Texas Instruments TXB0104DR

Overview

TXB0104DR from Texas Instruments is a 4-bit bidirectional voltage-level translator with automatic direction sensing, supporting 1.2V–3.6V on A port and 1.65V–5.5V on B port (VCCA ≤ VCCB), ±15kV HBM ESD protection on B port, 5μA max ICC, and I_OFF partial power-down capability. It enables low-voltage interconnect between processors and peripherals in space-constrained mobile devices.

For engineers reviewing the TXB0104DR datasheet, TXB0104DR pinout, TXB0104DR application, or TXB0104DR equivalent, this page delivers verified electrical specs, package-specific pin functions, real-world use cases in smartphones and headsets, and two validated alternative parts for supply continuity and design flexibility.

Technical Context

The TXB0104DR implements auto-direction-sensing logic that dynamically routes signal flow without external control lines, using internal weak pull-ups and threshold detection to determine data direction per channel. Its dual-rail architecture isolates VCCA and VCCB domains, enabling translation across 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V nodes while enforcing VCCA ≤ VCCB.

VCC isolation ensures all outputs enter high-impedance state if either supply rail drops to GND; OE input is referenced to VCCA and must be pulled low via external resistor during power sequencing. I_OFF circuitry blocks current backflow when powered down, satisfying JESD78 Class II latch-up requirements (>100mA).

Key Specifications

Pinout & Package

TXB0104DR uses SOIC-14 (D) package: 8.65mm × 3.91mm body, 1.27mm pitch, plastic body with gull-wing leads. Thermal performance: R_θJA = 90.7°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC4T245RGE and PCA9306DCUR, TXB0104DR uniquely combines auto-direction sensing, 5V-tolerant B-port I/O, ±15kV ESD robustness, and I_OFF power-down-making it optimal for compact, high-reliability mobile interfaces where GPIO count and ESD immunity are critical.

Availability

TXB0104DR is available at Aetrix Electronics and suitable for smartphone baseband interfaces, tablet sensor hubs, desktop USB-C docking stations, and headset audio controller bridges requiring stable component supply across automotive-qualified and industrial-grade production cycles.

Supply support for TXB0104DR 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 decades of expertise in precision signal chain and power management ICs.

The TXB0104DR belongs to TI's voltage-level translation product line, engineered specifically for low-power, high-density mobile and portable electronics requiring seamless interoperability between mixed-voltage digital subsystems.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of TXB0104DR?

VCCA must not exceed VCCB under any operating condition, as specified in the absolute maximum ratings and recommended operating conditions. The device supports VCCA = 1.2V–3.6V and VCCB = 1.65V–5.5V, but VCCA ≤ VCCB is strictly enforced to prevent internal node overstress and ensure correct direction-sensing behavior. Violating this constraint may cause undefined output states or accelerated wear-out.

Does TXB0104DR require external pull-up resistors on A-port or B-port lines?

No, TXB0104DR does not require external pull-up resistors for basic bidirectional operation-the internal auto-direction sensing relies on weak internal biasing, not external termination. However, pull-ups may still be needed for specific bus protocols (e.g., I²C) or to meet rise-time requirements dictated by trace capacitance and data rate; those are system-level design choices, not device requirements.

Can TXB0104DR safely interface a 5V microcontroller GPIO with a 1.2V FPGA bank?

Yes, TXB0104DR supports VCCB = 5V and VCCA = 1.2V (within its 1.2V–3.6V range), enabling safe 5V→1.2V and 1.2V→5V translation. The B-port tolerates 5V inputs and outputs, while A-port logic thresholds scale with VCCA. Ensure OE is properly controlled and VCCA ≤ VCCB is maintained; no level-shifting diodes or series resistors are needed.

How does the OE pin behave during power-up, and what is the recommended external circuit?

The OE pin is referenced to VCCA and must be held low during power-up to guarantee all I/Os remain in high-impedance state until both supplies stabilize. TI recommends tying OE to GND through a pulldown resistor; the minimum value depends on the driver's sourcing capability-typically 10kΩ suffices for most applications. Leaving OE floating risks unintended output activation and bus contention.

Is TXB0104DR compatible with I²C open-drain signaling, and how does it handle clock stretching?

TXB0104DR supports I²C signaling-including clock stretching-because its auto-direction sensing works with passive pull-up buses. When the master releases SCL, the slave can hold it low; TXB0104DR detects the direction reversal and forwards the stretched signal without added latency or protocol violation. No configuration or external components are required beyond standard I²C pull-ups.