74ACT373SC D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACT373SC 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 equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74ACT373 series maintains consistent functional characteristics across multiple manufacturers and packaging options, enabling direct substitution based on electrical and mechanical parameter alignment.

Substiute Parts

74ACT373SC

onsemiIn Stock: 356974ACT373SC Datasheet

Current PartRFQ

MC74ACT373DWG

onsemiIn Stock: 1404MC74ACT373DWG Datasheet

DirectRFQ

MC74ACT373DWR2G

onsemiIn Stock: 3755MC74ACT373DWR2G Datasheet

SimilarRFQ

SN74ACT373DW

Texas InstrumentsIn Stock: 1749SN74ACT373DW Datasheet

DirectRFQ

SN74ACT373DWR

Texas InstrumentsIn Stock: 5468SN74ACT373DWR Datasheet

DirectRFQ

SN74ACT373MDWREP

Texas InstrumentsIn Stock: 793SN74ACT373MDWREP Datasheet

UpgradeRFQ

CD74ACT373M96

Texas InstrumentsIn Stock: 3009CD74ACT373M96 Datasheet

SimilarRFQ

SN74ACT373NSR

Texas InstrumentsIn Stock: 2171SN74ACT373NSR Datasheet

SimilarRFQ

SN74ACT563DW

Texas InstrumentsIn Stock: 1647SN74ACT563DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT373SC is determined by the following critical parameters:

Primary Substitution Criteria:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Supply Voltage Range: 4.5V ~ 5.5V
• Independent Circuits: 1
• Package Type: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Secondary Compatibility Factors:

• Propagation Delay: 8ns to 8.5ns (acceptable variance)
• Output Current: 24mA / 24mA (must match)
• Operating Temperature: -40°C ~ 85°C (standard grade) or -55°C ~ 125°C (extended grade)
• Moisture Sensitivity Level: 1 or 3 (both acceptable for surface mount applications)

Substitute parts are grouped into three categories: Direct Equivalents (identical packaging and specifications), Similar Parts (same electrical function with packaging variations), and Parametric Equivalents (alternative base numbers with compatible electrical characteristics).

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Preferred for Pin-Compatible Replacement):

MC74ACT373DWG and MC74ACT373DWR2G are active onsemi products maintaining identical electrical specifications to the obsolete 74ACT373SC. Both feature 8.5ns propagation delay and 20-SOIC packaging. MC74ACT373DWR2G in Tape & Reel format is recommended for high-volume procurement. MSL rating of 3 requires standard moisture control during assembly.

SN74ACT373DWR (Texas Instruments, Active) provides direct electrical equivalence with 8.5ns propagation delay and MSL 1 rating, eliminating moisture sensitivity concerns. This part is actively produced and widely available through distribution channels.

Extended Temperature Grade Alternative:

SN74ACT373MDWREP extends operating temperature to -55°C ~ 125°C while maintaining 8.5ns propagation delay and MSL 1 rating. This upgrade option is suitable for applications requiring military or automotive temperature specifications without functional modification.

CD74ACT373M96 offers superior propagation delay performance (3ns) with extended temperature range (-55°C ~ 125°C) and MSL 1 rating. Selection of this part requires verification that faster switching characteristics do not introduce timing conflicts in the target circuit.

Package Variant Consideration:

SN74ACT373NSR uses 20-SO package (0.209", 5.30mm width) instead of standard 20-SOIC (0.295", 7.50mm width). This narrower package requires PCB layout modification and is not recommended as a direct drop-in replacement.

Parametric Equivalent (Different Base Number):

SN74ACT563DW represents a parametric equivalent with different base number (74ACT563 vs. 74ACT373). Faster propagation delay (6.5ns) and Last Time Buy status limit its suitability for new designs. Functional compatibility requires circuit-level verification.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT373DWG directly replace 74ACT373SC without PCB modification?

A: Yes. Both parts use identical 20-SOIC (0.295", 7.50mm) package with matching pin configuration. Electrical specifications align within acceptable tolerances (8ns vs. 8.5ns propagation delay). MSL 3 rating requires standard moisture control during assembly and storage.

Q: What is the difference between SN74ACT373DW and SN74ACT373DWR?

A: Both are Texas Instruments 74ACT373 parts with identical electrical specifications. SN74ACT373DW uses Tube packaging; SN74ACT373DWR uses Cut Tape & Digi-Reel format. Selection depends on procurement volume and assembly line requirements. SN74ACT373DWR is currently active; SN74ACT373DW is discontinued at DiGi Electronics.

Q: Should I use SN74ACT373MDWREP or CD74ACT373M96 for extended temperature applications?

A: Both support -55°C ~ 125°C operating range. CD74ACT373M96 provides faster propagation delay (3ns vs. 8.5ns), which may introduce timing changes in the circuit. SN74ACT373MDWREP maintains 8.5ns delay, matching original 74ACT373SC performance. Select based on timing margin requirements in your application.

Q: Is SN74ACT373NSR compatible with 74ACT373SC?

A: Electrical specifications are compatible, but package dimensions differ. SN74ACT373NSR uses narrower 20-SO (0.209", 5.30mm) versus standard 20-SOIC (0.295", 7.50mm). PCB layout modification is required; direct drop-in replacement is not possible.

Q: What does MSL 1 versus MSL 3 mean for component handling?

A: MSL 1 (Unlimited) allows indefinite shelf storage without moisture bake-out. MSL 3 (168 Hours) requires moisture bake-out if storage exceeds 168 hours in standard conditions. MC74ACT373DWG and MC74ACT373DWR2G (MSL 3) require standard moisture control during assembly. Texas Instruments parts (MSL 1) eliminate this requirement.

Q: Can I use SN74ACT563DW as a substitute for 74ACT373SC?

A: SN74ACT563DW is a parametric equivalent with different base number and faster propagation delay (6.5ns). Functional compatibility requires circuit-level verification to confirm timing margins are not violated. Last Time Buy status limits long-term availability.

Q: Which substitute part has the best long-term availability?

A: SN74ACT373DWR (Texas Instruments, Active status) and MC74ACT373DWR2G (onsemi, Active status) are both actively produced with confirmed inventory levels. Both are recommended for new designs requiring sustained component supply.