PI74FCT273ATS Equivalent & Substitute Parts

Part Overview

The PI74FCT273ATS is an 8-bit D-type flip-flop logic integrated circuit manufactured by Diodes Incorporated in a 20-SOIC surface mount package. This device functions as a master reset flip-flop with positive edge triggering and non-inverted outputs, operating at 5V logic levels with a maximum propagation delay of 7.2ns at 5V with 50pF load.

The PI74FCT273ATS is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems utilizing this component.

Substiute Parts

PI74FCT273ATS

Diodes IncorporatedIn Stock: 2024PI74FCT273ATS 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

SN74ABT273DWR

Texas InstrumentsIn Stock: 8569SN74ABT273DWR Datasheet

MFR RecommendedRFQ

SN74LS273DWR

Texas InstrumentsIn Stock: 3092SN74LS273DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PI74FCT273ATS is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

• Package type: 20-SOIC (0.295", 7.50mm Width) — physical and electrical pin compatibility
• Function: Master Reset D-Type flip-flop
• Number of elements: 1
• Number of bits per element: 8
• Output type: Non-inverted
• Trigger type: Positive edge
• Voltage supply range: Must encompass or be compatible with 4.5V ~ 5.5V
• Operating temperature range: Must support -40°C ~ 85°C or be suitable for the application's temperature requirements
• Mounting type: Surface mount

Electrical Performance Parameters:

• Maximum propagation delay at specified voltage and load
• Output current drive capability (High and Low)
• Quiescent current consumption
• Input capacitance

All substitute parts listed maintain identical package geometry, pinout, and functional characteristics. Differences in propagation delay, quiescent current, and output drive capability are documented to enable selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Status with RoHS3 Compliance:

The CY74FCT273 series from Texas Instruments (CY74FCT273ATSOC, CY74FCT273ATSOCT, CY74FCT273CTSOC, CY74FCT273TSOC, CY74FCT273TSOCT) are active products with ROHS3 compliance. These parts maintain the 74FCT series electrical characteristics and support the full -40°C ~ 85°C operating temperature range of the original PI74FCT273ATS. Selection among these variants depends on packaging requirements (tube, cut tape, or tape & reel) and propagation delay specifications.

For Extended Temperature Range with Wider Supply Voltage:

The SN74ABT273DWR from Texas Instruments offers active product status, ROHS3 compliance, and maintains the 4.5V ~ 5.5V supply voltage range of the original part. This 74ABT series device provides superior propagation delay performance (6.8ns) and supports the full -40°C ~ 85°C operating temperature range.

For Obsolete Product Replacement:

The CD74FCT273M from Harris Corporation is also obsolete but remains available in inventory. This part is suitable only for applications where RoHS compliance is not required and where the narrower operating temperature range (0°C ~ 70°C) is acceptable.

For Legacy Systems with Relaxed Performance Requirements:

The SN74LS273DWR from Texas Instruments is an active product with ROHS3 compliance. However, this 74LS series device exhibits significantly higher propagation delay (27ns) and quiescent current (27mA), making it suitable only for applications where performance degradation is acceptable and operating temperature does not exceed 70°C.

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT273ATSOC directly replace the PI74FCT273ATS?

A: Yes. Both parts share identical 20-SOIC package geometry, pinout, function (Master Reset D-Type flip-flop with 8-bit configuration), and electrical characteristics including 7.2ns propagation delay at 5V with 50pF load. The CY74FCT273ATSOC is an active product with ROHS3 compliance, whereas the PI74FCT273ATS is obsolete and RoHS non-compliant.

Q: What is the difference between CY74FCT273ATSOC, CY74FCT273ATSOCT, and CY74FCT273CTSOC?

A: These three parts are electrically identical 74FCT series devices from Texas Instruments with identical propagation delay (7.2ns or 5.8ns for the CTSOC variant) and operating temperature range (-40°C ~ 85°C). The differences are packaging format: ATSOC is tube packaging, ATSOCT is cut tape & Digi-Reel, and CTSOC is tube packaging with faster propagation delay (5.8ns).

Q: Why does the SN74LS273DWR have higher quiescent current?

A: The SN74LS273DWR belongs to the 74LS logic family, which uses different internal circuit topology than the 74FCT family. The 74LS series exhibits higher quiescent current (27mA) and slower propagation delay (27ns) as inherent characteristics of the technology. This part is suitable only for applications where performance degradation is acceptable.

Q: Is the CD74FCT273M from Harris Corporation a suitable replacement?

A: The CD74FCT273M maintains 74FCT series electrical characteristics and identical package geometry. However, it is obsolete and RoHS non-compliant. Additionally, its operating temperature range is limited to 0°C ~ 70°C, which does not support the full -40°C ~ 85°C range of the original PI74FCT273ATS. Use only if legacy inventory is available and application temperature requirements do not exceed 70°C.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: identical 20-SOIC package and pinout, Master Reset D-Type flip-flop function with 8-bit configuration, non-inverted output type, positive edge triggering, compatible supply voltage range (4.5V ~ 5.5V or 4.75V ~ 5.25V), and operating temperature range support. Propagation delay, output current drive, and quiescent current may vary within acceptable limits depending on application requirements.

Q: Can I use the SN74ABT273DWR in place of the PI74FCT273ATS?

A: Yes. The SN74ABT273DWR is a 74ABT series device with identical 20-SOIC package, Master Reset D-Type flip-flop function, 8-bit configuration, and full -40°C ~ 85°C operating temperature support. It maintains the 4.5V ~ 5.5V supply voltage range and offers superior propagation delay (6.8ns). It is an active product with ROHS3 compliance.

Q: What packaging options are available for the CY74FCT273 series?

A: Texas Instruments offers the CY74FCT273 in three packaging formats: tube (ATSOC, CTSOC, TSOC), cut tape & Digi-Reel (ATSOCT), and tape & reel (TSOCT). All variants maintain identical electrical characteristics and 20-SOIC package geometry. Selection depends on procurement and assembly requirements.