PI74FCT574ATQ Equivalent & Substitute Parts

Part Overview

The PI74FCT574ATQ is a D-type flip-flop logic integrated circuit manufactured by Diodes Incorporated, designed for 8-bit data storage and transfer applications. This device features tri-state, non-inverted outputs and operates on a 4.75V to 5.25V supply voltage with positive edge triggering. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring compatible 74FCT series logic devices.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT574ATQ
Manufacturer	Diodes Incorporated
Series	74FCT
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Package / Case	20-SSOP (0.154", 3.90mm Width)
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the PI74FCT574ATQ are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Compatibility Criteria:

Series: 74FCT logic family
Type: D-Type flip-flop configuration
Number of Elements: 1
Number of Bits per Element: 8
Output Type: Tri-State, Non-Inverted
Trigger Type: Positive Edge
Package / Case: 20-SSOP (0.154", 3.90mm Width)
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount

All identified substitute parts meet these core requirements. Variations in propagation delay, output current ratings, quiescent current, and input capacitance represent performance enhancements or different speed grades within the same functional family, allowing selection based on specific application requirements.

Parameter Comparison

Parameter	PI74FCT574ATQ	CY74FCT2574ATQCT	CY74FCT2574CTQCT	CY74FCT574ATQCT	CY74FCT574CTQCT	CY74FCT574TQCT
Manufacturer	Diodes Incorporated	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Series	74FCT	74FCT	74FCT	74FCT	74FCT	74FCT
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1
Number of Bits per Element	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	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
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-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
Max Propagation Delay @ V, Max CL	6.5ns @ 5V, 50pF	6.5ns @ 50pF	5.2ns @ 5V, 50pF	6.2ns @ 50pF	5.2ns @ 50pF	6.2ns @ 50pF
Current - Output High, Low	15mA, 64mA	15mA, 12mA	15mA, 12mA	32mA, 64mA	32mA, 64mA	32mA, 64mA
Current - Quiescent (Iq)	500 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
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

All five substitute parts are active products from Texas Instruments, providing long-term availability and supply chain stability compared to the obsolete PI74FCT574ATQ. All substitutes achieve ROHS3 compliance, meeting current environmental and regulatory requirements.

Selection by Performance Grade:

CY74FCT2574CTQCT and CY74FCT574CTQCT offer the fastest propagation delay at 5.2ns, suitable for timing-critical applications. CY74FCT2574ATQCT, CY74FCT574ATQCT, and CY74FCT574TQCT provide 6.2ns to 6.5ns propagation delay, matching the original part's timing characteristics.

Selection by Output Current:

CY74FCT2574ATQCT and CY74FCT2574CTQCT provide reduced output current (15mA high, 12mA low), suitable for low-power applications. CY74FCT574ATQCT, CY74FCT574CTQCT, and CY74FCT574TQCT maintain higher output current (32mA high, 64mA low), matching the original part's drive capability.

All substitutes feature improved quiescent current (200 µA versus 500 µA) and reduced input capacitance (5 pF versus 6 pF), representing performance enhancements over the original design.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI74FCT574ATQ with any of these substitute parts?

A: Yes. All substitute parts share identical functional specifications, package type (20-SSOP), supply voltage range (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), and logic family (74FCT). Pin-to-pin compatibility is maintained across all parts.

Q: What is the difference between CY74FCT574 and CY74FCT2574 variants?

A: Both are functionally equivalent D-type flip-flops with 8-bit configuration. The CY74FCT2574 variants feature reduced output current (12mA low) compared to CY74FCT574 variants (64mA low), making them suitable for applications with lower current requirements.

Q: Which substitute offers the best performance?

A: CY74FCT2574CTQCT and CY74FCT574CTQCT provide the fastest propagation delay at 5.2ns. Selection depends on application requirements for speed, output current, and power consumption.

Q: Are all substitutes RoHS compliant?

A: Yes. All five substitute parts are ROHS3 compliant, whereas the original PI74FCT574ATQ is RoHS non-compliant. This makes the substitutes suitable for applications requiring environmental compliance.

Q: What is the packaging difference?

A: All parts use identical 20-SSOP (0.154", 3.90mm Width) surface mount packaging. No PCB layout modifications are required for substitution.

Q: Why is the original part obsolete?

A: The PI74FCT574ATQ is classified as obsolete by Diodes Incorporated. The Texas Instruments CY74FCT series variants provide active, supported alternatives with improved specifications and compliance certifications.

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