PI74FCT373ATS Equivalent & Substitute Parts

Part Overview

The PI74FCT373ATS is a D-Type Transparent Latch logic IC manufactured by Diodes Incorporated, featuring an 8:8 circuit configuration with tri-state output in a 20-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The 74FCT373 series provides transparent latch functionality suitable for data storage and bus interface applications requiring high-speed logic operation.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT373ATS
Manufacturer	Diodes Incorporated
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	4.75V ~ 5.25V
Independent Circuits	1
Propagation Delay	1.5ns
Output Current High/Low	15mA / 64mA
Operating Temperature Range	-40°C ~ 85°C
Package Type	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PI74FCT373ATS is determined by the following critical parameters:

Mandatory Matching Parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage Range: 4.75V ~ 5.25V
Independent Circuits: 1
Package Type: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 85°C

Allowable Variation Parameters:

Propagation Delay Time: Up to 2ns (original 1.5ns)
Output Current High: 15mA to 32mA
Output Current Low: 12mA to 64mA
Product Status: Active or Discontinued at DiGi Electronics (preferred over Obsolete)
RoHS Compliance: ROHS3 Compliant preferred for new designs
Packaging Format: Bulk or Tube

All identified substitute parts maintain identical functional specifications and package footprints, ensuring direct replacement capability in existing PCB designs.

Parameter Comparison

Part Number	Manufacturer	Product Status	Propagation Delay (ns)	Output Current High (mA)	Output Current Low (mA)	RoHS Status	Packaging
PI74FCT373ATS	Diodes Incorporated	Obsolete	1.5	15	64	RoHS non-compliant	Bulk
74FCT373ATSOG	IDT	Active	2	15	48	Not specified	Bulk
CY74FCT2373CTSOC	Texas Instruments	Active	1.5	15	12	ROHS3 Compliant	Tube
CY74FCT373ATSOC	Texas Instruments	Active	2	32	64	ROHS3 Compliant	Tube
CY74FCT373ATSOCT	Texas Instruments	Discontinued at DiGi Electronics	2	32	64	ROHS3 Compliant	Not specified
CY74FCT373TSOC	Texas Instruments	Active	2	32	64	ROHS3 Compliant	Tube

Engineering Selection Recommendations

Primary Recommendation: CY74FCT373ATSOC (Texas Instruments)

This part is the optimal substitute for the obsolete PI74FCT373ATS. It maintains identical electrical specifications, operates within the same supply voltage and temperature ranges, and is actively manufactured. The ROHS3 compliance status supports modern design standards and regulatory requirements. Texas Instruments' active product status ensures long-term availability and supply chain stability.

Secondary Recommendation: CY74FCT373TSOC (Texas Instruments)

An alternative active substitute with identical output current specifications to CY74FCT373ATSOC. Both parts are functionally equivalent for the 74FCT373 base product number and offer equivalent performance characteristics.

Alternative Option: 74FCT373ATSOG (IDT)

This part provides active product status and maintains core electrical parameters. However, RoHS compliance status is not specified, which may present considerations for applications requiring documented regulatory compliance.

Not Recommended: CY74FCT373ATSOCT (Texas Instruments)

Although this part meets all electrical and mechanical requirements, its discontinued status at DiGi Electronics indicates reduced availability and potential supply chain constraints. Selection should be limited to applications where existing inventory is available.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI74FCT373ATS with any of the listed substitutes?

A: Yes. All listed substitute parts maintain identical package footprints (20-SOIC), pin configurations, and electrical operating ranges (4.75V ~ 5.25V supply, -40°C ~ 85°C operating temperature). Direct PCB replacement is supported without design modifications.

Q: What is the difference between the substitute parts?

A: Differences exist in propagation delay (1.5ns vs. 2ns), output current capabilities, manufacturer, and RoHS compliance status. All variations remain within acceptable operating parameters for 74FCT373 series applications. Selection should be based on specific application requirements and supply chain availability.

Q: Why is the original PI74FCT373ATS obsolete?

A: The Diodes Incorporated PI74FCT373ATS has reached end-of-life status. Active alternatives from IDT and Texas Instruments provide equivalent functionality with improved product lifecycle support and regulatory compliance.

Q: Does RoHS compliance matter for my application?

A: RoHS3 compliance is required for applications subject to EU regulations or customer specifications mandating lead-free components. CY74FCT373ATSOC, CY74FCT373ATSOCT, and CY74FCT373TSOC all meet ROHS3 requirements. The PI74FCT373ATS and 74FCT373ATSOG do not carry RoHS compliance documentation.

Q: What is the difference between Bulk and Tube packaging?

A: Bulk packaging typically indicates standard reel or tape format for automated assembly. Tube packaging indicates individual component packaging. Both formats are compatible with standard PCB assembly processes. Selection depends on procurement and assembly workflow requirements.

Q: Are there any performance differences I should consider?

A: Propagation delay varies between 1.5ns and 2ns across substitutes. Output current specifications range from 12mA to 32mA (high) and 12mA to 64mA (low). These variations remain within the 74FCT373 series specifications and do not affect functional compatibility in standard applications.

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