74HCT74D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT74D,652 is a dual D-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc., housed in a 14-SOIC surface mount package. This device functions as a 2-element D-type flip-flop with complementary outputs, positive edge triggering, and set/reset capability. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HCT74D,652
Manufacturer	Nexperia USA Inc.
Series	74HCT
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Function	Set (Preset) and Reset
Clock Frequency	59 MHz
Max Propagation Delay @ V, Max CL	44ns @ 4.5V, 50pF
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	4mA, 4mA
Current - Quiescent (Iq)	40 µA
Input Capacitance	4.6 pF
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT74D,652 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Series: 74HCT (logic family compatibility)
Type: D-Type Flip-Flop
Number of Elements: 2
Number of Bits per Element: 1
Output Type: Complementary
Trigger Type: Positive Edge
Function: Set (Preset) and Reset
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply: 4.5V ~ 5.5V

Performance Parameters (allowable variation):

Clock Frequency: 59 MHz (minimum acceptable)
Max Propagation Delay: 44ns @ 4.5V, 50pF (maximum acceptable)
Current - Output High, Low: 4mA, 4mA (nominal)
Current - Quiescent (Iq): 40 µA (maximum acceptable)
Operating Temperature: -40°C ~ 125°C (TA) (minimum acceptable range)

Substitute parts are grouped into two categories: direct equivalents (identical electrical and mechanical specifications) and functional equivalents (same logic function with improved or comparable performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Clock Frequency	Max Propagation Delay @ V, Max CL	Current - Quiescent (Iq)	Operating Temperature	Product Status	RoHS Status
74HCT74D,652	Nexperia USA Inc.	59 MHz	44ns @ 4.5V, 50pF	40 µA	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
74HCT74D,653	NXP Semiconductors	59 MHz	44ns @ 4.5V, 50pF	40 µA	-40°C ~ 125°C	Active	Not specified
CD74HCT74M	Texas Instruments	50 MHz	35ns @ 4.5V, 50pF	4 µA	-55°C ~ 125°C	Discontinued at DiGi Electronics	ROHS3 Compliant
CD74HCT74M96	Harris Corporation	50 MHz	35ns @ 4.5V, 50pF	4 µA	-55°C ~ 125°C	Obsolete	RoHS non-compliant
CD74HCT74MT	Texas Instruments	50 MHz	35ns @ 4.5V, 50pF	4 µA	-55°C ~ 125°C	Discontinued at DiGi Electronics	ROHS3 Compliant
MC74HCT74ADG	onsemi	30 MHz	24ns @ 5V, 50pF	2 µA	-55°C ~ 125°C	Active	ROHS3 Compliant
MC74HCT74ADR2G	onsemi	30 MHz	24ns @ 5V, 50pF	2 µA	-55°C ~ 125°C	Active	ROHS3 Compliant
MM74HCT74M	Fairchild Semiconductor	27 MHz	35ns @ 5V, 50pF	2 µA	-40°C ~ 85°C	Active	Not specified
MM74HCT74MX	Fairchild Semiconductor	27 MHz	35ns @ 5V, 50pF	2 µA	-40°C ~ 85°C	Active	Not specified
SN74HCT74D	Texas Instruments	46 MHz	18ns @ 5.5V, 50pF	4 µA	-40°C ~ 85°C	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74HCT74DR	Texas Instruments	46 MHz	18ns @ 5.5V, 50pF	4 µA	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 74HCT74D,653

The 74HCT74D,653 from NXP Semiconductors is the direct equivalent to the 74HCT74D,652. It maintains identical electrical specifications (59 MHz clock frequency, 44ns propagation delay, 40 µA quiescent current) and identical package configuration (14-SOIC). The part is currently in active production status, ensuring long-term availability. This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendation: SN74HCT74DR

The SN74HCT74DR from Texas Instruments is an active production part with superior performance characteristics. It offers faster propagation delay (18ns @ 5.5V versus 44ns @ 4.5V) and lower quiescent current (4 µA versus 40 µA), making it suitable for applications requiring improved speed performance. ROHS3 compliance and MSL 1 rating ensure environmental and handling compatibility. This part is recommended for new designs or performance-critical applications.

Tertiary Recommendation: MC74HCT74ADR2G

The MC74HCT74ADR2G from onsemi is an active production part offering the fastest propagation delay (24ns @ 5V) and lowest quiescent current (2 µA) among available substitutes. Extended operating temperature range (-55°C ~ 125°C) provides broader environmental coverage. ROHS3 compliance and MSL 1 rating are confirmed. This part is recommended for applications requiring optimized power consumption and thermal performance.

Not Recommended: CD74HCT74M96

The CD74HCT74M96 from Harris Corporation is RoHS non-compliant and obsolete, making it unsuitable for new designs or long-term production support.

Conditional Recommendation: MM74HCT74M and MM74HCT74MX

These Fairchild Semiconductor parts are active but have reduced operating temperature range (-40°C ~ 85°C versus -40°C ~ 125°C). They are suitable only for applications with temperature requirements within this narrower range.

Frequently Asked Questions (FAQ)

Q: Can I use 74HCT74D,653 as a direct replacement for 74HCT74D,652?

A: Yes. The 74HCT74D,653 is electrically and mechanically identical to the 74HCT74D,652. Both parts share the same 74HCT series logic family, dual D-type flip-flop configuration, complementary output type, positive edge triggering, and 14-SOIC package. The 74HCT74D,653 is currently in active production, making it the preferred direct replacement.

Q: What is the difference between the main part and SN74HCT74DR?

A: The SN74HCT74DR offers improved performance with faster propagation delay (18ns @ 5.5V compared to 44ns @ 4.5V) and lower quiescent current (4 µA compared to 40 µA). Both parts maintain the same 14-SOIC package, supply voltage range (4.5V ~ 5.5V), and output current specifications (4mA). The SN74HCT74DR is suitable for applications where faster switching speed is beneficial.

Q: Are all substitute parts available in the same 14-SOIC package?

A: Yes. All substitute parts listed are housed in the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and sockets.

Q: Which substitute part has the lowest power consumption?

A: The MC74HCT74ADR2G has the lowest quiescent current at 2 µA, compared to 40 µA for the original 74HCT74D,652. This part is recommended for battery-powered or low-power applications.

Q: What is the operating temperature range of the substitute parts?

A: Most substitute parts support -40°C ~ 125°C (TA), matching or exceeding the original part's range. The MC74HCT74ADR2G and CD74HCT74M series extend this to -55°C ~ 125°C. The MM74HCT74M and MM74HCT74MX are limited to -40°C ~ 85°C.

Q: Are all substitute parts RoHS compliant?

A: Most active production parts are ROHS3 compliant. The CD74HCT74M96 is RoHS non-compliant and should not be used in new designs. The MM74HCT74M and MM74HCT74MX do not specify RoHS status.

Q: Can I use parts with different clock frequencies?

A: Yes, provided the substitute part's clock frequency meets or exceeds the original specification (59 MHz). Parts with lower clock frequencies (50 MHz, 46 MHz, 30 MHz, 27 MHz) are acceptable if your application does not require the full 59 MHz performance. Verify that your circuit's timing requirements are satisfied by the substitute part's specifications.

Q: What packaging options are available for substitute parts?

A: All substitute parts are available in surface mount configuration. Packaging formats vary: Tube, Tape & Reel (TR), Cut Tape (CT), and Bulk. Select the packaging format that matches your procurement and assembly requirements.

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