Texas Instruments SN74AVCH4T245RSVR

Overview

SN74AVCH4T245RSVR from Texas Instruments is a 4-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2V–3.6V domains. It features independent VCCA and VCCB rails, 4.6V I/O tolerance, bus-hold circuitry, and Ioff partial-power-down support. Used in low-voltage interconnects between SoCs and peripherals in portable electronics.

For engineers reviewing the SN74AVCH4T245RSVR datasheet, SN74AVCH4T245RSVR pinout, SN74AVCH4T245RSVR application, or SN74AVCH4T245RSVR equivalent, key selection criteria include configurable level-shifting across 1.2V/1.5V/1.8V/2.5V/3.3V nodes, 380Mbps max data rate (1.8V→3.3V), 16-pin UQFN package (2.6mm × 1.8mm), and VCC isolation for safe power sequencing.

Technical Context

The SN74AVCH4T245RSVR implements a fully configurable dual-rail architecture where A-port I/Os and control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced to VCCA (1.2V–3.6V), while B-port I/Os track VCCB (1.2V–3.6V). Direction control is asynchronous per channel: DIR = HIGH enables A→B transmission; DIR = LOW enables B→A transmission.

Its Ioff circuitry disables outputs during partial power-down, preventing backflow current when either VCCA or VCCB is at GND. The VCC isolation feature forces both ports into high-impedance when either supply drops below ~0.4V, and active bus-hold eliminates external pull resistors on undriven data lines.

Key Specifications

Pinout & Package

SN74AVCH4T245RSVR uses a 16-pin UQFN (RSV) package measuring 2.6mm × 1.8mm with 0.4mm pitch and wettable flanks. Thermal performance includes RθJA = 146.9°C/W and RθJB = 75.6°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4T245RSMR and TXB0104RGYR, SN74AVCH4T245RSVR uniquely delivers simultaneous dual-rail configurability, 380Mbps performance, integrated bus-hold, and VCC isolation-making it the only option qualified for robust, mixed-voltage, hot-pluggable embedded interfaces.

Availability

SN74AVCH4T245RSVR is available at Aetrix Electronics and suitable for mobile baseband interfaces, industrial sensor hubs, enterprise SSD controllers, and telecom base station FPGA I/O requiring stable component supply across automotive-qualified, industrial, and consumer production programs.

Supply support for SN74AVCH4T245RSVR 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 for industrial, automotive, personal electronics, and communications markets.

The SN74AVCH4T245RSVR belongs to TI's AVC logic family, engineered specifically for low-voltage bidirectional level translation in space-constrained, multi-rail systems where power sequencing integrity and signal integrity are critical.

FAQ

What voltage ranges does the SN74AVCH4T245RSVR support on its A and B ports?

The SN74AVCH4T245RSVR supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This allows translation between any pair within that range-including 1.2V↔1.5V, 1.8V↔2.5V, and 1.8V↔3.3V-without external components. The device remains functional even when both rails operate at the minimum 1.2V.

How does the SN74AVCH4T245RSVR handle power sequencing when VCCA and VCCB ramp at different times?

The SN74AVCH4T245RSVR includes VCC isolation: if either VCCA or VCCB falls below ~0.4V, both A and B ports automatically enter high-impedance mode. This prevents false logic states or contention during asymmetric power-up/down. Additionally, Ioff blocks backflow current when one rail is unpowered, protecting connected devices.

Does the SN74AVCH4T245RSVR require external pull-up or pull-down resistors on its data lines?

No. The SN74AVCH4T245RSVR integrates active bus-hold circuitry on all A- and B-port I/Os, which maintains valid logic states on undriven or floating inputs. TI explicitly advises against using external pull resistors with this feature, as they may interfere with bus-hold operation and increase power consumption unnecessarily.

What is the maximum data rate achievable with the SN74AVCH4T245RSVR, and under what conditions?

The SN74AVCH4T245RSVR achieves up to 380Mbps when translating signals from 1.8V (VCCA) to 3.3V (VCCB). 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 reflect guaranteed AC performance under recommended operating conditions.

Can the SN74AVCH4T245RSVR be used in hot-swap applications where one supply rail may be powered down while the other remains active?

Yes. The SN74AVCH4T245RSVR supports partial-power-down operation via its Ioff feature, which disables output drivers and limits leakage to ±5µA when either VCCA or VCCB is at 0V. Combined with VCC isolation, this makes the SN74AVCH4T245RSVR suitable for hot-swap and dynamic power-gating scenarios common in modular computing and telecom infrastructure.