Nexperia USA Inc. 74AHC573BQ,115

Overview

74AHC573BQ,115 from Nexperia is an 8-bit D-type transparent latch with 3-state outputs, designed for bus interface and data buffering in mixed-voltage digital systems. It features independent latch enable (LE) and output enable (OE) controls, operates from 2.0 V to 5.5 V, supports -40 °C to +125 °C ambient range, and uses DHVQFN20 (SOT764-1) package with 20 terminals. It is used in microcontroller peripheral interfacing where temporary data hold and bus isolation are required.

For engineers reviewing the 74AHC573BQ,115 datasheet, 74AHC573BQ,115 pinout, 74AHC573BQ,115 application, or 74AHC573BQ,115 equivalent, key selection considerations include its CMOS input level compatibility, 3.9 ns typical propagation delay at 5 V/50 pF, overvoltage-tolerant inputs up to 5.5 V, and thermal-enhanced DHVQFN20 packaging for high-density PCB layouts.

Technical Context

The device implements eight independent D-type latches with transparent operation when LE is HIGH and edge-triggered capture on LE HIGH-to-LOW transition. Its 3-state outputs are controlled solely by OE (active LOW), with no effect on internal latch state.

Input voltage thresholds follow CMOS logic levels (VIH ≥ 3.85 V at VCC = 5.5 V; VIL ≤ 1.65 V), and all inputs include Schmitt-trigger action for noise immunity. Overvoltage tolerance enables safe interfacing between 3.3 V and 5 V domains without level shifters.

Key Specifications

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 mm × 4.5 mm × 0.85 mm body, thermally enhanced exposed pad (non-soldered or floating GND), 20-terminal quad flat no-lead construction optimized for space-constrained and thermally demanding PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT573BQ,115 and SN74LVC573APWR, the 74AHC573BQ,115 uniquely balances wide supply range, overvoltage tolerance, and industrial temperature support - making it the only choice for robust 3.3 V/5 V bus isolation in harsh environments.

Availability

74AHC573BQ,115 is available at Aetrix Electronics and suitable for industrial control systems, PLC I/O modules, and embedded microcontroller bus expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC573BQ,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 industrial and consumer applications.

The 74AHC573BQ,115 belongs to Nexperia's advanced AHC logic family, engineered for low-power, high-speed bus interfacing in space-constrained and thermally demanding embedded systems.

FAQ

Can the 74AHC573BQ,115 operate reliably at 2.0 V supply?

Yes. The device is fully specified from 2.0 V to 5.5 V, with guaranteed VIH ≥ 1.5 V and VIL ≤ 0.5 V at VCC = 2.0 V, and propagation delay ≤ 11.0 ns (CL = 15 pF). It maintains full functionality including Schmitt-trigger noise immunity and 3-state control across this range.

Is the thermal pad on the DHVQFN20 package required to be soldered?

No. Per Nexperia documentation, the exposed pad (terminal 1) has no electrical or mechanical requirement to be soldered. If connected, it must remain floating or tied to GND - never left unconnected and ungrounded, as that may compromise thermal performance and EMI behavior.

What is the maximum clock frequency supported for latch control?

The device does not use a clock; it is edge-triggered on LE. Minimum LE pulse width is 5.0 ns at VCC = 4.5–5.5 V. With 3.9 ns tpd and 3.5 ns setup time, it supports latch update rates up to ~100 MHz in synchronous bus architectures when combined with appropriate controller timing.

Does OE affect internal latch state when asserted?

No. As confirmed in the functional description, OE controls only output driver enablement and has zero effect on the stored logic states within the eight D-type latches. Data remains preserved in the latches regardless of OE status, enabling true output isolation without data loss.