74ACTQ373SCX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACTQ373SCX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output in a 20-SOIC package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates within a 4.5V to 5.5V supply voltage range with a propagation delay of 6.5ns and supports output currents of 24mA for both high and low states.

Substiute Parts

74ACTQ373SCX

onsemiIn Stock: 1220474ACTQ373SCX Datasheet

Current PartRFQ

MC74ACT373DWG

onsemiIn Stock: 1404MC74ACT373DWG Datasheet

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MC74ACT373DWR2G

onsemiIn Stock: 3755MC74ACT373DWR2G Datasheet

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CD74ACT373M96

Texas InstrumentsIn Stock: 3009CD74ACT373M96 Datasheet

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SN74ACT373DW

Texas InstrumentsIn Stock: 1749SN74ACT373DW Datasheet

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SN74ACT373DWR

Texas InstrumentsIn Stock: 5468SN74ACT373DWR Datasheet

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SN74ACT373MDWREP

Texas InstrumentsIn Stock: 793SN74ACT373MDWREP Datasheet

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SN74ACT373NSR

Texas InstrumentsIn Stock: 2171SN74ACT373NSR Datasheet

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SN74ACT563DWR

Texas InstrumentsIn Stock: 3766SN74ACT563DWR Datasheet

Parametric EquivalentRFQ

SN74ACT573DWR

Texas InstrumentsIn Stock: 14076SN74ACT573DWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACTQ373SCX is determined by the following critical parameters:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Voltage Supply Range: 4.5V ~ 5.5V
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Output Current Capability: 24mA (High and Low)

Substitute parts are grouped into two categories:

Direct Substitutes (Same Base Product Number - 74ACT373): Parts with identical functional specifications, circuit configuration, and package format. These include MC74ACT373DWG, MC74ACT373DWR2G, SN74ACT373DW, SN74ACT373DWR, SN74ACT373MDWREP, and CD74ACT373M96. Differences exist in product status, packaging format (Tube, Tape & Reel, Cut Tape), and operating temperature ranges.

Parametric Equivalents (Alternative Base Product Numbers - 74ACT563, 74ACT573): Parts with identical electrical performance and package format but different internal latch configurations. These include SN74ACT563DWR and SN74ACT573DWR. These parts maintain the same supply voltage, output current, and physical package specifications while offering alternative circuit topologies.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Base Product 74ACT373):

SN74ACT373DWR and SN74ACT373MDWREP are the primary active alternatives. SN74ACT373DWR maintains the original -40°C to 85°C operating temperature range with MSL 1 rating and is available in Cut Tape & Digi-Reel packaging. SN74ACT373MDWREP extends the operating temperature to -55°C to 125°C, also with MSL 1 rating, suitable for industrial and extended-temperature applications.

MC74ACT373DWR2G and MC74ACT373DWG from onsemi provide active product status alternatives with identical electrical specifications. MC74ACT373DWR2G is available in Tape & Reel format with 3689 units in stock, while MC74ACT373DWG is available in Tube packaging with 1352 units in stock. Both carry MSL 3 rating (168 Hours).

CD74ACT373M96 from Texas Instruments offers superior performance with 3ns propagation delay and extended operating temperature range (-55°C to 125°C), maintaining MSL 1 rating. This part is suitable for applications requiring faster response times and wider temperature operation.

For Parametric Equivalents (Alternative Base Products):

SN74ACT563DWR and SN74ACT573DWR provide functionally equivalent alternatives with different internal latch configurations. Both maintain identical supply voltage, output current, and package specifications. SN74ACT573DWR offers the highest inventory availability (14,058 units) with 6ns propagation delay. SN74ACT563DWR provides 6.5ns propagation delay matching the original part specification.

Package Consideration:

SN74ACT373NSR uses a 20-SO package (0.209" width) instead of the standard 20-SOIC (0.295" width). This narrower package may require PCB layout modifications and is suitable only for applications where physical space constraints justify the package change.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the 74ACTQ373SCX?

A: Parts with the same base product number (74ACT373) are direct functional replacements. SN74ACT373DWR, SN74ACT373MDWREP, MC74ACT373DWR2G, and MC74ACT373DWG all maintain identical logic type, circuit configuration, output type, supply voltage, and output current specifications. Verify packaging format compatibility with your PCB design.

Q: What is the difference between the onsemi and Texas Instruments versions?

A: Both manufacturers produce 74ACT373 logic latches with identical electrical specifications. The primary differences are product status, packaging options, and moisture sensitivity levels. onsemi parts (MC74ACT373DWG, MC74ACT373DWR2G) carry MSL 3 rating, while Texas Instruments parts (SN74ACT373DWR, SN74ACT373MDWREP) carry MSL 1 rating.

Q: Are the parametric equivalents (74ACT563, 74ACT573) truly interchangeable?

A: SN74ACT563DWR and SN74ACT573DWR are parametric equivalents with identical electrical performance and package format. They differ in internal latch configuration and base product number. Verify your circuit design does not depend on specific latch topology before substitution.

Q: Why does CD74ACT373M96 have faster propagation delay (3ns vs 6.5ns)?

A: Propagation delay variation reflects manufacturing process differences between onsemi and Texas Instruments. CD74ACT373M96 meets the same functional specification but with improved timing performance. This faster response is compatible with the original design and may improve system performance.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture absorption during storage and handling. MSL 1 (Unlimited) allows indefinite shelf life under controlled conditions. MSL 3 (168 Hours) requires specific storage conditions and limits shelf life. For long-term inventory, MSL 1 rated parts are preferred.

Q: Can I use SN74ACT373NSR with its different package size?

A: SN74ACT373NSR uses a 20-SO package (0.209" width) versus the standard 20-SOIC (0.295" width). While electrically identical, the narrower package requires different PCB footprint and may not be compatible with existing board designs without layout modifications.

Q: Which substitute offers the best availability?

A: SN74ACT573DWR provides the highest inventory availability with 14,058 units in stock. SN74ACT373DWR offers 5,390 units, and MC74ACT373DWR2G offers 3,689 units. Inventory levels should be verified with your supplier for current availability.