Texas Instruments SN74AVCH16T245GR

Overview

SN74AVCH16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting, tri-state outputs, and VCC isolation. It supports bidirectional voltage translation between 1.2 V–3.6 V rails (VCCA and VCCB), delivers up to 380 Mbps (1.8 V → 3.3 V), features Ioff for partial-power-down operation, and includes bus-hold on all data inputs. It enables reliable interconnection between mixed-voltage subsystems in industrial control backplanes.

For engineers reviewing the SN74AVCH16T245 datasheet, SN74AVCH16T245 pinout, SN74AVCH16T245 application, or SN74AVCH16T245 equivalent, key selection criteria include dual-rail supply flexibility (1.2 V–3.6 V per port), 4.6 V I/O tolerance, VCC isolation behavior, bus-hold circuitry eliminating external resistors, and guaranteed switching performance across 16 bidirectional channels.

Technical Context

The SN74AVCH16T245 implements two independent 8-bit transceiver blocks (1A↔1B and 2A↔2B), each controlled by dedicated DIR and OE signals referenced to VCCA. Its fully configurable dual-rail architecture allows asymmetric operation - e.g., VCCA = 1.8 V and VCCB = 3.3 V - with input thresholds tied to the respective supply rail.

VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND; Ioff limits current backflow during power sequencing; and active bus-hold maintains valid logic states on undriven A/B inputs without external components. All I/Os tolerate up to 4.6 V regardless of supply voltage.

Key Specifications

Pinout & Package

SN74AVCH16T245 is packaged in a 48-pin TSSOP (body size 12.50 mm × 6.10 mm) with exposed pad thermal enhancement. Pin numbering follows standard JEDEC TSSOP layout (1–48, top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16T245DGGR and TXB0108PWR, the SN74AVCH16T245 uniquely combines 16-bit dual-rail translation, VCC isolation, integrated bus-hold, and 380 Mbps performance - making it the only option for high-reliability, mixed-voltage industrial backplane designs requiring deterministic direction control and fault resilience.

Availability

SN74AVCH16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, enterprise server DIMMs, telecom line cards, and automotive ADAS domain controllers requiring stable component supply and long-term lifecycle support.

Supply support for SN74AVCH16T245 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 decades of experience in high-reliability interface solutions.

The SN74AVCH16T245 belongs to TI's AVC family of advanced voltage-translating transceivers, designed specifically for robust, low-power, mixed-voltage system interconnect in industrial, telecom, and computing infrastructure.

FAQ

What voltage ranges does the SN74AVCH16T245 support on its A and B ports?

The SN74AVCH16T245 supports independent supply voltages from 1.2 V to 3.6 V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V logic domains. The device remains fully functional even with asymmetric rails - for example, VCCA = 1.8 V and VCCB = 3.3 V - and guarantees timing and drive strength across the full range.

Does the SN74AVCH16T245 require external pullup or pulldown resistors?

No, the SN74AVCH16T245 includes active bus-hold circuitry on all 32 data I/Os (1A1–1A8, 1B1–1B8, 2A1–2A8, 2B1–2B8), which maintains undriven inputs at valid logic states without external components. TI explicitly advises against using pull resistors with this feature, as they interfere with bus-hold operation and increase power consumption.

How does the VCC isolation feature work in the SN74AVCH16T245?

The VCC isolation feature in the SN74AVCH16T245 forces both A and B ports into high-impedance state whenever either VCCA or VCCB drops to GND - even if the other supply remains active. This prevents false logic levels or current injection between powered and unpowered subsystems during power-up, power-down, or fault conditions, enhancing system-level robustness in modular hardware.

What is the maximum data rate supported by the SN74AVCH16T245?

The SN74AVCH16T245 supports up to 380 Mbps when translating from 1.8 V to 3.3 V. Performance varies with voltage combinations: 200 Mbps for <1.8 V → 3.3 V or level-shifting to 2.5 V/1.8 V, 150 Mbps to 1.5 V, and 100 Mbps to 1.2 V. These rates are validated across temperature (–40°C to 85°C) and load (15 pF), with propagation delays as low as 2.7 ns (A→B, VCCA = 3.3 V, VCCB = 3.3 V).

Can the SN74AVCH16T245 be used in partial-power-down applications?

Yes - the SN74AVCH16T245 incorporates Ioff circuitry that disables outputs and limits leakage to ±5 μA max when either VCCA or VCCB is at 0 V. This prevents damaging current backflow through the device during partial power-down, hot-swap events, or standby modes, making it suitable for energy-efficient and modular system architectures requiring dynamic power gating.