74F373MSAX Equivalent & Substitute Parts

Part Overview

The 74F373MSAX 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, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates within the 74F logic series standard, maintaining compatibility with systems requiring this specific logic family performance characteristics.

Substiute Parts

74F373MSAX

onsemiIn Stock: 240974F373MSAX Datasheet

Current PartRFQ

SN74F373DBR

Texas InstrumentsIn Stock: 3183SN74F373DBR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F373MSAX is determined by strict alignment with the following critical parameters:

• Logic Family & Function: D-Type Transparent Latch with 8:8 circuit configuration and tri-state output
• Electrical Specifications: Supply voltage range 4.5V ~ 5.5V, output current ratings 3mA (high) and 24mA (low)
• Package Compatibility: 20-SSOP surface mount package with identical physical dimensions
• Operating Environment: Temperature range 0°C ~ 70°C and MSL rating 1 (Unlimited)

The SN74F373DBR from Texas Instruments meets all substitution criteria, maintaining functional equivalence across electrical, mechanical, and environmental parameters while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74F373DBR from Texas Instruments is the direct functional equivalent for the obsolete 74F373MSAX. Selection of this substitute is based on:

• Functional Equivalence: Identical logic type, circuit configuration, output type, and electrical specifications
• Package Compatibility: Identical 20-SSOP surface mount package enabling direct PCB layout compatibility
• Product Status: Active manufacturing status ensures long-term availability and supply chain reliability
• Regulatory Compliance: ROHS3 compliance status meets current environmental and regulatory requirements
• Electrical Performance: Propagation delay variance (8.6ns vs 5.3ns) remains within acceptable operational parameters for 74F logic family applications

Frequently Asked Questions (FAQ)

Q: Can the SN74F373DBR be used as a direct replacement for the 74F373MSAX?

A: Yes. Both parts share identical logic function, electrical specifications, package type, and mounting configuration. Direct substitution is supported without circuit modification.

Q: What is the significance of the propagation delay difference (5.3ns vs 8.6ns)?

A: The SN74F373DBR exhibits a longer propagation delay. This difference must be evaluated against system timing requirements. For most 74F logic applications, this variance remains within acceptable operational margins.

Q: Are there any packaging or PCB layout considerations?

A: No. Both parts use the 20-SSOP surface mount package with identical physical dimensions (0.209", 5.30mm width). PCB footprints and assembly processes remain unchanged.

Q: Why is the 74F373MSAX classified as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. The SN74F373DBR from Texas Instruments remains in active production, providing continued component availability.

Q: Does the RoHS3 compliance of the SN74F373DBR affect compatibility?

A: No. RoHS3 compliance is an environmental and regulatory attribute that does not impact electrical or functional compatibility. It indicates the substitute meets current environmental standards.

Q: What supply voltage range is supported?

A: Both the 74F373MSAX and SN74F373DBR operate within 4.5V to 5.5V supply voltage range. This specification must be maintained in system design.

Q: Are moisture sensitivity considerations different between the two parts?

A: No. Both parts carry MSL rating 1 (Unlimited), indicating identical moisture sensitivity handling requirements during storage and assembly.