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TCA0372DP1

TCA0372DP1 - 1A Dual Power Operational Amplifier | onsemi

onsemi TCA0372DP1 is a dual-channel power operational amplifier intended for high-current amplifier stages, servo amplifiers, power supplies, and inductive loads. The device operates from a 5 V to 40 V supply range, provides output current up to 1.0 A, and uses a 1.4 MHz gain-bandwidth product. It is packaged in an 8-pin PDIP. Its monolithic power-output stage is designed to reduce crossover distortion when driving coils, making the TCA0372DP1 useful in systems where conventional small-signal operational amplifiers cannot deliver adequate load current. A power operational amplifier is an operational amplifier integrated with an output stage capable of supplying substantially more current than a conventional precision amplifier. This places the device within the hierarchy of operational amplifier, linear amplifier, analog signal amplifier, and integrated circuit. Unlike a switching regulator, the TCA0372DP1 amplifies an analog error or control signal while maintaining continuous conduction. Its power-output capability allows one dual amplifier package to serve both error amplification and high-current drive functions in feedback-controlled systems. The primary headline characteristics are a 1.0 A maximum output current, a 5 V to 40 V operating supply range, and a 1.4 MHz gain-bandwidth product. The dual configuration provides two amplifier channels in one package, reducing board area in multi-axis servo or dual-channel drive systems. The lack of dead-band crossover distortion is particularly relevant when driving inductive coils because it avoids the command dead zone commonly introduced by power-output stages that switch between positive and negative drive states. The TCA0372 is a monolithic circuit, allowing its internal drive and amplifier sections to share a common package and support direct analog feedback-control operation. In a typical servo amplifier, an external position or speed loop generates a command voltage, and the TCA0372 channel amplifies that command into a motor-drive signal. Feedback from the actuator closes the loop. The wide operating-voltage range also permits use with higher-voltage power systems when the remaining input, output, and thermal requirements are satisfied. Typical uses include servo-amplifier output stages, closed-loop motor controllers, industrial actuator drivers, power-supply error amplifiers, and other systems that require analog feedback with a high-current output. For AC or bipolar drive arrangements, the external network must handle the required current and voltage excursions without exceeding the device's electrical limits. Heat management and output-stage stability are important when continuous load operation approaches the output-current rating. Circuit implementation should preserve the feedback connection at the amplifier output and minimize PCB-trace resistance between the power-output pins and the load. Input and output decoupling should follow the manufacturer's recommended application circuit. Because the amplifier dissipates power internally, designers should calculate worst-case output dissipation, provide adequate copper area, and verify that the ambient temperature and load waveform keep junction temperature within the qualified operating range. This product page combines the exact TCA0372DP1 electrical and package identifiers with datasheet references, application guidance, and a package-aware comparison. It also distinguishes documented functions from parameters requiring confirmation in the manufacturer datasheet. The result is a practical engineering reference for evaluating whether this dual, high-current operational amplifier matches a servo, power-supply, or inductive-drive design without confusing it with a switching power converter.

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TCA0372DP2

TCA0372DP2 - 1A Dual Power Op Amp | onsemi

onsemi TCA0372DP2 is a dual power operational amplifier delivering up to 1.0 A output current and operating from a 5 V to 40 V supply in an 8-pin PDIP package. The monolithic device is designed for servo amplifiers, power supplies, and inductive loads, with no deadband crossover distortion to improve coil-drive performance. A power operational amplifier is a high-current linear amplifier that combines the gain and signal handling of a conventional operational amplifier with the ability to source or sink substantial load current. Within the amplifier hierarchy, it belongs to the power-amplifier class rather than the general-purpose low-current op-amp category. Its practical role is to turn a low-level control signal into a high-current drive for motors, solenoids, and other demanding loads. The TCA0372 family provides two independent amplifier channels, 1.0 A output-current capability per power-amplifier stage, and a 5 V to 40 V operating range. The absence of deadband crossover distortion is particularly useful when driving coils because the output crosses through zero more linearly than a conventional output stage with a dead region. This characteristic can reduce drive dead zone in bidirectional servo and actuator systems. The monolithic power-amplifier architecture supports relatively demanding loads without requiring a separate external power-transistor stage. Because the device combines amplification and current delivery in one package, the surrounding design must still account for supply decoupling, output-current limits, thermal dissipation, and protection against inductive voltage spikes. Its wide 40 V maximum supply rating provides useful headroom for industrial and automotive-style actuator systems. Typical applications include servo-amplifier loops, power-supply control stages, relay and solenoid drivers, motor-control systems, and other inductive or high-current loads. The dual-channel configuration can also support two coordinated actuator channels or one control function plus a complementary auxiliary function, subject to the applicable electrical and thermal limits. For a new design, preserve adequate supply decoupling near the device, verify the continuous and peak current requirements of the connected load, and provide suitable flyback protection for inductive loads. The through-hole PDIP package is straightforward for prototype and legacy industrial assemblies, although a surface-mount power-amplifier option may be preferable for compact production hardware. This product overview combines the confirmed 1.0 A current, 5 V to 40 V supply range, dual-channel architecture, no-deadband feature, and PDIP-8 format with practical guidance for amplifier selection, PCB implementation, thermal review, and drop-in replacement assessment.

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TCA0372DW

TCA0372DW - Dual 1A Power Op Amp | onsemi | 16-SOIC

onsemi TCA0372DW is a dual power operational amplifier with 1.0 A output current, a 5 V to 40 V operating range, and a 16-lead SOIC package. The device is intended to amplify low-level error signals directly into high-current loads without adding a separate power-output stage. Its dual-circuit configuration allows two independent power-amplifier channels within one package, reducing board area in multi-axis motion, audio, and power-control systems. A power operational amplifier is a specialized operational amplifier that combines high-voltage signal handling, low-voltage input amplification, and current-drive capability. Within the product hierarchy, it belongs to the operational-amplifier family, amplifier IC family, analog signal-conditioning category, and broader semiconductor category. Unlike a conventional small-signal operational amplifier, the TCA0372 is designed to drive coils, motors, and other loads that require substantially more output current than a standard op amp can supply. The principal verified features include 1.0 A output current, dual power-amplifier operation, a 5 V to 40 V supply range, and operation without deadband crossover distortion. The absence of deadband crossover distortion is especially relevant when the amplifier drives coils because it avoids the output transition region that can introduce nonlinear behavior around zero. According to the onsemi manufacturer datasheet, the monolithic circuit is intended for power supplies and servo amplifiers as well as coil-driving applications. The TCA0372 integrates input amplification and power-output capability in one monolithic device, reducing the number of external drive stages required in a power-control design. Two amplifiers are provided in the package, allowing a dual-axis actuator system or two independent power channels to share one 16-SOIC package. Its wide 5 V to 40 V operating range supports applications operating from conventional industrial rails through higher-voltage motor-control systems. Typical uses include DC servo amplifiers, closed-loop position and speed control, audio power stages, industrial actuator drivers, and power-supply error amplifiers. In a servo loop, the TCA0372 can convert a low-level feedback error into a high-current motor command. For audio, its dual-channel organization can support left and right channels when the load and thermal conditions permit. In power supplies, its output current and high-voltage capability can drive suitable external stages when the required operating point remains within the datasheet limits. Designers should verify the complete electrical characteristics, pin connections, thermal limits, and output-stage behavior in the onsemi datasheet before layout. Decoupling must minimize output-stage transients and supply noise, while PCB copper and thermal design must accommodate dissipation during sustained high-current operation. The 16-pin SOIC footprint also requires adequate spacing from heat-generating components because its relatively small lead frame can limit heat dissipation. This product record combines verified manufacturer and distributor information, same-family replacement analysis, parameter-level comparison, and practical engineering guidance. It distinguishes confirmed TCA0372DW facts from specification fields that were not supplied in the retrieved data, helping engineers make evidence-based sourcing and design decisions.

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TCA0372DWG

TCA0372DWG - 1A Dual Power Op Amp | onsemi | 16-SOIC

The onsemi TCA0372DWG is a dual power operational amplifier with 1.0 A output current, a 5 V to 40 V operating supply range, and a 16-pin SOIC package. Designed for power-buffer, servo-amplifier, power-supply, and coil-driving applications, the device combines two amplifiers in one package while supporting output currents of 1.0 A. A power operational amplifier is a high-current amplifier that sits between a low-power control signal and a load such as a motor, solenoid, actuator, or power-conversion stage. It belongs to the operational-amplifier hierarchy, amplifier family, and broader analog and power-management semiconductor categories. Unlike a conventional low-current signal op amp, a power op amp is intended to provide substantially greater load-driving capability while preserving closed-loop control of voltage or current. Key characteristics of the TCA0372DWG include 1.0 A output current, a 1.4 MHz gain-bandwidth product, and a 1.3 V/µs slew rate. Its operating supply range extends from 5 V to 40 V, making it appropriate for industrial, audio, servo, and power-control systems that operate above conventional ±15 V laboratory supply levels. The device also uses a no-deadband output architecture, which improves behavior when driving inductive coils. The TCA0372 is a monolithic dual circuit, allowing independent use of the two amplifier sections when their supply and thermal requirements permit. Its 1.4 MHz bandwidth supports applications requiring more bandwidth than a slow power-buffer stage while its 1.3 V/µs slew rate provides comparatively fast voltage transitions. These characteristics make it suitable for audio power stages, servo loops, motor-control paths, and power-supply control loops. Typical applications include servo amplifiers, regulated power supplies, audio amplifiers, motor drivers, actuator controllers, and coil drivers. The 1.0 A output capability is important when the load draws substantially more current than a standard precision op amp can deliver. Designers should still evaluate the SOA limits, supply capability, output saturation, load impedance, and thermal dissipation for the exact operating conditions. For reliable layout, keep feedback and compensation components close to the amplifier pins, provide robust supply decoupling, and use a PCB copper area that can remove heat generated at high output current. Avoid driving the output into excessive capacitive loads, and include current limiting or protection where the connected coil or actuator can present an unusual startup transient. This product data consolidates the manufacturer specifications, package information, sourcing details, same-family alternatives, comparison parameters, and practical design guidance into an engineering-oriented reference for selecting and implementing the TCA0372DWG.

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TCA1116PWR

TCA1116PWR - 16-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments TCA1116PWR is a low-voltage 16-bit I2C and SMBus parallel I/O expander with interrupt and reset functions, operating at up to 400 kHz in a 24-pin TSSOP package. Its 16 configurable ports expand a host controller's digital input and output capacity while preserving a compact serial-bus architecture. The device supports 1.65 V to 5.5 V operation, 5 V-tolerant I/O, and 1.8 V I2C operation. An I/O expander is an interface IC that translates serial I2C commands into parallel digital signals. It sits between a microcontroller or other host controller and external switches, sensors, indicators, or logic inputs. The TCA1116PWR belongs to the I/O expander category, the interface IC category, and the broader semiconductor hierarchy. Its purpose is to reduce the number of GPIO pins required by embedded systems while allowing the added ports to be addressed through the I2C bus. Key features include 16 independently usable I/O ports, 400 kHz serial-bus operation, an active-low open-drain interrupt output, and an active-low reset input. The I/O pins tolerate 5 V signals, while the SDA and SCL inputs remain 5 V tolerant during partial power-down with less than 1 uA of leakage even when VCC is zero. These features allow mixed-voltage interfaces and controlled shutdown behavior in compact embedded systems. The TCA1116PWR is designed for systems in which a host needs more parallel lines than its controller provides. Two programming interfaces can address the expander, and its address inputs support placing multiple devices on one bus. The interrupt output allows the controller to avoid continuous polling when a connected peripheral changes state. Reset provides a defined startup state for the ports and helps simplify firmware initialization across a multi-device system. Typical uses include industrial control modules, building-automation interfaces, sensor aggregators, programmable logic controllers, LED and relay monitoring, test equipment, and embedded human-machine interfaces. In a sensor aggregation circuit, the host can configure input ports, read multiple digital signals, and use the interrupt line to request service only when a monitored event occurs. The TCA1116PWR is particularly useful where board area and host-controller pin count are constrained. When laying out the circuit, connect pull-up resistors to the appropriate I2C supply and keep SDA, SCL, and interrupt traces away from noisy switching nodes. Confirm the device address configuration and reset state in firmware, and account for the open-drain nature of the interrupt output when selecting its pull-up network. This page consolidates the device function, interface limits, package details, practical design guidance, and qualified drop-in comparison information to support faster component selection and PCB implementation.

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TCA3385-FP

TCA3385-FP Telephone Ring Signal Converter | Motorola

The Motorola TCA3385-FP is a telephone ring signal converter integrated circuit offered in a 16-pin SOG package. Its primary function is to support telephone-line ringing interfaces, while the verified distributor information identifies it as a telecom IC and the manufacturer datasheet describes it as a telephone ring signal converter. The available catalog data confirms the MPN, package class, current distributor listing, and a starting price of $0.6525 as of 2026-10-29. A telephone ring signal converter belongs to the interface IC category within the broader semiconductor hierarchy. Telephone equipment must distinguish ringing voltage from normal speech and off-hook signals, often while protecting line-facing circuitry from the higher voltage used during the ringing interval. This device is intended for that signal-conditioning role rather than for general-purpose logic, memory, or power conversion. Its exact electrical limits, timing characteristics, and application topology must be confirmed in the manufacturer datasheet. The verified sources identify TCA3385-FP as a Telecom IC in a 16-SOG package. LCSC lists the component as in stock with a starting price of $0.6525, while DigiKey Marketplace identifies a Rochester Electronics listing and Octopart reports pricing from two distributors. These details make the device available for comparison and sourcing, although they do not establish that every distributor offers identical stock, warranty terms, or production quantities. Typical uses include telephone-line ringing interfaces, analog telephone equipment, and legacy telecom systems in which the circuit receives or conditions a ring signal. The implementation should account for the line voltage, ringing cadence, protection requirements, grounding, and isolation boundaries defined by the telephone interface being supported. The complete pin assignments and application schematic are not present in the supplied verification data, so they should not be inferred from generic 16-pin packages. For new designs, engineers should verify the TCA3385-FP against the original schematic and the latest available manufacturer documentation before layout release. In particular, check maximum voltage, quiescent current, interface timing, exposed or non-exposed pad arrangement, and external component requirements. Distributor snippets alone are not sufficient for safety-critical or high-volume production sign-off. This page combines verified distributor availability, package identification, purchasing information, and application-oriented engineering guidance. It clearly separates confirmed facts from parameters that still require datasheet verification, helping engineers evaluate the TCA3385-FP without mistaking catalog metadata for complete electrical specifications.

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TCA355GXK

TCA355GXK - Capacitive Touch Proximity Sensor | Infineon

Infineon Technologies TCA355GXK is a capacitive touch proximity sensor integrated circuit offered in an 8-pin SOIC package. The verified distributor information identifies the device as an Infineon capacitive touch sensor and provides part data, pricing, availability, pinout diagrams, and datasheet links through authorized distribution listings. Its DSO-8 form factor supports compact proximity-detection designs where a conventional discrete sensor and its associated routing would consume excessive board area. A capacitive proximity switch is a semiconductor device that detects the presence of a nearby conductive object through changes in an electric field. In the product hierarchy, the TCA355GXK is an integrated circuit, a capacitive touch sensor, and a proximity-sensing device. Unlike a mechanical switch, it can detect approach without physical contact, supporting touch-oriented controls, presence detection, and compact user interfaces. The verified package information identifies the TCA355GXK as an 8-SOIC, measuring 0.154 inch or 3.90 mm in width. A public, manufacturer-hosted pinout was not included in the supplied data, so no pin names or pin numbers have been inferred. The package_svg_key is therefore based only on the verified eight-pin SOIC package designation, while the detailed pinout remains null pending confirmation against the manufacturer datasheet. Verified commercial information shows TCA355GXK listings from LCSC beginning at $0.7758, an icDirectory listing at $1.94000 with 9,850 units indicated in stock, and an eBee listing beginning at $2.4325. Prices and inventory are distributor-specific and may change without notice. Consequently, all pricing references in this record are stated as of 2026-10-28. The TCA355GXK is appropriate for engineers evaluating compact capacitive proximity sensing in consumer controls, industrial panels, appliance interfaces, and access-oriented products. Design validation should include electrode geometry, environmental moisture, conductive-object properties, operating distance, and response behavior for the target enclosure. Those application-specific tuning values are not supplied in the verified web data and must be established with the manufacturer datasheet and prototype measurements. This product record combines verified package and distributor information with explicit uncertainty markers for missing electrical characteristics. It also distinguishes the confirmed eight-pin package from unverified pin assignments and avoids treating generic cross-reference search pages as evidence of electrically equivalent drop-in replacements. Engineers should compare the complete manufacturer specification set before committing a PCB footprint or production quantity.

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TCA39306DCURQ1

TCA39306DCURQ1 - Dual I2C/I3C Level Translator 12.5MHz | TI

The Texas Instruments TCA39306DCURQ1 is an automotive-qualified dual bidirectional voltage-level translator compatible with I2C, SMBus, and I3C buses, featuring an enable (EN) input and packaged in an 8-pin VSSOP (DCU) surface-mount package. It supports VREF1 from 0.9V to 3.3V and VREF2 from 1.8V to 5.5V, enabling bidirectional voltage translation between 0.85V and 5V rails without a direction pin, with a maximum data rate of 12.5MHz. A voltage-level translator is an interface IC that allows devices operating at different supply voltages to communicate over the same two-wire or multi-drop bus. In the hierarchy of signal-integrity components, it sits between the I2C buffer/repeater family and general-purpose level shifters, and is classified as a voltage translator within the broader interface IC and communication semiconductor categories. Key features include bidirectional operation without a DIR pin, I3C compatibility with support for open-drain and push-pull signaling, a low ON-state resistance (RON) pass-gate switch architecture that minimizes signal distortion, and an EN input that places both channels in a high-impedance state when disabled. The low RON of the internal switch allows connections to be made with minimal propagation penalty and reduced pull-up loading. Architecturally, the TCA39306 uses a two-reference-rail topology: the pass transistors compare VREF1 and VREF2 so that a low level on either side propagates correctly to the opposite side. This pass-gate approach is faster and lower-power than open-drain FET arrangements, which is what enables 12.5MHz (Fast-mode Plus and I3C-class) operation. Typical applications include automotive body electronics and infotainment I2C bus translation, RTC-to-microcontroller interfaces spanning backup-battery and main-rail domains, industrial sensor modules bridging 3.3V MCUs to 5V peripherals, and I3C sensor hubs. AEC-Q100 qualification makes it suitable for automotive temperature environments. Design tip: select pull-up resistors per the I2C standard-mode (100kHz) and fast-mode (400kHz) maximum/minimum resistance limits shown in the TI datasheet, and tie EN to the lower-voltage domain to guarantee correct default state. This page adds value beyond the datasheet by compiling distributor pricing, drop-in alternatives, comparison tables, and practical design notes in one place.

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TCA39306DDFR

TCA39306DDFR - Dual I2C/I3C Bidirectional Level Translator | TI

The Texas Instruments TCA39306DDFR is a 2-bit dual bidirectional voltage-level translator compatible with I2C, SMBus, and I3C (up to 12.5 MHz), operating from a 0.9 V to 3.3 V VREF1 rail and a 1.8 V to 5.5 V VREF2 rail, housed in an 8-pin TSOT-23-8 (DDF) surface-mount package. A voltage-level translator (also called a logic level shifter or voltage translator) is an integrated circuit that allows digital signals referenced to one supply domain to drive inputs in a different supply domain. Within the system hierarchy, level translators sit in the logic and interface IC family, bridging mismatched voltage domains between microcontrollers, sensors, and peripherals. Bidirectional translators such as the TCA39306 are essential for open-drain buses like I2C, where the same two wires (SDA and SCL) carry traffic in both directions. Key features include automatic bidirectional translation without a direction pin, support for Standard-mode (100 kbps), Fast-mode (400 kbps), and Fast-mode Plus (1 Mbps) I2C, plus I3C compatibility at 12.5 MHz, and an enable (EN) input for bus isolation. The low ON-state resistance (RON) of the internal pass-gate switches minimizes signal degradation and bus loading. Technically, the TCA39306 implements the reference-voltage biased switch architecture: VREF1 biases one side of the pass gate and VREF2 the other, so the open-drain pull-up levels define the translated logic levels. This pass-switch topology draws negligible static current and preserves I3C push-pull signaling on the SDA line, which open-drain-only solutions cannot support. Typical applications include mixed-voltage I2C bus segments (for example, a 1.8 V sensor side talking to a 3.3 V or 5 V controller side), SMBus systems in servers and power supplies, and emerging I3C peripherals in mobile and IoT designs. The tiny TSOT-23-8 footprint suits space-constrained board layouts. Design consideration: choose pull-up resistors on both sides appropriately - lower-value pull-ups (for example 1 kOhm to 4.7 kOhm) are needed for Fast-mode Plus and I3C rise-time compliance, while the EN pin can be driven to isolate the bus during reset sequences. This page synthesizes distributor pricing, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet.

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TCA39306DTMR

TCA39306DTMR - Dual I2C/SMBus/I3C Bidirectional Level Translator | TI

The Texas Instruments TCA39306DTMR is a dual (2-bit) bidirectional voltage-level translator for SDA and SCL lines in mixed-voltage I2C, SMBus, and I3C applications, supporting VREF1 from 0.9V to 3.3V, VREF2 from 1.8V to 5.5V, and translations between 0.85V and 5V, housed in an 8-pin X2SON (1.35mm x 0.8mm) package with tape-and-reel delivery. A voltage-level translator is a logic-family interface IC that bridges digital signals between circuits operating at different supply rails, a member of the broader voltage-translation and logic-translation hierarchy within standard logic ICs. For open-drain buses such as I2C and SMBus, a bidirectional translator is required because data flows both ways on the same line without a direction-control pin; the TCA39306 solves this by using pass-gate switches with integrated pull-up references tied to each side's reference voltage. Key features include standard-mode (100 kbps), fast-mode (400 kbps), and fast-mode-plus (1 Mbps) I2C compatibility, I3C compatibility up to 12.5 MHz, an enable (EN) input for power sequencing and bus isolation, and very low ON-state resistance (RON) of the internal switches, which minimizes signal attenuation and allows external pull-up resistors to remain small. Because there is no direction pin, both channels (SDA and SCL) translate automatically as the bus arbitrates. Technically, the device uses two NMOS pass transistors per channel: when B-side is high, the switch conducts and the A-side tracks it; when A-side is pulled low, the switch passes the low level through. The EN pin must be driven to VREF1 for normal operation and can be grounded to place the bus in high-impedance, useful for hot-swapping and multi-master isolation. Typical applications include mixed-voltage MCU-to-sensor I2C links, server and industrial automation bus translation, and consumer electronics peripheral interfaces where a 1.8V controller must talk to a 3.3V or 5V peripheral. Design consideration: choose pull-up resistors for both rails carefully; smaller pull-ups speed rising edges but increase sink current through the internal switch, so follow the TI TCA39306 EVM User's Guide (SCPU045) guidance on load capacitance and pull-up selection. This page synthesizes distributor pricing context, drop-in alternative analysis, and practical design notes that go beyond the manufacturer datasheet.

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TCA4311ADR

TCA4311ADR - 2.7-5.5V I2C/SMBus Buffer | Texas Instruments

The Texas Instruments TCA4311ADR is a 2-bit bidirectional hot-swappable I2C/SMBus buffer operating from 2.7 V to 5.5 V, supporting bus frequencies up to 400 kHz in an 8-pin SOIC package. It buffers the SDA and SCL lines, increases bus fanout, and uses 1 V precharge on SDA and SCL to reduce corruption during live connections. The device is specified for temperatures from -40 °C to +85 °C. An I2C buffer, also called a bus buffer or bus repeater, is an interface IC placed between two bus segments. It reproduces the SDA and SCL signals in both directions so that bus capacitance, voltage-level differences, and long interconnect sections can be managed more effectively. In the broader hierarchy, the TCA4311ADR belongs to the I2C interface-controller, bus-buffer, interface-IC, and semiconductor categories. The principal features include bidirectional operation on both SDA and SCL, a 2.7 V to 5.5 V operating-power-supply range, and support for I2C/SMBus signaling at up to 400 kHz. Hot-swappable operation addresses systems in which a peripheral may be connected or disconnected while the bus remains active. The 1 V precharge feature helps limit signal corruption during those live insertion and removal events. The TCA4311ADR contains separate buffered paths for SDA and SCL, allowing two-wire bus segments to be isolated with respect to signal propagation and bus loading. Its 8-pin SOIC package is intended for surface-mount assembly. Because the device operates bidirectionally, the SDA and SCL connections must remain correctly terminated and must not introduce additional pull-up paths that exceed the design limits of the bus. Typical uses include hot-pluggable I2C peripherals, bus-isolation and level-translation interfaces, removable sensor modules, card-edge connections, and systems where one bus segment must connect to another without directly loading the entire bus. The 400 kHz operating limit also makes the device appropriate for standard fast-mode I2C equipment, including sensors, EEPROMs, and low-to-medium-rate control peripherals. Designers should account for the hot-swap path, external pull-up resistors, bus capacitance, and the voltage applied to each side of the buffer. Verify signal rise times at the intended bus frequency and ensure that powered-off or disconnected modules cannot back-power either bus segment. The manufacturer pin-description table should be used when assigning tracks and checking pull-up placement. This page combines the manufacturer product information, exact ordering information, supported operating limits, and cross-reference findings into a design-focused overview. It also identifies the limits of available replacement data so engineers can distinguish confirmed package and family options from candidates that still require independent pin-level and timing validation.

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TCA4311D

TCA4311D - 2.7-5.5V Hot-Swappable I2C Buffer | TI

The Texas Instruments TCA4311D is a 2-bit bidirectional, hot-swappable I2C/SMBus bus buffer operating from 2.7 V to 5.5 V at up to 400 kHz, and it is packaged in an 8-pin SOIC. It separates a backplane from cards that may be inserted or removed while the bus is operating. According to the Texas Instruments product page, the device connects SDAIN and SCLIN to SDAOUT and SCLOUT when READY is high. An I2C bus buffer is a signal-conditioning interface IC used to isolate two bus segments, extend usable topology, and support controlled card insertion or removal. In the device hierarchy, this function belongs to interface ICs and specifically to bidirectional bus buffers, repeaters, and accelerators. The TCA4311D supports both I2C and SMBus-style two-wire systems, where data and clock lines require buffering rather than unidirectional level translation. Verified headline features include a 2.7 V to 5.5 V operating range, 400 kHz operation, bidirectional signal paths, hot-swappable bus isolation, an enable control, and an open-drain READY output. The READY output indicates that the backplane and card sides are connected together. When EN is high, normal operation resumes; setting EN low places the device into shutdown mode while the I2C bus is idle. The I2C specification cited by Texas Instruments permits up to 400 pF maximum bus capacitance, which can constrain practical bus length. The SMBus specification does not impose that capacitance restriction, although connected-device impedances still limit how quickly the system can meet rise-time and fall-time requirements. Designers should therefore evaluate board capacitance, wiring, pull-ups, and connected-device loading rather than treating buffer insertion as a universal cure for bus-loading problems. Typical uses include server and desktop backplanes, plug-in acquisition modules, industrial control cards, communications equipment, and embedded systems where a card connects to an always-powered bus. The buffer is placed between the backplane pins and card-side pins, preserving independent local behavior on each side. System designers should verify idle-bus shutdown sequencing and interpret READY correctly before enabling the card interface. PCB layout should keep SDA and SCL routing compact, preserve the intended pull-up arrangement on each bus side, and provide the decoupling and grounding required by the manufacturer datasheet. Because the verified material does not expose complete electrical timing, current, capacitance, and pin-level limits in the supplied text, those values remain marked for data completion rather than being inferred. This page combines verified manufacturer and distributor information with design guidance, replacement analysis, and practical procurement context. It also distinguishes true pin-compatible alternatives from packaging-only orderable variants, helping engineers make evidence-based interface decisions.

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TCA4311DR

TCA4311DR - 2.7-5.5V Hot-Swappable I2C Buffer | TI (Tape & Reel)

The Texas Instruments TCA4311DR is a 2-bit bidirectional, hot-swappable I2C/SMBus bus buffer operating from 2.7 V to 5.5 V at up to 400 kHz, and it is packaged in an 8-pin SOIC. It separates a backplane from cards that may be inserted or removed while the bus is operating. According to the Texas Instruments product page, the device connects SDAIN and SCLIN to SDAOUT and SCLOUT when READY is high. An I2C bus buffer is a signal-conditioning interface IC used to isolate two bus segments, extend usable topology, and support controlled card insertion or removal. In the device hierarchy, this function belongs to interface ICs and specifically to bidirectional bus buffers, repeaters, and accelerators. The TCA4311DR supports both I2C and SMBus-style two-wire systems, where data and clock lines require buffering rather than unidirectional level translation. Verified headline features include a 2.7 V to 5.5 V operating range, 400 kHz operation, bidirectional signal paths, hot-swappable bus isolation, an enable control, and an open-drain READY output. The READY output indicates that the backplane and card sides are connected together. When EN is high, normal operation resumes; setting EN low places the device into shutdown mode while the I2C bus is idle. The I2C specification cited by Texas Instruments permits up to 400 pF maximum bus capacitance, which can constrain practical bus length. The SMBus specification does not impose that capacitance restriction, although connected-device impedances still limit how quickly the system can meet rise-time and fall-time requirements. Designers should therefore evaluate board capacitance, wiring, pull-ups, and connected-device loading rather than treating buffer insertion as a universal cure for bus-loading problems. Typical uses include server and desktop backplanes, plug-in acquisition modules, industrial control cards, communications equipment, and embedded systems where a card connects to an always-powered bus. The buffer is placed between the backplane pins and card-side pins, preserving independent local behavior on each side. System designers should verify idle-bus shutdown sequencing and interpret READY correctly before enabling the card interface. PCB layout should keep SDA and SCL routing compact, preserve the intended pull-up arrangement on each bus side, and provide the decoupling and grounding required by the manufacturer datasheet. Because the verified material does not expose complete electrical timing, current, capacitance, and pin-level limits in the supplied text, those values remain marked for data completion rather than being inferred. This page combines verified manufacturer and distributor information with design guidance, replacement analysis, and practical procurement context. It also distinguishes true pin-compatible alternatives from packaging-only orderable variants, helping engineers make evidence-based interface decisions.

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TCA6408PW

TCA6408PW - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments TCA6408PW is an 8-bit I2C and SMBus I/O expander supporting operation from 1.65 V to 5.5 V at up to 400 kHz, housed in a 16-pin TSSOP package. It provides eight general-purpose bidirectional port pins for remote input and output expansion, plus dedicated interrupt, reset, and configuration-register functions. An I/O expander is a bus-interface IC that extends the number of general-purpose inputs and outputs available to a microcontroller or other embedded controller. In the electronic-component hierarchy, the TCA6408PW is an I2C/SMBus interface controller, a serial interface expander, an interface IC, and ultimately a semiconductor. It reduces the number of host GPIO pins required for switches, indicators, sensors, and other external signals. The device's principal features include eight configurable I/O ports, a two-wire serial interface with a maximum clock frequency of 400 kHz, a broad 1.65 V to 5.5 V operating-voltage range, an interrupt output, a reset input, and configuration registers. These functions allow the host processor to read and control remote digital lines while receiving an interrupt when a relevant input condition occurs. The TCA6408PW uses addressable I2C control registers to configure port direction and input/output data. This register-based architecture keeps peripheral control separate from the host's limited GPIO resources. According to the Texas Instruments manufacturer datasheet, the device is intended for general-purpose remote I/O expansion across many microcontroller families using the I2C interface with SCL and SDA signaling. Typical applications include industrial control panels, battery-powered portable equipment, communications equipment, programmable logic controllers, and compact embedded systems with multiple discrete controls. The 1.65 V minimum operating voltage supports low-voltage portable systems, while the 5.5 V maximum covers conventional 5 V logic environments. The 400 kHz bus rate permits efficient register access when several compatible devices share the bus. Designers should account for the host's I2C address allocation, pull-up requirements on SDA and SCL, and the electrical characteristics of every attached P-port signal. Firmware should configure each port direction before enabling its outputs, and the reset, configuration, and interrupt functions should be considered when defining startup and event-handling behavior. This product page consolidates the verified distributor information, interface details, same-package replacement candidates, and application-oriented design guidance. It also distinguishes documented parameters from values that still require confirmation from the manufacturer datasheet, helping engineers evaluate TCA6408PW procurement and PCB drop-in decisions efficiently.

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TCA6408PWR

TCA6408PWR - 8-Bit I2C I/O Expander | Texas Instruments (Tape & Reel)

The Texas Instruments TCA6408PWR is an 8-bit I2C and SMBus I/O expander supporting operation from 1.65 V to 5.5 V at up to 400 kHz, housed in a 16-pin TSSOP package. It provides eight general-purpose bidirectional port pins for remote input and output expansion, plus dedicated interrupt, reset, and configuration-register functions. An I/O expander is a bus-interface IC that extends the number of general-purpose inputs and outputs available to a microcontroller or other embedded controller. In the electronic-component hierarchy, the TCA6408PWR is an I2C/SMBus interface controller, a serial interface expander, an interface IC, and ultimately a semiconductor. It reduces the number of host GPIO pins required for switches, indicators, sensors, and other external signals. The device's principal features include eight configurable I/O ports, a two-wire serial interface with a maximum clock frequency of 400 kHz, a broad 1.65 V to 5.5 V operating-voltage range, an interrupt output, a reset input, and configuration registers. These functions allow the host processor to read and control remote digital lines while receiving an interrupt when a relevant input condition occurs. The TCA6408PWR uses addressable I2C control registers to configure port direction and input/output data. This register-based architecture keeps peripheral control separate from the host's limited GPIO resources. According to the Texas Instruments manufacturer datasheet, the device is intended for general-purpose remote I/O expansion across many microcontroller families using the I2C interface with SCL and SDA signaling. Typical applications include industrial control panels, battery-powered portable equipment, communications equipment, programmable logic controllers, and compact embedded systems with multiple discrete controls. The 1.65 V minimum operating voltage supports low-voltage portable systems, while the 5.5 V maximum covers conventional 5 V logic environments. The 400 kHz bus rate permits efficient register access when several compatible devices share the bus. Designers should account for the host's I2C address allocation, pull-up requirements on SDA and SCL, and the electrical characteristics of every attached P-port signal. Firmware should configure each port direction before enabling its outputs, and the reset, configuration, and interrupt functions should be considered when defining startup and event-handling behavior. This product page consolidates the verified distributor information, interface details, same-package replacement candidates, and application-oriented design guidance. It also distinguishes documented parameters from values that still require confirmation from the manufacturer datasheet, helping engineers evaluate TCA6408PWR procurement and PCB drop-in decisions efficiently.

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TCA6416ARTWR

TCA6416ARTWR - 16-Bit I2C I/O Expander with Voltage Translation | TI

The Texas Instruments TCA6416ARTWR is a 16-bit translating I2C/SMBus I/O expander with 1.65V to 5.5V operation, 400 kHz Fast Mode I2C support, voltage translation between host and port banks, and an open-drain interrupt output, housed in a 24-pin WQFN (RTW) 4x4 mm package with exposed thermal pad. An I/O expander is a category of bus-interface IC that uses a serial protocol (typically I2C or SPI) to add parallel general-purpose input/output pins to a host microcontroller whose native GPIO count is insufficient. Architecturally the TCA6416ARTWR sits beneath the "I2C peripheral" hierarchy: it is a slave I2C device that decodes SCL/SDA traffic, drives 16 quasi-bidirectional I/O ports, and exposes a polarity-inversion register, configuration register, input/output register, and a maskable interrupt. Voltage translation allows a 1.8V host MCU to switch 5V external loads without level-shifters, which is essential when interfacing legacy industrial or LED-driver peripherals. Key features include 16 individually configurable I/O bits, hardware-address pins (A0/A1/A2) for up to 8 devices on one bus (128 total ports), an active-low RESET input, an open-drain INT output that signals input-state changes, and 5V tolerant I/O ports with 25 mA sink capability per pin. The WQFN-24 (RTW) 4x4 mm package offers a low 0.8 mm height, suitable for space-constrained handheld and embedded designs. The TCA6416ARTWR implements a write-then-read protocol where the host writes a command byte to select the target register (Input, Output, Polarity Inversion, or Configuration), then reads or writes the corresponding data byte. The interrupt is cleared by reading the input port register, giving firmware a clean edge-triggered event model. Internal pull-up current sources on each port line enable direct connection to switches or buttons without external resistors. Typical applications include expanding GPIO on portable consumer electronics, industrial control panels, IoT sensor hubs, white-goods HMI boards, and any design where a low-pin-count MCU (e.g., a 32-pin Cortex-M0) needs additional buttons, LEDs, or relay drivers. It is frequently paired with low-pin-count MCUs to keep BOM cost down. When designing with this device, place 0.1 uF decoupling capacitors close to VCCI and VCCP supply pins, keep the I2C SCL/SDA traces short, and ensure pull-up resistors (typically 4.7 kohm at 400 kHz) are sized against bus capacitance. The RESET pin should be tied to VCCI through a 10 kohm resistor unless driven by the host. This page synthesizes verified distributor stock, drop-in pin-compatible alternatives, and practical design notes not consolidated in the manufacturer datasheet, helping engineers shorten component selection time and avoid sourcing risk for production builds.

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TCA6416PW

TCA6416PW - 16-Bit I2C I/O Expander | Texas Instruments

Texas Instruments TCA6416PW is a 16-bit I2C/SMBus I/O expander with a 1.65 V to 5.5 V operating supply range, 400 kHz bus support, interrupt output, reset control, and configuration registers in a 24-pin TSSOP package. It adds 16 general-purpose I/O ports to a host microcontroller through a two-wire serial interface, reducing the number of GPIO pins required in compact embedded systems. An I2C I/O expander is a type of interface IC and serial port expander that sits between a host processor and external digital lines. Its position in the hierarchy is I2C I/O expander > serial I/O expander > interface IC > semiconductor. The device is useful when a design needs more input, output, or bidirectional GPIO resources than the host controller can provide directly. Key features include 16 configurable I/O ports, bidirectional voltage-level translation through the 1.65 V to 5.5 V operating range, an interrupt output for change notification, a reset input, and configuration registers. The verified product information identifies the TCA6416 as an I/O expander for general-purpose remote I/O expansion across common microcontroller families using SCL and SDA. The TCA6416PW ordering option is supplied in a 24-pin TSSOP package. The device communicates through the I2C/SMBus-compatible two-wire interface at up to 400 kHz according to DigiKey's product listing. Configuration registers allow the host software to identify inputs, outputs, and polarity behavior, while the interrupt output provides a way for the host to react to a change on a monitored port. The reset and configuration features support deterministic initialization and power-management sequencing. Typical uses include industrial control panels, sensor and actuator interfaces, communication equipment, instrumentation, and embedded systems that need additional GPIO lines. It is particularly useful when board area, connector count, or host-controller pin availability is constrained, because sixteen external digital lines are added without dedicating sixteen parallel microcontroller pins. Designers should confirm the I2C pull-up requirements, address configuration, voltage levels, and reset timing in the manufacturer datasheet. The TSSOP footprint requires careful PCB layout and adequate clearance for the 24-pin package. Firmware should also define input, output, and polarity behavior before enabling interrupt-driven event handling. The manufacturer product page and verified distributor listings provide the primary source for electrical and ordering details.

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TCA6416PWR

TCA6416PWR - 16-Bit I2C I/O Expander | Texas Instruments (Tape & Reel)

Texas Instruments TCA6416PWR is a 16-bit I2C/SMBus I/O expander with a 1.65 V to 5.5 V operating supply range, 400 kHz bus support, interrupt output, reset control, and configuration registers in a 24-pin TSSOP package. It adds 16 general-purpose I/O ports to a host microcontroller through a two-wire serial interface, reducing the number of GPIO pins required in compact embedded systems. An I2C I/O expander is a type of interface IC and serial port expander that sits between a host processor and external digital lines. Its position in the hierarchy is I2C I/O expander > serial I/O expander > interface IC > semiconductor. The device is useful when a design needs more input, output, or bidirectional GPIO resources than the host controller can provide directly. Key features include 16 configurable I/O ports, bidirectional voltage-level translation through the 1.65 V to 5.5 V operating range, an interrupt output for change notification, a reset input, and configuration registers. The verified product information identifies the TCA6416 as an I/O expander for general-purpose remote I/O expansion across common microcontroller families using SCL and SDA. The TCA6416PWR ordering option is supplied in a 24-pin TSSOP package. The device communicates through the I2C/SMBus-compatible two-wire interface at up to 400 kHz according to DigiKey's product listing. Configuration registers allow the host software to identify inputs, outputs, and polarity behavior, while the interrupt output provides a way for the host to react to a change on a monitored port. The reset and configuration features support deterministic initialization and power-management sequencing. Typical uses include industrial control panels, sensor and actuator interfaces, communication equipment, instrumentation, and embedded systems that need additional GPIO lines. It is particularly useful when board area, connector count, or host-controller pin availability is constrained, because sixteen external digital lines are added without dedicating sixteen parallel microcontroller pins. Designers should confirm the I2C pull-up requirements, address configuration, voltage levels, and reset timing in the manufacturer datasheet. The TSSOP footprint requires careful PCB layout and adequate clearance for the 24-pin package. Firmware should also define input, output, and polarity behavior before enabling interrupt-driven event handling. The manufacturer product page and verified distributor listings provide the primary source for electrical and ordering details.

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TCA6416PWT

TCA6416PWT - 16-Bit I2C I/O Expander | Texas Instruments

Texas Instruments TCA6416PWT is a 16-bit translating I2C/SMBus I/O expander with a 1.65 V to 5.5 V operating supply range, interrupt output, reset input, and configuration registers in a 24-pin TSSOP package. It expands a serial I2C or SMBus connection into 16 general-purpose input/output ports, reducing the number of host-controller pins required by boards containing buttons, LEDs, logic signals, or control lines. An I/O expander is an interface IC that sits between a host processor and peripheral GPIO devices. The I2C or SMBus interface carries commands and register data over a compact serial bus, while the parallel port pins provide individually controlled digital connections. In the product hierarchy, the TCA6416PWT is an I/O expander, a serial-interface peripheral controller, and ultimately an integrated circuit used to extend digital input/output capacity. The device supports operation from 1.65 V to 5.5 V and provides voltage-level translation between the host bus and external GPIO circuitry. According to the Texas Instruments product page, it includes interrupt, reset, and configuration registers. The open-drain interrupt output indicates that an input state differs from the corresponding Input Port register state, allowing the host to avoid continuous polling. The RESET pin initiates the same reset and initialization sequence as power-on reset. Communication with the TCA6416PWT is supported at I2C/SMBus rates up to 400 kHz. The translated serial interface lets a host operating at one logic level communicate with attached circuitry operating at another voltage level within the device's specified operating range. This is particularly useful in compact industrial, communications, consumer, and embedded-control products where the controller has too few direct GPIO pins. TCA6416PWT applications include remote push-button panels, LED status indicators, relay-control interfaces, sensor digital outputs, and general board-level GPIO expansion. Designers can configure ports as inputs or outputs through the device registers, read input states, and receive an interrupt when a monitored input changes. The 24-pin TSSOP package is suitable for conventional surface-mount PCB assembly and offers a practical pin count for a 16-port device with serial control and interrupt support. When laying out the circuit, place the device close to the connector or controlled circuitry reached by the 16 port lines, while keeping the I2C bus routing short and away from high-current switching paths. Confirm pull-up resistor requirements, address configuration, logic thresholds, and the open-drain interrupt connection in the manufacturer datasheet. This page combines the device specifications, sourcing guidance, drop-in alternatives, comparison data, and application-focused engineering guidance for faster component evaluation and PCB planning.

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TCA6424ARGJR

TCA6424ARGJR - 24-bit I2C/SMBus I/O Expander | Texas Instruments

The Texas Instruments TCA6424ARGJR is a 24-bit I2C/SMBus I/O expander housed in a 32-pin UQFN (RGJ) 5x5 mm package with an exposed thermal pad. The device operates from a 1.65 V to 5.5 V supply on the I2C/SMBus side (VCCI) and supports 1.8 V, 2.5 V, 3.3 V and 5 V tolerant I/O banks on the P-port side (VCCP). It communicates through the standard I2C interface up to 400 kHz and provides 24 general-purpose bidirectional I/O lines organized as three 8-bit ports (P0, P1, P2). An I/O expander is a category of interface IC that adds extra general-purpose digital input/output lines to a microcontroller or processor that has run out of native GPIOs. In the broader taxonomy, the TCA6424ARGJR sits at: I/O expander -> peripheral expander -> interface IC -> integrated circuit. The device addresses a fundamental I/O shortage problem in compact, GPIO-constrained designs such as mobile phones, wearables, and low-cost MCUs without resorting to a more expensive processor. Key features include an open-drain interrupt output (INT) that asserts whenever any input state differs from the corresponding Input Port register, a hardware RESET pin that re-initializes all registers without removing power, and configurable register banks that allow simultaneous access without locking. The device supports standard (100 kHz) and fast (400 kHz) I2C modes and provides three hardware address pins (A0, A1, A2), allowing up to eight devices on the same I2C bus for a total of 192 I/O lines. Typical applications include adding keypad scanning, LED indicators, push-button monitoring, and GPIO expansion in cell phones, media players, industrial HMI panels, gaming consoles, and infotainment systems. The wide voltage tolerance (1.65 V to 5.5 V) makes it particularly useful when bridging a 1.8 V SoC to legacy 5 V peripherals. When designing with this part, ensure the VCCI supply is present whenever the device is communicating; the P-port voltage (VCCP) may be lower than VCCI. Place 0.1 uF decoupling capacitors close to both VCCI and VCCP pins. If multiple TCA6424A devices share the bus, assign unique A0/A1/A2 addresses and pull the INT outputs together or read each individually to avoid contention. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone. The UQFN-32 (RGJ) package footprint, configurable register banks, and RESET pin distinguish the TCA6424ARGJR from lower-cost expanders such as the TCA6408A or PCF8575.

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TCA9406DCTR

TCA9406DCTR - 2-Bit Bidirectional I2C/SMBus Level Translator | TI

The Texas Instruments TCA9406DCTR is a 2-bit bidirectional I2C bus and SMBus voltage-level translator with an output enable (OE) input, operational from 1.65 V to 3.6 V on the A-side (VCCA) and 2.3 V to 5.5 V on the B-side (VCCB), housed in an 8-pin SM8/SSOP surface-mount package with 8 kV HBM ESD protection. A voltage-level translator is an interface IC that bridges digital signal domains operating at different supply rails, allowing a microcontroller running at 1.8 V or 3.3 V to safely communicate with peripheral devices on a 5 V bus. Within the signal-chain hierarchy, level translators sit between logic ICs and physical bus lines and are essential members of the I2C/SMBus interface family, where open-drain bidirectional lines cannot be shifted with simple resistor dividers. Key differentiating specifications include true bidirectional operation without a direction pin, support for the 1-MHz Fast-mode Plus I2C class of operation with data rates up to 24 Mbps in general-purpose push-pull use, and 8 kV human-body-model ESD robustness on the bus pins. The dedicated OE input lets the system place both channels in the high-impedance state during power sequencing or bus reconfiguration, preventing bus contention and back-powering through partial-rail conditions. Architecturally, the TCA9406 integrates an internal boost/reference generator on the B side so that only two supply pins (VCCA and VCCB) and a minimal external component count are required - no external pull-up resistors to a reference rail are needed, unlike pass-gate translators such as the TI PCA9306. This integrated drive makes rise and fall times far less dependent on bus loading, which matters when the bus runs at 400 kHz or 1 MHz with cable or connector capacitance. Typical applications include I2C sensor interfacing in battery-powered products, SMBus communication between 3.3 V management controllers and 5 V power-supply modules, and level shifting between low-voltage MCUs and 5 V EEPROMs or RTCs. It fits anywhere a 1.8 V, 2.5 V, or 3.3 V host must drive a 5 V peripheral bus reliably. A key design consideration: the OE pin should be driven by a supply-rail supervisor or held low until both VCCA and VCCB are stable, since enabling the translator before the higher rail is up can momentarily clamp the bus. This page synthesizes distributor pricing and stock, drop-in alternative analysis against the NXP PCA9306, pinout data, and practical design notes not found in the manufacturer datasheet.

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TCA9517DGKR

TCA9517DGKR - I2C Bus Repeater Level Translator | TI

The Texas Instruments TCA9517DGKR is a 2-channel, bidirectional level-translating I2C bus repeater and buffer supporting 400 kHz (Fast-mode) I2C and SMBus operation, with A-side supply from 0.9 V to 5.5 V and B-side supply from 2.7 V to 5.5 V, housed in an 8-pin VSSOP (DGK) package. A level-translating I2C bus buffer is an interface IC that sits between two segments of an I2C or SMBus, electrically isolating the bus capacitance and logic levels on each side. In the interface IC hierarchy, it belongs to the signal buffer/repeater family of level translators, which sit above simple transistors and below full protocol bridges. By segmenting the bus, the repeater allows longer buses and more devices than the I2C standard capacitance limit would otherwise permit. Key features include support for both standard-mode (100 kHz) and fast-mode (400 kHz) I2C signaling, an enable (EN) pin for bus isolation and power sequencing, and powered-off high-impedance I2C pins that effectively remove the device from the bus when either supply is absent. The TCA9517 also incorporates an acceleration feature that speeds up the rising edge of SDA and SCL on the B side. Architecturally, the TCA9517 uses two distinct driver types. The A-side drivers operate from 0.9 V to 5.5 V and drive more current without requiring the buffered-low static offset voltage, so a low on the B side translates to a nearly 0 V hard low on the A side. This accommodates the smaller voltage swings of lower-voltage logic such as 1.2 V or 1.8 V I2C peripherals. The B side retains the static voltage offset needed for hot-swapping and rise-time acceleration. Typical applications include I2C bus expansion in industrial automation, server and telecom backplane management (SMBus), and level translation between 1.8 V microcontrollers and 3.3 V sensors or EEPROMs. Design consideration: the A-side output can sink more current than a plain MOSFET translator, so pay attention to total bus capacitance per segment; keep pull-up resistor values sized per segment rather than one pair for the whole bus. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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TCA9517DGKRQ1

TCA9517DGKRQ1 - Automotive I2C Level-Shifting Buffer | TI

The Texas Instruments TCA9517DGKRQ1 is an automotive-grade, 2-bit level-translating I2C/SMBus buffer/repeater operating at up to 400 kHz, housed in an 8-pin VSSOP (DGK) package and qualified to AEC-Q100 for -40C to +125C operation. An I2C bus buffer, also called a level translator or bus repeater, is an interface IC that sits between two segments of an I2C or SMBus serial bus. Its role in the interface IC hierarchy is to isolate bus capacitance, allowing longer or more heavily loaded buses, and to translate logic voltage levels between devices powered from different supply rails, such as a 1.8V microcontroller talking to 5V peripherals. Key features include bidirectional voltage-level translation between low voltages down to 0.9 V on side A and 2.7 V to 5.25 V on side B, support for both standard-mode (100 kHz) and fast-mode (400 kHz) I2C plus SMBus, and a powered-off high-impedance state that isolates both bus segments when either supply rail is absent. The enable (EN) pin provides additional bus control, and open-drain I/O structures preserve the wired-AND nature of I2C. Technically, the TCA9517-Q1 drives both sides of the bus, refreshing rise times and removing the cumulative load of stubs and cables. Unlike passive FET level shifters, it does not trade drive strength for level translation, so clock stretching and multi-master arbitration are preserved. It supports up-translation, down-translation, and same-level buffering. Typical applications include automotive body electronics and infotainment I2C bus extension, PMBus/SMBus power-supply management in industrial systems, and level translation between 1.8V or 3.3V MCUs and 5V sensors or EEPROMs. Design consideration: because the device drives each side actively, do not connect the A and B sides to the same bus segment, and keep EN tied low until both supply rails are stable to avoid bus latch-up during power sequencing. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet alone. Pricing shown as of 2026-10-19.

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TCA9517DR

TCA9517DR - Level-Shifting I2C Bus Repeater | Texas Instruments

The Texas Instruments TCA9517DR is a 2-bit level-translating I2C/SMBus bus buffer supporting 400 kHz Fast Mode operation, with an A-side supply range of 0.9 V to 5.5 V and a B-side supply range of 3.0 V to 5.5 V, housed in an 8-pin SOIC (D) package. An I2C bus buffer (also called a bus repeater or level translator) is an interface IC that sits between two segments of an I2C or SMBus serial bus. Its role in the interface IC hierarchy is to electrically isolate the two segments while translating signal levels between devices powered at different voltages, allowing low-voltage microcontrollers to communicate safely with higher-voltage peripherals. A buffer also isolates bus capacitance, so each side can drive longer traces or more devices than a single unbuffered bus would allow. Key features include fully bidirectional level translation with no direction-control pin, a low-level input on the A-side set at 0.3 x VCCA that accommodates smaller voltage swings of lower-voltage logic, and a powered-off high-impedance state on all pins so the part never loads the bus when unpowered. According to the TCA9517 datasheet, the A-side drivers operate from 0.9 V to 5.5 V, drive more current than B-side drivers, and do not require a buffered low or static offset voltage, producing a nearly 0 V hard low on the A-side. Architecturally, the TCA9517 uses open-drain drivers with rise-time support rather than a static 0.5 V low offset on the A-side, distinguishing it from the older PCA9517 generation. The 230 ns maximum propagation delay preserves I2C Fast Mode timing margins at 400 kHz, and the two channels translate both SDA and SCA lines simultaneously. Typical applications include connecting 1.8 V or 3.3 V MCU I2C ports to 5 V EEPROMs, sensors, and RTCs in industrial and telecom equipment, isolating bus capacitance in long backplane runs, and buffering densely loaded SMBus segments. Design consideration: keep the A-side connected to the lower-voltage, higher-capacitance segment; the B-side static 0.5 V offset requires pairing buffers B-side to A-side in cascaded topologies. This page synthesizes distributor pricing, verified drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.

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