74ACT373MSA Equivalent & Substitute Parts

Part Overview

The 74ACT373MSA is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output capability. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SSOP surface mount package with a 5.30mm width specification.

Substiute Parts

74ACT373MSA

onsemiIn Stock: 81974ACT373MSA Datasheet

Current PartRFQ

SN74ACT373DBR

Texas InstrumentsIn Stock: 3121SN74ACT373DBR Datasheet

DirectRFQ

SN74ACT373PW

Texas InstrumentsIn Stock: 1562SN74ACT373PW Datasheet

SimilarRFQ

SN74ACT373PWR

Texas InstrumentsIn Stock: 3359SN74ACT373PWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT373MSA are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Compatibility Criteria:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Voltage - Supply: 4.5V ~ 5.5V
• Independent Circuits: 1
• Current - Output High, Low: 24mA, 24mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Base Product Number: 74ACT373

Package Considerations: Substitute parts are grouped into two package variants: 20-SSOP (0.209", 5.30mm Width) and 20-TSSOP (0.173", 4.40mm Width). Both package types maintain electrical equivalence while differing in physical dimensions. The 20-SSOP variant provides direct mechanical compatibility with the original part, while 20-TSSOP variants require PCB layout verification due to reduced package width.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT373DBR (Texas Instruments) - Recommended Primary Substitute

The SN74ACT373DBR is the optimal substitute for the 74ACT373MSA. This part maintains identical package dimensions (20-SSOP, 0.209", 5.30mm Width), ensuring direct mechanical compatibility without PCB layout modifications. The SN74ACT373DBR carries Active product status with ROHS3 compliance certification, providing long-term availability and regulatory alignment. Propagation delay specification of 8.5ns is within acceptable tolerance relative to the original 8ns specification.

SN74ACT373PWR (Texas Instruments) - Secondary Substitute

The SN74ACT373PWR is an Active product with ROHS3 compliance and equivalent electrical specifications. This part uses a 20-TSSOP package (0.173", 4.40mm Width), which differs from the original 20-SSOP package. Selection of this substitute requires verification that PCB layout accommodates the reduced package width. Tape & Reel packaging provides suitability for production environments.

SN74ACT373PW (Texas Instruments) - Limited Availability Substitute

The SN74ACT373PW carries Discontinued at DiGi Electronics status, indicating restricted procurement channels. While electrically equivalent and ROHS3 compliant, this part is not recommended for new designs or ongoing procurement due to availability constraints. The 20-TSSOP package requires PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT373DBR directly replace the 74ACT373MSA without PCB modifications?

A: Yes. Both parts use the 20-SSOP package with identical dimensions (0.209", 5.30mm Width). Pin configuration and electrical specifications are compatible, allowing direct substitution without PCB layout changes.

Q: What is the significance of the propagation delay difference between 8ns and 8.5ns?

A: The 0.5ns difference falls within standard manufacturing tolerances for logic ICs in this family. Both specifications meet the same timing requirements for D-Type Transparent Latch applications operating at standard logic frequencies.

Q: Are the 20-SSOP and 20-TSSOP packages interchangeable?

A: No. The 20-TSSOP package is narrower (0.173", 4.40mm Width) compared to the 20-SSOP package (0.209", 5.30mm Width). While pin counts and electrical specifications are identical, PCB footprints differ. Substitution requires PCB layout verification and potential redesign.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. This certification is required for many industrial and consumer applications.

Q: Why is the 74ACT373MSA listed as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. Active substitutes from Texas Instruments ensure continued availability and support for designs using this logic function.

Q: Is the MSL rating of 1 (Unlimited) important for component handling?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. This simplifies storage and handling procedures compared to higher MSL ratings, reducing preparation time before assembly.

Q: Can I use these substitutes in designs requiring REACH compliance?

A: Yes. All substitute parts carry REACH Unaffected status, indicating compliance with REACH regulations. The original 74ACT373MSA also maintains REACH Unaffected status.