Texas Instruments 74ALVTHR16245ZQLR

Overview

74ALVTHR16245ZQLR from Texas Instruments is a 16-bit dual-octal noninverting 3-state transceiver designed for 2.5-V/3.3-V V_CC operation with mixed-mode 5-V I/O tolerance, ±64 mA output drive, bus-hold circuitry, and hot-insertion support via I_off and power-up 3-state. It enables bidirectional data flow between A and B buses in high-speed backplane or memory interface applications.

For engineers reviewing the 74ALVTHR16245ZQLR datasheet, 74ALVTHR16245ZQLR pinout, 74ALVTHR16245ZQLR application, or 74ALVTHR16245ZQLR equivalent, key selection criteria include its 3.3-V supply compatibility, 5-V tolerant inputs/outputs, 3.1 ns max propagation delay (V_CC = 3.3 V), bus-hold functionality eliminating external resistors, and GQL package thermal performance (θ_JA = 42°C/W).

Technical Context

This device implements a flow-through architecture with distributed V_CC and GND pins to minimize switching noise, and integrates active bus-hold circuitry on all data inputs to maintain valid logic levels without pullup/pulldown resistors. Its ABT BiCMOS process delivers low static power dissipation while supporting TTL-level interfacing in mixed-voltage systems.

The transceiver operates in two independent 8-bit sections, each controlled by dedicated DIR and OE inputs. Direction control determines A→B or B→A data flow; OE asserts high-impedance state on both ports. I_off protection disables outputs during power-down to prevent backflow current, and power-up 3-state ensures isolation during ramp-up when V_CC < 1.2 V.

Key Specifications

Pinout & Package

VFBGA-48 (GQL) package: 6 × 5 mm body, 0.5-mm pitch, bottom-side solder balls, JEDEC MO-205 standard. Designed for high-density routing and improved thermal dissipation over leaded packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16245VR and SN74LVC16245ADGGR, the 74ALVTHR16245ZQLR provides superior thermal management in dense layouts, eliminates external bias components via bus-hold, and guarantees safe live insertion-making it the sole option meeting full industrial backplane reliability requirements.

Availability

74ALVTHR16245ZQLR is available at Aetrix Electronics and suitable for backplane routing, memory interface buffering, industrial PLC I/O expansion, and test equipment signal switching requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for 74ALVTHR16245ZQLR 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 innovation in high-speed interface ICs and industrial-grade reliability.

The ALVTH16245 product line was developed specifically for mixed-voltage system interconnect-delivering robust 5-V tolerant transceivers optimized for hot-pluggable backplanes, memory subsystems, and programmable logic interfaces where signal integrity and power sequencing resilience are critical.

FAQ

What is the maximum operating temperature range for the 74ALVTHR16245ZQLR?

The 74ALVTHR16245ZQLR is rated for operation from −40°C to +85°C ambient temperature. This range is confirmed in the "Recommended Operating Conditions" table of the SCES066G datasheet for the SN74ALVTH16245 family, which applies directly to the ZQLR variant packaged in the GQL (VFBGA-48) format. The device meets industrial-grade thermal specifications without derating.

Does the 74ALVTHR16245ZQLR support hot insertion, and how is it implemented?

Yes, the 74ALVTHR16245ZQLR supports hot insertion through two integrated features: I_off circuitry disables outputs when V_CC = 0 V to prevent backflow current, and power-up 3-state holds all outputs in high-impedance until V_CC exceeds 1.2 V. These mechanisms are explicitly documented in the device description and functional behavior sections of the SCES066G datasheet and apply identically to the ZQLR ordering variant.

Can the 74ALVTHR16245ZQLR interface directly with 5-V TTL logic while powered from 3.3 V?

Yes, the 74ALVTHR16245ZQLR accepts input voltages up to 5.5 V and drives outputs compatible with 5-V TTL thresholds while operating from a 2.3–3.6-V V_CC supply. This mixed-mode capability is specified in the "Recommended Operating Conditions" and "Electrical Characteristics" tables of SCES066G and is inherent to the ALVTH16245 family design, including the ZQLR part number.

What is the purpose of the bus-hold circuitry in the 74ALVTHR16245ZQLR, and how does it affect system design?

The bus-hold circuitry in the 74ALVTHR16245ZQLR actively maintains the last-valid logic state on all 32 data inputs (A1–A16, B1–B16) when those lines float, sinking or sourcing up to ±75 µA at V_CC = 3 V. As stated in the datasheet description, this eliminates the need for external pullup or pulldown resistors-reducing component count, board area, and potential signal integrity degradation from added capacitance or resistance.

How does the GQL (VFBGA-48) package of the 74ALVTHR16245ZQLR compare thermally to other package options in the same family?

The GQL package delivers θ_JA = 42°C/W, significantly lower than the DGG (70°C/W), DGV (58°C/W), and DL (63°C/W) variants. This 30–40% improvement in thermal resistance-documented in the "Absolute Maximum Ratings" table of SCES066G-is due to the VFBGA's copper leadframe and direct die attach, enabling higher sustained power density in compact, high-performance layouts where thermal management is critical.