74LVC544ADB,112 Equivalent & Substitute Parts

Part Overview

The 74LVC544ADB,112 is an inverting transceiver IC manufactured by NXP USA Inc., designed for 3-state output applications in logic circuits. This 24-SSOP surface mount device operates across a supply voltage range of 1.2V to 3.6V and is rated for -40°C to 125°C operating temperatures. The device is classified as obsolete, making identification of functionally compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

74LVC544ADB,112

NXP USA Inc.In Stock: 106774LVC544ADB,112 Datasheet

Current PartRFQ

SN74LVTH574DB

Texas InstrumentsIn Stock: 1677SN74LVTH574DB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74LVC544ADB,112 is determined by the following critical parameters:

• Logic Function: Transceiver with inverting output capability and 3-state output configuration
• Bit Width: 8-bit per element architecture
• Output Drive Capability: Minimum 24mA output current (high and low)
• Supply Voltage Compatibility: Operating range must overlap with 1.2V ~ 3.6V
• Package Footprint: Surface mount SSOP package with 5.30mm width
• Temperature Range: Operating temperature support for -40°C minimum
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status

The SN74LVTH574DB from Texas Instruments is identified as a substitute part. While this device differs in specific logic function (D-Type Flip Flop versus Transceiver), it maintains compatibility through equivalent output drive specifications, overlapping supply voltage range, surface mount SSOP packaging, and matching regulatory compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Selection of the SN74LVTH574DB as a substitute for the 74LVC544ADB,112 is supported by the following engineering criteria:

Product Status: The 74LVC544ADB,112 is obsolete, while the SN74LVTH574DB maintains active product status with ongoing manufacturer support and availability.

Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring equivalent environmental and regulatory standing.

Output Drive Capability: The SN74LVTH574DB provides equal or superior output current specifications (32mA/64mA versus 24mA/24mA), ensuring adequate drive capability for existing circuit loads.

Supply Voltage Range: The substitute operates within the 2.7V ~ 3.6V range, which overlaps the upper portion of the main device's 1.2V ~ 3.6V specification. Applications requiring operation below 2.7V require alternative solutions.

Thermal Performance: The main device supports -40°C to 125°C operation, while the substitute supports -40°C to 85°C. Applications requiring operation above 85°C require alternative solutions.

Package Consideration: The substitute uses a 20-SSOP package versus the main device's 24-SSOP package. PCB layout modifications are required for pin-to-pin substitution.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVTH574DB directly replace the 74LVC544ADB,112 in all applications?

A: Direct replacement is not universal. The substitute maintains compatibility for applications operating within 2.7V ~ 3.6V supply voltage and -40°C to 85°C temperature ranges. Applications requiring lower supply voltages or higher operating temperatures require alternative solutions. Package differences (20-SSOP versus 24-SSOP) necessitate PCB layout modifications.

Q: What are the key differences between these devices?

A: The primary differences are logic function (transceiver versus flip-flop), output current specifications (24mA versus 32mA/64mA), supply voltage range (1.2V ~ 3.6V versus 2.7V ~ 3.6V), maximum operating temperature (125°C versus 85°C), and package pin count (24 versus 20).

Q: Are both devices RoHS compliant?

A: Yes, both the 74LVC544ADB,112 and SN74LVTH574DB maintain ROHS3 compliance and REACH unaffected status.

Q: What supply voltage range is safe for the substitute part?

A: The SN74LVTH574DB operates within 2.7V ~ 3.6V. Applications requiring operation at 1.2V ~ 2.6V cannot use this substitute.

Q: Does the package difference affect circuit performance?

A: Package differences require PCB layout modifications for physical mounting. The electrical performance characteristics remain independent of package type, provided proper PCB design practices are followed for the 20-SSOP footprint.

Q: Is the substitute part currently available?

A: The SN74LVTH574DB maintains active product status, indicating ongoing availability from Texas Instruments and authorized distributors, unlike the obsolete 74LVC544ADB,112.