74FCT574CTQG Equivalent & Substitute Parts

Part Overview

The 74FCT574CTQG is an octal D-type flip-flop logic integrated circuit manufactured by Renesas Electronics Corporation. This device functions as a standard 8-bit positive edge-triggered flip-flop with tri-state, non-inverted outputs in a 20-SSOP surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74FCT574CTQG
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	5.2ns @ 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

Substitution for the 74FCT574CTQG is determined by the following critical parameters:

Logic Function: D-type flip-flop with 8-bit configuration and positive edge triggering
Output Configuration: Tri-state, non-inverted outputs
Package Compatibility: 20-SSOP surface mount package (0.154", 3.90mm Width)
Electrical Specifications: Operating voltage range, propagation delay, and output drive capability
Environmental Compliance: RoHS3 compliance and operating temperature range

All substitute parts listed maintain compatibility across these core parameters. Substitute parts are grouped by base product number (74FCT2574, 74FCT374, 74FCT377, 74FCT574) and are available from active product lines, ensuring long-term availability compared to the obsolete original part.

Parameter Comparison

Parameter	74FCT574CTQG (Original)	CY74FCT2574ATQCT	CY74FCT2574CTQCT	CY74FCT374ATQCT	CY74FCT374TQCT	CY74FCT377ATQCT	CY74FCT574ATQCT	CY74FCT574CTQCT	CY74FCT574TQCT
Manufacturer	Renesas	Texas Instruments	Texas Instruments	Cypress Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Series	74FCT	74FCT	74FCT	74FCT	74FCT	74FCT	74FCT	74FCT	74FCT
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	5.2ns @ 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
Voltage Supply Range	4.5V ~ 5.5V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75 ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Current - Output High, Low	15mA, 48mA	15mA, 12mA	15mA, 12mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA
Current - Quiescent (Iq)	1 mA	200 µA	200 µA	200 µA	200 µA	200 µA	200 µA	200 µA	200 µA
Input Capacitance	6 pF	5 pF	5 pF	5 pF	5 pF	5 pF	5 pF	5 pF	5 pF
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 Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
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 listed substitute parts are active products with ROHS3 compliance, ensuring regulatory alignment and long-term availability. The 74FCT574CTQG is obsolete; therefore, selection of an active substitute is mandatory for new designs and ongoing production support.

Primary substitutes with closest electrical alignment:

CY74FCT2574CTQCT and CY74FCT574CTQCT match the original propagation delay specification of 5.2ns at 50pF, providing direct functional equivalence. Both are manufactured by Texas Instruments and maintain tri-state, non-inverted output configuration with ROHS3 compliance.

Alternative substitutes with acceptable performance characteristics:

CY74FCT574ATQCT, CY74FCT574TQCT, CY74FCT2574ATQCT, CY74FCT374ATQCT, CY74FCT374TQCT, and CY74FCT377ATQCT are all active products within the 74FCT series. These parts maintain the same package footprint, operating temperature range, and logic function. Propagation delays range from 6.2ns to 10ns, which remains within acceptable timing margins for most applications using the original part.

Compliance considerations:

All substitute parts carry ROHS3 compliance certification. Moisture sensitivity levels (MSL 2, 1 Year) for substitute parts differ from the original (MSL 1, Unlimited), requiring appropriate handling and storage protocols during manufacturing and assembly.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT377ATQCT be used as a direct replacement for 74FCT574CTQG?

A: CY74FCT377ATQCT is functionally compatible in terms of package, operating temperature, and logic family. However, it differs in output type (non-inverted only, without tri-state capability). Verify circuit requirements for tri-state output functionality before substitution.

Q: What is the difference between CY74FCT2574CTQCT and CY74FCT574CTQCT?

A: Both parts share identical propagation delay (5.2ns @ 50pF), voltage supply range (4.75V ~ 5.25V), and package specifications. The primary difference is the base product number designation (74FCT2574 versus 74FCT574), reflecting different internal logic configurations. Both are functionally equivalent for 8-bit D-type flip-flop applications.

Q: Are all substitute parts pin-compatible with the original 74FCT574CTQG?

A: All listed substitute parts use the 20-SSOP package with identical physical dimensions (0.154", 3.90mm Width). Pin compatibility is maintained across all substitutes for standard D-type flip-flop signal assignments.

Q: What is the impact of the MSL rating change from 1 to 2?

A: MSL 2 (1 Year) requires stricter moisture control during storage and handling compared to MSL 1 (Unlimited). Components must be stored in dry conditions and used within one year of packaging. Implement appropriate moisture barrier packaging and baking procedures if components exceed storage time limits.

Q: Which substitute offers the best performance match to the original part?

A: CY74FCT2574CTQCT and CY74FCT574CTQCT both match the original 5.2ns propagation delay specification at 50pF load. These parts provide the closest electrical performance alignment and are recommended for timing-critical applications.

Q: Are there inventory considerations when selecting a substitute?

A: Inventory availability varies by substitute part. CY74FCT574ATQCT (6108 Pcs), CY74FCT2574ATQCT (3807 Pcs), and CY74FCT377ATQCT (3564 Pcs) maintain higher stock levels, supporting consistent procurement for production volumes.

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