Nexperia USA Inc. 74HCT573PW,118

Overview

74HCT573PW,118 from Nexperia is an octal D-type transparent latch with 3-state outputs, designed for bus-oriented digital systems requiring data latching and output isolation. It features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers 18 ns typical propagation delay (Dn→Qn) at VCC = 4.5 V and CL = 50 pF. It serves as an I/O port interface in microprocessor-based control systems.

For engineers reviewing the 74HCT573PW,118 datasheet, 74HCT573PW,118 pinout, 74HCT573PW,118 application, or 74HCT573PW,118 equivalent, this device is selected for bidirectional bus buffering, address/data latching in 8-bit embedded controllers, and level-shifted I/O expansion where TTL-level compatibility and 3-state bus drive are required.

Technical Context

The 74HCT573PW,118 implements eight independent D-latch cells controlled by a shared active-HIGH latch enable (LE) and active-LOW output enable (OE). Latching occurs on the HIGH-to-LOW transition of LE, capturing D-input states with 13 ns minimum setup time and 9 ns minimum hold time at VCC = 4.5 V. OE operates independently-asserting it places all Q-outputs in high-impedance without altering internal latch states.

Its TTL-compatible inputs accept standard 5 V logic levels while driving CMOS loads, enabling seamless interfacing with legacy microcontrollers and FPGAs. The device uses silicon-gate CMOS technology, achieving 8 μA typical ICC at VCC = 5.5 V and 25 °C, with latch-up immunity exceeding 100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT573PWR and 74LVC573APW,118, the 74HCT573PW,118 uniquely balances 5 V TTL compatibility, sub-20 ns timing, and ultra-low quiescent current-making it optimal for industrial 5 V control systems where signal integrity and power efficiency coexist.

Availability

74HCT573PW,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller address latching, and legacy peripheral interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT573PW,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 leading Dutch semiconductor manufacturer specializing in high-volume logic, analog, and discrete components, with emphasis on reliability, efficiency, and automotive-grade quality.

The 74HCT573 belongs to Nexperia's industry-standard HC/HCT logic family, engineered for robust 5 V digital interfacing in industrial automation, test equipment, and legacy system upgrades where TTL compatibility and latch functionality are essential.

FAQ

What is the maximum clock frequency supported by the 74HCT573PW,118?

The 74HCT573PW,118 does not operate on a clock signal-it is edge-triggered only by the LE input. Its usable data rate depends on propagation delay (20 ns max Dn→Qn) and setup/hold timing (13 ns su / 9 ns h). For reliable transparent-mode operation with continuous input changes, the effective maximum toggle rate is ~25 MHz; for latched operation, LE pulse repetition can exceed 30 MHz given proper timing margins.

Can the 74HCT573PW,118 drive LEDs directly?

Yes-the 74HCT573PW,118 can source or sink up to 6 mA per output at VCC = 4.5 V, sufficient to drive low-current indicator LEDs (e.g., 2–5 mA at 1.8–2.2 V forward voltage) with appropriate series resistors. For higher-current LEDs (>10 mA), external drivers or buffer transistors are required to avoid exceeding output current limits or degrading VOL/VOH specifications.

Is the exposed pad on the TSSOP20 package electrically connected?

No-the exposed thermal pad on the SOT360-1 (TSSOP20) package of the 74HCT573PW,118 is not electrically connected to any internal node. Nexperia documentation explicitly states it has no electrical or mechanical requirement to be soldered; if soldered, it must remain floating or be tied to GND to avoid unintended coupling or thermal stress.

How does the 74HCT573PW,118 differ from the 74HC573PW,118?

The 74HCT573PW,118 uses TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), enabling direct interfacing with 5 V TTL and bipolar logic. The 74HC573PW,118 uses CMOS thresholds (VIH ≈ 3.15 V at VCC = 4.5 V), requiring level shifting when driven by TTL sources. Both share identical pinout, 3-state outputs, and latch architecture-but input voltage compatibility defines their system integration role.