74ABT574CSJ Equivalent & Substitute Parts

Part Overview

The 74ABT574CSJ is an 8-bit D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 20-SOIC package with tri-state inverted outputs. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The 74ABT574 series provides standard D-type flip-flop functionality with positive edge triggering, suitable for digital logic applications requiring octal data storage and output control.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ABT574CSJ
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	5 ns
Trigger Type	Positive Edge
Current - Output High, Low	32 mA, 64 mA
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 (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the 74ABT574CSJ is determined by the following critical parameters:

Functional Compatibility Requirements:

Type: D-Type flip-flop with 8-bit configuration
Number of Elements: 1
Number of Bits per Element: 8
Trigger Type: Positive Edge
Operating Temperature Range: -40°C ~ 85°C minimum
Voltage Supply Range: Must overlap with 4.5V ~ 5.5V
Mounting Type: Surface Mount

Electrical Performance Criteria:

Clock Frequency: 200 MHz or higher
Max Propagation Delay: 5 ns or lower at 5V, 50pF load
Current Output Capability: Minimum 32 mA (High), 64 mA (Low)
Quiescent Current: Acceptable range up to 250 µA

Package Considerations:

Primary package: 20-SOIC form factor
Physical dimensions must accommodate PCB layout constraints
Pinout compatibility with 74ABT574 base product number

Substitute parts are grouped into two categories: direct pin-compatible replacements within the 74ABT series (SN74ABT574 variants) and functionally equivalent alternatives from the 74FCT series (CY74FCT2574 and CY74FCT574 variants). The 74FCT series offers enhanced performance characteristics while maintaining functional compatibility.

Parameter Comparison

Parameter	74ABT574CSJ (Main)	SN74ABT574ANSR	SN74ABT574ADW	SN74ABT574ADWR	CY74FCT2574CTSOC	CY74FCT574ATSOCT
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Cypress Semiconductor
Series	74ABT	74ABT	74ABT	74ABT	74FCT	74FCT
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Bits	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
Clock Frequency	200 MHz	200 MHz	200 MHz	200 MHz	250 MHz	250 MHz
Max Propagation Delay @ 5V, 50pF	5 ns	6.6 ns	4.8 ns	4.8 ns	5.2 ns	6.5 ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Current - Output High, Low	32 mA, 64 mA	32 mA, 64 mA	32 mA, 64 mA	32 mA, 64 mA	15 mA, 12 mA	64 mA, 32 mA
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
Current - Quiescent (Iq)	50 µA	250 µA	250 µA	250 µA	200 µA	200 µA
Input Capacitance	5 pF	4.6 pF	4.6 pF	4.6 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
Package / Case	20-SOIC (0.209", 5.30mm)	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
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	Vendor Undefined

Engineering Selection Recommendations

Primary Substitutes (74ABT Series - Direct Compatibility):

SN74ABT574ANSR and SN74ABT574ADW/ADWR are the preferred substitutes for the 74ABT574CSJ. These Texas Instruments components maintain the 74ABT series designation, ensuring electrical and functional compatibility. All three variants are currently in active production status with ROHS3 compliance and REACH Unaffected certification. The SN74ABT574ANSR preserves the original 20-SOIC (0.209", 5.30mm) package footprint, enabling direct PCB layout compatibility. The SN74ABT574ADW and SN74ABT574ADWR variants use the wider 20-SOIC (0.295", 7.50mm) package but maintain identical electrical performance and pinout. Packaging options include Tape & Reel (TR) for SN74ABT574ANSR and SN74ABT574ADWR, and Tube for SN74ABT574ADW, accommodating various production workflows.

Secondary Substitutes (74FCT Series - Enhanced Performance):

CY74FCT2574CTSOC and CY74FCT574ATSOCT provide functional equivalence with improved electrical characteristics. The 74FCT series operates at higher clock frequencies (250 MHz versus 200 MHz) and delivers faster propagation delays in specific configurations. CY74FCT2574CTSOC achieves 5.2 ns propagation delay, matching the original specification. CY74FCT574ATSOCT provides higher output current capability (64 mA High, 32 mA Low) compared to the main part. Both variants are ROHS3 compliant and maintain MSL Level 1 rating. The CY74FCT2574CTSOC is manufactured by Texas Instruments with Active product status, while CY74FCT574ATSOCT is from Cypress Semiconductor Corp, also Active. These substitutes require verification of output polarity compatibility, as the 74FCT series provides non-inverted outputs, differing from the inverted output configuration of the 74ABT574CSJ.

Compliance and Regulatory Considerations:

All recommended substitutes maintain REACH Unaffected status and ROHS3 compliance, ensuring regulatory alignment with current environmental and hazardous substance directives. Moisture Sensitivity Level 1 (Unlimited) is consistent across all parts, eliminating moisture handling concerns during assembly and storage.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 74ABT574CSJ with SN74ABT574ADW without circuit modifications?

A: Functional replacement is possible, but package footprint differs. The 74ABT574CSJ uses 20-SOIC (0.209", 5.30mm), while SN74ABT574ADW uses 20-SOIC (0.295", 7.50mm). PCB layout adjustment is required. For direct footprint compatibility, use SN74ABT574ANSR, which maintains the narrower 5.30mm package width.

Q: What is the significance of the output type difference between the main part and substitutes?

A: The 74ABT574CSJ provides tri-state inverted outputs, while most substitutes (SN74ABT574 variants and 74FCT series) provide tri-state non-inverted outputs. This polarity difference affects signal interpretation in the circuit. Verify that your application logic accommodates non-inverted output signals before substitution.

Q: Are the 74FCT series parts (CY74FCT2574CTSOC, CY74FCT574ATSOCT) suitable replacements?

A: The 74FCT series provides functional D-type flip-flop operation with 8-bit configuration and positive edge triggering, meeting core substitution criteria. However, output polarity is non-inverted, and output current characteristics differ. CY74FCT2574CTSOC delivers comparable propagation delay (5.2 ns), while CY74FCT574ATSOCT provides higher output current (64 mA High). Verify compatibility with your specific circuit requirements before implementation.

Q: What packaging options are available for the recommended substitutes?

A: SN74ABT574ANSR is supplied in Tape & Reel (TR) format. SN74ABT574ADW is available in Tube packaging. SN74ABT574ADWR is supplied in Tape & Reel (TR) format. CY74FCT2574CTSOC is available in Tube packaging. CY74FCT574ATSOCT is supplied in Bulk packaging. Select packaging based on production volume and assembly equipment compatibility.

Q: Do all substitutes meet the same operating temperature range?

A: Yes, all recommended substitutes operate across -40°C to 85°C, matching the original 74ABT574CSJ specification. This ensures thermal compatibility across industrial and commercial temperature environments.

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

A: The 74ABT574CSJ specifies 50 µA quiescent current, while substitutes range from 200 µA to 250 µA. This represents a 4-5x increase in standby power consumption. For battery-powered or low-power applications, evaluate total system power budget impact. For standard industrial applications with continuous power supply, this difference is typically negligible.

Q: Are there supply voltage compatibility concerns?

A: The 74ABT574CSJ operates at 4.5V ~ 5.5V. The 74FCT series substitutes operate at the narrower 4.75V ~ 5.25V range. Ensure your power supply maintains voltage within the 4.75V ~ 5.25V window when using 74FCT variants. The 74ABT series substitutes maintain the original 4.5V ~ 5.5V range, providing greater voltage tolerance.

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