Texas Instruments TXU0304DTRR

Overview

TXU0304DTRR from Texas Instruments is a 4-bit fixed-direction dual-supply voltage-level translator with Schmitt-trigger inputs and 3-state outputs, supporting 1.1 V to 5.5 V operation on both A and B ports, up to 200 Mbps (3.3 V → 5.0 V), and operating across –40°C to +125°C for industrial I/O bridging in mixed-voltage microcontroller systems.

For engineers reviewing the TXU0304DTRR datasheet, TXU0304DTRR pinout, TXU0304DTRR application, or TXU0304DTRR equivalent, this device addresses slow/noisy input rejection, push-pull level shifting for UART/SPI/JTAG, mechanical switch debouncing, and GPIO translation where bidirectional auto-sensing is not required and high drive strength (up to 12 mA) and low quiescent current (2.5 µA max at 25°C) are critical.

Technical Context

The TXU0304DTRR implements fixed-direction translation-data flows unidirectionally from A to B or B to A depending on OE logic state-not auto-sensing. Its Schmitt-trigger inputs provide hysteresis (ΔVT = 0.2–1.18 V, dependent on VCC) to reject noise and accommodate slow-rising signals, while integrated static pull-down resistors prevent floating inputs.

VCC isolation (Ioff-float) disables all outputs into high-impedance when either VCCA or VCCB falls below 100 mV; OE control supports referencing to either supply rail, enabling flexible system-level enable sequencing without additional level-shifting circuitry.

Key Specifications

Pinout & Package

X2SON-12 package (1.70 mm × 1.00 mm), thermally enhanced with exposed pad (recommended grounded), optimized for space-constrained PCBs in wearables and sensor modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXB0104RUTR, TXU0304DTRR offers deterministic direction control and superior noise immunity but requires explicit OE management; compared with TXU0104DTRR, it adds one reverse-direction channel (B4→A4Y) enabling JTAG boundary scan or mixed-protocol interfaces without adding a second device.

Availability

TXU0304DTRR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, wearable health monitors, and PLC digital I/O cards requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for TXU0304DTRR 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 and embedded processing solutions, with decades of expertise in precision signal chain and power management ICs.

The TXU0x04 family was designed specifically for robust, low-power, fixed-direction voltage translation in space-constrained, mixed-voltage systems - addressing limitations of auto-sensing translators in noisy, low-slew-rate, or timing-critical applications.

FAQ

What is the maximum supported data rate for TXU0304DTRR in 1.8 V to 3.3 V translation?

The TXU0304DTRR supports up to 100 Mbps in 1.8 V → 3.3 V up-translation mode, as specified in Section 7.6 (TMAX) of the datasheet under "Up Translation" with VCCI = 1.65 V–1.95 V and VCCO = 3.0 V–3.6 V. This enables reliable SPI clock rates up to 50 MHz with margin for setup/hold time.

Does TXU0304DTRR support true bidirectional communication like I²C?

No, TXU0304DTRR does not support true bidirectional communication. It is a fixed-direction translator: A1–A3 drive B1Y–B3Y (A→B), and B4 drives A4Y (B→A). Direction is statically defined by pin assignment - not dynamically sensed like I²C-compatible devices such as the TXB0104. TXU0304DTRR is unsuitable for open-drain bus protocols.

How does the Schmitt-trigger input hysteresis of TXU0304DTRR improve system reliability?

The TXU0304DTRR provides input hysteresis (ΔVT) ranging from 0.2 V to 1.18 V depending on supply voltage - e.g., 0.46 V at 3 V - which prevents multiple output toggles during slow or noisy input transitions. This eliminates external RC filtering or debounce firmware, making it ideal for mechanical switch interfaces and long-trace industrial connections where signal integrity is compromised.

Can TXU0304DTRR be used with only one supply rail powered?

Yes. The TXU0304DTRR features VCC isolation (Ioff-float): if either VCCA or VCCB drops below ~100 mV or is disconnected, all outputs automatically enter high-impedance state. This prevents back-powering, latch-up, or undefined logic states during partial power-down - a key requirement for hot-swap and low-power sleep modes in portable and automotive systems.

What is the thermal pad connection recommendation for TXU0304DTRR in X2SON-12 package?

The thermal pad on the underside of the TXU0304DTRR X2SON-12 package must be soldered to a dedicated PCB copper pour connected to GND. Per Section 7.4, this reduces RθJB (junction-to-board) to 99.1°C/W and improves power dissipation margin. Leaving the pad unconnected degrades thermal performance and risks junction overheating above 125°C under sustained 12 mA load conditions.