onsemi MC74ACT373DWR2G

Overview of the MC74ACT373DWR2G Octal Transparent Latch by onsemi

The MC74ACT373DWR2G from onsemi is an octal (eight-channel) D-type transparent latch with tri-state outputs, widely utilized in bus-oriented electronic systems. Offered in a 20-pin SOIC or TSSOP package, this latch is engineered for high-speed, high-current applications and supports easy interfacing in complex digital circuits. As part of the MC74ACT373 series, the device provides robust and reliable data latching functionalities and is RoHS-compliant thanks to its Pb-free packaging.

Main Attributes of the MC74ACT373DWR2G Family

Designed for versatility, the MC74ACT373DWR2G boasts the following noted features:

Eight individual latches in a single, compact package

Tri-state outputs ideal for shared bus architectures

Each output can source or sink up to 24 mA, accommodating the demands of modern logic designs

TTL-compatible inputs for seamless integration with typical digital logic families

Available in lead/halogen-free configurations supporting eco-friendly requirements

Whether in controller interfaces, memory management, or digital subsystems, these characteristics make MC74ACT373DWR2G well suited for both new designs and drop-in upgrades.

MC74ACT373DWR2G Functional Details and Logic Functions

To appreciate the role of MC74ACT373DWR2G in electronic systems, it’s essential to understand its operational logic. Each of the eight latches operates under the control of two principal inputs: Latch Enable (LE) and Output Enable (OE).

Latch Enable (LE):

When LE is HIGH, the latch is transparent—data on the D inputs immediately propagates to the latch outputs.

When LE is LOW, the latch stores the input state from the preceding setup time before the HIGH-to-LOW transition.

Output Enable (OE):

When OE is LOW, outputs drive the bus (active state).

When OE is HIGH, outputs enter a high-impedance state, allowing for shared bus environments where multiple devices coexist without conflict.

This arrangement is useful for implementing synchronous and asynchronous bus control, temporary data holding during inter-module communication, and driving shared lines in multiplexed arrangements.

Electrical and Performance Specifications for MC74ACT373DWR2G

A thorough evaluation requires considering performance limits and expected operating points:

Maximum Ratings:

Exceeding specified voltages or current ratings may compromise device integrity and reliability.

I_OUT limits should strictly be observed to prevent output driver damage.

DC Characteristics:

Inputs accept standard TTL voltage levels (0.8 V to 2.0 V for typical logic thresholds).

Current consumption (ICC) and input leakage are optimized for low-power operation at both 3.3 V and 5.0 V supply ranges.

AC Characteristics:

Designed for high-speed operation, propagation delays and setup/hold times support rapid bus transactions.

Testing across 3.3 V and 5.0 V voltage ranges ensures compatibility with a spectrum of digital systems.

Engineers should refer to the detailed datasheet for precise limits when validating the device in custom applications.

MC74ACT373DWR2G Packaging Details and Physical Dimensions

The MC74ACT373DWR2G is delivered in two package options to meet board density and assembly needs:

SOIC-20 Wide Body (751D-05): Suitable for automated assembly and reflow soldering. Mechanical outlines conform to JEDEC and ASME standards for industrial compatibility.

TSSOP-20 (948E): Offers reduced footprint for space-constrained PCBs, with clear datum references for surface-mount processes.

Each package supports lead-free reflow soldering, and designers should refer to the onsemi Soldering and Mounting Techniques Reference Manual for optimal PCB footprint design.

MC74ACT373DWR2G Suggested Usage Conditions

Reliable operation requires that system voltages, environmental conditions, and timing constraints fall within the manufacturer’s recommended ranges:

Supply voltage range: 3.3 V ±0.3 V or 5.0 V ±0.5 V

Input voltage level specification ensures robust logic response

Extended operation outside recommended parameters may affect lifespan and reliability

Designers should ensure appropriate power supply selection and signal integrity when deploying MC74ACT373DWR2G into high-speed or low-noise environments.

MC74ACT373DWR2G Use Cases and Design Guidelines

Engineers typically employ the MC74ACT373DWR2G in bus-oriented digital subsystems where external data synchronization and temporary storage are required. Common scenarios include:

Memory address/data bus demultiplexing and control

Signal buffering between microcontrollers and peripherals

Temporary storage in shift registers or I/O expansion modules

When integrating MC74ACT373DWR2G, attention should be paid to output loading (up to 24 mA per channel), timing margins, and the potential for signal crosstalk in high-density designs. Utilizing its tri-state outputs allows multiple devices to share communication lines safely, essential for modular or scalable architectures.

Alternative or Substitute Devices for MC74ACT373DWR2G

Should the MC74ACT373DWR2G be unavailable or a project require alternate specifications, the MC74AC373 series from onsemi offers protocol compatibility and similar performance. Engineers may also consider other octal D-type transparent latches with tri-state outputs from reputable manufacturers, always comparing electrical and mechanical parameters for drop-in replacement.

Conclusion

: MC74ACT373DWR2G as a Solution in Bus-Oriented Systems

The MC74ACT373DWR2G octal transparent latch from onsemi provides a capable, high-speed digital latching solution for engineers designing bus-organized systems. Its robust feature set—encompassing tri-state outputs, TTL compatibility, and flexible packaging—ensures reliable, scalable integration. By understanding key functions, performance metrics, and design considerations, selection engineers and procurement professionals can confidently assess the MC74ACT373DWR2G for efficient implementation in new or existing digital platforms.