74ACQ373PC Equivalent & Substitute Parts

Part Overview

The 74ACQ373PC 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 system maintenance, redesign, and procurement planning. The part operates across a 2V to 6V supply voltage range with a propagation delay of 5.5ns and is housed in a 20-DIP package suitable for through-hole mounting applications.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	2V ~ 6V
Independent Circuits	1
Delay Time - Propagation	5.5ns
Current - Output High, Low	24mA, 24mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ373PC is determined by the following critical parameters: logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), package format (20-DIP), and mounting method (through-hole). All substitute parts must maintain functional equivalence within the allowed electrical operating ranges.

The substitute parts are grouped into two categories:

Direct Functional Equivalents: Parts that maintain identical or compatible electrical specifications across supply voltage, output current, and operating temperature ranges. These parts are interchangeable in applications where the original 74ACQ373PC specifications are required.

Parametric Equivalents: Parts that share the same logic function and package but may have different propagation delay characteristics or supply voltage ranges. These parts are suitable for applications where timing margins permit variation in delay performance.

Parameter Comparison

Parameter	74ACQ373PC (onsemi)	CD74AC373E (Harris)	SN74AC373N (TI)	SN74AC563N (TI)
Logic Type	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch
Circuit Configuration	8:8	8:8	8:8	8:8
Output Type	Tri-State	Tri-State	Tri-State	Tri-State
Voltage - Supply	2V ~ 6V	1.5V ~ 5.5V	2V ~ 6V	2V ~ 6V
Independent Circuits	1	1	1	1
Delay Time - Propagation	5.5ns	3ns	7.5ns	4.6ns
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Obsolete	Active	Active

Engineering Selection Recommendations

SN74AC373N (Texas Instruments) is the primary recommended substitute. This part maintains identical supply voltage range (2V ~ 6V) and operating temperature range (-40°C ~ 85°C) as the original 74ACQ373PC. The propagation delay of 7.5ns is within acceptable tolerance for most applications. The part holds active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

SN74AC563N (Texas Instruments) serves as an alternative parametric equivalent. This part offers superior propagation delay performance at 4.6ns while maintaining the same supply voltage and operating temperature specifications. Active product status and ROHS3 compliance support continued procurement. The base product number differs (74AC563 versus 74AC373), indicating a different internal circuit topology; verification of functional compatibility with the original application is required before selection.

CD74AC373E (Harris Corporation) is a direct functional equivalent with extended operating temperature range (-55°C ~ 125°C) and lower propagation delay (3ns). However, this part is classified as obsolete and carries RoHS non-compliant status, limiting its suitability for new designs or systems requiring regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can the SN74AC373N directly replace the 74ACQ373PC without circuit modifications?

A: Yes. The SN74AC373N maintains identical supply voltage (2V ~ 6V), operating temperature (-40°C ~ 85°C), output current (24mA), and package format (20-DIP through-hole). The propagation delay difference (7.5ns versus 5.5ns) is within typical design margins for latch applications.

Q: What is the difference between the SN74AC373N and SN74AC563N?

A: Both parts share the same package, supply voltage, and operating temperature range. The SN74AC563N features faster propagation delay (4.6ns) and uses a different base product number (74AC563), indicating different internal circuit implementation. Functional compatibility must be verified through datasheet comparison before substitution.

Q: Why is the CD74AC373E not recommended as a primary substitute despite superior performance?

A: The CD74AC373E is classified as obsolete with RoHS non-compliant status. While it offers faster propagation delay (3ns) and extended temperature range (-55°C ~ 125°C), its discontinued status creates long-term procurement risk and regulatory compliance concerns for new applications.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are available in 20-DIP (0.300", 7.62mm) through-hole packages, ensuring mechanical and electrical compatibility with existing PCB designs without layout modifications.

Q: What compliance certifications should I verify for regulatory requirements?

A: The SN74AC373N and SN74AC563N both carry ROHS3 compliance and REACH Unaffected status. The CD74AC373E is RoHS non-compliant. Verify compliance requirements against your specific application and regional regulations before final part selection.

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