Texas Instruments 74AVCH4T245RSVRG4

Overview

74AVCH4T245RSVRG4 from Texas Instruments is a 4-bit dual-supply noninverting bus transceiver with configurable level-shifting between 1.2V and 3.6V rails, 4.6V I/O tolerance, bus-hold circuitry, and 3-state outputs. It enables bidirectional voltage translation between mismatched logic domains (e.g., 1.2V ↔ 3.3V) in low-power portable electronics and industrial control interfaces.

For engineers reviewing the 74AVCH4T245RSVRG4 datasheet, 74AVCH4T245RSVRG4 pinout, 74AVCH4T245RSVRG4 application, or 74AVCH4T245RSVRG4 equivalent, this device supports up to 380Mbps data rate (1.8V→3.3V), features Ioff for partial power-down, VCC isolation, and operates across –40°C to +85°C.

Technical Context

The 74AVCH4T245RSVRG4 implements a fully configurable dual-rail architecture: A-port pins and control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced to VCCA (1.2V–3.6V), while B-port pins track VCCB (1.2V–3.6V). Direction control is asynchronous per channel pair, with independent OE enable for each 2-bit section.

Its bus-hold circuitry actively sustains undriven inputs at valid logic levels without external resistors, and the Ioff feature disables outputs during power-down to prevent backflow current. VCC isolation ensures both ports enter high-impedance state if either VCCA or VCCB falls below ~0.4V.

Key Specifications

Pinout & Package

74AVCH4T245RSVRG4 is packaged in a 16-pin UQFN (RSV) measuring 2.6mm × 1.8mm with 0.4mm pitch, optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4T245RSMR and TXS0104ERUKR, the 74AVCH4T245RSVRG4 uniquely combines dual independent supplies, 4.6V I/O tolerance, and hardware-enforced isolation-making it the only choice for mixed-rail systems requiring guaranteed fault containment during power sequencing or brown-out.

Availability

74AVCH4T245RSVRG4 is available at Aetrix Electronics and suitable for mobile baseband interfaces, industrial PLC I/O modules, enterprise SSD controller bridges, and automotive infotainment SoC interfaces requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74AVCH4T245RSVRG4 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 and embedded processing solutions, with decades of expertise in logic, interface, and power management ICs.

The SN74AVCH4T245 belongs to TI's AVC family of advanced voltage-controlled translators, designed specifically for low-voltage, high-speed bidirectional communication between heterogeneous logic domains in portable, industrial, and communications equipment.

FAQ

What voltage ranges does the 74AVCH4T245RSVRG4 support on its A and B ports?

The 74AVCH4T245RSVRG4 supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of standard low-voltage nodes-including 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V-without external components. The device remains fully functional even when VCCA and VCCB differ.

Does the 74AVCH4T245RSVRG4 require external pull-up or pull-down resistors on its data lines?

No. The 74AVCH4T245RSVRG4 integrates active bus-hold circuitry on all A- and B-port data inputs, which maintains undriven or floating lines at valid logic states. Using external pull-up or pull-down resistors is explicitly discouraged in the datasheet, as they conflict with bus-hold operation and may increase power consumption or cause signal integrity issues.

How does the Ioff feature function in the 74AVCH4T245RSVRG4 during partial power-down?

The Ioff feature in the 74AVCH4T245RSVRG4 disables output drivers when either VCCA or VCCB is at 0V, limiting leakage current to ±0.1µA maximum. This prevents damaging backflow current from a powered rail into an unpowered one-critical for hot-swap, battery-backed subsystems, and dynamic power gating. The 74AVCH4T245RSVRG4 maintains this protection across –40°C to +85°C.

Can the 74AVCH4T245RSVRG4 translate signals between a 1.2V microcontroller and a 5V peripheral?

No-the 74AVCH4T245RSVRG4 is rated for 4.6V absolute maximum I/O voltage, not 5V. While its I/Os tolerate up to 4.6V regardless of VCCA/VCCB, direct connection to a true 5V peripheral exceeds its absolute maximum rating and risks permanent damage. For 1.2V↔5V translation, a purpose-built 5V-tolerant level shifter (e.g., TXB0304) must be used instead of the 74AVCH4T245RSVRG4.

What is the maximum data rate supported by the 74AVCH4T245RSVRG4, and under what conditions?

The 74AVCH4T245RSVRG4 supports up to 380Mbps, but only in the specific 1.8V-to-3.3V translation direction. Other combinations yield lower rates: 200Mbps for <1.8V→3.3V or →2.5V/1.8V, 150Mbps for →1.5V, and 100Mbps for →1.2V. These values are measured under defined load and transition conditions per the official TI datasheet SCES577F.