74ACT273PC Equivalent & Substitute Parts

Part Overview

The 74ACT273PC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, designed for 8-bit parallel data storage with positive edge triggering. This component features a master reset function and non-inverted outputs, operating within the 4.5V to 5.5V supply voltage range. The part is classified as obsolete, making identification of functionally equivalent substitutes necessary for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

74ACT273PC

onsemiIn Stock: 102074ACT273PC Datasheet

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CD74ACT273E

Harris CorporationIn Stock: 1249CD74ACT273E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT273PC is determined by strict equivalence across the following critical parameters:

Functional Equivalence Criteria:

• Type: D-Type flip-flop architecture
• Number of Elements: 1
• Number of Bits per Element: 8
• Function: Master Reset capability
• Output Type: Non-Inverted
• Trigger Type: Positive Edge

Electrical Compatibility Criteria:

• Voltage - Supply: 4.5V ~ 5.5V range
• Package / Case: 20-DIP (0.300", 7.62mm) form factor
• Mounting Type: Through Hole

Performance Tolerance Criteria: Substitute parts must maintain functional operation within the specified supply voltage and temperature ranges. Variations in clock frequency, propagation delay, quiescent current, and input capacitance are permissible provided the substitute part meets the minimum functional requirements of the application circuit.

The CD74ACT273E qualifies as a direct substitute based on matching all functional equivalence and electrical compatibility criteria, despite variations in performance specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the 74ACT273PC and CD74ACT273E are classified as obsolete products. Selection between these parts should be based on application-specific requirements and availability constraints.

The 74ACT273PC offers superior clock frequency performance (189 MHz versus 85 MHz) and faster propagation delay (8.5 ns versus 14.6 ns), making it suitable for timing-critical applications. The CD74ACT273E provides an extended operating temperature range (-55°C to 125°C versus -40°C to 85°C) and lower quiescent current consumption (8 µA versus 40 µA), advantageous for wide-temperature or low-power applications.

The CD74ACT273E is RoHS non-compliant, while the 74ACT273PC status regarding RoHS compliance is not specified in the provided data. Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT273E directly replace the 74ACT273PC in existing designs?

A: Yes, the CD74ACT273E is functionally equivalent for applications where the reduced clock frequency (85 MHz) and increased propagation delay (14.6 ns) are acceptable. Both parts share identical package geometry (20-DIP), mounting type (Through Hole), and core functional specifications (8-bit D-Type flip-flop with master reset and positive edge triggering).

Q: What are the key differences between these two parts?

A: The primary differences are clock frequency (189 MHz vs. 85 MHz), propagation delay (8.5 ns vs. 14.6 ns), quiescent current (40 µA vs. 8 µA), input capacitance (4.5 pF vs. 10 pF), and operating temperature range (-40°C to 85°C vs. -55°C to 125°C). Both maintain identical supply voltage requirements (4.5V to 5.5V) and output drive capability (24 mA).

Q: Are there any compliance or regulatory differences?

A: The CD74ACT273E is documented as RoHS non-compliant. The 74ACT273PC RoHS status is not specified. Both parts are classified as REACH Unaffected (74ACT273PC) or not specified (CD74ACT273E) and carry identical export control classifications (EAR99).

Q: Which part should be selected for new designs?

A: Both parts are obsolete. For new designs, evaluation of current-generation D-Type flip-flop alternatives from active product lines is recommended. If legacy compatibility is mandatory, selection should be based on the specific timing and temperature requirements of the application circuit.

Q: Are the package dimensions identical?

A: Yes, both parts use the 20-DIP (0.300", 7.62mm) package with Through Hole mounting, ensuring mechanical and electrical compatibility at the board level.