74ACQ373SC D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACQ373SC is a D-Type Transparent Latch IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability in a 20-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74ACQ373SC operates across a 2V to 6V supply voltage range with a propagation delay of 5.5ns and output current capability of 24mA for both high and low states. The part is designed for surface mount applications and carries MSL Level 1 (Unlimited) moisture sensitivity rating.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 6V
Propagation Delay	5.5ns
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

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ373SC 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)
Mounting Type: Surface Mount
Output Current: 24mA (both high and low)

Secondary Compatibility Parameters:

Voltage Supply Range: Must encompass or match 2V ~ 6V
Propagation Delay: Acceptable range 3ns ~ 7.5ns (faster or equivalent performance)
Operating Temperature: Must support -40°C ~ 85°C minimum
Independent Circuits: 1 channel

Substitute parts are grouped into two categories: Direct Functional Equivalents (identical or superior electrical performance) and Parametric Equivalents (functionally compatible with minor performance variations).

Parameter Comparison

Part Number	Manufacturer	Voltage Supply	Propagation Delay (ns)	Operating Temp (°C)	Package	Product Status	RoHS Compliance
74ACQ373SC	onsemi	2V ~ 6V	5.5	-40 ~ 85	20-SOIC (7.50mm)	Obsolete	N/A
MC74AC373DWG	onsemi	2V ~ 6V	7.5	-40 ~ 85	20-SOIC (7.50mm)	Active	ROHS3 Compliant
CD74AC373M	Harris Corporation	1.5V ~ 5.5V	3	-55 ~ 125	20-SOIC (7.50mm)	Obsolete	RoHS Non-Compliant
CD74AC373M96	Texas Instruments	1.5V ~ 5.5V	3	-55 ~ 125	20-SOIC (7.50mm)	Active	ROHS3 Compliant
SN74AC373DW	Texas Instruments	2V ~ 6V	7.5	-40 ~ 85	20-SOIC (7.50mm)	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74AC373DWR	Texas Instruments	2V ~ 6V	7.5	-40 ~ 85	20-SOIC (7.50mm)	Active	ROHS3 Compliant
SN74AC373MDWREP	Texas Instruments	2V ~ 6V	7.5	-55 ~ 125	20-SOIC (7.50mm)	Active	ROHS3 Compliant
SN74AC373NSR	Texas Instruments	2V ~ 6V	7.5	-40 ~ 85	20-SO (5.30mm)	Active	ROHS3 Compliant
SN74AC563DW	Texas Instruments	2V ~ 6V	4.6	-40 ~ 85	20-SOIC (7.50mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status, Full Compliance):

SN74AC373DWR (Texas Instruments) — Active product with ROHS3 compliance. Identical voltage supply range (2V ~ 6V), matching operating temperature (-40°C ~ 85°C), and equivalent propagation delay (7.5ns). Available in Cut Tape and Digi-Reel packaging with 4365 units in stock.
MC74AC373DWG (onsemi) — Active product with ROHS3 compliance. Maintains voltage supply range (2V ~ 6V) and operating temperature (-40°C ~ 85°C). Propagation delay of 7.5ns is acceptable for most applications. Available in Tube packaging with 2028 units in stock.
SN74AC373MDWREP (Texas Instruments) — Active product with ROHS3 compliance and extended operating temperature range (-55°C ~ 125°C). Identical voltage supply (2V ~ 6V) and propagation delay (7.5ns). Tape & Reel packaging with 655 units in stock.

Alternative Substitutes (Enhanced Performance):

CD74AC373M96 (Texas Instruments) — Active product with ROHS3 compliance. Superior propagation delay (3ns) and extended operating temperature (-55°C ~ 125°C). Voltage supply range (1.5V ~ 5.5V) encompasses the original specification. Cut Tape packaging with 1844 units in stock.
SN74AC563DW (Texas Instruments) — Parametric equivalent with active status and ROHS3 compliance. Improved propagation delay (4.6ns) compared to the original 5.5ns. Identical voltage supply and operating temperature specifications. Tube packaging with 1027 units in stock.

Package Consideration:

SN74AC373NSR uses a narrower 20-SO package (5.30mm width) versus the standard 20-SOIC (7.50mm width). This part is suitable only if PCB layout accommodates the different footprint.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AC373DWR as a direct replacement for 74ACQ373SC?

A: Yes. SN74AC373DWR is a direct functional equivalent. Both parts share identical voltage supply range (2V ~ 6V), operating temperature (-40°C ~ 85°C), output current (24mA), and package type (20-SOIC 7.50mm). The propagation delay difference (7.5ns vs. 5.5ns) is within acceptable tolerance for most digital logic applications. SN74AC373DWR is currently active and ROHS3 compliant.

Q: What is the difference between MC74AC373DWG and SN74AC373DWR?

A: Both parts are functionally equivalent with identical electrical specifications (2V ~ 6V supply, 7.5ns propagation delay, -40°C ~ 85°C operating range). The primary differences are manufacturer (onsemi vs. Texas Instruments) and packaging format (Tube vs. Cut Tape/Digi-Reel). Selection depends on procurement requirements and packaging preferences.

Q: Why would I choose CD74AC373M96 over other substitutes?

A: CD74AC373M96 offers superior propagation delay (3ns) and extended operating temperature range (-55°C ~ 125°C), making it suitable for high-speed or wide-temperature applications. However, its voltage supply range (1.5V ~ 5.5V) is slightly narrower than the original specification. This part is recommended only when enhanced performance is required.

Q: Is SN74AC373NSR compatible with my PCB designed for 74ACQ373SC?

A: SN74AC373NSR is electrically equivalent but uses a different package footprint. The 20-SO package (5.30mm width) differs from the standard 20-SOIC (7.50mm width) used by the original part. PCB layout modification is required for this substitution.

Q: What does ROHS3 compliance mean for my application?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. This is mandatory for many commercial and industrial applications, particularly in European markets. All recommended active substitutes carry ROHS3 compliance.

Q: Can I use SN74AC563DW instead of 74ACQ373SC?

A: SN74AC563DW is a parametric equivalent with identical voltage supply (2V ~ 6V) and operating temperature (-40°C ~ 85°C). The improved propagation delay (4.6ns) is superior to the original 5.5ns. However, verify that your circuit design does not depend on the specific base product number (74AC373 vs. 74AC563), as these represent different device families with potentially different internal architectures.

Q: What inventory levels should I consider for long-term supply?

A: SN74AC373DWR offers the highest inventory (4365 units), followed by MC74AC373DWG (2028 units) and CD74AC373M96 (1844 units). For critical applications requiring sustained supply, SN74AC373DWR or MC74AC373DWG are recommended due to active product status and higher stock levels.

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