SN74LS373DW Equivalent & Substitute Parts

Part Overview

The SN74LS373DW is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output capability in a 20-SOIC surface mount package. This component is classified as discontinued at DiGi Electronics, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity. The part operates within a 4.75V to 5.25V supply voltage range and is suitable for applications requiring transparent latch functionality with independent circuit isolation.

Substiute Parts

SN74LS373DW

Texas InstrumentsIn Stock: 1919SN74LS373DW Datasheet

Current PartRFQ

SN74LS373DWR

Texas InstrumentsIn Stock: 15409SN74LS373DWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS373DW is determined by strict equivalence across the following critical parameters:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Package / Case: 20-SOIC
• Voltage - Supply: 4.75V ~ 5.25V
• Propagation Delay: 12ns
• Output Current Specifications: 2.6mA (High), 24mA (Low)
• Operating Temperature Range: 0°C ~ 70°C
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant

The SN74LS373DWR qualifies as a direct substitute based on identical electrical characteristics, functional specifications, and package geometry. The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS373DWR is the appropriate substitute for the discontinued SN74LS373DW. Both components maintain identical electrical performance, functional specifications, and physical package dimensions. The SN74LS373DWR carries active product status with higher inventory availability, ensuring supply chain continuity.

Both parts satisfy ROHS3 compliance requirements and REACH regulatory status, making them suitable for applications subject to environmental and hazardous substance restrictions. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints during storage or handling.

The substitution is electrically and mechanically transparent, requiring no circuit redesign or PCB layout modification. The primary consideration is packaging format: the SN74LS373DWR is supplied in Tape & Reel format, which is standard for production volume applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS373DWR replace the SN74LS373DW in existing designs?

A: Yes. The SN74LS373DWR is electrically and mechanically equivalent. All electrical parameters, package dimensions, and pin configurations are identical. No circuit or PCB modifications are required.

Q: What is the difference between these two part numbers?

A: The primary difference is product status and packaging format. The SN74LS373DW is discontinued, while the SN74LS373DWR is active. The SN74LS373DWR is supplied in Tape & Reel packaging, which is standard for production quantities.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings. Regulatory and environmental compliance is equivalent.

Q: What is the propagation delay specification, and does it affect substitution?

A: Both parts specify 12ns propagation delay. This timing parameter is identical and does not create any substitution constraints.

Q: Can I use the SN74LS373DWR for low-volume or prototype applications?

A: Yes. While the SN74LS373DWR is supplied in Tape & Reel format, it can be used for any application volume. Tape & Reel packaging is compatible with both automated assembly and manual placement.

Q: What are the output current specifications, and are they critical for substitution?

A: Output current specifications are 2.6mA (High) and 24mA (Low) for both parts. These specifications are identical and do not affect substitution eligibility.

Q: Does the 20-SOIC package dimension remain the same?

A: Yes. Both parts use the 20-SOIC package with identical dimensions of 0.295" × 7.50mm width. PCB footprints and assembly processes are unchanged.