Texas Instruments SN74AVC8T245PWRG4

Overview

SN74AVC8T245PWRG4 from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2 V–3.6 V domains, featuring configurable VCCA/VCCB rails, 3-state outputs, Ioff partial-power-down support, and 320 Mbps max data rate at ≥1.8 V supplies - deployed in mixed-voltage FPGA-to-ASIC interconnects.

For engineers reviewing the SN74AVC8T245PWRG4 datasheet, SN74AVC8T245PWRG4 pinout, SN74AVC8T245PWRG4 application, or SN74AVC8T245PWRG4 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 TSSOP-24 package thermal performance (RθJA = 93.1°C/W).

Technical Context

The SN74AVC8T245PWRG4 implements a noninverting, direction-controlled transceiver architecture with independent A-port (VCCA-referenced) and B-port (VCCB-referenced) power domains. Control inputs DIR and OE are strictly referenced to VCCA, ensuring deterministic logic thresholds during asymmetric rail operation.

Its Ioff circuitry disables all I/Os when either VCCA or VCCB is at GND, preventing backflow current; VCC isolation forces both ports into high-impedance state under single-rail power loss. Propagation delay varies with supply pairing - e.g., tPLH/tPHL = 2.5 ns (A→B) at VCCA = VCCB = 1.8 V, dropping to 2.5 ns (B→A) at same conditions, while OE-to-output disable/enable times range 3.1–5.3 ns depending on rail combination.

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.8 mm × 6.4 mm footprint, 0.65-mm lead pitch, exposed thermal pad not present - optimized for automated assembly and moderate-power dissipation (RθJA = 93.1°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH8T245PW and TXB0108PWR, the SN74AVC8T245PWRG4 delivers superior timing control via explicit DIR, higher speed (320 vs 100 Mbps), and failsafe VCC isolation - making it optimal for deterministic, high-reliability mixed-voltage bus bridging.

Availability

SN74AVC8T245PWRG4 is available at Aetrix Electronics and suitable for FPGA-to-ASIC interconnects, industrial sensor hubs, and automotive ADAS camera links requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74AVC8T245PWRG4 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 over 90 years of innovation in high-reliability components.

The SN74AVC8T245PWRG4 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in space-constrained, multi-rail systems such as portable computing and automotive infotainment.

FAQ

What is the minimum operating voltage for SN74AVC8T245PWRG4 on each supply rail?

The SN74AVC8T245PWRG4 operates with VCCA and VCCB independently set from 1.2 V to 3.6 V. Both rails may be as low as 1.2 V simultaneously, and the device remains fully functional - including 4.6-V I/O tolerance and 320-Mbps capability when both rails reach ≥1.8 V. This enables compatibility with next-generation 1.2-V logic families while maintaining backward interoperability.

How does SN74AVC8T245PWRG4 handle power sequencing when VCCA and VCCB ramp at different rates?

The SN74AVC8T245PWRG4 incorporates VCC isolation: if either VCCA or VCCB is at GND while the other is powered, all I/Os enter high-impedance state automatically. This prevents bus contention during asymmetric power-up/down. OE should be tied to VCCA via pull-up to ensure controlled 3-state entry during VCCA ramp - no external sequencing circuitry is required for safe operation.

Can SN74AVC8T245PWRG4 translate between 1.2-V and 3.3-V logic without external components?

Yes. The SN74AVC8T245PWRG4 natively supports 1.2-V ↔ 3.3-V translation: configure VCCA = 1.2 V (for A-port interface) and VCCB = 3.3 V (for B-port interface). Its 4.6-V I/O tolerance protects B-port pins from overvoltage, and input thresholds scale with VCCA - eliminating level-shift resistors, capacitors, or supplemental bias networks.

What is the maximum data rate supported by SN74AVC8T245PWRG4 under real-world conditions?

The SN74AVC8T245PWRG4 achieves 320 Mbps when both VCCA ≥ 1.8 V and VCCB ≥ 1.8 V, verified across temperature (–40°C to +125°C) and load (15 pF). At lower voltages (e.g., VCCA = VCCB = 1.2 V), max rate drops to 170 Mbps. Real-world throughput depends on trace impedance, termination, and noise margin - design for ≤250 Mbps with 10% timing margin in production layouts.

Does SN74AVC8T245PWRG4 support hot-swap or partial-power-down modes?

Yes. The SN74AVC8T245PWRG4 features Ioff circuitry that disables all I/Os when either VCCA or VCCB is at GND, limiting leakage to ±5 μA. This enables safe hot-insertion of daughterboards and power-gating of subsystems without damaging current flow - critical for modular industrial controllers and field-upgradeable telecom equipment.