CD74HC73E-NG Equivalent & Substitute Parts

Part Overview

The CD74HC73E-NG is a dual JK-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 14-DIP through-hole package. This device functions as a reset-capable, negative-edge-triggered flip-flop with complementary outputs, operating across a 2V to 6V supply voltage range with a maximum clock frequency of 60 MHz.

The CD74HC73E-NG is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production and repair requirements for systems utilizing this logic function.

Key Parameters

Parameter	Value
Part Number	CD74HC73E-NG
Manufacturer	Texas Instruments
Series	74HC
Type	JK Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Negative Edge
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	28 ns
Voltage Supply Range	2V to 6V
Current Output High/Low	5.2 mA / 5.2 mA
Quiescent Current (Iq)	4 µA
Input Capacitance	10 pF
Operating Temperature	-55°C to 125°C
Package Type	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CD74HC73E-NG are identified based on strict electrical and mechanical parameter matching within the 74HC logic family. Substitution validity is determined by the following criteria:

Core Functional Parameters (Must Match):

JK-type flip-flop architecture with 2 elements, 1 bit per element
Complementary output configuration
Negative-edge trigger mechanism
Reset function capability
60 MHz clock frequency specification
28-29 ns maximum propagation delay @ 6V, 50pF load
2V to 6V supply voltage range
5.2 mA output current (high and low)
4 µA quiescent current
10 pF input capacitance
-55°C to 125°C operating temperature range

Mechanical Compatibility Parameters:

Package type (14-DIP or 14-SOIC)
Pin count and pinout configuration
Physical dimensions and mounting method

Substitutes are grouped into two categories: Manufacturer Recommended (preferred for new designs and production) and Parametric Equivalent (functionally compatible alternatives).

Parameter Comparison

Parameter	CD74HC73E-NG (Main)	CD74HC73M96 (MFR Recommended)	CD74HC107E (Parametric Equiv.)	CD74HC107EX (Parametric Equiv.)	CD74HC73E (Parametric Equiv.)
Manufacturer	Texas Instruments	Texas Instruments	Harris Corporation	Harris Corporation	Texas Instruments
Type	JK Type	JK Type	JK Type	JK Type	JK Type
Number of Elements	2	2	2	2	2
Output Type	Complementary	Complementary	Complementary	Complementary	Complementary
Trigger Type	Negative Edge	Negative Edge	Negative Edge	Negative Edge	Negative Edge
Clock Frequency	60 MHz	60 MHz	60 MHz	60 MHz	60 MHz
Max Propagation Delay @ 6V, 50pF	28 ns	28 ns	29 ns	29 ns	28 ns
Voltage Supply Range	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 6V
Current Output High/Low	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA
Quiescent Current (Iq)	4 µA	4 µA	4 µA	4 µA	4 µA
Input Capacitance	10 pF	10 pF	10 pF	10 pF	10 pF
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Package Type	14-DIP (0.300", 7.62mm)	14-SOIC (0.154", 3.90mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	RoHS Non-Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Through-Hole PCB Designs (Direct Pin-Compatible Replacement):

The CD74HC73E (Texas Instruments, Tube packaging) is the primary parametric equivalent for through-hole applications. This part maintains identical electrical specifications, package dimensions, and mounting method as the CD74HC73E-NG. The CD74HC73E carries Active product status and ROHS3 compliance, providing long-term availability and regulatory alignment.

The CD74HC107EX (Harris Corporation) is an alternative through-hole substitute with Active product status. This part exhibits a 1 ns increase in maximum propagation delay (29 ns versus 28 ns) and carries RoHS non-compliance status. Selection of this part requires evaluation against design timing margins and regulatory requirements.

The CD74HC107E (Harris Corporation) is functionally equivalent but classified as Obsolete, limiting its suitability for new production applications despite current inventory availability.

For Surface-Mount PCB Designs (Package Conversion):

The CD74HC73M96 (Texas Instruments) is the manufacturer-recommended substitute for surface-mount implementations. This part provides identical electrical performance to the CD74HC73E-NG while utilizing a 14-SOIC package format. The CD74HC73M96 is Active, ROHS3 compliant, and available in Tape & Reel packaging suitable for automated assembly. PCB layout and footprint redesign is required for this substitution.

Compliance and Availability Considerations:

For applications requiring ROHS3 compliance, select CD74HC73E or CD74HC73M96 (both Texas Instruments). For applications where RoHS compliance is not mandated, CD74HC107E and CD74HC107EX remain functionally valid alternatives, though CD74HC107E is obsolete.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC73M96 directly replace the CD74HC73E-NG on an existing PCB?

A: No. The CD74HC73M96 uses a 14-SOIC surface-mount package, while the CD74HC73E-NG uses a 14-DIP through-hole package. PCB redesign and component footprint modification are required. However, electrical functionality and pin assignments are identical, enabling functional substitution with layout changes.

Q: What is the difference between CD74HC73E and CD74HC107E?

A: Both are JK-type dual flip-flops with identical electrical specifications. The CD74HC73 and CD74HC107 are different base product numbers within the 74HC family, but they perform the same logic function. The CD74HC107E is manufactured by Harris Corporation, while the CD74HC73E is manufactured by Texas Instruments. Both are parametric equivalents suitable for substitution.

Q: Why is the CD74HC73E-NG classified as obsolete?

A: The CD74HC73E-NG is obsolete due to market transition toward surface-mount packaging and active product line consolidation. The CD74HC73M96 (surface-mount) and CD74HC73E (through-hole, active status) represent the current product offerings from Texas Instruments for this logic function.

Q: Are there timing differences between the main part and substitutes?

A: The CD74HC73E-NG and CD74HC73E/CD74HC73M96 specify 28 ns maximum propagation delay. The CD74HC107E and CD74HC107EX specify 29 ns maximum propagation delay. This 1 ns difference is within typical design margins for 60 MHz logic circuits but should be verified against specific timing requirements.

Q: Which substitute is recommended for new product designs?

A: For through-hole designs, use CD74HC73E (Texas Instruments, Active, ROHS3 compliant). For surface-mount designs, use CD74HC73M96 (Texas Instruments, Active, ROHS3 compliant, Tape & Reel packaging). Both are current products with long-term availability.

Q: What is the MSL (Moisture Sensitivity Level) for these parts?

A: The CD74HC73E-NG and CD74HC73E specify MSL as Not Applicable (through-hole packages). The CD74HC73M96 specifies MSL 1 (Unlimited), indicating minimal moisture sensitivity for surface-mount applications.

Q: Can I use CD74HC107EX as a substitute in a production environment?

A: The CD74HC107EX is functionally compatible and carries Active product status. However, it is RoHS non-compliant and carries MSL 3 (168 Hours), requiring controlled moisture handling. Use is acceptable only if RoHS compliance is not required and moisture control procedures are implemented.

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