SN74HC373PWT

Overview

The SN74HC373PWT 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 eight high-current true outputs capable of driving up to 15 LSTTL loads. Propagation delay (tpd) ranges from 55 ns to 155 ns at 2 V, 15 ns to 31 ns at 4.5 V, and 12 ns to 26 ns at 6 V. Static current is typically 8 µA at 6 V. The component is housed in a TSSOP-20 package.

Feature Summary

• Transparent data latching behavior where outputs follow inputs while the latch-enable signal is active
• Three-state output capability allowing connection to bus lines without interface components
• High-current drive capability suitable for capacitive or low-impedance loads

Applications

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

Procurement Notes

Verify the specific ordering suffix 'PWT' against the manufacturer's official Package Option Addendum to confirm the TSSOP-20 carrier type and lead finish. Ensure the design accommodates the specified thermal impedance for the PW package. Confirm RoHS compliance status and moisture sensitivity level ratings prior to assembly planning.

Selection Notes

Select this component when an octal latch with three-state outputs is required for bus-oriented systems. The HC logic family ensures compatibility with standard CMOS levels across the 2 V to 6 V range. Verify that the propagation delay specifications meet the system timing requirements under the intended load capacitance conditions.

Part Context

This part belongs to the SN74HC373A series of octal transparent D-type latches. It shares functional characteristics with other variants in the family, such as the SN74HC373AN and SN74HC373ADBR, differing primarily in packaging style and manufacturing lot traceability. The device is designed for general-purpose digital logic applications requiring parallel data storage and bus interfacing.

Replacement Considerations

SN74HC373APWR

FAQ

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

The output-enable input places the 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 continuous output current rating?

The absolute maximum rating for continuous output current is ±35 mA per pin.