Texas Instruments SN74AVC2T45YZTR

Overview

SN74AVC2T45YZTR from Texas Instruments is a 2-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V domains. It features independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) rails, 4.6V I/O overvoltage tolerance, Ioff partial-power-down support, and VCC isolation. It serves as a configurable interface IC in mobile SoC interconnects where mixed-voltage subsystems require reliable data exchange.

For engineers reviewing the SN74AVC2T45YZTR datasheet, SN74AVC2T45YZTR pinout, SN74AVC2T45YZTR application, or SN74AVC2T45YZTR equivalent, key selection criteria include its dual-rail level-shifting capability, DIR-controlled directionality, 8-pin DSBGA package footprint, thermal performance (RθJB = 10.8°C/W), and compatibility with high-speed interfaces up to 500Mbps in 1.8V→3.3V translation.

Technical Context

This device implements a non-inverting, asynchronous bus transceiver architecture with two independently powered I/O ports (A and B), each supporting 1.2V–3.6V operation. Direction control is managed solely by the DIR input referenced to VCCA - no OE pin is present, and output enable/disable is implicit via DIR state and power rail conditions.

The transceiver enforces strict CMOS input biasing: all A- and B-port inputs must be held HIGH or LOW at all times to prevent leakage; floating inputs are prohibited. Its VCC isolation logic forces both ports into high-impedance when either VCCA or VCCB = 0V, preventing false logic propagation during power sequencing.

Key Specifications

Pinout & Package

SN74AVC2T45YZTR uses an 8-pin DSBGA (YZP) package measuring 1.89mm × 0.89mm with bottom-side ball layout. This ultra-compact NanoFree™ package places the silicon die directly in the system, eliminating wire bonds and reducing parasitic inductance for high-speed signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74LVC2T45YZPR and TXS0102DCUR, SN74AVC2T45YZTR delivers superior speed, lower static power, and guaranteed VCC isolation - making it the optimal choice for safety-critical, high-bandwidth, mixed-voltage mobile SoC interconnects.

Availability

SN74AVC2T45YZTR is available at Aetrix Electronics and suitable for smartphone baseband interfaces, eMMC/SDIO host bridges, and wearable sensor hub designs requiring stable component supply, consistent DSBGA packaging, and full production lifecycle support.

Supply support for SN74AVC2T45YZTR 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 experience in high-reliability interface solutions.

The SN74AVC2T45YZTR belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage, high-speed bidirectional level translation in space-constrained portable electronics.

FAQ

What is the maximum supported data rate for SN74AVC2T45YZTR in 1.8V-to-3.3V translation?

The SN74AVC2T45YZTR supports up to 500Mbps in 1.8V-to-3.3V level-shifting mode, as specified in the official datasheet under "Max Data Rates." This performance is achieved with typical propagation delays below 2.5ns and is validated across the full operating temperature range (–40°C to +85°C). The SN74AVC2T45YZTR maintains this rate without derating under standard load conditions (CL = 15pF).

Does SN74AVC2T45YZTR require external pull-up or pull-down resistors on the DIR pin?

No, SN74AVC2T45YZTR does not require external pull-up or pull-down resistors on the DIR pin. The DIR input is internally biased and referenced to VCCA; it accepts clean logic HIGH (≥VCCA × 0.65) or LOW (≤VCCA × 0.35) signals directly. External resistors may degrade edge rate and are unnecessary unless system-level noise immunity mandates them - which is not specified in the SN74AVC2T45YZTR datasheet.

Can SN74AVC2T45YZTR operate with VCCA = 1.2V and VCCB = 3.3V simultaneously?

Yes, SN74AVC2T45YZTR is fully rated for simultaneous operation with VCCA = 1.2V and VCCB = 3.3V. Its dual-rail architecture explicitly supports this configuration, delivering 320Mbps data rate and maintaining valid logic thresholds on both sides. The 4.6V I/O tolerance ensures B-port pins safely withstand 3.3V outputs while A-port inputs remain compatible with 1.2V logic levels - all per Section 5.3 of the SN74AVC2T45YZTR datasheet.

What is the thermal resistance (RθJB) of SN74AVC2T45YZTR in its YZP package?

The junction-to-board thermal resistance (RθJB) of SN74AVC2T45YZTR in the 8-pin DSBGA (YZP) package is 10.8°C/W, as documented in Section 5.4 "Thermal Information" of the datasheet. This low value - significantly better than SSOP (111.0°C/W) or VSSOP (158.4°C/W) variants - results from the direct-die thermal path in NanoFree™ packaging and supports sustained operation in thermally dense mobile PCB layouts.

Is SN74AVC2T45YZTR compatible with I²C open-drain signaling?

SN74AVC2T45YZTR can be used in I²C applications but requires careful design: it is not inherently open-drain and must be configured with external pull-ups on both A and B sides. When DIR is fixed, it functions as a level-shifting buffer; bidirectional use demands system-level arbitration. Unlike dedicated I²C translators (e.g., PCA9306), SN74AVC2T45YZTR does not auto-sense direction - so it is suitable only for controlled, non-contention I²C extensions where timing and drive strength are verified per SN74AVC2T45YZTR's VOL/VOH specs.