Texas Instruments SN74AVC8T245RHLR

Overview

SN74AVC8T245RHLR from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.2 V–3.6 V domains, featuring configurable VCCA/VCCB rails, 3-state outputs, Ioff partial-power-down support, and up to 320 Mbps data rate at ≥1.8 V supplies - used in low-voltage interconnects between SoC I/O and peripheral buses.

For engineers reviewing the SN74AVC8T245RHLR datasheet, SN74AVC8T245RHLR pinout, SN74AVC8T245RHLR application, or SN74AVC8T245RHLR equivalent, key selection criteria include dual-rail supply flexibility (1.2–3.6 V per rail), 4.6-V I/O tolerance, VCC isolation behavior, DIR/OE control referenced to VCCA, and thermal performance in the 5.5 mm × 3.5 mm VQFN package.

Technical Context

The SN74AVC8T245RHLR implements asynchronous bidirectional data flow controlled by DIR (VCCA-referenced) and OE (VCCA-referenced), with A-port I/Os tied to VCCA and B-port I/Os tied to VCCB. Its dual-rail architecture enables independent operation across 1.2 V–3.6 V, supporting translation between mismatched logic families including 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V nodes.

It integrates VCC isolation: if either VCCA or VCCB is at GND, all I/Os enter high-impedance state. Ioff circuitry ensures <±5 µA leakage during partial power-down, and 4.6-V tolerant I/Os allow safe interfacing with higher-voltage systems without external level-shifting components.

Key Specifications

Pinout & Package

The SN74AVC8T245RHLR is housed in a 24-pin VQFN (RHL) package measuring 5.5 mm × 3.5 mm with exposed thermal pad, optimized for thermal dissipation and space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC8T245RHLR, SN74AVCH8T245RHLR adds bus-hold for passive input stabilization at no layout cost, while TXB0108RHLR trades DIR control and speed for automatic direction detection - making SN74AVC8T245RHLR optimal for manually arbitrated, high-speed, multi-drop bus translation.

Availability

SN74AVC8T245RHLR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, and enterprise SSD controller interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74AVC8T245RHLR 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 for industrial, automotive, and communications markets.

The SN74AVC8T245RHLR belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered for ultra-low-voltage bidirectional translation in space- and power-constrained systems requiring robust noise immunity and wide supply flexibility.

FAQ

What is the minimum operating voltage for SN74AVC8T245RHLR on VCCA and VCCB?

The SN74AVC8T245RHLR operates down to 1.2 V on both VCCA and VCCB rails, as confirmed in Section 5.3 Recommended Operating Conditions. This allows interoperability with emerging 1.2-V core logic and LPDDR4/5 I/O standards while maintaining full functionality including DIR/OE control and 3-state output behavior.

Does SN74AVC8T245RHLR support automatic direction detection like the TXB series?

No, SN74AVC8T245RHLR requires explicit DIR pin control to determine data flow direction (A→B or B→A). Unlike auto-sensing transceivers such as TXB0108RHLR, it provides deterministic, externally managed bidirectional control - essential for shared-bus arbitration, synchronous protocols, and systems where direction must be synchronized with clock or state machine logic.

How does the VCC isolation feature behave in SN74AVC8T245RHLR during power sequencing?

When either VCCA or VCCB is driven to GND while the other rail remains powered, SN74AVC8T245RHLR automatically places all A- and B-port I/Os into high-impedance state. This prevents current backflow and protects active circuitry - a critical safeguard during asymmetric power-up/down sequences common in modular systems and hot-swap architectures.

Can SN74AVC8T245RHLR safely interface with 5-V logic signals?

SN74AVC8T245RHLR I/Os are rated for 4.6-V absolute maximum input voltage (per Section 5.1 Absolute Maximum Ratings), not 5 V. While 4.6-V tolerance accommodates 3.3-V systems with overshoot, direct connection to nominal 5-V logic violates absolute ratings and risks permanent damage. Use only with 3.3-V or lower signaling domains.

What is the thermal performance of SN74AVC8T245RHLR in its RHL package?

The SN74AVC8T245RHLR in the 24-pin VQFN (RHL) package has a junction-to-ambient thermal resistance (RθJA) of 36.8 °C/W (Section 5.4 Thermal Information). With its exposed thermal pad and low RθJB (15.7 °C/W), it sustains full-speed operation in compact, thermally constrained layouts - especially when paired with 2+ internal copper layers and thermal vias under the pad.