CD74ACT273EE4 Equivalent & Substitute Parts

Part Overview

The CD74ACT273EE4 is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, designed for 8-bit parallel data storage and synchronization applications. This device features a master reset function, positive edge triggering, and operates across the industrial temperature range of -55°C to 125°C. The part is currently in active production status with 621 units available in stock.

Substitute parts become necessary when the primary source experiences supply constraints, when design requirements mandate alternative compliance certifications, or when legacy designs require transition to functionally equivalent alternatives from different manufacturers.

Key Parameters

Parameter	Value	Unit
Function	Master Reset	—
Type	D-Type Flip-Flop	—
Number of Elements	1	—
Number of Bits per Element	8	—
Clock Frequency	85	MHz
Max Propagation Delay @ 5V, 50pF	13.5	ns
Trigger Type	Positive Edge	—
Output Type	Non-Inverted	—
Current - Output High	24	mA
Current - Output Low	24	mA
Voltage - Supply	4.5 to 5.5	V
Current - Quiescent	8	µA
Input Capacitance	10	pF
Operating Temperature	-55 to 125	°C
Package / Case	20-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD74ACT273EE4 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

D-Type flip-flop architecture with 8-bit configuration
Master reset function capability
Positive edge trigger mechanism
Non-inverted output type
Clock frequency of 85 MHz minimum
Maximum propagation delay of 13.5 ns at 5V with 50 pF load
Output drive capability of 24 mA (high and low)
Supply voltage range of 4.5V to 5.5V
Quiescent current of 8 µA
Input capacitance of 10 pF

Mechanical Equivalence Requirements:

20-DIP package with 0.300" (7.62mm) pitch
Through-hole mounting configuration

Series Compatibility:

74ACT logic family designation

Parts meeting all electrical and mechanical parameters are classified as parametric equivalents and may be substituted without circuit redesign.

Parameter Comparison

Parameter	CD74ACT273EE4 (Texas Instruments)	CD74ACT273E (Harris Corporation)	Match Status
Manufacturer Part Number	CD74ACT273EE4	CD74ACT273E	Different suffix
Series	74ACT	74ACT	Equivalent
Function	Master Reset	Master Reset	Equivalent
Type	D-Type	D-Type	Equivalent
Number of Elements	1	1	Equivalent
Number of Bits per Element	8	8	Equivalent
Clock Frequency	85 MHz	85 MHz	Equivalent
Max Propagation Delay @ 5V, 50pF	13.5 ns	13.5 ns	Equivalent
Trigger Type	Positive Edge	Positive Edge	Equivalent
Output Type	Non-Inverted	Non-Inverted	Equivalent
Current - Output High, Low	24 mA, 24 mA	24 mA, 24 mA	Equivalent
Voltage - Supply	4.5 to 5.5 V	4.5 to 5.5 V	Equivalent
Current - Quiescent	8 µA	8 µA	Equivalent
Input Capacitance	10 pF	10 pF	Equivalent
Operating Temperature	-55 to 125°C	-55 to 125°C	Equivalent
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Product Status	Active	Obsolete	Different
RoHS Status	ROHS3 Compliant	RoHS non-compliant	Different

Engineering Selection Recommendations

CD74ACT273EE4 (Texas Instruments) - Primary Selection

The CD74ACT273EE4 is the recommended primary choice for new designs and ongoing production. This device carries active product status, ensuring long-term availability and supply chain stability. The part is ROHS3 compliant, meeting current environmental and regulatory requirements for commercial and industrial applications. The through-hole 20-DIP package provides robust mechanical reliability for applications requiring high vibration resistance or thermal cycling tolerance.

CD74ACT273E (Harris Corporation) - Substitute Selection

The CD74ACT273E is a parametric equivalent suitable for direct substitution in existing designs where the CD74ACT273EE4 is unavailable. All electrical and mechanical parameters are identical, ensuring functional compatibility without circuit modification. However, this part carries obsolete product status and is non-compliant with ROHS3 standards. Selection of this substitute should be limited to legacy system maintenance, repair applications, or situations where regulatory compliance is not a design requirement. The 1152 units in stock provide temporary supply availability.

Compliance Considerations

Applications subject to ROHS3 compliance mandates must use the CD74ACT273EE4. Applications without regulatory compliance requirements may use either part based on availability and cost considerations.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT273E be used as a direct replacement for the CD74ACT273EE4?

A: Yes. The CD74ACT273E is a parametric equivalent with identical electrical specifications and mechanical packaging. Direct substitution is possible without circuit redesign. However, the CD74ACT273E is obsolete and non-ROHS3 compliant, making it unsuitable for applications with regulatory requirements.

Q: What is the difference between the CD74ACT273EE4 and CD74ACT273E part numbers?

A: Both parts are 8-bit D-Type flip-flops in the 74ACT logic family with identical functional specifications. The primary differences are manufacturer (Texas Instruments vs. Harris Corporation), product status (active vs. obsolete), and compliance certification (ROHS3 compliant vs. non-compliant). The suffix "EE4" in the Texas Instruments part number indicates packaging and lead configuration specifications.

Q: Are there any timing differences between these parts?

A: No. Both parts specify identical maximum propagation delay of 13.5 ns at 5V with 50 pF load, clock frequency of 85 MHz, and all other timing parameters. Timing-critical applications may use either part interchangeably.

Q: What is the 20-DIP package specification?

A: The 20-DIP (Dual Inline Package) is a through-hole component package with 20 pins arranged in two parallel rows, spaced 0.300 inches (7.62 mm) apart. This package is suitable for breadboard prototyping, PCB through-hole assembly, and applications requiring mechanical robustness.

Q: Can these parts be used in surface-mount applications?

A: No. Both the CD74ACT273EE4 and CD74ACT273E are through-hole mounted components in 20-DIP packages. Surface-mount alternatives would require different package types (such as SOIC or TSSOP) and different part numbers.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. ROHS3 compliance is mandatory for products sold in the European Union and is increasingly required by OEMs and end-users globally. The CD74ACT273EE4 meets this requirement; the CD74ACT273E does not.

Q: Are these parts suitable for military or aerospace applications?

A: The provided specifications do not include military-grade certifications (such as MIL-PRF or MIL-STD designations). For military or aerospace applications, consult the manufacturer's military-grade product line or request formal qualification documentation.

Q: What is the operating temperature range?

A: Both parts operate across -55°C to 125°C, covering industrial and extended commercial temperature ranges. This range is suitable for automotive, industrial control, and outdoor applications.

Q: How do I verify compatibility before substitution?

A: Verify that your circuit design uses only the electrical and mechanical parameters listed in the Key Parameters table. Confirm that your application does not require specific manufacturer certifications beyond those provided. Perform a pin-by-pin functional review to ensure all signal connections match the 20-DIP pinout.

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