74FCT574ATQG Equivalent & Substitute Parts

Part Overview

The 74FCT574ATQG is an 8-bit D-type flip-flop logic integrated circuit manufactured by Renesas Electronics Corporation in a 20-SSOP surface mount package. This component functions as a standard octal latch with tri-state, non-inverted outputs, designed for digital logic applications requiring edge-triggered data capture and storage.

The 74FCT574ATQG is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and system maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	74FCT574ATQG
Manufacturer	Renesas Electronics Corporation
Series	74FCT
Type	D-Type Flip-Flop
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Max Propagation Delay	6.5ns @ 5V, 50pF
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 74FCT574ATQG are selected based on the following critical parameters that determine functional compatibility:

Core Functional Parameters:

8-bit D-type flip-flop architecture
Positive edge trigger configuration
Tri-state output capability
Non-inverted output logic
20-SSOP package footprint (0.154", 3.90mm Width)
Surface mount mounting type
Operating temperature range: -40°C ~ 85°C

Electrical Performance Parameters:

Propagation delay specifications
Output current drive capability (High and Low)
Supply voltage operating range
Quiescent current consumption
Input capacitance

All substitute parts listed maintain the same functional architecture, package form factor, and operating temperature range as the original 74FCT574ATQG. Variations in propagation delay, output current, and supply voltage tolerance are documented in the parameter comparison table below.

Parameter Comparison

Parameter	74FCT574ATQG (Original)	CY74FCT2574ATQCT	CY74FCT2574CTQCT	CY74FCT374ATQCT	CY74FCT374TQCT	CY74FCT377ATQCT	CY74FCT574ATQCT	CY74FCT574CTQCT	CY74FCT574TQCT
Manufacturer	Renesas Electronics	Texas Instruments	Texas Instruments	Cypress Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Bits	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	Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Max Propagation Delay	6.5ns @ 5V, 50pF	6.5ns @ 50pF	5.2ns @ 5V, 50pF	6.2ns @ 50pF	10ns @ 5V, 50pF	7.2ns @ 5V, 50pF	6.2ns @ 50pF	5.2ns @ 50pF	6.2ns @ 50pF
Current - Output High (mA)	15	15	15	32	32	32	32	32	32
Current - Output Low (mA)	48	12	12	64	64	64	64	64	64
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
Current - Quiescent (µA)	1000	200	200	200	200	200	200	200	200
Input Capacitance (pF)	6	5	5	5	5	5	5	5	5
Operating Temperature	-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	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	2 (1 Year)	2 (1 Year)	Not specified	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

All substitute parts listed are active production components with established supply chains, addressing the obsolescence status of the original 74FCT574ATQG. Selection among substitutes depends on specific application requirements:

For Direct Replacement (Closest Electrical Match): CY74FCT574ATQCT and CY74FCT574TQCT maintain the same base product number (74FCT574) and output current specifications (32mA High, 64mA Low) as the substitute family. These parts are manufactured by Texas Instruments and carry ROHS3 compliance with MSL-2 ratings.

For Improved Performance (Lower Propagation Delay): CY74FCT2574CTQCT and CY74FCT574CTQCT offer reduced propagation delay (5.2ns) compared to the original specification (6.5ns), providing faster logic switching characteristics while maintaining tri-state output capability and identical package footprint.

For Lower Power Consumption: All substitute parts reduce quiescent current from 1 mA to 200 µA, resulting in significantly lower standby power consumption across the operating temperature range.

Supply Voltage Consideration: The original part operates across 4.5V to 5.5V. All substitutes operate within a narrower range of 4.75V to 5.25V. Verify that system supply voltage remains within this tighter specification before selection.

Output Current Capability: The original 74FCT574ATQG specifies 15mA High and 48mA Low output current. Most substitutes provide higher output current (32mA High, 64mA Low), which is compatible with the original specification and provides additional drive capability. CY74FCT2574ATQCT and CY74FCT2574CTQCT maintain lower output current (15mA High, 12mA Low) and may be selected for current-limited applications.

Compliance and Certifications: All substitute parts are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements. MSL-2 ratings require controlled storage conditions (1 year at 30°C/60% RH) compared to the original MSL-1 unlimited rating.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT377ATQCT substitute for 74FCT574ATQG? A: CY74FCT377ATQCT differs in output type specification. The original part specifies tri-state, non-inverted outputs, while CY74FCT377ATQCT specifies non-inverted outputs without explicit tri-state designation. Functional compatibility depends on circuit requirements for output tri-state control. Verify tri-state functionality is not critical to the application before selection.

Q: What is the impact of reduced supply voltage range on system design? A: The original part accepts 4.5V to 5.5V supply voltage. All substitutes operate within 4.75V to 5.25V. If the system supply voltage drops below 4.75V or exceeds 5.25V, substitute parts will not operate within specification. Confirm system power supply regulation remains within the narrower substitute range.

Q: Are the 20-SSOP packages from different manufacturers pin-compatible? A: Yes. All substitute parts use the identical 20-SSOP (0.154", 3.90mm Width) package with the same pin configuration. PCB footprints and solder reflow profiles are compatible across all listed parts.

Q: How does the reduced quiescent current affect system power budget? A: Quiescent current reduction from 1 mA to 200 µA per part represents an 80% decrease in standby power consumption. For systems with multiple logic ICs, this reduction significantly lowers overall system power dissipation during idle states.

Q: What is the significance of MSL-2 rating versus MSL-1? A: MSL-1 (unlimited) allows indefinite storage at any humidity level. MSL-2 (1 year) requires controlled storage at 30°C and 60% relative humidity. Substitute parts must be stored in dry-pack conditions and used within one year of manufacture date. Verify moisture control procedures are in place before procurement.

Q: Do propagation delay differences affect timing-critical applications? A: The original part specifies 6.5ns maximum propagation delay. Substitutes range from 5.2ns to 10ns. For applications with tight timing margins, select CY74FCT2574CTQCT or CY74FCT574CTQCT (5.2ns) for improved performance, or CY74FCT374TQCT (10ns) only if timing budget permits. Verify setup and hold time requirements against selected substitute specifications.

Q: Which substitute offers the best overall compatibility? A: CY74FCT574ATQCT and CY74FCT574TQCT maintain the same base product number (74FCT574), identical package, and compatible electrical specifications. Both are active production parts from Texas Instruments with established supply availability and ROHS3 compliance.

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