt output and configuration registers. An I/O expander is an interface IC that increases the number of digital input and output lines available to a microcontroller or embedded processor. The TCA9534 belongs to the I/O expander class within interface ICs and power-management ecosystems, using a two-wire serial bus to exchange register data with a host. It is particularly useful when a system needs a few additional control, status, or monitoring signals without assigning dedicated host-controller pins to each function. Key device features include eight configurable I/O pins, three I2C address inputs, and operation across a 1.65 V to 5.5 V supply range. The device supports I2C and SMBus communication at frequencies up to 100 kHz or 400 kHz. An interrupt output provides a hardware indication that an input or output state has changed, while the configuration registers control port direction and polarity behavior for individual pins. The TCA9534DWR supports both input and output operation for its eight-port group. Register-based configuration allows the firmware to select input or output directions, read input levels, and update output values. The three address inputs permit multiple expanders to share the same bus when the system requires additional I/O. Because the device includes configuration registers, application software can define port behavior without requiring a separate external GPIO controller. Typical applications include industrial control panels, sensor and relay interfaces, LED status panels, battery-powered instrumentation, programmable logic controllers, and compact embedded systems. The wide 1.65 V to 5.5 V operating range also makes the device suitable for mixed-voltage systems where the host operates below the conventional 5 V logic level. The interrupt output can reduce unnecessary host polling when an attached switch, sensor, or other external event changes state. Designers should confirm the board voltage, I2C pull-up arrangement, address configuration, and input thresholds before layout. The SDA and SCL pins require appropriate bus pull-ups, while address pins must be connected to valid logic levels before the device begins communicating. Decoupling and signal-integrity practices are especially important when the expander sits near long cables, switching regulators, or electrically noisy equipment. This product overview combines the device architecture, operating limits, bus behavior, application guidance, and drop-in comparison information to support faster engineering selection. It also highlights practical layout and firmware considerations that help engineers evaluate the TCA9534DWR within the complete embedded-control system rather than treating it only as a list of basic parameters.
TCA9534DWT - 8-Bit I2C I/O Expander | Texas Instruments
The Texas Instruments TCA9534DWT is an 8-bit I2C/SMBus I/O expander with interrupt output and configuration registers, operating from 1.65 V to 5.5 V and supporting both 100 kHz Standard-mode and 400 kHz Fast-mode bus speeds. The device is packaged in a 16-pin SOIC package and provides eight general-purpose parallel input/output ports. An I2C I/O expander is an interface IC that increases the number of digital input and output lines available to a host processor. The TCA9534DWT uses a two-wire bidirectional I2C or SMBus connection for register access, while the eight external pins can be configured individually as inputs or outputs. This makes it useful for reducing microcontroller pin count in control, sensing, and actuator systems. The TCA9534DWT provides separate input and output configuration registers, allowing each of the eight ports to be used as an input or output. It also includes an interrupt output for change detection on configured input ports. The 1.65 V to 5.5 V operating range supports low-voltage digital systems, while 100 kHz and 400 kHz bus operation accommodates both standard and faster embedded communication requirements. The 16-pin SOIC package provides a compact surface-mount footprint for industrial, consumer, communications, and embedded-control equipment. The device is designed for systems that need more general-purpose digital I/O without adding a larger processor or complex programmable logic. The manufacturer product page identifies the TCA9534 family as an I2C/SMBus interface IC with interrupt and configuration registers. Typical applications include relay and solenoid control, LED status and indicator interfaces, keypad or button scanning, sensor input collection, and expansion of a microcontroller's available digital lines. The TCA9534DWT is particularly appropriate when a bus-connected peripheral can reduce wiring complexity and preserve host-controller pins for communications, timing, or analog functions. When designing around the TCA9534DWT, confirm the address configuration and electrical limits against the manufacturer datasheet before layout. Use appropriate pull-up resistors on the I2C bus and account for the operating voltage of both the expander and connected peripherals. This page combines the manufacturer product information, distributor references, package details, application guidance, and drop-in comparison information for engineering review.
TCA9534PWR - 8-Bit I/O Expander | Texas Instruments
The Texas Instruments TCA9534PWR is an 8-bit I2C and SMBus I/O expander with interrupt output and configuration registers, operating from 1.65 V to 5.5 V with a 400 kHz maximum bus clock in a 16-pin TSSOP package. The device provides eight general-purpose bidirectional I/O ports for systems whose microcontroller does not have enough local GPIO. An I/O expander is an interface IC that extends the number of digital input and output lines available to a host processor over a serial bus. The I2C interface connects the expander to a controller, while the eight parallel ports connect to switches, sensors, LEDs, relays, or other digital peripherals. In the system hierarchy, the TCA9534 is an interface IC and a GPIO expander built around an I2C-compatible serial interface. The TCA9534 includes three hardware address inputs, allowing up to eight devices to share one I2C bus. It also includes an interrupt output, configuration registers, and a power-on reset function that restores the device to its default state. The 1.65 V minimum supply voltage supports low-voltage embedded systems, while the 5.5 V maximum supports conventional 5 V peripherals and logic. The TCA9534PWR is suitable for industrial control boards, sensor interfaces, panel controls, LED indicators, configuration connectors, and compact embedded platforms. Its low-voltage operation and 400 kHz I2C speed make it useful when the host controller requires more GPIO resources without adding a high-speed switching regulator or a large package. The interrupt output allows the controller to service external state changes without continuous polling. Designers should place the device close to the I/O connector or controlled peripherals and route the I2C lines away from noisy switching nodes. Pull-up resistors must be selected for the actual bus voltage and capacitance. The three address pins should be configured before enabling the bus, and software must account for the TCA9534 register map and power-on reset behavior. The manufacturer datasheet should be used for the complete pin assignment and electrical limits. This page provides practical application guidance, parameter comparisons, drop-in replacement information, and design notes that support faster component selection and PCB implementation.
TCA9535DBR - 16-Bit I2C I/O Expander | Texas Instruments
Texas Instruments TCA9535DBR is a low-voltage, low-power 16-bit I2C and SMBus I/O expander with an interrupt output and configuration registers. It operates from 1.65 V to 5.5 V, supports I2C communication at up to 400 kHz, and provides 16 general-purpose parallel I/O lines in a 24-pin SSOP package. An I/O expander is an interface IC that increases the number of digital input and output pins available to a host controller. The host communicates with the TCA9535DBR through a two-wire I2C or SMBus interface, while the 16 external lines handle logic inputs, outputs, or mixed functions. In the system hierarchy, this device belongs to the interface IC family and bridges a serial control bus with parallel digital signals. The principal features are 16 independently configurable I/O pins, a 1.65 V to 5.5 V operating range, and a maximum bus frequency of 400 kHz. The interrupt output allows a connected controller to react when an input changes, reducing the need for continuous polling. Separate configuration registers support control of the direction and behavior of the I/O ports, while the device is designed for low-power operation. TCA9535DBR is packaged in a 24-pin SSOP, providing a compact surface-mount format for programmable control, monitoring, and signal-routing boards. Its I2C interface is suitable for buses that also carry configuration data or communicate with sensors, memory, and other interface devices. The 400 kHz capability allows the expander to operate on standard low-speed I2C systems without changing the host protocol. Typical applications include industrial control panels, programmable logic controllers, building automation equipment, test systems, and embedded products that require additional digital lines. The part can also expand button or switch inputs, control discrete logic signals, and provide interrupt-driven status reporting. Its small pin count relative to the number of external I/O lines helps conserve connector space and simplify system architecture. When designing around the TCA9535DBR, account for address selection, pull-up requirements, input thresholds, and the electrical characteristics of every attached signal. Confirm the board footprint and pin assignment against the manufacturer datasheet before release, especially when replacing a device with similar I/O count but different input or output polarity. The design notes and comparisons on this page provide practical guidance for firmware setup, PCB layout, and device selection.
TCA9535DBT - 16-Bit I/O Expander | Texas Instruments
The Texas Instruments TCA9535DBT is a 16-bit I/O expander for the I2C or SMBus interface, operating from a 1.65 V to 5.5 V supply at up to 400 kHz. The device provides 16 general-purpose bidirectional I/O lines, an interrupt output, and configuration registers in a 24-pin SSOP package. An I/O expander is an interface IC that increases the number of digital input and output pins available to a host controller without requiring a larger microcontroller package. The TCA9535 belongs to the I/O expander hierarchy, where a serial I2C or SMBus connection controls parallel digital lines. Its 16 ports can operate as inputs, outputs, or mixed configurations, making it useful for control panels, sensor aggregation, relay interfaces, and compact embedded systems. The main features include a wide 1.65 V to 5.5 V operating range, 16 general-purpose I/O lines, separate configuration registers, and an interrupt output. The I2C interface supports operation up to 400 kHz, while the three address inputs allow multiple devices to share the same serial bus. The interrupt output lets the connected processor respond only when a programmed input or output event occurs instead of polling every port continuously. Internally, the TCA9535 separates the 16 I/O lines into four eight-bit ports. Each port has its own configuration register, while dedicated input and output registers provide independent control of direction and data. This organization supports mixed input and output operation without requiring a separate GPIO controller for every line. Three hardware address inputs select the device address used on the shared bus. Typical applications include expanding a microcontroller's available GPIO, reading discrete switches and sensors, driving LEDs or digital control signals, implementing a keypad interface, and controlling multiple peripheral enables. The low-voltage operation also suits battery-powered and portable equipment where the host and expander operate from a 1.8 V, 2.5 V, 3.3 V, or 5 V system rail. Design the bus carefully when several expanders share SDA and SCL. Keep pull-up resistors within the range specified by the manufacturer datasheet, route the bus away from noisy switching nodes, and account for capacitance when increasing cable length or the number of devices. Decoupling close to VCC and GND improves stability in compact systems. This product page combines the manufacturer's core electrical characteristics, package and pin information, compatibility-focused alternatives, application guidance, and practical design considerations to support faster component selection and PCB planning.
TCA9535PWR - 16-Bit I/O Expander | Texas Instruments
Texas Instruments TCA9535PWR is a low-voltage 16-bit I2C and SMBus I/O expander with interrupt output and configuration registers, operating from 1.65 V to 5.5 V at up to 400 kHz and housed in a 24-pin TSSOP (PW) package. It adds 16 general-purpose parallel I/O lines to a host microcontroller or processor through a two-wire serial bus. An I/O expander is an interface IC that increases the number of digital input and output pins available to a host without requiring a large package or a dedicated parallel peripheral. The TCA9535PWR belongs to the broader I/O expander hierarchy, where each port bit can be independently configured as an input or output. Configuration, polarity-inversion, and interrupt functions make it suitable for systems that need remote control or change notification from external logic. The principal features include 16 independently configurable I/O pins, a 1.65 V to 5.5 V operating supply range, I2C/SMBus compatibility, and a 400 kHz bus rate. Separate configuration registers determine whether each port pin operates as an input with a high-impedance output driver or as an output. Polarity-inversion registers can reverse the logical interpretation of input pins, while the interrupt output provides a hardware indication of an input-state change. The two-wire interface reduces the number of host pins needed for peripheral expansion. The host writes to the configuration and polarity registers and reads port status over the serial bus. This arrangement is useful when the additional lines control relatively simple discrete functions rather than high-bandwidth data. The interrupt mechanism avoids continuous polling when a remote input or configured output state changes. Typical uses include LED and indicator control, button and switch input, relay-interface signaling, sensor-interface control, and general-purpose logic expansion in embedded products. The TCA9535PWR is particularly appropriate for low-voltage systems operating from 1.65 V through 5.5 V, including industrial control, communications equipment, consumer electronics, and programmable-logic applications. Design the power and signal path carefully. Confirm that every port-pin voltage remains within its applicable input and output limits, account for the total current drawn by simultaneously active outputs, and use pull-up resistors sized for the bus capacitance and operating speed. Treat the interrupt pin as an output signal from the expander and design firmware to clear the interrupt source before returning to normal polling. This product page combines manufacturer specifications, verified source links, pin-compatible alternatives, and application-oriented design guidance to accelerate component selection and PCB implementation. It also highlights the distinctions among device addressing and register behavior so engineers can identify the correct substitute before changing an approved design.
TCA9536-Q1 - 4-Bit I2C/SMBus I/O Expander AEC-Q100 | TI
The Texas Instruments TCA9536-Q1 is a 4-bit remote I/O expander for the I2C bus and SMBus with configuration registers, operating from a 1.65V to 5.5V supply in an 8-pin X2SON package measuring just 1.35 mm x 0.8 mm. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface and is AEC-Q100 qualified for automotive applications. An I/O expander is an interface IC that extends the number of general-purpose input/output (GPIO) pins of a microcontroller or system controller through a serial bus such as I2C or SMBus. In the hierarchy of embedded system components, the I/O expander sits within the interface IC family, alongside level translators, bus buffers, and serial transceivers, and functions as a remote GPIO peripheral for system masters that need additional discrete control or monitoring lines without adding a larger microcontroller. Key features of the TCA9536-Q1 include 4 configurable I/O pins that can be individually programmed as inputs or outputs through a 4-bit Configuration register, an Input Port register for reading pin states, an Output Port register for driving pins, and a Polarity Inversion register for active-HIGH or active-LOW operation. The device supports fast-mode I2C bus operation up to 1 MHz, uses only two bus lines (SDA and SCL), and operates across the wide 1.65V to 5.5V VCC range for compatibility with 1.8V, 2.5V, 3.3V, and 5V logic systems. The architecture implements four 4-bit registers (Configuration, Input Port, Output Port, and Polarity Inversion) accessible over the serial bus, with power-on reset defaulting all pins to inputs. Because the TCA9536-Q1 register map follows the widely deployed PCA9536 register convention, the same software drivers used for PCA9536-class expanders generally work unchanged, simplifying migration and second-sourcing within an existing firmware stack. Typical applications include automotive body-control modules, GPIO expansion in space-constrained sensor nodes, keypad or switch monitoring, LED and relay control through external drivers, and power-rail sequencing enables in infotainment and cluster displays. Its tiny X2SON footprint makes it especially attractive where board area is the limiting factor. Design consideration: because the X2SON package places multiple pins on very fine pitch beneath the die, follow TI's recommended PCB land pattern exactly, including via-in-pad thermal relief, and verify solderability with the correct reflow profile for the Q1 automotive grade. This page synthesizes verified distributor data, drop-in alternative analysis, and practical design guidance that goes beyond the raw datasheet parameters.