Texas Instruments SN74ALVTHR16245GR

Overview

SN74ALVTHR16245GR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for 2.5-V/3.3-V V_CC operation and mixed-mode 5-V interface compatibility. It features ±12 mA drive strength at 3.3 V, integrated 30-Ω output series resistors, bus-hold circuitry on all data inputs, and I_off/power-up 3-state support for hot insertion. It is used in high-speed backplane and board-level bidirectional data bus isolation.

For engineers reviewing the SN74ALVTHR16245GR datasheet, SN74ALVTHR16245GR pinout, SN74ALVTHR16245GR application, or SN74ALVTHR16245GR equivalent, this page delivers verified technical context, real-world timing and drive specifications, TSSOP-48 package layout guidance, hot-swap design considerations, and validated alternative options for industrial and telecom bus interface designs.

Technical Context

This device implements two independent 8-bit bidirectional transceivers in a single IC, each controlled by dedicated DIR (direction) and OE (output enable) signals. Data flow is strictly noninverting: A→B when DIR = HIGH, B→A when DIR = LOW, and high-impedance isolation when OE = HIGH.

It uses Advanced BiCMOS Technology (ABT) to achieve low static power (≤5 mA ICC at 3.3 V, outputs active), sub-4 ns propagation delay (t_PHL/t_PLH ≤ 3.9 ns @ 3.3 V, CL = 50 pF), and robust noise immunity via distributed V_CC/GND pins and flow-through pin architecture.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package: 12.6 mm × 6.2 mm × 1.2 mm max height, 0.5-mm lead pitch, gull-wing leads, RoHS-compliant finish. Pin 1 marked with dot; pin numbering follows standard counter-clockwise top-view convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus transceiver applications.

Compared with SN74AVC16T245DGGR and SN74LVC16245ADGGR, the SN74ALVTHR16245GR uniquely combines 2.5-V/3.3-V dual-supply operation, integrated bus-hold, I_off-enabled hot insertion, and 5-V tolerant inputs-making it the only option among the three qualified for legacy-compatible, field-serviceable backplane designs.

Availability

SN74ALVTHR16245GR is available at Aetrix Electronics and suitable for telecom line card development, industrial PLC backplane integration, automated test equipment I/O modules, and medical imaging data acquisition boards requiring stable component supply and long-term obsolescence management.

Supply support for SN74ALVTHR16245GR 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 logic solutions, with over 50 years of innovation in high-reliability interface and power management ICs.

The ALVTHR family was engineered specifically for robust, mixed-voltage bus bridging in mission-critical infrastructure-emphasizing hot-swap resilience, ESD hardening, and deterministic timing in telecom, industrial automation, and test instrumentation.

FAQ

What voltage levels can SN74ALVTHR16245GR tolerate on its I/O pins when V_CC = 3.3 V?

The SN74ALVTHR16245GR accepts input voltages from 0 V to 5.5 V on all A and B port pins-even when V_CC is 3.3 V-enabling direct interfacing with 5-V TTL logic without external level shifters. This 5-V tolerance is explicitly specified in the recommended operating conditions table for VI (input voltage) and confirmed in absolute maximum ratings.

Does SN74ALVTHR16245GR support hot insertion, and how is it implemented?

Yes, SN74ALVTHR16245GR supports hot insertion via two complementary features: I_off circuitry disables outputs when V_CC = 0 V (leakage ≤±100 µA), preventing damaging back-current; and power-up 3-state holds all outputs in high-impedance until V_CC exceeds 1.2 V. These functions are validated per JESD78 Class II latch-up testing and documented in the functional description section.

Can SN74ALVTHR16245GR operate at 2.5 V, and what are the key performance trade-offs versus 3.3 V operation?

Yes, SN74ALVTHR16245GR is fully specified for 2.5 V ±0.2 V operation. At 2.5 V, drive strength reduces to ±6 mA (vs. ±12 mA at 3.3 V), propagation delay increases slightly (max t_PHL/t_PLH = 4.3 ns vs. 3.9 ns), and ICC drops to ≤4.5 mA. All timing, voltage threshold, and bus-hold parameters remain guaranteed across the full 2.3–2.7 V range.

How does the bus-hold feature on SN74ALVTHR16245GR eliminate the need for external resistors?

The SN74ALVTHR16245GR integrates active bus-hold circuitry on every A and B port input, providing ≥75 µA sink (IBHL) and ≥75 µA source (IBHH) current at 3 V to maintain valid logic states on floating inputs. TI explicitly states "use of pullup or pulldown resistors with the bus-hold circuitry is not recommended", as external resistors would conflict with internal biasing and degrade noise margin.

What is the thermal performance of SN74ALVTHR16245GR in its TSSOP-48 (DGG) package?

The SN74ALVTHR16245GR in TSSOP-48 has a junction-to-ambient thermal resistance (θ_JA) of 70°C/W, measured per JESD51-7 on a standard 4-layer JEDEC test board. This allows continuous operation up to 85°C ambient when dissipating ≤70 mW (e.g., at ICC ≤5 mA and I_O = 0), with derating required above that power level per the thermal characteristics graph in the datasheet.