Texas Instruments TXS0101DRLRG4

Overview

TXS0101DRLRG4 from Texas Instruments is a 1-bit bidirectional auto-sensing voltage-level translator for open-drain and push-pull logic interfaces, supporting 1.65V–3.6V on A port and 2.3V–5.5V on B port (VCCA ≤ VCCB), with 24Mbps max data rate in push-pull mode and integrated 10kΩ pullups, used in smartphone I²C bus bridging between 1.8V sensors and 3.3V controllers.

For engineers reviewing the TXS0101DRLRG4 datasheet, TXS0101DRLRG4 pinout, TXS0101DRLRG4 application, or TXS0101DRLRG4 equivalent, this page delivers verified electrical specs, SOT-5X3 package details, real-world timing behavior across VCCA/VCCB combinations, ESD robustness (±8kV HBM on B port), and validated alternative parts for voltage translation design-in.

Technical Context

The TXS0101DRLRG4 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 direction control. It requires no external pullups for open-drain operation due to integrated 10kΩ resistors referenced to VCCA and VCCB respectively.

VCC isolation ensures high-impedance state when either VCCA or VCCB is at GND; no power-supply sequencing is needed-either rail may ramp first-and I_off enables partial-power-down mode with leakage < ±2µA per port at 0V supply.

Key Specifications

Pinout & Package

SOT-5X3 (DRL) package: 1.6mm × 1.6mm, 6-pin ultra-small outline, optimized for space-constrained mobile PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0101DRLRG4, TXS0102DRLR offers channel density but no pin compatibility, while TXB0101DCKR provides stronger active drive at the cost of higher quiescent current and incompatible enable logic-neither is drop-in replaceable.

Availability

TXS0101DRLRG4 is available at Aetrix Electronics and suitable for smartphone sensor hubs, tablet display power sequencing, industrial handheld terminals, desktop PC SMBus bridges, and embedded IoT gateways requiring stable component supply across high-volume consumer electronics programs.

Supply support for TXS0101DRLRG4 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 headquartered in Dallas, Texas, designing analog and embedded processing chips for industrial, automotive, and personal electronics markets.

The TXS0101DRLRG4 belongs to TI's NanoFree™ voltage translator family, engineered specifically for ultra-compact, no-direction-control bidirectional level shifting in space- and power-constrained portable devices.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of TXS0101DRLRG4?

The TXS0101DRLRG4 requires VCCA ≤ VCCB at all times during normal operation. While VCCA may briefly exceed VCCB during power-up without damage, sustained violation causes undefined behavior and potential latch-up. The absolute maximum ratings allow VCCA up to 4.6V and VCCB up to 6.5V independently-but the functional constraint VCCA ≤ VCCB must hold continuously once powered. For example, 3.3V on VCCA and 5.0V on VCCB is valid; 5.0V on VCCA and 3.3V on VCCB is not.

Does TXS0101DRLRG4 require external pullup resistors for I²C open-drain operation?

No-TXS0101DRLRG4 integrates 10kΩ pullup resistors on both A and B ports, referenced to VCCA and VCCB respectively. These eliminate the need for external pullups in standard I²C applications operating within 2Mbps (open-drain mode). If faster rise times or lower bus capacitance tolerance are required, external parallel pullups may be added-but they are not mandatory for basic I²C compliance.

How does the auto-direction-sensing feature of TXS0101DRLRG4 work without a direction-control pin?

TXS0101DRLRG4 uses a pass-gate architecture with edge-detecting one-shot circuits on each port. When a rising edge occurs on either A or B, the corresponding one-shot briefly activates PMOS transistors to accelerate the transition. This eliminates the need for an external DIR signal-the device inherently senses data flow direction based on voltage transitions, enabling true bidirectional communication on a single line.

Can TXS0101DRLRG4 be used in a 5V-to-1.8V level translation scenario?

Yes-TXS0101DRLRG4 supports VCCB = 5.0V and VCCA = 1.8V (within 1.65V–3.6V range), satisfying the VCCA ≤ VCCB requirement. In this configuration, the A port interfaces with 1.8V logic and the B port with 5V logic. The device translates both high-to-low and low-to-high transitions bidirectionally, with propagation delays as low as 2.6ns (B→A) and 4.4ns (A→B) at these voltages-verified in TI's switching characteristics tables.

What thermal derating applies to TXS0101DRLRG4 in its SOT-5X3 (DRL) package?

In the DRL package, TXS0101DRLRG4 has a junction-to-ambient thermal resistance (R_θJA) of 207.5°C/W. At maximum ambient temperature (85°C) and full 14.4µA supply current, self-heating is negligible (<0.003°C). However, under worst-case I/O loading (±50mA), localized heating must be managed via PCB copper pour-TI specifies R_θJB = 88.5°C/W to board, meaning 1cm² of 1oz copper reduces thermal impedance significantly. No heatsink is required for typical logic-level translation loads.