74FCT574CTSOG Equivalent & Substitute Parts

Part Overview

The 74FCT574CTSOG is a D-type flip-flop logic integrated circuit manufactured by Renesas Electronics Corporation, configured as a single element with 8-bit positive edge triggering and tri-state non-inverted outputs. The device is housed in a 20-SOIC package and operates across a supply voltage range of 4.5V to 5.5V with a maximum propagation delay of 5.2ns at 5V with 50pF load.

The 74FCT574CTSOG is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements. Substitute parts must maintain functional equivalence through matching logic type, output configuration, package form factor, and critical electrical parameters.

Key Parameters

Parameter	Value
Logic 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
Max Propagation Delay @ 5V, 50pF	5.2ns
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74FCT574CTSOG are selected based on the following critical parameters that determine functional compatibility:

Core Functional Requirements:

Logic type: D-Type flip-flop
Configuration: Single element, 8-bit
Output type: Tri-state, non-inverted
Trigger type: Positive edge
Package: 20-SOIC surface mount

Electrical Compatibility Criteria:

Supply voltage range must encompass or match the original specification (4.5V ~ 5.5V)
Propagation delay must not exceed the original maximum of 5.2ns at 5V, 50pF load
Output current ratings (high and low) must support the intended application
Quiescent current must remain within acceptable power budget limits

Environmental & Compliance Requirements:

Operating temperature range: -40°C ~ 85°C
RoHS3 compliance
MSL rating of 1 (Unlimited)

Substitute parts are grouped by their adherence to these criteria. Parts with identical or superior electrical performance and matching environmental specifications are considered direct substitutes. Parts with relaxed supply voltage ranges or extended propagation delays are listed as functional alternatives with noted parameter differences.

Parameter Comparison

Parameter	74FCT574CTSOG (Main)	CY74FCT2574CTSOC	CD74FCT374M	CY74FCT374ATSOC	CY74FCT374ATSOCT	CY74FCT374CTSOC	CY74FCT374TSOC	CY74FCT377ATSOC	CY74FCT574ATSOC	CY74FCT574ATSOCT
Manufacturer	Renesas Electronics	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Cypress Semiconductor
Logic Type	D-Type FF	D-Type FF	D-Type FF	D-Type FF	D-Type FF	D-Type FF	D-Type FF	D-Type FF	D-Type FF	D-Type FF
Number of Bits	8	8	8	8	8	8	8	8	8	8
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Package	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Voltage - Supply	4.5V ~ 5.5V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Max Propagation Delay @ 5V, 50pF (ns)	5.2	5.2	6.6	6.5	6.5	5.2	10	7.2	7.2	6.5
Current - Output High (mA)	15	15	15	32	32	32	32	32	32	64
Current - Output Low (mA)	48	12	48	64	64	64	64	64	64	32
Current - Quiescent (µA)	1000	200	8	200	200	200	200	200	200	200
Input Capacitance (pF)	6	5	10	5	5	5	5	5	5	5
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Matched Electrical Performance):

CY74FCT2574CTSOC and CY74FCT374CTSOC are the primary direct substitutes. Both maintain the 5.2ns propagation delay specification, matching the original 74FCT574CTSOG performance. CY74FCT2574CTSOC is manufactured by Texas Instruments with active product status and full -40°C to 85°C operating temperature range. CY74FCT374CTSOC also maintains identical propagation delay and temperature range. Both parts are ROHS3 compliant with MSL rating 1 (Unlimited), ensuring compliance with current environmental and reliability standards.

Tier 2 - Functional Substitutes (Acceptable Performance Variation):

CY74FCT574ATSOC, CY74FCT374ATSOC, and CY74FCT374ATSOCT offer propagation delays of 6.5ns to 7.2ns, representing a 25% to 38% increase over the original specification. These parts remain within acceptable operational margins for most applications where timing is not critically constrained. All three maintain the -40°C to 85°C operating temperature range and ROHS3 compliance. CY74FCT574ATSOC and CY74FCT374ATSOC are packaged in Tube format, while CY74FCT374ATSOCT is available in Bulk packaging.

Tier 3 - Extended Timing Substitutes:

CY74FCT374TSOC presents a 10ns propagation delay, representing a 92% increase over the original specification. This part is suitable only for applications with relaxed timing requirements. CY74FCT377ATSOC, while offering 7.2ns propagation delay, features non-inverted output without tri-state capability, limiting its substitution applicability to designs not requiring tri-state output control.

Temperature Range Consideration:

CD74FCT374M operates across a reduced temperature range of 0°C to 70°C, compared to the original -40°C to 85°C specification. This part is suitable only for applications operating within this narrower temperature envelope.

Compliance Status:

All substitute parts maintain ROHS3 compliance and MSL rating 1 (Unlimited), ensuring compatibility with current manufacturing and environmental requirements. All active-status parts support ongoing procurement and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT2574CTSOC directly replace the 74FCT574CTSOG without circuit modification?

A: Yes. CY74FCT2574CTSOC maintains identical propagation delay (5.2ns), matching output type (tri-state, non-inverted), 8-bit configuration, and 20-SOIC package. The supply voltage range is narrower (4.75V to 5.25V versus 4.5V to 5.5V), but this is compatible with standard 5V logic systems. Quiescent current is reduced from 1mA to 200µA, providing improved power efficiency.

Q: What is the primary difference between CY74FCT374CTSOC and CY74FCT574ATSOC?

A: Both are 8-bit D-type flip-flops in 20-SOIC packages with tri-state non-inverted outputs. CY74FCT374CTSOC maintains the original 5.2ns propagation delay, while CY74FCT574ATSOC has 7.2ns propagation delay. CY74FCT374CTSOC is the closer electrical match to the 74FCT574CTSOG.

Q: Why does CY74FCT377ATSOC appear in the substitute list if it lacks tri-state output?

A: CY74FCT377ATSOC is listed based on the provided substitute data but has non-inverted output without tri-state capability. It is not recommended as a substitute for applications requiring tri-state output control. Designs using tri-state bus architecture must select parts with tri-state output type.

Q: Is the 20-SOIC package identical across all substitute parts?

A: Yes. All substitute parts use the 20-SOIC (0.295", 7.50mm Width) package, ensuring mechanical and electrical pin compatibility. Surface mount assembly processes remain unchanged.

Q: What is the impact of reduced quiescent current in substitute parts?

A: Substitute parts from Texas Instruments and Cypress Semiconductor feature quiescent current of 200µA compared to the original 1mA specification. This represents an 80% reduction in standby power consumption, providing system-level power efficiency improvements without affecting functional performance.

Q: Can CY74FCT574ATSOCT be used in applications requiring the full -40°C to 85°C temperature range?

A: Yes. CY74FCT574ATSOCT maintains the full -40°C to 85°C operating temperature range, matching the original specification. The "T" designation indicates Tape & Reel packaging format, which does not affect temperature performance.

Q: Why is CD74FCT374M not recommended as a primary substitute?

A: CD74FCT374M operates across a reduced temperature range of 0°C to 70°C, compared to the original -40°C to 85°C specification. It is suitable only for applications operating within this narrower envelope. Additionally, its 6.6ns propagation delay exceeds the original 5.2ns specification.

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