Texas Instruments SN74AVC8T245PWR

Overview

SN74AVC8T245PWR from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.2 V–3.6 V domains (e.g., 1.8 V ↔ 3.3 V), with 3-state outputs, VCC isolation, Ioff partial-power-down support, and up to 320 Mbps data rate at ≥1.8 V supplies - used in FPGA-to-ASIC interconnects, memory subsystems, and mixed-voltage SoC interfaces.

For engineers reviewing the SN74AVC8T245PWR datasheet, SN74AVC8T245PWR pinout, SN74AVC8T245PWR application, or SN74AVC8T245PWR equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.2–3.6 V), 4.6-V I/O tolerance, latch-up immunity (>100 mA), ESD robustness (8 kV HBM), and direction-controlled asynchronous data flow between heterogeneous voltage domains.

Technical Context

The SN74AVC8T245PWR implements a noninverting, bidirectional transceiver architecture where DIR selects A→B (high) or B→A (low) data flow, while OE enables/disables all outputs into high-impedance state. Control inputs (DIR, OE) are referenced solely to VCCA, decoupling control logic from B-side supply variations.

Its dual-rail design supports independent operation of A-port (VCCA-referenced) and B-port (VCCB-referenced) across 1.2 V–3.6 V, enabling universal low-voltage translation among 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V nodes. VCC isolation ensures both ports enter high-Z when either VCCA or VCCB = GND, preventing bus contention during power sequencing.

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.8 mm × 6.4 mm body, 0.65 mm pitch; thermally enhanced for high-density PCB layouts with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC8T245PWR and TXB0108PWR, the SN74AVC8T245PWR uniquely delivers deterministic bidirectional translation across independent 1.2–3.6 V rails at 320 Mbps - making it the only option among the three qualified for high-bandwidth, mixed-voltage parallel bus bridging without external components or timing compromises.

Availability

SN74AVC8T245PWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, enterprise SSD controllers, and FPGA-to-memory subsystems requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for SN74AVC8T245PWR 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 high-reliability interface ICs.

The SN74AVC8T245PWR belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in space- and power-constrained systems operating across heterogeneous voltage domains.

FAQ

What voltage ranges can SN74AVC8T245PWR translate between?

The SN74AVC8T245PWR supports bidirectional translation between any two voltage domains from 1.2 V to 3.6 V - including 1.2 V ↔ 1.8 V, 1.5 V ↔ 2.5 V, 1.8 V ↔ 3.3 V, and asymmetric combinations like 1.2 V A-port ↔ 3.3 V B-port. Both VCCA and VCCB must be within 1.2 V–3.6 V, and the device remains functional down to 1.2 V on either rail.

How does SN74AVC8T245PWR handle power sequencing when VCCA and VCCB ramp at different rates?

The SN74AVC8T245PWR incorporates VCC isolation: if either VCCA or VCCB is at GND while the other is powered, all I/Os automatically enter high-impedance state. This prevents bus contention and backdrive damage during staggered power-up/down sequences - a critical feature for complex multi-rail systems where SN74AVC8T245PWR is deployed.

Can SN74AVC8T245PWR be used in partial-power-down mode, and how is it implemented?

Yes - SN74AVC8T245PWR supports partial-power-down via its Ioff circuitry. When either VCCA or VCCB is at 0 V, the Ioff feature disables output drivers and limits I/O leakage to ±5 μA maximum, preventing damaging current backflow. This allows safe integration into power-gated subsystems without external isolation components.

What is the maximum data rate supported by SN74AVC8T245PWR, and under what conditions?

The SN74AVC8T245PWR achieves up to 320 Mbps when both VCCA ≥ 1.8 V and VCCB ≥ 1.8 V. At lower supplies (e.g., VCCA < 1.8 V or VCCB < 1.8 V), the maximum rated speed drops to 170 Mbps. These values are validated across –40°C to +125°C and reflect guaranteed timing margins per TI's SCES517K datasheet.

Is SN74AVC8T245PWR compatible with 5-V tolerant systems?

While SN74AVC8T245PWR is not 5-V tolerant on its power supplies (absolute max VCCA/VCCB = 4.6 V), its I/O pins are rated for 4.6 V regardless of supply voltage - enabling safe interface with 5-V logic outputs via series resistors or clamping diodes. Direct 5-V connection is not permitted; SN74AVC8T245PWR must be used within its 1.2–3.6 V supply and 4.6 V I/O voltage limits.