PI74FCT374ATQ Equivalent & Substitute Parts

Part Overview

The PI74FCT374ATQ is an 8-bit D-type flip-flop logic integrated circuit manufactured by Diodes Incorporated in a 20-SSOP surface mount package. This component functions as a standard octal D-type register with tri-state, non-inverted outputs, designed for positive edge-triggered operation. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT374ATQ
Manufacturer	Diodes Incorporated
Category	Logic
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)
Mounting Type	Surface Mount
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the PI74FCT374ATQ are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Series: 74FCT (standard logic family)
Type: D-Type Flip Flop with 8-bit configuration
Output Type: Tri-State, Non-Inverted
Trigger Type: Positive Edge
Package / Case: 20-SSOP (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: -40°C ~ 85°C (TA)

All identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional and physical compatibility in existing circuit designs.

Parameter Comparison

Parameter	PI74FCT374ATQ	CY74FCT374ATQCT	CY74FCT374TQCT
Manufacturer	Diodes Incorporated	Cypress Semiconductor Corp	Texas Instruments
Series	74FCT	74FCT	74FCT
Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1
Number of Bits per Element	8	8	8
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Max Propagation Delay @ V, Max CL	6.5ns @ 5V, 50pF	6.2ns @ 50pF	10ns @ 5V, 50pF
Current - Output High, Low	15mA, 64mA	32mA, 64mA	32mA, 64mA
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Current - Quiescent (Iq)	500 µA	200 µA	200 µA
Input Capacitance	6 pF	5 pF	5 pF
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	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
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

CY74FCT374ATQCT (Cypress Semiconductor Corp): This substitute maintains active product status and demonstrates improved electrical performance characteristics. Propagation delay is reduced to 6.2ns, quiescent current is lowered to 200 µA, and output high current is increased to 32mA. The part is supplied in Bulk packaging and shares identical mechanical compatibility with the original PI74FCT374ATQ.

CY74FCT374TQCT (Texas Instruments): This substitute is actively manufactured and supplied in Tape & Reel packaging. It meets all core electrical and mechanical specifications. Propagation delay is specified at 10ns, which is within acceptable tolerance for most 74FCT applications. Quiescent current is 200 µA, and output drive capability matches the Cypress alternative at 32mA high current. This part carries RoHS3 compliance certification, whereas the original PI74FCT374ATQ is RoHS non-compliant.

Both substitute parts provide functional equivalence and are suitable for direct replacement in designs currently using the obsolete PI74FCT374ATQ, with selection based on packaging preference, compliance requirements, and performance specifications.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT374ATQCT and CY74FCT374TQCT be used interchangeably with PI74FCT374ATQ?

A: Yes. Both substitute parts maintain identical electrical specifications for supply voltage (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), package type (20-SSOP), and functional configuration (8-bit D-type flip-flop with tri-state, non-inverted outputs). Physical and electrical compatibility is assured.

Q: What are the performance differences between the substitute parts?

A: CY74FCT374ATQCT offers the fastest propagation delay at 6.2ns. CY74FCT374TQCT specifies 10ns propagation delay. Both substitutes reduce quiescent current to 200 µA compared to the original 500 µA. Output high current is increased to 32mA in both substitutes versus 15mA in the original part.

Q: Does packaging format affect compatibility?

A: No. Both substitutes use the same 20-SSOP (0.154", 3.90mm Width) surface mount package as the original PI74FCT374ATQ. Packaging format differences (Bulk versus Tape & Reel) relate to supply and handling only, not electrical or mechanical compatibility.

Q: Are there compliance differences between the options?

A: Yes. CY74FCT374TQCT carries RoHS3 compliance certification. The original PI74FCT374ATQ and CY74FCT374ATQCT are RoHS non-compliant. All three parts are REACH Unaffected and classified under ECCN EAR99.

Q: Which substitute should be selected for new designs?

A: Selection depends on design requirements. For maximum performance, CY74FCT374ATQCT provides the lowest propagation delay and reduced power consumption. For RoHS-compliant applications, CY74FCT374TQCT is the appropriate choice. Both parts are actively manufactured and provide long-term supply security.

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