74ACT273SCX Equivalent & Substitute Parts

Part Overview

The 74ACT273SCX is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit configuration and positive edge triggering. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74ACT273 series provides master reset functionality with non-inverted outputs in a 20-SOIC surface mount package. Substitute parts maintain functional equivalence while offering improved availability and active product status.

Substiute Parts

74ACT273SCX

onsemiIn Stock: 241874ACT273SCX Datasheet

Current PartRFQ

MC74ACT273DWR2G

onsemiIn Stock: 2342MC74ACT273DWR2G Datasheet

DirectRFQ

MC74ACT273DWG

onsemiIn Stock: 2296MC74ACT273DWG Datasheet

SimilarRFQ

74AHCT273D,118

Nexperia USA Inc.In Stock: 286974AHCT273D,118 Datasheet

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CD74ACT273M96

Texas InstrumentsIn Stock: 1481CD74ACT273M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT273SCX are grouped based on the following critical parameters that determine functional compatibility:

• Logic Function: D-Type flip-flop with 1 element, 8-bit configuration, master reset capability
• Output Configuration: Non-inverted outputs
• Trigger Mechanism: Positive edge triggering
• Package Type: 20-SOIC surface mount package with 0.295" (7.50mm) width
• Supply Voltage Range: 4.5V ~ 5.5V
• Operating Temperature Range: Minimum -40°C lower bound
• Mounting Type: Surface mount

All substitute parts listed maintain these core parameters. Variations in clock frequency, propagation delay, quiescent current, and output current are secondary performance characteristics that do not affect functional substitution within the specified electrical and thermal operating envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (onsemi Manufacturer)

MC74ACT273DWR2G and MC74ACT273DWG are direct onsemi alternatives to the obsolete 74ACT273SCX. Both parts maintain the 74ACT series designation and are active products with ROHS3 compliance. MC74ACT273DWR2G is supplied in Tape & Reel packaging, while MC74ACT273DWG is supplied in Tube packaging. Selection between these two depends on procurement and assembly requirements.

Alternative Substitute (Nexperia USA Inc.)

74AHCT273D,118 is a Nexperia product from the 74AHCT series. This part maintains functional compatibility with identical logic configuration and package type. The 74AHCT series operates at lower clock frequency (75 MHz) and reduced output current (8mA) compared to the 74ACT series. This part features unlimited moisture sensitivity level (MSL 1) and extended operating temperature range to 125°C.

Extended Temperature Substitute (Texas Instruments)

CD74ACT273M96 is a Texas Instruments 74ACT series part offering the widest operating temperature range (-55°C ~ 125°C). This part maintains 74ACT series electrical characteristics and is ROHS3 compliant with unlimited moisture sensitivity level. Clock frequency is reduced to 80 MHz and propagation delay is increased to 14.6ns.

All substitute parts are active products with current availability and comply with REACH and EAR99 export classifications.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT273DWR2G directly replace 74ACT273SCX in existing designs?

A: Yes. MC74ACT273DWR2G maintains identical logic function, package type (20-SOIC), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). The part is pin-compatible and functionally equivalent. The primary difference is active product status and improved quiescent current (8 µA vs. 40 µA).

Q: What is the difference between MC74ACT273DWR2G and MC74ACT273DWG?

A: Both parts are electrically identical onsemi 74ACT273 devices. The difference is packaging format: MC74ACT273DWR2G is supplied in Tape & Reel (TR) format for automated assembly, while MC74ACT273DWG is supplied in Tube format for manual handling and lower-volume applications.

Q: Why does 74AHCT273D,118 have lower clock frequency than the original part?

A: 74AHCT273D,118 is from the 74AHCT logic family, which operates at different electrical specifications than the 74ACT family. The 75 MHz clock frequency is a characteristic of the 74AHCT series design. Despite lower clock frequency, this part maintains functional compatibility for D-type flip-flop operation with positive edge triggering and master reset capability.

Q: Is CD74ACT273M96 suitable for high-temperature applications?

A: CD74ACT273M96 supports operating temperatures from -55°C to 125°C, providing extended temperature range compared to the original 74ACT273SCX (-40°C ~ 85°C). This part is suitable for applications requiring operation above 85°C.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original 74ACT273SCX RoHS status is not specified in available documentation.

Q: What is the moisture sensitivity level (MSL) difference, and does it matter?

A: MC74ACT273DWR2G and MC74ACT273DWG have MSL 3 (168 hours), requiring controlled storage and handling. 74AHCT273D,118 and CD74ACT273M96 have MSL 1 (unlimited), allowing standard storage conditions. MSL affects component shelf life and handling procedures during assembly. Selection depends on manufacturing environment and storage capabilities.

Q: Can I use 74AHCT273D,118 in a design originally specified for 74ACT273SCX?

A: 74AHCT273D,118 is functionally compatible as a D-type flip-flop with identical package and logic configuration. However, the 74AHCT series has reduced output current (8mA vs. 24mA) and lower clock frequency (75 MHz vs. 189 MHz). Designs with high-current output requirements or high-frequency timing constraints may require circuit evaluation.