Texas Instruments TXB0104DRG4

Overview

TXB0104DRG4 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 seamless logic-level bridging between low-voltage processors (e.g., 1.8V ARM cores) and higher-voltage peripherals (e.g., 3.3V or 5V sensors or displays) in space-constrained mobile interfaces.

For engineers reviewing the TXB0104DRG4 datasheet, TXB0104DRG4 pinout, TXB0104DRG4 application, or TXB0104DRG4 equivalent, this page delivers verified electrical specs, SOIC-14 package mapping, real-world use cases in smartphone headsets and tablets, and two validated alternative parts with documented functional and supply-chain trade-offs.

Technical Context

The TXB0104DRG4 implements auto-sensing bidirectional translation without external direction control-data flow direction is determined dynamically by relative voltage transitions on A and B ports. Its dual-rail architecture isolates VCCA and VCCB domains, enabling independent power sequencing and VCC isolation: if either supply drops to GND, all outputs enter high-impedance state.

OE input is referenced to VCCA and controls tri-state operation of all four channels simultaneously. The device supports I_OFF protection, preventing backflow current during partial power-down, and meets JESD78 Class II latch-up immunity (>100mA).

Key Specifications

Pinout & Package

TXB0104DRG4 uses a 14-pin SOIC (D) package measuring 8.65mm × 3.91mm, with standard JEDEC MS-012AC footprint and 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 MAX13035EASA+, TXB0104DRG4 uniquely combines auto-direction sensing, 5V-tolerant B port, and ±15kV HBM protection-making it the only option for compact, field-exposed, mixed-voltage mobile interfaces requiring zero-DIR routing and highest ESD resilience.

Availability

TXB0104DRG4 is available at Aetrix Electronics and suitable for smartphone headset interfaces, tablet sensor hubs, desktop PC front-panel controllers, and industrial USB-C docking stations requiring stable component supply across extended product lifecycles.

Supply support for TXB0104DRG4 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 solutions, with decades of expertise in precision level-shifting and interface ICs.

The TXB0104 family was designed specifically for space-constrained, battery-powered consumer electronics requiring robust, auto-sensing bidirectional translation between disparate logic families without external direction control.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of TXB0104DRG4?

VCCA must not exceed VCCB under any operating condition-this is a hard design constraint enforced by internal circuitry. The absolute maximum ratings allow VCCA up to 4.6V and VCCB up to 6.5V, but functional operation requires VCCA ≤ VCCB. For example, VCCA = 3.3V is valid only with VCCB ≥ 3.3V (e.g., 3.3V or 5V), never with VCCB = 2.5V. Exceeding this violates the device's translation architecture and may cause undefined output states or increased leakage.

Does TXB0104DRG4 support true 5V-tolerant inputs on the B port?

Yes, TXB0104DRG4 supports 5V-tolerant inputs on the B port: its absolute maximum input voltage rating is –0.5V to 6.5V, and recommended operating conditions specify VCCB up to 5.5V. When VCCB = 5V, B-port inputs accept 0–5V logic levels while driving A-port outputs referenced to VCCA (e.g., 1.8V). This enables direct interfacing with legacy 5V peripherals without external resistive dividers or clamping diodes.

How does the OE pin function, and what is the recommended pull-down resistor value for safe power-up behavior of TXB0104DRG4?

The OE pin is an active-low enable referenced to VCCA; pulling OE low places all A/B port outputs in high-impedance state. To ensure tri-state during power-up, TI recommends tying OE to GND through a pulldown resistor. The minimum value depends on the current sourcing capability of the driver controlling OE-typically 10kΩ suffices for most microcontroller GPIOs, but values as low as 4.7kΩ are used when fast disable timing (<1µs) is critical. Never leave OE floating.

Can TXB0104DRG4 translate between 1.2V and 5V logic levels in both directions simultaneously?

Yes-TXB0104DRG4 performs true bidirectional translation: a 1.2V signal on A1 drives a 5V-compatible output on B1, and a 5V signal on B1 drives a 1.2V-compatible output on A1-all within the same device and without direction control. This is enabled by its auto-sensing architecture and dual-rail I/O buffers. However, VCCA must be set to 1.2V and VCCB to 5V; swapping supplies violates the VCCA ≤ VCCB requirement and will cause malfunction.

What thermal considerations apply to TXB0104DRG4 in a SOIC-14 package under continuous 100Mbps operation?

In SOIC-14 (TXB0104DRG4), R_θJA = 90.7°C/W. At 100Mbps with VCCA = 3.3V/VCCB = 5V, typical power dissipation is ~12mW. With 25°C ambient, junction temperature rise is ~1.1°C-well within the –40°C to 85°C operating range. No heatsinking is required, but ensure ≥0.5mm clearance around the package and avoid copper pours directly under pins 1 and 14 to maintain specified thermal resistance.