74ABT574CSC Equivalent & Substitute Parts

Part Overview

The 74ABT574CSC is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74ABT574CSC operates at a clock frequency of 200 MHz with a maximum propagation delay of 5ns at 5V with 50pF load. It provides tri-state inverted outputs and is designed for surface mount applications with a supply voltage range of 4.5V to 5.5V.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ABT574CSC
Manufacturer	onsemi
Series	74ABT
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Inverted
Clock Frequency	200 MHz
Max Propagation Delay @ 5V, 50pF	5ns
Trigger Type	Positive Edge
Current - Output High, Low	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Iq)	50 µA
Input Capacitance	5 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ABT574CSC is determined by the following critical parameters:

Package Compatibility: 20-SOIC form factor (0.295", 7.50mm Width) for direct PCB replacement
Functional Equivalence: D-Type flip-flop, 1 element, 8-bit configuration with positive edge triggering
Electrical Performance: Clock frequency of 200 MHz or higher, propagation delay of 5ns or faster at 5V with 50pF load
Output Configuration: Tri-state output capability with matching current drive specifications (32mA high, 64mA low)
Supply Voltage: 4.5V to 5.5V operating range
Operating Temperature: -40°C to 85°C range
Mounting Type: Surface mount technology

Substitute parts are grouped into two categories:

Category 1 - 74ABT Series (onsemi/Texas Instruments): SN74ABT574ADW, SN74ABT574ADWR, and SN74ABT574ANSR maintain the same 74ABT base product number with identical electrical specifications and performance characteristics. These parts are active products with RoHS3 compliance.

Category 2 - 74FCT Series (Texas Instruments): CY74FCT2574ATSOCT, CY74FCT574ATSOC, CY74FCT574CTSOC, and CY74FCT574TSOC are functionally equivalent D-type flip-flops with comparable performance. These parts operate within compatible voltage and temperature ranges with tri-state non-inverted outputs.

Parameter Comparison

Parameter	74ABT574CSC (Main)	SN74ABT574ADW	SN74ABT574ADWR	SN74ABT574ANSR	CY74FCT574ATSOC	CY74FCT574CTSOC	CY74FCT574TSOC	CY74FCT2574ATSOCT
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Series	74ABT	74ABT	74ABT	74ABT	74FCT	74FCT	74FCT	74FCT
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8	8
Output Type	Tri-State, 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	Tri-State, Non-Inverted
Clock Frequency	200 MHz	200 MHz	200 MHz	200 MHz	Not specified	Not specified	Not specified	250 MHz
Max Propagation Delay @ 5V, 50pF	5ns	4.8ns	4.8ns	6.6ns	7.2ns	5.2ns	10ns	10ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Current - Output High, Low	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	15mA, 12mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Current - Quiescent (Iq)	50 µA	250 µA	250 µA	250 µA	200 µA	200 µA	200 µA	200 µA
Input Capacitance	5 pF	4.6 pF	4.6 pF	4.6 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
Package / Case	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)
Mounting Type	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	Discontinued at DiGi Electronics
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	1121 Pcs New Original	2400 Pcs New Original	3100 Pcs New Original	3100 Pcs New Original	1722 Pcs New Original	1290 Pcs New Original	2615 Pcs New Original	797 Pcs New Original

Engineering Selection Recommendations

Primary Substitutes (74ABT Series)

SN74ABT574ADW and SN74ABT574ADWR are the preferred substitutes for the 74ABT574CSC. Both parts maintain the same 74ABT base product number, identical electrical specifications, and are manufactured by Texas Instruments as active products with ROHS3 compliance. These parts feature improved propagation delay (4.8ns versus 5ns) and are available in high inventory quantities. The SN74ABT574ADWR variant is supplied in Tape & Reel packaging for automated assembly processes.

SN74ABT574ANSR is functionally equivalent with the same 74ABT series characteristics and active product status. This variant uses a narrower 20-SOIC package (0.209", 5.30mm Width) compared to the standard 0.295" width. Propagation delay is 6.6ns, which remains within acceptable performance parameters for most applications.

Secondary Substitutes (74FCT Series)

CY74FCT574CTSOC and CY74FCT574ATSOC are active Texas Instruments products offering superior propagation delay performance (5.2ns and 7.2ns respectively) with ROHS3 compliance. Both parts maintain the standard 20-SOIC (0.295", 7.50mm) package footprint and are available in high inventory quantities. These parts operate within a narrower supply voltage range (4.75V to 5.25V) compared to the 74ABT series.

CY74FCT574TSOC provides equivalent functionality with 10ns propagation delay and the highest inventory availability (2615 Pcs). This part is suitable for applications where maximum propagation delay tolerance is less critical.

CY74FCT2574ATSOCT is discontinued at DiGi Electronics and features reduced output current drive (15mA high, 12mA low) compared to the main part specification. This variant is not recommended for new designs requiring full 32mA/64mA output capability.

Output Polarity Consideration

All substitute parts listed feature tri-state non-inverted outputs, whereas the 74ABT574CSC provides tri-state inverted outputs. Design integration requires verification that output inversion does not conflict with existing signal conditioning or downstream logic requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74ABT574ANSR be used as a direct replacement for the 74ABT574CSC?

A: The SN74ABT574ANSR is functionally equivalent but uses a narrower 20-SOIC package (0.209", 5.30mm Width) versus the standard 0.295" width of the 74ABT574CSC. PCB footprint compatibility must be verified before substitution. Electrical performance and pin configuration are identical.

Q: What is the primary difference between the 74ABT and 74FCT series substitutes?

A: Both series provide D-type flip-flop functionality with 8-bit configuration and positive edge triggering. The 74ABT series operates across a wider supply voltage range (4.5V to 5.5V) compared to 74FCT (4.75V to 5.25V). The 74FCT series offers faster propagation delay in certain variants. Output polarity differs: 74ABT574CSC provides inverted outputs while 74FCT substitutes provide non-inverted outputs.

Q: Why do all substitute parts have non-inverted outputs while the original part has inverted outputs?

A: The 74ABT574CSC is specified with tri-state inverted outputs. All listed substitutes feature non-inverted output configuration. Circuit design must accommodate this polarity difference through logic inversion at the output stage or signal conditioning to maintain functional equivalence.

Q: Is the CY74FCT2574ATSOCT suitable for high-current applications?

A: No. The CY74FCT2574ATSOCT provides reduced output current drive (15mA high, 12mA low) compared to the 74ABT574CSC specification (32mA high, 64mA low). This part is not recommended for applications requiring full output current capability.

Q: What packaging options are available for the substitute parts?

A: SN74ABT574ADW is supplied in Tube packaging. SN74ABT574ADWR is supplied in Tape & Reel (TR) format for automated assembly. SN74ABT574ANSR is supplied in Tape & Reel format. All 74FCT series substitutes (CY74FCT574ATSOC, CY74FCT574CTSOC, CY74FCT574TSOC) are supplied in Tube packaging. CY74FCT2574ATSOCT is supplied in Tube packaging.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The 74ABT574CSC original part does not specify RoHS status.

Q: Which substitute offers the best propagation delay performance?

A: SN74ABT574ADW and SN74ABT574ADWR both provide 4.8ns propagation delay at 5V with 50pF load, which is superior to the original 74ABT574CSC specification of 5ns. CY74FCT574CTSOC provides 5.2ns propagation delay, also meeting or exceeding the original specification.

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