Texas Instruments SN74AVCH4T245DGVR

Overview

SN74AVCH4T245DGVR from Texas Instruments is a 4-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V–3.6V domains, with configurable direction control (DIR), 3-state outputs (OE), and I/Os tolerant to 4.6V. It supports up to 380Mbps data rate (1.8V→3.3V), features bus-hold on all data inputs, and delivers Ioff protection for partial power-down operation in mixed-voltage system interconnects.

For engineers reviewing the SN74AVCH4T245DGVR datasheet, SN74AVCH4T245DGVR pinout, SN74AVCH4T245DGVR application, or SN74AVCH4T245DGVR equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.2V–3.6V), 4.6V I/O tolerance, guaranteed 3.6ns max propagation delay at 3.3V, bus-hold elimination of external resistors, and TVSOP-16 (DGV) package compatibility with high-density PCB layouts.

Technical Context

The SN74AVCH4T245DGVR implements a fully asynchronous, dual-rail architecture where A-port I/Os and control pins (1DIR/2DIR/1OE/2OE) reference VCCA, while B-port I/Os reference VCCB - both independently adjustable from 1.2V to 3.6V. Directional data flow (A↔B) is controlled per 2-bit channel via DIR inputs, with OE enabling/disabling outputs into high-impedance state.

VCC isolation ensures both ports enter high-Z if either VCCA or VCCB falls below ~0.4V, preventing false logic injection. Bus-hold circuitry actively sustains undriven inputs at valid logic levels without external components, and Ioff limits reverse current during partial power-down, meeting JESD78 Class II latch-up immunity (>100mA).

Key Specifications

Pinout & Package

SN74AVCH4T245DGVR is packaged in a 16-pin TVSOP (Thin Very Small Outline Package) with 0.65mm pitch, measuring 3.6mm × 6.4mm - optimized for space-constrained applications requiring fine-pitch surface-mount assembly and thermal performance (RθJA = 126°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4T245RGYR, SN74AVCH4T245DGVR offers superior ESD robustness (8kV HBM vs 4kV) and integrated bus-hold, while TXS0104EPWR trades DIR control and drive strength for protocol-aware automation - making SN74AVCH4T245DGVR optimal for deterministic, high-drive, mixed-voltage parallel bus bridging.

Availability

SN74AVCH4T245DGVR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive infotainment gateways, and enterprise SSD controller interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74AVCH4T245DGVR 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 SN74AVCH4T245DGVR belongs to TI's AVC logic family - engineered specifically for low-voltage, high-speed bidirectional level translation in mixed-supply digital systems where power efficiency, signal integrity, and design simplicity are critical.

FAQ

What voltage ranges can SN74AVCH4T245DGVR translate between?

SN74AVCH4T245DGVR supports bidirectional translation between any two supply domains from 1.2V to 3.6V inclusive - including 1.2V↔1.5V, 1.2V↔1.8V, 1.5V↔2.5V, 1.8V↔3.3V, and all other combinations within that range. Both VCCA and VCCB must be within 1.2V–3.6V, and the device remains fully operational even when one rail is at the minimum 1.2V.

Does SN74AVCH4T245DGVR require external pull-up or pull-down resistors on its data lines?

No. SN74AVCH4T245DGVR integrates active bus-hold circuitry on all eight data I/Os (1A1–2A2, 1B1–2B2), which maintains undriven inputs at valid logic states without external components. Using pull-up or pull-down resistors with SN74AVCH4T245DGVR is explicitly discouraged in the datasheet, as it may interfere with bus-hold functionality and increase power consumption.

How does SN74AVCH4T245DGVR behave during power-up or partial power-down?

SN74AVCH4T245DGVR features VCC isolation and Ioff protection. If either VCCA or VCCB falls below ~0.4V, both A and B ports automatically enter high-impedance state. Additionally, Ioff circuitry disables output drivers when supplies are off, limiting reverse current to ±0.1µA max - ensuring safe operation during hot-swap, staggered power sequencing, or subsystem power gating.

What is the maximum data rate supported by SN74AVCH4T245DGVR?

SN74AVCH4T245DGVR supports up to 380Mbps when translating from 1.8V to 3.3V. Performance varies with voltage combination: 200Mbps for <1.8V→3.3V or translation to 2.5V/1.8V, 150Mbps to 1.5V, and 100Mbps to 1.2V. These rates are validated under specified load and temperature conditions per the official SCES577F datasheet.

Can SN74AVCH4T245DGVR be used in place of SN74LVC4T245 in existing designs?

SN74AVCH4T245DGVR is pin-compatible with SN74LVC4T245 in the same TVSOP-16 (DGV) package and shares identical pinout and logic behavior. However, SN74AVCH4T245DGVR adds bus-hold, tighter Ioff specs, and higher ESD ratings - making it a drop-in upgrade in most cases. Always verify timing margins and bus-hold interaction with existing firmware initialization sequences before substitution.