Texas Instruments TXB0104D

Overview

TXB0104D from Texas Instruments is a 4-bit bidirectional voltage-level translator with automatic direction sensing, supporting 1.2V–3.6V on the A port and 1.65V–5.5V on the B port (VCCA ≤ VCCB), ±15kV HBM ESD protection on B port, 5μA max ICC, and OE input referenced to VCCA. It enables low-power interconnection between mixed-voltage domains in portable consumer interfaces.

For engineers reviewing the TXB0104D datasheet, TXB0104D pinout, TXB0104D application, or TXB0104D equivalent, this device is selected for its automatic bidirectional translation, I_OFF-enabled partial power-down capability, high-impedance state control via OE, robust ESD tolerance, and SOIC-14 package compatibility with legacy PCB layouts.

Technical Context

The TXB0104D implements dual-rail architecture with independent A-port (VCCA) and B-port (VCCB) supplies, enabling seamless translation across 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V logic nodes without external direction control. Its auto-sensing circuitry detects signal flow direction dynamically per channel.

VCC isolation ensures all outputs enter high-impedance when either supply is at GND; OE is VCCA-referenced and must be pulled low via pulldown resistor during power sequencing. I_OFF functionality prevents backflow current during partial power-down, meeting JESD78 Class II latch-up requirements (>100mA).

Key Specifications

Pinout & Package

TXB0104D uses a 14-pin SOIC package (8.65mm × 3.91mm) with standard JEDEC MS-012AC footprint, compatible with automated assembly and thermal relief pad design rules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC4T245PW and TXB0304RGYR, the TXB0104D uniquely combines SOIC-14 manufacturability, ±15kV B-port ESD, and true automatic direction sensing-making it optimal for cost-sensitive, high-reliability portable interfaces where board space and ESD robustness are critical.

Availability

TXB0104D is available at Aetrix Electronics and suitable for smartphone headset interfaces, tablet USB-C CC line translation, laptop embedded controller buses, industrial HMI display backlight control, and other applications requiring stable component supply with guaranteed long-term sourcing.

Supply support for TXB0104D 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 50 years of innovation in precision analog and low-power interface solutions.

The TXB0104D belongs to TI's TXB bidirectional translator product line, designed specifically for automatic, low-power, mixed-voltage interconnect in portable and battery-operated electronics where manual direction control is impractical.

FAQ

What voltage ranges does the TXB0104D support on its A and B ports?

The TXB0104D supports 1.2V to 3.6V on the A port (VCCA) and 1.65V to 5.5V on the B port (VCCB), with the strict requirement that VCCA must not exceed VCCB. This enables translation between common logic families including 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V domains without external level-shifting components. The TXB0104D maintains full functionality across this entire operating range.

How does the TXB0104D handle power sequencing when VCCA and VCCB are powered independently?

The TXB0104D features VCC isolation: if either VCCA or VCCB is driven to GND, all outputs automatically enter a high-impedance state. This prevents back-current flow and bus contention during asymmetric power-up/down sequences. For reliable operation, OE must be tied to GND via a pulldown resistor during power transitions. The TXB0104D's I_OFF circuitry further blocks damaging current in partial power-down states.

What is the maximum data rate supported by the TXB0104D, and under what conditions?

The TXB0104D supports up to 100 Mbps maximum data rate when VCCA = 2.5V or 3.3V and VCCB = 2.5V, 3.3V, or 5V. At lower VCCA (e.g., 1.2V), the maximum rate drops to 20 Mbps. These values are measured using SOIC-14 package variants and reflect guaranteed timing performance across –40°C to 85°C. The TXB0104D achieves this with propagation delays as low as 0.8 ns (A-to-B) and channel-to-channel skew under 0.5 ns.

Does the TXB0104D require external passive components for basic operation?

The TXB0104D requires only a pulldown resistor on the OE pin (typically ≤10 kΩ to GND) to ensure high-impedance state during power-up/power-down. No external direction-control logic, pull-up/down resistors on data lines, or bypass capacitors beyond standard 0.1 μF VCCA/VCCB decoupling are required. Its automatic direction sensing and integrated ESD protection eliminate the need for external TVS diodes on the B port. The TXB0104D is designed for minimal external component count.

How does the TXB0104D's ESD protection compare between A and B ports?

The TXB0104D provides asymmetric ESD protection: the B port is rated for ±15kV HBM (Human-Body Model), while the A port is rated for ±2.5kV HBM. This reflects its intended use case-B port connects to exposed, user-accessible interfaces (e.g., USB-C, headset jacks), whereas the A port interfaces internally with protected SoC or PMIC pins. Both ports support 1.5kV CDM. The TXB0104D's B-port rating meets IEC 61000-4-2 Level 4 for handheld devices.