SN74AHCT373DBRG4

Overview

The SN74AHCT373DBRG4 is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V and features TTL-compatible inputs. The device provides balanced CMOS 3-state outputs capable of sourcing and sinking up to 8mA. Propagation delay is specified at 9.5ns maximum at 5V VCC with a load capacitance of 15pF. It is housed in a 20-pin SSOP package.

Feature Summary

• Contains eight D-type latches sharing common latch enable (LE) and output enable (OE) control lines.
• Features balanced CMOS 3-state outputs that can actively drive high, low, or enter a high-impedance state.
• Includes TTL-compatible CMOS inputs designed for interfacing with standard logic devices.

Applications

• Parallel data storage
• Digital bus buffer

Procurement Notes

Verify the specific ordering suffix 'G4' corresponds to lead-free manufacturing and RoHS compliance as indicated by manufacturer documentation. Confirm the DB package designation matches the required 20-pin SSOP footprint for your PCB layout. Ensure the component meets the recommended operating conditions for your target application environment.

Selection Notes

Select this component when an octal latch with 3-state capability is required for systems operating strictly at 5V logic levels. The AHCT series ensures compatibility with TTL input thresholds while maintaining CMOS performance characteristics. Consider the SSOP package dimensions and thermal properties during the design phase to ensure proper board integration.

Part Context

This part belongs to the SNx4AHCT373 family of octal transparent D-type latches. The 'SN74' prefix indicates commercial temperature range operation, while 'AHCT' specifies the advanced high-speed CMOS technology with TTL-compatible inputs. The 'DB' suffix identifies the 20-pin shrink small-outline package variant.

Replacement Considerations

Direct replacements include other SN74AHCT373 variants from Texas Instruments with different package options such as TSSOP (PW), SOIC (DW), or VQFN (RKS). Cross-manufacturer equivalents may exist but require verification of pinout compatibility and electrical specifications against the official datasheet.

FAQ

What is the function of the OE pin?

The OE (Output Enable) pin controls the state of the outputs. When OE is low, the outputs are actively driven. When OE is high, the outputs enter a high-impedance state, disconnecting them from the circuit.

How do unused inputs behave?

Unused inputs must not be left floating. They should be terminated to either VCC or ground to prevent excessive power consumption and potential oscillations caused by slow input transitions.