Nexperia USA Inc. 74LVC573ABQ,115

Overview

74LVC573ABQ,115 from Nexperia is an octal D-type transparent latch with 3-state outputs, latch enable (LE) and output enable (OE) control, 1.2 V to 3.6 V supply operation, 5.5 V overvoltage-tolerant inputs/outputs, and Schmitt-trigger inputs for noise immunity-used in bus interface and level translation between 3.3 V and 5 V subsystems in industrial I/O controllers.

For engineers reviewing the 74LVC573ABQ,115 datasheet, 74LVC573ABQ,115 pinout, 74LVC573ABQ,115 application, or 74LVC573ABQ,115 equivalent, this device supports partial power-down (IOFF), operates from –40 °C to +125 °C, delivers sub-8 ns propagation delay at 3.3 V, and enables bidirectional voltage translation without external biasing.

Technical Context

The 74LVC573ABQ implements eight independent D-latches with synchronous transparent mode (LE HIGH) and edge-triggered latching (LE HIGH-to-LOW transition), where data is captured one setup time before LE falls. Its dual enable architecture isolates latch state (LE) from output drive (OE), allowing stored data retention while outputs float.

Schmitt-trigger inputs ensure robust timing with slow-rising signals, and the IOFF circuit actively disables outputs when VCC = 0 V, blocking backflow current during hot-swap or partial power-down sequences-critical for mixed-voltage backplane and modular PLC designs.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal quad flat no-lead with exposed thermal pad (non-soldered or floating GND connection per datasheet).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC573APWRE4, the 74LVC573ABQ,115 offers superior thermal dissipation (12.9 mW/K derating vs. 10.0 mW/K) and smaller footprint; versus 74LVCH573AQ20,115, it avoids bus-hold-induced input loading-critical for high-frequency clock distribution paths.

Availability

74LVC573ABQ,115 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical diagnostics, and test equipment requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74LVC573ABQ,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 focused on essential efficiency technologies-including logic, discrete, and MOSFET solutions-designed for high-volume, high-reliability applications.

The 74LVC573A series belongs to Nexperia's advanced LVC logic family, engineered specifically for low-voltage, mixed-signal interfacing in space-constrained industrial and automotive control systems.

FAQ

Can the 74LVC573ABQ,115 operate with a 1.2 V supply and still tolerate 5 V inputs?

Yes. The device is fully specified at VCC = 1.2 V and maintains 5.5 V overvoltage tolerance on all inputs per datasheet Table 5 and Table 4. Input clamping diodes and oxide-thickness design prevent damage or leakage exceeding ±50 mA, even when VCC is at minimum rating.

What is the maximum output drive strength at 3.3 V supply?

At VCC = 3.3 V, the 74LVC573ABQ,115 sinks 24 mA with VOL ≤ 0.55 V and sources 24 mA with VOH ≥ 2.2 V (Table 6). This supports direct driving of standard LVC/LVT logic loads or LED indicators with series resistors down to 100 Ω.

Does the DHVQFN20 package require soldering the thermal pad?

No. Per datasheet Section 5.1, the exposed pad (terminal 1 index area) has no electrical or mechanical requirement to be soldered. If connected, it must remain electrically floating or tied to GND-never to VCC or signal nets-to avoid compromising IOFF functionality or thermal performance.

How does the IOFF feature behave during brown-out conditions?

IOFF activates only when VCC reaches 0 V-not during brown-out. During undervoltage (e.g., VCC = 0.8 V), outputs remain functional but timing and logic thresholds degrade per Table 6. True IOFF protection requires full power removal, making it effective for hot-swap, not brown-out recovery.