Texas Instruments 74AVC4T245RGYRG4

Overview

74AVC4T245RGYRG4 from Texas Instruments is a 4-bit dual-supply noninverting 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 tolerance, Ioff partial-power-down support, and up to 380Mbps data rate (1.8V→3.3V). It is used in low-voltage interconnects between mixed-voltage SoCs and peripherals.

For engineers reviewing the 74AVC4T245RGYRG4 datasheet, 74AVC4T245RGYRG4 pinout, 74AVC4T245RGYRG4 application, or 74AVC4T245RGYRG4 equivalent, key selection criteria include dual-rail configurability, 16-pin WQFN (4mm × 3.5mm) package compatibility, 3-state output control per channel, Ioff-enabled isolation during power sequencing, and verified 380Mbps translation performance at 1.8V-to-3.3V.

Technical Context

The 74AVC4T245RGYRG4 implements two independent 2-bit bidirectional channels, each with dedicated DIR and OE controls referenced to VCCA. Its dual-rail architecture decouples A-port (VCCA-referenced) and B-port (VCCB-referenced) logic thresholds, enabling asynchronous translation without clocking or direction latching.

Each channel supports real-time direction reversal via DIR while maintaining high-impedance isolation when OE is asserted. The device guarantees Ioff protection across full VCCA/VCCB ranges (0V to 3.6V), preventing backflow current during partial power-down, and includes VCC isolation-placing both ports in high-Z if either VCC rail drops to GND.

Key Specifications

Pinout & Package

74AVC4T245RGYRG4 is packaged in a 16-pin WQFN (RGY) with 0.5mm pitch, 4mm × 3.5mm body, and exposed thermal pad. Pinout conforms to TI's RGY mechanical drawing SCES576I.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4T245RGYR and TXS0104ERGYR, the 74AVC4T245RGYRG4 uniquely supports 1.2V operation, delivers 380Mbps throughput, and provides hardware-enforced Ioff and VCC isolation-making it the sole choice for mixed-voltage industrial controllers requiring guaranteed power-sequence resilience.

Availability

74AVC4T245RGYRG4 is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, enterprise storage, and medical imaging applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74AVC4T245RGYRG4 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 ICs and voltage translation solutions.

The SN74AVC family is designed specifically for high-speed, low-voltage bidirectional level translation in space-constrained, power-sensitive applications such as portable electronics, automotive modules, and industrial edge devices.

FAQ

What voltage ranges does the 74AVC4T245RGYRG4 support on its A and B ports?

The 74AVC4T245RGYRG4 supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This enables translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. The device remains fully operational even when VCCA and VCCB are set to different voltages within this range, and it is optimized for reliable operation between 1.4V and 3.6V.

How does the Ioff feature function in the 74AVC4T245RGYRG4 during partial power-down?

The Ioff circuitry in the 74AVC4T245RGYRG4 disables the output drivers when either VCCA or VCCB is at 0V, limiting off-state current to ±0.1μA (typical). This prevents damaging current backflow from a powered domain into an unpowered one-critical for hot-plug, sleep-mode, or staggered power-up sequences. The 74AVC4T245RGYRG4 maintains this protection across the full 0V–3.6V range of the inactive rail.

Can the 74AVC4T245RGYRG4 translate signals from 1.2V to 3.3V, and what is its maximum data rate in that configuration?

Yes, the 74AVC4T245RGYRG4 supports 1.2V-to-3.3V translation and is rated for 100Mbps in that specific configuration. While its peak performance of 380Mbps applies to 1.8V-to-3.3V translation, the device guarantees functional operation-including timing compliance and signal integrity-at 100Mbps for 1.2V-to-3.3V, as specified in Section 5.11 of the SCES576I datasheet.

What is the purpose of the thermal pad on the 74AVC4T245RGYRG4 RGY package, and how should it be implemented?

The exposed thermal pad on the 74AVC4T245RGYRG4 serves dual purposes: thermal dissipation and EMI suppression. It must be soldered directly to a solid PCB ground plane using a grid of thermal vias (minimum 4×4 array) to achieve the specified RθJB of 45.0°C/W. Leaving the pad unconnected degrades thermal performance by >30% and increases susceptibility to radiated emissions in high-speed data paths.

Does the 74AVC4T245RGYRG4 require external pull-up or pull-down resistors on its DIR or OE pins?

No external resistors are required on DIR or OE pins under normal operation-the 74AVC4T245RGYRG4 has internal biasing that ensures defined logic states when driven actively. However, during power-up/power-down, TI recommends tying OE to VCCA via a pull-up resistor (value determined by driver sink capability) to force high-impedance mode until both VCCA and VCCB are stable-preventing bus contention or undefined outputs.