SN74AC573DW Equivalent & Substitute Parts

Part Overview

The SN74AC573DW is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This 20-SOIC surface mount device operates across a 2V to 6V supply voltage range with 2.5ns propagation delay and 24mA output drive capability. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs.

Substiute Parts

SN74AC573DW

Texas InstrumentsIn Stock: 3219SN74AC573DW Datasheet

Current PartRFQ

SN74AC573DWR

Texas InstrumentsIn Stock: 6012SN74AC573DWR Datasheet

DirectRFQ

MC74AC573DWR2G

onsemiIn Stock: 1952MC74AC573DWR2G Datasheet

DirectRFQ

MC74AC573DWG

onsemiIn Stock: 3269MC74AC573DWG Datasheet

MFR RecommendedRFQ

SN74AC533DW

Texas InstrumentsIn Stock: 1114SN74AC533DW Datasheet

Parametric EquivalentRFQ

SN74AC573DWG4

Texas InstrumentsIn Stock: 965SN74AC573DWG4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AC573DW is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Voltage - Supply: 2V ~ 6V
• Operating Temperature: -40°C ~ 85°C
• Independent Circuits: 1

Allowable Variation Parameters:

• Delay Time - Propagation: Up to 10ns (SN74AC573DW baseline is 2.5ns)
• Current - Output High, Low: Must match 24mA, 24mA
• Moisture Sensitivity Level (MSL): Acceptable up to MSL 3 (168 Hours)
• Packaging Format: Tube, Cut Tape (CT) & Digi-Reel®, or Tape & Reel (TR)
• Manufacturer: Texas Instruments or onsemi (74AC series compatibility)

Substitute parts are categorized as follows:

Direct Manufacturer Equivalents: Parts with identical electrical specifications and packaging, differing only in packaging format or product status.

Manufacturer Recommended Equivalents: Parts designated by the original manufacturer as direct functional replacements with acceptable parameter variations.

Parametric Equivalents: Parts meeting all mandatory parameters with minor variations in propagation delay or moisture sensitivity, suitable for applications where these variations fall within design tolerance.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74AC573DWR

The SN74AC573DWR is the optimal substitute for the SN74AC573DW. Both parts are manufactured by Texas Instruments with identical electrical specifications, including 2.5ns propagation delay and MSL 1 rating. The SN74AC573DWR maintains active product status with 5978 units in stock, ensuring supply continuity. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube), which does not affect electrical performance or board-level compatibility.

Secondary Recommendation: MC74AC573DWG

The MC74AC573DWG, manufactured by onsemi, provides a functionally equivalent alternative with active product status and 3258 units available. This part meets all mandatory parameters with acceptable propagation delay variation (10ns versus 2.5ns baseline). The MSL 3 rating requires controlled storage conditions (168 hours at 85°C/85% RH) compared to the unlimited MSL 1 rating of the original part. Tube packaging matches the original SN74AC573DW format.

Tertiary Recommendation: MC74AC573DWR2G

The MC74AC573DWR2G offers equivalent functionality with active status and 1900 units in stock. This onsemi part accepts the same 10ns propagation delay and MSL 3 moisture sensitivity as the MC74AC573DWG. Tape & Reel packaging may require format conversion for assembly processes designed for tube or cut tape formats.

Alternative Consideration: SN74AC533DW

The SN74AC533DW is a parametric equivalent with superior propagation delay performance (2ns versus 2.5ns baseline) and active product status. This Texas Instruments part maintains MSL 1 unlimited rating and tube packaging. The base product number differs (74AC533 versus 74AC573), indicating a distinct device variant within the 74AC logic family. Functional compatibility must be verified against specific application requirements before selection.

Discontinued Parts: SN74AC573DWG4

The SN74AC573DWG4 shares identical specifications with the original SN74AC573DW but carries discontinued status at DiGi Electronics. With only 929 units in inventory, this part is not recommended for new designs or production replenishment.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AC573DWR as a direct replacement for SN74AC573DW?

A: Yes. The SN74AC573DWR is electrically identical to the SN74AC573DW with matching propagation delay (2.5ns), output current (24mA), supply voltage range (2V–6V), and MSL rating (1). The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube). Both are surface mount 20-SOIC devices with identical pinouts and performance characteristics.

Q: What is the impact of 10ns propagation delay in the onsemi parts versus 2.5ns in the original?

A: The onsemi MC74AC573DWR2G and MC74AC573DWG have 10ns propagation delay compared to 2.5ns in the SN74AC573DW. This 7.5ns difference represents the time required for output changes to respond to input transitions. Applications with strict timing requirements or high-frequency operation must verify that 10ns delay remains within design specifications. Low-frequency or non-time-critical applications typically accommodate this variation without functional impact.

Q: What does MSL 3 (168 Hours) mean compared to MSL 1 (Unlimited)?

A: MSL 1 (Unlimited) indicates the component can be stored indefinitely at room temperature without moisture absorption concerns. MSL 3 (168 Hours) specifies that the component must be used within 168 hours (7 days) after exposure to 85°C and 85% relative humidity conditions. onsemi parts require controlled storage and handling procedures to prevent moisture-induced defects during assembly. This impacts supply chain logistics and manufacturing scheduling.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts—SN74AC573DWR, MC74AC573DWR2G, MC74AC573DWG, SN74AC533DW, and SN74AC573DWG4—carry ROHS3 Compliant certification, matching the original SN74AC573DW. All parts are REACH Unaffected and classified under ECCN EAR99.

Q: Can I mix packaging formats in production?

A: Packaging format (Tube, Cut Tape & Digi-Reel®, or Tape & Reel) affects assembly line compatibility and handling procedures but does not impact electrical performance. Mixing formats requires process validation to ensure pick-and-place equipment, tape feeders, and handling systems accommodate each format. Standardizing on a single packaging format per production run minimizes process complexity.

Q: Why is SN74AC533DW listed as a parametric equivalent rather than a direct substitute?

A: The SN74AC533DW uses a different base product number (74AC533 versus 74AC573), indicating a distinct device variant within the 74AC logic family. While it meets all mandatory electrical and mechanical parameters, the functional differences between 74AC533 and 74AC573 variants require application-specific verification before substitution. Consult device datasheets to confirm pinout and functional compatibility.

Q: Which part should I select for new designs?

A: For new designs, select SN74AC573DWR (Texas Instruments, active status, 5978 units in stock) as the primary choice. This part maintains identical specifications to the original SN74AC573DW with assured long-term availability. If onsemi sourcing is preferred, MC74AC573DWG provides equivalent functionality with active status and larger inventory (3258 units), accepting the MSL 3 storage requirement and 10ns propagation delay variation.