Texas Instruments TXB0104YZTR

Overview

TXB0104YZTR 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-power, space-constrained interconnects between mixed-voltage domains in portable consumer electronics.

For engineers reviewing the TXB0104YZTR datasheet, TXB0104YZTR pinout, TXB0104YZTR application, or TXB0104YZTR equivalent, this page delivers verified electrical specs, DSBGA-12 package details, real-world use cases in smartphones and headsets, and two validated alternative parts with functional and layout implications.

Technical Context

The TXB0104YZTR 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 drops to GND; OE input-referenced to VCCA-provides synchronous tri-state control. The device meets JESD78 Class II latch-up immunity (>100mA) and supports partial power-down via I_OFF, blocking back-current during VCCB-only operation.

Key Specifications

Pinout & Package

TXB0104YZTR uses a 12-pin DSBGA package (1.40mm × 1.90mm) with 0.4mm pitch, optimized for ultra-compact mobile PCB layouts. The die attach pad is non-functional; no thermal pad connection required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC4T245RTER and PCA9306DCUR, TXB0104YZTR uniquely combines auto-direction sensing, 4-channel density, ±15kV B-port ESD, and DSBGA-12 footprint-making it optimal for space-constrained, mixed-voltage, full-duplex interfaces where GPIO count and ESD resilience are critical.

Availability

TXB0104YZTR is available at Aetrix Electronics and suitable for smartphone baseband interfaces, tablet display bridges, headset audio codec links, and desktop PC USB hub control requiring stable component supply across high-volume consumer electronics production.

Supply support for TXB0104YZTR 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 for industrial, automotive, and consumer markets.

The TXB0104YZTR belongs to TI's voltage translation product line, engineered specifically for ultra-low-power, high-density bidirectional interfacing in portable electronics with stringent ESD and footprint requirements.

FAQ

What voltage ranges does the TXB0104YZTR support on its A and B ports?

The TXB0104YZTR supports 1.2V to 3.6V on the A port and 1.65V to 5.5V on the B port, with the constraint that VCCA must not exceed VCCB. This enables translation between common logic families including 1.2V/1.5V/1.8V processors and 3.3V/5V peripherals. The device maintains valid logic thresholds and output drive strength across the full operating range, as confirmed in Sections 5.3 and 5.5 of the official datasheet.

Does the TXB0104YZTR require an external direction-control signal?

No, the TXB0104YZTR features automatic direction sensing and requires no external DIR pin. It detects signal direction dynamically by monitoring relative voltage levels on A and B ports, enabling true bidirectional communication on each channel without firmware intervention. This behavior is intrinsic to the TXB0104YZTR design and eliminates the need for additional GPIO resources or timing-critical control sequencing.

How does the TXB0104YZTR handle power sequencing when VCCA and VCCB ramp at different rates?

The TXB0104YZTR incorporates VCC isolation: if either VCCA or VCCB is driven to GND, all outputs automatically enter high-impedance state. This prevents bus contention and back-driving during asymmetric power-up/down sequences-common in USB-C accessory detection or system sleep/wake transitions. The feature is guaranteed across temperature and voltage corners per Section 4 and 7.4 of the TXB0104YZTR datasheet.

What is the maximum data rate supported by the TXB0104YZTR?

The TXB0104YZTR supports up to 100Mbps when VCCA = 3.3V and VCCB = 3.3V or 5V, as specified in Sections 5.10, 5.11, 5.20, and 5.21 of the datasheet. Propagation delay remains under 4.7ns in this configuration, ensuring reliable timing closure for fast-mode-plus I²C, SDIO, and GPIO expansion applications. Lower VCCA values reduce maximum rate (e.g., 20Mbps at VCCA = 1.2V).

Is the TXB0104YZTR compatible with I²C bus protocols?

Yes, the TXB0104YZTR is widely used for I²C level translation due to its bidirectional auto-sensing, open-drain-compatible outputs, and low propagation delay (<4.7ns at 3.3V). It supports standard (100kHz), fast (400kHz), and fast-mode plus (1MHz) speeds. However, designers must ensure pull-up resistors are placed on both sides of the translator and verify bus capacitance limits, as outlined in Section 8.2 of the TXB0104YZTR application guidance.