PI74FCT273TSE Equivalent & Substitute Parts

Part Overview

The PI74FCT273TSE is a D-type flip-flop logic integrated circuit manufactured by Diodes Incorporated, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74FCT273 series represents a standard logic family for digital applications requiring edge-triggered flip-flop functionality. Substitute parts must maintain electrical compatibility across supply voltage, propagation delay, output current ratings, and thermal operating ranges to ensure direct replacement capability.

Substiute Parts

PI74FCT273TSE

Diodes IncorporatedIn Stock: 947PI74FCT273TSE Datasheet

Current PartRFQ

CD74FCT273M

Harris CorporationIn Stock: 7284CD74FCT273M Datasheet

MFR RecommendedRFQ

CY74FCT273ATSOC

Texas InstrumentsIn Stock: 1878CY74FCT273ATSOC Datasheet

MFR RecommendedRFQ

CY74FCT273ATSOCT

Texas InstrumentsIn Stock: 1668CY74FCT273ATSOCT Datasheet

MFR RecommendedRFQ

CY74FCT273CTSOC

Texas InstrumentsIn Stock: 3421CY74FCT273CTSOC Datasheet

MFR RecommendedRFQ

CY74FCT273TSOC

Texas InstrumentsIn Stock: 1298CY74FCT273TSOC Datasheet

MFR RecommendedRFQ

CY74FCT273TSOCT

Texas InstrumentsIn Stock: 4069CY74FCT273TSOCT Datasheet

MFR RecommendedRFQ

SN74ABT273DW

Texas InstrumentsIn Stock: 3508SN74ABT273DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI74FCT273TSE is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 20-SOIC (0.295", 7.50mm Width) surface mount package to ensure PCB footprint compatibility.

Electrical Specifications: Substitute parts must operate within the supply voltage range of 4.5V to 5.5V. Propagation delay specifications must not exceed the maximum of 13ns at 5V with 50pF load. Output current ratings (high and low) must meet or exceed the original specifications of 15mA and 64mA respectively.

Functional Equivalence: All substitute parts must maintain D-type flip-flop architecture with 1 element, 8-bit configuration, positive edge triggering, and master reset function with non-inverted output.

Thermal Range: Operating temperature range must encompass -40°C to 85°C to maintain compatibility with the original part's environmental specifications.

Substitute parts are grouped into two categories: active product status parts from Texas Instruments (CY74FCT273 series variants and SN74ABT273DW) and the obsolete CD74FCT273M from Harris Corporation. The Texas Instruments variants provide modern alternatives with improved availability and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Active Status Parts: The Texas Instruments CY74FCT273 series variants (CY74FCT273ATSOC, CY74FCT273ATSOCT, CY74FCT273CTSOC, CY74FCT273TSOC, CY74FCT273TSOCT) are preferred substitutes due to active product status, ROHS3 compliance, and extended thermal operating range (-40°C to 85°C). These parts maintain full electrical compatibility with the PI74FCT273TSE within the specified parameter envelope.

Alternative - Enhanced Performance: The SN74ABT273DW from Texas Instruments offers superior propagation delay performance (6.8ns) and higher clock frequency capability (150 MHz) while maintaining ROHS3 compliance and the full -40°C to 85°C operating range. This part is suitable for applications requiring improved timing margins.

Secondary Option - Obsolete Compatibility: The CD74FCT273M from Harris Corporation provides electrical compatibility but operates within a narrower supply voltage range (4.75V to 5.25V) and restricted thermal range (0°C to 70°C). This part is not recommended for new designs due to obsolete status and RoHS non-compliance.

Packaging Considerations: Select substitute parts based on required packaging format: tube packaging for standard applications, tape and reel (TR) for high-volume automated assembly, or cut tape (CT) for mixed-volume procurement.

Frequently Asked Questions (FAQ)

Q: Can the PI74FCT273TSE be directly replaced with any CY74FCT273 variant?

A: Yes, all CY74FCT273 variants from Texas Instruments (ATSOC, ATSOCT, CTSOC, TSOC, TSOCT) are direct substitutes. They share identical package geometry, functional architecture, and electrical specifications within the allowed parameter ranges. Selection between variants depends on packaging format requirements (tube, tape and reel, or cut tape).

Q: What is the difference between CY74FCT273CTSOC and CY74FCT273TSOC?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is propagation delay: CY74FCT273CTSOC specifies 5.8ns maximum delay, while CY74FCT273TSOC specifies 13ns maximum delay. Both meet the PI74FCT273TSE requirement of 13ns maximum. Selection depends on timing margin requirements in the application.

Q: Is the SN74ABT273DW compatible with the PI74FCT273TSE?

A: The SN74ABT273DW is electrically compatible and operates within the same thermal range (-40°C to 85°C). However, it belongs to the 74ABT series rather than 74FCT. It offers improved propagation delay (6.8ns) and higher clock frequency (150 MHz). Compatibility is confirmed for applications where these enhanced specifications do not create timing conflicts with existing circuit design.

Q: Why does the CD74FCT273M have a narrower operating temperature range?

A: The CD74FCT273M is an obsolete part from Harris Corporation with specifications limited to 0°C to 70°C. This narrower range restricts its use to applications not requiring the full -40°C to 85°C industrial temperature range. For designs requiring extended temperature operation, Texas Instruments variants are required.

Q: What packaging format should be selected for high-volume production?

A: For high-volume automated assembly, select tape and reel (TR) packaging variants such as CY74FCT273ATSOCT or CY74FCT273TSOCT. For lower-volume or mixed-component applications, tube packaging variants (ATSOC, CTSOC, TSOC) are appropriate.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments variants (CY74FCT273 series and SN74ABT273DW) are ROHS3 compliant. The CD74FCT273M from Harris Corporation is not RoHS compliant and should not be used in applications requiring RoHS certification.

Q: Can the PI74FCT273TSE be used interchangeably with SN74ABT273DW in existing designs?

A: The SN74ABT273DW is a functional substitute with superior performance characteristics. However, the 74ABT series has different internal architecture than 74FCT. Verification of timing margins and signal integrity is required before substitution in existing designs, particularly in applications with tight timing constraints.