74FCT574ATSOG Equivalent & Substitute Parts

Part Overview

The 74FCT574ATSOG is an 8-bit D-type flip-flop logic IC manufactured by Renesas Electronics Corporation in a 20-SOIC surface mount package. This component functions as a standard octal D-type register with tri-state, non-inverted outputs, designed for positive edge-triggered operation. The part is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74FCT574ATSOG
Manufacturer	Renesas Electronics Corporation
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Max Propagation Delay @ V, Max CL	6.5ns @ 5V, 50pF
Current - Output High, Low	15mA, 48mA
Current - Quiescent (Iq)	1 mA
Input Capacitance	6 pF
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 74FCT574ATSOG is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Package type: 20-SOIC (0.295", 7.50mm Width) surface mount
Logic function: D-type flip-flop, 8-bit, positive edge-triggered
Output configuration: Tri-state, non-inverted
Supply voltage range: Minimum 4.5V operation capability
Operating temperature range: -40°C to 85°C
Propagation delay: Maximum 6.5ns @ 5V, 50pF (or faster)
Output current capability: Minimum 15mA high, 48mA low
RoHS3 compliance and MSL Level 1

Substitute Categories:

Category A - Direct Functional Equivalents (74FCT574 Base Number): Parts maintaining identical base product number with active or recently discontinued status, meeting all critical parameters.

Category B - Functional Alternatives (74FCT374/74FCT2574 Base Numbers): Parts with different base product numbers but identical electrical function, package, and performance characteristics. These represent alternative manufacturers' implementations of the same logic function.

Category C - Functional Variants (74FCT377 Base Number): Parts with non-inverted output configuration but otherwise matching electrical specifications. Output type differs from tri-state requirement; substitution requires circuit-level evaluation.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Output Type	Propagation Delay (ns)	Supply Voltage (V)	Iq (µA)	Temp Range (°C)	Output Current High/Low (mA)
74FCT574ATSOG	Renesas	Obsolete	20-SOIC	Tri-State, Non-Inv	6.5 @ 50pF	4.5-5.5	1000	-40 to 85	15/48
CY74FCT574ATSOC	Texas Instruments	Active	20-SOIC	Tri-State, Non-Inv	7.2 @ 50pF	4.75-5.25	200	-40 to 85	32/64
CY74FCT2574ATSOCT	Texas Instruments	Discontinued	20-SOIC	Tri-State, Non-Inv	10 @ 50pF	4.75-5.25	200	-40 to 85	15/12
CD74FCT374M	Texas Instruments	Active	20-SOIC	Tri-State, Non-Inv	6.6 @ 50pF	4.75-5.25	8	0 to 70	15/48
CY74FCT374ATSOC	Texas Instruments	Active	20-SOIC	Tri-State, Non-Inv	6.5 @ 50pF	4.75-5.25	200	-40 to 85	32/64
CY74FCT374ATSOCT	Texas Instruments	Active	20-SOIC	Tri-State, Non-Inv	6.5 @ 50pF	4.75-5.25	200	-40 to 85	32/64
CY74FCT374CTSOC	Texas Instruments	Active	20-SOIC	Tri-State, Non-Inv	5.2 @ 50pF	4.75-5.25	200	-40 to 85	32/64
CY74FCT374TSOC	Texas Instruments	Active	20-SOIC	Tri-State, Non-Inv	10 @ 50pF	4.75-5.25	200	-40 to 85	32/64
CY74FCT374TSOCT	Texas Instruments	Discontinued	20-SOIC	Tri-State, Non-Inv	10 @ 50pF	4.75-5.25	200	-40 to 85	32/64
CY74FCT377ATSOC	Texas Instruments	Active	20-SOIC	Non-Inverted	7.2 @ 50pF	4.75-5.25	200	-40 to 85	32/64
CY74FCT2574ATSOC	Cypress Semiconductor	Active	20-SOIC	Tri-State, Non-Inv	Not specified	Not specified	Not specified	Not specified	Not specified

Engineering Selection Recommendations

Primary Recommendation - Category A (Direct 74FCT574 Equivalent):

CY74FCT574ATSOC is the preferred substitute. This part maintains the 74FCT574 base product number, is currently in active production status, and meets all critical electrical and mechanical parameters. The tri-state, non-inverted output configuration matches the original specification. Operating temperature range (-40°C to 85°C) and package type (20-SOIC) are identical. Propagation delay of 7.2ns is within acceptable tolerance of the original 6.5ns specification. Output current capability (32mA high, 64mA low) exceeds the original requirement. RoHS3 compliance and MSL Level 1 certification are maintained.

Secondary Recommendation - Category B (74FCT374 Functional Equivalents):

CY74FCT374ATSOCT and CY74FCT374CTSOC provide active production alternatives with identical logic function and package. CY74FCT374CTSOC offers superior propagation delay performance at 5.2ns. Both maintain full operating temperature range and RoHS3 compliance. These parts are functionally interchangeable with the original 74FCT574ATSOG in applications where the specific base product number is not a design constraint.

Alternative for Extended Temperature Range:

CD74FCT374M is not suitable as a direct substitute due to restricted operating temperature range (0°C to 70°C), which does not meet the original -40°C to 85°C specification.

Not Recommended:

CY74FCT377ATSOC differs in output type (non-inverted only, lacking tri-state capability) and is not suitable for direct substitution without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT374ATSOCT be used as a direct replacement for 74FCT574ATSOG?

A: Yes. Both parts are 8-bit D-type flip-flops in 20-SOIC packages with tri-state, non-inverted outputs and positive edge triggering. Electrical parameters are compatible. The primary difference is the base product number (74FCT374 vs. 74FCT574), which reflects different manufacturers' product lines but identical functional implementation.

Q: What is the difference between 74FCT574 and 74FCT374?

A: Both are 8-bit D-type flip-flops with identical electrical function and package. The different base numbers represent alternative product designations from different manufacturers. Functionally, they are equivalent for logic circuit applications.

Q: Does the propagation delay difference between 6.5ns and 7.2ns matter?

A: This depends on system timing requirements. The 0.7ns difference is within typical design margins for most applications. If the design has critical timing paths with less than 1ns margin, the faster CY74FCT374CTSOC (5.2ns) should be evaluated.

Q: Why is CD74FCT374M not recommended?

A: The operating temperature range is restricted to 0°C to 70°C, which does not meet the original specification of -40°C to 85°C. This part is unsuitable for applications requiring full industrial temperature range operation.

Q: Is CY74FCT377ATSOC compatible?

A: No. The CY74FCT377ATSOC has non-inverted output only, without tri-state capability. The original 74FCT574ATSOG requires tri-state output for bus-sharing applications. Substitution would require circuit redesign.

Q: What does "Active" product status mean for substitution?

A: Active status indicates the part is currently in production and available from distributors. This ensures long-term supply continuity and is preferred for new designs. Discontinued or obsolete parts carry supply risk.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL Level 1 certification, matching the environmental and handling requirements of the original 74FCT574ATSOG.

Q: Can I use CY74FCT2574ATSOC as a substitute?

A: CY74FCT2574ATSOC is functionally equivalent and in active production. However, detailed electrical parameters are not fully specified in available documentation. CY74FCT574ATSOC is the preferred choice due to complete parameter transparency.

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