Texas Instruments TXS0102DCTT

Overview

TXS0102DCTT from Texas Instruments is a 2-bit bidirectional voltage-level translator using pass-gate architecture with edge-rate accelerators, supporting 1.65V–3.6V on A port and 2.3V–5.5V on B port (VCCA ≤ VCCB), delivering up to 24Mbps push-pull or 2Mbps open-drain data rates in I²C, SMBus, and GPIO interfacing between mixed-voltage microcontrollers and peripherals.

For engineers reviewing the TXS0102DCTT datasheet, TXS0102DCTT pinout, TXS0102DCTT application, or TXS0102DCTT equivalent, this page delivers verified electrical specs, DCT (SSOP-8) package mapping, real-world timing behavior under open-drain vs. push-pull loads, VCC isolation behavior, and validated alternatives for voltage translation in space-constrained industrial and embedded designs.

Technical Context

The TXS0102DCTT implements auto-direction-sensing via dual N-channel pass-gate transistors with gate bias set ~1 VT above the lower-rail VCC, eliminating need for direction-control signals. Each channel independently detects signal flow direction by monitoring relative voltage levels across A and B ports.

Integrated one-shot edge-rate accelerators reduce output rise time by temporarily lowering effective output impedance to 50Ω–70Ω for ~30ns during low-to-high transitions, enabling 24Mbps operation while maintaining compatibility with standard 10kΩ open-drain pull-ups on both ports.

Key Specifications

Pinout & Package

TXS0102DCTT uses the DCT package: 8-pin SSOP (2.95mm × 4mm), surface-mount, leaded, RoHS-compliant, with 0.65mm pitch and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXB0102RGTR and SN74AVC4T245RTER, the TXS0102DCTT uniquely combines auto-direction sensing, integrated pull-ups, and VCC isolation-making it optimal for I²C/SMBus where pin count, layout simplicity, and power sequencing robustness are critical.

Availability

TXS0102DCTT is available at Aetrix Electronics and suitable for I²C bus translation, GPIO bridging, UART level shifting, and SMBus peripheral interfacing requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and medical OEM programs.

Supply support for TXS0102DCTT 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 TXS0102DCTT belongs to TI's Switch-type voltage translator family, engineered specifically for seamless, directionless logic-level bridging in mixed-voltage embedded systems where space, power, and design simplicity are constrained.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the TXS0102DCTT?

The TXS0102DCTT requires VCCA ≤ VCCB at all times. The absolute maximum is VCCA = 3.6V and VCCB = 5.5V, yielding a 1.9V differential. Operation outside this constraint risks pass-gate misbiasing and signal corruption. Per Section 5.3, VCCA must never exceed VCCB - for example, 3.3V A-port to 2.5V B-port is invalid. The TXS0102DCTT is designed strictly for upward translation only.

Does the TXS0102DCTT support I²C clock stretching, and how does it handle low-speed (100kHz) Standard-mode operation?

Yes, the TXS0102DCTT fully supports I²C clock stretching because its auto-direction sensing responds dynamically to bus state changes without fixed direction latching. At 100kHz Standard-mode, the device operates well within its 2Mbps open-drain rating, with typical VOL(Bx) < 0.25V at 3mA sink - meeting I²C specification requirements. The TXS0102DCTT's integrated 10kΩ pull-ups ensure compliant rise times without external components.

Can the TXS0102DCTT be used with 1.2V logic on the A port?

No - the TXS0102DCTT specifies a minimum A-port supply of 1.65V (Section 5.3). Applying 1.2V to VCCA violates recommended operating conditions and causes unreliable pass-gate turn-on, leading to elevated VOL, increased propagation delay, and potential data corruption. For 1.2V interfaces, TI recommends the TXB0102 or SN74AXC series. The TXS0102DCTT is not rated for 1.2V operation.

How does the OE pin behave during power-up, and what is the recommended pull-down resistor value?

The OE pin is referenced to VCCA and must be held low during power-up to ensure all I/Os remain in high-impedance until both supplies stabilize. TI recommends a 10kΩ pulldown resistor from OE to GND (Section 3). This value guarantees reliable disable while accommodating typical MCU I/O leakage (<1µA) and avoids excessive current draw. The TXS0102DCTT's OE input threshold is VCCA × 0.35 (max), so 10kΩ ensures solid low-state even with weak drivers.

What thermal derating applies to the TXS0102DCTT in a 2-layer PCB with no copper pour under the DCT package?

In a 2-layer board with minimal copper, the TXS0102DCTT's RθJA is 168.5°C/W (Table 5.4). At 85°C ambient and 14.4µA max combined supply current, self-heating is negligible (<0.003°C). However, under worst-case 50mA per I/O switching, junction temperature rise remains <1°C - well below the 150°C absolute max. No thermal derating is needed for typical operation; the DCT package's thermal performance is sufficient for industrial ambient conditions without heatsinking.