Interface ICs
Subcategories
Products (3,400+)
P82B96PW - 2-Channel 2-15V I2C Bus Extender | TI
The Texas Instruments P82B96PW is a dual bidirectional I2C-compatible bus buffer and cable extender with a 2 V to 15 V operating range, 400 kHz bus speed, and an 8-pin TSSOP (PW) package. It supports bidirectional data transfer between I2C/SMBus systems operating at different voltage or current levels. According to the verified manufacturer product information, the device is intended for interface buffering in systems where trace length, capacitance, voltage-level differences, or loading reduce bus reliability. Its dual-channel architecture allows two independent bus directions or paired sideband signals to be extended through the same package. The P82B96 family belongs to the bidirectional bus-buffer category, which includes I2C buffers, SMBus repeaters, level translators, and bus extenders. Unlike a unidirectional logic buffer, a bidirectional bus buffer must detect and preserve the direction of data while allowing both sides to drive and receive the same lines. This makes the device useful between a host controller and remote sensors, EEPROMs, FPGAs, embedded processors, or other I2C targets that operate at a different electrical reference or require additional bus drive capability. The verified listing identifies P82B96PW as a 2-channel, 400 kHz buffer/reDriver in an 8-pin TSSOP package. The manufacturer describes the device family as a 2-bit bidirectional 2- to 15-V I2C/SMBus buffer and cable extender. The operating temperature range shown in the verified part information is -40 °C to +85 °C. The PW package is a compact surface-mount form suitable for industrial and embedded board layouts, while the 2-bit configuration reduces the number of separate buffer packages needed when multiple related bus lines must be conditioned. A key design consideration is the relationship between bus capacitance, cable or trace length, pull-up resistance, and supported clock rate. Buffering does not remove the need for correct I2C pull-up placement; it provides an intermediate drive point that can isolate the source-side and remote-side buses. The engineer should verify voltage compatibility on both sides, account for the maximum remote-bus loading, and test the complete network at the intended 400 kHz operating condition. The verified datasheet source should be consulted for detailed logic thresholds, timing, and application limits. Typical uses include extending an I2C sensor bus in industrial control equipment, buffering an SMBus connection in a power system, separating a controller from a cable-connected peripheral, and bridging logic domains when voltage-level and current requirements differ. It is also useful in test fixtures and embedded platforms where a long cable or dense peripheral load would otherwise weaken the original bus. Compared with a simple series resistor or passive level shifter, the P82B96 provides an active bidirectional buffer and defined cable-extension function, while still requiring careful external pull-up and grounding design. This product page consolidates the verified manufacturer description, distributor listing information, package identification, pricing reference, and application-oriented guidance. It does not infer unprovided electrical thresholds or invent a cross-brand substitute where the supplied cross-reference data does not establish pin compatibility. The result is intended to support initial component selection and PCB planning, followed by validation against the official P82B96 datasheet and application circuit.
P82B96PWG4 - 2-Channel 400kHz I2C Bus Buffer | Texas Instruments
Texas Instruments P82B96PWG4 is a 2-bit dual bidirectional I2C/SMBus buffer and cable extender that supports operation from 2 V to 15 V at up to 400 kHz. The device accommodates two channels, operates from a 15 V maximum supply, and is supplied in an 8-pin TSSOP package. It supports bidirectional I2C data transfer, interfaces buses operating at different logic levels, and allows bus capacitance up to 400 pF on the main bus. An I2C bus buffer is an interface IC placed within a controller-to-peripheral bus path to extend reach, isolate bus segments, reconcile voltage domains, and improve capacitive loading behavior. The P82B96 belongs to the bidirectional bus buffer family within the broader interface IC and semiconductor hierarchy. It is useful where one I2C controller must communicate with remote devices across cable or PCB-routing distances. Key features include two independently buffered bidirectional channels, a 400 kHz operating frequency, operation over a 2 V to 15 V supply range, and support for connecting I2C buses with different logic levels. The 8-TSSOP package supports compact surface-mount layouts. According to the manufacturer datasheet, the device also handles the added low period associated with bus capacitance and clock stretching while preserving standard I2C timing behavior. The P82B96 architecture uses passive-style bus-side connections in the familiar I2C arrangement, allowing each buffered segment to communicate in both directions. Designers should account for the device's internal delay, pull-up placement, capacitance limits, and voltage compatibility when calculating timing and fault behavior. The manufacturer states that the actual bus-clock period, including a 482 ns clock-stretch effect, can be limited to approximately 2745 ns, corresponding to about 364 kHz under the cited condition. Typical applications include extending an I2C sensor bus across a larger PCB, isolating a high-capacitance peripheral segment, bridging sections of an industrial control system, and supporting low-voltage logic domains on one side and higher-voltage I2C devices on the other. It is also suitable for cable-based I2C extensions where the permitted bus capacitance is confirmed by system calculations. A key design consideration is pull-up placement: each I2C bus segment normally requires its own appropriate pull-up network, and placing pull-ups on the wrong side of the buffer can undermine isolation or exceed the permitted capacitance. Verify timing with the slowest participating device, clock stretching, cable length, and actual bus capacitance rather than relying only on the nominal 400 kHz rating. This page consolidates verified manufacturer and distributor information, a drop-in-alternative assessment, application guidance, and practical interface-design considerations into a design-oriented reference for engineers evaluating the P82B96PWG4.
P82B96PWR - 2-Channel 2-15V I2C Bus Extender | TI (Tape & Reel)
The Texas Instruments P82B96PWR is a dual bidirectional I2C-compatible bus buffer and cable extender with a 2 V to 15 V operating range, 400 kHz bus speed, and an 8-pin TSSOP (PW) package. It supports bidirectional data transfer between I2C/SMBus systems operating at different voltage or current levels. According to the verified manufacturer product information, the device is intended for interface buffering in systems where trace length, capacitance, voltage-level differences, or loading reduce bus reliability. Its dual-channel architecture allows two independent bus directions or paired sideband signals to be extended through the same package. The P82B96 family belongs to the bidirectional bus-buffer category, which includes I2C buffers, SMBus repeaters, level translators, and bus extenders. Unlike a unidirectional logic buffer, a bidirectional bus buffer must detect and preserve the direction of data while allowing both sides to drive and receive the same lines. This makes the device useful between a host controller and remote sensors, EEPROMs, FPGAs, embedded processors, or other I2C targets that operate at a different electrical reference or require additional bus drive capability. The verified listing identifies P82B96PWR as a 2-channel, 400 kHz buffer/reDriver in an 8-pin TSSOP package. The manufacturer describes the device family as a 2-bit bidirectional 2- to 15-V I2C/SMBus buffer and cable extender. The operating temperature range shown in the verified part information is -40 °C to +85 °C. The PW package is a compact surface-mount form suitable for industrial and embedded board layouts, while the 2-bit configuration reduces the number of separate buffer packages needed when multiple related bus lines must be conditioned. A key design consideration is the relationship between bus capacitance, cable or trace length, pull-up resistance, and supported clock rate. Buffering does not remove the need for correct I2C pull-up placement; it provides an intermediate drive point that can isolate the source-side and remote-side buses. The engineer should verify voltage compatibility on both sides, account for the maximum remote-bus loading, and test the complete network at the intended 400 kHz operating condition. The verified datasheet source should be consulted for detailed logic thresholds, timing, and application limits. Typical uses include extending an I2C sensor bus in industrial control equipment, buffering an SMBus connection in a power system, separating a controller from a cable-connected peripheral, and bridging logic domains when voltage-level and current requirements differ. It is also useful in test fixtures and embedded platforms where a long cable or dense peripheral load would otherwise weaken the original bus. Compared with a simple series resistor or passive level shifter, the P82B96 provides an active bidirectional buffer and defined cable-extension function, while still requiring careful external pull-up and grounding design. This product page consolidates the verified manufacturer description, distributor listing information, package identification, pricing reference, and application-oriented guidance. It does not infer unprovided electrical thresholds or invent a cross-brand substitute where the supplied cross-reference data does not establish pin compatibility. The result is intended to support initial component selection and PCB planning, followed by validation against the official P82B96 datasheet and application circuit.
P82B96PWRG4 - 2-15V 400kHz I2C Buffer | Texas Instruments
The Texas Instruments P82B96PWRG4 is a 2-bit bidirectional I2C and SMBus buffer designed for bus isolation, voltage-level translation, and cable extension between buses operating at different logic levels. Its operating supply range is 2 V to 15 V, supported bus frequency is 400 kHz, and the device is packaged in an 8-pin TSSOP. The P82B96 provides two independently buffered bidirectional channels and supports multiple P82B96 devices in star or multipoint configurations. An I2C bus buffer is an interface IC placed between two bus segments to buffer bidirectional clock and data signals. It helps isolate bus capacitance, separate supply domains, extend cable reach, and prevent contention between devices on different portions of a bus. Within the power-management hierarchy, the P82B96 functions as a signal-conditioning and interface component rather than a regulator or digital logic gate. The principal feature set includes bidirectional data transfer, operation with I2C and SMBus systems, and a supply range covering 2 V through 15 V. Because the two buffered sides can use different logic levels, the device can interface I2C buses operating at different voltages. Its 400 kHz operating capability supports standard Fast-mode I2C communication while providing electrical separation between the main bus and the buffered side. The device uses two bidirectional channels identified in manufacturer documentation as Tx/Rx and Ty/Ry, with corresponding Sx and Sy bus-side nodes. Manufacturer guidance states that there are no restrictions on interconnecting Tx/Rx and Ty/Ry I/O pins to other P82B96 devices in star or multipoint arrangements. This flexibility supports bus partitioning in systems with multiple isolated branches or line-card slave devices. Typical applications include separating a main I2C bus from a remote cable segment, translating between different logic voltages, extending an I2C bus to line-card peripherals, and isolating high-capacitance branches from the main bus. The same 8-pin TSSOP footprint is useful for compact industrial, communications, and embedded-control equipment where PCB area is constrained. Designers should account for each side's pull-up resistor network, verify that all attached devices remain compatible with the target I2C mode and voltage levels, and confirm that the selected logic levels satisfy the device's electrical limits. Because the verified excerpts do not provide a complete pin table, capacitance limits, propagation-delay limits, or thermal data, those values should be confirmed in the manufacturer datasheet before release to production. This page combines the verified manufacturer description, distributor availability information, package details, pin-compatible substitute evidence, application guidance, and design considerations to support faster component selection and PCB planning without duplicating the full datasheet.
P82B96TD/S911 - 2-15V 400kHz I2C Bus Buffer | NXP
The NXP Semiconductors P82B96TD/S911 is a dual bidirectional bus buffer that creates a non-latching logic interface between a conventional I2C bus and other bus configurations operating at different voltage or current levels. The device supports a 2 V to 15 V signal range, a 400 kHz bus rate, and an 8-pin SO surface-mount package. Its bidirectional interface capability makes it suitable for voltage-level translation, bus isolation, and cable extension where system-side and logic-side devices do not share identical electrical limits. An I2C bus buffer is a specialized interface integrated circuit that separates two bus segments while allowing clock and data information to pass in either direction. The P82B96 belongs to the hierarchy of bidirectional bus buffers, logic-level translators, interface ICs, and power-management components designed for robust digital interconnect. Unlike a unidirectional level translator, its non-latching architecture supports two-wire communication in both directions and allows connected devices to recognize bus states across the interface. The principal electrical features include a 2 V to 15 V operating range, a 400 kHz maximum I2C operating frequency, and support for interfaces involving 3.3 V logic, low-current SMBus signaling, and logic levels up to 15 V. The buffered architecture reduces the loading imposed on the upstream bus while providing separate side connections for compatible downstream devices. Its bipolar IC construction is identified directly in the manufacturer documentation. The device is designed to bridge buses that differ in voltage and current requirements rather than merely repeating identical logic levels. NXP identifies examples including 350 µA SMBus signaling, 3.3 V logic devices, and 15 V-level or low-impedance lines. The non-latching behavior is important because it preserves the electrical interpretation of bus signals without introducing a held state when the interface is inactive. Typical uses include I2C bus extension, SMBus isolation, level translation between legacy and modern logic domains, and protection of controller pins from capacitive loading. It can also simplify PCB partitioning by placing the buffer between two bus segments and reducing the distance over which a single segment must operate. The 8-pin SO package supports compact surface-mount layouts in industrial, communications, and embedded equipment. A key design consideration is that buffered sections do not automatically remove every bus-compliance issue. Engineers should verify pull-up values, bus capacitance, rise-time requirements, enable polarity, reference-voltage configuration, and the voltage applied to each side against the manufacturer datasheet. Grounding and trace routing should also keep the buffered bus away from noisy power converters to prevent false start or data corruption. This page combines the manufacturer part information, exact verified package and operating details, ordering references, and practical guidance for selecting and implementing the P82B96TD/S911. It also identifies the verified same-footprint options while clearly separating them from general functional equivalents that have not been confirmed as pin-compatible drop-ins.
PCA82C251T - 24V CAN Transceiver, 1MBd, SOIC-8 | NXP
The NXP PCA82C251T is a legacy CAN (Controller Area Network) bus transceiver that serves as the physical interface between a CAN protocol controller and the differential CAN bus, operating at data rates up to 1 MBd in 24V automotive and industrial systems. Housed in an 8-pin SOIC (SO-8) surface-mount package, it provides differential transmit capability to the bus and differential receive capability to the CAN controller, with full conformance to the ISO 11898-24V standard for 24V systems used in trucks, buses, and heavy industrial vehicles. A CAN transceiver is a physical-layer (PHY) device that converts the single-ended digital transmit (TXD) and receive (RXD) signals from a CAN protocol controller into the differential dominant/recessive signaling required by the CAN bus. It sits between the protocol controller (an MCU with a CAN module) and the twisted-pair bus, providing the drive strength, common-mode rejection, and bus-fault protection needed for robust communication. The PCA82C251 belongs to the broader family of CAN transceivers and is part of the NXP (formerly Philips Semiconductors) automotive connectivity portfolio. Key features of the PCA82C251T include a maximum data rate of 1 MBd, wide supply voltage range of 4.5V to 5.5V (typical 5V), bus terminals tolerant to -27V to +40V transients, low current consumption in standby and recessive states, thermal shutdown protection, and current limiting on the bus outputs. The device operates over the -40C to +125C automotive temperature range, making it suitable for under-hood applications and other harsh industrial environments. It is supplied in the industry-standard 8-pin SOIC (SO-8) package for reflow-soldered surface-mount assembly. The PCA82C251T uses a bipolar CMOS process with on-chip bus-driver protection and slope-control circuitry to limit RFI emissions. Its high-impedance bus input during supply loss prevents the device from loading the bus when unpowered, supporting multi-node hot-swap scenarios. Compared to lower-voltage CAN transceivers, the 24V-tolerant bus pins make this part specifically suited for trucks, buses, agricultural machinery, and industrial CAN networks powered from 24V rails where common-mode transients exceed the range of 12V-only parts. Typical applications include 24V truck and bus CAN networks, agricultural and construction equipment CAN buses, industrial automation CANopen networks, forklift and material-handling vehicle communication, and CAN-based battery management in 24V lead-acid battery stacks. The ISO 11898-24V conformance also makes it a candidate for heavy-duty on-road and off-road vehicle communication backbones. When designing with the PCA82C251T, note that it is a legacy part and the modern TJA1051T, TJA1042T, or TJA1057T from NXP offer lower quiescent current, faster loop times, and improved EMC behavior for new designs. Engineers should select a 24V-rated replacement only when pin-compatibility or bus-fault tolerance is critical; the standard 12V TJA1050T is NOT a drop-in because its bus common-mode range is narrower and will not survive 24V-system transients. This page synthesizes distributor pricing, verified drop-in alternatives (same-brand and cross-brand in SOIC-8), practical design notes, and a parameter comparison table not bundled together on the manufacturer's product page.
PCA82C251T-YM118 - 24V CAN Transceiver, 1Mbps, SOIC-8 | NXP
The NXP PCA82C251T-YM118 is a legacy CAN bus transceiver for 24 V systems, providing the physical interface between a CAN protocol controller and the differential CAN bus. Housed in an 8-pin SO (SOIC-8) surface-mount package, it supports data rates up to 1 Mbps and operates from a single 5 V supply (4.5 V to 5.5 V), with bus pins tolerant to ±27 V of common-mode voltage for harsh 24 V automotive and industrial environments. A CAN transceiver (Controller Area Network transceiver) is a physical-layer device that converts the digital transmit/receive logic of a CAN protocol controller into the differential voltage signaling required by the CAN bus standard (ISO 11898). Within the broader system hierarchy, a CAN transceiver sits between the protocol controller (MCU) and the physical wiring harness, and belongs to the family of differential line drivers / interface ICs / wired-connectivity semiconductors. The 82C251 is the third-generation "PCA82C251" device, designed for 24 V truck and bus applications and predates the modern TJA1050 / TJA1042 / TJA1051 family. Key features include ±27 V bus fault protection on CANH and CANL, thermal shutdown with automatic recovery, a current-limited transmitter for short-circuit protection on the bus, and a low-current standby mode (typ. 275 µA supply current per Mouser listing). The differential receiver provides high common-mode rejection, and the driver stage supports slew-rate-limited transmission at speeds up to 1 Mbaud. The device exposes TxD, RxD, VCC, GND, CANH, CANL, Vref, and Rs pins on the SO-8 footprint. The architecture uses a bipolar process optimized for high bus voltage tolerance, with on-chip protection diodes clamping transient voltages beyond the supply rails. The Rs pin selects between high-speed, slope-control, and standby modes, providing a software/hardware mechanism for EMC tuning or low-power operation when the bus is idle. Typical applications include 24 V truck and bus CAN nodes, industrial CANopen networks, automotive body and chassis ECUs, agricultural machinery telemetry, and marine electronics. It is a pin-compatible second-source for the legacy PCA82C251 footprint, useful when modern 12 V TJA parts are not suitable. When designing with this part, place a 100 nF decoupling capacitor close to the VCC pin and use a split termination (60 Ω + 60 Ω + 100 nF to ground) at each end of the CAN bus for proper 24 V signal integrity. The Rs pin mode selection must be configured via a resistor to ground or to VCC; leaving it floating is not recommended. The PCA82C251T is marked NRND by NXP - prefer the TJA1051T or TJA1057T for new designs, but this part remains in production for legacy 24 V applications. This page synthesizes distributor stock, parametric data, drop-in second sources, and application guidance drawn from NXP's PCA82C251 datasheet plus current distributor inventory, not all of which appears in a single manufacturer PDF.
PCA82C251T/N3,118 - 24V CAN Transceiver SOIC-8 | NXP
The NXP PCA82C251T/N3,118 is the interface between a CAN protocol controller and the physical bus, primarily intended for applications up to 1 MBaud in 24 V truck and bus systems. It provides differential transmit capability to the bus and differential receive capability to the CAN controller and is fully compatible with the ISO 11898-24 V standard. The /N3,118 suffix denotes the SOIC-8 (D-package) tape-and-reel delivery option used for high-volume automated assembly. A CAN transceiver (Controller Area Network transceiver) is a physical-layer IC that converts the digital transmit (TXD) and receive (RXD) signals of a CAN protocol controller into the differential CANH and CANL bus signals, and vice versa. Within the broader hierarchy, a CAN transceiver is a type of bus transceiver, which is a type of interface IC, which sits inside the Interface ICs category of integrated circuits. The PCA82C251 family targets 24 V automotive and industrial systems where high bus robustness and good electromagnetic compatibility are required. Key features include a -27 V to +40 V bus fault tolerance on CANH/CANL, thermal shutdown protection, current limiting on the transmitter outputs, and a slope-control pin that lets the user programme the bus rise/fall time. The IC operates from a single 4.5 V to 5.5 V supply, draws a typical quiescent current of 16 mA in recessive mode, and survives automotive transients on the bus lines. The SOIC-8 plastic package offers a small PCB footprint with a standard 1.27 mm pin pitch. Typical applications include 24 V truck and bus CAN nodes, industrial CANopen networks, agricultural and construction machinery, and any 12 V or 24 V CAN bus node requiring the classic PCA82C251 silicon. The PCA82C251 is the second-generation PCA82C250 follow-on and is widely second-sourced across the industry. Note that NXP has moved this part to NRND (Not Recommended for New Designs) - new designs should evaluate TJA1043, TJA1051, or TJA1042 for similar 24 V capability. When designing with this part, place a 100 nF decoupling capacitor as close as possible to pin 8 (VCC) and follow the ISO 11898 bus termination of 120 Ω at each end of the bus. The slope-control resistor on pin 8 (Rs) must be chosen against the desired bit rate; for 1 MBaud operation NXP recommends tying Rs to ground, while for lower bit rates a larger resistor reduces EMI. This page synthesises distributor stock, drop-in equivalents, and design guidance not found in the standalone datasheet PDF.
PCA82C251T/YM,112 - CAN Transceiver for 24V Systems | NXP
The NXP Semiconductors PCA82C251T/YM,112 is a legacy Controller Area Network (CAN) transceiver for 24 V systems, supplied in an 8-pin SOIC package (SOT96-1 / SO-8). The device provides a single differential transmit driver and a single differential receiver, providing the physical interface between a CAN protocol controller and the differential CAN bus. It operates from a single 4.5 V to 5.5 V supply, supports data rates up to 1 Mbaud, and is fully compatible with the ISO 11898-24 V standard. What is a CAN transceiver? A CAN transceiver (Controller Area Network transceiver) is a physical-layer interface IC that bridges a digital CAN protocol controller — typically a microcontroller with a built-in CAN module — and the differential CAN bus wiring found in vehicles, industrial equipment, and factory automation systems. Within the broader semiconductor hierarchy, a CAN transceiver belongs to the Interface ICs family, which sits inside the Integrated Circuits product tree. It is the companion IC to a CAN controller, the safety/transceiver side of an automotive/industrial bus, providing the differential drive strength, common-mode tolerance, and bus-fault robustness that digital logic alone cannot deliver. Key features of the PCA82C251T/YM,112 include slope-control to reduce Radio Frequency Interference (RFI), thermal shutdown protection, short-circuit protection on the bus pins, and an exposed thermal pad-friendly SO-8 footprint. The transceiver provides recessive and dominant bus states compliant with ISO 11898-24 V, can detect a permanent dominant condition on the bus, and includes a low-current standby mode controlled via the Rs (slope / standby) pin. The bus pins (CANH, CANL) survive load-dump transients encountered in 12 V and 24 V automotive/industrial environments, making the part the workhorse interface for truck, bus, agricultural, and off-road vehicle networks. Internally, the PCA82C251T/YM,112 uses a bipolar transmitter architecture with a precision differential output stage. The slope-control pin (pin 8) lets the designer trade edge rate against RFI; slower edges reduce emissions on unshielded bus cabling at the cost of maximum achievable bit rate. The receiver compares the bus differential voltage against an internal reference with sufficient hysteresis to reject common-mode noise, and the TXD input feeds a dominant/recessive driver that pulls the bus to the ISO 11898-24 V defined levels. A thermal shutdown block protects the output stage against continuous short circuits on CANH or CANL. Typical applications include in-vehicle CAN networks for trucks, buses and agricultural machinery, industrial automation CAN nodes, building automation (HVAC, lifts), and any 24 V battery-powered CAN segment requiring compliance with ISO 11898-24 V. Designers pair the PCA82C251T/YM,112 with microcontrollers that include a CAN controller (such as NXP LPC, S32K, or Kinetis families) and external protection components (TVS diodes, common-mode chokes) on the bus side. When designing with this transceiver, fit a split-termination network (typically 60 Ω total with a 10 nF to 100 nF capacitor to ground) close to the bus pins to match the cable impedance and improve EMC. Slope-control resistance should be chosen to keep edge times short enough for the target baud rate while still meeting automotive EMC limits. Ensure the supply is decoupled with a 100 nF ceramic capacitor placed within a few millimeters of the VCC pin. This page synthesizes NXP datasheet specifications, distributor pricing as of 2026-10-13, drop-in alternatives (same-brand first, then cross-brand), and practical design notes not found in the standalone datasheet to give engineers an actionable component reference.
PCA8574D,512 - 8-Bit I2C I/O Expander 400kHz SOIC-16 | NXP
The NXP PCA8574D,512 is a remote 8-bit I/O expander for the I2C-bus with interrupt output, providing eight quasi-bidirectional general-purpose I/O lines in a 16-pin SOIC (SO16) package. It operates from a single 2.3V to 5.5V supply, supports the Fast-mode 400 kHz I2C bus, and offers three hardware address pins (A0, A1, A2) plus an open-drain active-low interrupt output. An I2C I/O expander is a type of interface IC that lets a microcontroller control additional digital inputs and outputs through the two-wire serial bus (SCL and SDA), reducing the number of GPIO pins the MCU itself must provide. Within the interface IC hierarchy, the PCA8574 sits alongside I2C multiplexers, port expanders and level translators, and is a direct successor in function to the industry-standard PCF8574. Key features include eight quasi-bidirectional ports that can be independently assigned as inputs or outputs, a 400 kHz I2C-bus interface, low standby current of approximately 10 uA, an latched outputs architecture with power-on reset, and an open-drain INT output that notifies the host of any input change. The quasi-bidirectional I/O structure allows a pin to be used as input or output without direction-control registers, simplifying firmware. The three hardware address pins allow up to eight PCA8574 devices (or eight PCA8574A devices with the alternate fixed slave address) on one bus, supporting up to 16 expanders and 128 I/Os, for example 128 LEDs, from a single two-wire bus. Latched outputs directly drive LEDs with high current sink capability. Typical applications include keypads and switch matrices, LED and indicator driving in white goods and industrial control panels, SPDT relay expansion, sensor monitoring in battery-powered products, and remote I/O expansion in automotive body electronics. For design, remember the quasi-bidirectional ports sink strongly but source only weakly (approximately 100 uA at VDD = 5V), so use external pull-ups on input lines and drive LEDs in sink mode. This page synthesizes distributor pricing, verified drop-in alternatives, practical design notes, and EOL lifecycle guidance not found in the manufacturer datasheet alone.
PCA8574D-T - 8-Bit I2C I/O Expander 400kHz | NXP
The NXP PCA8574D-T is a remote 8-bit I/O expander for the I2C-bus with interrupt output, housed in a 16-pin SO16 (SOIC) package, operating at up to 400 kHz Fast-mode I2C. It provides general-purpose quasi-bidirectional I/O expansion for most microcontroller families via the two-line bidirectional I2C-bus (serial clock SCL and serial data SDA). An I/O expander is a type of interface IC within the broader hierarchy of interface and connectivity semiconductors. It allows a microcontroller with limited GPIO pins to control additional digital inputs and outputs over just two bus lines, reducing pin count, board space, and wiring complexity. I/O expanders are common companions to MCUs such as those from NXP, STMicroelectronics, and Microchip in embedded systems. Key features of the PCA8574D include an 8-bit quasi-bidirectional port with latched outputs, an open-drain interrupt (INT) output that alerts the host controller to remote input changes, and three hardware address pins (A0, A1, A2) that allow up to eight PCA8574 devices on the same I2C-bus. Combined with the PCA8574A variant (different fixed slave address), up to 16 devices can share one bus, supporting up to 128 I/Os, for example driving 128 LEDs. Architecturally, the device integrates an 8-bit quasi-bidirectional I/O port, an I2C-bus slave interface with Fast-mode 400 kHz support, and power-on reset logic that sets all ports to a defined state at startup. The quasi-bidirectional structure means each pin can serve as input or output without a direction-control register, simplifying firmware. Typical applications include keypad scanning and keyboard interfaces, LED and indicator driving, backplane status monitoring in industrial systems, and general-purpose GPIO expansion in automotive body electronics and consumer appliances. Design consideration: quasi-bidirectional pins source a weak holding current when set high, so external loads must sink current to pull a pin low; check sink capability per the manufacturer datasheet before driving heavier loads. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
PCA8575PW,118 - 16-bit I2C I/O Expander TSSOP-24 | NXP
The NXP Semiconductors PCA8575PW,118 is a remote 16-bit I/O expander for the I2C-bus (SCL/SDA), providing a 16-bit quasi-bidirectional parallel port and an interrupt output, housed in a 24-pin TSSOP (4.4 mm body width) surface-mount package and supplied on Digi-Reel. The device supports a supply range of 2.3 V to 5.5 V and operates at an I2C clock frequency up to 400 kHz (Fast-mode), making it drop-in compatible with the wide majority of 3.3 V and 5 V microcontroller I2C peripherals. An I/O expander is a bus-attach peripheral that multiplies a host controller's general-purpose I/O count by adding parallel input/output pins over a serial link. The PCA8575PW,118 belongs to the I2C-bus I/O expander family (I/O expander -> GPIO expander -> parallel I/O port -> interface IC -> integrated circuit). Quasi-bidirectional outputs can be driven low actively by the device or pulled high weakly, which lets a single pin directly sink LED current when configured as an output and still be read as a logic high when the external driver releases the line - useful for keypad scanning and switch-matrix polling. Key features include 16 individually addressable I/O lines, an open-drain interrupt (INT) line that asserts when any input changes state, three hardware address pins (A0/A1/A2) allowing up to eight devices on one bus (128 I/O total), latched outputs with high-current drive capability suitable for direct LED driving, and a low standby current that suits battery-powered designs. The integrated address decoder, input filter, and edge-triggered interrupt block reduce host firmware overhead because the MCU only services the PCA8575PW,118 when an actual port event occurs. Typical applications include adding pushbuttons, keypads, LED indicators, relay drivers, and sensor multiplexing to 8-pin microcontrollers, white-goods and appliance front panels, industrial PLC I/O modules, and PC accessory sideband ports. The 400 kHz Fast-mode I2C clock and 2.3 V to 5.5 V supply let it interface directly with 3.3 V ARM Cortex-M parts and 5 V legacy MCUs without level translation. When designing with this device, place the standard 100 nF VCC bypass within 5 mm of the supply pin and add 10 kohm pull-ups on SDA and SCL - quasi-bidirectional outputs still require external pull-ups to drive logic high reliably. Reserve the INT pin for an MCU edge-triggered input and avoid tying it permanently high; the address pins A0-A2 must be tied to a fixed logic level and not left floating at power-up. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the NXP datasheet alone, including the comparison and pinout data that engineering teams need to qualify a second source.
PCA9306H - Dual I2C/SMBus Voltage-Level Translator | TI
The Texas Instruments PCA9306H is a dual bidirectional I2C-bus and SMBus voltage-level translator with an enable (EN) input, operating from 1.2 V to 3.3 V on VREF1 and 1.8 V to 5.5 V on VREF2, housed in an 8-pin VSSOP (DCT) package. It translates between two voltage domains without a direction pin, making it a compact solution for mixed-voltage I2C and SMBus networks. A voltage-level translator is an interface IC that safely connects digital signals operating at different supply voltages, for example a 1.8 V microcontroller I2C peripheral talking to a 3.3 V or 5 V sensor. Within the signal-chain hierarchy, the PCA9306H belongs to the level-translator family of interface ICs, positioned alongside I2C buffers, repeaters, and multiplexers. Because I2C is an open-drain bus, translation requires a bidirectional pass element rather than a directional buffer - exactly the architecture this device implements. Key features include directionless bidirectional translation, an enable pin that puts both switch channels into a high-impedance state when LOW, and low ON-state resistance of the pass FET, which keeps propagation delay minimal. The wider VREF1 range of the PCA9306H (1.2 V to 3.3 V, versus 1.0 V to 3.6 V or lower-floor variants in the family) makes it suitable for modern low-voltage processors. It supports standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode plus (1 MHz) I2C devices as well as SMBus systems. Architecturally, the device is a pair of N-channel pass transistors with gate drive referenced to EN and the reference supplies. When EN is HIGH, SDA1/SCL1 connect to SDA2/SCL2; pulling either side low through its open-drain pull-up propagates the low to the other side, achieving the gate-threshold offset that produces the voltage shift. Because there is no active buffering, signal integrity is essentially transparent, with propagation delay dominated only by the switch Ron and external pull-up resistors. Typical applications include connecting 1.8 V MCUs to 3.3 V or 5 V sensors and EEPROMs, translating between 3.3 V SMBus hosts and lower-voltage peripherals in servers and networking cards, and interfacing low-voltage FPGA or SoC I2C banks to 5 V legacy buses in industrial control systems. For reliable operation, size the pull-up resistors on both sides of the translator according to the bus speed and bus capacitance; each side must have its own pull-up. Also note the 200 kOhm internal pass-gate resistance behavior at low VREF2 voltages when calculating rise times. This page synthesizes distributor data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
PCA9306USG - Dual I2C/SMBus Voltage-Level Translator | onsemi
The onsemi PCA9306USG is a dual bidirectional I2C-bus and SMBus voltage-level translator with an enable (EN) input, operating from 1.2 V to 3.3 V VREF1 and 1.8 V to 5.5 V VREF2, delivering 1.5 ns typical propagation delay and 3.5 ohm ON-state resistance in an 8-pin VSSOP (US8) package. A voltage-level translator is an interface IC that allows devices operating at different supply voltages - for example a 1.8 V microcontroller and a 5 V sensor - to share the same two-wire bus safely. Within the signal-chain hierarchy, level translators sit in the interface IC family alongside I2C multiplexers, buffers, and repeaters. The PCA9306 belongs to the switch-based (passive) translator class: it uses two N-channel pass transistors per channel rather than active output stages, so the bus is pulled up naturally by the resistors on each rail. Key features include bidirectional voltage translation between 1.2 V and 5 V with no direction pin, support for Standard-mode (100 kbps), Fast-mode (400 kbps), and Fast-mode Plus (1 Mbps) I2C-bus plus SMBus operation, a very low 3.5 ohm ON-state connection that minimizes signal distortion, and an active-high EN input that isolates both buses when the translator is not needed. The 1.5 ns rise/fall propagation characteristic keeps bus timing margin intact even at Fast-mode Plus speeds. The switch architecture means the PCA9306 introduces virtually no drive strength of its own - the 64 mA figure refers to the pass-transistor current handling capability. Because it is a passive switch, lock-up free operation is guaranteed even during bus contention or partial power-down, a known failure mode of active level-shifter designs. Both SDA and SCL channels are identical, so the device handles the full 2-bit I2C bus in a single package. Typical applications include connecting 1.8 V to 3.3 V microcontrollers to 5 V I2C sensors and EEPROMs, level-shifting SMBus rails in server power supplies, battery-powered portable systems where two rail domains must communicate, and mixed-voltage industrial control modules. Design consideration: the EN pin must be driven above the higher VREF2 rail to guarantee the pass gates turn fully on; always provide pull-up resistors on both sides of each channel sized for the respective rail. This page synthesizes distributor cross-reference data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing as of 2026-10-19.
PCA9500D - 8-Bit I/O Expander with EEPROM | NXP
NXP Semiconductors PCA9500D is an 8-bit I2C and SMBus I/O port expander with an onboard 2-kbit EEPROM, eight quasi-bidirectional GPIO pins, and operation up to 400 kHz in a 16-pin SOIC package. The expander adds remote status inputs and indicator or control outputs to a host microcontroller while preserving the familiar I2C two-wire interface. An I2C I/O expander is a bus-interface peripheral that converts serial commands from a controller into parallel digital states. In the broader hierarchy, it belongs to interface ICs, digital I/O control, and general-purpose bus peripherals. The PCA9500D combines an 8-bit quasi-bidirectional port with nonvolatile storage, allowing configuration or board-identification data to be retained between power cycles. The three address pins use internal pull-up resistors, allowing up to eight devices to share the common I2C bus. The GPIO address matches the PCF8574, while the EEPROM address matches the PCF8582C-2; consequently, one device appears as two separately addressed functions to the bus master. Its 400 kHz bus rating supports faster communication than the common 100 kHz I2C operating mode. Because each port pin can be assigned independently as an input or output, the device can monitor board-level status and activate indicators such as LEDs. The quasi-bidirectional structure is useful for straightforward bus interfacing, although external pull-ups, electrical-level compatibility, and the intended input or output state must be considered in each design. Typical uses include industrial control boards, removable or backplane cards, LED and switch interfaces, configuration storage, and small embedded systems where GPIO conservation is valuable. The NXP product information specifically identifies hot-insertion support as useful in removable-card and backplane systems. A correct implementation should verify the actual device address, EEPROM map, logic thresholds, pull-up values, and pin functions against the manufacturer datasheet. Do not infer unavailable timing, voltage, temperature, or package dimensions from distributor summaries. For exact design values, consult the linked NXP documentation and validate firmware behavior across power-up, reset, bus faults, and hot-plug conditions.
PCA9500PW - 8-Bit I/O Expander with 2-kbit EEPROM | NXP
The NXP Semiconductors PCA9500PW is an 8-bit I2C-bus and SMBus I/O port expander with an integrated 2-kbit EEPROM in a 16-pin TSSOP package. It operates from 2.5 V to 3.6 V, supports I2C/SMBus communication up to 400 kHz, and provides eight quasi-bidirectional data pins that can be configured independently as inputs or outputs. Three hardware address pins allow as many as eight PCA9500 devices to share one bus. According to the NXP datasheet, the bus master sees the GPIO controller and EEPROM as two separate devices, while the GPIO configuration register is accessed in a manner similar to the PCF8574. An I/O expander is a general-purpose interface IC that increases the number of digital input and output lines available to a host microcontroller without requiring a large parallel GPIO package. In the product hierarchy, the PCA9500 is an I/O expander within the broader category of interface ICs and bus-interface semiconductors. Its quasi-bidirectional ports can read external logic states or drive indicators and other digital loads, making it useful when the main processor has too few general-purpose pins for switches, sensors, LEDs, or control signals. The principal feature is the integrated 2-kbit EEPROM, which adds a small amount of nonvolatile storage for configuration or identification data. The eight GPIO pins support mixed input/output operation, and the three address inputs expand the device count available on a shared I2C or SMBus system. A maximum bus rate of 400 kHz is suitable for standard embedded control buses, while the 2.5 V to 3.6 V supply range targets conventional low-voltage digital systems. The NXP datasheet identifies the PCA9500 as a drop-in replacement for the PCF8574, adding EEPROM functionality to a familiar interface arrangement. The PCA9500 uses the same basic I2C write/read model commonly associated with PCF8574-style devices. Separate device addresses allow the GPIO function and the EEPROM to be accessed independently by the bus master. This separation is useful when the host must read or update stored data without changing live output states. Quasi-bidirectional inputs include an internal pull-up arrangement, making the device convenient for open-drain-style bus signaling and for reading switches or logic states, although external pull-up and drive-strength checks remain important in the final circuit. Typical applications include consolidating LED indicators, reading banks of switches or interlocks, adding configurable control outputs to a microcontroller module, and storing board configuration or asset information in the EEPROM. It can also reduce controller pin count in compact embedded systems while preserving a standard I2C/SMBus connection. Eight address-selectable devices provide substantial expansion without requiring additional host pins. The primary design consideration is to treat the quasi-bidirectional pins as a bidirectional interface rather than as unrestricted push-pull outputs. Check pull-up strength, voltage levels, bus capacitance, and the timing requirements of every connected peripheral. Confirm the PCB land pattern and pin numbering against the manufacturer datasheet before production because the verified product information does not provide a complete public pin table in the supplied material. This page consolidates the verified NXP product information, distributor identification, lifecycle status, bus characteristics, and manufacturer-backed drop-in relationships into an engineering-focused resource. It also distinguishes verified capabilities from parameters that still require confirmation from the full manufacturer datasheet.
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.
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.
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.
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).
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.
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.
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.
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.