Texas Instruments TXS0102DCUTG4

Overview

TXS0102DCUTG4 from Texas Instruments is a 2-bit bidirectional voltage-level translator with auto-direction sensing, supporting 1.65V–3.6V on A-port and 2.3V–5.5V on B-port, up to 24Mbps (push-pull) or 2Mbps (open-drain), used in I²C/SMBus, UART, and GPIO interfacing between mixed-voltage microcontrollers and peripherals.

For engineers reviewing the TXS0102DCUTG4 datasheet, TXS0102DCUTG4 pinout, TXS0102DCUTG4 application, or TXS0102DCUTG4 equivalent, this page delivers verified electrical specs, package-confirmed pin functions, thermal metrics for VSSOP-8 (DCU), real-world interface constraints, and validated alternative options for level-shifting design validation.

Technical Context

The TXS0102DCUTG4 implements a pass-gate architecture with integrated edge-rate accelerator one-shot circuits per channel, enabling automatic bidirectional translation without direction-control signals. It uses dual independent supply rails (VCCA ≤ VCCB) and internal 10kΩ pull-ups on both ports - eliminating external resistors in open-drain configurations.

VCC isolation ensures high-impedance state when either VCCA or VCCB is at GND; no power-supply sequencing is required. I_off support enables partial power-down operation, and latch-up immunity exceeds 100mA per JESD78 Class II.

Key Specifications

Pinout & Package

TXS0102DCUTG4 is packaged in an 8-pin VSSOP (DCU) measuring 2.0mm × 3.1mm, optimized for space-constrained PCB layouts and thermal performance (R_θJA = 229.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0102DCUTG4, TXB0102DCUR offers higher drive strength but requires external pull-ups for open-drain use, while PCA9306DCUR provides dedicated I²C optimization at the expense of flexibility and isolation - making TXS0102DCUTG4 the balanced choice for mixed-signal, multi-protocol, and hot-swap-capable systems.

Availability

TXS0102DCUTG4 is available at Aetrix Electronics and suitable for I²C bus bridging, UART voltage translation, GPIO expansion interfaces, and hot-swappable peripheral adapters requiring stable component supply across industrial, automotive, and embedded computing programs.

Supply support for TXS0102DCUTG4 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 delivering analog, embedded processing, and connectivity technologies with emphasis on reliability, precision, and energy efficiency.

The TXS0102DCUTG4 belongs to TI's Switch-type voltage translator family, engineered specifically for seamless bidirectional logic-level compatibility across heterogeneous voltage domains in resource-constrained embedded systems.

FAQ

What is the maximum supported data rate for TXS0102DCUTG4 in push-pull mode?

The TXS0102DCUTG4 supports up to 24Mbps in push-pull mode when VCCA = 1.8V ±0.15V and VCCB = 5V ±0.5V, as confirmed in Section 5.9 of the official datasheet. This performance is enabled by its edge-rate accelerator circuitry, which reduces output rise/fall times under capacitive load conditions. Real-world throughput depends on trace capacitance and driver impedance - keep external loading below 15pF for guaranteed 24Mbps operation.

Does TXS0102DCUTG4 require external pull-up resistors for I²C operation?

No, TXS0102DCUTG4 does not require external pull-up resistors for I²C operation because it integrates 10kΩ pull-ups on both A-port (to VCCA) and B-port (to VCCB). These internal resistors satisfy standard-mode (100kHz) and fast-mode (400kHz) I²C bus requirements when used with typical trace capacitance (<400pF). External resistors may be added in parallel only if faster rise times or stronger drive are needed.

Can TXS0102DCUTG4 operate with VCCA = 3.3V and VCCB = 2.5V?

No, TXS0102DCUTG4 cannot operate with VCCA = 3.3V and VCCB = 2.5V because the datasheet explicitly requires VCCA ≤ VCCB (Section 4, Table 4-1 and Section 5.3). With VCCB = 2.5V, the minimum valid VCCA is 1.65V and maximum is 2.5V. Attempting VCCA = 3.3V violates absolute maximum ratings and risks malfunction or damage due to improper gate-biasing of the internal pass transistors.

What is the function of the OE pin on TXS0102DCUTG4, and how should it be handled during power-up?

The OE (output enable) pin on TXS0102DCUTG4 is an active-high control that places all I/Os in high-impedance state when low. To ensure safe power-up behavior, OE must be held low (e.g., via pulldown resistor to GND) until both VCCA and VCCB are stable - preventing undefined states or bus contention. The device specifies 200ns enable time (ten), so OE can be released after supplies settle, typically within microseconds.

How does TXS0102DCUTG4 achieve bidirectional translation without a direction-control signal?

TXS0102DCUTG4 achieves directionless translation using a pass-gate architecture with auto-sensing bias circuitry. Each channel monitors relative voltage levels on A and B ports to dynamically configure the N-channel transistor as source or drain - enabling instantaneous reversal of signal flow. This eliminates need for external direction logic and supports true bidirectional protocols like I²C, where master and slave roles switch mid-transaction.