Texas Instruments SN74AVC8T245PWE4

Overview

SN74AVC8T245PWE4 from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2 V–3.6 V domains. It features independent VCCA (controls DIR/OE and A-port) and VCCB (powers B-port), 4.6-V I/O tolerance, 320 Mbps max data rate at ≥1.8 V supplies, and Ioff/partial-power-down support. It is used in mixed-voltage system interconnects such as FPGA-to-ASIC or SoC-to-peripheral interfaces.

For engineers reviewing the SN74AVC8T245PWE4 datasheet, SN74AVC8T245PWE4 pinout, SN74AVC8T245PWE4 application, or SN74AVC8T245PWE4 equivalent, key selection criteria include dual-rail supply flexibility (1.2–3.6 V per rail), direction-controlled bidirectional data flow, VCC isolation behavior, 3-state output enable timing, and compatibility with 1.2/1.5/1.8/2.5/3.3-V node translation.

Technical Context

The SN74AVC8T245PWE4 implements asynchronous, noninverting bidirectional data transfer controlled by DIR (referenced to VCCA) and OE (also VCCA-referenced). Its dual-rail architecture decouples A-port (VCCA-tracked) and B-port (VCCB-tracked) logic thresholds, enabling true level-shifting without external biasing. The device supports simultaneous operation across mismatched supply rails - e.g., VCCA = 1.8 V and VCCB = 3.3 V - with guaranteed DC and AC performance per JEDEC JESD8-12 and JESD8-13 standards.

VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND, while Ioff limits leakage to ±5 µA over –40°C to +125°C. Switching characteristics are specified across five VCCA/VCCB combinations, with propagation delays as low as 2.3 ns (A→B, VCCA = VCCB = 3.3 V) and enable/disable times down to 1.7 ns (OE→A, VCCA = VCCB = 3.3 V).

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.8 mm × 6.4 mm footprint, 0.65 mm pitch, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC8T245PW and TXB0108PWR, the SN74AVC8T245PWE4 uniquely delivers configurable dual-rail translation with VCC isolation and 320 Mbps throughput - making it the only option among the three qualified for mixed-voltage, high-speed, and power-sequencing-sensitive designs.

Availability

SN74AVC8T245PWE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, enterprise SSD controllers, medical imaging FPGA links, and enterprise server management interfaces requiring stable component supply and long-term lifecycle support.

Supply support for SN74AVC8T245PWE4 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 SN74AVC8T245PWE4 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in power-constrained, mixed-supply systems - targeting next-generation portable, automotive, and industrial edge devices.

FAQ

What voltage ranges can SN74AVC8T245PWE4 translate between?

The SN74AVC8T245PWE4 supports bidirectional translation between any two logic domains where VCCA and VCCB are independently set from 1.2 V to 3.6 V. This covers common combinations including 1.2 V ↔ 1.8 V, 1.5 V ↔ 3.3 V, and 1.8 V ↔ 2.5 V. Each I/O port tolerates up to 4.6 V regardless of its supply rail, allowing safe interfacing with higher-voltage buses.

How does SN74AVC8T245PWE4 behave during power sequencing?

The SN74AVC8T245PWE4 implements VCC isolation: if either VCCA or VCCB is at GND while the other is powered, both A and B ports automatically enter high-impedance. This prevents contention and backfeed during asymmetric power-up/down. Additionally, Ioff limits leakage to ±5 µA, ensuring safe partial-power-down operation in systems with staggered rail activation.

What is the maximum data rate supported by SN74AVC8T245PWE4?

The SN74AVC8T245PWE4 achieves up to 320 Mbps when both VCCA and VCCB are ≥ 1.8 V. At lower supplies (e.g., VCCA < 1.8 V or VCCB < 1.8 V), the maximum rated data rate drops to 170 Mbps. These values are validated across –40°C to +125°C and reflect guaranteed switching performance under worst-case process/voltage/temperature corners.

Does SN74AVC8T245PWE4 require external pull-up resistors on control pins?

Yes - OE should be tied to VCCA through a pull-up resistor during power-up to ensure outputs remain in high-impedance until firmware asserts valid control signals. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends ≥10 kΩ for typical microcontroller GPIOs. DIR has no internal pull-up and must be actively driven.

Is SN74AVC8T245PWE4 pin-compatible with other 24-pin TSSOP transceivers?

No - SN74AVC8T245PWE4 uses a unique pinout optimized for dual-rail operation: VCCA is on Pin 1, DIR on Pin 2, A1–A8 on Pins 3–10, GND on Pins 11–13, B1–B8 on Pins 14–21, OE on Pin 22, and VCCB on Pins 23–24. It is not pin-compatible with SN74LVC8T245PW or SN74LVCH8T245PWR due to differing supply and control pin assignments.