CD74HC74M Equivalent & Substitute Parts

Part Overview

The CD74HC74M is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in 14-SOIC surface mount packaging. This device implements two independent D-type flip-flops with Set (Preset) and Reset functions, complementary outputs, and positive edge triggering. The CD74HC74M is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design and production requirements. Active alternatives from multiple manufacturers provide functional equivalence while maintaining compatibility with existing circuit designs.

Key Parameters

Parameter	CD74HC74M
Manufacturer	Texas Instruments
Series	74HC
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Function	Set (Preset) and Reset
Trigger Type	Positive Edge
Clock Frequency	50 MHz
Max Propagation Delay @ 6V, 50pF	30 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 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 CD74HC74M is determined by strict equivalence across the following critical parameters:

Functional Requirements:

Logic type: D-Type flip-flop with dual elements
Output configuration: Complementary outputs
Control functions: Set (Preset) and Reset capability
Trigger mechanism: Positive edge triggered

Electrical Compatibility:

Supply voltage range: 2V to 6V (all substitutes maintain this range)
Output drive capability: 5.2 mA minimum (all substitutes meet or exceed this)
Package type: 14-SOIC surface mount form factor (identical across all substitutes)

Environmental Specifications:

Operating temperature: Minimum -40°C to maximum 125°C (all substitutes support at least this range)
RoHS3 compliance: Required for all substitutes
MSL rating: 1 (Unlimited) for standard applications

Substitutes are grouped into two categories based on product status: active direct replacements and functionally equivalent alternatives. All listed substitutes maintain identical pinout, package dimensions, and core logic functionality. Variations in clock frequency, propagation delay, quiescent current, and input capacitance do not affect functional substitution within the specified electrical operating envelope.

Parameter Comparison

Part Number	Manufacturer	Series	Clock Freq (MHz)	Max Prop Delay @ 6V, 50pF (ns)	Iq (µA)	Input Cap (pF)	Temp Range (°C)	Status
CD74HC74M	Texas Instruments	74HC	50	30	4	10	-55 to 125	Discontinued
CD74HC74M96	Texas Instruments	74HC	50	30	4	10	-55 to 125	Active
MC74HC74ADR2G	onsemi	74HC	35	17	2	10	-55 to 125	Active
MM74HC74AM	Fairchild Semiconductor	74HC	94	19	4	5	-40 to 85	Active
74HC74D	Toshiba Semiconductor	74HC	67	26	2	5	-40 to 85	Active
74HC74D,653	NXP Semiconductors	74HC	82	37	40	4.6	-40 to 125	Active
74HC74D-Q100,118	Nexperia USA Inc.	74HC	82	37	40	4.6	-40 to 125	Active
74HC74D/AUJ	NXP USA Inc.	74HC	82	37	40	4.6	-40 to 125	Active
74VHC74M	Fairchild Semiconductor	74VHC	115	9.3	2	4	-40 to 85	Active
MC74HC74ADG	onsemi	74HC	35	17	2	10	-55 to 125	Active

Engineering Selection Recommendations

Primary Recommendation: CD74HC74M96

CD74HC74M96 from Texas Instruments is the direct functional equivalent with identical electrical specifications to the discontinued CD74HC74M. This part maintains the same manufacturer lineage, series designation (74HC), and performance characteristics. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit functionality. This substitute is recommended for designs requiring exact performance matching with the original specification.

Secondary Recommendations by Application:

For applications requiring extended temperature range (-55°C to 125°C) with active product status, MC74HC74ADR2G (onsemi) and MC74HC74ADG (onsemi) provide equivalent functionality with improved quiescent current performance (2 µA versus 4 µA). Both parts maintain the 74HC series characteristics and full temperature range compatibility.

For applications where lower propagation delay is beneficial, 74VHC74M (Fairchild Semiconductor) offers superior speed performance (9.3 ns versus 30 ns) with the 74VHC series, though operating temperature range is limited to -40°C to 85°C. This part is suitable for high-speed timing-critical applications within the reduced temperature envelope.

For automotive-grade applications requiring AEC-Q100 qualification, 74HC74D-Q100,118 (Nexperia USA Inc.) provides the necessary certification with active product status.

All recommended substitutes maintain RoHS3 compliance and MSL rating 1 (Unlimited) compatibility with the original CD74HC74M specification.

Frequently Asked Questions (FAQ)

Q: Can CD74HC74M96 be used as a direct replacement for CD74HC74M?

A: Yes. CD74HC74M96 is functionally and electrically equivalent to CD74HC74M. Both are Texas Instruments 74HC series dual D-type flip-flops with identical pin configuration, logic function, and electrical performance. The packaging format difference (Cut Tape & Digi-Reel versus Tube) does not affect circuit operation.

Q: What is the difference between 74HC74 and 74VHC74 series?

A: The 74VHC74M operates at higher clock frequency (115 MHz versus 50 MHz) and exhibits faster propagation delay (9.3 ns versus 30 ns). However, 74VHC74M has a reduced operating temperature range (-40°C to 85°C versus -55°C to 125°C). Select 74VHC74M only for applications where the narrower temperature range is acceptable and higher speed is required.

Q: Are all substitute parts in 14-SOIC packaging?

A: Yes. All listed substitute parts use 14-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring identical PCB footprint and mounting compatibility with the original CD74HC74M design.

Q: What does the quiescent current (Iq) specification mean for substitution?

A: Quiescent current is the supply current drawn when the device is not switching. The CD74HC74M specifies 4 µA. Substitutes with lower Iq (2 µA) consume less standby power and generate less heat. Substitutes with higher Iq (40 µA) consume more power. For battery-powered or low-power applications, select parts with lower Iq ratings. For standard applications, higher Iq does not affect functionality.

Q: Can I use MC74HC74ADR2G in place of CD74HC74M in a -55°C application?

A: Yes. MC74HC74ADR2G supports the full -55°C to 125°C operating temperature range, matching the CD74HC74M specification. This part is suitable for extended temperature range applications.

Q: What does RoHS3 compliance mean?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part does not contain restricted substances including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers. All listed substitutes maintain RoHS3 compliance, ensuring regulatory compatibility with the original specification.

Q: Is propagation delay critical for substitution?

A: Propagation delay affects timing performance but does not prevent functional substitution. The CD74HC74M specifies 30 ns maximum delay. Substitutes with shorter delays (9.3 ns to 26 ns) improve timing margins. Substitutes with longer delays (37 ns) may require timing analysis in delay-sensitive circuits. For most applications, propagation delay variation does not affect circuit operation.

Q: Can I substitute 74HC74D,653 (NXP) for CD74HC74M?

A: Yes, with timing considerations. 74HC74D,653 is functionally equivalent but has higher quiescent current (40 µA versus 4 µA) and longer propagation delay (37 ns versus 30 ns). This part is suitable for applications where these differences do not impact performance. For power-sensitive designs, select lower-Iq alternatives.

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