CD74HCT74MT Equivalent & Substitute Parts

Part Overview

The CD74HCT74MT 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 Set/Preset and Reset flip-flop with complementary outputs, operating at a maximum clock frequency of 50 MHz with 35ns propagation delay at 4.5V. The part is discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain functional and electrical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Device Type	D-Type Flip-Flop, Dual Element
Package	14-SOIC (0.154", 3.90mm Width)
Clock Frequency	50 MHz
Propagation Delay	35ns @ 4.5V, 50pF
Supply Voltage	4.5V – 5.5V
Output Current	4mA High / 4mA Low
Quiescent Current	4 µA
Operating Temperature	-55°C to 125°C
Trigger Type	Positive Edge
Output Type	Complementary
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HCT74MT is determined by the following critical parameters: package type (14-SOIC), device function (dual D-type flip-flop with Set/Reset), output type (complementary), trigger mechanism (positive edge), and supply voltage range (4.5V–5.5V). Parts meeting these core requirements are considered functionally equivalent. Secondary parameters including clock frequency, propagation delay, quiescent current, and operating temperature range may vary within acceptable engineering tolerances. Parts with identical or superior electrical performance characteristics are direct substitutes. Parts with lower performance specifications require application-level verification but remain mechanically and functionally compatible.

Parameter Comparison

Part Number	Manufacturer	Status	Clock Freq (MHz)	Prop Delay (ns)	Iq (µA)	Temp Range (°C)	RoHS	Package
CD74HCT74MT	Texas Instruments	Discontinued	50	35 @ 4.5V	4	-55 to 125	ROHS3	14-SOIC
CD74HCT74M96	Harris Corporation	Obsolete	50	35 @ 4.5V	4	-55 to 125	Non-compliant	14-SOIC
MC74HCT74ADR2G	onsemi	Active	30	24 @ 5V	2	-55 to 125	ROHS3	14-SOIC
74HCT74D,653	NXP Semiconductors	Active	59	44 @ 4.5V	40	-40 to 125	Not specified	14-SOIC
74HCT74D-Q100,118	Nexperia USA Inc.	Active	59	44 @ 4.5V	40	-40 to 125	ROHS3	14-SOIC
MC74HCT74ADG	onsemi	Active	30	24 @ 5V	2	-55 to 125	ROHS3	14-SOIC
MC74VHCT74ADR2G	onsemi	Active	140	8.8 @ 5V	2	-55 to 125	ROHS3	14-SOIC
MM74HCT74M	Fairchild Semiconductor	Active	27	35 @ 5V	2	-40 to 85	Not specified	14-SOIC
MM74HCT74MX	Fairchild Semiconductor	Active	27	35 @ 5V	2	-40 to 85	Not specified	14-SOIC
NLV74HCT74ADR2G	onsemi	Obsolete	30	24 @ 5V	2	-55 to 125	ROHS3	14-SOIC

Engineering Selection Recommendations

Primary Recommendation: MC74HCT74ADR2G (onsemi) Active product status with ROHS3 compliance and full temperature range (-55°C to 125°C) matching the original specification. Propagation delay of 24ns at 5V exceeds original performance. Available in Tape & Reel packaging for production environments.

Secondary Recommendation: 74HCT74D-Q100,118 (Nexperia USA Inc.) Active automotive-grade part with AEC-Q100 qualification and ROHS3 compliance. Suitable for applications requiring automotive reliability standards. Operating temperature range limited to -40°C to 125°C.

Alternative for High-Speed Applications: MC74VHCT74ADR2G (onsemi) Active product with superior clock frequency (140 MHz) and propagation delay (8.8ns). Operates within identical supply voltage and temperature ranges. Recommended where increased speed margin is required.

Legacy Compatibility: MM74HCT74M or MM74HCT74MX (Fairchild Semiconductor) Active products with matching propagation delay specification (35ns). Operating temperature range limited to -40°C to 85°C. Suitable for applications not requiring extended low-temperature operation.

Avoid: CD74HCT74M96 (Harris Corporation) Obsolete status and RoHS non-compliance eliminate this option for new designs and regulated applications.

Avoid: NLV74HCT74ADR2G (onsemi) Obsolete product status despite ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can MC74HCT74ADR2G directly replace CD74HCT74MT? A: Yes. Both devices are dual D-type flip-flops in 14-SOIC packaging with identical functional specifications, supply voltage range (4.5V–5.5V), and operating temperature range (-55°C to 125°C). The MC74HCT74ADR2G is active and ROHS3 compliant, making it the preferred direct replacement.

Q: What is the difference between 74HCT74 and 74VHCT74 series? A: The 74VHCT74 series (represented by MC74VHCT74ADR2G) operates at higher clock frequencies (140 MHz vs. 50 MHz) with faster propagation delay (8.8ns vs. 35ns). Both maintain identical supply voltage and temperature specifications. The 74VHCT74 is suitable for applications requiring higher speed performance.

Q: Are there packaging differences between substitute parts? A: All listed substitutes use 14-SOIC (0.154", 3.90mm Width) surface mount packaging. Packaging variants differ only in shipping format: Cut Tape (CT), Tape & Reel (TR), Tube, or Bulk. These do not affect electrical or mechanical compatibility on the PCB.

Q: Why do some parts show higher quiescent current (40 µA vs. 4 µA)? A: The NXP 74HCT74D,653 and Nexperia 74HCT74D-Q100,118 exhibit higher quiescent current specifications. This represents a trade-off in power consumption but does not affect functional compatibility. Applications sensitive to standby power consumption should prioritize onsemi or Fairchild alternatives.

Q: Is the Nexperia 74HCT74D-Q100,118 suitable for automotive applications? A: Yes. This part carries AEC-Q100 automotive qualification and is suitable for automotive-grade designs. Operating temperature range is -40°C to 125°C, which covers standard automotive specifications.

Q: Can I use MM74HCT74M in applications requiring -55°C operation? A: No. The Fairchild MM74HCT74M and MM74HCT74MX are rated only to -40°C minimum. Applications requiring -55°C operation must use MC74HCT74ADR2G, MC74HCT74ADG, MC74VHCT74ADR2G, or NLV74HCT74ADR2G.

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