Nexperia USA Inc. 74AHCT573D-Q100J

Overview

74AHCT573D-Q100 from Nexperia is an automotive-grade octal D-type transparent latch with 3-state outputs, designed for bus interface and data buffering in vehicle control modules. It features latch enable (LE) and output enable (OE) inputs, operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and provides TTL-compatible input thresholds. Used in engine control units (ECUs) for isolating microcontroller data buses during read/write cycles.

For engineers reviewing the 74AHCT573D-Q100 datasheet, 74AHCT573D-Q100 pinout, 74AHCT573D-Q100 application, or 74AHCT573D-Q100 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, 3.5 ns typical propagation delay at 5 V/15 pF, 8-bit transparent latching behavior, and SO20 package compatibility with legacy PCB footprints.

Technical Context

This device implements eight independent D-type latches with shared LE and OE controls, enabling simultaneous capture and tri-state control of parallel data paths. Its TTL-level inputs (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure direct interfacing with legacy 5 V logic without level shifters.

The latch operates in two distinct modes: transparent mode (LE = HIGH), where Qn follows Dn with sub-7 ns propagation delay; and latched mode (LE = LOW), where outputs hold prior data regardless of input changes. OE independently places all outputs in high-impedance state without affecting internal latch states.

Key Specifications

Pinout & Package

Package: SO20 (SOT163-1), plastic small outline, 20-pin, 7.5 mm body width, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT573D-Q100, the PW variant offers superior packaging for miniaturized designs, while the TI alternative trades speed and quiescent current for second-source availability - making the Nexperia SO20 version optimal for cost-sensitive, thermally stable automotive bus interfaces.

Availability

74AHCT573D-Q100 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS sensor interfaces requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for 74AHCT573D-Q100 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, analog, and MOSFET solutions, with core R&D and manufacturing in Europe and Asia.

This device belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for robustness in harsh environments - emphasizing AEC-Q100 compliance, wide temperature operation, and noise-immune signal integrity.

FAQ

What is the maximum clock frequency supported by the 74AHCT573D-Q100?

The 74AHCT573D-Q100 is not a clocked register but a transparent latch; it has no internal clock. Its usable data rate depends on propagation delay and setup/hold times. With tpd = 3.5 ns (typ), tsu = 3.5 ns, and th = 1.5 ns at 5 V, it supports reliable operation up to approximately 100 MHz in tightly controlled PCB layouts with matched trace lengths and proper termination.

Can the 74AHCT573D-Q100 interface directly with 3.3 V microcontrollers?

No - the 74AHCT573D-Q100 requires VCC = 4.5–5.5 V and has TTL input thresholds (VIH ≥ 2.0 V). While its inputs tolerate 5.5 V, driving it from a 3.3 V MCU violates VIH minimum under worst-case conditions. A level shifter or 74AHC573D-Q100 (CMOS-input variant) is required for 3.3 V systems.

Is the SO20 package RoHS and REACH compliant?

Yes - the 74AHCT573D-Q100 in SO20 (SOT163-1) package meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free terminations and halogen-free molding compound, as confirmed in Nexperia's official compliance documentation dated October 2023.

How does the latch behave when OE is HIGH and LE transitions?

When OE = HIGH, all Q0–Q7 outputs are forced into high-impedance regardless of LE state. Internal latches retain their last stored value - LE transitions continue to update internal storage, but outputs remain disconnected. This allows safe bus sharing while preserving data integrity across enable cycles.