Texas Instruments TXS0102DCUT

Overview

TXS0102DCUT from Texas Instruments is a 2-bit bidirectional voltage-level translator IC designed for mixed-voltage digital interfacing between 1.65V–3.6V (A port) and 2.3V–5.5V (B port) logic domains. It supports up to 24Mbps push-pull and 2Mbps open-drain data rates, features integrated 10kΩ pull-up resistors on both ports, and operates without direction-control signaling. It enables I²C/SMBus level translation in compact portable electronics.

For engineers reviewing the TXS0102DCUT datasheet, TXS0102DCUT pinout, TXS0102DCUT application, or TXS0102DCUT equivalent, key selection considerations include VCCA ≤ VCCB compliance, OE-controlled high-impedance state, auto-direction sensing architecture, and thermal performance in DCT (SSOP-8) package under industrial temperature range (–40°C to +85°C).

Technical Context

The TXS0102DCUT employs a pass-gate transistor topology with edge-rate accelerator (one-shot) circuitry per channel to detect and speed up rising edges-reducing output impedance to ~50–70Ω during transition. Its gate bias is set ~1 VT above the low-voltage rail, enabling automatic bidirectional signal flow without external direction control.

Each A-port I/O includes an internal 10kΩ pull-up to VCCA; each B-port I/O has a matching 10kΩ pull-up to VCCB. The OE input references VCCA and places all I/Os in high-impedance when low. VCC isolation ensures both ports enter Hi-Z if either VCCA or VCCB is at GND.

Key Specifications

Pinout & Package

TXS0102DCUT is packaged in an 8-pin SSOP (DCT) measuring 2.95mm × 4mm, optimized for space-constrained PCB layouts while maintaining hand-solderability and thermal dissipation (R_θJA = 168.5°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional voltage translation applications.

Compared with TXS0102DCUT, TXS0104DQGR offers higher channel density but sacrifices OE control, while PCA9306DCUR reduces functionality and performance to meet basic open-drain translation needs at lower cost-making TXS0102DCUT optimal for mixed-mode, OE-managed, space-aware designs.

Availability

TXS0102DCUT is available at Aetrix Electronics and suitable for I²C bus translation, UART level shifting, and GPIO expansion applications requiring stable component supply, industrial temperature support, and SSOP-8 footprint compatibility.

Supply support for TXS0102DCUT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in power management and signal chain solutions.

The TXS0102DCUT belongs to TI's Switch-type voltage translator family, engineered for seamless interoperability across heterogeneous voltage domains in portable, industrial, and automotive subsystems-prioritizing auto-direction sensing, low power, and integration.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the TXS0102DCUT?

The TXS0102DCUT requires VCCA ≤ VCCB at all times, with VCCA limited to 1.65V–3.6V and VCCB to 2.3V–5.5V. The absolute maximum differential is defined by these ranges: for example, VCCA = 3.6V and VCCB = 2.3V violates the VCCA ≤ VCCB rule and will cause malfunction. Valid combinations include VCCA = 1.8V / VCCB = 3.3V or VCCA = 3.3V / VCCB = 5.0V. Always verify VCCA ≤ VCCB in your schematic before finalizing the TXS0102DCUT design.

Can the TXS0102DCUT translate signals between 5V and 1.8V logic levels in both directions simultaneously?

Yes-the TXS0102DCUT supports true bidirectional translation between 1.8V (A port) and 5V (B port) domains without direction control. When VCCA = 1.8V and VCCB = 5.0V, A-port inputs see 5V signals clamped safely by internal protection, and B-port outputs drive to ~3.3V (VCCB × 0.67) with VOL < 0.4V. This enables simultaneous SDA/SCL handshaking in I²C systems. The TXS0102DCUT achieves this using its pass-gate + one-shot architecture, not level-shifting buffers.

Does the TXS0102DCUT require external pull-up resistors for I²C operation?

No-each A-port I/O has an integrated 10kΩ pull-up to VCCA, and each B-port I/O has a 10kΩ pull-up to VCCB. These eliminate the need for external resistors in standard I²C implementations. However, if faster rise times are required (e.g., for 1MHz Fast-mode Plus), external lower-value pull-ups may be added in parallel-but doing so affects VOL and must be validated per the TXS0102DCUT's electrical characteristics table.

How does the OE pin behave during power-up, and what is the recommended tie-off strategy for the TXS0102DCUT?

The OE pin is active-high and referenced to VCCA. To ensure the TXS0102DCUT starts in high-impedance state during power-up, tie OE to GND via a pulldown resistor (e.g., 10kΩ). This prevents bus contention while VCCA ramps. Once VCCA is stable, OE can be driven high by the host MCU. The TXS0102DCUT's enable time (ten) is 200ns, so software must wait ≥200ns after OE assertion before initiating data transfer.

Is the TXS0102DCUT compatible with 1.5V logic systems on the A port?

No-the TXS0102DCUT specifies a minimum VCCA of 1.65V per datasheet Section 5.3. Operating at 1.5V violates recommended conditions and risks unreliable pass-gate turn-on, increased VOL, and failure to meet timing specs. For 1.5V interfaces, consider TI's TXS0108E (supports 1.2V–3.6V A port) or consult the latest revision of the TXS0102DCUT datasheet (SCES640L, Jan 2026) for any updated guidance-though no 1.5V support is documented for TXS0102DCUT.