Nexperia USA Inc. 74HC573PW,112

Overview

74HC573PW,112 from Nexperia is an 8-bit CMOS D-type transparent latch with 3-state outputs, designed for bus-oriented digital systems. It features independent latch enable (LE) and output enable (OE) controls, operates from 2.0 V to 6.0 V, supports -40 °C to +125 °C ambient range, and delivers 17 ns typical propagation delay at 4.5 V. It serves as a bidirectional I/O port buffer in microprocessor peripheral interfacing.

For engineers reviewing the 74HC573PW,112 datasheet, 74HC573PW,112 pinout, 74HC573PW,112 application, or 74HC573PW,112 equivalent, key selection criteria include 3-state bus drive capability, TTL-compatible input thresholds (for 74HCT variant), latch transparency timing, thermal performance in TSSOP20 package, and compatibility with industrial-grade microcontroller address/data bus isolation.

Technical Context

The device implements eight independent D-type latches with synchronous parallel loading controlled by a single active-HIGH LE signal. Data propagates transparently when LE is HIGH; on LE HIGH-to-LOW transition, inputs are latched with setup/hold times of 13 ns/9 ns (at 4.5 V). Output state is decoupled from latch state via active-LOW OE, enabling high-impedance bus release without affecting stored data.

All inputs include clamp diodes for overvoltage tolerance, supporting interface to signals exceeding VCC when used with current-limiting resistors. The logic family complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), and exhibits latch-up immunity >100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

TSSOP20 (SOT360-1) package: 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 74HCT573PW,112, the 74HC573PW,112 offers superior noise immunity in 5 V CMOS systems but lacks native TTL input compatibility; versus SN74LV573APWR, it provides broader voltage flexibility and drop-in replacement in existing TSSOP20 layouts, albeit with 7 ns higher propagation delay at 3.3 V.

Availability

74HC573PW,112 is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, automotive body electronics, and embedded computing requiring stable component supply across extended temperature ranges.

Supply support for 74HC573PW,112 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, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial and automotive markets.

The 74HC573 belongs to Nexperia's standard logic portfolio, engineered for robust bus interface and data latching in space-constrained, thermally demanding embedded systems where pin compatibility and long-term supply stability are critical.

FAQ

What is the maximum clock frequency supported by the 74HC573PW,112 in transparent mode?

The 74HC573PW,112 does not operate on a clock signal-it functions asynchronously. In transparent mode (LE = HIGH), its usable data rate is limited by propagation delay (17 ns typ at 4.5 V) and setup/hold timing. For reliable operation with clean edges, maximum toggle rate is ~25 MHz with 50 pF load; higher frequencies require careful signal integrity design and reduced capacitive loading.

Can the 74HC573PW,112 drive LEDs directly without external transistors?

No. Its absolute maximum output current is ±35 mA per pin, but recommended DC output is ±7.8 mA at VCC = 4.5 V. Direct LED driving risks exceeding safe operating area and degrading lifetime. Use external NPN/PNP transistors or dedicated LED drivers for currents >5 mA per segment; the device is intended for logic-level bus buffering, not power switching.

Is the exposed pad on the TSSOP20 package electrically connected?

No. The exposed thermal pad on the SOT360-1 (TSSOP20) package is not electrically connected to any internal node. Per Nexperia documentation, it may remain floating or be soldered to GND for thermal improvement-but must not be connected to VCC or other signals. No electrical requirement exists for soldering it.

How does the 74HC573PW,112 behave when OE is HIGH and LE transitions?

When OE is HIGH, all Q0–Q7 outputs are forced into high-impedance state regardless of LE state or stored data. LE transitions have no effect on output voltage or current-only the internal latch states change. Outputs remain in high-Z until OE returns LOW, at which point the last-latched data appears (if LE is LOW) or passes through (if LE is HIGH).