Nexperia USA Inc. 74LVC574ABQ,115

Overview

74LVC574ABQ,115 from Nexperia is an octal positive-edge-triggered D-type flip-flop with 3-state outputs, 5 V tolerant I/O, and IOFF partial power-down protection. It operates from 1.2 V to 3.6 V supply, supports mixed-voltage interfacing (3.3 V ↔ 5 V), and features Schmitt-trigger inputs for noise immunity. Used in bus interface, data latching, and level translation in industrial control and embedded digital systems.

For engineers reviewing the 74LVC574ABQ,115 datasheet, 74LVC574ABQ,115 pinout, 74LVC574ABQ,115 application, or 74LVC574ABQ,115 equivalent, key selection criteria include 3-state timing (t_en/t_dis ≤ 9.5 ns), 5.5 V overvoltage tolerance on all inputs/outputs, IOFF-enabled safe power-down behavior, and DHVQFN20 thermal-enhanced packaging for high-density PCB layouts.

Technical Context

This device implements eight independent D-type latches synchronized to the rising edge of CP, with asynchronous 3-state control via active-low OE. Each flip-flop samples Dn at the LOW-to-HIGH clock transition and holds state until the next valid edge - set-up time as low as 2.0 ns (VCC = 3.0–3.6 V) and hold time ≥ +1.5 ns ensure robust timing margins in high-speed synchronous buses.

The IOFF circuit actively disables outputs when VCC = 0 V, blocking backflow current during partial power-down sequences. Schmitt-trigger inputs provide hysteresis (typ. 0.3 V) to tolerate slow-rising signals and improve noise rejection in noisy industrial environments - a critical feature absent in standard LVC logic.

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 (not electrically connected unless tied to GND). Optimized for thermal dissipation and high-density routing in space-constrained embedded controllers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74LVC574APWRE4, the 74LVC574ABQ,115 offers superior thermal performance and smaller footprint; versus 74LVCH16374ADGG,118, it provides essential IOFF and overvoltage protection at half the pin count - making it optimal for compact, mixed-voltage, and power-sequenced systems.

Availability

74LVC574ABQ,115 is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller GPIO expansion, legacy peripheral adapter, and test equipment signal conditioning requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for 74LVC574ABQ,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 high-volume, high-reliability logic, discrete, and MOSFET solutions for industrial, computing, and consumer markets.

The 74LVC series delivers advanced low-voltage CMOS logic with enhanced robustness - designed specifically for energy-efficient, mixed-voltage digital systems requiring interoperability, thermal resilience, and long-term supply stability.

FAQ

Can 74LVC574ABQ,115 operate reliably with a 1.2 V supply?

Yes - the device is fully specified down to 1.2 V VCC, with guaranteed functionality including 5.5 V input tolerance, Schmitt-trigger inputs, and 3-state control. At 1.2 V, propagation delay increases to 17.0 ns and maximum frequency drops to ~100 MHz, but all static and dynamic parameters remain within datasheet limits across −40 °C to +125 °C.

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

The exposed pad (terminal 1 index area) is a thermal slug, not an electrical pin. It must be soldered to a PCB copper pour connected to GND for optimal heat dissipation. Per datasheet note, if soldered, the land should remain floating or connected to GND - no electrical connection is required, but thermal performance degrades significantly if left unsoldered or isolated.

How does IOFF protect the device during power-down sequences?

When VCC drops to 0 V, the IOFF circuit detects loss of supply and forces all outputs into high-impedance state - even if input or output pins remain biased at 5 V. This blocks reverse current flow that could damage upstream drivers or cause unintended logic states, enabling safe hot-swap and partial power-down in modular systems.

Is the 74LVC574ABQ,115 automotive qualified?

No - per Nexperia's legal disclaimers, this part is explicitly labeled "non-automotive qualified" and has not undergone AEC-Q100 stress testing or qualification for automotive use. It is rated for −40 °C to +125 °C operation but lacks automotive-specific reliability validation, fault coverage, or PPAP documentation required for vehicle applications.