74LVC544AD,112 Equivalent & Substitute Parts

Part Overview

The 74LVC544AD,112 is an inverting transceiver IC manufactured by NXP USA Inc., designed for logic-level signal inversion and buffering applications. This device features 1 element with 8 bits per element, 3-state output capability, and operates across a supply voltage range of 1.2V to 3.6V. The part is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74LVC544AD,112

NXP USA Inc.In Stock: 101874LVC544AD,112 Datasheet

Current PartRFQ

SN74LVT574DW

Texas InstrumentsIn Stock: 2277SN74LVT574DW Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74LVC544AD,112 is constrained by the following critical parameters:

• Logic Function: The main part is an inverting transceiver with 3-state output. Substitute parts must provide equivalent signal inversion and tri-state buffering capability.
• Bit Configuration: 1 element with 8 bits per element defines the data path width and must be matched in substitutes.
• Output Drive Capability: Output current ratings (24mA high/low) establish the load-driving capacity required for system operation.
• Supply Voltage Range: Operating range of 1.2V to 3.6V defines compatibility with low-voltage logic systems.
• Operating Temperature: -40°C to 125°C temperature range specifies the thermal operating envelope.
• Package Compatibility: 24-SOIC surface-mount package with 0.295" width and 7.50mm width dimensions must be maintained for PCB layout compatibility.
• Compliance Standards: RoHS3 compliance and MSL Level 1 rating ensure regulatory and manufacturing process alignment.

The identified substitute SN74LVT574DW from Texas Instruments represents a functional alternative within the 74LV logic family, though with specific parameter variations that require engineering evaluation.

Parameter Comparison

Engineering Selection Recommendations

The SN74LVT574DW is an active-status alternative suitable for applications where the following conditions are met:

• Supply Voltage Compatibility: The substitute operates within 2.7V to 3.6V, which is a subset of the main part's 1.2V to 3.6V range. Systems operating below 2.7V cannot use this substitute.
• Temperature Range Consideration: The substitute supports -40°C to 85°C, which is narrower than the main part's -40°C to 125°C range. Applications requiring operation above 85°C require alternative solutions.
• Output Current: The substitute provides higher output drive capability (32mA/64mA vs. 24mA/24mA), making it suitable for higher-impedance loads.
• Package Footprint: The substitute uses a 20-SOIC package versus the main part's 24-SOIC package. PCB layout modifications are required; direct pin-for-pin substitution is not possible.
• Logic Inversion: The main part provides inverting logic; the substitute provides non-inverted output. Circuit-level logic adjustments may be necessary.
• Regulatory Compliance: Both parts maintain RoHS3 compliance and MSL Level 1 rating, ensuring manufacturing process compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVT574DW be used as a direct pin-for-pin replacement for the 74LVC544AD,112?

A: No. The main part uses a 24-SOIC package while the substitute uses a 20-SOIC package. PCB layout redesign is required. Additionally, the logic function differs (inverting vs. non-inverted), requiring circuit-level evaluation.

Q: What is the minimum supply voltage for the SN74LVT574DW substitute?

A: The substitute operates at 2.7V minimum supply voltage. The original 74LVC544AD,112 supports operation down to 1.2V. Systems requiring sub-2.7V operation cannot use this substitute.

Q: Does the substitute support the full temperature range of the original part?

A: No. The substitute operates from -40°C to 85°C, while the original part supports -40°C to 125°C. Applications requiring operation above 85°C must use alternative components.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the 74LVC544AD,112 and SN74LVT574DW are RoHS3 compliant with MSL Level 1 rating, ensuring compatibility with standard manufacturing processes.

Q: What is the key functional difference between these parts?

A: The main part is an inverting transceiver; the substitute is a non-inverting D-type flip-flop. Logic inversion behavior differs, requiring circuit redesign to maintain system functionality.

Q: Which part has higher output drive capability?

A: The SN74LVT574DW provides 32mA/64mA output current versus the 74LVC544AD,112's 24mA/24mA, offering greater load-driving capacity for higher-impedance applications.