Nexperia USA Inc. 74HCT573D,653

Overview

74HCT573D,653 from Nexperia is an octal D-type transparent latch with 3-state outputs, designed for bus-oriented digital systems requiring data latching and bidirectional bus 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 propagation delay of 20–53 ns (Dn→Qn) under 50 pF load. It is commonly used in microprocessor I/O port expansion and address/data bus demultiplexing.

For engineers reviewing the 74HCT573D,653 datasheet, 74HCT573D,653 pinout, 74HCT573D,653 application, or 74HCT573D,653 equivalent, key selection criteria include its TTL-level input compatibility, 3-state output enable timing (ten = 17–45 ns), latch enable active-HIGH behavior, and SO20 package thermal performance up to +125 °C.

Technical Context

The 74HCT573D,653 implements eight independent D-latch cells sharing common LE (latch enable, active HIGH) and OE (output enable, active LOW) control signals. Its transparent mode allows real-time input-to-output tracking when LE is HIGH; a HIGH-to-LOW LE transition captures and holds the input state at the preceding setup time.

OE operates independently of latch state-asserting OE HIGH places all Q0–Q7 outputs in high-impedance OFF-state without altering stored data. Input clamp diodes support interfacing with voltages exceeding VCC via external current-limiting resistors.

Key Specifications

Pinout & Package

74HCT573D,653 is supplied in SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, surface-mount, with gull-wing leads. Pin 1 index located at top-left corner; pin numbering follows standard counter-clockwise convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT373D,653 and SN74HCT573N, the 74HCT573D,653 provides optimal balance of industrial temperature range, SO20 manufacturability, single-OE simplicity, and 80 μA typical ICC-making it the preferred choice for volume production of bus-isolated embedded controllers.

Availability

74HCT573D,653 is available at Aetrix Electronics and suitable for microprocessor I/O expansion, address/data bus demultiplexing, industrial PLC input conditioning, and legacy system bus isolation requiring stable component supply across extended temperature ranges.

Supply support for 74HCT573D,653 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, reliable components for automotive, industrial, and consumer applications, with leadership in logic, analog, and MOSFET technologies.

The 74HCT573D,653 belongs to Nexperia's 74HCT logic family-engineered for robust TTL-compatible interfacing in noise-prone industrial environments while maintaining CMOS power efficiency and wide temperature operation.

FAQ

What is the maximum clock frequency supported by the 74HCT573D,653?

The 74HCT573D,653 is not a clocked register but a transparent latch: its effective data throughput depends on LE pulse width and propagation delays. With tW(LE) ≥ 16 ns (min) and tpd(D→Q) ≤ 53 ns, it supports reliable operation in systems with bus cycles ≥ 100 ns-equivalent to sustained 10 MHz burst rates in latch-and-hold mode.

Can the 74HCT573D,653 be used with a 3.3 V microcontroller?

No-its TTL input thresholds require VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V, but it does not guarantee recognition of 3.3 V logic HIGHs. For 3.3 V systems, use 74LVC573A or level-shifting buffers; direct connection risks unreliable latching due to marginal VIH margin.

How does the 3-state output disable timing affect bus sharing?

When OE transitions HIGH, outputs enter high-impedance within ten = 17–45 ns (typ–max). This defines the minimum dead time required before another device drives the same bus line-critical for avoiding bus contention in multi-master systems like ISA or custom parallel interconnects.

Is the SO20 package of 74HCT573D,653 RoHS compliant and lead-free?

Yes-the 74HCT573D,653 in SO20 (SOT163-1) packaging meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations and halogen-free molding compound, certified per Nexperia's environmental compliance documentation (Doc ID: REACH_RoHS_Summary_74HCT573).