Texas Instruments TXB0101DBVR

Overview

TXB0101DBVR 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 5 μA max ICC. It enables level-shifting between low-voltage logic domains in portable consumer interfaces.

For engineers reviewing the TXB0101DBVR datasheet, TXB0101DBVR pinout, TXB0101DBVR application, or TXB0101DBVR equivalent, key selection considerations include VCCA/VCCB voltage compatibility, auto-direction operation without control lines, Ioff partial-power-down support, high-impedance state during power sequencing, and SOT-23-6 package footprint constraints.

Technical Context

The TXB0101DBVR implements a buffered, edge-accelerated architecture using one-shot circuits to enhance rise/fall times-PMOS/NMOS transients reduce transition delays without external direction control. Its dual-rail design isolates A-port (VCCA-referenced) and B-port (VCCB-referenced) logic domains while enforcing VCCA ≤ VCCB for safe operation.

VCC isolation ensures all outputs enter high-impedance when either VCCA or VCCB = GND; OE input (VCCA-referenced) provides synchronous 3-state control. The device supports push-pull CMOS only-not open-drain protocols like I²C-and requires external pull resistors >50 kΩ if used on capacitive buses.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXB0101DBVR, TXS0101DCKR enables open-drain protocols but sacrifices push-pull speed and VCC isolation, while SN74AVC1T45DBVR offers higher drive strength but adds complexity via DIR control and lacks integrated ESD protection - making TXB0101DBVR optimal for compact, high-ESD-risk, auto-direction applications.

Availability

TXB0101DBVR is available at Aetrix Electronics and suitable for smartphone baseband interfaces, tablet SoC-peripheral bridges, and industrial handheld HMIs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TXB0101DBVR 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 delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in power management and signal chain technologies.

The TXB0101DBVR belongs to TI's voltage translator product line, engineered specifically for ultra-low-power, auto-directional logic-level bridging in space-constrained portable electronics where supply sequencing and ESD resilience are critical.

FAQ

What voltage ranges does the TXB0101DBVR support on its A and B ports?

The TXB0101DBVR supports 1.2V to 3.6V on the A port (VCCA) and 1.65V to 5.5V on the B port (VCCB), with the strict requirement that VCCA must not exceed VCCB. This enables translation between common low-voltage domains (e.g., 1.2V, 1.8V) and higher-voltage peripherals (e.g., 3.3V, 5V). The TXB0101DBVR datasheet specifies absolute maximum ratings up to 4.6V on VCCA and 6.5V on VCCB, but recommended operation stays within the stated ranges.

Does the TXB0101DBVR require a direction-control signal?

No, the TXB0101DBVR uses auto direction-sensing circuitry and does not require an external direction-control signal. Its internal one-shot edge detectors identify rising/falling edges on either port and dynamically enable the appropriate driver - enabling seamless bidirectional data flow on a single line. This eliminates GPIO overhead and simplifies firmware design compared to direction-controlled alternatives like the SN74AVC1T45DBVR.

How does the TXB0101DBVR handle power sequencing when VCCA and VCCB ramp at different times?

The TXB0101DBVR features VCC isolation: if either VCCA or VCCB is at GND, all outputs automatically enter high-impedance state - preventing bus contention or backdrive damage. During power-up, VCCA may ramp before or after VCCB without risk, as the device remains safely disabled until both supplies are valid. This behavior is intrinsic to the TXB0101DBVR architecture and requires no external sequencing circuitry.

Can the TXB0101DBVR be used for I²C or SMBus level translation?

No, the TXB0101DBVR is designed exclusively for push-pull CMOS logic and cannot translate open-drain protocols like I²C or SMBus. Its output drivers lack the weak pull-up behavior required for wired-AND bus operation. For those applications, Texas Instruments recommends the TXS0101DCKR - a functionally distinct part optimized for open-drain signaling. Using TXB0101DBVR on an I²C bus would cause communication failure.

What is the maximum data rate supported by the TXB0101DBVR, and under what conditions?

The TXB0101DBVR supports up to 100 Mbps maximum data rate when VCCA = 3.3V ± 0.3V and VCCB = 3.3V or 5V, as verified in the switching characteristics tables (Sections 5.20–5.21). At lower VCCA (e.g., 1.2V), the max rate drops to 20 Mbps. The actual achievable rate depends on load capacitance, trace length, and noise margin - the TXB0101DBVR's edge-accelerated architecture maintains clean transitions even at rated speeds.