Nexperia USA Inc. 74AHCT573D,118

Overview

74AHCT573D,118 from Nexperia is an octal D-type transparent latch with 3-state outputs, designed for bus interface and data storage in 5 V TTL-level systems. It features independent latch enable (LE) and output enable (OE) controls, overvoltage-tolerant inputs up to 5.5 V, propagation delay as low as 3.5 ns at 5 V, and operates across –40 °C to +125 °C. Used in microcontroller address/data latching and memory interfacing.

For engineers reviewing the 74AHCT573D,118 datasheet, 74AHCT573D,118 pinout, 74AHCT573D,118 application, or 74AHCT573D,118 equivalent, this device serves as a high-speed, TTL-compatible latch for bidirectional bus isolation, level translation in mixed-voltage subsystems, and synchronous data capture where precise LE timing and 3-state control are required.

Technical Context

The 74AHCT573D,118 implements eight independent D-latches with shared LE and OE inputs. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure direct compatibility with legacy 5 V logic families. The latch operates in transparent mode when LE is HIGH, capturing and holding data on the HIGH-to-LOW transition of LE.

Output enable (OE) is active LOW and fully decoupled from latch state-asserting OE places all Q0–Q7 outputs in high-impedance without altering stored data. Inputs tolerate up to 5.5 V regardless of VCC, enabling use as a 3.3 V system interface to 5 V peripherals.

Key Specifications

Pinout & Package

74AHCT573D,118 is housed in a plastic small outline package (SO20), SOT163-1, with 20 leads and 7.5 mm body width. Pin 1 is index-marked; pin 10 is GND; pin 20 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT373D,118, the 74AHCT573D,118 offers identical functionality in the same SO20 package, while SN74AHCT573PWR provides identical performance in a smaller TSSOP20 form factor-enabling layout optimization without compromising timing or voltage compatibility.

Availability

74AHCT573D,118 is available at Aetrix Electronics and suitable for microcontroller bus interfacing, memory address latching, and industrial I/O expansion requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT573D,118 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 optimized for efficiency, reliability, and miniaturization in industrial and automotive applications.

The 74AHCT series targets robust, pin-compatible replacements for legacy TTL logic in 5 V systems-designed specifically for interoperability, low power, and wide temperature operation without sacrificing speed or noise immunity.

FAQ

What is the maximum clock or data rate supported by the 74AHCT573D,118?

The 74AHCT573D,118 does not operate on a clock signal but responds to edge-controlled LE and OE. With a typical D→Q propagation delay of 3.5 ns at 5 V and 15 pF load, it supports reliable data capture at bus frequencies exceeding 100 MHz when used with appropriate setup/hold timing margins and controlled slew rates.

Can the 74AHCT573D,118 be used with a 3.3 V supply?

No-the 74AHCT573D,118 is specified only for 4.5 V to 5.5 V operation. For 3.3 V systems, use the 74AHC573D,118 variant, which has CMOS input thresholds and supports 2.0 V to 5.5 V supply. Mixing AHCT input levels with sub-4.5 V VCC violates recommended operating conditions and risks incorrect logic interpretation.

How does the overvoltage-tolerant input feature work in practice?

Inputs D0–D7 and LE/OE tolerate up to 5.5 V even when VCC = 4.5 V, due to internal clamping structures. This allows safe connection to 5 V signals (e.g., from legacy peripherals) while the device runs from a regulated 4.5–5.5 V rail-no external resistors or translators needed, provided input current stays within ±20 mA limits.

Is there a thermal pad or exposed die attach pad on the SO20 package?

No-the SOT163-1 (SO20) package used for 74AHCT573D,118 has no thermal pad or exposed metal slug. Thermal dissipation relies on PCB copper area connected to pins 10 (GND) and 20 (VCC). For high-duty-cycle applications, use ≥2 oz copper and thermal vias under these pins to maintain junction temperature below 125 °C.