Texas Instruments SN74AVCH16T245VR

Overview

SN74AVCH16T245 from Texas Instruments is a 16-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2 V and 3.6 V domains, featuring independent VCCA (1.2–3.6 V) and VCCB (1.2–3.6 V) rails, Ioff partial-power-down protection, VCC isolation, and bus-hold on all data inputs - deployed in mixed-voltage server backplanes and industrial controller I/O expansion.

For engineers reviewing the SN74AVCH16T245 datasheet, SN74AVCH16T245 pinout, SN74AVCH16T245 application, or SN74AVCH16T245 equivalent, key selection criteria include configurable level-shifting directionality, 4.6 V I/O tolerance, tri-state output control per port pair, latch-up immunity (>100 mA), and ESD robustness (8 kV HBM).

Technical Context

The SN74AVCH16T245 implements a fully dual-rail architecture where A-port I/Os track VCCA and B-port I/Os track VCCB, with control inputs (1DIR, 2DIR, 1OE, 2OE) referenced exclusively to VCCA. Its logic-level translation operates asynchronously without clocks or internal state machines.

Direction control is implemented via DIR pins: high enables A→B transmission, low enables B→A transmission; OE pins independently disable outputs into high-impedance. The VCC isolation feature forces both ports into high-Z if either VCCA or VCCB drops to GND, preventing bus contention during power sequencing.

Key Specifications

Pinout & Package

SN74AVCH16T245 is packaged in a 48-pin TVSOP (DGV) with nominal body size 9.70 mm × 4.40 mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16T245 and TXB0108PWR, the SN74AVCH16T245 uniquely delivers full 1.2–3.6 V dual-rail configurability, VCC isolation, and Ioff - making it the only option for mixed-voltage hot-swap systems requiring guaranteed bus integrity during asymmetric power loss.

Availability

SN74AVCH16T245 is available at Aetrix Electronics and suitable for enterprise server backplanes, industrial PLC I/O modules, and telecom line cards requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74AVCH16T245 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 solutions, with over 50 years of innovation in high-reliability interface ICs.

The SN74AVCH16T245 belongs to TI's AVC advanced CMOS logic family, engineered specifically for low-voltage, multi-rail system interconnect in data center, industrial automation, and communications infrastructure.

FAQ

What voltage ranges does the SN74AVCH16T245 support on its A and B ports?

The SN74AVCH16T245 supports independent supply voltages from 1.2 V to 3.6 V on both VCCA and VCCB rails. This allows translation between any combination of low-voltage nodes - including 1.2 V ↔ 1.5 V, 1.8 V ↔ 2.5 V, and 1.8 V ↔ 3.3 V - with full functionality across the entire range. Each port's I/Os are referenced to their respective supply, ensuring correct logic threshold tracking.

How does the VCC isolation feature work in the SN74AVCH16T245?

The VCC isolation feature in the SN74AVCH16T245 ensures that if either VCCA or VCCB drops to GND, both A and B ports automatically enter a high-impedance state - regardless of DIR or OE logic levels. This prevents false logic signals or bus contention during power-up/down sequences or single-rail failure, a critical safeguard in redundant power architectures used in telecom and industrial systems.

Does the SN74AVCH16T245 require external pullup or pulldown resistors on data lines?

No, the SN74AVCH16T245 integrates active bus-hold circuitry on all A- and B-port data inputs, which maintains valid logic states on undriven or floating lines. Using external pullup or pulldown resistors with the SN74AVCH16T245 is explicitly discouraged in the datasheet, as it conflicts with the internal bus-hold current and may cause excessive power draw or logic instability.

What is the maximum data rate supported by the SN74AVCH16T245 under real-world conditions?

The SN74AVCH16T245 achieves up to 380 Mbps in 1.8 V ↔ 3.3 V level-shifting mode (tPLH/tPHL ≤ 3.2 ns typical). At lower voltage combinations - such as 1.2 V ↔ 1.2 V - the maximum usable rate drops to 100 Mbps due to increased propagation delay (6.4 ns typical). Real-world throughput depends on load capacitance, PCB routing, and supply stability, but the device is characterized and guaranteed across all supported VCC pairs.

Can the SN74AVCH16T245 be used in automotive applications?

The SN74AVCH16T245 is not AEC-Q200 qualified, but its electrical specifications - including 8 kV HBM ESD rating, >100 mA latch-up immunity, –40°C to +85°C operating range, and robust Ioff/VCC isolation - align with many automotive infotainment and body electronics requirements. For safety-critical or under-hood use, TI recommends AEC-Q100-qualified alternatives; however, the SN74AVCH16T245 is widely deployed in dashboard displays and gateway modules where qualification is customer-defined.