PI74FCT373ATQ Equivalent & Substitute Parts

Part Overview

The PI74FCT373ATQ is a D-Type Transparent Latch logic IC manufactured by Diodes Incorporated, featuring an 8:8 circuit configuration with tri-state output capability in a 20-QSOP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74FCT373 series provides a standardized logic function across multiple manufacturers, enabling direct functional replacement when electrical and mechanical parameters align.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT373ATQ
Manufacturer	Diodes Incorporated
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	4.75V ~ 5.25V
Operating Temperature Range	-40°C ~ 85°C
Package Type	20-QSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the PI74FCT373ATQ is determined by the following critical parameters:

Logic Function: All substitutes must implement D-Type Transparent Latch 8:8 circuit configuration
Supply Voltage: All substitutes must operate within 4.75V ~ 5.25V range
Output Type: Tri-state output capability is required
Operating Temperature: All substitutes must support -40°C ~ 85°C range
Package Compatibility: Physical package dimensions and pin configuration must match or be mechanically compatible
Mounting Type: Surface mount requirement must be maintained

The three identified substitute parts meet these core substitution criteria while maintaining functional equivalence to the original PI74FCT373ATQ.

Parameter Comparison

Parameter	PI74FCT373ATQ (Original)	74FCT373CTPYG (IDT)	74FCT373CTQG (IDT)	CY74FCT373ATQCT (TI)
Manufacturer	Diodes Incorporated	IDT	IDT	Texas Instruments
Logic Type	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch
Circuit Configuration	8:8	8:8	8:8	8:8
Output Type	Tri-State	Tri-State	Tri-State	Tri-State
Supply Voltage Range	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
Propagation Delay	1.5ns	2ns	2ns	2ns
Output Current - High	15mA	15mA	15mA	32mA
Output Current - Low	64mA	48mA	48mA	64mA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-QSOP (0.154", 3.90mm)	20-SSOP (0.209", 5.30mm)	20-QSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	Not specified	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

74FCT373CTQG (IDT) provides the closest electrical and mechanical match to the PI74FCT373ATQ. This part maintains identical package dimensions (20-QSOP, 0.154", 3.90mm width) and pin configuration, enabling direct board-level substitution without layout modifications. The part is currently in active production status, ensuring long-term availability and supply chain stability.

CY74FCT373ATQCT (Texas Instruments) offers enhanced output current capability (32mA high, 64mA low) and ROHS3 compliance certification, making it suitable for applications requiring environmental compliance or higher drive current specifications. The package dimensions are compatible with the original design (20-SSOP, 0.154", 3.90mm width).

74FCT373CTPYG (IDT) uses a wider 20-SSOP package (0.209", 5.30mm width) and is not recommended for direct board-level substitution without PCB layout redesign. This part is suitable only when package footprint modifications are acceptable.

All three substitutes maintain the required supply voltage range (4.75V ~ 5.25V) and operating temperature range (-40°C ~ 85°C), ensuring functional compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 74FCT373CTQG directly replace the PI74FCT373ATQ without PCB modifications?

A: Yes. The 74FCT373CTQG maintains identical package dimensions and pin configuration (20-QSOP, 0.154", 3.90mm width), enabling direct board-level substitution without layout changes.

Q: What is the difference between the 74FCT373CTPYG and 74FCT373CTQG packages?

A: The 74FCT373CTPYG uses a 20-SSOP package with 0.209" width (5.30mm), while the 74FCT373CTQG uses a 20-QSOP package with 0.154" width (3.90mm). These are different physical packages and are not interchangeable without PCB redesign.

Q: Are all substitute parts electrically compatible with the original PI74FCT373ATQ?

A: All three substitutes maintain the same supply voltage range (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), logic function (D-Type Transparent Latch 8:8), and tri-state output configuration. Propagation delay and output current specifications vary slightly but remain within acceptable operating parameters for 74FCT373 series applications.

Q: Which substitute part offers the best compliance certification?

A: The CY74FCT373ATQCT from Texas Instruments carries ROHS3 compliance certification, making it the preferred choice for applications requiring environmental compliance documentation.

Q: What is the significance of the "Active" product status for substitute parts?

A: Active product status indicates current manufacturing and ongoing availability from the manufacturer. This ensures reliable long-term supply chain access, unlike the obsolete PI74FCT373ATQ, which is no longer in production.

Q: Do the substitute parts have different output current ratings?

A: Yes. The CY74FCT373ATQCT provides higher output current capability (32mA high, 64mA low) compared to the IDT alternatives (15mA high, 48mA low). The original PI74FCT373ATQ specifies 15mA high and 64mA low. Verify that your circuit design can accommodate these variations.

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