CY74FCT373TSOCT Equivalent & Substitute Parts

Part Overview

The CY74FCT373TSOCT is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output capability. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates within a 4.75V to 5.25V supply voltage range and is housed in a 20-SOIC surface mount package.

Key Parameters

Parameter	Value
Manufacturer Part Number	CY74FCT373TSOCT
Manufacturer	Texas Instruments
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	4.75V ~ 5.25V
Delay Time - Propagation	2ns
Current - Output High, Low	32mA, 64mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the CY74FCT373TSOCT is determined by strict equivalence across the following critical parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Voltage Supply Range: 4.75V ~ 5.25V
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 85°C
Propagation Delay: 2ns
Output Current Ratings: 32mA (High), 64mA (Low)

All identified substitute parts maintain these electrical and mechanical specifications, ensuring direct functional compatibility without circuit redesign.

Parameter Comparison

Parameter	CY74FCT373TSOCT	CY74FCT373ATSOCT	CY74FCT573ATSOCT	CY74FCT573TSOCT	74FCT373ATSOG
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	IDT
Logic Type	D-Type Transparent Latch	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	8:8
Output Type	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Delay Time - Propagation	2ns	2ns	2ns	2ns	2ns
Current - Output High, Low	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	15mA, 48mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Discontinued at DiGi Electronics	Active	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

For applications currently utilizing the CY74FCT373TSOCT, the following substitution hierarchy is established based on product status and compliance certifications:

Primary Recommendation: CY74FCT573ATSOCT This Texas Instruments part maintains full electrical and mechanical equivalence with active product status and ROHS3 compliance. Tape & Reel packaging availability supports high-volume production requirements.

Secondary Recommendation: 74FCT373ATSOG Manufactured by IDT (Integrated Device Technology Inc), this part provides active product status and maintains all critical electrical parameters. Output current ratings are reduced (15mA High, 48mA Low) compared to the original specification; circuit designs must confirm adequate drive capability for connected loads.

Tertiary Options: CY74FCT373ATSOCT and CY74FCT573TSOCT Both parts are discontinued at DiGi Electronics but maintain full parametric equivalence. These options are suitable only when existing inventory is available and long-term procurement is not required.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT373TSOCT be directly replaced with CY74FCT573ATSOCT? A: Yes. Both parts share identical logic type, circuit configuration, output type, voltage supply range, propagation delay, output current ratings, operating temperature range, and 20-SOIC package specifications. No circuit modifications are required.

Q: What is the difference between the 74FCT373 and 74FCT573 base product numbers? A: The base product numbers differ, but the substitute parts listed (CY74FCT573ATSOCT and CY74FCT573TSOCT) maintain all electrical and mechanical parameters required for functional equivalence with the CY74FCT373TSOCT.

Q: Is the IDT 74FCT373ATSOG a suitable replacement? A: The 74FCT373ATSOG is functionally equivalent with one exception: output current ratings are 15mA (High) and 48mA (Low) versus the original 32mA and 64mA. Verify that connected load impedances do not exceed the reduced drive capability of this alternative.

Q: Are all substitute parts ROHS3 compliant? A: CY74FCT373ATSOCT, CY74FCT573ATSOCT, and CY74FCT573TSOCT are confirmed ROHS3 compliant. The IDT 74FCT373ATSOG RoHS status is not specified in available documentation.

Q: What packaging options are available for these substitutes? A: CY74FCT573ATSOCT is available in Tape & Reel packaging. CY74FCT373ATSOCT and CY74FCT573TSOCT packaging specifications are not detailed. The IDT 74FCT373ATSOG is available in Bulk packaging.

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