74AC373SCX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74AC373SCX is a D-Type Transparent Latch IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output in a 20-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74AC373 series provides a single-channel transparent latch function suitable for data storage and bus interface applications in digital logic circuits.

Key Parameters

Parameter	Value
Part Number	74AC373SCX
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 6V
Propagation Delay	7ns
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Package Type	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC373SCX is determined by the following critical parameters:

Primary Substitution Criteria:

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

Substitution Categories:

Direct Substitutes (Functionally Equivalent, Active Status): Parts meeting all primary criteria with active product status and identical or superior electrical performance.

Similar Substitutes (Compatible with Packaging Variations): Parts with identical logic function and electrical specifications but different packaging formats (Tube, Tape & Reel, Cut Tape).

Upgrade Substitutes (Enhanced Operating Range): Parts with extended temperature operating range (-55°C ~ 125°C) providing superior reliability in demanding environments.

Alternative Series Substitutes (Different Logic Series): Parts from alternative logic families (74AHC series) offering improved performance characteristics while maintaining functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Circuit	Output Type	Voltage Supply	Propagation Delay	Output Current (H/L)	Operating Temp	Package	Packaging Format
74AC373SCX	onsemi	Obsolete	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	—
MC74AC373DWR2G	onsemi	Active	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Tape & Reel
MC74AC373DWG	onsemi	Active	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Tube
SN74AC373DW	Texas Instruments	Discontinued at DiGi Electronics	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Tube
SN74AC373DWR	Texas Instruments	Active	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Cut Tape & Digi-Reel
SN74AC373MDWREP	Texas Instruments	Active	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7.5ns	24mA / 24mA	-55°C ~ 125°C	20-SOIC	Tape & Reel
74AHC373D,118	NXP USA Inc.	Active	D-Type Transparent Latch	8:8	Tri-State	2V ~ 5.5V	4ns	8mA / 8mA	-40°C ~ 125°C	20-SOIC	Bulk
CD74AC373M	Harris Corporation	Obsolete	D-Type Transparent Latch	8:8	Tri-State	1.5V ~ 5.5V	3ns	24mA / 24mA	-55°C ~ 125°C	20-SOIC	Tube
CD74AC373M96	Texas Instruments	Active	D-Type Transparent Latch	8:8	Tri-State	1.5V ~ 5.5V	3ns	24mA / 24mA	-55°C ~ 125°C	20-SOIC	Cut Tape
SN74AC373NSR	Texas Instruments	Active	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC (0.209", 5.30mm)	Tape & Reel

Engineering Selection Recommendations

Recommended Primary Substitutes (Direct Replacement):

MC74AC373DWR2G and SN74AC373DWR are the preferred direct substitutes for 74AC373SCX. Both parts maintain active product status, identical electrical specifications within acceptable tolerance (7.5ns propagation delay vs. 7ns), and full voltage/current compatibility. MC74AC373DWR2G is onsemi-sourced, maintaining original manufacturer continuity. SN74AC373DWR provides Texas Instruments sourcing with equivalent performance and higher inventory availability.

Recommended Upgrade Substitute:

SN74AC373MDWREP offers extended operating temperature range (-55°C ~ 125°C) compared to the original specification (-40°C ~ 85°C). This part is suitable for applications requiring enhanced thermal performance and is recommended for designs targeting military or industrial temperature environments. RoHS3 compliance and unlimited moisture sensitivity level provide additional reliability assurance.

Alternative Series Consideration:

74AHC373D,118 from NXP represents an alternative logic family with improved propagation delay (4ns) and extended temperature range (-40°C ~ 125°C). However, this part features reduced output current capability (8mA vs. 24mA) and narrower voltage supply range (2V ~ 5.5V). Selection of this alternative requires verification that application load requirements do not exceed 8mA output current specification.

Compliance and Certification Status:

MC74AC373DWR2G, SN74AC373DWR, and SN74AC373MDWREP all carry RoHS3 compliance certification. CD74AC373M96 provides the lowest propagation delay (3ns) with RoHS3 compliance and active product status, suitable for timing-critical applications. CD74AC373M (Harris Corporation) is obsolete and should not be selected for new designs despite superior electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Can SN74AC373NSR be used as a direct replacement for 74AC373SCX?

A: SN74AC373NSR is functionally compatible but features a different package width (0.209", 5.30mm vs. 0.295", 7.50mm). While the package type remains 20-SOIC, the reduced width may require PCB layout verification. Electrical specifications are identical, making this a viable substitute if physical package dimensions are acceptable for the application.

Q: What is the difference between MC74AC373DWR2G and MC74AC373DWG?

A: Both parts are onsemi-manufactured with identical electrical specifications. The primary difference is packaging format: MC74AC373DWR2G is supplied in Tape & Reel format suitable for automated assembly, while MC74AC373DWG is supplied in Tube format suitable for manual handling and lower-volume applications. Electrical performance is equivalent.

Q: Is 74AHC373D,118 a suitable replacement despite lower output current?

A: 74AHC373D,118 is functionally compatible only if the application load does not exceed 8mA per output. The original 74AC373SCX supports 24mA output current. Applications requiring higher drive capability must select alternatives maintaining 24mA output current specification (MC74AC373DWR2G, SN74AC373DWR, CD74AC373M96).

Q: Why is CD74AC373M listed as obsolete when it offers superior performance?

A: CD74AC373M (Harris Corporation) is classified as obsolete and carries RoHS non-compliant status. While electrical specifications are superior (3ns propagation delay, extended temperature range), obsolete status indicates discontinued manufacturing and limited availability. CD74AC373M96 (Texas Instruments) provides equivalent electrical performance with active product status and RoHS3 compliance, making it the preferred alternative.

Q: Can I use SN74AC373MDWREP in applications originally designed for 74AC373SCX?

A: Yes. SN74AC373MDWREP is fully compatible with identical electrical specifications and enhanced operating temperature range. The extended temperature capability (-55°C ~ 125°C vs. -40°C ~ 85°C) provides additional design margin. This part is recommended for applications requiring improved thermal performance or operating in extended temperature environments.

Q: What packaging format should I select for production assembly?

A: For automated surface-mount assembly, select Tape & Reel format (MC74AC373DWR2G or SN74AC373MDWREP). For manual assembly or lower-volume production, Tube format (MC74AC373DWG) is appropriate. Cut Tape format (SN74AC373DWR, CD74AC373M96) provides flexibility for mixed-volume requirements.

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