CD74HCT74ME4 Equivalent & Substitute Parts

Part Overview

The CD74HCT74ME4 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, positive edge triggering, and set/reset control. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across supply voltage, propagation delay, output current, and thermal operating range specifications.

Key Parameters

Parameter	Value	Unit
Type	D-Type Flip-Flop, Dual Element	—
Number of Elements	2	—
Number of Bits per Element	1	—
Output Type	Complementary	—
Trigger Type	Positive Edge	—
Function	Set (Preset) and Reset	—
Clock Frequency	50	MHz
Max Propagation Delay @ 4.5V, 50pF	35	ns
Voltage Supply Range	4.5 to 5.5	V
Current Output High/Low	4 / 4	mA
Current Quiescent (Iq)	4	µA
Input Capacitance	10	pF
Operating Temperature Range	−55 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

Substitute parts for the CD74HCT74ME4 are classified based on strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

Dual D-type flip-flop architecture with 2 elements, 1 bit per element
Complementary output configuration
Positive edge trigger mechanism
Set/Reset function capability
14-SOIC surface mount package (0.154", 3.90mm width)
Supply voltage range: 4.5V to 5.5V
Operating temperature range compatibility
Output current capability: minimum 4mA high and low

Secondary Compatibility Parameters:

Clock frequency: 50 MHz or higher acceptable
Propagation delay: 35ns or lower at specified conditions
Quiescent current: 4µA or lower preferred
Input capacitance: 10pF or lower
RoHS3 compliance and MSL rating

Parts are grouped into three categories: direct equivalents (identical specifications), compatible alternatives (meet all critical parameters with minor variations), and performance-enhanced variants (higher speed or lower power consumption while maintaining backward compatibility).

Parameter Comparison

Part Number	Manufacturer	Clock Freq (MHz)	Prop Delay @ 4.5V (ns)	Iq (µA)	Output Current (mA)	Temp Range (°C)	Status	RoHS3
CD74HCT74ME4	Texas Instruments	50	35	4	4 / 4	−55 to +125	Obsolete	Yes
CD74HCT74M96	Harris Corporation	50	35	4	4 / 4	−55 to +125	Obsolete	No
MC74HCT74ADR2G	onsemi	30	24	2	4 / 4	−55 to +125	Active	Yes
MM74HCT74M	Fairchild Semiconductor	27	35	2	4.8 / 4.8	−40 to +85	Active	—
CD74HCT74M	Texas Instruments	50	35	4	4 / 4	−55 to +125	Discontinued	Yes
74HCT74D,653	NXP Semiconductors	59	44	40	4 / 4	−40 to +125	Active	—
74HCT74D-Q100,118	Nexperia USA Inc.	59	44	40	4 / 4	−40 to +125	Active	Yes
MC74HCT74ADG	onsemi	30	24	2	4 / 4	−55 to +125	Active	Yes
MC74VHCT74ADR2G	onsemi	140	8.8	2	8 / 8	−55 to +125	Active	Yes
MM74HCT74MX	Fairchild Semiconductor	27	35	2	4.8 / 4.8	−40 to +85	Active	—
NLV74HCT74ADR2G	onsemi	30	24	2	4 / 4	−55 to +125	Obsolete	Yes

Engineering Selection Recommendations

Tier 1: Direct Equivalents (Recommended Primary Substitutes)

MC74HCT74ADG and MC74HCT74ADR2G (onsemi) are the preferred direct substitutes. Both maintain identical functional architecture, 14-SOIC packaging, and full temperature range operation (−55°C to +125°C). These parts are currently in active production status with ROHS3 compliance. The MC74HCT74ADR2G variant offers tape & reel packaging suitable for automated assembly, while MC74HCT74ADG is supplied in tube packaging. Both deliver superior propagation delay performance (24ns vs. 35ns) and reduced quiescent current (2µA vs. 4µA), providing enhanced efficiency without compromising backward compatibility.

Tier 2: Compatible Alternatives (Secondary Substitutes)

CD74HCT74M (Texas Instruments) provides identical electrical specifications to the original CD74HCT74ME4 with ROHS3 compliance and full temperature range support. However, this part is discontinued at DiGi Electronics, limiting long-term procurement viability. MM74HCT74M and MM74HCT74MX (Fairchild Semiconductor) are active production alternatives with equivalent propagation delay and enhanced output current (4.8mA). These parts operate within the reduced temperature range (−40°C to +85°C), which may restrict use in extended temperature applications.

Tier 3: Performance-Enhanced Variants (High-Speed Applications)

MC74VHCT74ADR2G (onsemi) represents a performance-enhanced variant based on the 74VHCT series architecture. This part delivers significantly faster propagation delay (8.8ns vs. 35ns) and higher output current (8mA vs. 4mA) while maintaining ROHS3 compliance and full temperature range operation. The 74VHCT74D-Q100,118 (Nexperia USA Inc.) offers automotive-grade qualification (AEC-Q100) with active production status, suitable for automotive and mission-critical applications requiring enhanced reliability documentation.

Tier 4: Not Recommended

74HCT74D,653 (NXP Semiconductors) exhibits elevated quiescent current (40µA vs. 4µA) and increased propagation delay (44ns vs. 35ns), making it unsuitable as a direct substitute despite active production status. CD74HCT74M96 (Harris Corporation) lacks RoHS3 compliance, limiting applicability in regulated environments. NLV74HCT74ADR2G (onsemi) is obsolete, offering no procurement advantage over the original part.

Frequently Asked Questions (FAQ)

Q1: Can MC74HCT74ADR2G directly replace CD74HCT74ME4 in existing designs?

Yes. MC74HCT74ADR2G maintains identical functional specifications, 14-SOIC packaging, and supply voltage range. The part is pin-compatible and electrically interchangeable. Superior propagation delay (24ns vs. 35ns) and lower quiescent current (2µA vs. 4µA) provide performance benefits without requiring design modification.

Q2: What is the primary difference between MC74HCT74ADG and MC74HCT74ADR2G?

Both parts are electrically identical. The difference is packaging format: MC74HCT74ADG is supplied in tube packaging for manual handling and small-volume assembly, while MC74HCT74ADR2G is supplied in tape & reel format optimized for automated pick-and-place assembly. Select based on manufacturing process requirements.

Q3: Why is MC74VHCT74ADR2G listed as a substitute if it has different specifications?

MC74VHCT74ADR2G is a performance-enhanced variant suitable for applications requiring higher clock frequency (140MHz vs. 50MHz) or faster propagation delay (8.8ns vs. 35ns). It maintains backward compatibility through identical pin configuration, 14-SOIC packaging, and supply voltage range. Use this part only when higher speed performance is required or beneficial.

Q4: Are there temperature range restrictions when substituting with Fairchild parts?

Yes. MM74HCT74M and MM74HCT74MX operate within −40°C to +85°C, compared to the original part's −55°C to +125°C range. These parts are unsuitable for applications requiring extended low-temperature operation below −40°C or high-temperature operation above +85°C.

Q5: What does RoHS3 compliance mean for part selection?

RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. For regulated industries (medical, automotive, consumer electronics), RoHS3 compliance is mandatory. MC74HCT74ADR2G, MC74HCT74ADG, and 74HCT74D-Q100,118 all carry RoHS3 certification.

Q6: Is the 14-SOIC package identical across all substitute parts?

Yes. All substitute parts use 14-SOIC (0.154", 3.90mm width) surface mount packaging with identical pin configuration and PCB footprint. No layout modifications are required when substituting between listed parts.

Q7: Which substitute offers the best long-term procurement availability?

MC74HCT74ADR2G (onsemi) is recommended for long-term designs. This part is in active production with established supply chains, ROHS3 compliance, and MSL-1 moisture sensitivity rating. Current inventory exceeds 4,600 units, supporting volume production requirements.

Q8: Can I use 74HCT74D-Q100,118 in non-automotive applications?

Yes. The AEC-Q100 automotive qualification is an additional certification that does not restrict use in non-automotive applications. This part is fully compatible with standard industrial and commercial designs and offers the advantage of enhanced reliability documentation.

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