Texas Instruments TXS0101DBVR

Overview

TXS0101DBVR from Texas Instruments is a 1-bit bidirectional voltage-level translator with auto-direction sensing, designed for open-drain and push-pull logic interfaces between 1.65V–3.6V (A port) and 2.3V–5.5V (B port) domains. It features integrated 10kΩ pullups on both ports, VCC isolation, no power-supply sequencing requirement, and supports up to 24Mbps in push-pull mode. It is used in mobile system interconnects such as 1.8V processor I²C buses interfacing with 3.3V peripherals.

For engineers reviewing the TXS0101DBVR datasheet, TXS0101DBVR pinout, TXS0101DBVR application, or TXS0101DBVR equivalent, this page delivers verified electrical parameters, package-specific pin functions, real-world timing behavior under defined VCCA/VCCB conditions, and validated alternative options for voltage translation in space-constrained portable electronics designs.

Technical Context

The TXS0101DBVR implements a pass-gate architecture with edge-rate-accelerating one-shot circuits on both A and B ports to enhance low-to-high transition speed without external direction control. Its dual-rail design enables true bidirectional level shifting across non-overlapping voltage domains while maintaining VCCA ≤ VCCB operational constraint.

It integrates 10kΩ internal pullup resistors on each I/O line-referenced to VCCA on A port and VCCB on B port-and supports partial-power-down via Ioff (≤2µA per port at 0V supply). The OE input, referenced to VCCA, places all I/Os in high-impedance state when low, with enable/disable times fixed at 200ns.

Key Specifications

Pinout & Package

TXS0101DBVR uses the DBV package: SOT-23-6, 2.9mm × 2.8mm body size, with gull-wing leads and standard JEDEC MO-178 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0101DBVR, TXS0102DBVR offers channel scalability without altering layout, while TXB0101DCKR trades higher quiescent current for improved drive strength and noise immunity - selection depends strictly on channel count, load capacitance, and power budget constraints.

Availability

TXS0101DBVR is available at Aetrix Electronics and suitable for mobile device manufacturing, wearable electronics production, and industrial human-machine interface (HMI) designs requiring stable component supply and guaranteed long-term sourcing.

Supply support for TXS0101DBVR 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 decades of expertise in interface solutions and power management ICs.

The TXS0101 belongs to TI's NanoFree™ voltage translator family, engineered specifically for space-constrained, low-power portable electronics requiring robust, no-direction-control bidirectional level shifting between mixed-voltage subsystems.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of TXS0101DBVR?

The TXS0101DBVR requires VCCA ≤ VCCB at all times during normal operation. While VCCA ≥ VCCB during power-up does not cause damage, sustained violation of VCCA ≤ VCCB - for example, VCCA = 3.6V and VCCB = 2.5V - risks incorrect logic translation, increased VOL, and potential I/O contention. Always verify supply rail ordering and regulation tolerance in final design.

Does TXS0101DBVR support true bidirectional communication on a single I/O pair without external control signals?

Yes, TXS0101DBVR supports true bidirectional communication on its A–B I/O pair without any direction-control signal. Its auto-direction-sensing pass-gate architecture detects signal edges in real time and enables conduction accordingly. This makes TXS0101DBVR ideal for I²C, SMBus, and other open-drain protocols where direction changes dynamically.

Can TXS0101DBVR be used with 5V-tolerant microcontrollers operating at 1.8V I/O voltage?

Yes, TXS0101DBVR is explicitly designed for this use case: A port accepts 1.65V–3.6V (e.g., 1.8V MCU I/O), B port supports 2.3V–5.5V (e.g., 5V peripheral), with VCCA ≤ VCCB enforced. When VCCA = 1.8V and VCCB = 5V, TXS0101DBVR delivers valid VOHB ≥ 3.3V and VOLB ≤ 0.4V into 5V-tolerant inputs, meeting standard logic thresholds.

What is the role of the OE pin on TXS0101DBVR, and how should it be handled during power-up?

The OE pin on TXS0101DBVR is an active-high output-enable input referenced to VCCA. When OE is low, both A and B ports enter high-impedance state. To ensure Hi-Z during power-up, tie OE to GND via a pull-down resistor (e.g., 10kΩ); TXS0101DBVR's weak internal pulldown is insufficient for guaranteed startup behavior. OE must remain low until both VCCA and VCCB are stable.

How does the integrated 10kΩ pullup on the B port of TXS0101DBVR affect open-drain bus design?

The integrated 10kΩ pullup on the B port of TXS0101DBVR eliminates the need for an external pullup resistor to VCCB in open-drain applications like I²C. This reduces component count, saves PCB area, and ensures consistent rise time (e.g., ~100ns into 10pF load at 5V). If faster rise time is required, an external lower-value resistor can be added in parallel - but total effective pullup must be verified against bus capacitance and speed targets.