74ACT373SJ D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACT373SJ is a D-Type Transparent Latch IC manufactured by onsemi, featuring an 8:8 channel configuration with tri-state output capability. This component is classified as obsolete, making equivalent and 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-SOP surface mount package. Substitute parts maintain functional equivalence while offering improved availability and active product status from alternative manufacturers.

Substiute Parts

74ACT373SJ

onsemiIn Stock: 85274ACT373SJ Datasheet

Current PartRFQ

SN74ACT373NSR

Texas InstrumentsIn Stock: 2171SN74ACT373NSR Datasheet

DirectRFQ

CD74ACT373M96

Texas InstrumentsIn Stock: 3009CD74ACT373M96 Datasheet

SimilarRFQ

SN74ACT373DW

Texas InstrumentsIn Stock: 1749SN74ACT373DW Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT373SJ is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Supply Voltage Range: 4.5V ~ 5.5V
• Output Current Capability: 24mA minimum (both high and low)
• Independent Circuits: 1
• Mounting Type: Surface Mount
• Package Family: 20-pin SOIC/SOP variants

All substitute parts listed maintain these core electrical specifications. Package width variations (0.209" vs 0.295") are permissible within the SOIC/SOP family, as both are standard surface mount footprints compatible with modern PCB assembly processes. Operating temperature range extensions in substitute parts do not restrict their use in applications requiring the base -40°C to 85°C range.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT373NSR (Texas Instruments) - Primary Substitute

The SN74ACT373NSR is the recommended primary substitute for the 74ACT373SJ. This part maintains identical electrical specifications including supply voltage, output current, and operating temperature range. The 8.5ns propagation delay is within acceptable tolerance of the original 8ns specification. The part is currently in active production status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The 20-SOIC (0.209", 5.30mm) package matches the original footprint exactly, eliminating PCB redesign requirements.

CD74ACT373M96 (Texas Instruments) - Extended Temperature Alternative

The CD74ACT373M96 provides functional equivalence with an extended operating temperature range of -55°C to 125°C, suitable for applications requiring enhanced thermal performance. The 3ns propagation delay represents improved timing performance. The 20-SOIC (0.295", 7.50mm) package requires PCB footprint verification but remains within standard SOIC family specifications. ROHS3 compliance and active product status support procurement continuity.

SN74ACT373DW (Texas Instruments) - Secondary Option

The SN74ACT373DW maintains full electrical equivalence with the original part and identical operating temperature specifications. Current availability is limited due to discontinuation at DiGi Electronics, making this option suitable only when primary substitutes are unavailable. The 20-SOIC (0.295", 7.50mm) package requires footprint compatibility assessment.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT373NSR be used as a direct replacement for the 74ACT373SJ without PCB modifications?

A: Yes. The SN74ACT373NSR maintains identical electrical specifications and uses the same 20-SOIC (0.209", 5.30mm) package footprint as the original 74ACT373SJ. No PCB layout changes are required.

Q: What is the significance of the propagation delay difference between the 74ACT373SJ (8ns) and CD74ACT373M96 (3ns)?

A: The CD74ACT373M96 exhibits faster signal propagation, which is beneficial for timing-critical applications. This represents improved performance and does not create compatibility issues in designs originally specified for 8ns delay.

Q: Are there package compatibility concerns when substituting the 74ACT373SJ with the CD74ACT373M96 or SN74ACT373DW?

A: Both the CD74ACT373M96 and SN74ACT373DW use the 20-SOIC (0.295", 7.50mm) package, which differs from the original 74ACT373SJ (0.209", 5.30mm) width. PCB footprint compatibility must be verified before implementation. Standard SOIC footprints typically accommodate both widths, but design documentation should be reviewed.

Q: What compliance certifications apply to these substitute parts?

A: All Texas Instruments substitute parts (SN74ACT373NSR, CD74ACT373M96, SN74ACT373DW) carry ROHS3 compliance certification and REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

Q: Why is the 74ACT373SJ classified as obsolete?

A: The 74ACT373SJ is an onsemi product that has reached end-of-life status. Texas Instruments maintains active production of functionally equivalent 74ACT373 variants, providing continuity for designs requiring this logic function.

Q: Can the extended temperature range of the CD74ACT373M96 (-55°C to 125°C) be used in applications only requiring -40°C to 85°C operation?

A: Yes. The CD74ACT373M96 is fully compatible with applications specifying the narrower -40°C to 85°C range. Extended temperature capability does not restrict use in standard temperature applications.