74ACTQ573QSCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ573QSCX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-QSOP surface mount package.

Substiute Parts

74ACTQ573QSCX

onsemiIn Stock: 79474ACTQ573QSCX Datasheet

Current PartRFQ

SN74ACT573DBR

Texas InstrumentsIn Stock: 3186SN74ACT573DBR Datasheet

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SN74ACT573PW

Texas InstrumentsIn Stock: 2147SN74ACT573PW Datasheet

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SN74ACT573PWR

Texas InstrumentsIn Stock: 10256SN74ACT573PWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ573QSCX is determined by strict alignment of the following electrical and mechanical parameters:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Supply Voltage Range: 4.5V ~ 5.5V
• Independent Circuits: 1
• Output Current Capability: 24mA (High and Low)
• Operating Temperature Range: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Base Product Number: 74ACT573 or 74ACTQ573 series

All identified substitute parts maintain electrical compatibility across these core parameters. Package variations (QSOP, SSOP, TSSOP) represent different physical form factors of the same logical device and are considered functionally equivalent when circuit board layout permits accommodation of the alternative package dimensions.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT573PWR is the primary substitute for the 74ACTQ573QSCX. This Texas Instruments part maintains full electrical equivalence across all critical parameters and carries Active product status with ROHS3 compliance certification. Current inventory availability (10,200 pcs) supports both immediate procurement and long-term supply chain planning. The 20-TSSOP package (0.173", 4.40mm width) is narrower than the original QSOP package and requires PCB layout verification for pin-to-pin compatibility.

SN74ACT573DBR provides an alternative substitute with Active product status and ROHS3 compliance. The 20-SSOP package (0.209", 5.30mm width) is wider than both the original QSOP and the TSSOP alternatives, necessitating careful board layout assessment. Inventory availability (3,130 pcs) is adequate for standard applications.

SN74ACT573PW is listed as Discontinued at DiGi Electronics and should be considered only when existing inventory reserves are available or when specific package requirements mandate the 20-TSSOP form factor. ROHS3 compliance is confirmed.

All three substitute parts satisfy the electrical requirements of the obsolete 74ACTQ573QSCX and are suitable for direct functional replacement when package dimensions are accommodated within the circuit board design.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT573PWR directly replace 74ACTQ573QSCX without circuit modification?

A: Electrical substitution is direct. Pin configuration and functional behavior are identical. Physical package dimensions differ (20-TSSOP vs. 20-QSOP), requiring PCB layout verification to confirm footprint compatibility and trace routing accommodation.

Q: What is the difference between the QSOP, SSOP, and TSSOP packages?

A: These designations refer to surface mount package form factors with different body widths: QSOP (0.154", 3.90mm), SSOP (0.209", 5.30mm), and TSSOP (0.173", 4.40mm). All maintain identical pin pitch and electrical characteristics. Selection depends on available PCB real estate and design constraints.

Q: Why is the 74ACTQ573QSCX marked as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi. Texas Instruments continues production of functionally equivalent 74ACT573 variants, making these parts the recommended long-term solution for new designs and system maintenance.

Q: Are all substitute parts RoHS compliant?

A: Yes. SN74ACT573DBR, SN74ACT573PW, and SN74ACT573PWR all carry ROHS3 Compliant certification. The original 74ACTQ573QSCX RoHS status is not specified in available documentation.

Q: What is the propagation delay difference between the main part and substitutes?

A: The 74ACTQ573QSCX specifies 6.5ns propagation delay, while all Texas Instruments substitutes specify 6ns. This 0.5ns improvement does not affect functional compatibility and represents enhanced performance in the substitute parts.

Q: Which substitute should be selected for new designs?

A: SN74ACT573PWR is recommended for new designs due to Active product status, confirmed ROHS3 compliance, and superior inventory availability. The 20-TSSOP package is widely supported in modern PCB design tools and manufacturing processes.