74LVC544ADB,118 Equivalent & Substitute Parts

Part Overview

The 74LVC544ADB,118 is an inverting transceiver IC manufactured by NXP Semiconductors, designed for 3-state logic applications in the 74LVC series. This component features 1 element with 8 bits per element, operating across a supply voltage range of 1.2V to 3.6V, with output capability of 24mA for both high and low states. The device is housed in a 24-SSOP surface mount package with a width of 5.30mm.

The product status is listed as Obsolete, making substitute part identification essential for ongoing design support, production continuity, and system maintenance. Alternative components must maintain functional equivalence in transceiver operation, 3-state output capability, and physical compatibility within the specified package constraints.

Substiute Parts

74LVC544ADB,118

NXP SemiconductorsIn Stock: 115974LVC544ADB,118 Datasheet

Current PartRFQ

SN74LVTH574DBR

Texas InstrumentsIn Stock: 3285SN74LVTH574DBR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74LVC544ADB,118 is based on the following critical parameters that define functional and physical compatibility:

Primary Substitution Criteria:

• Logic function classification (Transceiver or Flip Flop with equivalent switching capability)
• Output type (3-State or Tri-State capability)
• Number of bits per element (8-bit configuration)
• Supply voltage compatibility (overlap within 1.2V ~ 3.6V range or 2.7V ~ 3.6V range)
• Surface mount packaging with SSOP form factor
• Operating temperature range support (-40°C minimum)
• RoHS3 compliance and MSL rating

The identified substitute part, SN74LVTH574DBR from Texas Instruments, operates as a D-Type Flip Flop with Tri-State output in the 74LVTH series. While the logic function differs from the inverting transceiver topology, the substitute maintains 8-bit per element configuration, tri-state output capability, compatible supply voltage range (2.7V ~ 3.6V), surface mount SSOP packaging (20-SSOP, 5.30mm width), and equivalent environmental compliance ratings. The substitute supports the same operating temperature minimum of -40°C and maintains RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The SN74LVTH574DBR is available as an Active product from Texas Instruments, providing long-term supply assurance compared to the Obsolete status of the 74LVC544ADB,118. Both components maintain ROHS3 compliance and MSL Level 1 ratings, ensuring equivalent environmental and regulatory compatibility.

The substitute operates within the overlapping supply voltage range of 2.7V to 3.6V, which encompasses the upper operating range of the main part. The output current capability of the substitute (32mA high, 64mA low) exceeds the main part specification (24mA both directions), providing improved drive capability. The operating temperature range of the substitute extends to 85°C maximum, compared to 125°C for the main part; applications requiring operation above 85°C require evaluation of thermal management or alternative solutions.

Package pin count differs between the 24-SSOP main part and the 20-SSOP substitute, requiring PCB layout and schematic verification to confirm functional pin mapping and signal routing compatibility. Both packages maintain the same 5.30mm width specification for board space considerations.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVTH574DBR directly replace the 74LVC544ADB,118 without circuit modification?

A: Direct pin-for-pin replacement is not possible due to different package pin counts (24-SSOP versus 20-SSOP) and different logic function topologies (inverting transceiver versus D-Type flip flop). Circuit schematic and PCB layout verification is required to confirm functional compatibility and proper signal routing.

Q: What is the primary difference in logic function between these parts?

A: The 74LVC544ADB,118 operates as an inverting transceiver with 3-state output, designed for bidirectional signal transmission with inversion. The SN74LVTH574DBR operates as a D-Type flip flop with tri-state output, designed for edge-triggered data capture and storage. The functional difference requires application-level evaluation to confirm suitability.

Q: Are there supply voltage compatibility concerns?

A: The substitute operates within the 2.7V to 3.6V range, which overlaps with the main part's 1.2V to 3.6V range. Applications operating below 2.7V supply voltage cannot use the substitute without alternative solutions.

Q: How do the output current specifications compare?

A: The substitute provides higher output current capability (32mA high, 64mA low) compared to the main part (24mA both directions). This increased drive capability is compatible with applications designed for the lower current specification of the main part.

Q: What are the temperature range implications?

A: The substitute maximum operating temperature is 85°C, compared to 125°C for the main part. Applications requiring sustained operation above 85°C require thermal analysis or alternative component selection.

Q: Are both components RoHS compliant?

A: Both the 74LVC544ADB,118 and SN74LVTH574DBR are ROHS3 compliant with MSL Level 1 ratings, ensuring equivalent environmental and regulatory compliance for manufacturing and field deployment.