Texas Instruments TXB0101DRLT

Overview

TXB0101DRLT from Texas Instruments is a 1-bit bidirectional voltage translator with auto 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, 100 Mbps max data rate at 3.3V/5V, and Ioff partial-power-down capability. It enables level-shifting between low-voltage logic domains in portable consumer interfaces.

For engineers reviewing the TXB0101DRLT datasheet, TXB0101DRLT pinout, TXB0101DRLT application, or TXB0101DRLT equivalent, key selection criteria include VCCA/VCCB voltage compatibility, auto-direction operation without control signals, high-impedance state during power sequencing, ESD robustness for handheld systems, and SOT (DRL) 6-pin package footprint constraints.

Technical Context

The TXB0101DRLT implements edge-accelerated buffered translation using one-shot circuits to enhance rise/fall times-PMOS boost during low-to-high transitions and NMOS boost during high-to-low transitions-enabling up to 100 Mbps operation. Its architecture eliminates need for external direction control by relying on weak output drivers that yield to opposing bus drivers.

VCCA must be ≤ VCCB; isolation logic places all outputs in high-impedance when either supply drops to GND. OE input is referenced to VCCA and controls global 3-state mode, with typical enable/disable times of 1 μs and <31 ns respectively across operating conditions.

Key Specifications

Pinout & Package

SOT (DRL) package: 6-pin, 1.60 mm × 1.20 mm body size, 0.5 mm pitch, thin-profile surface-mount construction optimized for automated assembly and minimal board area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXB0102DRLT and TXS0101DRLT, the TXB0101DRLT delivers higher speed (100 Mbps vs. 60 Mbps) and stronger edge acceleration for push-pull buses, but lacks native open-drain support-making it optimal for GPIO, reset, and clock enable translation where direction autonomy and speed are prioritized.

Availability

TXB0101DRLT is available at Aetrix Electronics and suitable for smartphone, tablet, and desktop PC designs requiring stable component supply, high-volume production scalability, and long-term lifecycle continuity.

Supply support for TXB0101DRLT 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 company delivering analog and embedded processing solutions, with leadership in precision analog, power management, and interface technologies.

The TXB0101 product line targets space-constrained, battery-powered consumer electronics requiring autonomous bidirectional level translation without external direction control or complex power sequencing.

FAQ

What voltage ranges does the TXB0101DRLT support on its A and B ports?

The TXB0101DRLT supports 1.2V to 3.6V on the A port and 1.65V to 5.5V on the B port, with the critical constraint that VCCA must not exceed VCCB. This allows translation between common logic families including 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V domains. The TXB0101DRLT's voltage flexibility makes it suitable for mixed-supply system interconnects where strict rail ordering is impractical.

Does the TXB0101DRLT require an external direction-control signal?

No, the TXB0101DRLT features auto direction-sensing and requires no external direction-control signal. Its internal architecture uses weak output drivers and edge-detecting one-shot circuits to autonomously determine data flow direction based on bus activity. This eliminates PCB routing for DIR lines and simplifies firmware configuration-key advantages over traditional dual-supply translators like the 74LVC series. The TXB0101DRLT achieves this while maintaining full bidirectional throughput.

Can the TXB0101DRLT be used for I²C signal translation?

No, the TXB0101DRLT is not suitable for standard I²C translation because it is designed for push-pull CMOS logic only and cannot emulate open-drain behavior. Attempting to use TXB0101DRLT on I²C buses risks bus contention and protocol failure. For I²C, TI recommends the TXS0101DRLT-a functionally distinct part with open-drain compatibility. The TXB0101DRLT datasheet explicitly excludes I²C and 1-Wire applications.

What is the maximum data rate supported by the TXB0101DRLT?

The TXB0101DRLT supports up to 100 Mbps maximum data rate, achieved when VCCA = 2.5V or 3.3V and VCCB = 2.5V, 3.3V, or 5V. At lower voltages (e.g., VCCA = 1.2V), the max rate drops to 20 Mbps. These values are measured under specified load and transition conditions and reflect guaranteed performance across –40°C to 85°C. The TXB0101DRLT's edge acceleration circuitry enables this high-speed operation without external components.

How does the TXB0101DRLT handle power sequencing and supply loss?

The TXB0101DRLT includes VCC isolation: if either VCCA or VCCB falls to GND, all outputs automatically enter high-impedance state-preventing backdrive and latch-up during uncontrolled power-up/down sequences. Additionally, the Ioff feature limits current to ±1 μA when powered down, protecting connected devices. OE can be tied to GND via a pulldown resistor to ensure defined Hi-Z state during boot. This behavior is intrinsic to the TXB0101DRLT design and requires no external supervision circuitry.