74AC273PC Equivalent & Substitute Parts

Part Overview

The 74AC273PC is a D-Type flip-flop integrated circuit manufactured by onsemi, designed for 8-bit parallel data storage with positive edge triggering. This component features a master reset function and operates across a supply voltage range of 2V to 6V with a maximum clock frequency of 175 MHz. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74AC273PC

onsemiIn Stock: 220574AC273PC Datasheet

Current PartRFQ

CD74AC273E

Texas InstrumentsIn Stock: 1053CD74AC273E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74AC273PC are identified based on the following critical parameters that determine functional compatibility:

Core Functional Parameters:

• Series designation (74AC)
• Type (D-Type Flip Flop)
• Number of elements (1)
• Number of bits per element (8)
• Output type (Non-Inverted)
• Trigger type (Positive Edge)
• Function (Master Reset)
• Package type (20-DIP)
• Mounting type (Through Hole)

Electrical Operating Parameters:

• Supply voltage range compatibility
• Clock frequency capability
• Propagation delay specifications
• Output current ratings
• Operating temperature range

The CD74AC273E from Texas Instruments qualifies as a substitute based on matching all core functional parameters and package specifications. Both parts operate within the 74AC logic family standard, feature identical pin configurations in 20-DIP packaging, and provide equivalent D-Type flip-flop functionality with 8-bit storage capacity.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC273E from Texas Instruments is a direct functional substitute for the 74AC273PC. Both components share identical logic family classification, pin configuration, and core operational characteristics within the 20-DIP package format.

The CD74AC273E offers the advantage of active product status, ensuring continued availability and manufacturing support. The substitute part demonstrates improved quiescent current performance (8 µA versus 40 µA) and an extended operating temperature range (-55°C to 125°C versus -40°C to 85°C), providing greater operational flexibility in temperature-sensitive applications.

The CD74AC273E is RoHS3 compliant, meeting current environmental and regulatory standards. Both parts maintain REACH unaffected status and identical ECCN and HTSUS classifications.

Design considerations should account for the CD74AC273E's slightly lower maximum clock frequency (114 MHz versus 175 MHz) and marginally increased propagation delay (12.3 ns versus 10 ns). These differences remain within acceptable tolerances for most standard logic applications operating at conventional clock frequencies.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC273E directly replace the 74AC273PC in existing designs?

A: Yes. Both parts are 20-DIP through-hole packages with identical pin configurations and functional specifications. Direct socket substitution is possible without circuit modifications.

Q: What are the key differences between these parts?

A: The primary differences are product status (CD74AC273E is active; 74AC273PC is obsolete), maximum clock frequency (114 MHz versus 175 MHz), propagation delay (12.3 ns versus 10 ns), quiescent current (8 µA versus 40 µA), and operating temperature range (-55°C to 125°C versus -40°C to 85°C).

Q: Are there packaging differences between the 74AC273PC and CD74AC273E?

A: Both parts use identical 20-DIP (0.300", 7.62mm) through-hole packaging. The CD74AC273E is supplied in tube packaging, while the 74AC273PC was supplied without specified packaging format.

Q: Does the CD74AC273E meet current compliance standards?

A: Yes. The CD74AC273E is RoHS3 compliant and maintains REACH unaffected status, meeting current environmental and regulatory requirements.

Q: What is the significance of the lower quiescent current in the CD74AC273E?

A: The CD74AC273E's quiescent current of 8 µA (compared to 40 µA in the 74AC273PC) indicates lower standby power consumption, which is beneficial for battery-powered or power-sensitive applications.

Q: Should the reduced maximum clock frequency of the CD74AC273E be a concern?

A: The 114 MHz maximum clock frequency of the CD74AC273E is suitable for standard logic applications. Substitution is appropriate unless the design specifically requires operation above 114 MHz.