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PCA9501PW - 8-Bit I/O Expander with 2-kbit EEPROM | NXP
PCA9501PW

PCA9501PW - 8-Bit I/O Expander with 2-kbit EEPROM | NXP

NXP Semiconductors PCA9501PW is an 8-bit I2C and SMBus I/O expander with an integrated 2-kbit EEPROM, eight independently configurable quasi-bidirectional GPIO pins, and support for bus operation up to 400 kHz. The device is supplied in a 20-pin TSSOP package and is designed for 2.5 V to 3.6 V operation. An I/O expander is an interface IC that increases the number of digital input and output pins available to a host microcontroller or embedded processor. The PCA9501 sits within the interface IC hierarchy, where it connects a serial I2C or SMBus controller to LEDs, switches, sensors, and other board-level logic. Its quasi-bidirectional outputs can read external logic states while also driving indicator and control devices. The PCA9501 provides eight GPIO ports, a 2-kbit on-board EEPROM, an interrupt output, and six hardware address inputs. The EEPROM provides nonvolatile storage alongside the GPIO function, allowing the bus master to retain configuration or identification data. Hardware address pins allow up to 64 PCA9501 devices to coexist on one bus when address assignments and bus loading permit. The I2C and SMBus interfaces support operation at frequencies up to 400 kHz. Each GPIO may be configured independently as an input or output, and the input data and output configuration registers follow the familiar programming model of the PCF8574 family. The interrupt pin provides a hardware indication that one or more inputs have changed, reducing the need for continuous polling. Typical uses include LED and relay-control interfaces, configuration and status I/O, telecommunications equipment, networking hardware, base-station systems, and general-purpose expansion for installed boards. The integrated EEPROM also makes the device useful where a small amount of nonvolatile board data must accompany the I/O functions. Designers should account for the electrical behavior of quasi-bidirectional ports, pull up I2C and open-drain interrupt lines as required, and verify logic thresholds before driving external loads. PCB layouts should route the bus cleanly, provide stable bypass capacitance near the supply pins, and maintain adequate spacing between the TSSOP body and adjacent copper features. This page combines the verified NXP product information, manufacturer datasheet, distributor listing, and cross-reference results with practical guidance on pin behavior, bus addressing, interrupt handling, EEPROM use, PCB layout, and drop-in replacement assessment.

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PCA9507DP,118 - 2-Wire Bus Extender, 5V, 8-TSSOP | NXP
PCA9507DP,118

PCA9507DP,118 - 2-Wire Bus Extender, 5V, 8-TSSOP | NXP

The NXP PCA9507DP,118 is a 2-wire serial bus extender with integrated 3.3 V to 5 V level shifting, one bidirectional I²C/SMBus channel, and a 400 kHz maximum clock rate, packaged in an 8-pin TSSOP (SOT505-1, DP suffix). It provides bidirectional buffering of SDA and SCL lines while preserving all I²C operating modes (master/slave, multi-master, arbitration) across the level-shift boundary, and it extends the usable bus length up to 18 meters for HDMI DDC, I²C-bus, and SMBus links. The device operates from a 2.7 V to 5.5 V supply and is specified across the -40 °C to +85 °C industrial temperature range. What is an I²C bus extender? An I²C bus extender (also called a bus repeater or accelerator) is a type of interface IC that sits between two segments of a 2-wire serial bus and buffers both SCL (clock) and SDA (data) lines. Its purpose is twofold: to overcome capacitive loading limits that cap I²C bus length, and to translate voltage levels between dissimilar supply domains. The PCA9507 sits in the broader hierarchy of bus interface ICs (interface IC > bus extender > signal buffer/repeater), and is a specialized sibling of the I²C hub/switch family such as the PCA9543A. Key features of the PCA9507DP,118 include: 1 channel of buffered SDA + SCL; support for Standard-mode (100 kHz), Fast-mode (400 kHz), and 3.4 MHz Fast-mode Plus overshoot tolerant operation on the upstream port; 2.7 V to 5.5 V supply range; 218 ns typical propagation delay; and integrated rise-time accelerators that allow designers to drop the bus pull-up resistors while still meeting rise-time budgets on long cables. It also provides hot-swap insertion tolerance so that cards can be plugged into a live backplane without corrupting the bus. The internal architecture uses two N-channel MOSFET pass gates with charge-pump enhancement, plus direction-sensing comparators that automatically configure the channel as upstream or downstream. The upstream (master-side) port tolerates 3.3 V to 5 V, while the downstream port can operate down to 2.7 V, enabling typical 3.3 V-to-5 V HDMI DDC level shifting. The TSSOP-8 footprint makes the part suitable for compact HDMI connector breakouts, display modules, and embedded backplanes. Typical applications include HDMI/DVI Display Data Channel (DDC) level shifters, I²C-bus extension over long cables (up to 18 m) in industrial control panels, SMBus fan and chassis management links, and any board-to-board 2-wire link that must bridge a voltage-level or capacitive-load gap. Because the device preserves arbitration and clock-stretching behavior, it is safe to insert in the middle of an existing multi-master bus. When designing with the PCA9507, remember that the part is a pure bus extender with no pull-ups on either side. Both upstream and downstream segments still require external pull-up resistors sized to the segment capacitance, and the device's quiescent current (typically a few hundred microamps) must be included in the system power budget. For long cables, place the PCA9507 near the connector to keep the high-impedance stub short. This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical design notes for HDMI DDC and long-cable I²C applications - context not collected in the manufacturer datasheet alone.

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PCA9509DP,118 - I2C/SMBus Level Translating Repeater | NXP
PCA9509DP,118

PCA9509DP,118 - I2C/SMBus Level Translating Repeater | NXP

The NXP PCA9509DP,118 is a level translating I2C-bus/SMBus repeater that enables a processor low-voltage 2-wire serial bus to interface with standard I2C-bus or SMBus I/O, providing bidirectional buffering for both the SDA (data) and SCL (clock) lines at up to 400 kHz in an 8-pin TSSOP (SOT505-1) package. An I2C repeater (also called a bus buffer or redriver) is an interface IC that regenerates the two-wire serial signals so that capacitive loading and voltage-level differences do not limit bus length or device count. Within the interface-IC hierarchy (repeater -> bus buffer -> I2C/SMBus controller -> communication interface IC), repeaters sit between a low-voltage processor side and a higher-voltage peripheral side, keeping rise times and logic thresholds compliant on both segments. Key features include dual-supply level translation, supporting a low-voltage side and a standard 3 V to 5.5 V bus side, and bidirectional buffering that extends the I2C-bus by isolating capacitance on each segment. The device retains all operating modes and features of the I2C-bus system during level shifts, including clock stretching and multi-master arbitration behavior. A typical propagation delay of 109 ns and a low 2 pF input capacitance keep timing margin comfortable even at the 400 kHz fast-mode ceiling, while 5 mA supply current suits power-conscious designs. Technically, the PCA9509 uses open-drain buffer stages with rise-time acceleration so both bus segments retain true open-drain behavior: contention and backplane noise are not passed between segments, and the parts act as fault isolators between a captive processor bus and a larger peripheral bus. Typical applications include extending I2C from an MCU to backplanes and card cages, level-shifting between 1.x V/1.8 V/2.5 V processors and 3.3 V/5 V SMBus peripherals in servers, telecom line cards, and industrial control panels where bus capacitance would otherwise exceed the 400 pF I2C limit. Design-wise, plan pull-up resistor values per segment: each buffered side requires its own pull-ups sized for that segment's total capacitance, since the repeater isolates the two sides electrically. This page synthesizes distributor pricing, availability data, and practical design guidance not found in the manufacturer datasheet, with all parameters traced to NXP and distributor sources as of 2026-10-20.

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PCA9510ADP,118 - Hot-Swap I2C/SMBus Buffer | NXP Semiconductors
PCA9510ADP,118

PCA9510ADP,118 - Hot-Swap I2C/SMBus Buffer | NXP Semiconductors

The NXP Semiconductors PCA9510ADP,118 is a hot-swappable I2C-bus and SMBus bus buffer that allows I/O card insertion into a live backplane without corrupting the data and clock buses. It is supplied in an 8-pin TSSOP (SOP) surface-mount package and buffers one channel of the two-wire serial bus at operating speeds up to 400 kHz. An I2C bus buffer (also called a bus repeater or redriver) is a two-wire interface IC that sits between an I2C or SMBus controller segment and a downstream segment. Within the interface IC hierarchy - serial interface ICs to buffers/repeaters to logic ICs - its role is to isolate bus capacitance, extend the number of devices or cable length a bus can drive, and protect one segment from faults or transients on the other. The defining feature of the PCA9510A is its hot-swap control circuitry. During card insertion, contact bounce and partial power-up can corrupt SDA and SCL lines; the PCA9510A keeps the backplane side disconnected until a stop command or bus idle condition occurs on the backplane without bus contention on the card side. Only then does it make the bidirectional connection, preserving data integrity on the live backplane. Technically, the buffer provides bidirectional buffering with rise-time acceleration on the output sides, allowing larger bus capacitance than a raw I2C port can tolerate. It supports both the standard I2C-bus and the SMBus (System Management Bus) protocol and operates from a single supply, making it a drop-in isolation element between a backplane and a removable I/O card. Typical applications include live-insertion I/O cards in telecom and server backplanes, CompactPCI-style shelves, SMBus segments in power supplies and battery-backed systems, and any hot-pluggable module that must not disturb an operating two-wire bus during insertion or removal. Design consideration: keep the two bus segments physically separated on the PCB and provide adequate pull-up resistors sized for each segment's capacitance; the buffer does not eliminate the need for correct pull-up values on either side. This page synthesizes distributor pricing context, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with all electrical data traced to the NXP PCA9510A product data sheet (Rev. 01, 8 September 2005).

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PCA9512AD - Hot-Swap I2C/SMBus Buffer, 3.3V-5V | NXP
PCA9512AD

PCA9512AD - Hot-Swap I2C/SMBus Buffer, 3.3V-5V | NXP

The NXP PCA9512AD is a level-shifting, hot-swappable I2C-bus and SMBus buffer housed in an 8-pin SOIC package, providing bidirectional buffering for one channel at up to 400 kHz. It integrates two dedicated supply pins (VCC1 and VCC2) that allow independent 3.3 V and 5 V rails to coexist on the same bus while preserving maximum noise margin on each side. The device prevents backplane data/clock corruption during live card insertion by isolating the precharge voltages of the I/O card from the active backplane rails. An I2C/SMBus buffer is a bus repeater/accelerator that isolates two segments of a multi-drop serial bus, supports level translation between mixed-voltage nodes, and optionally accelerates the rising transitions of the SCL/SDA open-drain lines. Buffers sit between a controller and its peripherals, between two bus segments on a backplane, or between a host and removable card. The PCA9512 family belongs to NXP's broader bus-interface category, positioned between simple repeaters (e.g., PCA9507) and full multi-channel hubs (e.g., PCA9548). Hot-swap capability requires a precharge circuit that gently biases SCL/SDA before the card connector mates, avoiding the inrush glitches that would otherwise corrupt bus traffic. Key features of the PCA9512AD include 3 mA sink capability on each side per the I2C specification, support for bus voltages from 2.0 V to 5.5 V on either supply rail, and compatibility with Standard, Fast, and Fast-Plus (400 kHz) I2C modes. The buffer provides offset voltage between the two bus segments to prevent input-to-output latch-up, and it includes rise-time accelerator circuitry that minimizes bus settling time on heavily loaded segments. The 8-SO package is pin-compatible with the PCA9509 and other 8-pin I2C buffers, simplifying PCB layout reuse. The PCA9512AD is built on NXP's sub-micron CMOS process and uses an internal charge pump to drive the gate of the accelerator FETs, ensuring consistent rise-time performance across temperature. The dual-rail architecture allows designers to mix 3.3 V and 5 V devices on the same physical bus without external level translators, and the offset-impedance design prevents bus contention during simultaneous master access. ESD protection exceeds 2 kV HBM on the SCL/SDA pins. Typical applications include hot-swap I/O cards in telecom base stations, ATCA/cPCI backplane signal buffering, server management buses (IPMB, PMBus), and mixed-voltage I2C sensor aggregation. The device is commonly used where 3.3 V MCUs must communicate with 5 V legacy peripherals on the same bus segment. When designing with the PCA9512AD, ensure that VCC1 and VCC2 decoupling capacitors are placed within 2 mm of their respective supply pins. The offset voltage between bus segments must be accounted for in voltage-margin calculations, and live-insertion sequencing must guarantee that the I/O card's SCL/SDA lines reach the buffered idle state before the connector fully mates. Note: per the NXP product page, the PCA9512AD is End-of-Life, so designers should validate last-time-buy opportunities for production runs. This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance that goes beyond the manufacturer datasheet, helping engineers make informed replacement and supply-chain decisions for this EOL part.

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PCA9515AD - Dual I2C/SMBus Bus Repeater 400kHz | TI (Tape & Reel)
PCA9515AD

PCA9515AD - Dual I2C/SMBus Bus Repeater 400kHz | TI (Tape & Reel)

The Texas Instruments PCA9515AD is a dual bidirectional I2C bus and SMBus repeater (buffer/ReDriver) with 2 channels, supporting up to 400 kHz operation, supplied in an 8-pin SOIC package. It operates from a single 2.3 V to 3.6 V supply and its open-drain I2C I/O pins and enable input are 5.5-V tolerant. An I2C bus repeater is an interface buffer that isolates the capacitance and noise of one segment of an I2C or SMBus from another. Within the signal-chain hierarchy (I2C repeater -> bus buffer -> interface IC -> mixed-signal semiconductor), repeaters let a single controller address far more devices or far longer PCB traces and cables than the ~400 pF bus-capacitance limit would otherwise allow, while keeping rise times compliant. Key features include two identical bidirectional open-drain buffer channels, an active-high repeater-enable input (EN) for power-up isolation and bus segmentation, 5.5-V tolerant I2C I/O and EN for mixed-mode 3.3 V/5 V operation, and lockup-free operation that accommodates the clock-stretching and arbitration behavior of multi-master I2C systems. Technically, the PCA9515A is fabricated in a BiCMOS process. Each buffer uses a rising-edge accelerator and direction-sensing scheme that distinguishes a master-driven LOW from a slave-driven LOW, preventing the input-to-output latch-up that plagued first-generation repeaters. Because both channels are identical, the device can be used as two independent 1-bit repeaters or as a single 2-bit bus switch-style buffer. Typical applications include I2C bus segment isolation in servers and telecom cards, capacitive load expansion on long backplanes and cables, level-tolerant buffering between 3.3 V controllers and 5 V legacy peripherals, and SMBus systems in power-management and battery-pack designs. A key design consideration: the buffer is unidirectional-gain per edge, so it must not be used in loops or back-to-back without careful segmentation; place it where the bus capacitance exceeds roughly 400 pF or when isolating a noisy or fault-prone slave segment. This page adds value beyond the datasheet by synthesizing distributor pricing, verified drop-in alternatives, comparison tables, and practical layout guidance in one place.

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PCA9515ADR - Dual I2C/SMBus Bus Repeater 400kHz | TI
PCA9515ADR

PCA9515ADR - Dual I2C/SMBus Bus Repeater 400kHz | TI

The Texas Instruments PCA9515ADR is a dual bidirectional I2C bus and SMBus repeater (buffer/ReDriver) with 2 channels, supporting up to 400 kHz operation, supplied in an 8-pin SOIC package. It operates from a single 2.3 V to 3.6 V supply and its open-drain I2C I/O pins and enable input are 5.5-V tolerant. An I2C bus repeater is an interface buffer that isolates the capacitance and noise of one segment of an I2C or SMBus from another. Within the signal-chain hierarchy (I2C repeater -> bus buffer -> interface IC -> mixed-signal semiconductor), repeaters let a single controller address far more devices or far longer PCB traces and cables than the ~400 pF bus-capacitance limit would otherwise allow, while keeping rise times compliant. Key features include two identical bidirectional open-drain buffer channels, an active-high repeater-enable input (EN) for power-up isolation and bus segmentation, 5.5-V tolerant I2C I/O and EN for mixed-mode 3.3 V/5 V operation, and lockup-free operation that accommodates the clock-stretching and arbitration behavior of multi-master I2C systems. Technically, the PCA9515A is fabricated in a BiCMOS process. Each buffer uses a rising-edge accelerator and direction-sensing scheme that distinguishes a master-driven LOW from a slave-driven LOW, preventing the input-to-output latch-up that plagued first-generation repeaters. Because both channels are identical, the device can be used as two independent 1-bit repeaters or as a single 2-bit bus switch-style buffer. Typical applications include I2C bus segment isolation in servers and telecom cards, capacitive load expansion on long backplanes and cables, level-tolerant buffering between 3.3 V controllers and 5 V legacy peripherals, and SMBus systems in power-management and battery-pack designs. A key design consideration: the buffer is unidirectional-gain per edge, so it must not be used in loops or back-to-back without careful segmentation; place it where the bus capacitance exceeds roughly 400 pF or when isolating a noisy or fault-prone slave segment. This page adds value beyond the datasheet by synthesizing distributor pricing, verified drop-in alternatives, comparison tables, and practical layout guidance in one place.

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PCA9515ADT - 2-Channel 400kHz I2C Buffer | Texas Instruments
PCA9515ADT

PCA9515ADT - 2-Channel 400kHz I2C Buffer | Texas Instruments

The Texas Instruments PCA9515ADT is a two-channel bidirectional I2C bus and SMBus repeater operating from a 2.3 V to 3.6 V supply, supporting I2C operation up to 400 kHz in an 8-pin SOIC package. Its two identical bidirectional open-drain buffer circuits isolate and extend SDA and SCL connections while preserving bidirectional bus behavior. The active-high repeater-enable input provides a straightforward way to place each channel in a high-impedance state when it is not needed. An I2C repeater is an interface IC used to extend or segment a two-wire serial bus. I2C and SMBus systems connect controllers and peripherals through SDA and SCL, with pull-up resistors establishing the high logic level. Within the broader semiconductor hierarchy, a repeater belongs to the interface IC category and ultimately functions as a signal buffer and bus isolator. Adding a repeater can divide a long capacitive bus into shorter sections, reducing the load presented to the controller and improving signal integrity at Fast Mode speeds. The PCA9515A family provides two bidirectional channels, I2C and SMBus compatibility, active-high enable control, open-drain I/O, and mixed-mode signal support. Its I2C input/output pins and enable input are specified as 5.5 V tolerant, allowing interface signals to exceed the device's 3.6 V maximum supply voltage under the stated conditions. The architecture also supports Standard Mode and Fast Mode devices, multiple masters, and powered-off high-impedance I2C pins. The two identical channels make the PCA9515ADT useful for repeating both clock and data. Because the buffers are bidirectional, information can flow from either side of a channel through the same SDA or SCL path. The active-high enable input allows a host or reset controller to disconnect a repeated segment when isolation is required. TI identifies the device as a BiCMOS integrated circuit, combining bipolar and CMOS process characteristics in the same interface component. Typical uses include extending an I2C sensor bus, segmenting a long point-to-point connection, isolating controller and peripheral buses, and supporting mixed-mode systems that include both Standard Mode and Fast Mode devices. The 400 kHz operating capability suits sensors, EEPROMs, expanders, real-time clocks, and other common low-speed I2C peripherals. It can also assist when bus capacitance prevents one controller from reliably driving every attached device directly. Design the surrounding bus carefully because the repeater does not replace pull-up resistors or solve every signal-integrity problem. Place the device near the boundary between bus sections, provide the pull-ups required for each local segment, and confirm that enable control cannot float during power transitions. Review the manufacturer pin-description table when assigning PCB tracks and preserve adequate spacing from unrelated noisy circuitry. This page organizes the device's key electrical characteristics, application guidance, verified drop-in alternatives, and practical integration considerations. It is intended to help engineers compare bus-extension options and implement the PCA9515ADT without overlooking enable-state, voltage-tolerance, or capacitance requirements.

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PCA9515AP - 2-Channel 400kHz I2C Repeater | TI
PCA9515AP

PCA9515AP - 2-Channel 400kHz I2C Repeater | TI

The Texas Instruments PCA9515AP is a dual-channel bidirectional I2C bus and SMBus repeater operating at up to 400 kHz, supplied in an 8-pin PDIP package. Its two open-drain buffer channels support I2C and SMBus systems, while 5.5 V-tolerant I2C inputs and the enable input permit mixed-mode operation. The device operates from a 2.3 V to 3.6 V supply. An I2C repeater is a bidirectional bus buffer that regenerates a bus signal and separates it into two bus segments. It belongs to the interface IC hierarchy, where I2C and SMBus repeaters support communication among controllers, peripherals, sensors, and embedded processors. Unlike a unidirectional level translator, this device detects and forwards activity in either direction, allowing each side of the bus to retain its own pull-up network. The PCA9515A family provides two identical bidirectional open-drain buffers, an active-high enable input with an internal pull-up, and 5.5 V-tolerant bus and enable inputs. Mixed-mode signal operation is supported, while the open-drain I2C structure maintains wired-AND bus behavior. The verified distributor listing identifies the PCA9515AP as a 400 kHz, two-channel buffer in an 8-pin PDIP package. The repeater is built around BiCMOS interface circuitry intended to preserve the open-drain signaling used by I2C and SMBus. Because both sides communicate bidirectionally, bus capacitance, pull-up strength, rise time, and timing margins must be evaluated separately for each segment. The enable input is particularly useful during system reset because it can isolate a misbehaving peripheral, but its state should not change during an active I2C transfer. Typical uses include isolating a high-capacitance I2C bus, connecting sensors or EEPROMs to a remote bus segment, buffering a processor I2C controller, supporting SMBus power-management hardware, and isolating power domains whose logic levels remain compatible with the repeater. It can also help separate a bus into shorter segments when capacitive loading or timing margins become problematic. The primary design consideration is that the PCA9515AP is not a general-purpose bidirectional level shifter. Its supply range is 2.3 V to 3.6 V, and the enabled repeater must maintain compatible logic levels across both bus segments. External pull-up resistors should be placed close to each bus segment, with values selected from the actual capacitance and required rise time rather than copied blindly. This page consolidates verified distributor specifications, the official manufacturer datasheet, package details, application guidance, and honest replacement analysis. It also distinguishes verified drop-in interchangeability from mechanically similar parts that would require PCB changes, helping engineers compare alternatives without treating a same-family option as automatically safe to substitute.

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PCA9516APW - 5-Channel 400kHz I2C Bus Hub | NXP
PCA9516APW

PCA9516APW - 5-Channel 400kHz I2C Bus Hub | NXP

The NXP Semiconductors PCA9516APW is a 5-channel bidirectional I2C-bus and SMBus hub rated for operation up to 400 kHz, with open-drain input/outputs and individual active-HIGH repeater enables in a 16-pin TSSOP package. It extends an I2C bus by buffering both clock and data lines, allowing five downstream buses with up to 400 pF each. An I2C bus hub is an interface IC that regenerates and buffers SDA and SCL signals between a controller and multiple bus segments. In the product hierarchy, a bus hub is a type of I2C interface controller, interface IC, and semiconductor. This buffering approach reduces the loading presented to the upstream controller, separates downstream capacitive loads, and permits cable or board-distance extension where the original I2C bus would otherwise exceed its capacitance limit. Key features include five bidirectional repeater channels, active-HIGH individual repeater enable inputs, lock-up-free operation, support for arbitration and clock stretching across the repeater, and powered-off high-impedance I2C pins. The device accommodates Standard-mode and Fast-mode I2C devices and multiple controllers. Its operating supply range is identified by NXP as beginning at 2.3 V, while the available search results specifically describe 2.5 V and 3.3 V support. Each downstream segment can accommodate up to 400 pF. This is important because I2C uses open-drain signaling, and capacitance on SDA and SCL raises rise time and can cause timing failures. The PCA9516A architecture isolates each buffered bus segment, allowing unused channels to be disabled independently. Its powered-off high-impedance behavior helps avoid unwanted bus contention during shutdown or partial power-down conditions. Typical uses include extending sensor and EEPROM networks, isolating industrial control modules, supporting SMBus systems, and distributing clock and data to separate I2C branches. The hub is especially useful when multiple relatively slow devices create substantial bus capacitance or when a PCB layout requires electrical separation between controller and peripheral buses. Designers should connect pull-up resistors to each bus segment and place them in accordance with the bus voltage, capacitance, and rise-time requirements. Trace lengths, connector capacitance, and leakage current must be included in the worst-case electrical assessment. Disabled channels should not be assumed to provide isolation unless the enable state and powered-off pin behavior are verified for the operating condition. This page combines verified manufacturer and distributor information with practical bus-extension guidance, pricing context, package details, and replacement analysis. It is intended to help engineers determine whether a five-channel buffered hub is appropriate before committing a board design to the TSSOP-16 footprint.

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PCA9517D - 2-Channel 400kHz I2C Level Translator | Texas Instruments
PCA9517D

PCA9517D - 2-Channel 400kHz I2C Level Translator | Texas Instruments

The Texas Instruments PCA9517D is a two-channel bidirectional I2C and SMBus buffer/repeater operating up to 400kHz, with a supply voltage range of 2.7V to 5.5V and an 8-pin SOIC package. It provides voltage-level translation between low-voltage and higher-voltage bus domains and includes independent enable control for each side. What is a level-translating I2C buffer/repeater? It is an interface IC that connects two bidirectional serial buses operating at different voltage levels. The PCA9517D belongs to the I2C repeater and voltage-level-translator hierarchy, within interface ICs and semiconductors. Its two channels isolate bus voltage domains while preserving bidirectional data transfer, helping systems separate voltage levels without redesigning the upstream and downstream devices. Key verified features include two bidirectional channels, 400kHz operation, and compatibility with I2C and SMBus applications. The device can translate signals between low-voltage domains, including voltages down to 0.9V in the NXP-described PCA9517 function, and higher-voltage domains from 2.7V to 5.5V. The 8-SOIC package supports conventional surface-mount assembly and is identified by Texas Instruments as a two-channel signal buffer/repeater. The PCA9517D is useful when two I2C domains require different voltage ranges or when a bus segment needs buffering. Its two independent enables allow unused channels to be disabled, while the bidirectional architecture supports data flow in either direction. The verified distributor listing specifies 400kHz operation and an 8-SOIC package; detailed electrical limits should be confirmed against the manufacturer datasheet before production release. Typical applications include voltage-level translation between low-voltage sensors and higher-voltage controllers, SMBus isolation between subsystems, interface conditioning between PCB domains, and embedded systems where I2C devices use different supply rails. Because it is a repeater rather than a regulator, system designers must verify pull-up voltage, bus capacitance, propagation delay, and enable sequencing on each side. A key design consideration is that both sides of each channel must be properly referenced and pulled up for the voltage domains being supported. Do not assume that level translation removes the need for correct pull-up placement or timing review. Confirm the exact pinout, enable polarity, maximum loading, and operating limits from the official Texas Instruments documentation. This page combines verified distributor information, manufacturer product identity, interface-function context, package information, and practical selection guidance to support engineers searching for a PCA9517D replacement, equivalent, pinout, price, or I2C level-translation solution.

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PCA9517DG4 - 2-Channel 400kHz I2C Level Translator | Texas Instruments
PCA9517DG4

PCA9517DG4 - 2-Channel 400kHz I2C Level Translator | Texas Instruments

Texas Instruments PCA9517DG4 is a 2-channel bidirectional I2C bus and SMBus level-translating buffer/repeater operating up to 400 kHz, with low-side operation down to 0.9 V and high-side operation from 2.7 V to 5.5 V, in an 8-pin SOIC package. The device separates SDA and SCL buses into low-voltage and high-voltage domains so controllers and peripherals using different logic levels can communicate without direct logic-level incompatibility. An I2C level translator, also called a voltage-level translator, is an interface IC placed between two bidirectional open-drain buses. The PCA9517 belongs to the I2C buffer/repeater hierarchy, where it combines bidirectional buffering, voltage-level translation, and bus-segmentation functions. Its two-channel architecture allows SDA and SCL to cross independently between a low-voltage domain and a higher-voltage domain while preserving I2C clock stretching and SMBus-compatible operation. Key features include two bidirectional channels, operation from 0.9 V on the low side to 5.5 V on the high side, a maximum I2C bus speed of 400 kHz, and compatibility with both I2C and SMBus systems. The buffered channels can extend usable bus reach by isolating capacitance accumulated on the source side from the destination side. A quoted propagation delay of 170 ns and input capacitance of 6 pF are important when selecting pull-up resistors and evaluating timing margins. The PCA9517 uses bidirectional buffers rather than unidirectional voltage-level shifters. Because I2C and SMBus signals are open-drain and pulled up externally, each translated channel can conduct in either direction. This makes the device suitable for a host controller operating at a lower voltage communicating with sensors, memory devices, or expansion components whose pull-up network uses a higher supply voltage. The manufacturer describes the PCA9517 as a CMOS and BiCMOS integrated circuit for these applications. Typical uses include voltage adaptation between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains; isolating a long or heavily loaded I2C branch; and extending communication between a microcontroller and higher-voltage sensors or EEPROMs. Because both SDA and SCL require translation, the complete two-channel arrangement keeps data and clock voltage domains aligned. Designers must provide correct pull-up resistors on each side of the translator and account for the 170 ns propagation delay when calculating the maximum operating frequency. The 8-SOIC package is also used by the PCA9515A, while Texas Instruments' TCA9517 is identified as a comparable dual bidirectional I2C buffer. Review device-specific enable behavior, bus capacitance, and logic thresholds before finalizing a replacement. This page organizes the PCA9517DG4 specifications, replacement candidates, application guidance, and design considerations into one engineering-focused reference. It also distinguishes the published 0.9 V low-side capability from the 2.7 V to 5.5 V high-side range and identifies package and functional differences that matter when reusing an existing PCB.

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PCA9517DR - 2-Channel 400kHz I2C Level Translator | Texas Instruments (Tape & Reel)
PCA9517DR

PCA9517DR - 2-Channel 400kHz I2C Level Translator | Texas Instruments (Tape & Reel)

The Texas Instruments PCA9517DR is a two-channel bidirectional I2C and SMBus buffer/repeater operating up to 400kHz, with a supply voltage range of 2.7V to 5.5V and an 8-pin SOIC package. It provides voltage-level translation between low-voltage and higher-voltage bus domains and includes independent enable control for each side. What is a level-translating I2C buffer/repeater? It is an interface IC that connects two bidirectional serial buses operating at different voltage levels. The PCA9517DR belongs to the I2C repeater and voltage-level-translator hierarchy, within interface ICs and semiconductors. Its two channels isolate bus voltage domains while preserving bidirectional data transfer, helping systems separate voltage levels without redesigning the upstream and downstream devices. Key verified features include two bidirectional channels, 400kHz operation, and compatibility with I2C and SMBus applications. The device can translate signals between low-voltage domains, including voltages down to 0.9V in the NXP-described PCA9517 function, and higher-voltage domains from 2.7V to 5.5V. The 8-SOIC package supports conventional surface-mount assembly and is identified by Texas Instruments as a two-channel signal buffer/repeater. The PCA9517DR is useful when two I2C domains require different voltage ranges or when a bus segment needs buffering. Its two independent enables allow unused channels to be disabled, while the bidirectional architecture supports data flow in either direction. The verified distributor listing specifies 400kHz operation and an 8-SOIC package; detailed electrical limits should be confirmed against the manufacturer datasheet before production release. Typical applications include voltage-level translation between low-voltage sensors and higher-voltage controllers, SMBus isolation between subsystems, interface conditioning between PCB domains, and embedded systems where I2C devices use different supply rails. Because it is a repeater rather than a regulator, system designers must verify pull-up voltage, bus capacitance, propagation delay, and enable sequencing on each side. A key design consideration is that both sides of each channel must be properly referenced and pulled up for the voltage domains being supported. Do not assume that level translation removes the need for correct pull-up placement or timing review. Confirm the exact pinout, enable polarity, maximum loading, and operating limits from the official Texas Instruments documentation. This page combines verified distributor information, manufacturer product identity, interface-function context, package information, and practical selection guidance to support engineers searching for a PCA9517DR replacement, equivalent, pinout, price, or I2C level-translation solution.

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PCA9518DW - 5-Channel 400kHz I2C Hub | Texas Instruments
PCA9518DW

PCA9518DW - 5-Channel 400kHz I2C Hub | Texas Instruments

The Texas Instruments PCA9518DW is an expandable five-channel bidirectional I2C and SMBus buffer hub operating from a 3 V to 3.6 V supply at up to 400 kHz. It is packaged in a 20-pin SOIC and separates buffered SDA and SCL paths into groups that can each support up to 400 pF of bus capacitance. An I2C hub is a specialized interface IC that buffers and divides one upstream I2C or SMBus segment into multiple downstream segments. The I2C protocol limits the total capacitance supported by a conventional bus to 400 pF, where the limit is determined by connected devices and cable length. The PCA9518 expands that usable bus by placing isolated buffer groups between the upstream pins and downstream channel pins, allowing additional devices to be connected without redesigning the upstream bus. Key characteristics include five bidirectional downstream channels, operation across a 3 V to 3.6 V supply range, 400-kHz bus operation, and an expandable topology supported by the TI product family. Each downstream group buffers both clock and data in the forward direction while providing the return path required by the I2C protocol. The buffered arrangement also helps isolate capacitance between downstream segments rather than presenting every device directly to the upstream bus. The PCA9518 is useful in systems where a host controller must reach multiple embedded subsystems, sensor boards, EEPROMs, power monitors, or other low-speed peripherals beyond the practical capacitance of one unbuffered bus segment. Because the device is a bidirectional buffer hub rather than a general-purpose GPIO expander, it does not add individual digital input or output ports. It preserves the two-wire serial protocol while changing the electrical segmentation of the network. Typical uses include multi-board test equipment, industrial controllers, programmable instrumentation, server management boards, and modular sensor systems. The 20-pin SOIC package also supports conventional surface-mount assembly, although a footprint confirmation against the specific manufacturer ordering information is recommended before layout release because the verified data does not provide a complete pin table. When laying out a design, treat every upstream and downstream SCL and SDA connection as a separate routed segment and place the hub close to the point where the bus must be divided. Keep stub lengths short on high-capacitance branches and follow the manufacturer layout guidance for pull-up placement. Because the verified sources describe the function, package, voltage range, frequency, and bus-capacitance segmentation but do not publish detailed pin assignments or timing tables, those specific values should be confirmed against the official PCA9518 datasheet before release.

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PCA9518PW - Expandable 5-Channel I2C Hub | NXP
PCA9518PW

PCA9518PW - Expandable 5-Channel I2C Hub | NXP

The NXP PCA9518PW is a BiCMOS integrated circuit designed as an expandable five-channel I2C-bus hub for I2C and SMBus systems. According to the NXP product information, the device operates from a wider 2.3 V to 3.6 V supply range and improves partial power-down performance by keeping the I2C-bus I/O pins in a high-impedance state when VDD is below 2.0 V. The component is supplied in a 20-pin TSSOP package, making it suitable for compact embedded systems that require bus expansion or buffering between a host controller and multiple peripheral devices. The PCA9518 is a type of I2C bus buffer, a specialized interface IC within the broader I2C interface and semiconductor hierarchy. Its primary function is to extend or segment an I2C bus by providing five buffered downstream channels and a separate upstream channel. This allows a controller to communicate with more peripherals than the electrical limitations of a direct bus connection would permit, while helping isolate capacitive loading and improve signal integrity in multi-device systems. The expandable architecture supports systems where additional downstream buses can be added as peripheral count and board complexity increase. Key electrical characteristics include a 2.3 V to 3.6 V operating-supply range, partial power-down support, and operation in systems using either I2C or SMBus signaling. The high-impedance bus-pin behavior below 2.0 V is especially useful when a system must prevent unintended bus activity during shutdown, reset, or partial power sequencing. The 20-pin TSSOP package provides a surface-mount form factor suitable for industrial control, embedded instrumentation, communications equipment, and consumer-accessory designs. The device is used as a bus hub rather than as a power regulator or level translator. A typical implementation places the PCA9518PW between the host I2C controller and a group of downstream peripherals. Each downstream channel can serve a separate device group, helping distribute bus capacitance and provide a controlled interface boundary. Designers must still verify pull-up resistor placement, voltage compatibility, channel-loading conditions, and the power-state behavior of every connected device. For applications requiring more than five downstream channels, multiple PCA9518 hubs can be arranged in an expandable topology. This makes the part useful in modular industrial and test systems where a controller must support multiple removable or distributed peripheral groups. The 2.3 V to 3.6 V supply range also aligns it with common low-voltage digital systems, although every connected I2C device must support the same signaling voltage and compatible electrical limits. A key design consideration is preserving the high-impedance behavior during partial power-down. The bus pins should not be externally forced when VDD falls below 2.0 V, because doing so can compromise the intended isolation behavior. PCB layout should keep the hub close to the controller or branch point, follow the datasheet’s recommended decoupling and pull-up arrangements, and avoid long unprotected branches that increase capacitance and reduce rise-time margin. Engineers should confirm the final bus timing and voltage levels with the complete peripheral population. This product page combines verified manufacturer information, distributor identification, package data, and engineering-oriented selection guidance. It also distinguishes the confirmed PCA9518PW attributes from alternatives that require independent pinout and parameter verification rather than presenting them as automatic replacements.

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PCA9518PWR - Expandable 5-Channel I2C Hub | NXP (Tape & Reel)
PCA9518PWR

PCA9518PWR - Expandable 5-Channel I2C Hub | NXP (Tape & Reel)

The NXP PCA9518PWR is a BiCMOS integrated circuit designed as an expandable five-channel I2C-bus hub for I2C and SMBus systems. According to the NXP product information, the device operates from a wider 2.3 V to 3.6 V supply range and improves partial power-down performance by keeping the I2C-bus I/O pins in a high-impedance state when VDD is below 2.0 V. The component is supplied in a 20-pin TSSOP package, making it suitable for compact embedded systems that require bus expansion or buffering between a host controller and multiple peripheral devices. The PCA9518 is a type of I2C bus buffer, a specialized interface IC within the broader I2C interface and semiconductor hierarchy. Its primary function is to extend or segment an I2C bus by providing five buffered downstream channels and a separate upstream channel. This allows a controller to communicate with more peripherals than the electrical limitations of a direct bus connection would permit, while helping isolate capacitive loading and improve signal integrity in multi-device systems. The expandable architecture supports systems where additional downstream buses can be added as peripheral count and board complexity increase. Key electrical characteristics include a 2.3 V to 3.6 V operating-supply range, partial power-down support, and operation in systems using either I2C or SMBus signaling. The high-impedance bus-pin behavior below 2.0 V is especially useful when a system must prevent unintended bus activity during shutdown, reset, or partial power sequencing. The 20-pin TSSOP package provides a surface-mount form factor suitable for industrial control, embedded instrumentation, communications equipment, and consumer-accessory designs. The device is used as a bus hub rather than as a power regulator or level translator. A typical implementation places the PCA9518PWR between the host I2C controller and a group of downstream peripherals. Each downstream channel can serve a separate device group, helping distribute bus capacitance and provide a controlled interface boundary. Designers must still verify pull-up resistor placement, voltage compatibility, channel-loading conditions, and the power-state behavior of every connected device. For applications requiring more than five downstream channels, multiple PCA9518 hubs can be arranged in an expandable topology. This makes the part useful in modular industrial and test systems where a controller must support multiple removable or distributed peripheral groups. The 2.3 V to 3.6 V supply range also aligns it with common low-voltage digital systems, although every connected I2C device must support the same signaling voltage and compatible electrical limits. A key design consideration is preserving the high-impedance behavior during partial power-down. The bus pins should not be externally forced when VDD falls below 2.0 V, because doing so can compromise the intended isolation behavior. PCB layout should keep the hub close to the controller or branch point, follow the datasheet’s recommended decoupling and pull-up arrangements, and avoid long unprotected branches that increase capacitance and reduce rise-time margin. Engineers should confirm the final bus timing and voltage levels with the complete peripheral population. This product page combines verified manufacturer information, distributor identification, package data, and engineering-oriented selection guidance. It also distinguishes the confirmed PCA9518PWR attributes from alternatives that require independent pinout and parameter verification rather than presenting them as automatic replacements.

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PCA9518PWT - 5-Channel 400kHz I2C Hub | Texas Instruments
PCA9518PWT

PCA9518PWT - 5-Channel 400kHz I2C Hub | Texas Instruments

Texas Instruments PCA9518PWT is a five-channel bidirectional I2C/SMBus buffer and hub operating from 3 V to 3.6 V, supporting buses up to 400 kHz. The device is packaged in a 20-pin TSSOP (PW) and is designed to divide an I2C bus into buffered groups, each supporting up to 400 pF of bus capacitance. Its five downstream channels can expand a single controller interface into multiple isolated I2C branches for larger or more distributed systems. An I2C hub is a specialized interface IC that buffers the serial data and serial clock lines between an upstream controller and one or more downstream bus segments. Buffering reduces loading on the original bus and allows additional peripherals to be connected without exceeding the 400 pF capacitance limit associated with a conventional I2C segment. The PCA9518 operates in the broader hierarchy of I2C interface controllers, bus repeaters, bus hubs, interface ICs, and semiconductors. The principal features of the PCA9518PWT include five downstream channels, bidirectional SDA and SCL buffering, a 3 V to 3.6 V supply range, and support for 400 kHz I2C operation. The buffered-channel architecture is useful when a board contains multiple sensor banks, EEPROMs, real-time clocks, display controllers, or power-management devices. Each downstream branch is isolated from the others, helping one oversized or heavily populated bus segment from degrading the entire system. Texas Instruments describes the PCA9518 as an expandable five-channel bidirectional buffer for I2C and SMBus systems. Its architecture addresses the I2C protocol's maximum 400 pF bus-capacitance constraint by separating SDA and SCL into multiple groups. The buffered branches permit longer or more complex bus arrangements than a single unbuffered segment, provided each branch remains within its electrical and capacitive limits and follows the recommended connection and pull-up arrangement. Typical uses include industrial sensor networks, multi-channel EEPROM access, data-acquisition modules, communication equipment, embedded control boards, and test systems requiring more I2C capacity than a single host bus can support. Because the hub is designed specifically for bidirectional I2C signaling, it can also support SMBus-style arrangements where the electrical and protocol requirements align. The operating-temperature grade shown for the PW package is -40 °C to 85 °C, making it suitable for commercial and industrial equipment. When laying out a PCA9518PWT design, preserve short, clean SDA and SCL paths, place pull-up resistors at the locations specified by the manufacturer, and account for the capacitive loading of every downstream branch. Confirm that each branch stays within the 400 pF limit and verify timing margin at the intended 400 kHz operating rate. Avoid treating a buffered branch as a general-purpose isolated transceiver; it remains part of the connected I2C system. This product page consolidates the manufacturer's bus-capacity constraints, operating limits, package information, and sourcing-oriented details into an engineering reference. It also distinguishes the genuine same-package family option from products that merely appear similar by function, helping designers assess footprint compatibility, I2C topology, temperature requirements, and replacement risk before committing a PCB design.

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PCA9527DP - 3-Ch HDMI DDC/CEC I2C Bus Buffer | NXP
PCA9527DP

PCA9527DP - 3-Ch HDMI DDC/CEC I2C Bus Buffer | NXP

The NXP Semiconductors PCA9527DP is a 3-channel bidirectional open-drain bus buffer for HDMI Display Data Control (DDC) clock, data and Consumer Electronic Control (CEC), operating at up to 400 kHz from a 2.7 V to 5.5 V supply in a 10-pin TFSOP (10-TSSOP) package. A bus buffer (also called a bus extender or repeater) is a signal-conditioning device inserted between a master and a slave on a two-wire serial bus such as I2C-bus, SMBus or HDMI DDC. It belongs to the broader family of interface ICs and signal buffers, repeaters and splitters. Its role is to isolate bus capacitance on either side, so each segment sees only its own load, allowing longer cables and more devices than the raw bus standard permits. Key features of the PCA9527 include three independent bidirectional channels for SDA, SCL and CEC, support for the full 400 kHz Fast-mode I2C-bus operating range, and overvoltage-tolerant SDAx and SCLx pins. Propagation delay is a low 115 ns and input capacitance is only 8 pF, preserving setup and hold margins on long HDMI DDC cables. Architecturally, the PCA9527 uses open-drain bidirectional buffer stages with rise-time acceleration (buffer accelerator) circuitry. This rising-edge accelerator drives the bus high actively, compensating RC charging losses across long DDC lines while retaining all operating modes of the I2C-bus system during level shifting. According to the NXP datasheet, using the PCA9527 enables the system designer to isolate bus capacitance to meet the HDMI DDC version 1.3 distance specification. Typical applications include HDMI source and sink equipment (set-top boxes, TVs, monitors, AV receivers) where DDC/CEC lines must traverse cables or backplanes, notebook docking stations, and any system that extends I2C-bus or SMBus segments beyond the standard capacitance limit. The dedicated third channel carries CEC without consuming I2C channels. Design consideration: keep pull-up resistor values on both bus segments sized per segment capacitance; the accelerator helps but very heavy loads on the downstream side still degrade rise times, so verify rise-time compliance at the far end of the HDMI cable. This page adds value beyond the manufacturer datasheet by synthesizing distributor availability data, drop-in replacement guidance for this EOL part, practical design notes, and a comparison table in one place. Note: the PCA9527DP is listed by NXP as End of Life; pricing shown is indicative and all designs should plan a replacement strategy (as of 2026-10-20).

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PCA9527DP,118 - 3-Ch I2C/HDMI DDC CEC Bus Buffer | NXP
PCA9527DP,118

PCA9527DP,118 - 3-Ch I2C/HDMI DDC CEC Bus Buffer | NXP

The NXP PCA9527DP,118 is a 3-channel bidirectional open-drain bus buffer that supports up to 400 kHz I2C-bus operation, operates from a 2.7 V to 5.5 V supply, and provides a typical 115 ns propagation delay, housed in a 10-pin TSSOP (10-TFSOP, 0.118 inch width) package with the ,118 suffix denoting a Tape & Reel, RoHS-compliant shipping option. A bus buffer (also called a bus extender or repeater) is an interface IC inserted in series with a two-wire serial bus such as I2C (Inter-Integrated Circuit) or SMBus (System Management Bus). Within the broader hierarchy of interface semiconductors, bus buffers sit alongside level translators and line drivers, and their role is to segment bus capacitance, regenerate signal edges, and isolate parasitic loading so the bus can be longer or drive more devices than the raw open-drain bus standard would otherwise permit. Key features of the PCA9527 include three independent bidirectional channels dedicated to the HDMI Display Data Channel (DDC) clock and data lines plus the Consumer Electronics Control (CEC) line, support for Fast-mode 400 kHz I2C and SMBus signaling, an active-HIGH EN enable pin with an internal pull-up of approximately 100 kOhm to VCC(B) that places the device in a low-power down state when disabled, and two separate power supply pins that allow voltage level shifting between the two sides of the bus. Technically, the device uses rise-time accelerators on each open-drain channel to actively speed up rising edges that would otherwise be limited by pull-up resistors and bus capacitance. Input capacitance is 8 pF per pin, minimizing loading on the source side, and supply current is specified up to 100 mA. Because the channels are bidirectional and open-drain, no direction-control signal is required, which is essential for the acknowledge-clock-stretching behavior of I2C and DDC. Typical applications are HDMI source, sink, repeater, and switch designs where DDC and CEC lines must be buffered between the HDMI connector and an HDMI processor, EDID EEPROM access circuits, set-top boxes, TVs, AV receivers, and projectors. The buffered DDC prevents a hot-plugged HDMI cable's cable capacitance from corrupting EDID reads, while CEC buffering preserves the single-wire control channel integrity. A key design consideration: connect the EN pin to VCC(B) if the buffer should be always active, and remember that re-enabling introduces a recovery delay, so power sequencing of the two supply pins matters in hot-plug HDMI systems. This page synthesizes distributor pricing tiers, drop-in alternative options, and practical HDMI DDC design notes that are not consolidated in the manufacturer datasheet.

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PCA9534ADB - 8-Bit I2C I/O Expander, 16-SSOP | Texas Instruments
PCA9534ADB

PCA9534ADB - 8-Bit I2C I/O Expander, 16-SSOP | Texas Instruments

Texas Instruments PCA9534ADB is an 8-bit I2C and SMBus low-power I/O expander with interrupt output and configuration registers, designed for 2.3 V to 5.5 V operation. It supports bus speeds up to 400 kHz and is packaged in a 16-pin SSOP package for compact embedded systems. The device provides eight general-purpose remote I/O ports and three hardware address inputs, allowing multiple expanders to share one serial bus. An I/O expander is a bus-interface IC that increases the number of general-purpose input or output pins available to a host controller. The PCA9534ADB belongs to the I/O expander hierarchy within interface ICs and power management semiconductor systems. Its I2C or SMBus interface connects to a microcontroller, while the eight external pins can read logic states or control external circuits without adding another parallel GPIO port to the host board. The principal features include eight configurable I/O pins, a 2.3 V to 5.5 V operating range, 400 kHz I2C operation, an interrupt output, and configuration registers. Three address pins select one of eight fixed device addresses on the shared bus. The manufacturer specifies a -40 °C to 85 °C operating-temperature range for the PCA9534ADB ordering code. Communication with the device is register oriented. The host writes to the configuration register to select each port as input or output, reads the input and output registers to determine pin states, and uses the interrupt output to signal a change at a configured input pin. Separate input and output register behavior supports read-modify-write operations while allowing output-pin states to remain controlled independently from sensed input levels. Typical applications include industrial control modules, sensor-hub boards, programmable logic controllers, instrument panels, and compact embedded products that need additional GPIO. Eight low-voltage digital lines can monitor switches, enable converters, control indicators, or read discrete sensors. The interrupt line reduces unnecessary bus polling when an external state change occurs, which is useful in battery- and power-conscious systems. PCB design should route the I2C bus with short, compact traces and provide the decoupling and pull-up arrangements specified by the manufacturer. Confirm that the selected I/O direction, address configuration, and interrupt polarity match the firmware before release. Because the SSOP package has closely spaced leads, inspect solder-joint quality and confirm connector clearances during assembly. This product page combines manufacturer specifications, bus and register guidance, package information, application-oriented design notes, and a qualification-focused comparison with available same-footprint alternatives. It is intended to help engineers determine whether the PCA9534ADB satisfies voltage, temperature, bus-speed, package, interrupt, and software requirements before schematic capture or PCB layout.

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PCA9534ADW - 8-Bit I2C I/O Expander | Texas Instruments
PCA9534ADW

PCA9534ADW - 8-Bit I2C I/O Expander | Texas Instruments

Texas Instruments PCA9534ADW is an 8-bit I2C/SMBus I/O expander designed for 2.3 V to 5.5 V operation, with an operating temperature range of -40 °C to 85 °C and a 16-pin SOIC package. The device adds eight configurable remote I/O lines to a host microcontroller or processor through a two-wire serial interface. An I2C I/O expander is a peripheral integrated circuit that extends the number of digital input and output lines available to a system without increasing the host controller pin count. The PCA9534A belongs to the I/O expander, interface IC, and power-management-support semiconductor hierarchy. It is useful in compact embedded products where connectors, indicators, sensors, relays, or control signals exceed the native GPIO capacity of the controller. Key features include programmable configuration registers, an interrupt output for change detection, three hardware address inputs that allow multiple devices to share one bus, and support for both I2C and SMBus operation. The manufacturer identifies a maximum bus frequency of 400 kHz for the PCA9534ADW. Its low-power design is suited to battery-powered and industrial embedded systems, while the open-drain interrupt output supports wired-OR signaling across multiple expanders. The PCA9534A uses an 8-bit parallel I/O architecture with separate input and output register organization in the device family. Each port bit can be configured for input or output, allowing a design to mix sensed inputs and driven outputs. The hardware address pins allow up to eight devices to coexist on the same two-wire bus, which simplifies distributed I/O expansion in larger control systems. Typical applications include reading push buttons, controlling LEDs, monitoring digital sensors, driving discrete logic, interfacing external connector banks, and expanding control lines in industrial controllers, test equipment, appliances, and consumer electronics. The PCA9534ADW is particularly suitable when a controller has limited GPIO pins but already supports I2C. Designers should verify the I2C pull-up resistor network, ensure the total bus capacitance remains within device limits, and define how interrupt inputs are handled. External devices driving a port pin should be checked against the configured input/output direction. Firmware must also account for the PCA9534A register differences from older parallel-port expanders rather than assuming transparent software compatibility. This product page combines the exact ordering information, package details, functional limits, drop-in alternatives, and application-oriented design guidance for engineers evaluating the PCA9534ADW. It supports faster component selection while keeping the critical distinction between electrical compatibility and complete software compatibility explicit.

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PCA9534APW - 8-Bit I2C I/O Expander | Texas Instruments
PCA9534APW

PCA9534APW - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9534APW is an 8-bit I2C and SMBus I/O expander operating from 2.3 V to 5.5 V, with a 400 kHz bus rate and interrupt output, housed in a 16-pin TSSOP package. It provides eight general-purpose remote I/O lines while supporting three hardware address inputs for connecting multiple devices on one serial bus. An I2C I/O expander is a bus-interface integrated circuit that translates serial commands into parallel digital input or output operations. Its position in the hierarchy is I/O expander, interface controller, interface IC, and integrated circuit. This makes the PCA9534APW useful when a microcontroller or processor requires more general-purpose I/O pins than its package can provide directly. The device combines an 8-bit parallel I/O port, configurable input and output registers, and an active-low open-drain interrupt output. Address pins A0, A1, and A2 allow up to eight devices to share an I2C or SMBus bus. Low standby-current consumption of 1 uA maximum helps suit low-power embedded systems, while the 2.3 V to 5.5 V supply range supports both 3.3 V and 5 V system rails. The PCA9534A register organization includes separate port, input, output, polarity-inversion, and configuration registers, allowing each I/O line to be configured independently. This register-based control supports more flexible interrupt and input-polarity handling than simple fixed-function GPIO devices. The 400 kHz I2C interface rate provides sufficient bandwidth for routine control and status traffic. Typical applications include industrial control modules, programmable logic controllers, sensor-hub boards, appliance interfaces, LED-control boards, and compact embedded control systems. The device is particularly useful when a controller has limited spare pins but the PCB can accommodate another TSSOP-16 component and its address-selection wiring. PCB design should place the I2C pull-up resistors and device decoupling capacitor close to the relevant pins. Confirm address-strapping levels for every expander on the shared bus to prevent address conflicts, and route the active-low interrupt signal away from high-current switching nodes. This page combines device specifications, package and pin information, interface guidance, drop-in replacement candidates, and application-focused engineering notes to support faster component selection and PCB implementation.

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PCA9534DB - 8-Bit I2C I/O Expander | Texas Instruments
PCA9534DB

PCA9534DB - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9534DB is an 8-bit CMOS I2C/SMBus I/O expander operating from 2.3 V to 5.5 V, supporting bus speeds up to 400 kHz and packaged in a 16-pin SSOP. It adds eight configurable general-purpose input/output ports to a host microcontroller through a two-wire serial interface and provides an interrupt output for change notification. An I2C I/O expander is a peripheral that converts a serial I2C or SMBus connection into additional parallel digital input and output lines. In the product hierarchy, it is a general-purpose I/O expander, an interface IC, and ultimately a semiconductor. The PCA9534DB is useful when a controller has too few GPIO pins for buttons, indicators, relays, logic inputs, or other digital peripherals. Its three hardware address pins permit up to eight devices to share one bus. The principal features include eight independently configurable I/O ports, a 2.3 V to 5.5 V operating range, 400 kHz I2C operation, programmable configuration registers, and an active-low interrupt output. The TI product page also states that the device is pin-to-pin and I2C-address compatible with the PCF8574, although software changes are required because the PCA9534 adds enhanced register behavior. This makes it possible to retain familiar hardware while adopting more flexible configuration and interrupt handling. Internally, the device combines a serial interface with an 8-bit port register and a configuration register that establishes input or output operation for each port bit. The VCC range supports both 3 V and 5 V powered systems, while the 400 kHz bus rating provides compatibility with common embedded-control interfaces. The provided operating-temperature information identifies a -40 C to +85 C range, and the package information identifies a 16-pin SSOP compatible with MS-013 and SOT162-1 outlines. Typical applications include industrial control panels, sensor and relay interfaces, programmable logic controllers, communications equipment, portable instrumentation, and embedded systems requiring more GPIO than the host controller provides. In each case, the PCA9534DB can connect a microcontroller to discrete digital inputs and outputs while reducing the number of direct host pins required. The interrupt line can also support event-driven designs in which the controller processes input changes only after notification. When laying out a design, place the device close to the connector or controlled peripheral and keep SDA and SCL routing short. The verified material does not specify required external pull-up values, so those must be selected from the host-bus voltage, capacitance, and bus-speed requirements. Software should also account for the PCF8574 compatibility qualification: the hardware interface is compatible, but the PCA9534 enhancements require firmware changes. This product data combines the verified manufacturer and distributor references with a practical comparison against PCF8574- and PCA9554-family devices. It distinguishes true package and pin compatibility from broader functional similarity, identifies unresolved pricing and electrical details, and highlights the design checks needed before replacing an existing I/O-expander implementation.

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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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