SN74HC373NSR

Overview

The SN74HC373NSR is an octal transparent D-type latch with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature from -40°C to 85°C. The device features high-current outputs capable of driving up to 15 LSTTL loads, making it suitable for highly capacitive or low-impedance applications. Propagation delay ranges from 12 ns to 31 ns depending on the voltage level. It is housed in a 20-pin Small Outline package (SOIC) and supplied in tape and reel format.

Feature Summary

• Transparent data latching allows Q outputs to follow D inputs while the latch-enable signal is active.
• Three-state outputs provide high-impedance capability to drive bus lines without interface components.
• High-current output design enables direct driving of heavy capacitive or low-impedance loads.

Applications

• Buffer registers
• I/O ports
• Bidirectional bus drivers
• Working registers

Procurement Notes

Verify the specific ordering suffix 'SR' corresponds to the tape and reel packaging configuration required for automated assembly processes. Confirm that the 20-pin SOIC footprint matches the target PCB layout dimensions. Ensure the component meets RoHS compliance standards as indicated in the manufacturer's documentation before finalizing procurement specifications.

Selection Notes

Select this component when an octal latch with high-drive capability is required for bus interfacing. The three-state feature facilitates multiplexing multiple devices onto a shared data line. Verify that the input transition times and setup/hold requirements align with the system clock speeds to ensure reliable data capture during operation.

Part Context

This part belongs to the SN74HC373A family of octal transparent D-type latches. It shares functional characteristics with other variants in the series but differs in physical packaging and shipping configuration. The NSR designation specifically indicates the surface-mount small outline package and tape-and-reel delivery method used for high-volume manufacturing.

Replacement Considerations

SN74HC373ANSR

FAQ

How does the output-enable input affect internal latch operations?

The output-enable input places outputs in a high-impedance state but does not affect the internal operations of the latches. Data can be retained or entered while the outputs are disabled.

What is the maximum current capability of the outputs?

The outputs are designed with high-current capabilities, allowing them to drive up to 15 LSTTL loads directly.