Texas Instruments SN74AVC16T245GQLR

Overview

SN74AVC16T245GQLR from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting, tri-state outputs, and VCCA/VCCB rails independently operable from 1.2 V to 3.6 V. It enables bidirectional voltage translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V domains, supports up to 380 Mbps (1.8V→3.3V), and features I_off, V_CC isolation, and 4.6V I/O tolerance - deployed in mixed-voltage system interconnects such as processor-to-peripheral data buses.

For engineers reviewing the SN74AVC16T245GQLR datasheet, SN74AVC16T245GQLR pinout, SN74AVC16T245GQLR application, or SN74AVC16T245GQLR equivalent, key selection criteria include dual-rail supply flexibility, direction-control timing margins, high-speed level-shifting capability across sub-1.8V nodes, and BGA MICROSTAR JUNIOR package thermal performance for space-constrained industrial and telecom PCB layouts.

Technical Context

The SN74AVC16T245GQLR implements a fully configurable dual-rail architecture where A-port I/Os track VCCA and B-port I/Os track VCCB, enabling asynchronous bidirectional translation without internal level-shifters or direction latching. Control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced solely to VCCA, decoupling control logic from B-side voltage domain.

V_CC isolation ensures both ports enter high-impedance state if either VCCA or VCCB falls to GND, while I_off circuitry actively disables output drivers during partial power-down to prevent backflow current - critical for hot-swap and dynamic rail sequencing in multi-voltage systems.

Key Specifications

Pinout & Package

The SN74AVC16T245GQLR is packaged in a 56-pin BGA MICROSTAR JUNIOR (ZQL/GQL) with nominal body size 7.00 mm × 4.50 mm and 0.5-mm pitch. This RoHS-compliant, thermally enhanced package delivers R_θJA = 64.6°C/W and supports automated optical inspection (AOI) and fine-pitch reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16T245DGGR and TXB0108PWR, the SN74AVC16T245GQLR uniquely supports true dual-rail operation down to 1.2V, delivers highest bandwidth (380Mbps), and provides deterministic direction control - making it the only option for high-speed, mixed-subvolt-level system interconnects requiring guaranteed timing and rail independence.

Availability

SN74AVC16T245GQLR is available at Aetrix Electronics and suitable for industrial gateways, telecom baseband modules, automotive ADAS sensor hubs, and enterprise storage backplanes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant BGA packaging.

Supply support for SN74AVC16T245GQLR 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 expertise in high-reliability interface ICs and power management solutions.

The SN74AVC16T245GQLR belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage, high-speed bidirectional level translation in next-generation portable, industrial, and communications equipment.

FAQ

What voltage ranges can SN74AVC16T245GQLR support on its A and B ports?

The SN74AVC16T245GQLR supports independent supply voltages from 1.2 V to 3.6 V on both VCCA and VCCB rails. This allows translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V domains - for example, 1.2V↔2.5V or 1.8V↔3.3V - with full functionality and specified timing across the entire range. The device remains operational even when VCCA and VCCB differ by up to 2.1 V.

How does the VCC isolation feature function in SN74AVC16T245GQLR?

The VCC isolation feature in SN74AVC16T245GQLR ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down or fault), both A and B ports automatically enter a high-impedance state. This prevents bus contention, false logic levels, or back-driving between powered and unpowered subsystems - a critical safeguard in multi-rail systems with independent power sequencing.

What is the maximum data rate achievable with SN74AVC16T245GQLR, and under what conditions?

The SN74AVC16T245GQLR achieves a maximum data rate of 380 Mbps when translating from 1.8 V to 3.3 V. At other combinations - such as <1.8V→3.3V, 1.8V→2.5V, or 1.5V→1.8V - the rated maximum is 200 Mbps; for 1.5V→1.5V it drops to 150 Mbps, and for 1.2V→1.2V it is 100 Mbps. These values reflect guaranteed AC performance under recommended operating conditions and load capacitance ≤15 pF.

Does SN74AVC16T245GQLR require external pull-up or pull-down resistors on DIR or OE pins?

No, the SN74AVC16T245GQLR does not require external pull-up or pull-down resistors on DIR or OE inputs. These control pins are referenced to VCCA and have defined VIH/VIL thresholds across the full 1.2V–3.6V VCCA range. However, to ensure high-impedance state during power-up/power-down, TI recommends tying OE to VCCA via a pull-up resistor (value determined by driver sink capability) - this is a design best practice, not a requirement for normal operation.

Can SN74AVC16T245GQLR safely interface with 5V logic signals?

The SN74AVC16T245GQLR I/O pins are rated for absolute maximum voltage of 4.6 V - exceeding standard 3.3V logic but falling short of 5V TTL levels. Direct connection to 5V signals risks permanent damage. For 5V interface, external passive clamping (e.g., series resistor + 3.6V TVS) or a dedicated 5V-tolerant translator like SN74AVC8T245 is required. The 4.6V rating supports robust 3.3V system interoperability including overshoot margin.