Texas Instruments SN74ALVTH16245KR

Overview

SN74ALVTH16245KR from Texas Instruments is a 16-bit noninverting 3-state transceiver IC designed for mixed-voltage bus interfacing between 2.5-V/3.3-V logic and 5-V systems. It supports bidirectional data flow (A↔B), features Ioff and power-up 3-state for hot insertion, delivers ±32/64 mA drive at 3.3 V, and integrates bus-hold circuitry to eliminate external pullup/pulldown resistors. It is used in backplane and motherboard interconnects requiring level translation and bus isolation.

For engineers reviewing the SN74ALVTH16245KR datasheet, SN74ALVTH16245KR pinout, SN74ALVTH16245KR application, or SN74ALVTH16245KR equivalent, key selection criteria include its dual-octal transceiver architecture, 2.3–3.6-V VCC operation with 5-V tolerant I/O, guaranteed high-speed switching (tPHL ≤ 2.9 ns at 3.3 V), thermal performance (θJA = 58°C/W in DGV), and compliance with JESD 78 Class II latch-up immunity.

Technical Context

The SN74ALVTH16245KR implements a flow-through pinout architecture with distributed VCC/GND pins to minimize simultaneous switching noise. Its ABT (Advanced BiCMOS Technology) process enables low static power dissipation while supporting TTL-level input thresholds (VIH = 2.0 V, VIL = 0.8 V at 3.3 V) and 5-V-tolerant inputs/outputs - critical for legacy system integration.

It uses active bus-hold circuitry on all A/B data inputs (IBHL = 75 µA, IBHH = −75 µA at 3 V), eliminating floating-bus risk without external resistors. Direction control (DIR) and output-enable (OE) inputs operate independently per 8-bit section, enabling flexible half-duplex or full-duplex bus arbitration in memory-mapped I/O and peripheral expansion applications.

Key Specifications

Pinout & Package

SN74ALVTH16245KR is packaged in a 48-pin TVSOP (DGV) with 0.4-mm pitch, 7.7 mm × 4.4 mm body, and exposed pad for thermal enhancement. Pin numbering follows standard top-view orientation with DIR/OE controls on opposite ends and interleaved A/B I/O groups for optimal signal routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and SN74AVC16245DGGR, the SN74ALVTH16245KR uniquely combines 5-V I/O tolerance, integrated bus-hold, Ioff, and hot-insertion readiness - making it the only option among the three qualified for industrial backplane upgrades involving legacy 5-V subsystems.

Availability

SN74ALVTH16245KR is available at Aetrix Electronics and suitable for industrial backplane interconnects, memory expansion modules, hot-swappable peripheral cards, and legacy ISA bus adapters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ALVTH16245KR 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 decades of expertise in high-reliability interface ICs for industrial and automotive markets.

The SN74ALVTH16245KR belongs to TI's Widebus™ family of advanced transceivers engineered specifically for mixed-voltage system integration, hot-swap infrastructure, and noise-sensitive backplane applications.

FAQ

What is the maximum operating temperature range for the SN74ALVTH16245KR?

The SN74ALVTH16245KR is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range is validated across all electrical specifications including drive strength, propagation delay, and bus-hold functionality - ensuring reliability in factory automation, telecom infrastructure, and outdoor equipment deployments where thermal cycling occurs.

Does the SN74ALVTH16245KR support true 5-V logic interfacing?

Yes, the SN74ALVTH16245KR supports true 5-V interfacing: its inputs and outputs tolerate up to 5.5 V regardless of VCC (2.3–3.6 V), and its VIH/VIL thresholds (2.0 V/0.8 V at 3.3 V) match TTL logic levels. This allows direct connection to 5-V peripherals without external level-shifting circuitry - a key differentiator from LVC or AVC series transceivers.

How does the bus-hold feature of the SN74ALVTH16245KR eliminate external resistors?

The SN74ALVTH16245KR integrates active bus-hold circuitry on all 16 data I/O lines, providing 75 µA sink and −75 µA source current to maintain valid logic states on floating inputs. This replaces the need for 24 discrete pullup/pulldown resistors - reducing BOM cost, PCB area, and potential signal integrity issues caused by resistor parasitics.

Can the SN74ALVTH16245KR be used in hot-swap applications?

Yes, the SN74ALVTH16245KR is explicitly designed for hot-swap use via two mechanisms: Ioff circuitry disables outputs when VCC = 0 V to block backdrive current, and power-up 3-state forces outputs into high-impedance during power ramp-up/down. These features meet JESD78 Class II latch-up immunity (>100 mA) and are validated in TI's hot-insertion application reports.

What package type is used for the SN74ALVTH16245KR and why is it suitable for high-density layouts?

The SN74ALVTH16245KR uses a 48-pin TVSOP (DGV) package measuring 7.7 mm × 4.4 mm with 0.4-mm lead pitch. Its flow-through pinout - with DIR/OE on opposing ends and A/B I/O grouped linearly - enables straight-layer routing, minimizes vias, and reduces crosstalk. Distributed VCC/GND pins further suppress switching noise in compact, multi-layer PCBs.