74ACT573TTR Equivalent & Substitute Parts

Part Overview

The 74ACT573TTR is a D-Type Transparent Latch logic integrated circuit manufactured by STMicroelectronics. This component functions as a single-channel 8:8 transparent latch with tri-state output capability, designed for digital logic applications requiring data latching and output control. The device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement requirements. Substitute parts must maintain functional compatibility through matching electrical specifications, package form factor, and operational parameters.

Substiute Parts

74ACT573TTR

STMicroelectronicsIn Stock: 109474ACT573TTR Datasheet

Current PartRFQ

MC74ACT573DTR2G

onsemiIn Stock: 3144MC74ACT573DTR2G Datasheet

SimilarRFQ

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 74ACT573TTR is determined by the following critical parameters:

Primary Compatibility Criteria:

• Logic Type: D-Type Transparent Latch
• Output Type: Tri-State
• Supply Voltage Range: 4.5V ~ 5.5V
• Package Type: 20-TSSOP form factor
• Output Current Capability: 24mA minimum (both high and low)
• Mounting Type: Surface Mount
• Independent Circuits: 1 channel
• RoHS3 Compliance and MSL Level 1 rating

Secondary Consideration:

• Circuit Configuration (8:8 preferred for direct pin-compatible substitution)
• Propagation Delay Time (5ns to 10.5ns acceptable range)
• Operating Temperature Range (extended or standard grade)

All identified substitute parts maintain the 74ACT series base product designation and share the 20-TSSOP package footprint, ensuring mechanical and electrical compatibility within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74ACT573PWR (Texas Instruments)

The SN74ACT573PWR is the recommended primary substitute for the 74ACT573TTR. This component maintains identical circuit configuration (8:8), matching output current specifications (24mA/24mA), and equivalent propagation delay performance (6ns). The device carries Active product status with current manufacturing availability. Texas Instruments maintains full ROHS3 compliance and MSL Level 1 rating. The Cut Tape and Digi-Reel packaging format provides flexible procurement options for production environments.

Secondary Substitute: SN74ACT573PW (Texas Instruments)

The SN74ACT573PW provides functional equivalence with identical 8:8 circuit configuration and electrical parameters (6ns propagation delay, 24mA output current). This component is listed as Discontinued at DiGi Electronics but remains available through alternative distribution channels. Tube packaging format suits lower-volume applications. Full ROHS3 and MSL Level 1 compliance is maintained.

Alternative Substitute: MC74ACT573DTR2G (onsemi)

The MC74ACT573DTR2G from onsemi is functionally compatible with the 74ACT573TTR across all critical electrical parameters. The device maintains 4.5V ~ 5.5V supply voltage, 24mA output current capability, and tri-state output configuration. The circuit configuration differs at 1:8 versus the original 8:8 specification. Propagation delay extends to 10.5ns, and operating temperature range is limited to -40°C ~ 85°C. This component carries Active product status with Tape & Reel packaging. Selection of this substitute requires confirmation that the 1:8 circuit configuration and extended propagation delay are acceptable for the target application.

Compliance and Certification:

All substitute components maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. REACH compliance status is unaffected across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can the MC74ACT573DTR2G be used as a direct replacement for the 74ACT573TTR?

A: The MC74ACT573DTR2G maintains electrical compatibility across supply voltage, output current, and tri-state output specifications. However, the circuit configuration differs (1:8 versus 8:8). This difference affects pin functionality and signal routing. Substitution is permissible only when the 1:8 configuration aligns with circuit design requirements. The extended propagation delay (10.5ns versus 5ns) must also be evaluated against timing-critical applications.

Q: What is the difference between the packaging formats offered by the substitute parts?

A: The 74ACT573TTR is supplied in Tape & Reel (TR) format. Substitute parts are available in three packaging formats: Tape & Reel (TR) via MC74ACT573DTR2G, Tube via SN74ACT573PW, and Cut Tape with Digi-Reel via SN74ACT573PWR. All formats use the identical 20-TSSOP physical package. Selection depends on procurement volume and assembly line requirements. Tape & Reel and Cut Tape formats support automated pick-and-place assembly, while Tube format suits manual or lower-volume handling.

Q: Are all substitute parts RoHS compliant?

A: All identified substitute components (SN74ACT573PWR, SN74ACT573PW, and MC74ACT573DTR2G) maintain ROHS3 compliance status. The original 74ACT573TTR is also ROHS3 compliant. This ensures compatibility with environmental regulations and manufacturing standards across all alternatives.

Q: What is the significance of the MSL Level 1 rating?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture-related degradation concerns. All substitute parts carry this rating, matching the original component. This eliminates moisture-related risk factors during storage, handling, and assembly processes.

Q: Which substitute offers the best propagation delay performance?

A: The 74ACT573TTR provides the fastest propagation delay at 5ns. Among substitutes, the SN74ACT573PWR and SN74ACT573PW both deliver 6ns propagation delay, representing a 1ns increase. The MC74ACT573DTR2G extends to 10.5ns. For timing-critical applications, the Texas Instruments alternatives (SN74ACT573PWR or SN74ACT573PW) provide performance closest to the original specification.

Q: What is the operating temperature range difference between substitutes?

A: The 74ACT573TTR operates across -55°C ~ 125°C (extended military grade). All substitute parts operate within -40°C ~ 85°C (commercial grade). Applications requiring extended temperature operation below -40°C or above 85°C cannot use the identified substitutes. Standard commercial temperature range applications are fully supported by all alternatives.

Q: Is the 20-TSSOP package footprint identical across all parts?

A: All parts, including the original 74ACT573TTR and all substitutes, use the 20-TSSOP package with 0.173" width and 4.40mm physical dimensions. PCB footprints and land patterns are mechanically and electrically compatible across all components. No layout modifications are required for package substitution.