PI74FCT573ATQ D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The PI74FCT573ATQ is a D-Type Transparent Latch IC manufactured by Diodes Incorporated, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component operates within the 4.75V to 5.25V supply voltage range and is packaged in a 20-QSOP form factor. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

PI74FCT573ATQ

Diodes IncorporatedIn Stock: 6085PI74FCT573ATQ Datasheet

Current PartRFQ

CY74FCT573ATQCT

Cypress Semiconductor CorpIn Stock: 1946CY74FCT573ATQCT Datasheet

DirectRFQ

CY74FCT2573ATQCT

Texas InstrumentsIn Stock: 1641CY74FCT2573ATQCT Datasheet

MFR RecommendedRFQ

CY74FCT2573CTQCT

Texas InstrumentsIn Stock: 1087CY74FCT2573CTQCT Datasheet

MFR RecommendedRFQ

CY74FCT573CTQCT

Texas InstrumentsIn Stock: 912CY74FCT573CTQCT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI74FCT573ATQ is determined by strict alignment across the following critical parameters:

• Logic Type & Circuit Configuration: All substitutes must be D-Type Transparent Latch ICs with 8:8 circuit configuration
• Output Type: Tri-state output capability is mandatory
• Supply Voltage Range: 4.75V ~ 5.25V compatibility required
• Independent Circuits: Single channel (1) configuration
• Operating Temperature Range: -40°C ~ 85°C minimum requirement
• Mounting Type & Package: Surface mount in 20-SSOP/QSOP form factor (0.154", 3.90mm Width)
• Series Compatibility: 74FCT or 74FCT2573 series devices

The substitute parts identified—CY74FCT573ATQCT, CY74FCT2573ATQCT, CY74FCT2573CTQCT, and CY74FCT573CTQCT—meet all mandatory electrical and mechanical parameters. Variations in propagation delay time (1.5ns to 2ns) and output current specifications (15mA to 32mA for high, 12mA to 64mA for low) remain within acceptable operational tolerances for latch functionality.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: CY74FCT2573ATQCT or CY74FCT2573CTQCT (Texas Instruments)

Both Texas Instruments variants offer ROHS3 compliance and active product status, providing long-term supply chain stability. The CY74FCT2573ATQCT is supplied in Cut Tape (CT) packaging, while CY74FCT2573CTQCT is supplied in Tape & Reel (TR) format. Both maintain the 1.5ns propagation delay specification matching the original PI74FCT573ATQ and support equivalent output current characteristics (15mA high, 12mA low).

Secondary Recommendation: CY74FCT573ATQCT (Cypress Semiconductor)

This Cypress variant maintains active product status and is available in bulk packaging. While propagation delay extends to 2ns and output high current increases to 32mA, these parameters remain functionally compatible with the original specification. This option is suitable for applications where timing margins accommodate the extended delay.

Tertiary Option: CY74FCT573CTQCT (Texas Instruments)

This Texas Instruments part offers ROHS3 compliance and active status but exhibits 2ns propagation delay and 32mA output high current. Selection of this variant should be limited to applications where the increased propagation delay does not impact system timing requirements.

All substitute parts maintain electrical and mechanical compatibility with the obsolete PI74FCT573ATQ across supply voltage, operating temperature, circuit configuration, and package form factor.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT2573ATQCT directly replace PI74FCT573ATQ in existing designs?

A: Yes. Both parts share identical supply voltage (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), circuit configuration (8:8), output type (tri-state), and package form factor (20-SSOP). The CY74FCT2573ATQCT maintains the 1.5ns propagation delay of the original part, ensuring timing compatibility.

Q: What is the difference between the Cypress CY74FCT573ATQCT and Texas Instruments CY74FCT2573ATQCT?

A: Both are functionally equivalent D-Type Transparent Latch ICs with 8:8 configuration. The primary differences are manufacturer (Cypress vs. Texas Instruments), base product number (74FCT573 vs. 74FCT2573), and compliance status. The Texas Instruments variant includes ROHS3 compliance and 1.5ns propagation delay, while the Cypress part has 2ns propagation delay.

Q: Are there packaging differences between substitute options?

A: Yes. CY74FCT573ATQCT is supplied in bulk packaging. CY74FCT2573ATQCT is supplied in Cut Tape (CT). CY74FCT2573CTQCT is supplied in Tape & Reel (TR). All three maintain the identical 20-SSOP physical form factor (0.154", 3.90mm Width) and are surface mount compatible.

Q: Does propagation delay variation between 1.5ns and 2ns affect compatibility?

A: Propagation delay differences of 0.5ns between substitute options remain within typical system timing margins for latch applications. Selection should be based on specific circuit timing requirements. The CY74FCT2573 variants (1.5ns) provide exact delay matching to the original PI74FCT573ATQ.

Q: What is the significance of RoHS compliance for substitute selection?

A: The original PI74FCT573ATQ is RoHS non-compliant. Texas Instruments substitutes (CY74FCT2573ATQCT, CY74FCT2573CTQCT, CY74FCT573CTQCT) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and manufacturing processes. This is a key consideration for applications subject to RoHS directives.

Q: Can I use CY74FCT573CTQCT as a substitute if timing is not critical?

A: Yes, for non-timing-critical applications. This part meets all electrical and mechanical requirements but exhibits 2ns propagation delay and 32mA output high current. Confirm that your circuit design accommodates these specifications before implementation.