74AHCT573D,118

Latches Overview

The Nexperia 74AHCT573D,118 is an octal D-type transparent latch with 3-state outputs housed in a SO20 (SOT163-1) package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports ambient temperatures from -40 °C to +125 °C. The device features TTL-compatible input levels, balanced propagation delays, and Schmitt-trigger action on all inputs. It includes latch enable (LE) and output enable (OE) controls, allowing data transparency when LE is HIGH and storage upon the HIGH-to-LOW transition. Outputs enter a high-impedance state when OE is HIGH.

Latches Feature Summary

• Octal D-type transparent latch architecture with 3-state outputs
• TTL-compatible input levels for direct interfacing with TTL logic
• Schmitt-trigger action on all inputs for improved noise immunity
• Overvoltage tolerant inputs up to 5.5 V for mixed-voltage translation

Latches Applications

• Data buffering in digital systems
• Register applications requiring parallel data storage
• Mixed voltage level translation between TTL and CMOS domains
• Bus holding circuits with controlled output enablement

Latches Procurement Notes

Verify the ordering suffix '118' against current Nexperia documentation to confirm specific reel or tape specifications if required for automated assembly. Ensure the SO20 package variant matches the design footprint. Confirm that the AHCT designation aligns with the system's TTL input voltage requirements rather than standard AHC CMOS levels. Cross-reference the temperature grade to ensure compliance with operational environmental limits.

Latches Selection Notes

Select this component when TTL-level input compatibility is required alongside CMOS output performance. The AHCT variant ensures proper logic threshold recognition from TTL sources without additional interface circuitry. Consider the SO20 package dimensions for PCB layout constraints. Verify that the 3-state output capability meets bus isolation requirements. Ensure the operating voltage range covers the system's nominal 5 V supply with appropriate margins.

Latches Part Context

This part belongs to the 74AHC/AHCT family of high-speed CMOS logic devices manufactured by Nexperia. The 74AHCT573 is functionally identical to the 74AHCT373 but utilizes positive logic conventions for the latch enable signal. It is designed for general-purpose digital applications requiring reliable data latching and bus driving capabilities in standard 5 V logic environments.

Latches Replacement Considerations

The datasheet states the device is functionally identical to the 74AHCT373. Other variants in the same family include the 74AHC573 (CMOS inputs) and alternative packages such as TSSOP20 (PW) or DHVQFN20 (BQ). Verify pinout compatibility and electrical characteristics before substituting with non-Nexperia equivalents.