SN74AHCT273DBRG4 Equivalent & Substitute Parts

Part Overview

The SN74AHCT273DBRG4 is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit parallel data storage capability. This device is designed for synchronous data capture and storage applications in digital logic systems. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SN74AHCT273DBRG4

Texas InstrumentsIn Stock: 1044SN74AHCT273DBRG4 Datasheet

Current PartRFQ

SN74AHCT273DBR

Texas InstrumentsIn Stock: 7857SN74AHCT273DBR Datasheet

MFR RecommendedRFQ

74AHC273PW,118

Nexperia USA Inc.In Stock: 4611874AHC273PW,118 Datasheet

MFR RecommendedRFQ

74VHC273MTCX

onsemiIn Stock: 6261674VHC273MTCX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AHCT273DBRG4 is determined by the following critical parameters:

Core Functional Requirements:

• D-Type flip-flop architecture with 8-bit parallel storage
• Positive edge trigger operation
• Non-inverted output configuration
• Master reset function capability

Electrical Compatibility Criteria:

• Supply voltage range must encompass or match 4.5V ~ 5.5V
• Clock frequency minimum of 75 MHz
• Output drive capability of 8mA (high and low)
• Quiescent current of 4 µA
• Propagation delay characteristics within acceptable margins

Physical and Environmental Constraints:

• Surface mount packaging (SSOP or TSSOP variants acceptable)
• Operating temperature range of -40°C minimum to 85°C minimum
• RoHS3 compliance required
• MSL rating of 1 (Unlimited moisture sensitivity)

Substitute parts must maintain functional equivalence across all specified parameters while accommodating minor variations in package footprint dimensions and enhanced performance characteristics where applicable.

Parameter Comparison

Engineering Selection Recommendations

SN74AHCT273DBR (Texas Instruments)

This part is the direct functional equivalent to the SN74AHCT273DBRG4, maintaining identical electrical specifications and the same 20-SSOP package footprint. The primary distinction is packaging format (Tape & Reel versus bulk), with the DBR variant currently in active production status. This substitute provides the highest compatibility with existing PCB designs and is recommended for direct replacement without layout modifications. Extended operating temperature range to 125°C provides additional thermal margin.

74AHC273PW,118 (Nexperia USA Inc.)

This substitute operates within an expanded supply voltage range (2V ~ 5.5V) and features enhanced clock frequency capability (110 MHz versus 75 MHz). The 20-TSSOP package requires PCB footprint adjustment due to reduced body width (4.40mm versus 5.30mm). This part is suitable for applications where the narrower package footprint provides layout advantages and where the extended voltage range is beneficial. Extended operating temperature range to 125°C is supported.

74VHC273MTCX (onsemi)

This substitute shares the 20-TSSOP package format with the Nexperia option and provides equivalent clock frequency performance (110 MHz). Supply voltage range extends to 2V minimum, supporting low-voltage applications. Operating temperature range matches the original specification (-40°C ~ 85°C). This part is appropriate for designs requiring the compact TSSOP footprint with onsemi device availability.

All substitute parts maintain RoHS3 compliance and MSL rating of 1 (Unlimited), ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHCT273DBR be used as a direct replacement for the SN74AHCT273DBRG4?

A: Yes. Both parts share identical electrical specifications, the same 20-SSOP package footprint, and equivalent functional performance. The primary difference is product status (active versus discontinued) and packaging format. No PCB modifications are required.

Q: What are the key differences between the 20-SSOP and 20-TSSOP packages?

A: The 20-SSOP package measures 0.209" (5.30mm) in width, while the 20-TSSOP package measures 0.173" (4.40mm) in width. Both are surface mount packages with identical pin counts and pitch. PCB footprint redesign is necessary when transitioning between these package types.

Q: Are the 74AHC273PW,118 and 74VHC273MTCX suitable for 5V-only applications?

A: Yes. Both parts support the 4.5V ~ 5.5V supply range required by the original SN74AHCT273DBRG4. The extended lower voltage range (down to 2V) is an additional capability that does not affect 5V operation.

Q: What is the significance of the extended operating temperature range in the SN74AHCT273DBR and 74AHC273PW,118?

A: The SN74AHCT273DBR and 74AHC273PW,118 support operation to 125°C, compared to 85°C for the original part. This extended range provides additional thermal margin in applications with elevated ambient temperatures or high-density PCB layouts. For applications limited to 85°C maximum, this difference is not operationally significant.

Q: How do clock frequency differences affect substitution decisions?

A: The original SN74AHCT273DBRG4 operates at 75 MHz maximum. The 74AHC273PW,118 and 74VHC273MTCX support 110 MHz operation. Higher clock frequency capability does not create incompatibility; these parts function correctly at the original 75 MHz specification and below. Enhanced frequency performance provides design margin for future applications.

Q: What packaging considerations apply when selecting a substitute?

A: The SN74AHCT273DBR maintains the original 20-SSOP footprint, requiring no PCB changes. The 74AHC273PW,118 and 74VHC273MTCX use the narrower 20-TSSOP package, necessitating PCB footprint redesign. Package selection depends on available PCB real estate and manufacturing capabilities.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), meeting standard environmental and manufacturing requirements.