PI74FCT574ATS Equivalent & Substitute Parts

Part Overview

The PI74FCT574ATS is an 8-bit D-type flip-flop logic integrated circuit manufactured by Diodes Incorporated in a 20-SOIC surface mount package. This device functions as a standard octal latch with tri-state, non-inverted outputs, designed for positive edge-triggered operation. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Device Type	D-Type Flip-Flop, 1 Element, 8 Bit
Output Configuration	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Package	20-SOIC (0.295", 7.50mm Width)
Supply Voltage	4.75V – 5.25V
Operating Temperature	-40°C to 85°C (TA)
Max Propagation Delay	6.5ns @ 5V, 50pF
Output Current (High/Low)	15mA / 64mA
Quiescent Current	500 µA
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the PI74FCT574ATS is determined by the following criteria:

Primary Compatibility Requirements:

Device type: D-type flip-flop, 1 element, 8-bit configuration
Output type: Tri-state, non-inverted
Trigger mechanism: Positive edge
Package: 20-SOIC (0.295", 7.50mm Width)
Mounting: Surface mount
Operating temperature range: -40°C to 85°C minimum

Electrical Compatibility Parameters:

Supply voltage range must encompass or match 4.75V – 5.25V
Propagation delay specifications must be documented
Output current ratings must support the application requirements
Input capacitance and quiescent current are secondary considerations

Substitute parts are grouped into two categories:

Direct 74FCT574 Series Substitutes – Parts with identical base product number (74FCT574), manufactured by different vendors or with different packaging/temperature grades
Functional Equivalents – Parts with different base numbers (74FCT2574, 74ABT574) that maintain identical pinout, package, and functional operation but may have different electrical performance characteristics

Parameter Comparison

Part Number	Manufacturer	Status	Package	Supply Voltage	Max Prop. Delay (ns)	Output Current High/Low (mA)	Iq (µA)	RoHS
PI74FCT574ATS	Diodes Inc.	Obsolete	20-SOIC	4.75–5.25V	6.5 @ 5V, 50pF	15 / 64	500	Non-compliant
74FCT374CTSOG	IDT	Active	20-SOIC	4.5–5.5V	5.2 @ 5V, 50pF	15 / 48	1000	ROHS3
CY74FCT2574ATSOC	Cypress	Active	20-SOIC	Not specified	Not specified	Not specified	Not specified	Not specified
CY74FCT2574ATSOCT	Texas Instruments	Discontinued	20-SOIC	4.75–5.25V	10 @ 5V, 50pF	15 / 12	200	ROHS3
CY74FCT2574CTSOC	Texas Instruments	Active	20-SOIC	4.75–5.25V	5.2 @ 5V, 50pF	15 / 12	200	ROHS3
CY74FCT574ATSOC	Texas Instruments	Active	20-SOIC	4.75–5.25V	7.2 @ 50pF	32 / 64	200	ROHS3
CY74FCT574ATSOCT	Cypress	Active	20-SOIC	4.75–5.25V	6.5 @ 5V, 50pF	64 / 32	200	ROHS3
CY74FCT574CTSOC	Texas Instruments	Active	20-SOIC	4.75–5.25V	5.2 @ 50pF	32 / 64	200	ROHS3
CY74FCT574TSOC	Texas Instruments	Active	20-SOIC	4.75–5.25V	10 @ 50pF	32 / 64	200	ROHS3
SN74ABT574ADW	Texas Instruments	Active	20-SOIC	4.5–5.5V	4.8 @ 5V, 50pF	32 / 64	250	ROHS3
SN74ABT574ADWR	Texas Instruments	Active	20-SOIC	4.5–5.5V	4.8 @ 5V, 50pF	32 / 64	250	ROHS3

Engineering Selection Recommendations

For Active Product Status Requirement: All substitute parts listed maintain active product status except CY74FCT2574ATSOCT (discontinued at DiGi Electronics). Active parts ensure ongoing availability and manufacturer support: 74FCT374CTSOG, CY74FCT2574ATSOC, CY74FCT2574CTSOC, CY74FCT574ATSOC, CY74FCT574ATSOCT, CY74FCT574CTSOC, CY74FCT574TSOC, SN74ABT574ADW, and SN74ABT574ADWR.

For RoHS Compliance: The original PI74FCT574ATS is RoHS non-compliant. All active substitute parts are ROHS3 compliant, meeting modern environmental and regulatory standards. This is a significant advantage for new designs and procurement in regulated markets.

For Electrical Performance:

CY74FCT574CTSOC and CY74FCT2574CTSOC offer the fastest propagation delay (5.2ns) among 74FCT series parts
SN74ABT574ADW and SN74ABT574ADWR (74ABT series) provide superior speed (4.8ns) with wider supply voltage tolerance (4.5–5.5V)
CY74FCT574ATSOCT matches the original propagation delay specification (6.5ns) with lower quiescent current (200 µA vs. 500 µA)

For Packaging and Availability: All substitute parts use identical 20-SOIC package geometry. Inventory levels vary; CY74FCT574ATSOCT shows highest stock (23,169 pcs), while SN74ABT574ADWR and SN74ABT574ADW maintain substantial availability (3,100 and 2,400 pcs respectively).

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI74FCT574ATS with any of these substitute parts?

A: Yes, all listed substitute parts maintain identical pinout, package (20-SOIC), and functional operation (D-type flip-flop, 8-bit, positive edge trigger, tri-state output). Physical and electrical compatibility is confirmed for all parts listed.

Q: What is the difference between 74FCT574 and 74FCT2574 series?

A: Both are 8-bit D-type flip-flops in 20-SOIC packages with identical pinout and functional operation. The 74FCT2574 variants (CY74FCT2574CTSOC, CY74FCT2574ATSOCT) are functionally equivalent but may have different electrical performance characteristics. Consult specific datasheets for propagation delay and current specifications.

Q: Why should I choose 74ABT series (SN74ABT574ADW, SN74ABT574ADWR) over 74FCT series?

A: The 74ABT series offers faster propagation delay (4.8ns vs. 5.2–7.2ns for 74FCT variants) and wider supply voltage tolerance (4.5–5.5V vs. 4.75–5.25V). These advantages are beneficial for high-speed applications and designs requiring broader voltage margins. Both parts are ROHS3 compliant and actively manufactured.

Q: What is the significance of packaging designations (ATSOC, CTSOC, TSOC)?

A: These designations indicate temperature grade and packaging format. "A" typically denotes commercial temperature range (-40°C to 85°C), "C" indicates a different grade, and "T" or "TS" indicates tube or tape & reel packaging. All listed parts operate within -40°C to 85°C range. Packaging format affects ordering and handling but does not impact electrical compatibility.

Q: Is the original PI74FCT574ATS still available?

A: The PI74FCT574ATS is classified as obsolete. While 860 pcs are listed as in stock, this represents limited remaining inventory. Active substitute parts are recommended for new designs and ongoing procurement to ensure long-term availability and support.

Q: Do all substitute parts meet RoHS compliance?

A: All active substitute parts listed are ROHS3 compliant. The original PI74FCT574ATS is RoHS non-compliant. For applications requiring RoHS compliance, any of the active substitute parts satisfy this requirement.

Q: What is the impact of different quiescent current specifications?

A: The original part specifies 500 µA quiescent current, while most active substitutes specify 200–250 µA. Lower quiescent current reduces power consumption in standby conditions. This is a secondary consideration for most applications but becomes significant in battery-powered or low-power designs.

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