74AC373SC D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74AC373SC 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 74AC373 series provides standardized latch functionality across multiple manufacturers and packaging options, enabling direct substitution based on electrical and mechanical compatibility.

Substiute Parts

74AC373SC

onsemiIn Stock: 189574AC373SC Datasheet

Current PartRFQ

MC74AC373DWG

onsemiIn Stock: 2053MC74AC373DWG Datasheet

DirectRFQ

SN74AC373DW

Texas InstrumentsIn Stock: 2420SN74AC373DW Datasheet

DirectRFQ

SN74AC373DWR

Texas InstrumentsIn Stock: 4416SN74AC373DWR Datasheet

DirectRFQ

SN74AC373MDWREP

Texas InstrumentsIn Stock: 746SN74AC373MDWREP Datasheet

UpgradeRFQ

CD74AC373M

Harris CorporationIn Stock: 1937CD74AC373M Datasheet

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CD74AC373M96

Texas InstrumentsIn Stock: 1905CD74AC373M96 Datasheet

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SN74AC373NSR

Texas InstrumentsIn Stock: 2896SN74AC373NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC373SC is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Voltage Supply Range: 2V ~ 6V (minimum requirement)
• Current Output: 24mA / 24mA
• Mounting Type: Surface Mount

Acceptable Variations:

• Propagation Delay Time: 7ns to 7.5ns (within standard tolerance)
• Operating Temperature: -40°C ~ 85°C or extended range (-55°C ~ 125°C)
• Packaging Format: Tube, Cut Tape (CT), Digi-Reel®, or Tape & Reel (TR)
• Product Status: Active or Obsolete (both acceptable for substitution)
• RoHS Compliance: ROHS3 Compliant preferred; RoHS non-compliant acceptable for legacy applications

Non-Substitutable Variants:

• Different package types (e.g., 20-SO with 0.209" width) are not direct substitutes
• Voltage supply ranges below 2V are not acceptable
• Different circuit configurations or output types

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Recommended Priority):

1. SN74AC373DWR (Texas Instruments) - Active product status with ROHS3 compliance. Identical electrical specifications to 74AC373SC with 7.5ns propagation delay. Available in Cut Tape (CT) & Digi-Reel® packaging with 4365 units in stock.

2. MC74AC373DWG (onsemi) - Active product status with ROHS3 compliance. Maintains onsemi manufacturer continuity with 7.5ns propagation delay. Available in Tube packaging with 2028 units in stock.

3. SN74AC373MDWREP (Texas Instruments) - Active product status with extended operating temperature range (-55°C ~ 125°C). Provides thermal margin for demanding applications. Available in Tape & Reel (TR) packaging with 655 units in stock.

Alternative Substitutes (Extended Performance):

4. CD74AC373M96 (Texas Instruments) - Active product status with ROHS3 compliance. Offers superior propagation delay (3ns) and extended operating temperature range (-55°C ~ 125°C). Voltage supply range 1.5V ~ 5.5V provides broader compatibility. Available in Cut Tape (CT) packaging with 1844 units in stock.

Legacy Compatibility (Not Recommended for New Designs):

• SN74AC373DW - Discontinued at DiGi Electronics; use only for legacy system maintenance
• CD74AC373M - Obsolete with RoHS non-compliance; avoid for new applications

Frequently Asked Questions (FAQ)

Q: Can SN74AC373NSR substitute for 74AC373SC?

A: No. SN74AC373NSR uses a different package type (20-SO with 0.209" width) compared to the 74AC373SC (20-SOIC with 0.295" width). Package dimensions are not interchangeable on PCB layouts.

Q: What is the difference between MC74AC373DWG and SN74AC373DWR?

A: Both are direct substitutes with identical electrical specifications (2V ~ 6V supply, 7.5ns propagation delay, -40°C ~ 85°C operating range). The primary difference is manufacturer (onsemi vs. Texas Instruments) and packaging format (Tube vs. Cut Tape & Digi-Reel®). Selection depends on procurement preference and packaging requirements.

Q: Is SN74AC373MDWREP suitable for high-temperature applications?

A: Yes. SN74AC373MDWREP extends the operating temperature range to -55°C ~ 125°C, compared to the standard -40°C ~ 85°C range of 74AC373SC. This makes it suitable for industrial and automotive applications requiring thermal margin.

Q: Can CD74AC373M96 replace 74AC373SC in all applications?

A: CD74AC373M96 is electrically compatible with superior performance (3ns propagation delay vs. 7ns). However, the voltage supply range is 1.5V ~ 5.5V instead of 2V ~ 6V. Verify that your application operates within the 1.5V ~ 5.5V window before substitution.

Q: What is the impact of propagation delay differences (7ns vs. 7.5ns vs. 3ns)?

A: Propagation delay affects signal timing in latch circuits. The 74AC373SC specifies 7ns; substitutes with 7.5ns introduce minimal timing variation. CD74AC373M96 with 3ns provides faster response but may require timing analysis in critical applications. For most standard logic applications, these differences are negligible.

Q: Are all substitute parts RoHS compliant?

A: Most active substitutes (SN74AC373DWR, MC74AC373DWG, SN74AC373MDWREP, CD74AC373M96) are ROHS3 compliant. CD74AC373M (obsolete) is RoHS non-compliant. For new designs, select ROHS3 compliant parts to meet regulatory requirements.

Q: What packaging formats are available for substitutes?

A: Substitutes are available in Tube, Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) formats. Selection depends on assembly process requirements and order quantities. All maintain the same 20-SOIC (0.295", 7.50mm Width) footprint for PCB compatibility.