CD74HCT74M Equivalent & Substitute Parts

Part Overview

The CD74HCT74M is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in 14-SOIC surface mount packaging. This device functions as a 2-element D-type flip-flop with complementary outputs, set/preset and reset capabilities, and positive edge triggering. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers that maintain electrical and mechanical compatibility within the 74HCT logic family.

Key Parameters

Parameter	Value
Logic Family	74HCT
Function	Dual D-Type Flip-Flop with Set/Preset and Reset
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Clock Frequency	50 MHz
Max Propagation Delay @ 4.5V, 50pF	35 ns
Voltage Supply Range	4.5V – 5.5V
Current Output (High/Low)	4 mA / 4 mA
Quiescent Current (Iq)	4 µA
Input Capacitance	10 pF
Operating Temperature Range	−55°C to +125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HCT74M is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic family classification (74HCT or compatible variants)
Dual D-type flip-flop configuration with 2 elements, 1 bit per element
Complementary output type with set/preset and reset functions
Positive edge trigger mechanism
14-SOIC surface mount package (0.154", 3.90mm width)
Supply voltage range: 4.5V – 5.5V
Operating temperature range: minimum −55°C or higher, maximum +125°C or higher

Acceptable Performance Variations: Substitute parts may exhibit different clock frequency ratings, propagation delay specifications, quiescent current consumption, and output drive current, provided the part remains functionally compatible within the 74HCT logic family or approved variants (74VHCT). Parts meeting all critical parameters are classified as direct substitutes regardless of product status or manufacturer.

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency (MHz)	Max Prop. Delay @ 4.5V, 50pF (ns)	Iq (µA)	Output Current (mA)	Temp. Range (°C)	Product Status	RoHS
CD74HCT74M	Texas Instruments	74HCT	50	35	4	4/4	−55 to +125	Discontinued	ROHS3
MC74HCT74ADR2G	onsemi	74HCT	30	24 @ 5V	2	4/4	−55 to +125	Active	ROHS3
MC74HCT74ADG	onsemi	74HCT	30	24 @ 5V	2	4/4	−55 to +125	Active	ROHS3
MC74VHCT74ADR2G	onsemi	74VHCT	140	8.8 @ 5V	2	8/8	−55 to +125	Active	ROHS3
74HCT74D,653	NXP Semiconductors	74HCT	59	44 @ 4.5V	40	4/4	−40 to +125	Active	Not specified
74HCT74D-Q100,118	Nexperia USA Inc.	74HCT	59	44 @ 4.5V	40	4/4	−40 to +125	Active	ROHS3
CD74HCT74M96	Harris Corporation	74HCT	50	35 @ 4.5V	4	4/4	−55 to +125	Obsolete	Non-compliant
MM74HCT74M	Fairchild Semiconductor	74HCT	27	35 @ 5V	2	4.8/4.8	−40 to +85	Active	Not specified
MM74HCT74MX	Fairchild Semiconductor	74HCT	27	35 @ 5V	2	4.8/4.8	−40 to +85	Active	Not specified
NLV74HCT74ADR2G	onsemi	74HCT	30	24 @ 5V	2	4/4	−55 to +125	Obsolete	ROHS3

Engineering Selection Recommendations

Tier 1 – Recommended Active Substitutes (Full Compatibility):

MC74HCT74ADR2G and MC74HCT74ADG (onsemi) maintain identical 74HCT logic family classification, dual D-type flip-flop configuration, and 14-SOIC packaging. Both are active products with ROHS3 compliance and −55°C to +125°C operating range matching the original specification. Propagation delay of 24 ns at 5V and quiescent current of 2 µA represent improved performance characteristics. Tape & Reel (TR) packaging of MC74HCT74ADR2G supports automated assembly; Tube packaging of MC74HCT74ADG accommodates manual handling.

74HCT74D-Q100,118 (Nexperia USA Inc.) is an active product with ROHS3 compliance, AEC-Q100 automotive qualification, and Tape & Reel packaging. Operating temperature range of −40°C to +125°C covers the original −55°C to +125°C specification for applications not requiring extended low-temperature operation. Quiescent current of 40 µA represents higher consumption than the original part.

Tier 2 – Alternative Active Substitutes (Conditional Use):

MC74VHCT74ADR2G (onsemi) belongs to the 74VHCT logic family variant, offering superior performance with 140 MHz clock frequency and 8.8 ns propagation delay. Output drive current of 8 mA per line exceeds the original 4 mA specification. This part is suitable for applications requiring higher speed operation within the same 4.5V – 5.5V supply range and −55°C to +125°C temperature envelope.

74HCT74D,653 (NXP Semiconductors) is an active product with 59 MHz clock frequency and 44 ns propagation delay. Quiescent current of 40 µA is significantly higher than the original 4 µA specification. Operating temperature range of −40°C to +125°C does not extend to −55°C. This part is suitable for applications with relaxed low-temperature requirements and higher quiescent current tolerance.

MM74HCT74M and MM74HCT74MX (Fairchild Semiconductor) are active products with 27 MHz clock frequency and 35 ns propagation delay. Operating temperature range of −40°C to +85°C does not meet the original −55°C to +125°C specification. These parts are suitable only for applications with restricted temperature requirements (−40°C minimum, +85°C maximum).

Obsolete Parts (Not Recommended for New Designs):

CD74HCT74M96 (Harris Corporation) is classified as obsolete with RoHS non-compliance. NLV74HCT74ADR2G (onsemi) is classified as obsolete. These parts should not be selected for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can MC74HCT74ADR2G replace CD74HCT74M in existing designs?

A: Yes. Both parts are 74HCT logic family dual D-type flip-flops in 14-SOIC packaging with identical functional configuration, supply voltage range (4.5V – 5.5V), and operating temperature range (−55°C to +125°C). MC74HCT74ADR2G is an active product with improved propagation delay (24 ns at 5V versus 35 ns at 4.5V) and lower quiescent current (2 µA versus 4 µA). No design modifications are required.

Q: What is the difference between MC74HCT74ADR2G and MC74HCT74ADG?

A: Both parts are electrically identical onsemi 74HCT dual D-type flip-flops with identical electrical specifications. The difference is packaging format: MC74HCT74ADR2G is supplied in Tape & Reel (TR) format for automated pick-and-place assembly; MC74HCT74ADG is supplied in Tube format for manual handling and lower-volume applications.

Q: Why is MC74VHCT74ADR2G listed as a substitute if it is a different logic family?

A: MC74VHCT74ADR2G is a 74VHCT variant that maintains functional compatibility with 74HCT devices. It performs the same dual D-type flip-flop function in the same 14-SOIC package with identical supply voltage range (4.5V – 5.5V) and operating temperature range (−55°C to +125°C). The 74VHCT designation indicates higher speed performance (140 MHz clock frequency, 8.8 ns propagation delay) and higher output drive current (8 mA). It is suitable for applications requiring improved speed performance within the same electrical environment.

Q: Can I use 74HCT74D,653 (NXP) or 74HCT74D-Q100,118 (Nexperia) as substitutes?

A: Yes, both are active 74HCT dual D-type flip-flops in 14-SOIC packaging with identical functional configuration and supply voltage range. However, the operating temperature range is −40°C to +125°C, which does not extend to −55°C. These parts are suitable only for applications that do not require operation below −40°C. Quiescent current is 40 µA, significantly higher than the original 4 µA specification. 74HCT74D-Q100,118 includes AEC-Q100 automotive qualification and ROHS3 compliance.

Q: Why are MM74HCT74M and MM74HCT74MX not recommended?

A: Both Fairchild Semiconductor parts have an operating temperature range of −40°C to +85°C, which does not meet the original −55°C to +125°C specification. These parts are suitable only for applications with restricted temperature requirements (−40°C minimum, +85°C maximum). For applications requiring the full −55°C to +125°C range, onsemi or NXP alternatives are required.

Q: Is RoHS compliance a critical factor in selecting a substitute?

A: RoHS compliance status is provided for reference. ROHS3-compliant parts (MC74HCT74ADR2G, MC74HCT74ADG, 74HCT74D-Q100,118, NLV74HCT74ADR2G, MC74VHCT74ADR2G) meet current environmental regulations. Parts with unspecified or non-compliant status may be restricted in certain applications or regions. For new designs, ROHS3-compliant alternatives are recommended.

Q: What is the significance of Moisture Sensitivity Level (MSL)?

A: MSL 1 (Unlimited) indicates the part has unlimited shelf life and requires no special moisture control during storage or handling. All recommended substitute parts with specified MSL are rated MSL 1, ensuring compatibility with standard component storage and assembly processes.

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