NXP Semiconductors 74ALVC573BQ,115

Overview

74ALVC573BQ,115 from Nexperia is an octal D-type transparent latch with 3-state outputs, designed for bus interface and data buffering in low-voltage digital systems. It features independent latch enable (LE, active HIGH) and output enable (OE, active LOW), operates from 1.65 V to 3.6 V, supports -40 °C to +125 °C, and includes IOFF partial power-down protection. Used in microcontroller peripheral interfacing where bidirectional bus isolation and level translation are required.

For engineers reviewing the 74ALVC573BQ,115 datasheet, 74ALVC573BQ,115 pinout, 74ALVC573BQ,115 application, or 74ALVC573BQ,115 equivalent, key selection criteria include latch transparency timing (Dn→Qn tpd ≤ 3.8 ns at 3.3 V), IOFF-enabled power-down safety, Schmitt-trigger input tolerance for slow edges, and DHVQFN20 thermal performance in space-constrained PCB layouts.

Technical Context

This device implements eight independent D-type latches with shared LE and OE controls, enabling simultaneous capture and 3-state output control of 8-bit parallel data. Its CMOS architecture ensures low static current (ICC ≤ 80 μA at 3.6 V) and high noise immunity via Schmitt-trigger inputs.

The IOFF circuit actively disables outputs when VCC = 0 V, blocking backflow current during partial power-down-critical for hot-swap and multi-rail system designs. All timing parameters (tsu = 0.8 ns, th = 0.7 ns, tW = 3.3 ns) are guaranteed across the full -40 °C to +125 °C industrial temperature range.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad; optimized for thermal dissipation and high-density routing in compact embedded systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transparent latch applications.

Compared with SN74LVC573APWR and 74LVCH16373ADGG, the 74ALVC573BQ,115 uniquely combines DHVQFN20 miniaturization, guaranteed IOFF protection, and sub-4 ns timing across the full industrial temperature range-making it optimal for space- and safety-critical embedded control nodes.

Availability

74ALVC573BQ,115 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, and telecom infrastructure equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVC573BQ,115 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

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for automotive, industrial, and consumer markets.

The 74ALVC family targets low-voltage, high-speed digital interfacing applications-designed specifically for energy-efficient systems operating at 1.65–3.6 V with stringent thermal and timing constraints.

FAQ

What is the function of the thermal pad on the DHVQFN20 package?

The exposed thermal pad (terminal 1 index area) on the 74ALVC573BQ,115 has no electrical function and must remain electrically floating unless connected to GND for thermal enhancement. Soldering it to a GND plane improves thermal resistance by up to 35%, enabling sustained operation at 125 °C ambient without derating. Do not connect it to VCC or signal nets.

Can OE and LE be tied together for simplified control?

No-OE and LE serve distinct functions and must be controlled separately. Tying them together forces simultaneous output disable and latch capture, violating the functional table: when OE = LOW and LE = LOW, outputs remain latched but cannot be read; when OE = HIGH and LE = HIGH, outputs enter high-impedance while remaining transparent, causing undefined bus states. Independent control is mandatory for correct bus arbitration.

Does the 74ALVC573BQ,115 support hot insertion?

Yes-its IOFF circuitry actively disables outputs when VCC = 0 V, preventing back-current flow during live insertion into powered backplanes. This capability is validated per JESD78 Class II.A latch-up testing (>250 mA) and HBM ESD rating (>2000 V), making it suitable for modular telecom and test equipment where field-replaceable cards are used.

How does Schmitt-trigger input action improve system reliability?

Schmitt-trigger inputs provide ~0.35 V hysteresis at 3.3 V supply, eliminating metastability and false triggering caused by slow-rising or noisy control signals (e.g., mechanical switch debouncing, long PCB traces). This ensures deterministic LE and OE transitions even with rise/fall times up to 10 ns/V, reducing firmware-level polling overhead and improving real-time response in safety-critical control loops.