SN74HC74DG4 Equivalent & Substitute Parts

Part Overview

The SN74HC74DG4 is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 14-SOIC surface mount package. This component functions as a Set/Reset flip-flop with complementary outputs, operating across a 2V to 6V supply voltage range with a maximum clock frequency of 60 MHz. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain functional equivalence in D-type flip-flop operation, package compatibility, and electrical performance within specified tolerances.

Key Parameters

Parameter	Value
Part Number	SN74HC74DG4
Manufacturer	Texas Instruments
Function	Set(Preset) and Reset
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	30 ns
Trigger Type	Positive Edge
Voltage Supply Range	2V ~ 6V
Current Output High/Low	5.2 mA / 5.2 mA
Quiescent Current (Iq)	4 µA
Input Capacitance	3 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC74DG4 is determined by the following critical parameters:

Functional Requirements: All substitutes must be dual D-type flip-flops with Set/Reset capability, complementary outputs, and positive edge triggering.

Package Compatibility: All substitutes must use 14-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB footprint compatibility.

Electrical Compatibility: Substitutes must operate within the 2V to 6V supply voltage range and maintain compatible output drive capabilities (5.2 mA minimum for standard operation).

Logic Series: Substitutes belong to the 74HC, 74VHC, or equivalent logic families with compatible timing characteristics.

Compliance Requirements: All substitutes must maintain RoHS3 compliance and MSL Level 1 rating for moisture sensitivity.

Substitutes are grouped into three categories: Direct Replacements (pin-compatible, same performance envelope), Alternative Manufacturers (functionally equivalent from different suppliers), and Performance Upgrades (enhanced specifications with maintained compatibility).

Parameter Comparison

Part Number	Manufacturer	Clock Frequency (MHz)	Max Propagation Delay @ 6V, 50pF (ns)	Voltage Supply (V)	Iq (µA)	Operating Temp (°C)	Product Status
SN74HC74DG4	Texas Instruments	60	30	2 ~ 6	4	-40 ~ 85	Discontinued
SN74HC74DR	Texas Instruments	60	15	2 ~ 6	4	-40 ~ 85	Active
MC74HC74ADR2G	onsemi	35	17	2 ~ 6	2	-55 ~ 125	Active
74HC74D,653	NXP Semiconductors	82	37	2 ~ 6	40	-40 ~ 125	Active
74HC74D-Q100,118	Nexperia USA Inc.	82	37	2 ~ 6	40	-40 ~ 125	Active
74VHC74M	Fairchild Semiconductor	115	9.3	2 ~ 5.5	2	-40 ~ 85	Active
MC74HC74ADG	onsemi	35	17	2 ~ 6	2	-55 ~ 125	Active
MM74HC74AM	Fairchild Semiconductor	94	19	2 ~ 6	4	-40 ~ 85	Active
MM74HC74AMX	Fairchild Semiconductor	94	19	2 ~ 6	4	-40 ~ 85	Active

Engineering Selection Recommendations

Primary Direct Replacement: SN74HC74DR from Texas Instruments is the optimal substitute, offering identical supply voltage range, output drive capability, and operating temperature specifications. This part maintains the same manufacturer lineage and is currently in active production status with superior propagation delay performance (15 ns vs. 30 ns).

Extended Temperature Range Alternative: MC74HC74ADR2G and MC74HC74ADG from onsemi provide extended operating temperature range (-55°C to 125°C) with lower quiescent current (2 µA vs. 4 µA), suitable for applications requiring enhanced thermal performance. Both parts maintain full 2V to 6V supply compatibility.

High-Speed Performance Upgrade: 74VHC74M from Fairchild Semiconductor delivers the fastest propagation delay (9.3 ns) and highest clock frequency (115 MHz) with reduced quiescent current. Note that maximum supply voltage is limited to 5.5V, requiring verification in 6V applications.

Automotive-Grade Option: 74HC74D-Q100,118 from Nexperia USA Inc. includes AEC-Q100 automotive qualification and extended temperature range (-40°C to 125°C), suitable for automotive and harsh environment applications.

RoHS3 Compliance: All recommended substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can SN74HC74DR be used as a direct replacement for SN74HC74DG4?

A: Yes. SN74HC74DR is functionally equivalent with identical pin configuration, package type (14-SOIC), supply voltage range (2V to 6V), output drive capability (5.2 mA), and operating temperature range (-40°C to 85°C). The primary difference is improved propagation delay performance (15 ns vs. 30 ns) and active product status.

Q: What is the difference between MC74HC74ADG and MC74HC74ADR2G?

A: Both parts are from onsemi with identical electrical specifications. MC74HC74ADG is supplied in Tube packaging, while MC74HC74ADR2G is supplied in Cut Tape and Digi-Reel format. Selection depends on packaging and quantity requirements.

Q: Is 74VHC74M compatible with 6V supply applications?

A: No. The 74VHC74M maximum supply voltage is 5.5V, making it unsuitable for applications requiring 6V operation. Verify your circuit's maximum supply voltage before selecting this part.

Q: Why do some substitutes have higher quiescent current?

A: The 74HC74D,653 and 74HC74D-Q100,118 exhibit higher quiescent current (40 µA vs. 4 µA) due to different manufacturing processes and design optimization. This affects power consumption in standby conditions and should be evaluated for battery-powered or low-power applications.

Q: Are all substitutes RoHS3 compliant?

A: All listed substitutes maintain RoHS3 compliance and MSL Level 1 moisture sensitivity rating, meeting modern environmental and manufacturing standards.

Q: What packaging options are available for substitutes?

A: Substitutes are available in Tube, Cut Tape, Digi-Reel, and Tape & Reel formats. Package selection depends on production volume and assembly line requirements. All maintain the same 14-SOIC footprint.

Q: Can I use 74HC74D-Q100,118 in non-automotive applications?

A: Yes. The automotive qualification (AEC-Q100) indicates enhanced reliability and extended temperature range (-40°C to 125°C), making it suitable for any application requiring these specifications, regardless of automotive use.

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